1 /* Expands front end tree to back end RTL for GNU C-Compiler
2 Copyright (C) 1987, 1988, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
3 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* This file handles the generation of rtl code from tree structure
23 at the level of the function as a whole.
24 It creates the rtl expressions for parameters and auto variables
25 and has full responsibility for allocating stack slots.
27 `expand_function_start' is called at the beginning of a function,
28 before the function body is parsed, and `expand_function_end' is
29 called after parsing the body.
31 Call `assign_stack_local' to allocate a stack slot for a local variable.
32 This is usually done during the RTL generation for the function body,
33 but it can also be done in the reload pass when a pseudo-register does
34 not get a hard register.
36 Call `put_var_into_stack' when you learn, belatedly, that a variable
37 previously given a pseudo-register must in fact go in the stack.
38 This function changes the DECL_RTL to be a stack slot instead of a reg
39 then scans all the RTL instructions so far generated to correct them. */
51 #include "hard-reg-set.h"
52 #include "insn-config.h"
55 #include "basic-block.h"
61 #include "integrate.h"
63 #ifndef TRAMPOLINE_ALIGNMENT
64 #define TRAMPOLINE_ALIGNMENT FUNCTION_BOUNDARY
67 #ifndef LOCAL_ALIGNMENT
68 #define LOCAL_ALIGNMENT(TYPE, ALIGNMENT) ALIGNMENT
71 /* Some systems use __main in a way incompatible with its use in gcc, in these
72 cases use the macros NAME__MAIN to give a quoted symbol and SYMBOL__MAIN to
73 give the same symbol without quotes for an alternative entry point. You
74 must define both, or neither. */
76 #define NAME__MAIN "__main"
77 #define SYMBOL__MAIN __main
80 /* Round a value to the lowest integer less than it that is a multiple of
81 the required alignment. Avoid using division in case the value is
82 negative. Assume the alignment is a power of two. */
83 #define FLOOR_ROUND(VALUE,ALIGN) ((VALUE) & ~((ALIGN) - 1))
85 /* Similar, but round to the next highest integer that meets the
87 #define CEIL_ROUND(VALUE,ALIGN) (((VALUE) + (ALIGN) - 1) & ~((ALIGN)- 1))
89 /* NEED_SEPARATE_AP means that we cannot derive ap from the value of fp
90 during rtl generation. If they are different register numbers, this is
91 always true. It may also be true if
92 FIRST_PARM_OFFSET - STARTING_FRAME_OFFSET is not a constant during rtl
93 generation. See fix_lexical_addr for details. */
95 #if ARG_POINTER_REGNUM != FRAME_POINTER_REGNUM
96 #define NEED_SEPARATE_AP
99 /* Nonzero if function being compiled doesn't contain any calls
100 (ignoring the prologue and epilogue). This is set prior to
101 local register allocation and is valid for the remaining
103 int current_function_is_leaf;
105 /* Nonzero if function being compiled doesn't contain any instructions
106 that can throw an exception. This is set prior to final. */
108 int current_function_nothrow;
110 /* Nonzero if function being compiled doesn't modify the stack pointer
111 (ignoring the prologue and epilogue). This is only valid after
112 life_analysis has run. */
113 int current_function_sp_is_unchanging;
115 /* Nonzero if the function being compiled is a leaf function which only
116 uses leaf registers. This is valid after reload (specifically after
117 sched2) and is useful only if the port defines LEAF_REGISTERS. */
118 int current_function_uses_only_leaf_regs;
120 /* Nonzero once virtual register instantiation has been done.
121 assign_stack_local uses frame_pointer_rtx when this is nonzero.
122 calls.c:emit_library_call_value_1 uses it to set up
123 post-instantiation libcalls. */
124 int virtuals_instantiated;
126 /* These variables hold pointers to functions to create and destroy
127 target specific, per-function data structures. */
128 void (*init_machine_status) PARAMS ((struct function *));
129 void (*free_machine_status) PARAMS ((struct function *));
130 /* This variable holds a pointer to a function to register any
131 data items in the target specific, per-function data structure
132 that will need garbage collection. */
133 void (*mark_machine_status) PARAMS ((struct function *));
135 /* Likewise, but for language-specific data. */
136 void (*init_lang_status) PARAMS ((struct function *));
137 void (*save_lang_status) PARAMS ((struct function *));
138 void (*restore_lang_status) PARAMS ((struct function *));
139 void (*mark_lang_status) PARAMS ((struct function *));
140 void (*free_lang_status) PARAMS ((struct function *));
142 /* The FUNCTION_DECL for an inline function currently being expanded. */
143 tree inline_function_decl;
145 /* The currently compiled function. */
146 struct function *cfun = 0;
148 /* These arrays record the INSN_UIDs of the prologue and epilogue insns. */
149 static varray_type prologue;
150 static varray_type epilogue;
152 /* Array of INSN_UIDs to hold the INSN_UIDs for each sibcall epilogue
154 static varray_type sibcall_epilogue;
156 /* In order to evaluate some expressions, such as function calls returning
157 structures in memory, we need to temporarily allocate stack locations.
158 We record each allocated temporary in the following structure.
160 Associated with each temporary slot is a nesting level. When we pop up
161 one level, all temporaries associated with the previous level are freed.
162 Normally, all temporaries are freed after the execution of the statement
163 in which they were created. However, if we are inside a ({...}) grouping,
164 the result may be in a temporary and hence must be preserved. If the
165 result could be in a temporary, we preserve it if we can determine which
166 one it is in. If we cannot determine which temporary may contain the
167 result, all temporaries are preserved. A temporary is preserved by
168 pretending it was allocated at the previous nesting level.
170 Automatic variables are also assigned temporary slots, at the nesting
171 level where they are defined. They are marked a "kept" so that
172 free_temp_slots will not free them. */
176 /* Points to next temporary slot. */
177 struct temp_slot *next;
178 /* The rtx to used to reference the slot. */
180 /* The rtx used to represent the address if not the address of the
181 slot above. May be an EXPR_LIST if multiple addresses exist. */
183 /* The alignment (in bits) of the slot. */
185 /* The size, in units, of the slot. */
187 /* The type of the object in the slot, or zero if it doesn't correspond
188 to a type. We use this to determine whether a slot can be reused.
189 It can be reused if objects of the type of the new slot will always
190 conflict with objects of the type of the old slot. */
192 /* The value of `sequence_rtl_expr' when this temporary is allocated. */
194 /* Non-zero if this temporary is currently in use. */
196 /* Non-zero if this temporary has its address taken. */
198 /* Nesting level at which this slot is being used. */
200 /* Non-zero if this should survive a call to free_temp_slots. */
202 /* The offset of the slot from the frame_pointer, including extra space
203 for alignment. This info is for combine_temp_slots. */
204 HOST_WIDE_INT base_offset;
205 /* The size of the slot, including extra space for alignment. This
206 info is for combine_temp_slots. */
207 HOST_WIDE_INT full_size;
210 /* This structure is used to record MEMs or pseudos used to replace VAR, any
211 SUBREGs of VAR, and any MEMs containing VAR as an address. We need to
212 maintain this list in case two operands of an insn were required to match;
213 in that case we must ensure we use the same replacement. */
215 struct fixup_replacement
219 struct fixup_replacement *next;
222 struct insns_for_mem_entry
224 /* The KEY in HE will be a MEM. */
225 struct hash_entry he;
226 /* These are the INSNS which reference the MEM. */
230 /* Forward declarations. */
232 static rtx assign_stack_local_1 PARAMS ((enum machine_mode, HOST_WIDE_INT,
233 int, struct function *));
234 static rtx assign_stack_temp_for_type PARAMS ((enum machine_mode,
235 HOST_WIDE_INT, int, tree));
236 static struct temp_slot *find_temp_slot_from_address PARAMS ((rtx));
237 static void put_reg_into_stack PARAMS ((struct function *, rtx, tree,
238 enum machine_mode, enum machine_mode,
239 int, unsigned int, int,
240 struct hash_table *));
241 static void schedule_fixup_var_refs PARAMS ((struct function *, rtx, tree,
243 struct hash_table *));
244 static void fixup_var_refs PARAMS ((rtx, enum machine_mode, int,
245 struct hash_table *));
246 static struct fixup_replacement
247 *find_fixup_replacement PARAMS ((struct fixup_replacement **, rtx));
248 static void fixup_var_refs_insns PARAMS ((rtx, rtx, enum machine_mode,
250 static void fixup_var_refs_insns_with_hash
251 PARAMS ((struct hash_table *, rtx,
252 enum machine_mode, int));
253 static void fixup_var_refs_insn PARAMS ((rtx, rtx, enum machine_mode,
255 static void fixup_var_refs_1 PARAMS ((rtx, enum machine_mode, rtx *, rtx,
256 struct fixup_replacement **));
257 static rtx fixup_memory_subreg PARAMS ((rtx, rtx, int));
258 static rtx walk_fixup_memory_subreg PARAMS ((rtx, rtx, int));
259 static rtx fixup_stack_1 PARAMS ((rtx, rtx));
260 static void optimize_bit_field PARAMS ((rtx, rtx, rtx *));
261 static void instantiate_decls PARAMS ((tree, int));
262 static void instantiate_decls_1 PARAMS ((tree, int));
263 static void instantiate_decl PARAMS ((rtx, HOST_WIDE_INT, int));
264 static rtx instantiate_new_reg PARAMS ((rtx, HOST_WIDE_INT *));
265 static int instantiate_virtual_regs_1 PARAMS ((rtx *, rtx, int));
266 static void delete_handlers PARAMS ((void));
267 static void pad_to_arg_alignment PARAMS ((struct args_size *, int,
268 struct args_size *));
269 #ifndef ARGS_GROW_DOWNWARD
270 static void pad_below PARAMS ((struct args_size *, enum machine_mode,
273 static rtx round_trampoline_addr PARAMS ((rtx));
274 static rtx adjust_trampoline_addr PARAMS ((rtx));
275 static tree *identify_blocks_1 PARAMS ((rtx, tree *, tree *, tree *));
276 static void reorder_blocks_0 PARAMS ((tree));
277 static void reorder_blocks_1 PARAMS ((rtx, tree, varray_type *));
278 static void reorder_fix_fragments PARAMS ((tree));
279 static tree blocks_nreverse PARAMS ((tree));
280 static int all_blocks PARAMS ((tree, tree *));
281 static tree *get_block_vector PARAMS ((tree, int *));
282 /* We always define `record_insns' even if its not used so that we
283 can always export `prologue_epilogue_contains'. */
284 static void record_insns PARAMS ((rtx, varray_type *)) ATTRIBUTE_UNUSED;
285 static int contains PARAMS ((rtx, varray_type));
287 static void emit_return_into_block PARAMS ((basic_block, rtx));
289 static void put_addressof_into_stack PARAMS ((rtx, struct hash_table *));
290 static bool purge_addressof_1 PARAMS ((rtx *, rtx, int, int,
291 struct hash_table *));
292 static void purge_single_hard_subreg_set PARAMS ((rtx));
294 static void keep_stack_depressed PARAMS ((rtx));
296 static int is_addressof PARAMS ((rtx *, void *));
297 static struct hash_entry *insns_for_mem_newfunc PARAMS ((struct hash_entry *,
300 static unsigned long insns_for_mem_hash PARAMS ((hash_table_key));
301 static bool insns_for_mem_comp PARAMS ((hash_table_key, hash_table_key));
302 static int insns_for_mem_walk PARAMS ((rtx *, void *));
303 static void compute_insns_for_mem PARAMS ((rtx, rtx, struct hash_table *));
304 static void mark_function_status PARAMS ((struct function *));
305 static void maybe_mark_struct_function PARAMS ((void *));
306 static void prepare_function_start PARAMS ((void));
307 static void do_clobber_return_reg PARAMS ((rtx, void *));
308 static void do_use_return_reg PARAMS ((rtx, void *));
310 /* Pointer to chain of `struct function' for containing functions. */
311 static struct function *outer_function_chain;
313 /* Given a function decl for a containing function,
314 return the `struct function' for it. */
317 find_function_data (decl)
322 for (p = outer_function_chain; p; p = p->outer)
329 /* Save the current context for compilation of a nested function.
330 This is called from language-specific code. The caller should use
331 the save_lang_status callback to save any language-specific state,
332 since this function knows only about language-independent
336 push_function_context_to (context)
343 if (context == current_function_decl)
344 cfun->contains_functions = 1;
347 struct function *containing = find_function_data (context);
348 containing->contains_functions = 1;
353 init_dummy_function_start ();
356 p->outer = outer_function_chain;
357 outer_function_chain = p;
358 p->fixup_var_refs_queue = 0;
360 if (save_lang_status)
361 (*save_lang_status) (p);
367 push_function_context ()
369 push_function_context_to (current_function_decl);
372 /* Restore the last saved context, at the end of a nested function.
373 This function is called from language-specific code. */
376 pop_function_context_from (context)
377 tree context ATTRIBUTE_UNUSED;
379 struct function *p = outer_function_chain;
380 struct var_refs_queue *queue;
383 outer_function_chain = p->outer;
385 current_function_decl = p->decl;
388 restore_emit_status (p);
389 restore_varasm_status (p);
391 if (restore_lang_status)
392 (*restore_lang_status) (p);
394 /* Finish doing put_var_into_stack for any of our variables
395 which became addressable during the nested function. */
396 for (queue = p->fixup_var_refs_queue; queue; queue = queue->next)
397 fixup_var_refs (queue->modified, queue->promoted_mode,
398 queue->unsignedp, 0);
400 p->fixup_var_refs_queue = 0;
402 /* Reset variables that have known state during rtx generation. */
403 rtx_equal_function_value_matters = 1;
404 virtuals_instantiated = 0;
405 generating_concat_p = 1;
409 pop_function_context ()
411 pop_function_context_from (current_function_decl);
414 /* Clear out all parts of the state in F that can safely be discarded
415 after the function has been parsed, but not compiled, to let
416 garbage collection reclaim the memory. */
419 free_after_parsing (f)
422 /* f->expr->forced_labels is used by code generation. */
423 /* f->emit->regno_reg_rtx is used by code generation. */
424 /* f->varasm is used by code generation. */
425 /* f->eh->eh_return_stub_label is used by code generation. */
427 if (free_lang_status)
428 (*free_lang_status) (f);
429 free_stmt_status (f);
432 /* Clear out all parts of the state in F that can safely be discarded
433 after the function has been compiled, to let garbage collection
434 reclaim the memory. */
437 free_after_compilation (f)
441 free_expr_status (f);
442 free_emit_status (f);
443 free_varasm_status (f);
445 if (free_machine_status)
446 (*free_machine_status) (f);
448 if (f->x_parm_reg_stack_loc)
449 free (f->x_parm_reg_stack_loc);
451 f->x_temp_slots = NULL;
452 f->arg_offset_rtx = NULL;
453 f->return_rtx = NULL;
454 f->internal_arg_pointer = NULL;
455 f->x_nonlocal_labels = NULL;
456 f->x_nonlocal_goto_handler_slots = NULL;
457 f->x_nonlocal_goto_handler_labels = NULL;
458 f->x_nonlocal_goto_stack_level = NULL;
459 f->x_cleanup_label = NULL;
460 f->x_return_label = NULL;
461 f->x_save_expr_regs = NULL;
462 f->x_stack_slot_list = NULL;
463 f->x_rtl_expr_chain = NULL;
464 f->x_tail_recursion_label = NULL;
465 f->x_tail_recursion_reentry = NULL;
466 f->x_arg_pointer_save_area = NULL;
467 f->x_clobber_return_insn = NULL;
468 f->x_context_display = NULL;
469 f->x_trampoline_list = NULL;
470 f->x_parm_birth_insn = NULL;
471 f->x_last_parm_insn = NULL;
472 f->x_parm_reg_stack_loc = NULL;
473 f->fixup_var_refs_queue = NULL;
474 f->original_arg_vector = NULL;
475 f->original_decl_initial = NULL;
476 f->inl_last_parm_insn = NULL;
477 f->epilogue_delay_list = NULL;
480 /* Allocate fixed slots in the stack frame of the current function. */
482 /* Return size needed for stack frame based on slots so far allocated in
484 This size counts from zero. It is not rounded to PREFERRED_STACK_BOUNDARY;
485 the caller may have to do that. */
488 get_func_frame_size (f)
491 #ifdef FRAME_GROWS_DOWNWARD
492 return -f->x_frame_offset;
494 return f->x_frame_offset;
498 /* Return size needed for stack frame based on slots so far allocated.
499 This size counts from zero. It is not rounded to PREFERRED_STACK_BOUNDARY;
500 the caller may have to do that. */
504 return get_func_frame_size (cfun);
507 /* Allocate a stack slot of SIZE bytes and return a MEM rtx for it
508 with machine mode MODE.
510 ALIGN controls the amount of alignment for the address of the slot:
511 0 means according to MODE,
512 -1 means use BIGGEST_ALIGNMENT and round size to multiple of that,
513 positive specifies alignment boundary in bits.
515 We do not round to stack_boundary here.
517 FUNCTION specifies the function to allocate in. */
520 assign_stack_local_1 (mode, size, align, function)
521 enum machine_mode mode;
524 struct function *function;
527 int bigend_correction = 0;
535 alignment = BIGGEST_ALIGNMENT;
537 alignment = GET_MODE_ALIGNMENT (mode);
539 /* Allow the target to (possibly) increase the alignment of this
541 type = type_for_mode (mode, 0);
543 alignment = LOCAL_ALIGNMENT (type, alignment);
545 alignment /= BITS_PER_UNIT;
547 else if (align == -1)
549 alignment = BIGGEST_ALIGNMENT / BITS_PER_UNIT;
550 size = CEIL_ROUND (size, alignment);
553 alignment = align / BITS_PER_UNIT;
555 #ifdef FRAME_GROWS_DOWNWARD
556 function->x_frame_offset -= size;
559 /* Ignore alignment we can't do with expected alignment of the boundary. */
560 if (alignment * BITS_PER_UNIT > PREFERRED_STACK_BOUNDARY)
561 alignment = PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT;
563 if (function->stack_alignment_needed < alignment * BITS_PER_UNIT)
564 function->stack_alignment_needed = alignment * BITS_PER_UNIT;
566 /* Round frame offset to that alignment.
567 We must be careful here, since FRAME_OFFSET might be negative and
568 division with a negative dividend isn't as well defined as we might
569 like. So we instead assume that ALIGNMENT is a power of two and
570 use logical operations which are unambiguous. */
571 #ifdef FRAME_GROWS_DOWNWARD
572 function->x_frame_offset = FLOOR_ROUND (function->x_frame_offset, alignment);
574 function->x_frame_offset = CEIL_ROUND (function->x_frame_offset, alignment);
577 /* On a big-endian machine, if we are allocating more space than we will use,
578 use the least significant bytes of those that are allocated. */
579 if (BYTES_BIG_ENDIAN && mode != BLKmode)
580 bigend_correction = size - GET_MODE_SIZE (mode);
582 /* If we have already instantiated virtual registers, return the actual
583 address relative to the frame pointer. */
584 if (function == cfun && virtuals_instantiated)
585 addr = plus_constant (frame_pointer_rtx,
586 (frame_offset + bigend_correction
587 + STARTING_FRAME_OFFSET));
589 addr = plus_constant (virtual_stack_vars_rtx,
590 function->x_frame_offset + bigend_correction);
592 #ifndef FRAME_GROWS_DOWNWARD
593 function->x_frame_offset += size;
596 x = gen_rtx_MEM (mode, addr);
598 function->x_stack_slot_list
599 = gen_rtx_EXPR_LIST (VOIDmode, x, function->x_stack_slot_list);
604 /* Wrapper around assign_stack_local_1; assign a local stack slot for the
608 assign_stack_local (mode, size, align)
609 enum machine_mode mode;
613 return assign_stack_local_1 (mode, size, align, cfun);
616 /* Allocate a temporary stack slot and record it for possible later
619 MODE is the machine mode to be given to the returned rtx.
621 SIZE is the size in units of the space required. We do no rounding here
622 since assign_stack_local will do any required rounding.
624 KEEP is 1 if this slot is to be retained after a call to
625 free_temp_slots. Automatic variables for a block are allocated
626 with this flag. KEEP is 2 if we allocate a longer term temporary,
627 whose lifetime is controlled by CLEANUP_POINT_EXPRs. KEEP is 3
628 if we are to allocate something at an inner level to be treated as
629 a variable in the block (e.g., a SAVE_EXPR).
631 TYPE is the type that will be used for the stack slot. */
634 assign_stack_temp_for_type (mode, size, keep, type)
635 enum machine_mode mode;
641 struct temp_slot *p, *best_p = 0;
643 /* If SIZE is -1 it means that somebody tried to allocate a temporary
644 of a variable size. */
649 align = BIGGEST_ALIGNMENT;
651 align = GET_MODE_ALIGNMENT (mode);
654 type = type_for_mode (mode, 0);
657 align = LOCAL_ALIGNMENT (type, align);
659 /* Try to find an available, already-allocated temporary of the proper
660 mode which meets the size and alignment requirements. Choose the
661 smallest one with the closest alignment. */
662 for (p = temp_slots; p; p = p->next)
663 if (p->align >= align && p->size >= size && GET_MODE (p->slot) == mode
665 && objects_must_conflict_p (p->type, type)
666 && (best_p == 0 || best_p->size > p->size
667 || (best_p->size == p->size && best_p->align > p->align)))
669 if (p->align == align && p->size == size)
677 /* Make our best, if any, the one to use. */
680 /* If there are enough aligned bytes left over, make them into a new
681 temp_slot so that the extra bytes don't get wasted. Do this only
682 for BLKmode slots, so that we can be sure of the alignment. */
683 if (GET_MODE (best_p->slot) == BLKmode)
685 int alignment = best_p->align / BITS_PER_UNIT;
686 HOST_WIDE_INT rounded_size = CEIL_ROUND (size, alignment);
688 if (best_p->size - rounded_size >= alignment)
690 p = (struct temp_slot *) ggc_alloc (sizeof (struct temp_slot));
691 p->in_use = p->addr_taken = 0;
692 p->size = best_p->size - rounded_size;
693 p->base_offset = best_p->base_offset + rounded_size;
694 p->full_size = best_p->full_size - rounded_size;
695 p->slot = gen_rtx_MEM (BLKmode,
696 plus_constant (XEXP (best_p->slot, 0),
698 p->align = best_p->align;
701 p->type = best_p->type;
702 p->next = temp_slots;
705 stack_slot_list = gen_rtx_EXPR_LIST (VOIDmode, p->slot,
708 best_p->size = rounded_size;
709 best_p->full_size = rounded_size;
716 /* If we still didn't find one, make a new temporary. */
719 HOST_WIDE_INT frame_offset_old = frame_offset;
721 p = (struct temp_slot *) ggc_alloc (sizeof (struct temp_slot));
723 /* We are passing an explicit alignment request to assign_stack_local.
724 One side effect of that is assign_stack_local will not round SIZE
725 to ensure the frame offset remains suitably aligned.
727 So for requests which depended on the rounding of SIZE, we go ahead
728 and round it now. We also make sure ALIGNMENT is at least
729 BIGGEST_ALIGNMENT. */
730 if (mode == BLKmode && align < BIGGEST_ALIGNMENT)
732 p->slot = assign_stack_local (mode,
734 ? CEIL_ROUND (size, align / BITS_PER_UNIT)
740 /* The following slot size computation is necessary because we don't
741 know the actual size of the temporary slot until assign_stack_local
742 has performed all the frame alignment and size rounding for the
743 requested temporary. Note that extra space added for alignment
744 can be either above or below this stack slot depending on which
745 way the frame grows. We include the extra space if and only if it
746 is above this slot. */
747 #ifdef FRAME_GROWS_DOWNWARD
748 p->size = frame_offset_old - frame_offset;
753 /* Now define the fields used by combine_temp_slots. */
754 #ifdef FRAME_GROWS_DOWNWARD
755 p->base_offset = frame_offset;
756 p->full_size = frame_offset_old - frame_offset;
758 p->base_offset = frame_offset_old;
759 p->full_size = frame_offset - frame_offset_old;
762 p->next = temp_slots;
768 p->rtl_expr = seq_rtl_expr;
773 p->level = target_temp_slot_level;
778 p->level = var_temp_slot_level;
783 p->level = temp_slot_level;
787 /* We may be reusing an old slot, so clear any MEM flags that may have been
789 RTX_UNCHANGING_P (p->slot) = 0;
790 MEM_IN_STRUCT_P (p->slot) = 0;
791 MEM_SCALAR_P (p->slot) = 0;
792 MEM_VOLATILE_P (p->slot) = 0;
794 /* If we know the alias set for the memory that will be used, use
795 it. If there's no TYPE, then we don't know anything about the
796 alias set for the memory. */
797 set_mem_alias_set (p->slot, type ? get_alias_set (type) : 0);
798 set_mem_align (p->slot, align);
800 /* If a type is specified, set the relevant flags. */
803 RTX_UNCHANGING_P (p->slot) = TYPE_READONLY (type);
804 MEM_VOLATILE_P (p->slot) = TYPE_VOLATILE (type);
805 MEM_SET_IN_STRUCT_P (p->slot, AGGREGATE_TYPE_P (type));
811 /* Allocate a temporary stack slot and record it for possible later
812 reuse. First three arguments are same as in preceding function. */
815 assign_stack_temp (mode, size, keep)
816 enum machine_mode mode;
820 return assign_stack_temp_for_type (mode, size, keep, NULL_TREE);
823 /* Assign a temporary of given TYPE.
824 KEEP is as for assign_stack_temp.
825 MEMORY_REQUIRED is 1 if the result must be addressable stack memory;
826 it is 0 if a register is OK.
827 DONT_PROMOTE is 1 if we should not promote values in register
831 assign_temp (type, keep, memory_required, dont_promote)
835 int dont_promote ATTRIBUTE_UNUSED;
837 enum machine_mode mode = TYPE_MODE (type);
838 #ifndef PROMOTE_FOR_CALL_ONLY
839 int unsignedp = TREE_UNSIGNED (type);
842 if (mode == BLKmode || memory_required)
844 HOST_WIDE_INT size = int_size_in_bytes (type);
847 /* Zero sized arrays are GNU C extension. Set size to 1 to avoid
848 problems with allocating the stack space. */
852 /* Unfortunately, we don't yet know how to allocate variable-sized
853 temporaries. However, sometimes we have a fixed upper limit on
854 the size (which is stored in TYPE_ARRAY_MAX_SIZE) and can use that
855 instead. This is the case for Chill variable-sized strings. */
856 if (size == -1 && TREE_CODE (type) == ARRAY_TYPE
857 && TYPE_ARRAY_MAX_SIZE (type) != NULL_TREE
858 && host_integerp (TYPE_ARRAY_MAX_SIZE (type), 1))
859 size = tree_low_cst (TYPE_ARRAY_MAX_SIZE (type), 1);
861 tmp = assign_stack_temp_for_type (mode, size, keep, type);
865 #ifndef PROMOTE_FOR_CALL_ONLY
867 mode = promote_mode (type, mode, &unsignedp, 0);
870 return gen_reg_rtx (mode);
873 /* Combine temporary stack slots which are adjacent on the stack.
875 This allows for better use of already allocated stack space. This is only
876 done for BLKmode slots because we can be sure that we won't have alignment
877 problems in this case. */
880 combine_temp_slots ()
882 struct temp_slot *p, *q;
883 struct temp_slot *prev_p, *prev_q;
886 /* We can't combine slots, because the information about which slot
887 is in which alias set will be lost. */
888 if (flag_strict_aliasing)
891 /* If there are a lot of temp slots, don't do anything unless
892 high levels of optimizaton. */
893 if (! flag_expensive_optimizations)
894 for (p = temp_slots, num_slots = 0; p; p = p->next, num_slots++)
895 if (num_slots > 100 || (num_slots > 10 && optimize == 0))
898 for (p = temp_slots, prev_p = 0; p; p = prev_p ? prev_p->next : temp_slots)
902 if (! p->in_use && GET_MODE (p->slot) == BLKmode)
903 for (q = p->next, prev_q = p; q; q = prev_q->next)
906 if (! q->in_use && GET_MODE (q->slot) == BLKmode)
908 if (p->base_offset + p->full_size == q->base_offset)
910 /* Q comes after P; combine Q into P. */
912 p->full_size += q->full_size;
915 else if (q->base_offset + q->full_size == p->base_offset)
917 /* P comes after Q; combine P into Q. */
919 q->full_size += p->full_size;
924 /* Either delete Q or advance past it. */
926 prev_q->next = q->next;
930 /* Either delete P or advance past it. */
934 prev_p->next = p->next;
936 temp_slots = p->next;
943 /* Find the temp slot corresponding to the object at address X. */
945 static struct temp_slot *
946 find_temp_slot_from_address (x)
952 for (p = temp_slots; p; p = p->next)
957 else if (XEXP (p->slot, 0) == x
959 || (GET_CODE (x) == PLUS
960 && XEXP (x, 0) == virtual_stack_vars_rtx
961 && GET_CODE (XEXP (x, 1)) == CONST_INT
962 && INTVAL (XEXP (x, 1)) >= p->base_offset
963 && INTVAL (XEXP (x, 1)) < p->base_offset + p->full_size))
966 else if (p->address != 0 && GET_CODE (p->address) == EXPR_LIST)
967 for (next = p->address; next; next = XEXP (next, 1))
968 if (XEXP (next, 0) == x)
972 /* If we have a sum involving a register, see if it points to a temp
974 if (GET_CODE (x) == PLUS && GET_CODE (XEXP (x, 0)) == REG
975 && (p = find_temp_slot_from_address (XEXP (x, 0))) != 0)
977 else if (GET_CODE (x) == PLUS && GET_CODE (XEXP (x, 1)) == REG
978 && (p = find_temp_slot_from_address (XEXP (x, 1))) != 0)
984 /* Indicate that NEW is an alternate way of referring to the temp slot
985 that previously was known by OLD. */
988 update_temp_slot_address (old, new)
993 if (rtx_equal_p (old, new))
996 p = find_temp_slot_from_address (old);
998 /* If we didn't find one, see if both OLD is a PLUS. If so, and NEW
999 is a register, see if one operand of the PLUS is a temporary
1000 location. If so, NEW points into it. Otherwise, if both OLD and
1001 NEW are a PLUS and if there is a register in common between them.
1002 If so, try a recursive call on those values. */
1005 if (GET_CODE (old) != PLUS)
1008 if (GET_CODE (new) == REG)
1010 update_temp_slot_address (XEXP (old, 0), new);
1011 update_temp_slot_address (XEXP (old, 1), new);
1014 else if (GET_CODE (new) != PLUS)
1017 if (rtx_equal_p (XEXP (old, 0), XEXP (new, 0)))
1018 update_temp_slot_address (XEXP (old, 1), XEXP (new, 1));
1019 else if (rtx_equal_p (XEXP (old, 1), XEXP (new, 0)))
1020 update_temp_slot_address (XEXP (old, 0), XEXP (new, 1));
1021 else if (rtx_equal_p (XEXP (old, 0), XEXP (new, 1)))
1022 update_temp_slot_address (XEXP (old, 1), XEXP (new, 0));
1023 else if (rtx_equal_p (XEXP (old, 1), XEXP (new, 1)))
1024 update_temp_slot_address (XEXP (old, 0), XEXP (new, 0));
1029 /* Otherwise add an alias for the temp's address. */
1030 else if (p->address == 0)
1034 if (GET_CODE (p->address) != EXPR_LIST)
1035 p->address = gen_rtx_EXPR_LIST (VOIDmode, p->address, NULL_RTX);
1037 p->address = gen_rtx_EXPR_LIST (VOIDmode, new, p->address);
1041 /* If X could be a reference to a temporary slot, mark the fact that its
1042 address was taken. */
1045 mark_temp_addr_taken (x)
1048 struct temp_slot *p;
1053 /* If X is not in memory or is at a constant address, it cannot be in
1054 a temporary slot. */
1055 if (GET_CODE (x) != MEM || CONSTANT_P (XEXP (x, 0)))
1058 p = find_temp_slot_from_address (XEXP (x, 0));
1063 /* If X could be a reference to a temporary slot, mark that slot as
1064 belonging to the to one level higher than the current level. If X
1065 matched one of our slots, just mark that one. Otherwise, we can't
1066 easily predict which it is, so upgrade all of them. Kept slots
1067 need not be touched.
