1 /* Convert function calls to rtl insns, for GNU C compiler.
2 Copyright (C) 1989, 92-97, 1998 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
33 #include "insn-flags.h"
35 /* Decide whether a function's arguments should be processed
36 from first to last or from last to first.
38 They should if the stack and args grow in opposite directions, but
39 only if we have push insns. */
43 #if defined (STACK_GROWS_DOWNWARD) != defined (ARGS_GROW_DOWNWARD)
44 #define PUSH_ARGS_REVERSED /* If it's last to first */
49 /* Like STACK_BOUNDARY but in units of bytes, not bits. */
50 #define STACK_BYTES (STACK_BOUNDARY / BITS_PER_UNIT)
52 /* Data structure and subroutines used within expand_call. */
56 /* Tree node for this argument. */
58 /* Mode for value; TYPE_MODE unless promoted. */
59 enum machine_mode mode;
60 /* Current RTL value for argument, or 0 if it isn't precomputed. */
62 /* Initially-compute RTL value for argument; only for const functions. */
64 /* Register to pass this argument in, 0 if passed on stack, or an
65 PARALLEL if the arg is to be copied into multiple non-contiguous
68 /* If REG was promoted from the actual mode of the argument expression,
69 indicates whether the promotion is sign- or zero-extended. */
71 /* Number of registers to use. 0 means put the whole arg in registers.
72 Also 0 if not passed in registers. */
74 /* Non-zero if argument must be passed on stack.
75 Note that some arguments may be passed on the stack
76 even though pass_on_stack is zero, just because FUNCTION_ARG says so.
77 pass_on_stack identifies arguments that *cannot* go in registers. */
79 /* Offset of this argument from beginning of stack-args. */
80 struct args_size offset;
81 /* Similar, but offset to the start of the stack slot. Different from
82 OFFSET if this arg pads downward. */
83 struct args_size slot_offset;
84 /* Size of this argument on the stack, rounded up for any padding it gets,
85 parts of the argument passed in registers do not count.
86 If REG_PARM_STACK_SPACE is defined, then register parms
87 are counted here as well. */
88 struct args_size size;
89 /* Location on the stack at which parameter should be stored. The store
90 has already been done if STACK == VALUE. */
92 /* Location on the stack of the start of this argument slot. This can
93 differ from STACK if this arg pads downward. This location is known
94 to be aligned to FUNCTION_ARG_BOUNDARY. */
96 #ifdef ACCUMULATE_OUTGOING_ARGS
97 /* Place that this stack area has been saved, if needed. */
100 /* If an argument's alignment does not permit direct copying into registers,
101 copy in smaller-sized pieces into pseudos. These are stored in a
102 block pointed to by this field. The next field says how many
103 word-sized pseudos we made. */
108 #ifdef ACCUMULATE_OUTGOING_ARGS
109 /* A vector of one char per byte of stack space. A byte if non-zero if
110 the corresponding stack location has been used.
111 This vector is used to prevent a function call within an argument from
112 clobbering any stack already set up. */
113 static char *stack_usage_map;
115 /* Size of STACK_USAGE_MAP. */
116 static int highest_outgoing_arg_in_use;
118 /* stack_arg_under_construction is nonzero when an argument may be
119 initialized with a constructor call (including a C function that
120 returns a BLKmode struct) and expand_call must take special action
121 to make sure the object being constructed does not overlap the
122 argument list for the constructor call. */
123 int stack_arg_under_construction;
126 static int calls_function PROTO((tree, int));
127 static int calls_function_1 PROTO((tree, int));
128 static void emit_call_1 PROTO((rtx, tree, tree, int, int, rtx, rtx,
130 static void store_one_arg PROTO ((struct arg_data *, rtx, int, int,
133 /* If WHICH is 1, return 1 if EXP contains a call to the built-in function
136 If WHICH is 0, return 1 if EXP contains a call to any function.
137 Actually, we only need return 1 if evaluating EXP would require pushing
138 arguments on the stack, but that is too difficult to compute, so we just
139 assume any function call might require the stack. */
141 static tree calls_function_save_exprs;
144 calls_function (exp, which)
149 calls_function_save_exprs = 0;
150 val = calls_function_1 (exp, which);
151 calls_function_save_exprs = 0;
156 calls_function_1 (exp, which)
161 enum tree_code code = TREE_CODE (exp);
162 int type = TREE_CODE_CLASS (code);
163 int length = tree_code_length[(int) code];
165 /* If this code is language-specific, we don't know what it will do. */
166 if ((int) code >= NUM_TREE_CODES)
169 /* Only expressions and references can contain calls. */
170 if (type != 'e' && type != '<' && type != '1' && type != '2' && type != 'r'
179 else if (TREE_CODE (TREE_OPERAND (exp, 0)) == ADDR_EXPR
180 && (TREE_CODE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0))
183 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
185 if ((DECL_BUILT_IN (fndecl)
186 && DECL_FUNCTION_CODE (fndecl) == BUILT_IN_ALLOCA)
187 || (DECL_SAVED_INSNS (fndecl)
188 && (FUNCTION_FLAGS (DECL_SAVED_INSNS (fndecl))
189 & FUNCTION_FLAGS_CALLS_ALLOCA)))
193 /* Third operand is RTL. */
198 if (SAVE_EXPR_RTL (exp) != 0)
200 if (value_member (exp, calls_function_save_exprs))
202 calls_function_save_exprs = tree_cons (NULL_TREE, exp,
203 calls_function_save_exprs);
204 return (TREE_OPERAND (exp, 0) != 0
205 && calls_function_1 (TREE_OPERAND (exp, 0), which));
211 for (local = BLOCK_VARS (exp); local; local = TREE_CHAIN (local))
212 if (DECL_INITIAL (local) != 0
213 && calls_function_1 (DECL_INITIAL (local), which))
217 register tree subblock;
219 for (subblock = BLOCK_SUBBLOCKS (exp);
221 subblock = TREE_CHAIN (subblock))
222 if (calls_function_1 (subblock, which))
227 case METHOD_CALL_EXPR:
231 case WITH_CLEANUP_EXPR:
242 for (i = 0; i < length; i++)
243 if (TREE_OPERAND (exp, i) != 0
244 && calls_function_1 (TREE_OPERAND (exp, i), which))
250 /* Force FUNEXP into a form suitable for the address of a CALL,
251 and return that as an rtx. Also load the static chain register
252 if FNDECL is a nested function.
254 CALL_FUSAGE points to a variable holding the prospective
255 CALL_INSN_FUNCTION_USAGE information. */
258 prepare_call_address (funexp, fndecl, call_fusage, reg_parm_seen)
264 rtx static_chain_value = 0;
266 funexp = protect_from_queue (funexp, 0);
269 /* Get possible static chain value for nested function in C. */
270 static_chain_value = lookup_static_chain (fndecl);
272 /* Make a valid memory address and copy constants thru pseudo-regs,
273 but not for a constant address if -fno-function-cse. */
274 if (GET_CODE (funexp) != SYMBOL_REF)
275 /* If we are using registers for parameters, force the
276 function address into a register now. */
277 funexp = ((SMALL_REGISTER_CLASSES && reg_parm_seen)
278 ? force_not_mem (memory_address (FUNCTION_MODE, funexp))
279 : memory_address (FUNCTION_MODE, funexp));
282 #ifndef NO_FUNCTION_CSE
283 if (optimize && ! flag_no_function_cse)
284 #ifdef NO_RECURSIVE_FUNCTION_CSE
285 if (fndecl != current_function_decl)
287 funexp = force_reg (Pmode, funexp);
291 if (static_chain_value != 0)
293 emit_move_insn (static_chain_rtx, static_chain_value);
295 if (GET_CODE (static_chain_rtx) == REG)
296 use_reg (call_fusage, static_chain_rtx);
302 /* Generate instructions to call function FUNEXP,
303 and optionally pop the results.
304 The CALL_INSN is the first insn generated.
306 FNDECL is the declaration node of the function. This is given to the
307 macro RETURN_POPS_ARGS to determine whether this function pops its own args.
309 FUNTYPE is the data type of the function. This is given to the macro
310 RETURN_POPS_ARGS to determine whether this function pops its own args.
311 We used to allow an identifier for library functions, but that doesn't
312 work when the return type is an aggregate type and the calling convention
313 says that the pointer to this aggregate is to be popped by the callee.
315 STACK_SIZE is the number of bytes of arguments on the stack,
316 rounded up to STACK_BOUNDARY; zero if the size is variable.
317 This is both to put into the call insn and
318 to generate explicit popping code if necessary.