1069 This is called when an ({...}) construct occurs and a statement
1070 returns a value in memory. */
1073 preserve_temp_slots (x)
1076 struct temp_slot *p = 0;
1078 /* If there is no result, we still might have some objects whose address
1079 were taken, so we need to make sure they stay around. */
1082 for (p = temp_slots; p; p = p->next)
1083 if (p->in_use && p->level == temp_slot_level && p->addr_taken)
1089 /* If X is a register that is being used as a pointer, see if we have
1090 a temporary slot we know it points to. To be consistent with
1091 the code below, we really should preserve all non-kept slots
1092 if we can't find a match, but that seems to be much too costly. */
1093 if (GET_CODE (x) == REG && REG_POINTER (x))
1094 p = find_temp_slot_from_address (x);
1096 /* If X is not in memory or is at a constant address, it cannot be in
1097 a temporary slot, but it can contain something whose address was
1099 if (p == 0 && (GET_CODE (x) != MEM || CONSTANT_P (XEXP (x, 0))))
1101 for (p = temp_slots; p; p = p->next)
1102 if (p->in_use && p->level == temp_slot_level && p->addr_taken)
1108 /* First see if we can find a match. */
1110 p = find_temp_slot_from_address (XEXP (x, 0));
1114 /* Move everything at our level whose address was taken to our new
1115 level in case we used its address. */
1116 struct temp_slot *q;
1118 if (p->level == temp_slot_level)
1120 for (q = temp_slots; q; q = q->next)
1121 if (q != p && q->addr_taken && q->level == p->level)
1130 /* Otherwise, preserve all non-kept slots at this level. */
1131 for (p = temp_slots; p; p = p->next)
1132 if (p->in_use && p->level == temp_slot_level && ! p->keep)
1136 /* X is the result of an RTL_EXPR. If it is a temporary slot associated
1137 with that RTL_EXPR, promote it into a temporary slot at the present
1138 level so it will not be freed when we free slots made in the
1142 preserve_rtl_expr_result (x)
1145 struct temp_slot *p;
1147 /* If X is not in memory or is at a constant address, it cannot be in
1148 a temporary slot. */
1149 if (x == 0 || GET_CODE (x) != MEM || CONSTANT_P (XEXP (x, 0)))
1152 /* If we can find a match, move it to our level unless it is already at
1154 p = find_temp_slot_from_address (XEXP (x, 0));
1157 p->level = MIN (p->level, temp_slot_level);
1164 /* Free all temporaries used so far. This is normally called at the end
1165 of generating code for a statement. Don't free any temporaries
1166 currently in use for an RTL_EXPR that hasn't yet been emitted.
1167 We could eventually do better than this since it can be reused while
1168 generating the same RTL_EXPR, but this is complex and probably not
1174 struct temp_slot *p;
1176 for (p = temp_slots; p; p = p->next)
1177 if (p->in_use && p->level == temp_slot_level && ! p->keep
1178 && p->rtl_expr == 0)
1181 combine_temp_slots ();
1184 /* Free all temporary slots used in T, an RTL_EXPR node. */
1187 free_temps_for_rtl_expr (t)
1190 struct temp_slot *p;
1192 for (p = temp_slots; p; p = p->next)
1193 if (p->rtl_expr == t)
1195 /* If this slot is below the current TEMP_SLOT_LEVEL, then it
1196 needs to be preserved. This can happen if a temporary in
1197 the RTL_EXPR was addressed; preserve_temp_slots will move
1198 the temporary into a higher level. */
1199 if (temp_slot_level <= p->level)
1202 p->rtl_expr = NULL_TREE;
1205 combine_temp_slots ();
1208 /* Mark all temporaries ever allocated in this function as not suitable
1209 for reuse until the current level is exited. */
1212 mark_all_temps_used ()
1214 struct temp_slot *p;
1216 for (p = temp_slots; p; p = p->next)
1218 p->in_use = p->keep = 1;
1219 p->level = MIN (p->level, temp_slot_level);
1223 /* Push deeper into the nesting level for stack temporaries. */
1231 /* Likewise, but save the new level as the place to allocate variables
1236 push_temp_slots_for_block ()
1240 var_temp_slot_level = temp_slot_level;
1243 /* Likewise, but save the new level as the place to allocate temporaries
1244 for TARGET_EXPRs. */
1247 push_temp_slots_for_target ()
1251 target_temp_slot_level = temp_slot_level;
1254 /* Set and get the value of target_temp_slot_level. The only
1255 permitted use of these functions is to save and restore this value. */
1258 get_target_temp_slot_level ()
1260 return target_temp_slot_level;
1264 set_target_temp_slot_level (level)
1267 target_temp_slot_level = level;
1271 /* Pop a temporary nesting level. All slots in use in the current level
1277 struct temp_slot *p;
1279 for (p = temp_slots; p; p = p->next)
1280 if (p->in_use && p->level == temp_slot_level && p->rtl_expr == 0)
1283 combine_temp_slots ();
1288 /* Initialize temporary slots. */
1293 /* We have not allocated any temporaries yet. */
1295 temp_slot_level = 0;
1296 var_temp_slot_level = 0;
1297 target_temp_slot_level = 0;
1300 /* Retroactively move an auto variable from a register to a stack slot.
1301 This is done when an address-reference to the variable is seen. */
1304 put_var_into_stack (decl)
1308 enum machine_mode promoted_mode, decl_mode;
1309 struct function *function = 0;
1311 int can_use_addressof;
1312 int volatilep = TREE_CODE (decl) != SAVE_EXPR && TREE_THIS_VOLATILE (decl);
1313 int usedp = (TREE_USED (decl)
1314 || (TREE_CODE (decl) != SAVE_EXPR && DECL_INITIAL (decl) != 0));
1316 context = decl_function_context (decl);
1318 /* Get the current rtl used for this object and its original mode. */
1319 reg = (TREE_CODE (decl) == SAVE_EXPR
1320 ? SAVE_EXPR_RTL (decl)
1321 : DECL_RTL_IF_SET (decl));
1323 /* No need to do anything if decl has no rtx yet
1324 since in that case caller is setting TREE_ADDRESSABLE
1325 and a stack slot will be assigned when the rtl is made. */
1329 /* Get the declared mode for this object. */
1330 decl_mode = (TREE_CODE (decl) == SAVE_EXPR ? TYPE_MODE (TREE_TYPE (decl))
1331 : DECL_MODE (decl));
1332 /* Get the mode it's actually stored in. */
1333 promoted_mode = GET_MODE (reg);
1335 /* If this variable comes from an outer function, find that
1336 function's saved context. Don't use find_function_data here,
1337 because it might not be in any active function.
1338 FIXME: Is that really supposed to happen?
1339 It does in ObjC at least. */
1340 if (context != current_function_decl && context != inline_function_decl)
1341 for (function = outer_function_chain; function; function = function->outer)
1342 if (function->decl == context)
1345 /* If this is a variable-size object with a pseudo to address it,
1346 put that pseudo into the stack, if the var is nonlocal. */
1347 if (TREE_CODE (decl) != SAVE_EXPR && DECL_NONLOCAL (decl)
1348 && GET_CODE (reg) == MEM
1349 && GET_CODE (XEXP (reg, 0)) == REG
1350 && REGNO (XEXP (reg, 0)) > LAST_VIRTUAL_REGISTER)
1352 reg = XEXP (reg, 0);
1353 decl_mode = promoted_mode = GET_MODE (reg);
1359 /* FIXME make it work for promoted modes too */
1360 && decl_mode == promoted_mode
1361 #ifdef NON_SAVING_SETJMP
1362 && ! (NON_SAVING_SETJMP && current_function_calls_setjmp)
1366 /* If we can't use ADDRESSOF, make sure we see through one we already
1368 if (! can_use_addressof && GET_CODE (reg) == MEM
1369 && GET_CODE (XEXP (reg, 0)) == ADDRESSOF)
1370 reg = XEXP (XEXP (reg, 0), 0);
1372 /* Now we should have a value that resides in one or more pseudo regs. */
1374 if (GET_CODE (reg) == REG)
1376 /* If this variable lives in the current function and we don't need
1377 to put things in the stack for the sake of setjmp, try to keep it
1378 in a register until we know we actually need the address. */
1379 if (can_use_addressof)
1380 gen_mem_addressof (reg, decl);
1382 put_reg_into_stack (function, reg, TREE_TYPE (decl), promoted_mode,
1383 decl_mode, volatilep, 0, usedp, 0);
1385 else if (GET_CODE (reg) == CONCAT)
1387 /* A CONCAT contains two pseudos; put them both in the stack.
1388 We do it so they end up consecutive.
1389 We fixup references to the parts only after we fixup references
1390 to the whole CONCAT, lest we do double fixups for the latter
1392 enum machine_mode part_mode = GET_MODE (XEXP (reg, 0));
1393 tree part_type = type_for_mode (part_mode, 0);
1394 rtx lopart = XEXP (reg, 0);
1395 rtx hipart = XEXP (reg, 1);
1396 #ifdef FRAME_GROWS_DOWNWARD
1397 /* Since part 0 should have a lower address, do it second. */
1398 put_reg_into_stack (function, hipart, part_type, part_mode,
1399 part_mode, volatilep, 0, 0, 0);
1400 put_reg_into_stack (function, lopart, part_type, part_mode,
1401 part_mode, volatilep, 0, 0, 0);
1403 put_reg_into_stack (function, lopart, part_type, part_mode,
1404 part_mode, volatilep, 0, 0, 0);
1405 put_reg_into_stack (function, hipart, part_type, part_mode,
1406 part_mode, volatilep, 0, 0, 0);
1409 /* Change the CONCAT into a combined MEM for both parts. */
1410 PUT_CODE (reg, MEM);
1411 MEM_ATTRS (reg) = 0;
1413 /* set_mem_attributes uses DECL_RTL to avoid re-generating of
1414 already computed alias sets. Here we want to re-generate. */
1416 SET_DECL_RTL (decl, NULL);
1417 set_mem_attributes (reg, decl, 1);
1419 SET_DECL_RTL (decl, reg);
1421 /* The two parts are in memory order already.
1422 Use the lower parts address as ours. */
1423 XEXP (reg, 0) = XEXP (XEXP (reg, 0), 0);
1424 /* Prevent sharing of rtl that might lose. */
1425 if (GET_CODE (XEXP (reg, 0)) == PLUS)
1426 XEXP (reg, 0) = copy_rtx (XEXP (reg, 0));
1429 schedule_fixup_var_refs (function, reg, TREE_TYPE (decl),
1431 schedule_fixup_var_refs (function, lopart, part_type, part_mode, 0);
1432 schedule_fixup_var_refs (function, hipart, part_type, part_mode, 0);
1438 if (current_function_check_memory_usage)
1439 emit_library_call (chkr_set_right_libfunc, LCT_CONST_MAKE_BLOCK, VOIDmode,
1440 3, XEXP (reg, 0), Pmode,
1441 GEN_INT (GET_MODE_SIZE (GET_MODE (reg))),
1442 TYPE_MODE (sizetype),
1443 GEN_INT (MEMORY_USE_RW),
1444 TYPE_MODE (integer_type_node));
1447 /* Subroutine of put_var_into_stack. This puts a single pseudo reg REG
1448 into the stack frame of FUNCTION (0 means the current function).
1449 DECL_MODE is the machine mode of the user-level data type.
1450 PROMOTED_MODE is the machine mode of the register.
1451 VOLATILE_P is nonzero if this is for a "volatile" decl.
1452 USED_P is nonzero if this reg might have already been used in an insn. */
1455 put_reg_into_stack (function, reg, type, promoted_mode, decl_mode, volatile_p,
1456 original_regno, used_p, ht)
1457 struct function *function;
1460 enum machine_mode promoted_mode, decl_mode;
1462 unsigned int original_regno;
1464 struct hash_table *ht;
1466 struct function *func = function ? function : cfun;
1468 unsigned int regno = original_regno;
1471 regno = REGNO (reg);
1473 if (regno < func->x_max_parm_reg)
1474 new = func->x_parm_reg_stack_loc[regno];
1477 new = assign_stack_local_1 (decl_mode, GET_MODE_SIZE (decl_mode), 0, func);
1479 PUT_CODE (reg, MEM);
1480 PUT_MODE (reg, decl_mode);
1481 XEXP (reg, 0) = XEXP (new, 0);
1482 MEM_ATTRS (reg) = 0;
1483 /* `volatil' bit means one thing for MEMs, another entirely for REGs. */
1484 MEM_VOLATILE_P (reg) = volatile_p;
1486 /* If this is a memory ref that contains aggregate components,
1487 mark it as such for cse and loop optimize. If we are reusing a
1488 previously generated stack slot, then we need to copy the bit in
1489 case it was set for other reasons. For instance, it is set for
1490 __builtin_va_alist. */
1493 MEM_SET_IN_STRUCT_P (reg,
1494 AGGREGATE_TYPE_P (type) || MEM_IN_STRUCT_P (new));
1495 set_mem_alias_set (reg, get_alias_set (type));
1499 schedule_fixup_var_refs (function, reg, type, promoted_mode, ht);
1502 /* Make sure that all refs to the variable, previously made
1503 when it was a register, are fixed up to be valid again.
1504 See function above for meaning of arguments. */
1507 schedule_fixup_var_refs (function, reg, type, promoted_mode, ht)
1508 struct function *function;
1511 enum machine_mode promoted_mode;
1512 struct hash_table *ht;
1514 int unsigned_p = type ? TREE_UNSIGNED (type) : 0;
1518 struct var_refs_queue *temp;
1521 = (struct var_refs_queue *) ggc_alloc (sizeof (struct var_refs_queue));
1522 temp->modified = reg;
1523 temp->promoted_mode = promoted_mode;
1524 temp->unsignedp = unsigned_p;
1525 temp->next = function->fixup_var_refs_queue;
1526 function->fixup_var_refs_queue = temp;
1529 /* Variable is local; fix it up now. */
1530 fixup_var_refs (reg, promoted_mode, unsigned_p, ht);
1534 fixup_var_refs (var, promoted_mode, unsignedp, ht)
1536 enum machine_mode promoted_mode;
1538 struct hash_table *ht;
1541 rtx first_insn = get_insns ();
1542 struct sequence_stack *stack = seq_stack;
1543 tree rtl_exps = rtl_expr_chain;
1545 /* If there's a hash table, it must record all uses of VAR. */
1550 fixup_var_refs_insns_with_hash (ht, var, promoted_mode, unsignedp);
1554 fixup_var_refs_insns (first_insn, var, promoted_mode, unsignedp,
1557 /* Scan all pending sequences too. */
1558 for (; stack; stack = stack->next)
1560 push_to_full_sequence (stack->first, stack->last);
1561 fixup_var_refs_insns (stack->first, var, promoted_mode, unsignedp,
1563 /* Update remembered end of sequence
1564 in case we added an insn at the end. */
1565 stack->last = get_last_insn ();
1569 /* Scan all waiting RTL_EXPRs too. */
1570 for (pending = rtl_exps; pending; pending = TREE_CHAIN (pending))
1572 rtx seq = RTL_EXPR_SEQUENCE (TREE_VALUE (pending));
1573 if (seq != const0_rtx && seq != 0)
1575 push_to_sequence (seq);
1576 fixup_var_refs_insns (seq, var, promoted_mode, unsignedp, 0);
1582 /* REPLACEMENTS is a pointer to a list of the struct fixup_replacement and X is
1583 some part of an insn. Return a struct fixup_replacement whose OLD
1584 value is equal to X. Allocate a new structure if no such entry exists. */
1586 static struct fixup_replacement *
1587 find_fixup_replacement (replacements, x)
1588 struct fixup_replacement **replacements;
1591 struct fixup_replacement *p;
1593 /* See if we have already replaced this. */
1594 for (p = *replacements; p != 0 && ! rtx_equal_p (p->old, x); p = p->next)
1599 p = (struct fixup_replacement *) xmalloc (sizeof (struct fixup_replacement));
1602 p->next = *replacements;
1609 /* Scan the insn-chain starting with INSN for refs to VAR
1610 and fix them up. TOPLEVEL is nonzero if this chain is the
1611 main chain of insns for the current function. */
1614 fixup_var_refs_insns (insn, var, promoted_mode, unsignedp, toplevel)
1617 enum machine_mode promoted_mode;
1623 /* fixup_var_refs_insn might modify insn, so save its next
1625 rtx next = NEXT_INSN (insn);
1627 /* CALL_PLACEHOLDERs are special; we have to switch into each of
1628 the three sequences they (potentially) contain, and process
1629 them recursively. The CALL_INSN itself is not interesting. */
1631 if (GET_CODE (insn) == CALL_INSN
1632 && GET_CODE (PATTERN (insn)) == CALL_PLACEHOLDER)
1636 /* Look at the Normal call, sibling call and tail recursion
1637 sequences attached to the CALL_PLACEHOLDER. */
1638 for (i = 0; i < 3; i++)
1640 rtx seq = XEXP (PATTERN (insn), i);
1643 push_to_sequence (seq);
1644 fixup_var_refs_insns (seq, var, promoted_mode, unsignedp, 0);
1645 XEXP (PATTERN (insn), i) = get_insns ();
1651 else if (INSN_P (insn))
1652 fixup_var_refs_insn (insn, var, promoted_mode, unsignedp, toplevel);
1658 /* Look up the insns which reference VAR in HT and fix them up. Other
1659 arguments are the same as fixup_var_refs_insns.
1661 N.B. No need for special processing of CALL_PLACEHOLDERs here,
1662 because the hash table will point straight to the interesting insn
1663 (inside the CALL_PLACEHOLDER). */
1666 fixup_var_refs_insns_with_hash (ht, var, promoted_mode, unsignedp)
1667 struct hash_table *ht;
1669 enum machine_mode promoted_mode;
1672 struct insns_for_mem_entry *ime = (struct insns_for_mem_entry *)
1673 hash_lookup (ht, var, /*create=*/0, /*copy=*/0);
1674 rtx insn_list = ime->insns;
1678 rtx insn = XEXP (insn_list, 0);
1681 fixup_var_refs_insn (insn, var, promoted_mode, unsignedp, 1);
1683 insn_list = XEXP (insn_list, 1);
1688 /* Per-insn processing by fixup_var_refs_insns(_with_hash). INSN is
1689 the insn under examination, VAR is the variable to fix up
1690 references to, PROMOTED_MODE and UNSIGNEDP describe VAR, and
1691 TOPLEVEL is nonzero if this is the main insn chain for this
1695 fixup_var_refs_insn (insn, var, promoted_mode, unsignedp, toplevel)
1698 enum machine_mode promoted_mode;
1703 rtx set, prev, prev_set;
1706 /* Remember the notes in case we delete the insn. */
1707 note = REG_NOTES (insn);
1709 /* If this is a CLOBBER of VAR, delete it.
1711 If it has a REG_LIBCALL note, delete the REG_LIBCALL
1712 and REG_RETVAL notes too. */
1713 if (GET_CODE (PATTERN (insn)) == CLOBBER
1714 && (XEXP (PATTERN (insn), 0) == var
1715 || (GET_CODE (XEXP (PATTERN (insn), 0)) == CONCAT
1716 && (XEXP (XEXP (PATTERN (insn), 0), 0) == var
1717 || XEXP (XEXP (PATTERN (insn), 0), 1) == var))))
1719 if ((note = find_reg_note (insn, REG_LIBCALL, NULL_RTX)) != 0)
1720 /* The REG_LIBCALL note will go away since we are going to
1721 turn INSN into a NOTE, so just delete the
1722 corresponding REG_RETVAL note. */
1723 remove_note (XEXP (note, 0),
1724 find_reg_note (XEXP (note, 0), REG_RETVAL,
1730 /* The insn to load VAR from a home in the arglist
1731 is now a no-op. When we see it, just delete it.
1732 Similarly if this is storing VAR from a register from which
1733 it was loaded in the previous insn. This will occur
1734 when an ADDRESSOF was made for an arglist slot. */
1736 && (set = single_set (insn)) != 0
1737 && SET_DEST (set) == var
1738 /* If this represents the result of an insn group,
1739 don't delete the insn. */
1740 && find_reg_note (insn, REG_RETVAL, NULL_RTX) == 0
1741 && (rtx_equal_p (SET_SRC (set), var)
1742 || (GET_CODE (SET_SRC (set)) == REG
1743 && (prev = prev_nonnote_insn (insn)) != 0
1744 && (prev_set = single_set (prev)) != 0
1745 && SET_DEST (prev_set) == SET_SRC (set)
1746 && rtx_equal_p (SET_SRC (prev_set), var))))
1752 struct fixup_replacement *replacements = 0;
1753 rtx next_insn = NEXT_INSN (insn);
1755 if (SMALL_REGISTER_CLASSES)
1757 /* If the insn that copies the results of a CALL_INSN
1758 into a pseudo now references VAR, we have to use an
1759 intermediate pseudo since we want the life of the
1760 return value register to be only a single insn.
1762 If we don't use an intermediate pseudo, such things as
1763 address computations to make the address of VAR valid
1764 if it is not can be placed between the CALL_INSN and INSN.
1766 To make sure this doesn't happen, we record the destination
1767 of the CALL_INSN and see if the next insn uses both that
1770 if (call_dest != 0 && GET_CODE (insn) == INSN
1771 && reg_mentioned_p (var, PATTERN (insn))
1772 && reg_mentioned_p (call_dest, PATTERN (insn)))
1774 rtx temp = gen_reg_rtx (GET_MODE (call_dest));
1776 emit_insn_before (gen_move_insn (temp, call_dest), insn);
1778 PATTERN (insn) = replace_rtx (PATTERN (insn),
1782 if (GET_CODE (insn) == CALL_INSN
1783 && GET_CODE (PATTERN (insn)) == SET)
1784 call_dest = SET_DEST (PATTERN (insn));
1785 else if (GET_CODE (insn) == CALL_INSN
1786 && GET_CODE (PATTERN (insn)) == PARALLEL
1787 && GET_CODE (XVECEXP (PATTERN (insn), 0, 0)) == SET)
1788 call_dest = SET_DEST (XVECEXP (PATTERN (insn), 0, 0));
1793 /* See if we have to do anything to INSN now that VAR is in
1794 memory. If it needs to be loaded into a pseudo, use a single
1795 pseudo for the entire insn in case there is a MATCH_DUP
1796 between two operands. We pass a pointer to the head of
1797 a list of struct fixup_replacements. If fixup_var_refs_1
1798 needs to allocate pseudos or replacement MEMs (for SUBREGs),
1799 it will record them in this list.
1801 If it allocated a pseudo for any replacement, we copy into
1804 fixup_var_refs_1 (var, promoted_mode, &PATTERN (insn), insn,
1807 /* If this is last_parm_insn, and any instructions were output
1808 after it to fix it up, then we must set last_parm_insn to
1809 the last such instruction emitted. */
1810 if (insn == last_parm_insn)
1811 last_parm_insn = PREV_INSN (next_insn);
1813 while (replacements)
1815 struct fixup_replacement *next;
1817 if (GET_CODE (replacements->new) == REG)
1822 /* OLD might be a (subreg (mem)). */
1823 if (GET_CODE (replacements->old) == SUBREG)
1825 = fixup_memory_subreg (replacements->old, insn, 0);
1828 = fixup_stack_1 (replacements->old, insn);
1830 insert_before = insn;
1832 /* If we are changing the mode, do a conversion.
1833 This might be wasteful, but combine.c will
1834 eliminate much of the waste. */
1836 if (GET_MODE (replacements->new)
1837 != GET_MODE (replacements->old))
1840 convert_move (replacements->new,
1841 replacements->old, unsignedp);
1842 seq = gen_sequence ();
1846 seq = gen_move_insn (replacements->new,
1849 emit_insn_before (seq, insert_before);
1852 next = replacements->next;
1853 free (replacements);
1854 replacements = next;
1858 /* Also fix up any invalid exprs in the REG_NOTES of this insn.
1859 But don't touch other insns referred to by reg-notes;
1860 we will get them elsewhere. */
1863 if (GET_CODE (note) != INSN_LIST)
1865 = walk_fixup_memory_subreg (XEXP (note, 0), insn, 1);
1866 note = XEXP (note, 1);
1870 /* VAR is a MEM that used to be a pseudo register with mode PROMOTED_MODE.
1871 See if the rtx expression at *LOC in INSN needs to be changed.
1873 REPLACEMENTS is a pointer to a list head that starts out zero, but may
1874 contain a list of original rtx's and replacements. If we find that we need
1875 to modify this insn by replacing a memory reference with a pseudo or by
1876 making a new MEM to implement a SUBREG, we consult that list to see if
1877 we have already chosen a replacement. If none has already been allocated,
1878 we allocate it and update the list. fixup_var_refs_insn will copy VAR
1879 or the SUBREG, as appropriate, to the pseudo. */
1882 fixup_var_refs_1 (var, promoted_mode, loc, insn, replacements)
1884 enum machine_mode promoted_mode;
1887 struct fixup_replacement **replacements;
1891 RTX_CODE code = GET_CODE (x);
1894 struct fixup_replacement *replacement;
1899 if (XEXP (x, 0) == var)
1901 /* Prevent sharing of rtl that might lose. */
1902 rtx sub = copy_rtx (XEXP (var, 0));
1904 if (! validate_change (insn, loc, sub, 0))
1906 rtx y = gen_reg_rtx (GET_MODE (sub));
1909 /* We should be able to replace with a register or all is lost.
1910 Note that we can't use validate_change to verify this, since
1911 we're not caring for replacing all dups simultaneously. */
1912 if (! validate_replace_rtx (*loc, y, insn))
1915 /* Careful! First try to recognize a direct move of the
1916 value, mimicking how things are done in gen_reload wrt
1917 PLUS. Consider what happens when insn is a conditional
1918 move instruction and addsi3 clobbers flags. */
1921 new_insn = emit_insn (gen_rtx_SET (VOIDmode, y, sub));
1922 seq = gen_sequence ();
1925 if (recog_memoized (new_insn) < 0)
1927 /* That failed. Fall back on force_operand and hope. */
1930 sub = force_operand (sub, y);
1932 emit_insn (gen_move_insn (y, sub));
1933 seq = gen_sequence ();
1938 /* Don't separate setter from user. */
1939 if (PREV_INSN (insn) && sets_cc0_p (PREV_INSN (insn)))
1940 insn = PREV_INSN (insn);
1943 emit_insn_before (seq, insn);
1951 /* If we already have a replacement, use it. Otherwise,
1952 try to fix up this address in case it is invalid. */
1954 replacement = find_fixup_replacement (replacements, var);
1955 if (replacement->new)
1957 *loc = replacement->new;
1961 *loc = replacement->new = x = fixup_stack_1 (x, insn);
1963 /* Unless we are forcing memory to register or we changed the mode,
1964 we can leave things the way they are if the insn is valid. */
1966 INSN_CODE (insn) = -1;
1967 if (! flag_force_mem && GET_MODE (x) == promoted_mode
1968 && recog_memoized (insn) >= 0)
1971 *loc = replacement->new = gen_reg_rtx (promoted_mode);
1975 /* If X contains VAR, we need to unshare it here so that we update
1976 each occurrence separately. But all identical MEMs in one insn
1977 must be replaced with the same rtx because of the possibility of
1980 if (reg_mentioned_p (var, x))
1982 replacement = find_fixup_replacement (replacements, x);
1983 if (replacement->new == 0)
1984 replacement->new = copy_most_rtx (x, var);
1986 *loc = x = replacement->new;
1987 code = GET_CODE (x);
2003 /* Note that in some cases those types of expressions are altered
2004 by optimize_bit_field, and do not survive to get here. */
2005 if (XEXP (x, 0) == var
2006 || (GET_CODE (XEXP (x, 0)) == SUBREG
2007 && SUBREG_REG (XEXP (x, 0)) == var))
2009 /* Get TEM as a valid MEM in the mode presently in the insn.