320 STRUCT_VALUE_SIZE is the number of bytes wanted in a structure value.
321 It is zero if this call doesn't want a structure value.
323 NEXT_ARG_REG is the rtx that results from executing
324 FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1)
325 just after all the args have had their registers assigned.
326 This could be whatever you like, but normally it is the first
327 arg-register beyond those used for args in this call,
328 or 0 if all the arg-registers are used in this call.
329 It is passed on to `gen_call' so you can put this info in the call insn.
331 VALREG is a hard register in which a value is returned,
332 or 0 if the call does not return a value.
334 OLD_INHIBIT_DEFER_POP is the value that `inhibit_defer_pop' had before
335 the args to this call were processed.
336 We restore `inhibit_defer_pop' to that value.
338 CALL_FUSAGE is either empty or an EXPR_LIST of USE expressions that
339 denote registers used by the called function.
341 IS_CONST is true if this is a `const' call. */
344 emit_call_1 (funexp, fndecl, funtype, stack_size, struct_value_size,
345 next_arg_reg, valreg, old_inhibit_defer_pop, call_fusage,
351 int struct_value_size;
354 int old_inhibit_defer_pop;
358 rtx stack_size_rtx = GEN_INT (stack_size);
359 rtx struct_value_size_rtx = GEN_INT (struct_value_size);
361 int already_popped = 0;
363 /* Ensure address is valid. SYMBOL_REF is already valid, so no need,
364 and we don't want to load it into a register as an optimization,
365 because prepare_call_address already did it if it should be done. */
366 if (GET_CODE (funexp) != SYMBOL_REF)
367 funexp = memory_address (FUNCTION_MODE, funexp);
369 #ifndef ACCUMULATE_OUTGOING_ARGS
370 #if defined (HAVE_call_pop) && defined (HAVE_call_value_pop)
371 if (HAVE_call_pop && HAVE_call_value_pop
372 && (RETURN_POPS_ARGS (fndecl, funtype, stack_size) > 0
375 rtx n_pop = GEN_INT (RETURN_POPS_ARGS (fndecl, funtype, stack_size));
378 /* If this subroutine pops its own args, record that in the call insn
379 if possible, for the sake of frame pointer elimination. */
382 pat = gen_call_value_pop (valreg,
383 gen_rtx_MEM (FUNCTION_MODE, funexp),
384 stack_size_rtx, next_arg_reg, n_pop);
386 pat = gen_call_pop (gen_rtx_MEM (FUNCTION_MODE, funexp),
387 stack_size_rtx, next_arg_reg, n_pop);
389 emit_call_insn (pat);
396 #if defined (HAVE_call) && defined (HAVE_call_value)
397 if (HAVE_call && HAVE_call_value)
400 emit_call_insn (gen_call_value (valreg,
401 gen_rtx_MEM (FUNCTION_MODE, funexp),
402 stack_size_rtx, next_arg_reg,
405 emit_call_insn (gen_call (gen_rtx_MEM (FUNCTION_MODE, funexp),
406 stack_size_rtx, next_arg_reg,
407 struct_value_size_rtx));
413 /* Find the CALL insn we just emitted. */
414 for (call_insn = get_last_insn ();
415 call_insn && GET_CODE (call_insn) != CALL_INSN;
416 call_insn = PREV_INSN (call_insn))
422 /* Put the register usage information on the CALL. If there is already
423 some usage information, put ours at the end. */
424 if (CALL_INSN_FUNCTION_USAGE (call_insn))
428 for (link = CALL_INSN_FUNCTION_USAGE (call_insn); XEXP (link, 1) != 0;
429 link = XEXP (link, 1))
432 XEXP (link, 1) = call_fusage;
435 CALL_INSN_FUNCTION_USAGE (call_insn) = call_fusage;
437 /* If this is a const call, then set the insn's unchanging bit. */
439 CONST_CALL_P (call_insn) = 1;
441 /* Restore this now, so that we do defer pops for this call's args
442 if the context of the call as a whole permits. */
443 inhibit_defer_pop = old_inhibit_defer_pop;
445 #ifndef ACCUMULATE_OUTGOING_ARGS
446 /* If returning from the subroutine does not automatically pop the args,
447 we need an instruction to pop them sooner or later.
448 Perhaps do it now; perhaps just record how much space to pop later.
450 If returning from the subroutine does pop the args, indicate that the
451 stack pointer will be changed. */
453 if (stack_size != 0 && RETURN_POPS_ARGS (fndecl, funtype, stack_size) > 0)
456 CALL_INSN_FUNCTION_USAGE (call_insn)
457 = gen_rtx_EXPR_LIST (VOIDmode,
458 gen_rtx_CLOBBER (VOIDmode, stack_pointer_rtx),
459 CALL_INSN_FUNCTION_USAGE (call_insn));
460 stack_size -= RETURN_POPS_ARGS (fndecl, funtype, stack_size);
461 stack_size_rtx = GEN_INT (stack_size);
466 if (flag_defer_pop && inhibit_defer_pop == 0 && !is_const)
467 pending_stack_adjust += stack_size;
469 adjust_stack (stack_size_rtx);
474 /* Generate all the code for a function call
475 and return an rtx for its value.
476 Store the value in TARGET (specified as an rtx) if convenient.
477 If the value is stored in TARGET then TARGET is returned.
478 If IGNORE is nonzero, then we ignore the value of the function call. */
481 expand_call (exp, target, ignore)
486 /* List of actual parameters. */
487 tree actparms = TREE_OPERAND (exp, 1);
488 /* RTX for the function to be called. */
490 /* Data type of the function. */
492 /* Declaration of the function being called,
493 or 0 if the function is computed (not known by name). */
497 /* Register in which non-BLKmode value will be returned,
498 or 0 if no value or if value is BLKmode. */
500 /* Address where we should return a BLKmode value;
501 0 if value not BLKmode. */
502 rtx structure_value_addr = 0;
503 /* Nonzero if that address is being passed by treating it as
504 an extra, implicit first parameter. Otherwise,
505 it is passed by being copied directly into struct_value_rtx. */
506 int structure_value_addr_parm = 0;
507 /* Size of aggregate value wanted, or zero if none wanted
508 or if we are using the non-reentrant PCC calling convention
509 or expecting the value in registers. */
510 int struct_value_size = 0;
511 /* Nonzero if called function returns an aggregate in memory PCC style,
512 by returning the address of where to find it. */
513 int pcc_struct_value = 0;
515 /* Number of actual parameters in this call, including struct value addr. */
517 /* Number of named args. Args after this are anonymous ones
518 and they must all go on the stack. */
520 /* Count arg position in order args appear. */
523 /* Vector of information about each argument.
524 Arguments are numbered in the order they will be pushed,
525 not the order they are written. */
526 struct arg_data *args;
528 /* Total size in bytes of all the stack-parms scanned so far. */
529 struct args_size args_size;
530 /* Size of arguments before any adjustments (such as rounding). */
531 struct args_size original_args_size;
532 /* Data on reg parms scanned so far. */
533 CUMULATIVE_ARGS args_so_far;
534 /* Nonzero if a reg parm has been scanned. */
536 /* Nonzero if this is an indirect function call. */
538 /* Nonzero if we must avoid push-insns in the args for this call.
539 If stack space is allocated for register parameters, but not by the
540 caller, then it is preallocated in the fixed part of the stack frame.
541 So the entire argument block must then be preallocated (i.e., we
542 ignore PUSH_ROUNDING in that case). */
544 #if defined(REG_PARM_STACK_SPACE) && ! defined(OUTGOING_REG_PARM_STACK_SPACE)
545 int must_preallocate = 1;
548 int must_preallocate = 0;
550 int must_preallocate = 1;
554 /* Size of the stack reserved for parameter registers. */
555 int reg_parm_stack_space = 0;
557 /* 1 if scanning parms front to back, -1 if scanning back to front. */
559 /* Address of space preallocated for stack parms
560 (on machines that lack push insns), or 0 if space not preallocated. */
563 /* Nonzero if it is plausible that this is a call to alloca. */
565 /* Nonzero if this is a call to malloc or a related function. */
567 /* Nonzero if this is a call to setjmp or a related function. */
569 /* Nonzero if this is a call to `longjmp'. */
571 /* Nonzero if this is a call to an inline function. */
572 int is_integrable = 0;
573 /* Nonzero if this is a call to a `const' function.