2011 We don't worry about the possibility of MATCH_DUP here; it
2012 is highly unlikely and would be tricky to handle. */
2015 if (GET_CODE (tem) == SUBREG)
2017 if (GET_MODE_BITSIZE (GET_MODE (tem))
2018 > GET_MODE_BITSIZE (GET_MODE (var)))
2020 replacement = find_fixup_replacement (replacements, var);
2021 if (replacement->new == 0)
2022 replacement->new = gen_reg_rtx (GET_MODE (var));
2023 SUBREG_REG (tem) = replacement->new;
2025 /* The following code works only if we have a MEM, so we
2026 need to handle the subreg here. We directly substitute
2027 it assuming that a subreg must be OK here. We already
2028 scheduled a replacement to copy the mem into the
2034 tem = fixup_memory_subreg (tem, insn, 0);
2037 tem = fixup_stack_1 (tem, insn);
2039 /* Unless we want to load from memory, get TEM into the proper mode
2040 for an extract from memory. This can only be done if the
2041 extract is at a constant position and length. */
2043 if (! flag_force_mem && GET_CODE (XEXP (x, 1)) == CONST_INT
2044 && GET_CODE (XEXP (x, 2)) == CONST_INT
2045 && ! mode_dependent_address_p (XEXP (tem, 0))
2046 && ! MEM_VOLATILE_P (tem))
2048 enum machine_mode wanted_mode = VOIDmode;
2049 enum machine_mode is_mode = GET_MODE (tem);
2050 HOST_WIDE_INT pos = INTVAL (XEXP (x, 2));
2052 if (GET_CODE (x) == ZERO_EXTRACT)
2054 enum machine_mode new_mode
2055 = mode_for_extraction (EP_extzv, 1);
2056 if (new_mode != MAX_MACHINE_MODE)
2057 wanted_mode = new_mode;
2059 else if (GET_CODE (x) == SIGN_EXTRACT)
2061 enum machine_mode new_mode
2062 = mode_for_extraction (EP_extv, 1);
2063 if (new_mode != MAX_MACHINE_MODE)
2064 wanted_mode = new_mode;
2067 /* If we have a narrower mode, we can do something. */
2068 if (wanted_mode != VOIDmode
2069 && GET_MODE_SIZE (wanted_mode) < GET_MODE_SIZE (is_mode))
2071 HOST_WIDE_INT offset = pos / BITS_PER_UNIT;
2072 rtx old_pos = XEXP (x, 2);
2075 /* If the bytes and bits are counted differently, we
2076 must adjust the offset. */
2077 if (BYTES_BIG_ENDIAN != BITS_BIG_ENDIAN)
2078 offset = (GET_MODE_SIZE (is_mode)
2079 - GET_MODE_SIZE (wanted_mode) - offset);
2081 pos %= GET_MODE_BITSIZE (wanted_mode);
2083 newmem = adjust_address_nv (tem, wanted_mode, offset);
2085 /* Make the change and see if the insn remains valid. */
2086 INSN_CODE (insn) = -1;
2087 XEXP (x, 0) = newmem;
2088 XEXP (x, 2) = GEN_INT (pos);
2090 if (recog_memoized (insn) >= 0)
2093 /* Otherwise, restore old position. XEXP (x, 0) will be
2095 XEXP (x, 2) = old_pos;
2099 /* If we get here, the bitfield extract insn can't accept a memory
2100 reference. Copy the input into a register. */
2102 tem1 = gen_reg_rtx (GET_MODE (tem));
2103 emit_insn_before (gen_move_insn (tem1, tem), insn);
2110 if (SUBREG_REG (x) == var)
2112 /* If this is a special SUBREG made because VAR was promoted
2113 from a wider mode, replace it with VAR and call ourself
2114 recursively, this time saying that the object previously
2115 had its current mode (by virtue of the SUBREG). */
2117 if (SUBREG_PROMOTED_VAR_P (x))
2120 fixup_var_refs_1 (var, GET_MODE (var), loc, insn, replacements);
2124 /* If this SUBREG makes VAR wider, it has become a paradoxical
2125 SUBREG with VAR in memory, but these aren't allowed at this
2126 stage of the compilation. So load VAR into a pseudo and take
2127 a SUBREG of that pseudo. */
2128 if (GET_MODE_SIZE (GET_MODE (x)) > GET_MODE_SIZE (GET_MODE (var)))
2130 replacement = find_fixup_replacement (replacements, var);
2131 if (replacement->new == 0)
2132 replacement->new = gen_reg_rtx (promoted_mode);
2133 SUBREG_REG (x) = replacement->new;
2137 /* See if we have already found a replacement for this SUBREG.
2138 If so, use it. Otherwise, make a MEM and see if the insn
2139 is recognized. If not, or if we should force MEM into a register,
2140 make a pseudo for this SUBREG. */
2141 replacement = find_fixup_replacement (replacements, x);
2142 if (replacement->new)
2144 *loc = replacement->new;
2148 replacement->new = *loc = fixup_memory_subreg (x, insn, 0);
2150 INSN_CODE (insn) = -1;
2151 if (! flag_force_mem && recog_memoized (insn) >= 0)
2154 *loc = replacement->new = gen_reg_rtx (GET_MODE (x));
2160 /* First do special simplification of bit-field references. */
2161 if (GET_CODE (SET_DEST (x)) == SIGN_EXTRACT
2162 || GET_CODE (SET_DEST (x)) == ZERO_EXTRACT)
2163 optimize_bit_field (x, insn, 0);
2164 if (GET_CODE (SET_SRC (x)) == SIGN_EXTRACT
2165 || GET_CODE (SET_SRC (x)) == ZERO_EXTRACT)
2166 optimize_bit_field (x, insn, 0);
2168 /* For a paradoxical SUBREG inside a ZERO_EXTRACT, load the object
2169 into a register and then store it back out. */
2170 if (GET_CODE (SET_DEST (x)) == ZERO_EXTRACT
2171 && GET_CODE (XEXP (SET_DEST (x), 0)) == SUBREG
2172 && SUBREG_REG (XEXP (SET_DEST (x), 0)) == var
2173 && (GET_MODE_SIZE (GET_MODE (XEXP (SET_DEST (x), 0)))
2174 > GET_MODE_SIZE (GET_MODE (var))))
2176 replacement = find_fixup_replacement (replacements, var);
2177 if (replacement->new == 0)
2178 replacement->new = gen_reg_rtx (GET_MODE (var));
2180 SUBREG_REG (XEXP (SET_DEST (x), 0)) = replacement->new;
2181 emit_insn_after (gen_move_insn (var, replacement->new), insn);
2184 /* If SET_DEST is now a paradoxical SUBREG, put the result of this
2185 insn into a pseudo and store the low part of the pseudo into VAR. */
2186 if (GET_CODE (SET_DEST (x)) == SUBREG
2187 && SUBREG_REG (SET_DEST (x)) == var
2188 && (GET_MODE_SIZE (GET_MODE (SET_DEST (x)))
2189 > GET_MODE_SIZE (GET_MODE (var))))
2191 SET_DEST (x) = tem = gen_reg_rtx (GET_MODE (SET_DEST (x)));
2192 emit_insn_after (gen_move_insn (var, gen_lowpart (GET_MODE (var),
2199 rtx dest = SET_DEST (x);
2200 rtx src = SET_SRC (x);
2201 rtx outerdest = dest;
2203 while (GET_CODE (dest) == SUBREG || GET_CODE (dest) == STRICT_LOW_PART
2204 || GET_CODE (dest) == SIGN_EXTRACT
2205 || GET_CODE (dest) == ZERO_EXTRACT)
2206 dest = XEXP (dest, 0);
2208 if (GET_CODE (src) == SUBREG)
2209 src = SUBREG_REG (src);
2211 /* If VAR does not appear at the top level of the SET
2212 just scan the lower levels of the tree. */
2214 if (src != var && dest != var)
2217 /* We will need to rerecognize this insn. */
2218 INSN_CODE (insn) = -1;
2220 if (GET_CODE (outerdest) == ZERO_EXTRACT && dest == var
2221 && mode_for_extraction (EP_insv, -1) != MAX_MACHINE_MODE)
2223 /* Since this case will return, ensure we fixup all the
2225 fixup_var_refs_1 (var, promoted_mode, &XEXP (outerdest, 1),
2226 insn, replacements);
2227 fixup_var_refs_1 (var, promoted_mode, &XEXP (outerdest, 2),
2228 insn, replacements);
2229 fixup_var_refs_1 (var, promoted_mode, &SET_SRC (x),
2230 insn, replacements);
2232 tem = XEXP (outerdest, 0);
2234 /* Clean up (SUBREG:SI (MEM:mode ...) 0)
2235 that may appear inside a ZERO_EXTRACT.
2236 This was legitimate when the MEM was a REG. */
2237 if (GET_CODE (tem) == SUBREG
2238 && SUBREG_REG (tem) == var)
2239 tem = fixup_memory_subreg (tem, insn, 0);
2241 tem = fixup_stack_1 (tem, insn);
2243 if (GET_CODE (XEXP (outerdest, 1)) == CONST_INT
2244 && GET_CODE (XEXP (outerdest, 2)) == CONST_INT
2245 && ! mode_dependent_address_p (XEXP (tem, 0))
2246 && ! MEM_VOLATILE_P (tem))
2248 enum machine_mode wanted_mode;
2249 enum machine_mode is_mode = GET_MODE (tem);
2250 HOST_WIDE_INT pos = INTVAL (XEXP (outerdest, 2));
2252 wanted_mode = mode_for_extraction (EP_insv, 0);
2254 /* If we have a narrower mode, we can do something. */
2255 if (GET_MODE_SIZE (wanted_mode) < GET_MODE_SIZE (is_mode))
2257 HOST_WIDE_INT offset = pos / BITS_PER_UNIT;
2258 rtx old_pos = XEXP (outerdest, 2);
2261 if (BYTES_BIG_ENDIAN != BITS_BIG_ENDIAN)
2262 offset = (GET_MODE_SIZE (is_mode)
2263 - GET_MODE_SIZE (wanted_mode) - offset);
2265 pos %= GET_MODE_BITSIZE (wanted_mode);
2267 newmem = adjust_address_nv (tem, wanted_mode, offset);
2269 /* Make the change and see if the insn remains valid. */
2270 INSN_CODE (insn) = -1;
2271 XEXP (outerdest, 0) = newmem;
2272 XEXP (outerdest, 2) = GEN_INT (pos);
2274 if (recog_memoized (insn) >= 0)
2277 /* Otherwise, restore old position. XEXP (x, 0) will be
2279 XEXP (outerdest, 2) = old_pos;
2283 /* If we get here, the bit-field store doesn't allow memory
2284 or isn't located at a constant position. Load the value into
2285 a register, do the store, and put it back into memory. */
2287 tem1 = gen_reg_rtx (GET_MODE (tem));
2288 emit_insn_before (gen_move_insn (tem1, tem), insn);
2289 emit_insn_after (gen_move_insn (tem, tem1), insn);
2290 XEXP (outerdest, 0) = tem1;
2294 /* STRICT_LOW_PART is a no-op on memory references
2295 and it can cause combinations to be unrecognizable,
2298 if (dest == var && GET_CODE (SET_DEST (x)) == STRICT_LOW_PART)
2299 SET_DEST (x) = XEXP (SET_DEST (x), 0);
2301 /* A valid insn to copy VAR into or out of a register
2302 must be left alone, to avoid an infinite loop here.
2303 If the reference to VAR is by a subreg, fix that up,
2304 since SUBREG is not valid for a memref.
2305 Also fix up the address of the stack slot.
2307 Note that we must not try to recognize the insn until
2308 after we know that we have valid addresses and no
2309 (subreg (mem ...) ...) constructs, since these interfere
2310 with determining the validity of the insn. */
2312 if ((SET_SRC (x) == var
2313 || (GET_CODE (SET_SRC (x)) == SUBREG
2314 && SUBREG_REG (SET_SRC (x)) == var))
2315 && (GET_CODE (SET_DEST (x)) == REG
2316 || (GET_CODE (SET_DEST (x)) == SUBREG
2317 && GET_CODE (SUBREG_REG (SET_DEST (x))) == REG))
2318 && GET_MODE (var) == promoted_mode
2319 && x == single_set (insn))
2323 replacement = find_fixup_replacement (replacements, SET_SRC (x));
2324 if (replacement->new)
2325 SET_SRC (x) = replacement->new;
2326 else if (GET_CODE (SET_SRC (x)) == SUBREG)
2327 SET_SRC (x) = replacement->new
2328 = fixup_memory_subreg (SET_SRC (x), insn, 0);
2330 SET_SRC (x) = replacement->new
2331 = fixup_stack_1 (SET_SRC (x), insn);
2333 if (recog_memoized (insn) >= 0)
2336 /* INSN is not valid, but we know that we want to
2337 copy SET_SRC (x) to SET_DEST (x) in some way. So
2338 we generate the move and see whether it requires more
2339 than one insn. If it does, we emit those insns and
2340 delete INSN. Otherwise, we an just replace the pattern
2341 of INSN; we have already verified above that INSN has
2342 no other function that to do X. */
2344 pat = gen_move_insn (SET_DEST (x), SET_SRC (x));
2345 if (GET_CODE (pat) == SEQUENCE)
2347 last = emit_insn_before (pat, insn);
2349 /* INSN might have REG_RETVAL or other important notes, so
2350 we need to store the pattern of the last insn in the
2351 sequence into INSN similarly to the normal case. LAST
2352 should not have REG_NOTES, but we allow them if INSN has
2354 if (REG_NOTES (last) && REG_NOTES (insn))
2356 if (REG_NOTES (last))
2357 REG_NOTES (insn) = REG_NOTES (last);
2358 PATTERN (insn) = PATTERN (last);
2363 PATTERN (insn) = pat;
2368 if ((SET_DEST (x) == var
2369 || (GET_CODE (SET_DEST (x)) == SUBREG
2370 && SUBREG_REG (SET_DEST (x)) == var))
2371 && (GET_CODE (SET_SRC (x)) == REG
2372 || (GET_CODE (SET_SRC (x)) == SUBREG
2373 && GET_CODE (SUBREG_REG (SET_SRC (x))) == REG))
2374 && GET_MODE (var) == promoted_mode
2375 && x == single_set (insn))
2379 if (GET_CODE (SET_DEST (x)) == SUBREG)
2380 SET_DEST (x) = fixup_memory_subreg (SET_DEST (x), insn, 0);
2382 SET_DEST (x) = fixup_stack_1 (SET_DEST (x), insn);
2384 if (recog_memoized (insn) >= 0)
2387 pat = gen_move_insn (SET_DEST (x), SET_SRC (x));
2388 if (GET_CODE (pat) == SEQUENCE)
2390 last = emit_insn_before (pat, insn);
2392 /* INSN might have REG_RETVAL or other important notes, so
2393 we need to store the pattern of the last insn in the
2394 sequence into INSN similarly to the normal case. LAST
2395 should not have REG_NOTES, but we allow them if INSN has
2397 if (REG_NOTES (last) && REG_NOTES (insn))
2399 if (REG_NOTES (last))
2400 REG_NOTES (insn) = REG_NOTES (last);
2401 PATTERN (insn) = PATTERN (last);
2406 PATTERN (insn) = pat;
2411 /* Otherwise, storing into VAR must be handled specially
2412 by storing into a temporary and copying that into VAR
2413 with a new insn after this one. Note that this case
2414 will be used when storing into a promoted scalar since
2415 the insn will now have different modes on the input
2416 and output and hence will be invalid (except for the case
2417 of setting it to a constant, which does not need any
2418 change if it is valid). We generate extra code in that case,
2419 but combine.c will eliminate it. */
2424 rtx fixeddest = SET_DEST (x);
2426 /* STRICT_LOW_PART can be discarded, around a MEM. */
2427 if (GET_CODE (fixeddest) == STRICT_LOW_PART)
2428 fixeddest = XEXP (fixeddest, 0);
2429 /* Convert (SUBREG (MEM)) to a MEM in a changed mode. */
2430 if (GET_CODE (fixeddest) == SUBREG)
2432 fixeddest = fixup_memory_subreg (fixeddest, insn, 0);
2433 promoted_mode = GET_MODE (fixeddest);
2436 fixeddest = fixup_stack_1 (fixeddest, insn);
2438 temp = gen_reg_rtx (promoted_mode);
2440 emit_insn_after (gen_move_insn (fixeddest,
2441 gen_lowpart (GET_MODE (fixeddest),
2445 SET_DEST (x) = temp;
2453 /* Nothing special about this RTX; fix its operands. */
2455 fmt = GET_RTX_FORMAT (code);
2456 for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
2459 fixup_var_refs_1 (var, promoted_mode, &XEXP (x, i), insn, replacements);
2460 else if (fmt[i] == 'E')
2463 for (j = 0; j < XVECLEN (x, i); j++)
2464 fixup_var_refs_1 (var, promoted_mode, &XVECEXP (x, i, j),
2465 insn, replacements);
2470 /* Given X, an rtx of the form (SUBREG:m1 (MEM:m2 addr)),
2471 return an rtx (MEM:m1 newaddr) which is equivalent.
2472 If any insns must be emitted to compute NEWADDR, put them before INSN.
2474 UNCRITICAL nonzero means accept paradoxical subregs.
2475 This is used for subregs found inside REG_NOTES. */
2478 fixup_memory_subreg (x, insn, uncritical)
2483 int offset = SUBREG_BYTE (x);
2484 rtx addr = XEXP (SUBREG_REG (x), 0);
2485 enum machine_mode mode = GET_MODE (x);
2488 /* Paradoxical SUBREGs are usually invalid during RTL generation. */
2489 if (GET_MODE_SIZE (mode) > GET_MODE_SIZE (GET_MODE (SUBREG_REG (x)))
2493 if (!flag_force_addr
2494 && memory_address_p (mode, plus_constant (addr, offset)))
2495 /* Shortcut if no insns need be emitted. */
2496 return adjust_address (SUBREG_REG (x), mode, offset);
2499 result = adjust_address (SUBREG_REG (x), mode, offset);
2500 emit_insn_before (gen_sequence (), insn);
2505 /* Do fixup_memory_subreg on all (SUBREG (MEM ...) ...) contained in X.
2506 Replace subexpressions of X in place.
2507 If X itself is a (SUBREG (MEM ...) ...), return the replacement expression.
2508 Otherwise return X, with its contents possibly altered.
2510 If any insns must be emitted to compute NEWADDR, put them before INSN.
2512 UNCRITICAL is as in fixup_memory_subreg. */
2515 walk_fixup_memory_subreg (x, insn, uncritical)
2527 code = GET_CODE (x);
2529 if (code == SUBREG && GET_CODE (SUBREG_REG (x)) == MEM)
2530 return fixup_memory_subreg (x, insn, uncritical);
2532 /* Nothing special about this RTX; fix its operands. */
2534 fmt = GET_RTX_FORMAT (code);
2535 for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
2538 XEXP (x, i) = walk_fixup_memory_subreg (XEXP (x, i), insn, uncritical);
2539 else if (fmt[i] == 'E')
2542 for (j = 0; j < XVECLEN (x, i); j++)
2544 = walk_fixup_memory_subreg (XVECEXP (x, i, j), insn, uncritical);
2550 /* For each memory ref within X, if it refers to a stack slot
2551 with an out of range displacement, put the address in a temp register
2552 (emitting new insns before INSN to load these registers)
2553 and alter the memory ref to use that register.
2554 Replace each such MEM rtx with a copy, to avoid clobberage. */
2557 fixup_stack_1 (x, insn)
2562 RTX_CODE code = GET_CODE (x);
2567 rtx ad = XEXP (x, 0);
2568 /* If we have address of a stack slot but it's not valid
2569 (displacement is too large), compute the sum in a register. */
2570 if (GET_CODE (ad) == PLUS
2571 && GET_CODE (XEXP (ad, 0)) == REG
2572 && ((REGNO (XEXP (ad, 0)) >= FIRST_VIRTUAL_REGISTER
2573 && REGNO (XEXP (ad, 0)) <= LAST_VIRTUAL_REGISTER)
2574 || REGNO (XEXP (ad, 0)) == FRAME_POINTER_REGNUM
2575 #if HARD_FRAME_POINTER_REGNUM != FRAME_POINTER_REGNUM
2576 || REGNO (XEXP (ad, 0)) == HARD_FRAME_POINTER_REGNUM
2578 || REGNO (XEXP (ad, 0)) == STACK_POINTER_REGNUM
2579 || REGNO (XEXP (ad, 0)) == ARG_POINTER_REGNUM
2580 || XEXP (ad, 0) == current_function_internal_arg_pointer)
2581 && GET_CODE (XEXP (ad, 1)) == CONST_INT)
2584 if (memory_address_p (GET_MODE (x), ad))
2588 temp = copy_to_reg (ad);
2589 seq = gen_sequence ();
2591 emit_insn_before (seq, insn);
2592 return replace_equiv_address (x, temp);
2597 fmt = GET_RTX_FORMAT (code);
2598 for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
2601 XEXP (x, i) = fixup_stack_1 (XEXP (x, i), insn);
2602 else if (fmt[i] == 'E')
2605 for (j = 0; j < XVECLEN (x, i); j++)
2606 XVECEXP (x, i, j) = fixup_stack_1 (XVECEXP (x, i, j), insn);
2612 /* Optimization: a bit-field instruction whose field
2613 happens to be a byte or halfword in memory
2614 can be changed to a move instruction.
2616 We call here when INSN is an insn to examine or store into a bit-field.
2617 BODY is the SET-rtx to be altered.
2619 EQUIV_MEM is the table `reg_equiv_mem' if that is available; else 0.
2620 (Currently this is called only from function.c, and EQUIV_MEM
2624 optimize_bit_field (body, insn, equiv_mem)
2632 enum machine_mode mode;
2634 if (GET_CODE (SET_DEST (body)) == SIGN_EXTRACT
2635 || GET_CODE (SET_DEST (body)) == ZERO_EXTRACT)
2636 bitfield = SET_DEST (body), destflag = 1;
2638 bitfield = SET_SRC (body), destflag = 0;
2640 /* First check that the field being stored has constant size and position
2641 and is in fact a byte or halfword suitably aligned. */
2643 if (GET_CODE (XEXP (bitfield, 1)) == CONST_INT
2644 && GET_CODE (XEXP (bitfield, 2)) == CONST_INT
2645 && ((mode = mode_for_size (INTVAL (XEXP (bitfield, 1)), MODE_INT, 1))
2647 && INTVAL (XEXP (bitfield, 2)) % INTVAL (XEXP (bitfield, 1)) == 0)
2651 /* Now check that the containing word is memory, not a register,
2652 and that it is safe to change the machine mode. */
2654 if (GET_CODE (XEXP (bitfield, 0)) == MEM)
2655 memref = XEXP (bitfield, 0);
2656 else if (GET_CODE (XEXP (bitfield, 0)) == REG
2658 memref = equiv_mem[REGNO (XEXP (bitfield, 0))];
2659 else if (GET_CODE (XEXP (bitfield, 0)) == SUBREG
2660 && GET_CODE (SUBREG_REG (XEXP (bitfield, 0))) == MEM)
2661 memref = SUBREG_REG (XEXP (bitfield, 0));
2662 else if (GET_CODE (XEXP (bitfield, 0)) == SUBREG
2664 && GET_CODE (SUBREG_REG (XEXP (bitfield, 0))) == REG)
2665 memref = equiv_mem[REGNO (SUBREG_REG (XEXP (bitfield, 0)))];
2668 && ! mode_dependent_address_p (XEXP (memref, 0))
2669 && ! MEM_VOLATILE_P (memref))
2671 /* Now adjust the address, first for any subreg'ing
2672 that we are now getting rid of,
2673 and then for which byte of the word is wanted. */
2675 HOST_WIDE_INT offset = INTVAL (XEXP (bitfield, 2));
2678 /* Adjust OFFSET to count bits from low-address byte. */
2679 if (BITS_BIG_ENDIAN != BYTES_BIG_ENDIAN)
2680 offset = (GET_MODE_BITSIZE (GET_MODE (XEXP (bitfield, 0)))
2681 - offset - INTVAL (XEXP (bitfield, 1)));
2683 /* Adjust OFFSET to count bytes from low-address byte. */
2684 offset /= BITS_PER_UNIT;
2685 if (GET_CODE (XEXP (bitfield, 0)) == SUBREG)
2687 offset += (SUBREG_BYTE (XEXP (bitfield, 0))
2688 / UNITS_PER_WORD) * UNITS_PER_WORD;
2689 if (BYTES_BIG_ENDIAN)
2690 offset -= (MIN (UNITS_PER_WORD,
2691 GET_MODE_SIZE (GET_MODE (XEXP (bitfield, 0))))
2692 - MIN (UNITS_PER_WORD,
2693 GET_MODE_SIZE (GET_MODE (memref))));
2697 memref = adjust_address (memref, mode, offset);
2698 insns = get_insns ();
2700 emit_insns_before (insns, insn);
2702 /* Store this memory reference where
2703 we found the bit field reference. */
2707 validate_change (insn, &SET_DEST (body), memref, 1);
2708 if (! CONSTANT_ADDRESS_P (SET_SRC (body)))
2710 rtx src = SET_SRC (body);
2711 while (GET_CODE (src) == SUBREG
2712 && SUBREG_BYTE (src) == 0)
2713 src = SUBREG_REG (src);
2714 if (GET_MODE (src) != GET_MODE (memref))
2715 src = gen_lowpart (GET_MODE (memref), SET_SRC (body));
2716 validate_change (insn, &SET_SRC (body), src, 1);
2718 else if (GET_MODE (SET_SRC (body)) != VOIDmode
2719 && GET_MODE (SET_SRC (body)) != GET_MODE (memref))
2720 /* This shouldn't happen because anything that didn't have
2721 one of these modes should have got converted explicitly
2722 and then referenced through a subreg.
2723 This is so because the original bit-field was
2724 handled by agg_mode and so its tree structure had
2725 the same mode that memref now has. */
2730 rtx dest = SET_DEST (body);
2732 while (GET_CODE (dest) == SUBREG
2733 && SUBREG_BYTE (dest) == 0
2734 && (GET_MODE_CLASS (GET_MODE (dest))
2735 == GET_MODE_CLASS (GET_MODE (SUBREG_REG (dest))))
2736 && (GET_MODE_SIZE (GET_MODE (SUBREG_REG (dest)))
2738 dest = SUBREG_REG (dest);
2740 validate_change (insn, &SET_DEST (body), dest, 1);
2742 if (GET_MODE (dest) == GET_MODE (memref))
2743 validate_change (insn, &SET_SRC (body), memref, 1);
2746 /* Convert the mem ref to the destination mode. */
2747 rtx newreg = gen_reg_rtx (GET_MODE (dest));
2750 convert_move (newreg, memref,
2751 GET_CODE (SET_SRC (body)) == ZERO_EXTRACT);
2755 validate_change (insn, &SET_SRC (body), newreg, 1);
2759 /* See if we can convert this extraction or insertion into
2760 a simple move insn. We might not be able to do so if this
2761 was, for example, part of a PARALLEL.
2763 If we succeed, write out any needed conversions. If we fail,
2764 it is hard to guess why we failed, so don't do anything
2765 special; just let the optimization be suppressed. */
2767 if (apply_change_group () && seq)
2768 emit_insns_before (seq, insn);
2773 /* These routines are responsible for converting virtual register references
2774 to the actual hard register references once RTL generation is complete.
2776 The following four variables are used for communication between the
2777 routines. They contain the offsets of the virtual registers from their
2778 respective hard registers. */
2780 static int in_arg_offset;
2781 static int var_offset;
2782 static int dynamic_offset;
2783 static int out_arg_offset;
2784 static int cfa_offset;
2786 /* In most machines, the stack pointer register is equivalent to the bottom
2789 #ifndef STACK_POINTER_OFFSET
2790 #define STACK_POINTER_OFFSET 0
2793 /* If not defined, pick an appropriate default for the offset of dynamically
2794 allocated memory depending on the value of ACCUMULATE_OUTGOING_ARGS,
2795 REG_PARM_STACK_SPACE, and OUTGOING_REG_PARM_STACK_SPACE. */
2797 #ifndef STACK_DYNAMIC_OFFSET
2799 /* The bottom of the stack points to the actual arguments. If
2800 REG_PARM_STACK_SPACE is defined, this includes the space for the register
2801 parameters. However, if OUTGOING_REG_PARM_STACK space is not defined,
2802 stack space for register parameters is not pushed by the caller, but
2803 rather part of the fixed stack areas and hence not included in
2804 `current_function_outgoing_args_size'. Nevertheless, we must allow
2805 for it when allocating stack dynamic objects. */
2807 #if defined(REG_PARM_STACK_SPACE) && ! defined(OUTGOING_REG_PARM_STACK_SPACE)
2808 #define STACK_DYNAMIC_OFFSET(FNDECL) \
2809 ((ACCUMULATE_OUTGOING_ARGS \
2810 ? (current_function_outgoing_args_size + REG_PARM_STACK_SPACE (FNDECL)) : 0)\
2811 + (STACK_POINTER_OFFSET)) \
2814 #define STACK_DYNAMIC_OFFSET(FNDECL) \
2815 ((ACCUMULATE_OUTGOING_ARGS ? current_function_outgoing_args_size : 0) \
2816 + (STACK_POINTER_OFFSET))
2820 /* On most machines, the CFA coincides with the first incoming parm. */
2822 #ifndef ARG_POINTER_CFA_OFFSET
2823 #define ARG_POINTER_CFA_OFFSET(FNDECL) FIRST_PARM_OFFSET (FNDECL)
2826 /* Build up a (MEM (ADDRESSOF (REG))) rtx for a register REG that just had
2827 its address taken. DECL is the decl for the object stored in the
2828 register, for later use if we do need to force REG into the stack.