574 Note that only explicitly named functions are handled as `const' here. */
576 /* Nonzero if this is a call to a `volatile' function. */
578 #if defined(ACCUMULATE_OUTGOING_ARGS) && defined(REG_PARM_STACK_SPACE)
579 /* Define the boundary of the register parm stack space that needs to be
581 int low_to_save = -1, high_to_save;
582 rtx save_area = 0; /* Place that it is saved */
585 #ifdef ACCUMULATE_OUTGOING_ARGS
586 int initial_highest_arg_in_use = highest_outgoing_arg_in_use;
587 char *initial_stack_usage_map = stack_usage_map;
588 int old_stack_arg_under_construction;
591 rtx old_stack_level = 0;
592 int old_pending_adj = 0;
593 int old_inhibit_defer_pop = inhibit_defer_pop;
598 /* The value of the function call can be put in a hard register. But
599 if -fcheck-memory-usage, code which invokes functions (and thus
600 damages some hard registers) can be inserted before using the value.
601 So, target is always a pseudo-register in that case. */
602 if (flag_check_memory_usage)
605 /* See if we can find a DECL-node for the actual function.
606 As a result, decide whether this is a call to an integrable function. */
608 p = TREE_OPERAND (exp, 0);
609 if (TREE_CODE (p) == ADDR_EXPR)
611 fndecl = TREE_OPERAND (p, 0);
612 if (TREE_CODE (fndecl) != FUNCTION_DECL)
617 && fndecl != current_function_decl
618 && DECL_INLINE (fndecl)
619 && DECL_SAVED_INSNS (fndecl)
620 && RTX_INTEGRATED_P (DECL_SAVED_INSNS (fndecl)))
622 else if (! TREE_ADDRESSABLE (fndecl))
624 /* In case this function later becomes inlinable,
625 record that there was already a non-inline call to it.
627 Use abstraction instead of setting TREE_ADDRESSABLE
629 if (DECL_INLINE (fndecl) && warn_inline && !flag_no_inline
632 warning_with_decl (fndecl, "can't inline call to `%s'");
633 warning ("called from here");
635 mark_addressable (fndecl);
638 if (TREE_READONLY (fndecl) && ! TREE_THIS_VOLATILE (fndecl)
639 && TYPE_MODE (TREE_TYPE (exp)) != VOIDmode)
642 if (TREE_THIS_VOLATILE (fndecl))
647 /* If we don't have specific function to call, see if we have a
648 constant or `noreturn' function from the type. */
651 is_const = TREE_READONLY (TREE_TYPE (TREE_TYPE (p)));
652 is_volatile = TREE_THIS_VOLATILE (TREE_TYPE (TREE_TYPE (p)));
655 #ifdef REG_PARM_STACK_SPACE
656 #ifdef MAYBE_REG_PARM_STACK_SPACE
657 reg_parm_stack_space = MAYBE_REG_PARM_STACK_SPACE;
659 reg_parm_stack_space = REG_PARM_STACK_SPACE (fndecl);
663 /* Warn if this value is an aggregate type,
664 regardless of which calling convention we are using for it. */
665 if (warn_aggregate_return && AGGREGATE_TYPE_P (TREE_TYPE (exp)))
666 warning ("function call has aggregate value");
668 /* Set up a place to return a structure. */
670 /* Cater to broken compilers. */
671 if (aggregate_value_p (exp))
673 /* This call returns a big structure. */
676 #ifdef PCC_STATIC_STRUCT_RETURN
678 pcc_struct_value = 1;
679 /* Easier than making that case work right. */
682 /* In case this is a static function, note that it has been
684 if (! TREE_ADDRESSABLE (fndecl))
685 mark_addressable (fndecl);
689 #else /* not PCC_STATIC_STRUCT_RETURN */
691 struct_value_size = int_size_in_bytes (TREE_TYPE (exp));
693 if (target && GET_CODE (target) == MEM)
694 structure_value_addr = XEXP (target, 0);
697 /* Assign a temporary to hold the value. */
700 /* For variable-sized objects, we must be called with a target
701 specified. If we were to allocate space on the stack here,
702 we would have no way of knowing when to free it. */
704 if (struct_value_size < 0)
707 /* This DECL is just something to feed to mark_addressable;
708 it doesn't get pushed. */
709 d = build_decl (VAR_DECL, NULL_TREE, TREE_TYPE (exp));
710 DECL_RTL (d) = assign_temp (TREE_TYPE (exp), 1, 0, 1);
711 mark_addressable (d);
712 structure_value_addr = XEXP (DECL_RTL (d), 0);
713 MEM_IN_STRUCT_P (structure_value_addr)
714 = AGGREGATE_TYPE_P (TREE_TYPE (exp));
718 #endif /* not PCC_STATIC_STRUCT_RETURN */
721 /* If called function is inline, try to integrate it. */
726 #ifdef ACCUMULATE_OUTGOING_ARGS
727 rtx before_call = get_last_insn ();
730 temp = expand_inline_function (fndecl, actparms, target,
731 ignore, TREE_TYPE (exp),
732 structure_value_addr);
734 /* If inlining succeeded, return. */
735 if (temp != (rtx) (HOST_WIDE_INT) -1)
737 #ifdef ACCUMULATE_OUTGOING_ARGS
738 /* If the outgoing argument list must be preserved, push
739 the stack before executing the inlined function if it
742 for (i = reg_parm_stack_space - 1; i >= 0; i--)
743 if (i < highest_outgoing_arg_in_use && stack_usage_map[i] != 0)
746 if (stack_arg_under_construction || i >= 0)
749 = before_call ? NEXT_INSN (before_call) : get_insns ();
752 /* Look for a call in the inline function code.
753 If OUTGOING_ARGS_SIZE (DECL_SAVED_INSNS (fndecl)) is
754 nonzero then there is a call and it is not necessary
755 to scan the insns. */
757 if (OUTGOING_ARGS_SIZE (DECL_SAVED_INSNS (fndecl)) == 0)
758 for (insn = first_insn; insn; insn = NEXT_INSN (insn))
759 if (GET_CODE (insn) == CALL_INSN)
764 /* Reserve enough stack space so that the largest
765 argument list of any function call in the inline
766 function does not overlap the argument list being
767 evaluated. This is usually an overestimate because
768 allocate_dynamic_stack_space reserves space for an
769 outgoing argument list in addition to the requested
770 space, but there is no way to ask for stack space such
771 that an argument list of a certain length can be
772 safely constructed. */
774 int adjust = OUTGOING_ARGS_SIZE (DECL_SAVED_INSNS (fndecl));
775 #ifdef REG_PARM_STACK_SPACE
776 /* Add the stack space reserved for register arguments
777 in the inline function. What is really needed is the
778 largest value of reg_parm_stack_space in the inline
779 function, but that is not available. Using the current
780 value of reg_parm_stack_space is wrong, but gives
781 correct results on all supported machines. */
782 adjust += reg_parm_stack_space;
785 emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX);
786 allocate_dynamic_stack_space (GEN_INT (adjust),
787 NULL_RTX, BITS_PER_UNIT);
790 emit_insns_before (seq, first_insn);
791 emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX);
796 /* If the result is equivalent to TARGET, return TARGET to simplify
797 checks in store_expr. They can be equivalent but not equal in the
798 case of a function that returns BLKmode. */
799 if (temp != target && rtx_equal_p (temp, target))
804 /* If inlining failed, mark FNDECL as needing to be compiled
805 separately after all. If function was declared inline,
807 if (DECL_INLINE (fndecl) && warn_inline && !flag_no_inline
808 && optimize > 0 && ! TREE_ADDRESSABLE (fndecl))
810 warning_with_decl (fndecl, "inlining failed in call to `%s'");
811 warning ("called from here");
813 mark_addressable (fndecl);
816 /* When calling a const function, we must pop the stack args right away,
817 so that the pop is deleted or moved with the call. */
821 function_call_count++;
823 if (fndecl && DECL_NAME (fndecl))
824 name = IDENTIFIER_POINTER (DECL_NAME (fndecl));
827 /* Unless it's a call to a specific function that isn't alloca,
828 if it has one argument, we must assume it might be alloca. */
831 = (!(fndecl != 0 && strcmp (name, "alloca"))
833 && TREE_CHAIN (actparms) == 0);
835 /* We assume that alloca will always be called by name. It
836 makes no sense to pass it as a pointer-to-function to
837 anything that does not understand its behavior. */
839 = (name && ((IDENTIFIER_LENGTH (DECL_NAME (fndecl)) == 6
841 && ! strcmp (name, "alloca"))
842 || (IDENTIFIER_LENGTH (DECL_NAME (fndecl)) == 16
844 && ! strcmp (name, "__builtin_alloca"))));
847 /* See if this is a call to a function that can return more than once
848 or a call to longjmp. */
854 if (name != 0 && IDENTIFIER_LENGTH (DECL_NAME (fndecl)) <= 15
855 /* Exclude functions not at the file scope, or not `extern',
856 since they are not the magic functions we would otherwise
858 && DECL_CONTEXT (fndecl) == NULL_TREE && TREE_PUBLIC (fndecl))