2829 REG is overwritten by the MEM like in put_reg_into_stack. */
2832 gen_mem_addressof (reg, decl)
2836 rtx r = gen_rtx_ADDRESSOF (Pmode, gen_reg_rtx (GET_MODE (reg)),
2839 /* Calculate this before we start messing with decl's RTL. */
2840 HOST_WIDE_INT set = decl ? get_alias_set (decl) : 0;
2842 /* If the original REG was a user-variable, then so is the REG whose
2843 address is being taken. Likewise for unchanging. */
2844 REG_USERVAR_P (XEXP (r, 0)) = REG_USERVAR_P (reg);
2845 RTX_UNCHANGING_P (XEXP (r, 0)) = RTX_UNCHANGING_P (reg);
2847 PUT_CODE (reg, MEM);
2848 MEM_ATTRS (reg) = 0;
2853 tree type = TREE_TYPE (decl);
2854 enum machine_mode decl_mode
2855 = (TREE_CODE (decl) == SAVE_EXPR ? TYPE_MODE (TREE_TYPE (decl))
2856 : DECL_MODE (decl));
2857 rtx decl_rtl = decl ? DECL_RTL_IF_SET (decl) : 0;
2859 PUT_MODE (reg, decl_mode);
2861 /* Clear DECL_RTL momentarily so functions below will work
2862 properly, then set it again. */
2863 if (decl_rtl == reg)
2864 SET_DECL_RTL (decl, 0);
2866 set_mem_attributes (reg, decl, 1);
2867 set_mem_alias_set (reg, set);
2869 if (decl_rtl == reg)
2870 SET_DECL_RTL (decl, reg);
2872 if (TREE_USED (decl) || DECL_INITIAL (decl) != 0)
2873 fixup_var_refs (reg, GET_MODE (reg), TREE_UNSIGNED (type), 0);
2876 fixup_var_refs (reg, GET_MODE (reg), 0, 0);
2881 /* If DECL has an RTL that is an ADDRESSOF rtx, put it into the stack. */
2884 flush_addressof (decl)
2887 if ((TREE_CODE (decl) == PARM_DECL || TREE_CODE (decl) == VAR_DECL)
2888 && DECL_RTL (decl) != 0
2889 && GET_CODE (DECL_RTL (decl)) == MEM
2890 && GET_CODE (XEXP (DECL_RTL (decl), 0)) == ADDRESSOF
2891 && GET_CODE (XEXP (XEXP (DECL_RTL (decl), 0), 0)) == REG)
2892 put_addressof_into_stack (XEXP (DECL_RTL (decl), 0), 0);
2895 /* Force the register pointed to by R, an ADDRESSOF rtx, into the stack. */
2898 put_addressof_into_stack (r, ht)
2900 struct hash_table *ht;
2903 int volatile_p, used_p;
2905 rtx reg = XEXP (r, 0);
2907 if (GET_CODE (reg) != REG)
2910 decl = ADDRESSOF_DECL (r);
2913 type = TREE_TYPE (decl);
2914 volatile_p = (TREE_CODE (decl) != SAVE_EXPR
2915 && TREE_THIS_VOLATILE (decl));
2916 used_p = (TREE_USED (decl)
2917 || (TREE_CODE (decl) != SAVE_EXPR
2918 && DECL_INITIAL (decl) != 0));
2927 put_reg_into_stack (0, reg, type, GET_MODE (reg), GET_MODE (reg),
2928 volatile_p, ADDRESSOF_REGNO (r), used_p, ht);
2931 /* List of replacements made below in purge_addressof_1 when creating
2932 bitfield insertions. */
2933 static rtx purge_bitfield_addressof_replacements;
2935 /* List of replacements made below in purge_addressof_1 for patterns
2936 (MEM (ADDRESSOF (REG ...))). The key of the list entry is the
2937 corresponding (ADDRESSOF (REG ...)) and value is a substitution for
2938 the all pattern. List PURGE_BITFIELD_ADDRESSOF_REPLACEMENTS is not
2939 enough in complex cases, e.g. when some field values can be
2940 extracted by usage MEM with narrower mode. */
2941 static rtx purge_addressof_replacements;
2943 /* Helper function for purge_addressof. See if the rtx expression at *LOC
2944 in INSN needs to be changed. If FORCE, always put any ADDRESSOFs into
2945 the stack. If the function returns FALSE then the replacement could not
2949 purge_addressof_1 (loc, insn, force, store, ht)
2953 struct hash_table *ht;
2961 /* Re-start here to avoid recursion in common cases. */
2968 code = GET_CODE (x);
2970 /* If we don't return in any of the cases below, we will recurse inside
2971 the RTX, which will normally result in any ADDRESSOF being forced into
2975 result = purge_addressof_1 (&SET_DEST (x), insn, force, 1, ht);
2976 result &= purge_addressof_1 (&SET_SRC (x), insn, force, 0, ht);
2979 else if (code == ADDRESSOF)
2983 if (GET_CODE (XEXP (x, 0)) != MEM)
2985 put_addressof_into_stack (x, ht);
2989 /* We must create a copy of the rtx because it was created by
2990 overwriting a REG rtx which is always shared. */
2991 sub = copy_rtx (XEXP (XEXP (x, 0), 0));
2992 if (validate_change (insn, loc, sub, 0)
2993 || validate_replace_rtx (x, sub, insn))
2997 sub = force_operand (sub, NULL_RTX);
2998 if (! validate_change (insn, loc, sub, 0)
2999 && ! validate_replace_rtx (x, sub, insn))
3002 insns = gen_sequence ();
3004 emit_insn_before (insns, insn);
3008 else if (code == MEM && GET_CODE (XEXP (x, 0)) == ADDRESSOF && ! force)
3010 rtx sub = XEXP (XEXP (x, 0), 0);
3012 if (GET_CODE (sub) == MEM)
3013 sub = adjust_address_nv (sub, GET_MODE (x), 0);
3014 else if (GET_CODE (sub) == REG
3015 && (MEM_VOLATILE_P (x) || GET_MODE (x) == BLKmode))
3017 else if (GET_CODE (sub) == REG && GET_MODE (x) != GET_MODE (sub))
3019 int size_x, size_sub;
3023 /* When processing REG_NOTES look at the list of
3024 replacements done on the insn to find the register that X
3028 for (tem = purge_bitfield_addressof_replacements;
3030 tem = XEXP (XEXP (tem, 1), 1))
3031 if (rtx_equal_p (x, XEXP (tem, 0)))
3033 *loc = XEXP (XEXP (tem, 1), 0);
3037 /* See comment for purge_addressof_replacements. */
3038 for (tem = purge_addressof_replacements;
3040 tem = XEXP (XEXP (tem, 1), 1))
3041 if (rtx_equal_p (XEXP (x, 0), XEXP (tem, 0)))
3043 rtx z = XEXP (XEXP (tem, 1), 0);
3045 if (GET_MODE (x) == GET_MODE (z)
3046 || (GET_CODE (XEXP (XEXP (tem, 1), 0)) != REG
3047 && GET_CODE (XEXP (XEXP (tem, 1), 0)) != SUBREG))
3050 /* It can happen that the note may speak of things
3051 in a wider (or just different) mode than the
3052 code did. This is especially true of
3055 if (GET_CODE (z) == SUBREG && SUBREG_BYTE (z) == 0)
3058 if (GET_MODE_SIZE (GET_MODE (x)) > UNITS_PER_WORD
3059 && (GET_MODE_SIZE (GET_MODE (x))
3060 > GET_MODE_SIZE (GET_MODE (z))))
3062 /* This can occur as a result in invalid
3063 pointer casts, e.g. float f; ...
3064 *(long long int *)&f.
3065 ??? We could emit a warning here, but
3066 without a line number that wouldn't be
3068 z = gen_rtx_SUBREG (GET_MODE (x), z, 0);
3071 z = gen_lowpart (GET_MODE (x), z);
3077 /* Sometimes we may not be able to find the replacement. For
3078 example when the original insn was a MEM in a wider mode,
3079 and the note is part of a sign extension of a narrowed
3080 version of that MEM. Gcc testcase compile/990829-1.c can
3081 generate an example of this siutation. Rather than complain
3082 we return false, which will prompt our caller to remove the
3087 size_x = GET_MODE_BITSIZE (GET_MODE (x));
3088 size_sub = GET_MODE_BITSIZE (GET_MODE (sub));
3090 /* Don't even consider working with paradoxical subregs,
3091 or the moral equivalent seen here. */
3092 if (size_x <= size_sub
3093 && int_mode_for_mode (GET_MODE (sub)) != BLKmode)
3095 /* Do a bitfield insertion to mirror what would happen
3102 rtx p = PREV_INSN (insn);
3105 val = gen_reg_rtx (GET_MODE (x));
3106 if (! validate_change (insn, loc, val, 0))
3108 /* Discard the current sequence and put the
3109 ADDRESSOF on stack. */
3113 seq = gen_sequence ();
3115 emit_insn_before (seq, insn);
3116 compute_insns_for_mem (p ? NEXT_INSN (p) : get_insns (),
3120 store_bit_field (sub, size_x, 0, GET_MODE (x),
3121 val, GET_MODE_SIZE (GET_MODE (sub)),
3122 GET_MODE_ALIGNMENT (GET_MODE (sub)));
3124 /* Make sure to unshare any shared rtl that store_bit_field
3125 might have created. */
3126 unshare_all_rtl_again (get_insns ());
3128 seq = gen_sequence ();
3130 p = emit_insn_after (seq, insn);
3131 if (NEXT_INSN (insn))
3132 compute_insns_for_mem (NEXT_INSN (insn),
3133 p ? NEXT_INSN (p) : NULL_RTX,
3138 rtx p = PREV_INSN (insn);
3141 val = extract_bit_field (sub, size_x, 0, 1, NULL_RTX,
3142 GET_MODE (x), GET_MODE (x),
3143 GET_MODE_SIZE (GET_MODE (sub)),
3144 GET_MODE_SIZE (GET_MODE (sub)));
3146 if (! validate_change (insn, loc, val, 0))
3148 /* Discard the current sequence and put the
3149 ADDRESSOF on stack. */
3154 seq = gen_sequence ();
3156 emit_insn_before (seq, insn);
3157 compute_insns_for_mem (p ? NEXT_INSN (p) : get_insns (),
3161 /* Remember the replacement so that the same one can be done
3162 on the REG_NOTES. */
3163 purge_bitfield_addressof_replacements
3164 = gen_rtx_EXPR_LIST (VOIDmode, x,
3167 purge_bitfield_addressof_replacements));
3169 /* We replaced with a reg -- all done. */
3174 else if (validate_change (insn, loc, sub, 0))
3176 /* Remember the replacement so that the same one can be done
3177 on the REG_NOTES. */
3178 if (GET_CODE (sub) == REG || GET_CODE (sub) == SUBREG)
3182 for (tem = purge_addressof_replacements;
3184 tem = XEXP (XEXP (tem, 1), 1))
3185 if (rtx_equal_p (XEXP (x, 0), XEXP (tem, 0)))
3187 XEXP (XEXP (tem, 1), 0) = sub;
3190 purge_addressof_replacements
3191 = gen_rtx (EXPR_LIST, VOIDmode, XEXP (x, 0),
3192 gen_rtx_EXPR_LIST (VOIDmode, sub,
3193 purge_addressof_replacements));
3201 /* Scan all subexpressions. */
3202 fmt = GET_RTX_FORMAT (code);
3203 for (i = 0; i < GET_RTX_LENGTH (code); i++, fmt++)
3206 result &= purge_addressof_1 (&XEXP (x, i), insn, force, 0, ht);
3207 else if (*fmt == 'E')
3208 for (j = 0; j < XVECLEN (x, i); j++)
3209 result &= purge_addressof_1 (&XVECEXP (x, i, j), insn, force, 0, ht);
3215 /* Return a new hash table entry in HT. */
3217 static struct hash_entry *
3218 insns_for_mem_newfunc (he, ht, k)
3219 struct hash_entry *he;
3220 struct hash_table *ht;
3221 hash_table_key k ATTRIBUTE_UNUSED;
3223 struct insns_for_mem_entry *ifmhe;
3227 ifmhe = ((struct insns_for_mem_entry *)
3228 hash_allocate (ht, sizeof (struct insns_for_mem_entry)));
3229 ifmhe->insns = NULL_RTX;
3234 /* Return a hash value for K, a REG. */
3236 static unsigned long
3237 insns_for_mem_hash (k)
3240 /* K is really a RTX. Just use the address as the hash value. */
3241 return (unsigned long) k;
3244 /* Return non-zero if K1 and K2 (two REGs) are the same. */
3247 insns_for_mem_comp (k1, k2)
3254 struct insns_for_mem_walk_info
3256 /* The hash table that we are using to record which INSNs use which
3258 struct hash_table *ht;
3260 /* The INSN we are currently proessing. */
3263 /* Zero if we are walking to find ADDRESSOFs, one if we are walking
3264 to find the insns that use the REGs in the ADDRESSOFs. */
3268 /* Called from compute_insns_for_mem via for_each_rtx. If R is a REG
3269 that might be used in an ADDRESSOF expression, record this INSN in
3270 the hash table given by DATA (which is really a pointer to an
3271 insns_for_mem_walk_info structure). */
3274 insns_for_mem_walk (r, data)
3278 struct insns_for_mem_walk_info *ifmwi
3279 = (struct insns_for_mem_walk_info *) data;
3281 if (ifmwi->pass == 0 && *r && GET_CODE (*r) == ADDRESSOF
3282 && GET_CODE (XEXP (*r, 0)) == REG)
3283 hash_lookup (ifmwi->ht, XEXP (*r, 0), /*create=*/1, /*copy=*/0);
3284 else if (ifmwi->pass == 1 && *r && GET_CODE (*r) == REG)
3286 /* Lookup this MEM in the hashtable, creating it if necessary. */
3287 struct insns_for_mem_entry *ifme
3288 = (struct insns_for_mem_entry *) hash_lookup (ifmwi->ht,
3293 /* If we have not already recorded this INSN, do so now. Since
3294 we process the INSNs in order, we know that if we have
3295 recorded it it must be at the front of the list. */
3296 if (ifme && (!ifme->insns || XEXP (ifme->insns, 0) != ifmwi->insn))
3297 ifme->insns = gen_rtx_EXPR_LIST (VOIDmode, ifmwi->insn,
3304 /* Walk the INSNS, until we reach LAST_INSN, recording which INSNs use
3305 which REGs in HT. */
3308 compute_insns_for_mem (insns, last_insn, ht)
3311 struct hash_table *ht;
3314 struct insns_for_mem_walk_info ifmwi;
3317 for (ifmwi.pass = 0; ifmwi.pass < 2; ++ifmwi.pass)
3318 for (insn = insns; insn != last_insn; insn = NEXT_INSN (insn))
3322 for_each_rtx (&insn, insns_for_mem_walk, &ifmwi);
3326 /* Helper function for purge_addressof called through for_each_rtx.
3327 Returns true iff the rtl is an ADDRESSOF. */
3330 is_addressof (rtl, data)
3332 void *data ATTRIBUTE_UNUSED;
3334 return GET_CODE (*rtl) == ADDRESSOF;
3337 /* Eliminate all occurrences of ADDRESSOF from INSNS. Elide any remaining
3338 (MEM (ADDRESSOF)) patterns, and force any needed registers into the
3342 purge_addressof (insns)
3346 struct hash_table ht;
3348 /* When we actually purge ADDRESSOFs, we turn REGs into MEMs. That
3349 requires a fixup pass over the instruction stream to correct
3350 INSNs that depended on the REG being a REG, and not a MEM. But,
3351 these fixup passes are slow. Furthermore, most MEMs are not
3352 mentioned in very many instructions. So, we speed up the process
3353 by pre-calculating which REGs occur in which INSNs; that allows
3354 us to perform the fixup passes much more quickly. */
3355 hash_table_init (&ht,
3356 insns_for_mem_newfunc,
3358 insns_for_mem_comp);
3359 compute_insns_for_mem (insns, NULL_RTX, &ht);
3361 for (insn = insns; insn; insn = NEXT_INSN (insn))
3362 if (GET_CODE (insn) == INSN || GET_CODE (insn) == JUMP_INSN
3363 || GET_CODE (insn) == CALL_INSN)
3365 if (! purge_addressof_1 (&PATTERN (insn), insn,
3366 asm_noperands (PATTERN (insn)) > 0, 0, &ht))
3367 /* If we could not replace the ADDRESSOFs in the insn,
3368 something is wrong. */
3371 if (! purge_addressof_1 (®_NOTES (insn), NULL_RTX, 0, 0, &ht))
3373 /* If we could not replace the ADDRESSOFs in the insn's notes,
3374 we can just remove the offending notes instead. */
3377 for (note = REG_NOTES (insn); note; note = XEXP (note, 1))
3379 /* If we find a REG_RETVAL note then the insn is a libcall.
3380 Such insns must have REG_EQUAL notes as well, in order
3381 for later passes of the compiler to work. So it is not
3382 safe to delete the notes here, and instead we abort. */
3383 if (REG_NOTE_KIND (note) == REG_RETVAL)
3385 if (for_each_rtx (¬e, is_addressof, NULL))
3386 remove_note (insn, note);
3392 hash_table_free (&ht);
3393 purge_bitfield_addressof_replacements = 0;
3394 purge_addressof_replacements = 0;
3396 /* REGs are shared. purge_addressof will destructively replace a REG
3397 with a MEM, which creates shared MEMs.
3399 Unfortunately, the children of put_reg_into_stack assume that MEMs
3400 referring to the same stack slot are shared (fixup_var_refs and
3401 the associated hash table code).
3403 So, we have to do another unsharing pass after we have flushed any
3404 REGs that had their address taken into the stack.
3406 It may be worth tracking whether or not we converted any REGs into
3407 MEMs to avoid this overhead when it is not needed. */
3408 unshare_all_rtl_again (get_insns ());
3411 /* Convert a SET of a hard subreg to a set of the appropriet hard
3412 register. A subroutine of purge_hard_subreg_sets. */
3415 purge_single_hard_subreg_set (pattern)
3418 rtx reg = SET_DEST (pattern);
3419 enum machine_mode mode = GET_MODE (SET_DEST (pattern));
3422 if (GET_CODE (reg) == SUBREG && GET_CODE (SUBREG_REG (reg)) == REG
3423 && REGNO (SUBREG_REG (reg)) < FIRST_PSEUDO_REGISTER)
3425 offset = subreg_regno_offset (REGNO (SUBREG_REG (reg)),
3426 GET_MODE (SUBREG_REG (reg)),
3429 reg = SUBREG_REG (reg);
3433 if (GET_CODE (reg) == REG && REGNO (reg) < FIRST_PSEUDO_REGISTER)
3435 reg = gen_rtx_REG (mode, REGNO (reg) + offset);
3436 SET_DEST (pattern) = reg;
3440 /* Eliminate all occurrences of SETs of hard subregs from INSNS. The
3441 only such SETs that we expect to see are those left in because
3442 integrate can't handle sets of parts of a return value register.
3444 We don't use alter_subreg because we only want to eliminate subregs
3445 of hard registers. */
3448 purge_hard_subreg_sets (insn)
3451 for (; insn; insn = NEXT_INSN (insn))
3455 rtx pattern = PATTERN (insn);
3456 switch (GET_CODE (pattern))
3459 if (GET_CODE (SET_DEST (pattern)) == SUBREG)
3460 purge_single_hard_subreg_set (pattern);
3465 for (j = XVECLEN (pattern, 0) - 1; j >= 0; j--)
3467 rtx inner_pattern = XVECEXP (pattern, 0, j);
3468 if (GET_CODE (inner_pattern) == SET
3469 && GET_CODE (SET_DEST (inner_pattern)) == SUBREG)
3470 purge_single_hard_subreg_set (inner_pattern);
3481 /* Pass through the INSNS of function FNDECL and convert virtual register
3482 references to hard register references. */
3485 instantiate_virtual_regs (fndecl, insns)
3492 /* Compute the offsets to use for this function. */
3493 in_arg_offset = FIRST_PARM_OFFSET (fndecl);
3494 var_offset = STARTING_FRAME_OFFSET;
3495 dynamic_offset = STACK_DYNAMIC_OFFSET (fndecl);
3496 out_arg_offset = STACK_POINTER_OFFSET;
3497 cfa_offset = ARG_POINTER_CFA_OFFSET (fndecl);
3499 /* Scan all variables and parameters of this function. For each that is
3500 in memory, instantiate all virtual registers if the result is a valid
3501 address. If not, we do it later. That will handle most uses of virtual
3502 regs on many machines. */
3503 instantiate_decls (fndecl, 1);
3505 /* Initialize recognition, indicating that volatile is OK. */
3508 /* Scan through all the insns, instantiating every virtual register still
3510 for (insn = insns; insn; insn = NEXT_INSN (insn))
3511 if (GET_CODE (insn) == INSN || GET_CODE (insn) == JUMP_INSN
3512 || GET_CODE (insn) == CALL_INSN)
3514 instantiate_virtual_regs_1 (&PATTERN (insn), insn, 1);
3515 instantiate_virtual_regs_1 (®_NOTES (insn), NULL_RTX, 0);
3516 /* Instantiate any virtual registers in CALL_INSN_FUNCTION_USAGE. */
3517 if (GET_CODE (insn) == CALL_INSN)
3518 instantiate_virtual_regs_1 (&CALL_INSN_FUNCTION_USAGE (insn),
3522 /* Instantiate the stack slots for the parm registers, for later use in
3523 addressof elimination. */
3524 for (i = 0; i < max_parm_reg; ++i)
3525 if (parm_reg_stack_loc[i])
3526 instantiate_virtual_regs_1 (&parm_reg_stack_loc[i], NULL_RTX, 0);
3528 /* Now instantiate the remaining register equivalences for debugging info.
3529 These will not be valid addresses. */
3530 instantiate_decls (fndecl, 0);
3532 /* Indicate that, from now on, assign_stack_local should use
3533 frame_pointer_rtx. */
3534 virtuals_instantiated = 1;
3537 /* Scan all decls in FNDECL (both variables and parameters) and instantiate
3538 all virtual registers in their DECL_RTL's.
3540 If VALID_ONLY, do this only if the resulting address is still valid.
3541 Otherwise, always do it. */
3544 instantiate_decls (fndecl, valid_only)
3550 /* Process all parameters of the function. */
3551 for (decl = DECL_ARGUMENTS (fndecl); decl; decl = TREE_CHAIN (decl))
3553 HOST_WIDE_INT size = int_size_in_bytes (TREE_TYPE (decl));
3554 HOST_WIDE_INT size_rtl;
3556 instantiate_decl (DECL_RTL (decl), size, valid_only);
3558 /* If the parameter was promoted, then the incoming RTL mode may be
3559 larger than the declared type size. We must use the larger of
3561 size_rtl = GET_MODE_SIZE (GET_MODE (DECL_INCOMING_RTL (decl)));
3562 size = MAX (size_rtl, size);
3563 instantiate_decl (DECL_INCOMING_RTL (decl), size, valid_only);
3566 /* Now process all variables defined in the function or its subblocks. */
3567 instantiate_decls_1 (DECL_INITIAL (fndecl), valid_only);
3570 /* Subroutine of instantiate_decls: Process all decls in the given
3571 BLOCK node and all its subblocks. */
3574 instantiate_decls_1 (let, valid_only)
3580 for (t = BLOCK_VARS (let); t; t = TREE_CHAIN (t))
3581 if (DECL_RTL_SET_P (t))
3582 instantiate_decl (DECL_RTL (t),
3583 int_size_in_bytes (TREE_TYPE (t)),
3586 /* Process all subblocks. */
3587 for (t = BLOCK_SUBBLOCKS (let); t; t = TREE_CHAIN (t))
3588 instantiate_decls_1 (t, valid_only);
3591 /* Subroutine of the preceding procedures: Given RTL representing a
3592 decl and the size of the object, do any instantiation required.
3594 If VALID_ONLY is non-zero, it means that the RTL should only be
3595 changed if the new address is valid. */
3598 instantiate_decl (x, size, valid_only)
3603 enum machine_mode mode;
3606 /* If this is not a MEM, no need to do anything. Similarly if the
3607 address is a constant or a register that is not a virtual register. */
3609 if (x == 0 || GET_CODE (x) != MEM)
3613 if (CONSTANT_P (addr)
3614 || (GET_CODE (addr) == ADDRESSOF && GET_CODE (XEXP (addr, 0)) == REG)
3615 || (GET_CODE (addr) == REG
3616 && (REGNO (addr) < FIRST_VIRTUAL_REGISTER
3617 || REGNO (addr) > LAST_VIRTUAL_REGISTER)))
3620 /* If we should only do this if the address is valid, copy the address.
3621 We need to do this so we can undo any changes that might make the
3622 address invalid. This copy is unfortunate, but probably can't be
3626 addr = copy_rtx (addr);
3628 instantiate_virtual_regs_1 (&addr, NULL_RTX, 0);
3630 if (valid_only && size >= 0)
3632 unsigned HOST_WIDE_INT decl_size = size;
3634 /* Now verify that the resulting address is valid for every integer or
3635 floating-point mode up to and including SIZE bytes long. We do this
3636 since the object might be accessed in any mode and frame addresses
3639 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
3640 mode != VOIDmode && GET_MODE_SIZE (mode) <= decl_size;
3641 mode = GET_MODE_WIDER_MODE (mode))
3642 if (! memory_address_p (mode, addr))
3645 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
3646 mode != VOIDmode && GET_MODE_SIZE (mode) <= decl_size;
3647 mode = GET_MODE_WIDER_MODE (mode))
3648 if (! memory_address_p (mode, addr))
3652 /* Put back the address now that we have updated it and we either know
3653 it is valid or we don't care whether it is valid. */
3658 /* Given a piece of RTX and a pointer to a HOST_WIDE_INT, if the RTX
3659 is a virtual register, return the requivalent hard register and set the
3660 offset indirectly through the pointer. Otherwise, return 0. */
3663 instantiate_new_reg (x, poffset)
3665 HOST_WIDE_INT *poffset;
3668 HOST_WIDE_INT offset;
3670 if (x == virtual_incoming_args_rtx)
3671 new = arg_pointer_rtx, offset = in_arg_offset;
3672 else if (x == virtual_stack_vars_rtx)
3673 new = frame_pointer_rtx, offset = var_offset;
3674 else if (x == virtual_stack_dynamic_rtx)
3675 new = stack_pointer_rtx, offset = dynamic_offset;
3676 else if (x == virtual_outgoing_args_rtx)
3677 new = stack_pointer_rtx, offset = out_arg_offset;
3678 else if (x == virtual_cfa_rtx)
3679 new = arg_pointer_rtx, offset = cfa_offset;
3687 /* Given a pointer to a piece of rtx and an optional pointer to the
3688 containing object, instantiate any virtual registers present in it.
3690 If EXTRA_INSNS, we always do the replacement and generate
3691 any extra insns before OBJECT. If it zero, we do nothing if replacement
3694 Return 1 if we either had nothing to do or if we were able to do the
3695 needed replacement. Return 0 otherwise; we only return zero if
3696 EXTRA_INSNS is zero.
3698 We first try some simple transformations to avoid the creation of extra
3702 instantiate_virtual_regs_1 (loc, object, extra_insns)
3710 HOST_WIDE_INT offset = 0;
3716 /* Re-start here to avoid recursion in common cases. */
3723 code = GET_CODE (x);
3725 /* Check for some special cases. */
3742 /* We are allowed to set the virtual registers. This means that
3743 the actual register should receive the source minus the
3744 appropriate offset. This is used, for example, in the handling
3745 of non-local gotos. */
3746 if ((new = instantiate_new_reg (SET_DEST (x), &offset)) != 0)
3748 rtx src = SET_SRC (x);
3750 /* We are setting the register, not using it, so the relevant
3751 offset is the negative of the offset to use were we using
3754 instantiate_virtual_regs_1 (&src, NULL_RTX, 0);
3756 /* The only valid sources here are PLUS or REG. Just do
3757 the simplest possible thing to handle them. */
3758 if (GET_CODE (src) != REG && GET_CODE (src) != PLUS)
3762 if (GET_CODE (src) != REG)
3763 temp = force_operand (src, NULL_RTX);
3766 temp = force_operand (plus_constant (temp, offset), NULL_RTX);
3770 emit_insns_before (seq, object);
3773 if (! validate_change (object, &SET_SRC (x), temp, 0)
3780 instantiate_virtual_regs_1 (&SET_DEST (x), object, extra_insns);
3785 /* Handle special case of virtual register plus constant. */
3786 if (CONSTANT_P (XEXP (x, 1)))
3788 rtx old, new_offset;
3790 /* Check for (plus (plus VIRT foo) (const_int)) first. */
3791 if (GET_CODE (XEXP (x, 0)) == PLUS)
3793 if ((new = instantiate_new_reg (XEXP (XEXP (x, 0), 0), &offset)))
3795 instantiate_virtual_regs_1 (&XEXP (XEXP (x, 0), 1), object,
3797 new = gen_rtx_PLUS (Pmode, new, XEXP (XEXP (x, 0), 1));
3806 #ifdef POINTERS_EXTEND_UNSIGNED
3807 /* If we have (plus (subreg (virtual-reg)) (const_int)), we know
3808 we can commute the PLUS and SUBREG because pointers into the
3809 frame are well-behaved. */
3810 else if (GET_CODE (XEXP (x, 0)) == SUBREG && GET_MODE (x) == ptr_mode
3811 && GET_CODE (XEXP (x, 1)) == CONST_INT
3813 = instantiate_new_reg (SUBREG_REG (XEXP (x, 0)),
3815 && validate_change (object, loc,
3816 plus_constant (gen_lowpart (ptr_mode,
3819 + INTVAL (XEXP (x, 1))),
3823 else if ((new = instantiate_new_reg (XEXP (x, 0), &offset)) == 0)
3825 /* We know the second operand is a constant. Unless the
3826 first operand is a REG (which has been already checked),
3827 it needs to be checked. */
3828 if (GET_CODE (XEXP (x, 0)) != REG)
3836 new_offset = plus_constant (XEXP (x, 1), offset);
3838 /* If the new constant is zero, try to replace the sum with just
3840 if (new_offset == const0_rtx
3841 && validate_change (object, loc, new, 0))
3844 /* Next try to replace the register and new offset.
3845 There are two changes to validate here and we can't assume that
3846 in the case of old offset equals new just changing the register
3847 will yield a valid insn. In the interests of a little efficiency,
3848 however, we only call validate change once (we don't queue up the
3849 changes and then call apply_change_group). */
3853 ? ! validate_change (object, &XEXP (x, 0), new, 0)
3854 : (XEXP (x, 0) = new,
3855 ! validate_change (object, &XEXP (x, 1), new_offset, 0)))
3863 /* Otherwise copy the new constant into a register and replace
3864 constant with that register. */
3865 temp = gen_reg_rtx (Pmode);
3867 if (validate_change (object, &XEXP (x, 1), temp, 0))
3868 emit_insn_before (gen_move_insn (temp, new_offset), object);
3871 /* If that didn't work, replace this expression with a
3872 register containing the sum. */
3875 new = gen_rtx_PLUS (Pmode, new, new_offset);
3878 temp = force_operand (new, NULL_RTX);
3882 emit_insns_before (seq, object);
3883 if (! validate_change (object, loc, temp, 0)
3884 && ! validate_replace_rtx (x, temp, object))
3892 /* Fall through to generic two-operand expression case. */
3898 case DIV: case UDIV:
3899 case MOD: case UMOD:
3900 case AND: case IOR: case XOR:
3901 case ROTATERT: case ROTATE:
3902 case ASHIFTRT: case LSHIFTRT: case ASHIFT:
3904 case GE: case GT: case GEU: case GTU:
3905 case LE: case LT: case LEU: case LTU:
3906 if (XEXP (x, 1) && ! CONSTANT_P (XEXP (x, 1)))
3907 instantiate_virtual_regs_1 (&XEXP (x, 1), object, extra_insns);
3912 /* Most cases of MEM that convert to valid addresses have already been
3913 handled by our scan of decls. The only special handling we
3914 need here is to make a copy of the rtx to ensure it isn't being
3915 shared if we have to change it to a pseudo.