862 /* Disregard prefix _, __ or __x. */
865 if (name[1] == '_' && name[2] == 'x')
867 else if (name[1] == '_')
877 && (! strcmp (tname, "setjmp")
878 || ! strcmp (tname, "setjmp_syscall")))
880 && ! strcmp (tname, "sigsetjmp"))
882 && ! strcmp (tname, "savectx")));
884 && ! strcmp (tname, "siglongjmp"))
887 else if ((tname[0] == 'q' && tname[1] == 's'
888 && ! strcmp (tname, "qsetjmp"))
889 || (tname[0] == 'v' && tname[1] == 'f'
890 && ! strcmp (tname, "vfork")))
893 else if (tname[0] == 'l' && tname[1] == 'o'
894 && ! strcmp (tname, "longjmp"))
896 /* XXX should have "malloc" attribute on functions instead
897 of recognizing them by name. */
898 else if (! strcmp (tname, "malloc")
899 || ! strcmp (tname, "calloc")
900 || ! strcmp (tname, "realloc")
901 || ! strcmp (tname, "__builtin_new")
902 || ! strcmp (tname, "__builtin_vec_new"))
907 current_function_calls_alloca = 1;
909 /* Don't let pending stack adjusts add up to too much.
910 Also, do all pending adjustments now
911 if there is any chance this might be a call to alloca. */
913 if (pending_stack_adjust >= 32
914 || (pending_stack_adjust > 0 && may_be_alloca))
915 do_pending_stack_adjust ();
917 /* Operand 0 is a pointer-to-function; get the type of the function. */
918 funtype = TREE_TYPE (TREE_OPERAND (exp, 0));
919 if (TREE_CODE (funtype) != POINTER_TYPE)
921 funtype = TREE_TYPE (funtype);
923 /* Push the temporary stack slot level so that we can free any temporaries
927 /* Start updating where the next arg would go.
929 On some machines (such as the PA) indirect calls have a different
930 calling convention than normal calls. The last argument in
931 INIT_CUMULATIVE_ARGS tells the backend if this is an indirect call
933 INIT_CUMULATIVE_ARGS (args_so_far, funtype, NULL_RTX, (fndecl == 0));
935 /* If struct_value_rtx is 0, it means pass the address
936 as if it were an extra parameter. */
937 if (structure_value_addr && struct_value_rtx == 0)
939 /* If structure_value_addr is a REG other than
940 virtual_outgoing_args_rtx, we can use always use it. If it
941 is not a REG, we must always copy it into a register.
942 If it is virtual_outgoing_args_rtx, we must copy it to another
943 register in some cases. */
944 rtx temp = (GET_CODE (structure_value_addr) != REG
945 #ifdef ACCUMULATE_OUTGOING_ARGS
946 || (stack_arg_under_construction
947 && structure_value_addr == virtual_outgoing_args_rtx)
949 ? copy_addr_to_reg (structure_value_addr)
950 : structure_value_addr);
953 = tree_cons (error_mark_node,
954 make_tree (build_pointer_type (TREE_TYPE (funtype)),
957 structure_value_addr_parm = 1;
960 /* Count the arguments and set NUM_ACTUALS. */
961 for (p = actparms, i = 0; p; p = TREE_CHAIN (p)) i++;
964 /* Compute number of named args.
965 Normally, don't include the last named arg if anonymous args follow.
966 We do include the last named arg if STRICT_ARGUMENT_NAMING is defined.
967 (If no anonymous args follow, the result of list_length is actually
968 one too large. This is harmless.)
970 If SETUP_INCOMING_VARARGS is defined and STRICT_ARGUMENT_NAMING is not,
971 this machine will be able to place unnamed args that were passed in
972 registers into the stack. So treat all args as named. This allows the
973 insns emitting for a specific argument list to be independent of the
974 function declaration.