3917 If the rtx is a simple reference to an address via a virtual register,
3918 it can potentially be shared. In such cases, first try to make it
3919 a valid address, which can also be shared. Otherwise, copy it and
3922 First check for common cases that need no processing. These are
3923 usually due to instantiation already being done on a previous instance
3927 if (CONSTANT_ADDRESS_P (temp)
3928 #if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
3929 || temp == arg_pointer_rtx
3931 #if HARD_FRAME_POINTER_REGNUM != FRAME_POINTER_REGNUM
3932 || temp == hard_frame_pointer_rtx
3934 || temp == frame_pointer_rtx)
3937 if (GET_CODE (temp) == PLUS
3938 && CONSTANT_ADDRESS_P (XEXP (temp, 1))
3939 && (XEXP (temp, 0) == frame_pointer_rtx
3940 #if HARD_FRAME_POINTER_REGNUM != FRAME_POINTER_REGNUM
3941 || XEXP (temp, 0) == hard_frame_pointer_rtx
3943 #if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
3944 || XEXP (temp, 0) == arg_pointer_rtx
3949 if (temp == virtual_stack_vars_rtx
3950 || temp == virtual_incoming_args_rtx
3951 || (GET_CODE (temp) == PLUS
3952 && CONSTANT_ADDRESS_P (XEXP (temp, 1))
3953 && (XEXP (temp, 0) == virtual_stack_vars_rtx
3954 || XEXP (temp, 0) == virtual_incoming_args_rtx)))
3956 /* This MEM may be shared. If the substitution can be done without
3957 the need to generate new pseudos, we want to do it in place
3958 so all copies of the shared rtx benefit. The call below will
3959 only make substitutions if the resulting address is still
3962 Note that we cannot pass X as the object in the recursive call
3963 since the insn being processed may not allow all valid
3964 addresses. However, if we were not passed on object, we can
3965 only modify X without copying it if X will have a valid
3968 ??? Also note that this can still lose if OBJECT is an insn that
3969 has less restrictions on an address that some other insn.
3970 In that case, we will modify the shared address. This case
3971 doesn't seem very likely, though. One case where this could
3972 happen is in the case of a USE or CLOBBER reference, but we
3973 take care of that below. */
3975 if (instantiate_virtual_regs_1 (&XEXP (x, 0),
3976 object ? object : x, 0))
3979 /* Otherwise make a copy and process that copy. We copy the entire
3980 RTL expression since it might be a PLUS which could also be
3982 *loc = x = copy_rtx (x);
3985 /* Fall through to generic unary operation case. */
3987 case STRICT_LOW_PART:
3989 case PRE_DEC: case PRE_INC: case POST_DEC: case POST_INC:
3990 case SIGN_EXTEND: case ZERO_EXTEND:
3991 case TRUNCATE: case FLOAT_EXTEND: case FLOAT_TRUNCATE:
3992 case FLOAT: case FIX:
3993 case UNSIGNED_FIX: case UNSIGNED_FLOAT:
3997 /* These case either have just one operand or we know that we need not
3998 check the rest of the operands. */
4004 /* If the operand is a MEM, see if the change is a valid MEM. If not,
4005 go ahead and make the invalid one, but do it to a copy. For a REG,
4006 just make the recursive call, since there's no chance of a problem. */
4008 if ((GET_CODE (XEXP (x, 0)) == MEM
4009 && instantiate_virtual_regs_1 (&XEXP (XEXP (x, 0), 0), XEXP (x, 0),
4011 || (GET_CODE (XEXP (x, 0)) == REG
4012 && instantiate_virtual_regs_1 (&XEXP (x, 0), object, 0)))
4015 XEXP (x, 0) = copy_rtx (XEXP (x, 0));
4020 /* Try to replace with a PLUS. If that doesn't work, compute the sum
4021 in front of this insn and substitute the temporary. */
4022 if ((new = instantiate_new_reg (x, &offset)) != 0)
4024 temp = plus_constant (new, offset);
4025 if (!validate_change (object, loc, temp, 0))
4031 temp = force_operand (temp, NULL_RTX);
4035 emit_insns_before (seq, object);
4036 if (! validate_change (object, loc, temp, 0)
4037 && ! validate_replace_rtx (x, temp, object))
4045 if (GET_CODE (XEXP (x, 0)) == REG)
4048 else if (GET_CODE (XEXP (x, 0)) == MEM)
4050 /* If we have a (addressof (mem ..)), do any instantiation inside
4051 since we know we'll be making the inside valid when we finally
4052 remove the ADDRESSOF. */
4053 instantiate_virtual_regs_1 (&XEXP (XEXP (x, 0), 0), NULL_RTX, 0);
4062 /* Scan all subexpressions. */
4063 fmt = GET_RTX_FORMAT (code);
4064 for (i = 0; i < GET_RTX_LENGTH (code); i++, fmt++)
4067 if (!instantiate_virtual_regs_1 (&XEXP (x, i), object, extra_insns))
4070 else if (*fmt == 'E')
4071 for (j = 0; j < XVECLEN (x, i); j++)
4072 if (! instantiate_virtual_regs_1 (&XVECEXP (x, i, j), object,
4079 /* Optimization: assuming this function does not receive nonlocal gotos,
4080 delete the handlers for such, as well as the insns to establish
4081 and disestablish them. */
4087 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
4089 /* Delete the handler by turning off the flag that would
4090 prevent jump_optimize from deleting it.
4091 Also permit deletion of the nonlocal labels themselves
4092 if nothing local refers to them. */
4093 if (GET_CODE (insn) == CODE_LABEL)
4097 LABEL_PRESERVE_P (insn) = 0;
4099 /* Remove it from the nonlocal_label list, to avoid confusing
4101 for (t = nonlocal_labels, last_t = 0; t;
4102 last_t = t, t = TREE_CHAIN (t))
4103 if (DECL_RTL (TREE_VALUE (t)) == insn)
4108 nonlocal_labels = TREE_CHAIN (nonlocal_labels);
4110 TREE_CHAIN (last_t) = TREE_CHAIN (t);
4113 if (GET_CODE (insn) == INSN)
4117 for (t = nonlocal_goto_handler_slots; t != 0; t = XEXP (t, 1))
4118 if (reg_mentioned_p (t, PATTERN (insn)))
4124 || (nonlocal_goto_stack_level != 0
4125 && reg_mentioned_p (nonlocal_goto_stack_level,
4127 delete_related_insns (insn);
4135 return max_parm_reg;
4138 /* Return the first insn following those generated by `assign_parms'. */
4141 get_first_nonparm_insn ()
4144 return NEXT_INSN (last_parm_insn);
4145 return get_insns ();
4148 /* Return the first NOTE_INSN_BLOCK_BEG note in the function.
4149 Crash if there is none. */
4152 get_first_block_beg ()
4155 rtx insn = get_first_nonparm_insn ();
4157 for (searcher = insn; searcher; searcher = NEXT_INSN (searcher))
4158 if (GET_CODE (searcher) == NOTE
4159 && NOTE_LINE_NUMBER (searcher) == NOTE_INSN_BLOCK_BEG)
4162 abort (); /* Invalid call to this function. (See comments above.) */
4166 /* Return 1 if EXP is an aggregate type (or a value with aggregate type).
4167 This means a type for which function calls must pass an address to the
4168 function or get an address back from the function.
4169 EXP may be a type node or an expression (whose type is tested). */
4172 aggregate_value_p (exp)
4175 int i, regno, nregs;
4178 tree type = (TYPE_P (exp)) ? exp : TREE_TYPE (exp);
4180 if (TREE_CODE (type) == VOID_TYPE)
4182 if (RETURN_IN_MEMORY (type))
4184 /* Types that are TREE_ADDRESSABLE must be constructed in memory,
4185 and thus can't be returned in registers. */
4186 if (TREE_ADDRESSABLE (type))
4188 if (flag_pcc_struct_return && AGGREGATE_TYPE_P (type))
4190 /* Make sure we have suitable call-clobbered regs to return
4191 the value in; if not, we must return it in memory. */
4192 reg = hard_function_value (type, 0, 0);
4194 /* If we have something other than a REG (e.g. a PARALLEL), then assume
4196 if (GET_CODE (reg) != REG)
4199 regno = REGNO (reg);
4200 nregs = HARD_REGNO_NREGS (regno, TYPE_MODE (type));
4201 for (i = 0; i < nregs; i++)
4202 if (! call_used_regs[regno + i])
4207 /* Assign RTL expressions to the function's parameters.
4208 This may involve copying them into registers and using
4209 those registers as the RTL for them. */
4212 assign_parms (fndecl)
4218 CUMULATIVE_ARGS args_so_far;
4219 enum machine_mode promoted_mode, passed_mode;
4220 enum machine_mode nominal_mode, promoted_nominal_mode;
4222 /* Total space needed so far for args on the stack,
4223 given as a constant and a tree-expression. */
4224 struct args_size stack_args_size;
4225 tree fntype = TREE_TYPE (fndecl);
4226 tree fnargs = DECL_ARGUMENTS (fndecl);
4227 /* This is used for the arg pointer when referring to stack args. */
4228 rtx internal_arg_pointer;
4229 /* This is a dummy PARM_DECL that we used for the function result if
4230 the function returns a structure. */
4231 tree function_result_decl = 0;
4232 #ifdef SETUP_INCOMING_VARARGS
4233 int varargs_setup = 0;
4235 rtx conversion_insns = 0;
4236 struct args_size alignment_pad;
4238 /* Nonzero if the last arg is named `__builtin_va_alist',
4239 which is used on some machines for old-fashioned non-ANSI varargs.h;
4240 this should be stuck onto the stack as if it had arrived there. */
4242 = (current_function_varargs
4244 && (parm = tree_last (fnargs)) != 0
4246 && (! strcmp (IDENTIFIER_POINTER (DECL_NAME (parm)),
4247 "__builtin_va_alist")));
4249 /* Nonzero if function takes extra anonymous args.
4250 This means the last named arg must be on the stack
4251 right before the anonymous ones. */
4253 = (TYPE_ARG_TYPES (fntype) != 0
4254 && (TREE_VALUE (tree_last (TYPE_ARG_TYPES (fntype)))
4255 != void_type_node));
4257 current_function_stdarg = stdarg;
4259 /* If the reg that the virtual arg pointer will be translated into is
4260 not a fixed reg or is the stack pointer, make a copy of the virtual
4261 arg pointer, and address parms via the copy. The frame pointer is
4262 considered fixed even though it is not marked as such.
4264 The second time through, simply use ap to avoid generating rtx. */
4266 if ((ARG_POINTER_REGNUM == STACK_POINTER_REGNUM
4267 || ! (fixed_regs[ARG_POINTER_REGNUM]
4268 || ARG_POINTER_REGNUM == FRAME_POINTER_REGNUM)))
4269 internal_arg_pointer = copy_to_reg (virtual_incoming_args_rtx);
4271 internal_arg_pointer = virtual_incoming_args_rtx;
4272 current_function_internal_arg_pointer = internal_arg_pointer;
4274 stack_args_size.constant = 0;
4275 stack_args_size.var = 0;
4277 /* If struct value address is treated as the first argument, make it so. */
4278 if (aggregate_value_p (DECL_RESULT (fndecl))
4279 && ! current_function_returns_pcc_struct
4280 && struct_value_incoming_rtx == 0)
4282 tree type = build_pointer_type (TREE_TYPE (fntype));
4284 function_result_decl = build_decl (PARM_DECL, NULL_TREE, type);
4286 DECL_ARG_TYPE (function_result_decl) = type;
4287 TREE_CHAIN (function_result_decl) = fnargs;
4288 fnargs = function_result_decl;
4291 max_parm_reg = LAST_VIRTUAL_REGISTER + 1;
4292 parm_reg_stack_loc = (rtx *) xcalloc (max_parm_reg, sizeof (rtx));
4294 #ifdef INIT_CUMULATIVE_INCOMING_ARGS
4295 INIT_CUMULATIVE_INCOMING_ARGS (args_so_far, fntype, NULL_RTX);
4297 INIT_CUMULATIVE_ARGS (args_so_far, fntype, NULL_RTX, 0);
4300 /* We haven't yet found an argument that we must push and pretend the
4302 current_function_pretend_args_size = 0;
4304 for (parm = fnargs; parm; parm = TREE_CHAIN (parm))
4306 struct args_size stack_offset;
4307 struct args_size arg_size;
4308 int passed_pointer = 0;
4309 int did_conversion = 0;
4310 tree passed_type = DECL_ARG_TYPE (parm);
4311 tree nominal_type = TREE_TYPE (parm);
4314 /* Set LAST_NAMED if this is last named arg before some
4316 int last_named = ((TREE_CHAIN (parm) == 0
4317 || DECL_NAME (TREE_CHAIN (parm)) == 0)
4318 && (stdarg || current_function_varargs));
4319 /* Set NAMED_ARG if this arg should be treated as a named arg. For
4320 most machines, if this is a varargs/stdarg function, then we treat
4321 the last named arg as if it were anonymous too. */
4322 int named_arg = STRICT_ARGUMENT_NAMING ? 1 : ! last_named;
4324 if (TREE_TYPE (parm) == error_mark_node
4325 /* This can happen after weird syntax errors
4326 or if an enum type is defined among the parms. */
4327 || TREE_CODE (parm) != PARM_DECL
4328 || passed_type == NULL)
4330 SET_DECL_RTL (parm, gen_rtx_MEM (BLKmode, const0_rtx));
4331 DECL_INCOMING_RTL (parm) = DECL_RTL (parm);
4332 TREE_USED (parm) = 1;
4336 /* For varargs.h function, save info about regs and stack space
4337 used by the individual args, not including the va_alist arg. */
4338 if (hide_last_arg && last_named)
4339 current_function_args_info = args_so_far;
4341 /* Find mode of arg as it is passed, and mode of arg
4342 as it should be during execution of this function. */
4343 passed_mode = TYPE_MODE (passed_type);
4344 nominal_mode = TYPE_MODE (nominal_type);
4346 /* If the parm's mode is VOID, its value doesn't matter,
4347 and avoid the usual things like emit_move_insn that could crash. */
4348 if (nominal_mode == VOIDmode)
4350 SET_DECL_RTL (parm, const0_rtx);
4351 DECL_INCOMING_RTL (parm) = DECL_RTL (parm);
4355 /* If the parm is to be passed as a transparent union, use the
4356 type of the first field for the tests below. We have already
4357 verified that the modes are the same. */
4358 if (DECL_TRANSPARENT_UNION (parm)
4359 || (TREE_CODE (passed_type) == UNION_TYPE
4360 && TYPE_TRANSPARENT_UNION (passed_type)))
4361 passed_type = TREE_TYPE (TYPE_FIELDS (passed_type));
4363 /* See if this arg was passed by invisible reference. It is if
4364 it is an object whose size depends on the contents of the
4365 object itself or if the machine requires these objects be passed
4368 if ((TREE_CODE (TYPE_SIZE (passed_type)) != INTEGER_CST
4369 && contains_placeholder_p (TYPE_SIZE (passed_type)))
4370 || TREE_ADDRESSABLE (passed_type)
4371 #ifdef FUNCTION_ARG_PASS_BY_REFERENCE
4372 || FUNCTION_ARG_PASS_BY_REFERENCE (args_so_far, passed_mode,
4373 passed_type, named_arg)
4377 passed_type = nominal_type = build_pointer_type (passed_type);
4379 passed_mode = nominal_mode = Pmode;
4382 promoted_mode = passed_mode;
4384 #ifdef PROMOTE_FUNCTION_ARGS
4385 /* Compute the mode in which the arg is actually extended to. */
4386 unsignedp = TREE_UNSIGNED (passed_type);
4387 promoted_mode = promote_mode (passed_type, promoted_mode, &unsignedp, 1);
4390 /* Let machine desc say which reg (if any) the parm arrives in.
4391 0 means it arrives on the stack. */
4392 #ifdef FUNCTION_INCOMING_ARG
4393 entry_parm = FUNCTION_INCOMING_ARG (args_so_far, promoted_mode,
4394 passed_type, named_arg);
4396 entry_parm = FUNCTION_ARG (args_so_far, promoted_mode,
4397 passed_type, named_arg);
4400 if (entry_parm == 0)
4401 promoted_mode = passed_mode;
4403 #ifdef SETUP_INCOMING_VARARGS
4404 /* If this is the last named parameter, do any required setup for
4405 varargs or stdargs. We need to know about the case of this being an
4406 addressable type, in which case we skip the registers it
4407 would have arrived in.
4409 For stdargs, LAST_NAMED will be set for two parameters, the one that
4410 is actually the last named, and the dummy parameter. We only
4411 want to do this action once.
4413 Also, indicate when RTL generation is to be suppressed. */
4414 if (last_named && !varargs_setup)
4416 SETUP_INCOMING_VARARGS (args_so_far, promoted_mode, passed_type,
4417 current_function_pretend_args_size, 0);
4422 /* Determine parm's home in the stack,
4423 in case it arrives in the stack or we should pretend it did.
4425 Compute the stack position and rtx where the argument arrives
4428 There is one complexity here: If this was a parameter that would
4429 have been passed in registers, but wasn't only because it is
4430 __builtin_va_alist, we want locate_and_pad_parm to treat it as if
4431 it came in a register so that REG_PARM_STACK_SPACE isn't skipped.
4432 In this case, we call FUNCTION_ARG with NAMED set to 1 instead of
4433 0 as it was the previous time. */
4435 pretend_named = named_arg || PRETEND_OUTGOING_VARARGS_NAMED;
4436 locate_and_pad_parm (promoted_mode, passed_type,
4437 #ifdef STACK_PARMS_IN_REG_PARM_AREA
4440 #ifdef FUNCTION_INCOMING_ARG
4441 FUNCTION_INCOMING_ARG (args_so_far, promoted_mode,
4443 pretend_named) != 0,
4445 FUNCTION_ARG (args_so_far, promoted_mode,
4447 pretend_named) != 0,
4450 fndecl, &stack_args_size, &stack_offset, &arg_size,
4454 rtx offset_rtx = ARGS_SIZE_RTX (stack_offset);
4456 if (offset_rtx == const0_rtx)
4457 stack_parm = gen_rtx_MEM (promoted_mode, internal_arg_pointer);
4459 stack_parm = gen_rtx_MEM (promoted_mode,
4460 gen_rtx_PLUS (Pmode,
4461 internal_arg_pointer,
4464 set_mem_attributes (stack_parm, parm, 1);
4467 /* If this parameter was passed both in registers and in the stack,
4468 use the copy on the stack. */
4469 if (MUST_PASS_IN_STACK (promoted_mode, passed_type))
4472 #ifdef FUNCTION_ARG_PARTIAL_NREGS
4473 /* If this parm was passed part in regs and part in memory,
4474 pretend it arrived entirely in memory
4475 by pushing the register-part onto the stack.
4477 In the special case of a DImode or DFmode that is split,
4478 we could put it together in a pseudoreg directly,
4479 but for now that's not worth bothering with. */
4483 int nregs = FUNCTION_ARG_PARTIAL_NREGS (args_so_far, promoted_mode,
4484 passed_type, named_arg);
4488 current_function_pretend_args_size
4489 = (((nregs * UNITS_PER_WORD) + (PARM_BOUNDARY / BITS_PER_UNIT) - 1)
4490 / (PARM_BOUNDARY / BITS_PER_UNIT)
4491 * (PARM_BOUNDARY / BITS_PER_UNIT));
4493 /* Handle calls that pass values in multiple non-contiguous
4494 locations. The Irix 6 ABI has examples of this. */
4495 if (GET_CODE (entry_parm) == PARALLEL)
4496 emit_group_store (validize_mem (stack_parm), entry_parm,
4497 int_size_in_bytes (TREE_TYPE (parm)),
4498 TYPE_ALIGN (TREE_TYPE (parm)));
4501 move_block_from_reg (REGNO (entry_parm),
4502 validize_mem (stack_parm), nregs,
4503 int_size_in_bytes (TREE_TYPE (parm)));
4505 entry_parm = stack_parm;
4510 /* If we didn't decide this parm came in a register,
4511 by default it came on the stack. */
4512 if (entry_parm == 0)
4513 entry_parm = stack_parm;
4515 /* Record permanently how this parm was passed. */
4516 DECL_INCOMING_RTL (parm) = entry_parm;
4518 /* If there is actually space on the stack for this parm,
4519 count it in stack_args_size; otherwise set stack_parm to 0
4520 to indicate there is no preallocated stack slot for the parm. */
4522 if (entry_parm == stack_parm
4523 || (GET_CODE (entry_parm) == PARALLEL
4524 && XEXP (XVECEXP (entry_parm, 0, 0), 0) == NULL_RTX)
4525 #if defined (REG_PARM_STACK_SPACE) && ! defined (MAYBE_REG_PARM_STACK_SPACE)
4526 /* On some machines, even if a parm value arrives in a register
4527 there is still an (uninitialized) stack slot allocated for it.
4529 ??? When MAYBE_REG_PARM_STACK_SPACE is defined, we can't tell
4530 whether this parameter already has a stack slot allocated,
4531 because an arg block exists only if current_function_args_size
4532 is larger than some threshold, and we haven't calculated that
4533 yet. So, for now, we just assume that stack slots never exist
4535 || REG_PARM_STACK_SPACE (fndecl) > 0
4539 stack_args_size.constant += arg_size.constant;
4541 ADD_PARM_SIZE (stack_args_size, arg_size.var);
4544 /* No stack slot was pushed for this parm. */
4547 /* Update info on where next arg arrives in registers. */
4549 FUNCTION_ARG_ADVANCE (args_so_far, promoted_mode,
4550 passed_type, named_arg);
4552 /* If we can't trust the parm stack slot to be aligned enough
4553 for its ultimate type, don't use that slot after entry.
4554 We'll make another stack slot, if we need one. */
4556 unsigned int thisparm_boundary
4557 = FUNCTION_ARG_BOUNDARY (promoted_mode, passed_type);
4559 if (GET_MODE_ALIGNMENT (nominal_mode) > thisparm_boundary)
4563 /* If parm was passed in memory, and we need to convert it on entry,
4564 don't store it back in that same slot. */
4566 && nominal_mode != BLKmode && nominal_mode != passed_mode)
4569 /* When an argument is passed in multiple locations, we can't
4570 make use of this information, but we can save some copying if
4571 the whole argument is passed in a single register. */
4572 if (GET_CODE (entry_parm) == PARALLEL
4573 && nominal_mode != BLKmode && passed_mode != BLKmode)
4575 int i, len = XVECLEN (entry_parm, 0);
4577 for (i = 0; i < len; i++)
4578 if (XEXP (XVECEXP (entry_parm, 0, i), 0) != NULL_RTX
4579 && GET_CODE (XEXP (XVECEXP (entry_parm, 0, i), 0)) == REG
4580 && (GET_MODE (XEXP (XVECEXP (entry_parm, 0, i), 0))
4582 && INTVAL (XEXP (XVECEXP (entry_parm, 0, i), 1)) == 0)
4584 entry_parm = XEXP (XVECEXP (entry_parm, 0, i), 0);
4585 DECL_INCOMING_RTL (parm) = entry_parm;
4590 /* ENTRY_PARM is an RTX for the parameter as it arrives,
4591 in the mode in which it arrives.
4592 STACK_PARM is an RTX for a stack slot where the parameter can live
4593 during the function (in case we want to put it there).
4594 STACK_PARM is 0 if no stack slot was pushed for it.
4596 Now output code if necessary to convert ENTRY_PARM to
4597 the type in which this function declares it,
4598 and store that result in an appropriate place,
4599 which may be a pseudo reg, may be STACK_PARM,
4600 or may be a local stack slot if STACK_PARM is 0.
4602 Set DECL_RTL to that place. */
4604 if (nominal_mode == BLKmode || GET_CODE (entry_parm) == PARALLEL)
4606 /* If a BLKmode arrives in registers, copy it to a stack slot.
4607 Handle calls that pass values in multiple non-contiguous
4608 locations. The Irix 6 ABI has examples of this. */
4609 if (GET_CODE (entry_parm) == REG
4610 || GET_CODE (entry_parm) == PARALLEL)
4613 = CEIL_ROUND (int_size_in_bytes (TREE_TYPE (parm)),
4616 /* Note that we will be storing an integral number of words.
4617 So we have to be careful to ensure that we allocate an
4618 integral number of words. We do this below in the
4619 assign_stack_local if space was not allocated in the argument
4620 list. If it was, this will not work if PARM_BOUNDARY is not
4621 a multiple of BITS_PER_WORD. It isn't clear how to fix this
4622 if it becomes a problem. */
4624 if (stack_parm == 0)
4627 = assign_stack_local (GET_MODE (entry_parm),
4629 set_mem_attributes (stack_parm, parm, 1);
4632 else if (PARM_BOUNDARY % BITS_PER_WORD != 0)
4635 /* Handle calls that pass values in multiple non-contiguous
4636 locations. The Irix 6 ABI has examples of this. */
4637 if (GET_CODE (entry_parm) == PARALLEL)
4638 emit_group_store (validize_mem (stack_parm), entry_parm,
4639 int_size_in_bytes (TREE_TYPE (parm)),
4640 TYPE_ALIGN (TREE_TYPE (parm)));
4642 move_block_from_reg (REGNO (entry_parm),
4643 validize_mem (stack_parm),
4644 size_stored / UNITS_PER_WORD,
4645 int_size_in_bytes (TREE_TYPE (parm)));
4647 SET_DECL_RTL (parm, stack_parm);
4649 else if (! ((! optimize
4650 && ! DECL_REGISTER (parm)
4651 && ! DECL_INLINE (fndecl))
4652 || TREE_SIDE_EFFECTS (parm)
4653 /* If -ffloat-store specified, don't put explicit
4654 float variables into registers. */
4655 || (flag_float_store
4656 && TREE_CODE (TREE_TYPE (parm)) == REAL_TYPE))
4657 /* Always assign pseudo to structure return or item passed
4658 by invisible reference. */
4659 || passed_pointer || parm == function_result_decl)
4661 /* Store the parm in a pseudoregister during the function, but we
4662 may need to do it in a wider mode. */
4665 unsigned int regno, regnoi = 0, regnor = 0;
4667 unsignedp = TREE_UNSIGNED (TREE_TYPE (parm));
4669 promoted_nominal_mode
4670 = promote_mode (TREE_TYPE (parm), nominal_mode, &unsignedp, 0);
4672 parmreg = gen_reg_rtx (promoted_nominal_mode);
4673 mark_user_reg (parmreg);
4675 /* If this was an item that we received a pointer to, set DECL_RTL
4679 rtx x = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (passed_type)),
4681 set_mem_attributes (x, parm, 1);
4682 SET_DECL_RTL (parm, x);
4686 SET_DECL_RTL (parm, parmreg);
4687 maybe_set_unchanging (DECL_RTL (parm), parm);
4690 /* Copy the value into the register. */
4691 if (nominal_mode != passed_mode
4692 || promoted_nominal_mode != promoted_mode)
4695 /* ENTRY_PARM has been converted to PROMOTED_MODE, its
4696 mode, by the caller. We now have to convert it to
4697 NOMINAL_MODE, if different. However, PARMREG may be in
4698 a different mode than NOMINAL_MODE if it is being stored
4701 If ENTRY_PARM is a hard register, it might be in a register
4702 not valid for operating in its mode (e.g., an odd-numbered
4703 register for a DFmode). In that case, moves are the only
4704 thing valid, so we can't do a convert from there. This
4705 occurs when the calling sequence allow such misaligned
4708 In addition, the conversion may involve a call, which could
4709 clobber parameters which haven't been copied to pseudo
4710 registers yet. Therefore, we must first copy the parm to
4711 a pseudo reg here, and save the conversion until after all
4712 parameters have been moved. */
4714 rtx tempreg = gen_reg_rtx (GET_MODE (entry_parm));
4716 emit_move_insn (tempreg, validize_mem (entry_parm));
4718 push_to_sequence (conversion_insns);
4719 tempreg = convert_to_mode (nominal_mode, tempreg, unsignedp);
4721 if (GET_CODE (tempreg) == SUBREG
4722 && GET_MODE (tempreg) == nominal_mode
4723 && GET_CODE (SUBREG_REG (tempreg)) == REG
4724 && nominal_mode == passed_mode
4725 && GET_MODE (SUBREG_REG (tempreg)) == GET_MODE (entry_parm)
4726 && GET_MODE_SIZE (GET_MODE (tempreg))
4727 < GET_MODE_SIZE (GET_MODE (entry_parm)))
4729 /* The argument is already sign/zero extended, so note it
4731 SUBREG_PROMOTED_VAR_P (tempreg) = 1;
4732 SUBREG_PROMOTED_UNSIGNED_P (tempreg) = unsignedp;
4735 /* TREE_USED gets set erroneously during expand_assignment. */
4736 save_tree_used = TREE_USED (parm);
4737 expand_assignment (parm,
4738 make_tree (nominal_type, tempreg), 0, 0);
4739 TREE_USED (parm) = save_tree_used;
4740 conversion_insns = get_insns ();
4745 emit_move_insn (parmreg, validize_mem (entry_parm));
4747 /* If we were passed a pointer but the actual value
4748 can safely live in a register, put it in one. */
4749 if (passed_pointer && TYPE_MODE (TREE_TYPE (parm)) != BLKmode
4751 && ! DECL_REGISTER (parm)
4752 && ! DECL_INLINE (fndecl))
4753 || TREE_SIDE_EFFECTS (parm)
4754 /* If -ffloat-store specified, don't put explicit
4755 float variables into registers. */
4756 || (flag_float_store
4757 && TREE_CODE (TREE_TYPE (parm)) == REAL_TYPE)))
4759 /* We can't use nominal_mode, because it will have been set to
4760 Pmode above. We must use the actual mode of the parm. */
4761 parmreg = gen_reg_rtx (TYPE_MODE (TREE_TYPE (parm)));
4762 mark_user_reg (parmreg);
4763 if (GET_MODE (parmreg) != GET_MODE (DECL_RTL (parm)))
4765 rtx tempreg = gen_reg_rtx (GET_MODE (DECL_RTL (parm)));
4766 int unsigned_p = TREE_UNSIGNED (TREE_TYPE (parm));
4767 push_to_sequence (conversion_insns);
4768 emit_move_insn (tempreg, DECL_RTL (parm));
4770 convert_to_mode (GET_MODE (parmreg),
4773 emit_move_insn (parmreg, DECL_RTL (parm));
4774 conversion_insns = get_insns();
4779 emit_move_insn (parmreg, DECL_RTL (parm));
4780 SET_DECL_RTL (parm, parmreg);
4781 /* STACK_PARM is the pointer, not the parm, and PARMREG is
4785 #ifdef FUNCTION_ARG_CALLEE_COPIES
4786 /* If we are passed an arg by reference and it is our responsibility
4787 to make a copy, do it now.
4788 PASSED_TYPE and PASSED mode now refer to the pointer, not the
4789 original argument, so we must recreate them in the call to
4790 FUNCTION_ARG_CALLEE_COPIES. */
4791 /* ??? Later add code to handle the case that if the argument isn't
4792 modified, don't do the copy. */
4794 else if (passed_pointer
4795 && FUNCTION_ARG_CALLEE_COPIES (args_so_far,
4796 TYPE_MODE (DECL_ARG_TYPE (parm)),
4797 DECL_ARG_TYPE (parm),
4799 && ! TREE_ADDRESSABLE (DECL_ARG_TYPE (parm)))
4802 tree type = DECL_ARG_TYPE (parm);
4804 /* This sequence may involve a library call perhaps clobbering
4805 registers that haven't been copied to pseudos yet. */
4807 push_to_sequence (conversion_insns);
4809 if (!COMPLETE_TYPE_P (type)
4810 || TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST)
4811 /* This is a variable sized object. */
4812 copy = gen_rtx_MEM (BLKmode,
4813 allocate_dynamic_stack_space
4814 (expr_size (parm), NULL_RTX,
4815 TYPE_ALIGN (type)));
4817 copy = assign_stack_temp (TYPE_MODE (type),
4818 int_size_in_bytes (type), 1);
4819 set_mem_attributes (copy, parm, 1);
4821 store_expr (parm, copy, 0);
4822 emit_move_insn (parmreg, XEXP (copy, 0));
4823 if (current_function_check_memory_usage)
4824 emit_library_call (chkr_set_right_libfunc,
4825 LCT_CONST_MAKE_BLOCK, VOIDmode, 3,
4826 XEXP (copy, 0), Pmode,
4827 GEN_INT (int_size_in_bytes (type)),
4828 TYPE_MODE (sizetype),
4829 GEN_INT (MEMORY_USE_RW),
4830 TYPE_MODE (integer_type_node));
4831 conversion_insns = get_insns ();
4835 #endif /* FUNCTION_ARG_CALLEE_COPIES */
4837 /* In any case, record the parm's desired stack location
4838 in case we later discover it must live in the stack.
4840 If it is a COMPLEX value, store the stack location for both
4843 if (GET_CODE (parmreg) == CONCAT)
4844 regno = MAX (REGNO (XEXP (parmreg, 0)), REGNO (XEXP (parmreg, 1)));
4846 regno = REGNO (parmreg);
4848 if (regno >= max_parm_reg)
4851 int old_max_parm_reg = max_parm_reg;
4853 /* It's slow to expand this one register at a time,
4854 but it's also rare and we need max_parm_reg to be
4855 precisely correct. */
4856 max_parm_reg = regno + 1;
4857 new = (rtx *) xrealloc (parm_reg_stack_loc,
4858 max_parm_reg * sizeof (rtx));
4859 memset ((char *) (new + old_max_parm_reg), 0,
4860 (max_parm_reg - old_max_parm_reg) * sizeof (rtx));
4861 parm_reg_stack_loc = new;
4864 if (GET_CODE (parmreg) == CONCAT)
4866 enum machine_mode submode = GET_MODE (XEXP (parmreg, 0));
4868 regnor = REGNO (gen_realpart (submode, parmreg));
4869 regnoi = REGNO (gen_imagpart (submode, parmreg));
4871 if (stack_parm != 0)
4873 parm_reg_stack_loc[regnor]
4874 = gen_realpart (submode, stack_parm);
4875 parm_reg_stack_loc[regnoi]
4876 = gen_imagpart (submode, stack_parm);
4880 parm_reg_stack_loc[regnor] = 0;
4881 parm_reg_stack_loc[regnoi] = 0;
4885 parm_reg_stack_loc[REGNO (parmreg)] = stack_parm;
4887 /* Mark the register as eliminable if we did no conversion
4888 and it was copied from memory at a fixed offset,
4889 and the arg pointer was not copied to a pseudo-reg.
4890 If the arg pointer is a pseudo reg or the offset formed
4891 an invalid address, such memory-equivalences
4892 as we make here would screw up life analysis for it. */
4893 if (nominal_mode == passed_mode
4896 && GET_CODE (stack_parm) == MEM
4897 && stack_offset.var == 0
4898 && reg_mentioned_p (virtual_incoming_args_rtx,
4899 XEXP (stack_parm, 0)))
4901 rtx linsn = get_last_insn ();
4904 /* Mark complex types separately. */
4905 if (GET_CODE (parmreg) == CONCAT)
4906 /* Scan backwards for the set of the real and
4908 for (sinsn = linsn; sinsn != 0;
4909 sinsn = prev_nonnote_insn (sinsn))
4911 set = single_set (sinsn);
4913 && SET_DEST (set) == regno_reg_rtx [regnoi])
4915 = gen_rtx_EXPR_LIST (REG_EQUIV,
4916 parm_reg_stack_loc[regnoi],
4919 && SET_DEST (set) == regno_reg_rtx [regnor])
4921 = gen_rtx_EXPR_LIST (REG_EQUIV,
4922 parm_reg_stack_loc[regnor],
4925 else if ((set = single_set (linsn)) != 0
4926 && SET_DEST (set) == parmreg)
4928 = gen_rtx_EXPR_LIST (REG_EQUIV,
4929 stack_parm, REG_NOTES (linsn));
4932 /* For pointer data type, suggest pointer register. */
4933 if (POINTER_TYPE_P (TREE_TYPE (parm)))
4934 mark_reg_pointer (parmreg,
4935 TYPE_ALIGN (TREE_TYPE (TREE_TYPE (parm))));
4937 /* If something wants our address, try to use ADDRESSOF. */
4938 if (TREE_ADDRESSABLE (parm))
4940 /* If we end up putting something into the stack,
4941 fixup_var_refs_insns will need to make a pass over
4942 all the instructions. It looks throughs the pending
4943 sequences -- but it can't see the ones in the
4944 CONVERSION_INSNS, if they're not on the sequence
4945 stack. So, we go back to that sequence, just so that
4946 the fixups will happen. */
4947 push_to_sequence (conversion_insns);
4948 put_var_into_stack (parm);
4949 conversion_insns = get_insns ();
4955 /* Value must be stored in the stack slot STACK_PARM
4956 during function execution. */
4958 if (promoted_mode != nominal_mode)
4960 /* Conversion is required. */
4961 rtx tempreg = gen_reg_rtx (GET_MODE (entry_parm));
4963 emit_move_insn (tempreg, validize_mem (entry_parm));
4965 push_to_sequence (conversion_insns);
4966 entry_parm = convert_to_mode (nominal_mode, tempreg,
4967 TREE_UNSIGNED (TREE_TYPE (parm)));
4969 /* ??? This may need a big-endian conversion on sparc64. */
4970 stack_parm = adjust_address (stack_parm, nominal_mode, 0);
4972 conversion_insns = get_insns ();
4977 if (entry_parm != stack_parm)
4979 if (stack_parm == 0)
4982 = assign_stack_local (GET_MODE (entry_parm),
4983 GET_MODE_SIZE (GET_MODE (entry_parm)), 0);
4984 set_mem_attributes (stack_parm, parm, 1);
4987 if (promoted_mode != nominal_mode)
4989 push_to_sequence (conversion_insns);
4990 emit_move_insn (validize_mem (stack_parm),
4991 validize_mem (entry_parm));
4992 conversion_insns = get_insns ();
4996 emit_move_insn (validize_mem (stack_parm),
4997 validize_mem (entry_parm));
4999 if (current_function_check_memory_usage)
5001 push_to_sequence (conversion_insns);
5002 emit_library_call (chkr_set_right_libfunc, LCT_CONST_MAKE_BLOCK,
5003 VOIDmode, 3, XEXP (stack_parm, 0), Pmode,
5004 GEN_INT (GET_MODE_SIZE (GET_MODE
5006 TYPE_MODE (sizetype),
5007 GEN_INT (MEMORY_USE_RW),
5008 TYPE_MODE (integer_type_node));
5010 conversion_insns = get_insns ();
5013 SET_DECL_RTL (parm, stack_parm);
5016 /* If this "parameter" was the place where we are receiving the
5017 function's incoming structure pointer, set up the result. */
5018 if (parm == function_result_decl)
5020 tree result = DECL_RESULT (fndecl);
5021 rtx addr = DECL_RTL (parm);
5024 #ifdef POINTERS_EXTEND_UNSIGNED
5025 if (GET_MODE (addr) != Pmode)
5026 addr = convert_memory_address (Pmode, addr);
5029 x = gen_rtx_MEM (DECL_MODE (result), addr);
5030 set_mem_attributes (x, result, 1);
5031 SET_DECL_RTL (result, x);
5034 if (GET_CODE (DECL_RTL (parm)) == REG)
5035 REGNO_DECL (REGNO (DECL_RTL (parm))) = parm;
5036 else if (GET_CODE (DECL_RTL (parm)) == CONCAT)
5038 REGNO_DECL (REGNO (XEXP (DECL_RTL (parm), 0))) = parm;
5039 REGNO_DECL (REGNO (XEXP (DECL_RTL (parm), 1))) = parm;
5044 /* Output all parameter conversion instructions (possibly including calls)
5045 now that all parameters have been copied out of hard registers. */
5046 emit_insns (conversion_insns);
5048 last_parm_insn = get_last_insn ();
5050 current_function_args_size = stack_args_size.constant;
5052 /* Adjust function incoming argument size for alignment and
5055 #ifdef REG_PARM_STACK_SPACE
5056 #ifndef MAYBE_REG_PARM_STACK_SPACE
5057 current_function_args_size = MAX (current_function_args_size,
5058 REG_PARM_STACK_SPACE (fndecl));
5062 #define STACK_BYTES (STACK_BOUNDARY / BITS_PER_UNIT)
5064 current_function_args_size
5065 = ((current_function_args_size + STACK_BYTES - 1)
5066 / STACK_BYTES) * STACK_BYTES;
5068 #ifdef ARGS_GROW_DOWNWARD
5069 current_function_arg_offset_rtx
5070 = (stack_args_size.var == 0 ? GEN_INT (-stack_args_size.constant)
5071 : expand_expr (size_diffop (stack_args_size.var,
5072 size_int (-stack_args_size.constant)),
5073 NULL_RTX, VOIDmode, EXPAND_MEMORY_USE_BAD));
5075 current_function_arg_offset_rtx = ARGS_SIZE_RTX (stack_args_size);
5078 /* See how many bytes, if any, of its args a function should try to pop
5081 current_function_pops_args = RETURN_POPS_ARGS (fndecl, TREE_TYPE (fndecl),
5082 current_function_args_size);
5084 /* For stdarg.h function, save info about
5085 regs and stack space used by the named args. */
5088 current_function_args_info = args_so_far;
5090 /* Set the rtx used for the function return value. Put this in its
5091 own variable so any optimizers that need this information don't have
5092 to include tree.h. Do this here so it gets done when an inlined
5093 function gets output. */
5095 current_function_return_rtx
5096 = (DECL_RTL_SET_P (DECL_RESULT (fndecl))
5097 ? DECL_RTL (DECL_RESULT (fndecl)) : NULL_RTX);
5100 /* Indicate whether REGNO is an incoming argument to the current function
5101 that was promoted to a wider mode. If so, return the RTX for the
5102 register (to get its mode). PMODE and PUNSIGNEDP are set to the mode
5103 that REGNO is promoted from and whether the promotion was signed or
5106 #ifdef PROMOTE_FUNCTION_ARGS
5109 promoted_input_arg (regno, pmode, punsignedp)
5111 enum machine_mode *pmode;
5116 for (arg = DECL_ARGUMENTS (current_function_decl); arg;
5117 arg = TREE_CHAIN (arg))
5118 if (GET_CODE (DECL_INCOMING_RTL (arg)) == REG
5119 && REGNO (DECL_INCOMING_RTL (arg)) == regno
5120 && TYPE_MODE (DECL_ARG_TYPE (arg)) == TYPE_MODE (TREE_TYPE (arg)))
5122 enum machine_mode mode = TYPE_MODE (TREE_TYPE (arg));
5123 int unsignedp = TREE_UNSIGNED (TREE_TYPE (arg));
5125 mode = promote_mode (TREE_TYPE (arg), mode, &unsignedp, 1);
5126 if (mode == GET_MODE (DECL_INCOMING_RTL (arg))
5127 && mode != DECL_MODE (arg))
5129 *pmode = DECL_MODE (arg);
5130 *punsignedp = unsignedp;
5131 return DECL_INCOMING_RTL (arg);
5140 /* Compute the size and offset from the start of the stacked arguments for a
5141 parm passed in mode PASSED_MODE and with type TYPE.
5143 INITIAL_OFFSET_PTR points to the current offset into the stacked
5146 The starting offset and size for this parm are returned in *OFFSET_PTR
5147 and *ARG_SIZE_PTR, respectively.
5149 IN_REGS is non-zero if the argument will be passed in registers. It will
5150 never be set if REG_PARM_STACK_SPACE is not defined.
5152 FNDECL is the function in which the argument was defined.
5154 There are two types of rounding that are done. The first, controlled by
5155 FUNCTION_ARG_BOUNDARY, forces the offset from the start of the argument
5156 list to be aligned to the specific boundary (in bits). This rounding
5157 affects the initial and starting offsets, but not the argument size.
5159 The second, controlled by FUNCTION_ARG_PADDING and PARM_BOUNDARY,
5160 optionally rounds the size of the parm to PARM_BOUNDARY. The
5161 initial offset is not affected by this rounding, while the size always
5162 is and the starting offset may be. */
5164 /* offset_ptr will be negative for ARGS_GROW_DOWNWARD case;
5165 initial_offset_ptr is positive because locate_and_pad_parm's
5166 callers pass in the total size of args so far as
5167 initial_offset_ptr. arg_size_ptr is always positive.*/
5170 locate_and_pad_parm (passed_mode, type, in_regs, fndecl,
5171 initial_offset_ptr, offset_ptr, arg_size_ptr,
5173 enum machine_mode passed_mode;
5175 int in_regs ATTRIBUTE_UNUSED;
5176 tree fndecl ATTRIBUTE_UNUSED;
5177 struct args_size *initial_offset_ptr;
5178 struct args_size *offset_ptr;
5179 struct args_size *arg_size_ptr;
5180 struct args_size *alignment_pad;
5184 = type ? size_in_bytes (type) : size_int (GET_MODE_SIZE (passed_mode));
5185 enum direction where_pad = FUNCTION_ARG_PADDING (passed_mode, type);
5186 int boundary = FUNCTION_ARG_BOUNDARY (passed_mode, type);
5188 #ifdef REG_PARM_STACK_SPACE
5189 /* If we have found a stack parm before we reach the end of the
5190 area reserved for registers, skip that area. */
5193 int reg_parm_stack_space = 0;
5195 #ifdef MAYBE_REG_PARM_STACK_SPACE
5196 reg_parm_stack_space = MAYBE_REG_PARM_STACK_SPACE;
5198 reg_parm_stack_space = REG_PARM_STACK_SPACE (fndecl);
5200 if (reg_parm_stack_space > 0)
5202 if (initial_offset_ptr->var)
5204 initial_offset_ptr->var
5205 = size_binop (MAX_EXPR, ARGS_SIZE_TREE (*initial_offset_ptr),
5206 ssize_int (reg_parm_stack_space));
5207 initial_offset_ptr->constant = 0;
5209 else if (initial_offset_ptr->constant < reg_parm_stack_space)
5210 initial_offset_ptr->constant = reg_parm_stack_space;
5213 #endif /* REG_PARM_STACK_SPACE */
5215 arg_size_ptr->var = 0;
5216 arg_size_ptr->constant = 0;
5217 alignment_pad->var = 0;
5218 alignment_pad->constant = 0;
5220 #ifdef ARGS_GROW_DOWNWARD
5221 if (initial_offset_ptr->var)
5223 offset_ptr->constant = 0;
5224 offset_ptr->var = size_binop (MINUS_EXPR, ssize_int (0),
5225 initial_offset_ptr->var);
5229 offset_ptr->constant = -initial_offset_ptr->constant;
5230 offset_ptr->var = 0;
5232 if (where_pad != none
5233 && (!host_integerp (sizetree, 1)
5234 || (tree_low_cst (sizetree, 1) * BITS_PER_UNIT) % PARM_BOUNDARY))
5235 sizetree = round_up (sizetree, PARM_BOUNDARY / BITS_PER_UNIT);
5236 SUB_PARM_SIZE (*offset_ptr, sizetree);
5237 if (where_pad != downward)
5238 pad_to_arg_alignment (offset_ptr, boundary, alignment_pad);
5239 if (initial_offset_ptr->var)
5240 arg_size_ptr->var = size_binop (MINUS_EXPR,
5241 size_binop (MINUS_EXPR,
5243 initial_offset_ptr->var),
5247 arg_size_ptr->constant = (-initial_offset_ptr->constant
5248 - offset_ptr->constant);
5250 #else /* !ARGS_GROW_DOWNWARD */
5252 #ifdef REG_PARM_STACK_SPACE
5253 || REG_PARM_STACK_SPACE (fndecl) > 0
5256 pad_to_arg_alignment (initial_offset_ptr, boundary, alignment_pad);
5257 *offset_ptr = *initial_offset_ptr;
5259 #ifdef PUSH_ROUNDING
5260 if (passed_mode != BLKmode)
5261 sizetree = size_int (PUSH_ROUNDING (TREE_INT_CST_LOW (sizetree)));
5264 /* Pad_below needs the pre-rounded size to know how much to pad below
5265 so this must be done before rounding up. */
5266 if (where_pad == downward
5267 /* However, BLKmode args passed in regs have their padding done elsewhere.
5268 The stack slot must be able to hold the entire register. */
5269 && !(in_regs && passed_mode == BLKmode))
5270 pad_below (offset_ptr, passed_mode, sizetree);
5272 if (where_pad != none
5273 && (!host_integerp (sizetree, 1)
5274 || (tree_low_cst (sizetree, 1) * BITS_PER_UNIT) % PARM_BOUNDARY))
5275 sizetree = round_up (sizetree, PARM_BOUNDARY / BITS_PER_UNIT);
5277 ADD_PARM_SIZE (*arg_size_ptr, sizetree);
5278 #endif /* ARGS_GROW_DOWNWARD */
5281 /* Round the stack offset in *OFFSET_PTR up to a multiple of BOUNDARY.
5282 BOUNDARY is measured in bits, but must be a multiple of a storage unit. */
5285 pad_to_arg_alignment (offset_ptr, boundary, alignment_pad)
5286 struct args_size *offset_ptr;
5288 struct args_size *alignment_pad;
5290 tree save_var = NULL_TREE;
5291 HOST_WIDE_INT save_constant = 0;
5293 int boundary_in_bytes = boundary / BITS_PER_UNIT;
5295 if (boundary > PARM_BOUNDARY && boundary > STACK_BOUNDARY)
5297 save_var = offset_ptr->var;
5298 save_constant = offset_ptr->constant;
5301 alignment_pad->var = NULL_TREE;
5302 alignment_pad->constant = 0;
5304 if (boundary > BITS_PER_UNIT)
5306 if (offset_ptr->var)
5309 #ifdef ARGS_GROW_DOWNWARD
5314 (ARGS_SIZE_TREE (*offset_ptr),
5315 boundary / BITS_PER_UNIT);
5316 offset_ptr->constant = 0; /*?*/
5317 if (boundary > PARM_BOUNDARY && boundary > STACK_BOUNDARY)
5318 alignment_pad->var = size_binop (MINUS_EXPR, offset_ptr->var,
5323 offset_ptr->constant =
5324 #ifdef ARGS_GROW_DOWNWARD
5325 FLOOR_ROUND (offset_ptr->constant, boundary_in_bytes);
5327 CEIL_ROUND (offset_ptr->constant, boundary_in_bytes);
5329 if (boundary > PARM_BOUNDARY && boundary > STACK_BOUNDARY)
5330 alignment_pad->constant = offset_ptr->constant - save_constant;
5335 #ifndef ARGS_GROW_DOWNWARD
5337 pad_below (offset_ptr, passed_mode, sizetree)
5338 struct args_size *offset_ptr;
5339 enum machine_mode passed_mode;
5342 if (passed_mode != BLKmode)
5344 if (GET_MODE_BITSIZE (passed_mode) % PARM_BOUNDARY)
5345 offset_ptr->constant
5346 += (((GET_MODE_BITSIZE (passed_mode) + PARM_BOUNDARY - 1)
5347 / PARM_BOUNDARY * PARM_BOUNDARY / BITS_PER_UNIT)
5348 - GET_MODE_SIZE (passed_mode));
5352 if (TREE_CODE (sizetree) != INTEGER_CST
5353 || (TREE_INT_CST_LOW (sizetree) * BITS_PER_UNIT) % PARM_BOUNDARY)
5355 /* Round the size up to multiple of PARM_BOUNDARY bits. */
5356 tree s2 = round_up (sizetree, PARM_BOUNDARY / BITS_PER_UNIT);
5358 ADD_PARM_SIZE (*offset_ptr, s2);
5359 SUB_PARM_SIZE (*offset_ptr, sizetree);
5365 /* Walk the tree of blocks describing the binding levels within a function
5366 and warn about uninitialized variables.
5367 This is done after calling flow_analysis and before global_alloc
5368 clobbers the pseudo-regs to hard regs. */
5371 uninitialized_vars_warning (block)
5375 for (decl = BLOCK_VARS (block); decl; decl = TREE_CHAIN (decl))
5377 if (warn_uninitialized
5378 && TREE_CODE (decl) == VAR_DECL
5379 /* These warnings are unreliable for and aggregates
5380 because assigning the fields one by one can fail to convince
5381 flow.c that the entire aggregate was initialized.
5382 Unions are troublesome because members may be shorter. */
5383 && ! AGGREGATE_TYPE_P (TREE_TYPE (decl))
5384 && DECL_RTL (decl) != 0
5385 && GET_CODE (DECL_RTL (decl)) == REG
5386 /* Global optimizations can make it difficult to determine if a
5387 particular variable has been initialized. However, a VAR_DECL
5388 with a nonzero DECL_INITIAL had an initializer, so do not
5389 claim it is potentially uninitialized.
5391 We do not care about the actual value in DECL_INITIAL, so we do
5392 not worry that it may be a dangling pointer. */
5393 && DECL_INITIAL (decl) == NULL_TREE
5394 && regno_uninitialized (REGNO (DECL_RTL (decl))))
5395 warning_with_decl (decl,
5396 "`%s' might be used uninitialized in this function");
5398 && TREE_CODE (decl) == VAR_DECL
5399 && DECL_RTL (decl) != 0
5400 && GET_CODE (DECL_RTL (decl)) == REG
5401 && regno_clobbered_at_setjmp (REGNO (DECL_RTL (decl))))
5402 warning_with_decl (decl,
5403 "variable `%s' might be clobbered by `longjmp' or `vfork'");
5405 for (sub = BLOCK_SUBBLOCKS (block); sub; sub = TREE_CHAIN (sub))
5406 uninitialized_vars_warning (sub);
5409 /* Do the appropriate part of uninitialized_vars_warning
5410 but for arguments instead of local variables. */
5413 setjmp_args_warning ()
5416 for (decl = DECL_ARGUMENTS (current_function_decl);
5417 decl; decl = TREE_CHAIN (decl))
5418 if (DECL_RTL (decl) != 0
5419 && GET_CODE (DECL_RTL (decl)) == REG
5420 && regno_clobbered_at_setjmp (REGNO (DECL_RTL (decl))))
5421 warning_with_decl (decl,
5422 "argument `%s' might be clobbered by `longjmp' or `vfork'");
5425 /* If this function call setjmp, put all vars into the stack
5426 unless they were declared `register'. */
5429 setjmp_protect (block)
5433 for (decl = BLOCK_VARS (block); decl; decl = TREE_CHAIN (decl))
5434 if ((TREE_CODE (decl) == VAR_DECL
5435 || TREE_CODE (decl) == PARM_DECL)
5436 && DECL_RTL (decl) != 0
5437 && (GET_CODE (DECL_RTL (decl)) == REG
5438 || (GET_CODE (DECL_RTL (decl)) == MEM
5439 && GET_CODE (XEXP (DECL_RTL (decl), 0)) == ADDRESSOF))
5440 /* If this variable came from an inline function, it must be
5441 that its life doesn't overlap the setjmp. If there was a
5442 setjmp in the function, it would already be in memory. We
5443 must exclude such variable because their DECL_RTL might be
5444 set to strange things such as virtual_stack_vars_rtx. */
5445 && ! DECL_FROM_INLINE (decl)
5447 #ifdef NON_SAVING_SETJMP
5448 /* If longjmp doesn't restore the registers,
5449 don't put anything in them. */
5453 ! DECL_REGISTER (decl)))
5454 put_var_into_stack (decl);
5455 for (sub = BLOCK_SUBBLOCKS (block); sub; sub = TREE_CHAIN (sub))
5456 setjmp_protect (sub);
5459 /* Like the previous function, but for args instead of local variables. */
5462 setjmp_protect_args ()
5465 for (decl = DECL_ARGUMENTS (current_function_decl);
5466 decl; decl = TREE_CHAIN (decl))
5467 if ((TREE_CODE (decl) == VAR_DECL
5468 || TREE_CODE (decl) == PARM_DECL)
5469 && DECL_RTL (decl) != 0
5470 && (GET_CODE (DECL_RTL (decl)) == REG
5471 || (GET_CODE (DECL_RTL (decl)) == MEM
5472 && GET_CODE (XEXP (DECL_RTL (decl), 0)) == ADDRESSOF))
5474 /* If longjmp doesn't restore the registers,
5475 don't put anything in them. */
5476 #ifdef NON_SAVING_SETJMP
5480 ! DECL_REGISTER (decl)))
5481 put_var_into_stack (decl);
5484 /* Return the context-pointer register corresponding to DECL,
5485 or 0 if it does not need one. */
5488 lookup_static_chain (decl)
5491 tree context = decl_function_context (decl);
5495 || (TREE_CODE (decl) == FUNCTION_DECL && DECL_NO_STATIC_CHAIN (decl)))
5498 /* We treat inline_function_decl as an alias for the current function
5499 because that is the inline function whose vars, types, etc.
5500 are being merged into the current function.
5501 See expand_inline_function. */
5502 if (context == current_function_decl || context == inline_function_decl)
5503 return virtual_stack_vars_rtx;
5505 for (link = context_display; link; link = TREE_CHAIN (link))
5506 if (TREE_PURPOSE (link) == context)
5507 return RTL_EXPR_RTL (TREE_VALUE (link));
5512 /* Convert a stack slot address ADDR for variable VAR
5513 (from a containing function)
5514 into an address valid in this function (using a static chain). */
5517 fix_lexical_addr (addr, var)
5522 HOST_WIDE_INT displacement;
5523 tree context = decl_function_context (var);
5524 struct function *fp;
5527 /* If this is the present function, we need not do anything. */
5528 if (context == current_function_decl || context == inline_function_decl)
5531 fp = find_function_data (context);
5533 if (GET_CODE (addr) == ADDRESSOF && GET_CODE (XEXP (addr, 0)) == MEM)
5534 addr = XEXP (XEXP (addr, 0), 0);
5536 /* Decode given address as base reg plus displacement. */
5537 if (GET_CODE (addr) == REG)
5538 basereg = addr, displacement = 0;
5539 else if (GET_CODE (addr) == PLUS && GET_CODE (XEXP (addr, 1)) == CONST_INT)
5540 basereg = XEXP (addr, 0), displacement = INTVAL (XEXP (addr, 1));
5544 /* We accept vars reached via the containing function's
5545 incoming arg pointer and via its stack variables pointer. */
5546 if (basereg == fp->internal_arg_pointer)
5548 /* If reached via arg pointer, get the arg pointer value
5549 out of that function's stack frame.
5551 There are two cases: If a separate ap is needed, allocate a
5552 slot in the outer function for it and dereference it that way.
5553 This is correct even if the real ap is actually a pseudo.
5554 Otherwise, just adjust the offset from the frame pointer to
5557 #ifdef NEED_SEPARATE_AP
5560 addr = get_arg_pointer_save_area (fp);
5561 addr = fix_lexical_addr (XEXP (addr, 0), var);
5562 addr = memory_address (Pmode, addr);
5564 base = gen_rtx_MEM (Pmode, addr);
5565 set_mem_alias_set (base, get_frame_alias_set ());
5566 base = copy_to_reg (base);
5568 displacement += (FIRST_PARM_OFFSET (context) - STARTING_FRAME_OFFSET);
5569 base = lookup_static_chain (var);
5573 else if (basereg == virtual_stack_vars_rtx)
5575 /* This is the same code as lookup_static_chain, duplicated here to
5576 avoid an extra call to decl_function_context. */
5579 for (link = context_display; link; link = TREE_CHAIN (link))
5580 if (TREE_PURPOSE (link) == context)
5582 base = RTL_EXPR_RTL (TREE_VALUE (link));
5590 /* Use same offset, relative to appropriate static chain or argument
5592 return plus_constant (base, displacement);
5595 /* Return the address of the trampoline for entering nested fn FUNCTION.
5596 If necessary, allocate a trampoline (in the stack frame)
5597 and emit rtl to initialize its contents (at entry to this function). */
5600 trampoline_address (function)
5606 struct function *fp;
5609 /* Find an existing trampoline and return it. */
5610 for (link = trampoline_list; link; link = TREE_CHAIN (link))
5611 if (TREE_PURPOSE (link) == function)
5613 adjust_trampoline_addr (XEXP (RTL_EXPR_RTL (TREE_VALUE (link)), 0));
5615 for (fp = outer_function_chain; fp; fp = fp->outer)
5616 for (link = fp->x_trampoline_list; link; link = TREE_CHAIN (link))
5617 if (TREE_PURPOSE (link) == function)
5619 tramp = fix_lexical_addr (XEXP (RTL_EXPR_RTL (TREE_VALUE (link)), 0),
5621 return adjust_trampoline_addr (tramp);
5624 /* None exists; we must make one. */
5626 /* Find the `struct function' for the function containing FUNCTION. */
5628 fn_context = decl_function_context (function);
5629 if (fn_context != current_function_decl
5630 && fn_context != inline_function_decl)
5631 fp = find_function_data (fn_context);
5633 /* Allocate run-time space for this trampoline
5634 (usually in the defining function's stack frame). */
5635 #ifdef ALLOCATE_TRAMPOLINE
5636 tramp = ALLOCATE_TRAMPOLINE (fp);
5638 /* If rounding needed, allocate extra space
5639 to ensure we have TRAMPOLINE_SIZE bytes left after rounding up. */
5640 #ifdef TRAMPOLINE_ALIGNMENT
5641 #define TRAMPOLINE_REAL_SIZE \
5642 (TRAMPOLINE_SIZE + (TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT) - 1)
5644 #define TRAMPOLINE_REAL_SIZE (TRAMPOLINE_SIZE)
5646 tramp = assign_stack_local_1 (BLKmode, TRAMPOLINE_REAL_SIZE, 0,
5650 /* Record the trampoline for reuse and note it for later initialization
5651 by expand_function_end. */
5654 rtlexp = make_node (RTL_EXPR);
5655 RTL_EXPR_RTL (rtlexp) = tramp;
5656 fp->x_trampoline_list = tree_cons (function, rtlexp,
5657 fp->x_trampoline_list);
5661 /* Make the RTL_EXPR node temporary, not momentary, so that the
5662 trampoline_list doesn't become garbage. */
5663 rtlexp = make_node (RTL_EXPR);
5665 RTL_EXPR_RTL (rtlexp) = tramp;
5666 trampoline_list = tree_cons (function, rtlexp, trampoline_list);
5669 tramp = fix_lexical_addr (XEXP (tramp, 0), function);
5670 return adjust_trampoline_addr (tramp);
5673 /* Given a trampoline address,
5674 round it to multiple of TRAMPOLINE_ALIGNMENT. */
5677 round_trampoline_addr (tramp)
5680 #ifdef TRAMPOLINE_ALIGNMENT
5681 /* Round address up to desired boundary. */
5682 rtx temp = gen_reg_rtx (Pmode);
5683 rtx addend = GEN_INT (TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT - 1);
5684 rtx mask = GEN_INT (-TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT);
5686 temp = expand_simple_binop (Pmode, PLUS, tramp, addend,
5687 temp, 0, OPTAB_LIB_WIDEN);
5688 tramp = expand_simple_binop (Pmode, AND, temp, mask,
5689 temp, 0, OPTAB_LIB_WIDEN);
5694 /* Given a trampoline address, round it then apply any
5695 platform-specific adjustments so that the result can be used for a
5699 adjust_trampoline_addr (tramp)
5702 tramp = round_trampoline_addr (tramp);
5703 #ifdef TRAMPOLINE_ADJUST_ADDRESS
5704 TRAMPOLINE_ADJUST_ADDRESS (tramp);
5709 /* Put all this function's BLOCK nodes including those that are chained
5710 onto the first block into a vector, and return it.
5711 Also store in each NOTE for the beginning or end of a block
5712 the index of that block in the vector.
5713 The arguments are BLOCK, the chain of top-level blocks of the function,
5714 and INSNS, the insn chain of the function. */
5720 tree *block_vector, *last_block_vector;
5722 tree block = DECL_INITIAL (current_function_decl);
5727 /* Fill the BLOCK_VECTOR with all of the BLOCKs in this function, in
5728 depth-first order. */
5729 block_vector = get_block_vector (block, &n_blocks);
5730 block_stack = (tree *) xmalloc (n_blocks * sizeof (tree));
5732 last_block_vector = identify_blocks_1 (get_insns (),
5734 block_vector + n_blocks,
5737 /* If we didn't use all of the subblocks, we've misplaced block notes. */
5738 /* ??? This appears to happen all the time. Latent bugs elsewhere? */
5739 if (0 && last_block_vector != block_vector + n_blocks)
5742 free (block_vector);
5746 /* Subroutine of identify_blocks. Do the block substitution on the
5747 insn chain beginning with INSNS. Recurse for CALL_PLACEHOLDER chains.
5749 BLOCK_STACK is pushed and popped for each BLOCK_BEGIN/BLOCK_END pair.
5750 BLOCK_VECTOR is incremented for each block seen. */
5753 identify_blocks_1 (insns, block_vector, end_block_vector, orig_block_stack)
5756 tree *end_block_vector;
5757 tree *orig_block_stack;
5760 tree *block_stack = orig_block_stack;
5762 for (insn = insns; insn; insn = NEXT_INSN (insn))
5764 if (GET_CODE (insn) == NOTE)
5766 if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_BLOCK_BEG)
5770 /* If there are more block notes than BLOCKs, something
5772 if (block_vector == end_block_vector)
5775 b = *block_vector++;
5776 NOTE_BLOCK (insn) = b;
5779 else if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_BLOCK_END)
5781 /* If there are more NOTE_INSN_BLOCK_ENDs than
5782 NOTE_INSN_BLOCK_BEGs, something is badly wrong. */
5783 if (block_stack == orig_block_stack)
5786 NOTE_BLOCK (insn) = *--block_stack;
5789 else if (GET_CODE (insn) == CALL_INSN
5790 && GET_CODE (PATTERN (insn)) == CALL_PLACEHOLDER)
5792 rtx cp = PATTERN (insn);
5794 block_vector = identify_blocks_1 (XEXP (cp, 0), block_vector,
5795 end_block_vector, block_stack);
5797 block_vector = identify_blocks_1 (XEXP (cp, 1), block_vector,
5798 end_block_vector, block_stack);
5800 block_vector = identify_blocks_1 (XEXP (cp, 2), block_vector,
5801 end_block_vector, block_stack);
5805 /* If there are more NOTE_INSN_BLOCK_BEGINs than NOTE_INSN_BLOCK_ENDs,
5806 something is badly wrong. */
5807 if (block_stack != orig_block_stack)
5810 return block_vector;
5813 /* Identify BLOCKs referenced by more than one NOTE_INSN_BLOCK_{BEG,END},
5814 and create duplicate blocks. */
5815 /* ??? Need an option to either create block fragments or to create
5816 abstract origin duplicates of a source block. It really depends
5817 on what optimization has been performed. */
5822 tree block = DECL_INITIAL (current_function_decl);
5823 varray_type block_stack;
5825 if (block == NULL_TREE)
5828 VARRAY_TREE_INIT (block_stack, 10, "block_stack");
5830 /* Reset the TREE_ASM_WRITTEN bit for all blocks. */
5831 reorder_blocks_0 (block);
5833 /* Prune the old trees away, so that they don't get in the way. */
5834 BLOCK_SUBBLOCKS (block) = NULL_TREE;
5835 BLOCK_CHAIN (block) = NULL_TREE;
5837 /* Recreate the block tree from the note nesting. */
5838 reorder_blocks_1 (get_insns (), block, &block_stack);
5839 BLOCK_SUBBLOCKS (block) = blocks_nreverse (BLOCK_SUBBLOCKS (block));
5841 /* Remove deleted blocks from the block fragment chains. */
5842 reorder_fix_fragments (block);
5844 VARRAY_FREE (block_stack);
5847 /* Helper function for reorder_blocks. Reset TREE_ASM_WRITTEN. */
5850 reorder_blocks_0 (block)
5855 TREE_ASM_WRITTEN (block) = 0;
5856 reorder_blocks_0 (BLOCK_SUBBLOCKS (block));
5857 block = BLOCK_CHAIN (block);
5862 reorder_blocks_1 (insns, current_block, p_block_stack)
5865 varray_type *p_block_stack;
5869 for (insn = insns; insn; insn = NEXT_INSN (insn))
5871 if (GET_CODE (insn) == NOTE)
5873 if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_BLOCK_BEG)
5875 tree block = NOTE_BLOCK (insn);
5877 /* If we have seen this block before, that means it now
5878 spans multiple address regions. Create a new fragment. */
5879 if (TREE_ASM_WRITTEN (block))
5881 tree new_block = copy_node (block);
5884 origin = (BLOCK_FRAGMENT_ORIGIN (block)
5885 ? BLOCK_FRAGMENT_ORIGIN (block)
5887 BLOCK_FRAGMENT_ORIGIN (new_block) = origin;
5888 BLOCK_FRAGMENT_CHAIN (new_block)
5889 = BLOCK_FRAGMENT_CHAIN (origin);
5890 BLOCK_FRAGMENT_CHAIN (origin) = new_block;
5892 NOTE_BLOCK (insn) = new_block;
5896 BLOCK_SUBBLOCKS (block) = 0;
5897 TREE_ASM_WRITTEN (block) = 1;
5898 BLOCK_SUPERCONTEXT (block) = current_block;
5899 BLOCK_CHAIN (block) = BLOCK_SUBBLOCKS (current_block);
5900 BLOCK_SUBBLOCKS (current_block) = block;
5901 current_block = block;
5902 VARRAY_PUSH_TREE (*p_block_stack, block);
5904 else if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_BLOCK_END)
5906 NOTE_BLOCK (insn) = VARRAY_TOP_TREE (*p_block_stack);
5907 VARRAY_POP (*p_block_stack);
5908 BLOCK_SUBBLOCKS (current_block)
5909 = blocks_nreverse (BLOCK_SUBBLOCKS (current_block));
5910 current_block = BLOCK_SUPERCONTEXT (current_block);
5913 else if (GET_CODE (insn) == CALL_INSN
5914 && GET_CODE (PATTERN (insn)) == CALL_PLACEHOLDER)
5916 rtx cp = PATTERN (insn);
5917 reorder_blocks_1 (XEXP (cp, 0), current_block, p_block_stack);
5919 reorder_blocks_1 (XEXP (cp, 1), current_block, p_block_stack);
5921 reorder_blocks_1 (XEXP (cp, 2), current_block, p_block_stack);
5926 /* Rationalize BLOCK_FRAGMENT_ORIGIN. If an origin block no longer
5927 appears in the block tree, select one of the fragments to become
5928 the new origin block. */
5931 reorder_fix_fragments (block)
5936 tree dup_origin = BLOCK_FRAGMENT_ORIGIN (block);
5937 tree new_origin = NULL_TREE;
5941 if (! TREE_ASM_WRITTEN (dup_origin))
5943 new_origin = BLOCK_FRAGMENT_CHAIN (dup_origin);
5945 /* Find the first of the remaining fragments. There must
5946 be at least one -- the current block. */
5947 while (! TREE_ASM_WRITTEN (new_origin))
5948 new_origin = BLOCK_FRAGMENT_CHAIN (new_origin);
5949 BLOCK_FRAGMENT_ORIGIN (new_origin) = NULL_TREE;
5952 else if (! dup_origin)
5955 /* Re-root the rest of the fragments to the new origin. In the
5956 case that DUP_ORIGIN was null, that means BLOCK was the origin
5957 of a chain of fragments and we want to remove those fragments
5958 that didn't make it to the output. */
5961 tree *pp = &BLOCK_FRAGMENT_CHAIN (new_origin);
5966 if (TREE_ASM_WRITTEN (chain))
5968 BLOCK_FRAGMENT_ORIGIN (chain) = new_origin;
5970 pp = &BLOCK_FRAGMENT_CHAIN (chain);
5972 chain = BLOCK_FRAGMENT_CHAIN (chain);
5977 reorder_fix_fragments (BLOCK_SUBBLOCKS (block));
5978 block = BLOCK_CHAIN (block);
5982 /* Reverse the order of elements in the chain T of blocks,
5983 and return the new head of the chain (old last element). */
5989 tree prev = 0, decl, next;
5990 for (decl = t; decl; decl = next)
5992 next = BLOCK_CHAIN (decl);
5993 BLOCK_CHAIN (decl) = prev;
5999 /* Count the subblocks of the list starting with BLOCK. If VECTOR is
6000 non-NULL, list them all into VECTOR, in a depth-first preorder
6001 traversal of the block tree. Also clear TREE_ASM_WRITTEN in all
6005 all_blocks (block, vector)
6013 TREE_ASM_WRITTEN (block) = 0;
6015 /* Record this block. */
6017 vector[n_blocks] = block;
6021 /* Record the subblocks, and their subblocks... */
6022 n_blocks += all_blocks (BLOCK_SUBBLOCKS (block),
6023 vector ? vector + n_blocks : 0);
6024 block = BLOCK_CHAIN (block);
6030 /* Return a vector containing all the blocks rooted at BLOCK. The
6031 number of elements in the vector is stored in N_BLOCKS_P. The
6032 vector is dynamically allocated; it is the caller's responsibility
6033 to call `free' on the pointer returned. */
6036 get_block_vector (block, n_blocks_p)
6042 *n_blocks_p = all_blocks (block, NULL);
6043 block_vector = (tree *) xmalloc (*n_blocks_p * sizeof (tree));
6044 all_blocks (block, block_vector);
6046 return block_vector;
6049 static int next_block_index = 2;
6051 /* Set BLOCK_NUMBER for all the blocks in FN. */
6061 /* For SDB and XCOFF debugging output, we start numbering the blocks
6062 from 1 within each function, rather than keeping a running
6064 #if defined (SDB_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
6065 if (write_symbols == SDB_DEBUG || write_symbols == XCOFF_DEBUG)
6066 next_block_index = 1;
6069 block_vector = get_block_vector (DECL_INITIAL (fn), &n_blocks);
6071 /* The top-level BLOCK isn't numbered at all. */
6072 for (i = 1; i < n_blocks; ++i)
6073 /* We number the blocks from two. */
6074 BLOCK_NUMBER (block_vector[i]) = next_block_index++;
6076 free (block_vector);
6081 /* Allocate a function structure and reset its contents to the defaults. */
6084 prepare_function_start ()
6086 cfun = (struct function *) ggc_alloc_cleared (sizeof (struct function));
6088 init_stmt_for_function ();
6089 init_eh_for_function ();
6091 cse_not_expected = ! optimize;
6093 /* Caller save not needed yet. */
6094 caller_save_needed = 0;
6096 /* No stack slots have been made yet. */
6097 stack_slot_list = 0;
6099 current_function_has_nonlocal_label = 0;
6100 current_function_has_nonlocal_goto = 0;
6102 /* There is no stack slot for handling nonlocal gotos. */
6103 nonlocal_goto_handler_slots = 0;
6104 nonlocal_goto_stack_level = 0;
6106 /* No labels have been declared for nonlocal use. */
6107 nonlocal_labels = 0;
6108 nonlocal_goto_handler_labels = 0;
6110 /* No function calls so far in this function. */
6111 function_call_count = 0;
6113 /* No parm regs have been allocated.
6114 (This is important for output_inline_function.) */
6115 max_parm_reg = LAST_VIRTUAL_REGISTER + 1;
6117 /* Initialize the RTL mechanism. */
6120 /* Initialize the queue of pending postincrement and postdecrements,
6121 and some other info in expr.c. */
6124 /* We haven't done register allocation yet. */
6127 init_varasm_status (cfun);
6129 /* Clear out data used for inlining. */
6130 cfun->inlinable = 0;
6131 cfun->original_decl_initial = 0;
6132 cfun->original_arg_vector = 0;
6134 cfun->stack_alignment_needed = STACK_BOUNDARY;
6135 cfun->preferred_stack_boundary = STACK_BOUNDARY;
6137 /* Set if a call to setjmp is seen. */
6138 current_function_calls_setjmp = 0;
6140 /* Set if a call to longjmp is seen. */
6141 current_function_calls_longjmp = 0;
6143 current_function_calls_alloca = 0;
6144 current_function_contains_functions = 0;
6145 current_function_is_leaf = 0;
6146 current_function_nothrow = 0;
6147 current_function_sp_is_unchanging = 0;
6148 current_function_uses_only_leaf_regs = 0;
6149 current_function_has_computed_jump = 0;
6150 current_function_is_thunk = 0;
6152 current_function_returns_pcc_struct = 0;
6153 current_function_returns_struct = 0;
6154 current_function_epilogue_delay_list = 0;
6155 current_function_uses_const_pool = 0;
6156 current_function_uses_pic_offset_table = 0;
6157 current_function_cannot_inline = 0;
6159 /* We have not yet needed to make a label to jump to for tail-recursion. */
6160 tail_recursion_label = 0;
6162 /* We haven't had a need to make a save area for ap yet. */
6163 arg_pointer_save_area = 0;
6165 /* No stack slots allocated yet. */
6168 /* No SAVE_EXPRs in this function yet. */
6171 /* No RTL_EXPRs in this function yet. */
6174 /* Set up to allocate temporaries. */
6177 /* Indicate that we need to distinguish between the return value of the
6178 present function and the return value of a function being called. */
6179 rtx_equal_function_value_matters = 1;
6181 /* Indicate that we have not instantiated virtual registers yet. */
6182 virtuals_instantiated = 0;
6184 /* Indicate that we want CONCATs now. */
6185 generating_concat_p = 1;
6187 /* Indicate we have no need of a frame pointer yet. */
6188 frame_pointer_needed = 0;
6190 /* By default assume not varargs or stdarg. */
6191 current_function_varargs = 0;
6192 current_function_stdarg = 0;
6194 /* We haven't made any trampolines for this function yet. */
6195 trampoline_list = 0;
6197 init_pending_stack_adjust ();
6198 inhibit_defer_pop = 0;
6200 current_function_outgoing_args_size = 0;
6202 if (init_lang_status)
6203 (*init_lang_status) (cfun);
6204 if (init_machine_status)
6205 (*init_machine_status) (cfun);
6208 /* Initialize the rtl expansion mechanism so that we can do simple things
6209 like generate sequences. This is used to provide a context during global
6210 initialization of some passes. */
6212 init_dummy_function_start ()
6214 prepare_function_start ();
6217 /* Generate RTL for the start of the function SUBR (a FUNCTION_DECL tree node)
6218 and initialize static variables for generating RTL for the statements
6222 init_function_start (subr, filename, line)
6224 const char *filename;
6227 prepare_function_start ();
6229 current_function_name = (*decl_printable_name) (subr, 2);
6232 /* Nonzero if this is a nested function that uses a static chain. */
6234 current_function_needs_context
6235 = (decl_function_context (current_function_decl) != 0
6236 && ! DECL_NO_STATIC_CHAIN (current_function_decl));
6238 /* Within function body, compute a type's size as soon it is laid out. */
6239 immediate_size_expand++;
6241 /* Prevent ever trying to delete the first instruction of a function.
6242 Also tell final how to output a linenum before the function prologue.
6243 Note linenums could be missing, e.g. when compiling a Java .class file. */
6245 emit_line_note (filename, line);
6247 /* Make sure first insn is a note even if we don't want linenums.
6248 This makes sure the first insn will never be deleted.
6249 Also, final expects a note to appear there. */
6250 emit_note (NULL, NOTE_INSN_DELETED);
6252 /* Set flags used by final.c. */
6253 if (aggregate_value_p (DECL_RESULT (subr)))
6255 #ifdef PCC_STATIC_STRUCT_RETURN
6256 current_function_returns_pcc_struct = 1;
6258 current_function_returns_struct = 1;
6261 /* Warn if this value is an aggregate type,
6262 regardless of which calling convention we are using for it. */
6263 if (warn_aggregate_return
6264 && AGGREGATE_TYPE_P (TREE_TYPE (DECL_RESULT (subr))))
6265 warning ("function returns an aggregate");
6267 current_function_returns_pointer
6268 = POINTER_TYPE_P (TREE_TYPE (DECL_RESULT (subr)));
6271 /* Make sure all values used by the optimization passes have sane
6274 init_function_for_compilation ()
6278 /* No prologue/epilogue insns yet. */
6279 VARRAY_GROW (prologue, 0);
6280 VARRAY_GROW (epilogue, 0);
6281 VARRAY_GROW (sibcall_epilogue, 0);
6284 /* Indicate that the current function uses extra args
6285 not explicitly mentioned in the argument list in any fashion. */
6290 current_function_varargs = 1;
6293 /* Expand a call to __main at the beginning of a possible main function. */
6295 #if defined(INIT_SECTION_ASM_OP) && !defined(INVOKE__main)
6296 #undef HAS_INIT_SECTION
6297 #define HAS_INIT_SECTION
6301 expand_main_function ()
6303 #ifdef FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN
6304 if (FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN)
6306 int align = PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT;
6309 /* Forcibly align the stack. */
6310 #ifdef STACK_GROWS_DOWNWARD
6311 tmp = expand_simple_binop (Pmode, AND, stack_pointer_rtx, GEN_INT(-align),
6312 stack_pointer_rtx, 1, OPTAB_WIDEN);
6314 tmp = expand_simple_binop (Pmode, PLUS, stack_pointer_rtx,
6315 GEN_INT (align - 1), NULL_RTX, 1, OPTAB_WIDEN);
6316 tmp = expand_simple_binop (Pmode, AND, tmp, GEN_INT (-align),
6317 stack_pointer_rtx, 1, OPTAB_WIDEN);
6319 if (tmp != stack_pointer_rtx)
6320 emit_move_insn (stack_pointer_rtx, tmp);
6322 /* Enlist allocate_dynamic_stack_space to pick up the pieces. */
6323 tmp = force_reg (Pmode, const0_rtx);
6324 allocate_dynamic_stack_space (tmp, NULL_RTX, BIGGEST_ALIGNMENT);
6328 #ifndef HAS_INIT_SECTION
6329 emit_library_call (gen_rtx_SYMBOL_REF (Pmode, NAME__MAIN), 0,
6334 extern struct obstack permanent_obstack;
6336 /* The PENDING_SIZES represent the sizes of variable-sized types.
6337 Create RTL for the various sizes now (using temporary variables),
6338 so that we can refer to the sizes from the RTL we are generating
6339 for the current function. The PENDING_SIZES are a TREE_LIST. The
6340 TREE_VALUE of each node is a SAVE_EXPR. */
6343 expand_pending_sizes (pending_sizes)
6348 /* Evaluate now the sizes of any types declared among the arguments. */
6349 for (tem = pending_sizes; tem; tem = TREE_CHAIN (tem))
6351 expand_expr (TREE_VALUE (tem), const0_rtx, VOIDmode,
6352 EXPAND_MEMORY_USE_BAD);
6353 /* Flush the queue in case this parameter declaration has
6359 /* Start the RTL for a new function, and set variables used for
6361 SUBR is the FUNCTION_DECL node.
6362 PARMS_HAVE_CLEANUPS is nonzero if there are cleanups associated with
6363 the function's parameters, which must be run at any return statement. */
6366 expand_function_start (subr, parms_have_cleanups)
6368 int parms_have_cleanups;
6371 rtx last_ptr = NULL_RTX;
6373 /* Make sure volatile mem refs aren't considered
6374 valid operands of arithmetic insns. */
6375 init_recog_no_volatile ();
6377 /* Set this before generating any memory accesses. */
6378 current_function_check_memory_usage
6379 = (flag_check_memory_usage
6380 && ! DECL_NO_CHECK_MEMORY_USAGE (current_function_decl));
6382 current_function_instrument_entry_exit
6383 = (flag_instrument_function_entry_exit
6384 && ! DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (subr));
6386 current_function_limit_stack
6387 = (stack_limit_rtx != NULL_RTX && ! DECL_NO_LIMIT_STACK (subr));
6389 /* If function gets a static chain arg, store it in the stack frame.
6390 Do this first, so it gets the first stack slot offset. */
6391 if (current_function_needs_context)
6393 last_ptr = assign_stack_local (Pmode, GET_MODE_SIZE (Pmode), 0);
6395 /* Delay copying static chain if it is not a register to avoid
6396 conflicts with regs used for parameters. */
6397 if (! SMALL_REGISTER_CLASSES
6398 || GET_CODE (static_chain_incoming_rtx) == REG)
6399 emit_move_insn (last_ptr, static_chain_incoming_rtx);
6402 /* If the parameters of this function need cleaning up, get a label
6403 for the beginning of the code which executes those cleanups. This must
6404 be done before doing anything with return_label. */
6405 if (parms_have_cleanups)
6406 cleanup_label = gen_label_rtx ();
6410 /* Make the label for return statements to jump to. Do not special
6411 case machines with special return instructions -- they will be
6412 handled later during jump, ifcvt, or epilogue creation. */
6413 return_label = gen_label_rtx ();
6415 /* Initialize rtx used to return the value. */
6416 /* Do this before assign_parms so that we copy the struct value address
6417 before any library calls that assign parms might generate. */
6419 /* Decide whether to return the value in memory or in a register. */
6420 if (aggregate_value_p (DECL_RESULT (subr)))
6422 /* Returning something that won't go in a register. */
6423 rtx value_address = 0;
6425 #ifdef PCC_STATIC_STRUCT_RETURN
6426 if (current_function_returns_pcc_struct)
6428 int size = int_size_in_bytes (TREE_TYPE (DECL_RESULT (subr)));
6429 value_address = assemble_static_space (size);
6434 /* Expect to be passed the address of a place to store the value.
6435 If it is passed as an argument, assign_parms will take care of
6437 if (struct_value_incoming_rtx)
6439 value_address = gen_reg_rtx (Pmode);
6440 emit_move_insn (value_address, struct_value_incoming_rtx);
6445 rtx x = gen_rtx_MEM (DECL_MODE (DECL_RESULT (subr)), value_address);
6446 set_mem_attributes (x, DECL_RESULT (subr), 1);
6447 SET_DECL_RTL (DECL_RESULT (subr), x);
6450 else if (DECL_MODE (DECL_RESULT (subr)) == VOIDmode)
6451 /* If return mode is void, this decl rtl should not be used. */
6452 SET_DECL_RTL (DECL_RESULT (subr), NULL_RTX);
6455 /* Compute the return values into a pseudo reg, which we will copy
6456 into the true return register after the cleanups are done. */
6458 /* In order to figure out what mode to use for the pseudo, we
6459 figure out what the mode of the eventual return register will
6460 actually be, and use that. */
6462 = hard_function_value (TREE_TYPE (DECL_RESULT (subr)),
6465 /* Structures that are returned in registers are not aggregate_value_p,
6466 so we may see a PARALLEL. Don't play pseudo games with this. */
6467 if (! REG_P (hard_reg))
6468 SET_DECL_RTL (DECL_RESULT (subr), hard_reg);
6471 /* Create the pseudo. */
6472 SET_DECL_RTL (DECL_RESULT (subr), gen_reg_rtx (GET_MODE (hard_reg)));
6474 /* Needed because we may need to move this to memory
6475 in case it's a named return value whose address is taken. */
6476 DECL_REGISTER (DECL_RESULT (subr)) = 1;
6480 /* Initialize rtx for parameters and local variables.
6481 In some cases this requires emitting insns. */
6483 assign_parms (subr);
6485 /* Copy the static chain now if it wasn't a register. The delay is to
6486 avoid conflicts with the parameter passing registers. */
6488 if (SMALL_REGISTER_CLASSES && current_function_needs_context)
6489 if (GET_CODE (static_chain_incoming_rtx) != REG)
6490 emit_move_insn (last_ptr, static_chain_incoming_rtx);
6492 /* The following was moved from init_function_start.
6493 The move is supposed to make sdb output more accurate. */
6494 /* Indicate the beginning of the function body,
6495 as opposed to parm setup. */
6496 emit_note (NULL, NOTE_INSN_FUNCTION_BEG);
6498 if (GET_CODE (get_last_insn ()) != NOTE)
6499 emit_note (NULL, NOTE_INSN_DELETED);
6500 parm_birth_insn = get_last_insn ();
6502 context_display = 0;
6503 if (current_function_needs_context)
6505 /* Fetch static chain values for containing functions. */
6506 tem = decl_function_context (current_function_decl);
6507 /* Copy the static chain pointer into a pseudo. If we have
6508 small register classes, copy the value from memory if
6509 static_chain_incoming_rtx is a REG. */
6512 /* If the static chain originally came in a register, put it back
6513 there, then move it out in the next insn. The reason for
6514 this peculiar code is to satisfy function integration. */
6515 if (SMALL_REGISTER_CLASSES
6516 && GET_CODE (static_chain_incoming_rtx) == REG)
6517 emit_move_insn (static_chain_incoming_rtx, last_ptr);
6518 last_ptr = copy_to_reg (static_chain_incoming_rtx);
6523 tree rtlexp = make_node (RTL_EXPR);
6525 RTL_EXPR_RTL (rtlexp) = last_ptr;
6526 context_display = tree_cons (tem, rtlexp, context_display);
6527 tem = decl_function_context (tem);
6530 /* Chain thru stack frames, assuming pointer to next lexical frame
6531 is found at the place we always store it. */
6532 #ifdef FRAME_GROWS_DOWNWARD
6533 last_ptr = plus_constant (last_ptr,
6534 -(HOST_WIDE_INT) GET_MODE_SIZE (Pmode));
6536 last_ptr = gen_rtx_MEM (Pmode, memory_address (Pmode, last_ptr));
6537 set_mem_alias_set (last_ptr, get_frame_alias_set ());
6538 last_ptr = copy_to_reg (last_ptr);
6540 /* If we are not optimizing, ensure that we know that this
6541 piece of context is live over the entire function. */
6543 save_expr_regs = gen_rtx_EXPR_LIST (VOIDmode, last_ptr,
6548 if (current_function_instrument_entry_exit)
6550 rtx fun = DECL_RTL (current_function_decl);
6551 if (GET_CODE (fun) == MEM)
6552 fun = XEXP (fun, 0);
6555 emit_library_call (profile_function_entry_libfunc, 0, VOIDmode, 2,
6557 expand_builtin_return_addr (BUILT_IN_RETURN_ADDRESS,
6559 hard_frame_pointer_rtx),
6565 PROFILE_HOOK (profile_label_no);
6568 /* After the display initializations is where the tail-recursion label
6569 should go, if we end up needing one. Ensure we have a NOTE here
6570 since some things (like trampolines) get placed before this. */
6571 tail_recursion_reentry = emit_note (NULL, NOTE_INSN_DELETED);
6573 /* Evaluate now the sizes of any types declared among the arguments. */
6574 expand_pending_sizes (nreverse (get_pending_sizes ()));
6576 /* Make sure there is a line number after the function entry setup code. */
6577 force_next_line_note ();
6580 /* Undo the effects of init_dummy_function_start. */
6582 expand_dummy_function_end ()
6584 /* End any sequences that failed to be closed due to syntax errors. */
6585 while (in_sequence_p ())
6588 /* Outside function body, can't compute type's actual size
6589 until next function's body starts. */
6591 free_after_parsing (cfun);
6592 free_after_compilation (cfun);
6596 /* Call DOIT for each hard register used as a return value from
6597 the current function. */
6600 diddle_return_value (doit, arg)
6601 void (*doit) PARAMS ((rtx, void *));
6604 rtx outgoing = current_function_return_rtx;
6609 if (GET_CODE (outgoing) == REG)
6610 (*doit) (outgoing, arg);
6611 else if (GET_CODE (outgoing) == PARALLEL)
6615 for (i = 0; i < XVECLEN (outgoing, 0); i++)
6617 rtx x = XEXP (XVECEXP (outgoing, 0, i), 0);
6619 if (GET_CODE (x) == REG && REGNO (x) < FIRST_PSEUDO_REGISTER)
6626 do_clobber_return_reg (reg, arg)
6628 void *arg ATTRIBUTE_UNUSED;
6630 emit_insn (gen_rtx_CLOBBER (VOIDmode, reg));
6634 clobber_return_register ()
6636 diddle_return_value (do_clobber_return_reg, NULL);
6638 /* In case we do use pseudo to return value, clobber it too. */
6639 if (DECL_RTL_SET_P (DECL_RESULT (current_function_decl)))
6641 tree decl_result = DECL_RESULT (current_function_decl);
6642 rtx decl_rtl = DECL_RTL (decl_result);
6643 if (REG_P (decl_rtl) && REGNO (decl_rtl) >= FIRST_PSEUDO_REGISTER)
6645 do_clobber_return_reg (decl_rtl, NULL);
6651 do_use_return_reg (reg, arg)
6653 void *arg ATTRIBUTE_UNUSED;
6655 emit_insn (gen_rtx_USE (VOIDmode, reg));
6659 use_return_register ()
6661 diddle_return_value (do_use_return_reg, NULL);
6664 /* Generate RTL for the end of the current function.
6665 FILENAME and LINE are the current position in the source file.
6667 It is up to language-specific callers to do cleanups for parameters--
6668 or else, supply 1 for END_BINDINGS and we will call expand_end_bindings. */
6671 expand_function_end (filename, line, end_bindings)
6672 const char *filename;
6679 #ifdef TRAMPOLINE_TEMPLATE
6680 static rtx initial_trampoline;
6683 finish_expr_for_function ();
6685 /* If arg_pointer_save_area was referenced only from a nested
6686 function, we will not have initialized it yet. Do that now. */
6687 if (arg_pointer_save_area && ! cfun->arg_pointer_save_area_init)
6688 get_arg_pointer_save_area (cfun);
6690 #ifdef NON_SAVING_SETJMP
6691 /* Don't put any variables in registers if we call setjmp
6692 on a machine that fails to restore the registers. */
6693 if (NON_SAVING_SETJMP && current_function_calls_setjmp)
6695 if (DECL_INITIAL (current_function_decl) != error_mark_node)
6696 setjmp_protect (DECL_INITIAL (current_function_decl));
6698 setjmp_protect_args ();
6702 /* Initialize any trampolines required by this function. */
6703 for (link = trampoline_list; link; link = TREE_CHAIN (link))
6705 tree function = TREE_PURPOSE (link);
6706 rtx context ATTRIBUTE_UNUSED = lookup_static_chain (function);
6707 rtx tramp = RTL_EXPR_RTL (TREE_VALUE (link));
6708 #ifdef TRAMPOLINE_TEMPLATE
6713 #ifdef TRAMPOLINE_TEMPLATE
6714 /* First make sure this compilation has a template for
6715 initializing trampolines. */
6716 if (initial_trampoline == 0)
6719 = gen_rtx_MEM (BLKmode, assemble_trampoline_template ());
6720 set_mem_align (initial_trampoline, TRAMPOLINE_ALIGNMENT);
6722 ggc_add_rtx_root (&initial_trampoline, 1);
6726 /* Generate insns to initialize the trampoline. */
6728 tramp = round_trampoline_addr (XEXP (tramp, 0));
6729 #ifdef TRAMPOLINE_TEMPLATE
6730 blktramp = replace_equiv_address (initial_trampoline, tramp);
6731 emit_block_move (blktramp, initial_trampoline,
6732 GEN_INT (TRAMPOLINE_SIZE));
6734 INITIALIZE_TRAMPOLINE (tramp, XEXP (DECL_RTL (function), 0), context);
6738 /* Put those insns at entry to the containing function (this one). */
6739 emit_insns_before (seq, tail_recursion_reentry);
6742 /* If we are doing stack checking and this function makes calls,
6743 do a stack probe at the start of the function to ensure we have enough
6744 space for another stack frame. */
6745 if (flag_stack_check && ! STACK_CHECK_BUILTIN)
6749 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
6750 if (GET_CODE (insn) == CALL_INSN)
6753 probe_stack_range (STACK_CHECK_PROTECT,
6754 GEN_INT (STACK_CHECK_MAX_FRAME_SIZE));
6757 emit_insns_before (seq, tail_recursion_reentry);
6762 /* Warn about unused parms if extra warnings were specified. */
6763 /* Either ``-W -Wunused'' or ``-Wunused-parameter'' enables this
6764 warning. WARN_UNUSED_PARAMETER is negative when set by
6766 if (warn_unused_parameter > 0
6767 || (warn_unused_parameter < 0 && extra_warnings))
6771 for (decl = DECL_ARGUMENTS (current_function_decl);
6772 decl; decl = TREE_CHAIN (decl))
6773 if (! TREE_USED (decl) && TREE_CODE (decl) == PARM_DECL
6774 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl))
6775 warning_with_decl (decl, "unused parameter `%s'");
6778 /* Delete handlers for nonlocal gotos if nothing uses them. */
6779 if (nonlocal_goto_handler_slots != 0
6780 && ! current_function_has_nonlocal_label)
6783 /* End any sequences that failed to be closed due to syntax errors. */
6784 while (in_sequence_p ())
6787 /* Outside function body, can't compute type's actual size
6788 until next function's body starts. */
6789 immediate_size_expand--;
6791 clear_pending_stack_adjust ();
6792 do_pending_stack_adjust ();
6794 /* Mark the end of the function body.
6795 If control reaches this insn, the function can drop through
6796 without returning a value. */
6797 emit_note (NULL, NOTE_INSN_FUNCTION_END);
6799 /* Must mark the last line number note in the function, so that the test
6800 coverage code can avoid counting the last line twice. This just tells
6801 the code to ignore the immediately following line note, since there
6802 already exists a copy of this note somewhere above. This line number
6803 note is still needed for debugging though, so we can't delete it. */
6804 if (flag_test_coverage)
6805 emit_note (NULL, NOTE_INSN_REPEATED_LINE_NUMBER);
6807 /* Output a linenumber for the end of the function.
6808 SDB depends on this. */
6809 emit_line_note_force (filename, line);
6811 /* Before the return label (if any), clobber the return
6812 registers so that they are not propogated live to the rest of
6813 the function. This can only happen with functions that drop
6814 through; if there had been a return statement, there would
6815 have either been a return rtx, or a jump to the return label.
6817 We delay actual code generation after the current_function_value_rtx
6819 clobber_after = get_last_insn ();
6821 /* Output the label for the actual return from the function,
6822 if one is expected. This happens either because a function epilogue
6823 is used instead of a return instruction, or because a return was done
6824 with a goto in order to run local cleanups, or because of pcc-style
6825 structure returning. */
6827 emit_label (return_label);
6829 /* C++ uses this. */
6831 expand_end_bindings (0, 0, 0);
6833 if (current_function_instrument_entry_exit)
6835 rtx fun = DECL_RTL (current_function_decl);
6836 if (GET_CODE (fun) == MEM)
6837 fun = XEXP (fun, 0);
6840 emit_library_call (profile_function_exit_libfunc, 0, VOIDmode, 2,
6842 expand_builtin_return_addr (BUILT_IN_RETURN_ADDRESS,
6844 hard_frame_pointer_rtx),
6848 /* Let except.c know where it should emit the call to unregister
6849 the function context for sjlj exceptions. */
6850 if (flag_exceptions && USING_SJLJ_EXCEPTIONS)
6851 sjlj_emit_function_exit_after (get_last_insn ());
6853 /* If we had calls to alloca, and this machine needs
6854 an accurate stack pointer to exit the function,
6855 insert some code to save and restore the stack pointer. */
6856 #ifdef EXIT_IGNORE_STACK
6857 if (! EXIT_IGNORE_STACK)
6859 if (current_function_calls_alloca)
6863 emit_stack_save (SAVE_FUNCTION, &tem, parm_birth_insn);
6864 emit_stack_restore (SAVE_FUNCTION, tem, NULL_RTX);
6867 /* If scalar return value was computed in a pseudo-reg, or was a named
6868 return value that got dumped to the stack, copy that to the hard
6870 if (DECL_RTL_SET_P (DECL_RESULT (current_function_decl)))
6872 tree decl_result = DECL_RESULT (current_function_decl);
6873 rtx decl_rtl = DECL_RTL (decl_result);
6875 if (REG_P (decl_rtl)
6876 ? REGNO (decl_rtl) >= FIRST_PSEUDO_REGISTER
6877 : DECL_REGISTER (decl_result))
6881 #ifdef FUNCTION_OUTGOING_VALUE
6882 real_decl_rtl = FUNCTION_OUTGOING_VALUE (TREE_TYPE (decl_result),
6883 current_function_decl);
6885 real_decl_rtl = FUNCTION_VALUE (TREE_TYPE (decl_result),
6886 current_function_decl);
6888 REG_FUNCTION_VALUE_P (real_decl_rtl) = 1;
6890 /* If this is a BLKmode structure being returned in registers,
6891 then use the mode computed in expand_return. Note that if
6892 decl_rtl is memory, then its mode may have been changed,
6893 but that current_function_return_rtx has not. */
6894 if (GET_MODE (real_decl_rtl) == BLKmode)
6895 PUT_MODE (real_decl_rtl, GET_MODE (current_function_return_rtx));
6897 /* If a named return value dumped decl_return to memory, then
6898 we may need to re-do the PROMOTE_MODE signed/unsigned
6900 if (GET_MODE (real_decl_rtl) != GET_MODE (decl_rtl))
6902 int unsignedp = TREE_UNSIGNED (TREE_TYPE (decl_result));
6904 #ifdef PROMOTE_FUNCTION_RETURN
6905 promote_mode (TREE_TYPE (decl_result), GET_MODE (decl_rtl),
6909 convert_move (real_decl_rtl, decl_rtl, unsignedp);
6911 else if (GET_CODE (real_decl_rtl) == PARALLEL)
6912 emit_group_load (real_decl_rtl, decl_rtl,
6913 int_size_in_bytes (TREE_TYPE (decl_result)),
6914 TYPE_ALIGN (TREE_TYPE (decl_result)));
6916 emit_move_insn (real_decl_rtl, decl_rtl);
6918 /* The delay slot scheduler assumes that current_function_return_rtx
6919 holds the hard register containing the return value, not a
6920 temporary pseudo. */
6921 current_function_return_rtx = real_decl_rtl;
6925 /* If returning a structure, arrange to return the address of the value
6926 in a place where debuggers expect to find it.
6928 If returning a structure PCC style,
6929 the caller also depends on this value.
6930 And current_function_returns_pcc_struct is not necessarily set. */
6931 if (current_function_returns_struct
6932 || current_function_returns_pcc_struct)
6935 = XEXP (DECL_RTL (DECL_RESULT (current_function_decl)), 0);
6936 tree type = TREE_TYPE (DECL_RESULT (current_function_decl));
6937 #ifdef FUNCTION_OUTGOING_VALUE
6939 = FUNCTION_OUTGOING_VALUE (build_pointer_type (type),
6940 current_function_decl);
6943 = FUNCTION_VALUE (build_pointer_type (type), current_function_decl);
6946 /* Mark this as a function return value so integrate will delete the
6947 assignment and USE below when inlining this function. */
6948 REG_FUNCTION_VALUE_P (outgoing) = 1;
6950 #ifdef POINTERS_EXTEND_UNSIGNED
6951 /* The address may be ptr_mode and OUTGOING may be Pmode. */
6952 if (GET_MODE (outgoing) != GET_MODE (value_address))
6953 value_address = convert_memory_address (GET_MODE (outgoing),
6957 emit_move_insn (outgoing, value_address);
6959 /* Show return register used to hold result (in this case the address
6961 current_function_return_rtx = outgoing;
6964 /* If this is an implementation of throw, do what's necessary to
6965 communicate between __builtin_eh_return and the epilogue. */
6966 expand_eh_return ();
6968 /* Emit the actual code to clobber return register. */
6973 clobber_return_register ();
6974 seq = gen_sequence ();
6977 after = emit_insn_after (seq, clobber_after);
6979 if (clobber_after != after)
6980 cfun->x_clobber_return_insn = after;
6983 /* ??? This should no longer be necessary since stupid is no longer with
6984 us, but there are some parts of the compiler (eg reload_combine, and
6985 sh mach_dep_reorg) that still try and compute their own lifetime info
6986 instead of using the general framework. */
6987 use_return_register ();
6989 /* Fix up any gotos that jumped out to the outermost
6990 binding level of the function.
6991 Must follow emitting RETURN_LABEL. */
6993 /* If you have any cleanups to do at this point,
6994 and they need to create temporary variables,
6995 then you will lose. */
6996 expand_fixups (get_insns ());
7000 get_arg_pointer_save_area (f)
7003 rtx ret = f->x_arg_pointer_save_area;
7007 ret = assign_stack_local_1 (Pmode, GET_MODE_SIZE (Pmode), 0, f);
7008 f->x_arg_pointer_save_area = ret;
7011 if (f == cfun && ! f->arg_pointer_save_area_init)
7015 /* Save the arg pointer at the beginning of the function. The
7016 generated stack slot may not be a valid memory address, so we
7017 have to check it and fix it if necessary. */
7019 emit_move_insn (validize_mem (ret), virtual_incoming_args_rtx);
7020 seq = gen_sequence ();
7023 push_topmost_sequence ();
7024 emit_insn_after (seq, get_insns ());
7025 pop_topmost_sequence ();
7031 /* Extend a vector that records the INSN_UIDs of INSNS (either a
7032 sequence or a single insn). */
7035 record_insns (insns, vecp)
7039 if (GET_CODE (insns) == SEQUENCE)
7041 int len = XVECLEN (insns, 0);
7042 int i = VARRAY_SIZE (*vecp);
7044 VARRAY_GROW (*vecp, i + len);
7047 VARRAY_INT (*vecp, i) = INSN_UID (XVECEXP (insns, 0, len));
7053 int i = VARRAY_SIZE (*vecp);
7054 VARRAY_GROW (*vecp, i + 1);
7055 VARRAY_INT (*vecp, i) = INSN_UID (insns);
7059 /* Determine how many INSN_UIDs in VEC are part of INSN. */
7062 contains (insn, vec)
7068 if (GET_CODE (insn) == INSN
7069 && GET_CODE (PATTERN (insn)) == SEQUENCE)
7072 for (i = XVECLEN (PATTERN (insn), 0) - 1; i >= 0; i--)
7073 for (j = VARRAY_SIZE (vec) - 1; j >= 0; --j)
7074 if (INSN_UID (XVECEXP (PATTERN (insn), 0, i)) == VARRAY_INT (vec, j))
7080 for (j = VARRAY_SIZE (vec) - 1; j >= 0; --j)
7081 if (INSN_UID (insn) == VARRAY_INT (vec, j))
7088 prologue_epilogue_contains (insn)
7091 if (contains (insn, prologue))
7093 if (contains (insn, epilogue))
7099 sibcall_epilogue_contains (insn)
7102 if (sibcall_epilogue)
7103 return contains (insn, sibcall_epilogue);
7108 /* Insert gen_return at the end of block BB. This also means updating
7109 block_for_insn appropriately. */
7112 emit_return_into_block (bb, line_note)
7118 p = NEXT_INSN (bb->end);
7119 end = emit_jump_insn_after (gen_return (), bb->end);
7121 emit_line_note_after (NOTE_SOURCE_FILE (line_note),
7122 NOTE_LINE_NUMBER (line_note), PREV_INSN (bb->end));
7124 #endif /* HAVE_return */
7126 #ifdef HAVE_epilogue
7128 /* Modify SEQ, a SEQUENCE that is part of the epilogue, to no modifications
7129 to the stack pointer. */
7132 keep_stack_depressed (seq)
7136 rtx sp_from_reg = 0;
7137 int sp_modified_unknown = 0;
7139 /* If the epilogue is just a single instruction, it's OK as is */
7141 if (GET_CODE (seq) != SEQUENCE)
7144 /* Scan all insns in SEQ looking for ones that modified the stack
7145 pointer. Record if it modified the stack pointer by copying it
7146 from the frame pointer or if it modified it in some other way.
7147 Then modify any subsequent stack pointer references to take that
7148 into account. We start by only allowing SP to be copied from a
7149 register (presumably FP) and then be subsequently referenced. */
7151 for (i = 0; i < XVECLEN (seq, 0); i++)
7153 rtx insn = XVECEXP (seq, 0, i);
7155 if (GET_RTX_CLASS (GET_CODE (insn)) != 'i')
7158 if (reg_set_p (stack_pointer_rtx, insn))
7160 rtx set = single_set (insn);
7162 /* If SP is set as a side-effect, we can't support this. */
7166 if (GET_CODE (SET_SRC (set)) == REG)
7167 sp_from_reg = SET_SRC (set);
7169 sp_modified_unknown = 1;
7171 /* Don't allow the SP modification to happen. We don't call
7172 delete_insn here since INSN isn't in any chain. */
7173 PUT_CODE (insn, NOTE);
7174 NOTE_LINE_NUMBER (insn) = NOTE_INSN_DELETED;
7175 NOTE_SOURCE_FILE (insn) = 0;
7177 else if (reg_referenced_p (stack_pointer_rtx, PATTERN (insn)))
7179 if (sp_modified_unknown)
7182 else if (sp_from_reg != 0)
7184 = replace_rtx (PATTERN (insn), stack_pointer_rtx, sp_from_reg);
7190 /* Generate the prologue and epilogue RTL if the machine supports it. Thread
7191 this into place with notes indicating where the prologue ends and where
7192 the epilogue begins. Update the basic block information when possible. */
7195 thread_prologue_and_epilogue_insns (f)
7196 rtx f ATTRIBUTE_UNUSED;
7200 #if defined (HAVE_sibcall_epilogue) || defined (HAVE_epilogue) || defined (HAVE_return) || defined (HAVE_prologue)
7203 #ifdef HAVE_prologue
7204 rtx prologue_end = NULL_RTX;
7206 #if defined (HAVE_epilogue) || defined(HAVE_return)
7207 rtx epilogue_end = NULL_RTX;
7210 #ifdef HAVE_prologue
7214 seq = gen_prologue ();
7217 /* Retain a map of the prologue insns. */
7218 if (GET_CODE (seq) != SEQUENCE)
7220 record_insns (seq, &prologue);
7221 prologue_end = emit_note (NULL, NOTE_INSN_PROLOGUE_END);
7223 seq = gen_sequence ();
7226 /* Can't deal with multiple successsors of the entry block
7227 at the moment. Function should always have at least one
7229 if (!ENTRY_BLOCK_PTR->succ || ENTRY_BLOCK_PTR->succ->succ_next)
7232 insert_insn_on_edge (seq, ENTRY_BLOCK_PTR->succ);
7237 /* If the exit block has no non-fake predecessors, we don't need
7239 for (e = EXIT_BLOCK_PTR->pred; e; e = e->pred_next)
7240 if ((e->flags & EDGE_FAKE) == 0)
7246 if (optimize && HAVE_return)
7248 /* If we're allowed to generate a simple return instruction,
7249 then by definition we don't need a full epilogue. Examine
7250 the block that falls through to EXIT. If it does not
7251 contain any code, examine its predecessors and try to
7252 emit (conditional) return instructions. */
7258 for (e = EXIT_BLOCK_PTR->pred; e; e = e->pred_next)
7259 if (e->flags & EDGE_FALLTHRU)
7265 /* Verify that there are no active instructions in the last block. */
7267 while (label && GET_CODE (label) != CODE_LABEL)
7269 if (active_insn_p (label))
7271 label = PREV_INSN (label);
7274 if (last->head == label && GET_CODE (label) == CODE_LABEL)
7276 rtx epilogue_line_note = NULL_RTX;
7278 /* Locate the line number associated with the closing brace,
7279 if we can find one. */
7280 for (seq = get_last_insn ();
7281 seq && ! active_insn_p (seq);
7282 seq = PREV_INSN (seq))
7283 if (GET_CODE (seq) == NOTE && NOTE_LINE_NUMBER (seq) > 0)
7285 epilogue_line_note = seq;
7289 for (e = last->pred; e; e = e_next)
7291 basic_block bb = e->src;
7294 e_next = e->pred_next;
7295 if (bb == ENTRY_BLOCK_PTR)
7299 if ((GET_CODE (jump) != JUMP_INSN) || JUMP_LABEL (jump) != label)
7302 /* If we have an unconditional jump, we can replace that
7303 with a simple return instruction. */
7304 if (simplejump_p (jump))
7306 emit_return_into_block (bb, epilogue_line_note);
7310 /* If we have a conditional jump, we can try to replace
7311 that with a conditional return instruction. */
7312 else if (condjump_p (jump))
7316 ret = SET_SRC (PATTERN (jump));
7317 if (GET_CODE (XEXP (ret, 1)) == LABEL_REF)
7318 loc = &XEXP (ret, 1);
7320 loc = &XEXP (ret, 2);
7321 ret = gen_rtx_RETURN (VOIDmode);
7323 if (! validate_change (jump, loc, ret, 0))
7325 if (JUMP_LABEL (jump))
7326 LABEL_NUSES (JUMP_LABEL (jump))--;
7328 /* If this block has only one successor, it both jumps
7329 and falls through to the fallthru block, so we can't
7331 if (bb->succ->succ_next == NULL)
7337 /* Fix up the CFG for the successful change we just made. */
7338 redirect_edge_succ (e, EXIT_BLOCK_PTR);
7341 /* Emit a return insn for the exit fallthru block. Whether
7342 this is still reachable will be determined later. */
7344 emit_barrier_after (last->end);
7345 emit_return_into_block (last, epilogue_line_note);
7346 epilogue_end = last->end;
7347 last->succ->flags &= ~EDGE_FALLTHRU;
7352 #ifdef HAVE_epilogue
7355 /* Find the edge that falls through to EXIT. Other edges may exist
7356 due to RETURN instructions, but those don't need epilogues.
7357 There really shouldn't be a mixture -- either all should have
7358 been converted or none, however... */
7360 for (e = EXIT_BLOCK_PTR->pred; e; e = e->pred_next)
7361 if (e->flags & EDGE_FALLTHRU)
7367 epilogue_end = emit_note (NULL, NOTE_INSN_EPILOGUE_BEG);
7369 seq = gen_epilogue ();
7371 /* If this function returns with the stack depressed, massage
7372 the epilogue to actually do that. */
7373 if (TREE_CODE (TREE_TYPE (current_function_decl)) == FUNCTION_TYPE
7374 && TYPE_RETURNS_STACK_DEPRESSED (TREE_TYPE (current_function_decl)))
7375 keep_stack_depressed (seq);
7377 emit_jump_insn (seq);
7379 /* Retain a map of the epilogue insns. */
7380 if (GET_CODE (seq) != SEQUENCE)
7382 record_insns (seq, &epilogue);
7384 seq = gen_sequence ();
7387 insert_insn_on_edge (seq, e);
7394 commit_edge_insertions ();
7396 #ifdef HAVE_sibcall_epilogue
7397 /* Emit sibling epilogues before any sibling call sites. */
7398 for (e = EXIT_BLOCK_PTR->pred; e; e = e->pred_next)
7400 basic_block bb = e->src;
7405 if (GET_CODE (insn) != CALL_INSN
7406 || ! SIBLING_CALL_P (insn))
7410 seq = gen_sibcall_epilogue ();
7413 i = PREV_INSN (insn);
7414 newinsn = emit_insn_before (seq, insn);
7416 /* Retain a map of the epilogue insns. Used in life analysis to
7417 avoid getting rid of sibcall epilogue insns. */
7418 record_insns (GET_CODE (seq) == SEQUENCE
7419 ? seq : newinsn, &sibcall_epilogue);
7423 #ifdef HAVE_prologue
7428 /* GDB handles `break f' by setting a breakpoint on the first
7429 line note after the prologue. Which means (1) that if
7430 there are line number notes before where we inserted the
7431 prologue we should move them, and (2) we should generate a
7432 note before the end of the first basic block, if there isn't
7435 ??? This behaviour is completely broken when dealing with
7436 multiple entry functions. We simply place the note always
7437 into first basic block and let alternate entry points
7441 for (insn = prologue_end; insn; insn = prev)
7443 prev = PREV_INSN (insn);
7444 if (GET_CODE (insn) == NOTE && NOTE_LINE_NUMBER (insn) > 0)
7446 /* Note that we cannot reorder the first insn in the
7447 chain, since rest_of_compilation relies on that
7448 remaining constant. */
7451 reorder_insns (insn, insn, prologue_end);
7455 /* Find the last line number note in the first block. */
7456 for (insn = BASIC_BLOCK (0)->end;
7457 insn != prologue_end && insn;
7458 insn = PREV_INSN (insn))
7459 if (GET_CODE (insn) == NOTE && NOTE_LINE_NUMBER (insn) > 0)
7462 /* If we didn't find one, make a copy of the first line number
7466 for (insn = next_active_insn (prologue_end);
7468 insn = PREV_INSN (insn))
7469 if (GET_CODE (insn) == NOTE && NOTE_LINE_NUMBER (insn) > 0)
7471 emit_line_note_after (NOTE_SOURCE_FILE (insn),
7472 NOTE_LINE_NUMBER (insn),
7479 #ifdef HAVE_epilogue
7484 /* Similarly, move any line notes that appear after the epilogue.
7485 There is no need, however, to be quite so anal about the existance
7487 for (insn = epilogue_end; insn; insn = next)
7489 next = NEXT_INSN (insn);
7490 if (GET_CODE (insn) == NOTE && NOTE_LINE_NUMBER (insn) > 0)
7491 reorder_insns (insn, insn, PREV_INSN (epilogue_end));
7497 /* Reposition the prologue-end and epilogue-begin notes after instruction
7498 scheduling and delayed branch scheduling. */
7501 reposition_prologue_and_epilogue_notes (f)
7502 rtx f ATTRIBUTE_UNUSED;
7504 #if defined (HAVE_prologue) || defined (HAVE_epilogue)
7507 if ((len = VARRAY_SIZE (prologue)) > 0)
7511 /* Scan from the beginning until we reach the last prologue insn.
7512 We apparently can't depend on basic_block_{head,end} after
7514 for (insn = f; len && insn; insn = NEXT_INSN (insn))
7516 if (GET_CODE (insn) == NOTE)
7518 if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_PROLOGUE_END)
7521 else if ((len -= contains (insn, prologue)) == 0)
7524 /* Find the prologue-end note if we haven't already, and
7525 move it to just after the last prologue insn. */
7528 for (note = insn; (note = NEXT_INSN (note));)
7529 if (GET_CODE (note) == NOTE
7530 && NOTE_LINE_NUMBER (note) == NOTE_INSN_PROLOGUE_END)
7534 next = NEXT_INSN (note);
7536 /* Whether or not we can depend on BLOCK_HEAD,
7537 attempt to keep it up-to-date. */
7538 if (BLOCK_HEAD (0) == note)
7539 BLOCK_HEAD (0) = next;
7542 /* Avoid placing note between CODE_LABEL and BASIC_BLOCK note. */
7543 if (GET_CODE (insn) == CODE_LABEL)
7544 insn = NEXT_INSN (insn);
7545 add_insn_after (note, insn);
7550 if ((len = VARRAY_SIZE (epilogue)) > 0)
7554 /* Scan from the end until we reach the first epilogue insn.
7555 We apparently can't depend on basic_block_{head,end} after
7557 for (insn = get_last_insn (); len && insn; insn = PREV_INSN (insn))
7559 if (GET_CODE (insn) == NOTE)
7561 if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_EPILOGUE_BEG)
7564 else if ((len -= contains (insn, epilogue)) == 0)
7566 /* Find the epilogue-begin note if we haven't already, and
7567 move it to just before the first epilogue insn. */
7570 for (note = insn; (note = PREV_INSN (note));)
7571 if (GET_CODE (note) == NOTE
7572 && NOTE_LINE_NUMBER (note) == NOTE_INSN_EPILOGUE_BEG)
7576 /* Whether or not we can depend on BLOCK_HEAD,
7577 attempt to keep it up-to-date. */
7579 && BLOCK_HEAD (n_basic_blocks-1) == insn)
7580 BLOCK_HEAD (n_basic_blocks-1) = note;
7583 add_insn_before (note, insn);
7587 #endif /* HAVE_prologue or HAVE_epilogue */
7590 /* Mark P for GC. */
7593 mark_function_status (p)
7596 struct var_refs_queue *q;
7597 struct temp_slot *t;
7604 ggc_mark_rtx (p->arg_offset_rtx);
7606 if (p->x_parm_reg_stack_loc)
7607 for (i = p->x_max_parm_reg, r = p->x_parm_reg_stack_loc;
7611 ggc_mark_rtx (p->return_rtx);
7612 ggc_mark_rtx (p->x_cleanup_label);
7613 ggc_mark_rtx (p->x_return_label);
7614 ggc_mark_rtx (p->x_save_expr_regs);
7615 ggc_mark_rtx (p->x_stack_slot_list);
7616 ggc_mark_rtx (p->x_parm_birth_insn);
7617 ggc_mark_rtx (p->x_tail_recursion_label);
7618 ggc_mark_rtx (p->x_tail_recursion_reentry);
7619 ggc_mark_rtx (p->internal_arg_pointer);
7620 ggc_mark_rtx (p->x_arg_pointer_save_area);
7621 ggc_mark_tree (p->x_rtl_expr_chain);
7622 ggc_mark_rtx (p->x_last_parm_insn);
7623 ggc_mark_tree (p->x_context_display);
7624 ggc_mark_tree (p->x_trampoline_list);
7625 ggc_mark_rtx (p->epilogue_delay_list);
7626 ggc_mark_rtx (p->x_clobber_return_insn);
7628 for (t = p->x_temp_slots; t != 0; t = t->next)
7631 ggc_mark_rtx (t->slot);
7632 ggc_mark_rtx (t->address);
7633 ggc_mark_tree (t->rtl_expr);
7634 ggc_mark_tree (t->type);
7637 for (q = p->fixup_var_refs_queue; q != 0; q = q->next)
7640 ggc_mark_rtx (q->modified);
7643 ggc_mark_rtx (p->x_nonlocal_goto_handler_slots);
7644 ggc_mark_rtx (p->x_nonlocal_goto_handler_labels);
7645 ggc_mark_rtx (p->x_nonlocal_goto_stack_level);
7646 ggc_mark_tree (p->x_nonlocal_labels);
7648 mark_hard_reg_initial_vals (p);
7651 /* Mark the struct function pointed to by *ARG for GC, if it is not
7652 NULL. This is used to mark the current function and the outer
7656 maybe_mark_struct_function (arg)
7659 struct function *f = *(struct function **) arg;
7664 ggc_mark_struct_function (f);
7667 /* Mark a struct function * for GC. This is called from ggc-common.c. */
7670 ggc_mark_struct_function (f)
7674 ggc_mark_tree (f->decl);
7676 mark_function_status (f);
7677 mark_eh_status (f->eh);
7678 mark_stmt_status (f->stmt);
7679 mark_expr_status (f->expr);
7680 mark_emit_status (f->emit);
7681 mark_varasm_status (f->varasm);
7683 if (mark_machine_status)
7684 (*mark_machine_status) (f);
7685 if (mark_lang_status)
7686 (*mark_lang_status) (f);
7688 if (f->original_arg_vector)
7689 ggc_mark_rtvec ((rtvec) f->original_arg_vector);
7690 if (f->original_decl_initial)
7691 ggc_mark_tree (f->original_decl_initial);
7693 ggc_mark_struct_function (f->outer);
7696 /* Called once, at initialization, to initialize function.c. */
7699 init_function_once ()
7701 ggc_add_root (&cfun, 1, sizeof cfun, maybe_mark_struct_function);
7702 ggc_add_root (&outer_function_chain, 1, sizeof outer_function_chain,
7703 maybe_mark_struct_function);
7705 VARRAY_INT_INIT (prologue, 0, "prologue");
7706 VARRAY_INT_INIT (epilogue, 0, "epilogue");
7707 VARRAY_INT_INIT (sibcall_epilogue, 0, "sibcall_epilogue");