976 If SETUP_INCOMING_VARARGS is not defined, we do not have any reliable
977 way to pass unnamed args in registers, so we must force them into
979 #if !defined(SETUP_INCOMING_VARARGS) || defined(STRICT_ARGUMENT_NAMING)
980 if (TYPE_ARG_TYPES (funtype) != 0)
982 = (list_length (TYPE_ARG_TYPES (funtype))
983 #ifndef STRICT_ARGUMENT_NAMING
984 /* Don't include the last named arg. */
987 /* Count the struct value address, if it is passed as a parm. */
988 + structure_value_addr_parm);
991 /* If we know nothing, treat all args as named. */
992 n_named_args = num_actuals;
994 /* Make a vector to hold all the information about each arg. */
995 args = (struct arg_data *) alloca (num_actuals * sizeof (struct arg_data));
996 bzero ((char *) args, num_actuals * sizeof (struct arg_data));
998 args_size.constant = 0;
1001 /* In this loop, we consider args in the order they are written.
1002 We fill up ARGS from the front or from the back if necessary
1003 so that in any case the first arg to be pushed ends up at the front. */
1005 #ifdef PUSH_ARGS_REVERSED
1006 i = num_actuals - 1, inc = -1;
1007 /* In this case, must reverse order of args
1008 so that we compute and push the last arg first. */
1013 /* I counts args in order (to be) pushed; ARGPOS counts in order written. */
1014 for (p = actparms, argpos = 0; p; p = TREE_CHAIN (p), i += inc, argpos++)
1016 tree type = TREE_TYPE (TREE_VALUE (p));
1018 enum machine_mode mode;
1020 args[i].tree_value = TREE_VALUE (p);
1022 /* Replace erroneous argument with constant zero. */
1023 if (type == error_mark_node || TYPE_SIZE (type) == 0)
1024 args[i].tree_value = integer_zero_node, type = integer_type_node;
1026 /* If TYPE is a transparent union, pass things the way we would
1027 pass the first field of the union. We have already verified that
1028 the modes are the same. */
1029 if (TYPE_TRANSPARENT_UNION (type))
1030 type = TREE_TYPE (TYPE_FIELDS (type));
1032 /* Decide where to pass this arg.
1034 args[i].reg is nonzero if all or part is passed in registers.
1036 args[i].partial is nonzero if part but not all is passed in registers,
1037 and the exact value says how many words are passed in registers.
1039 args[i].pass_on_stack is nonzero if the argument must at least be
1040 computed on the stack. It may then be loaded back into registers
1041 if args[i].reg is nonzero.
1043 These decisions are driven by the FUNCTION_... macros and must agree
1044 with those made by function.c. */
1046 /* See if this argument should be passed by invisible reference. */
1047 if ((TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST
1048 && contains_placeholder_p (TYPE_SIZE (type)))
1049 || TREE_ADDRESSABLE (type)
1050 #ifdef FUNCTION_ARG_PASS_BY_REFERENCE
1051 || FUNCTION_ARG_PASS_BY_REFERENCE (args_so_far, TYPE_MODE (type),
1052 type, argpos < n_named_args)
1056 /* If we're compiling a thunk, pass through invisible
1057 references instead of making a copy. */
1058 if (current_function_is_thunk
1059 #ifdef FUNCTION_ARG_CALLEE_COPIES
1060 || (FUNCTION_ARG_CALLEE_COPIES (args_so_far, TYPE_MODE (type),
1061 type, argpos < n_named_args)
1062 /* If it's in a register, we must make a copy of it too. */
1063 /* ??? Is this a sufficient test? Is there a better one? */
1064 && !(TREE_CODE (args[i].tree_value) == VAR_DECL
1065 && REG_P (DECL_RTL (args[i].tree_value)))
1066 && ! TREE_ADDRESSABLE (type))
1070 args[i].tree_value = build1 (ADDR_EXPR,
1071 build_pointer_type (type),
1072 args[i].tree_value);
1073 type = build_pointer_type (type);
1077 /* We make a copy of the object and pass the address to the
1078 function being called. */
1081 if (TYPE_SIZE (type) == 0
1082 || TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST
1083 || (flag_stack_check && ! STACK_CHECK_BUILTIN
1084 && (TREE_INT_CST_HIGH (TYPE_SIZE (type)) != 0
1085 || (TREE_INT_CST_LOW (TYPE_SIZE (type))
1086 > STACK_CHECK_MAX_VAR_SIZE * BITS_PER_UNIT))))
1088 /* This is a variable-sized object. Make space on the stack
1090 rtx size_rtx = expr_size (TREE_VALUE (p));
1092 if (old_stack_level == 0)
1094 emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX);
1095 old_pending_adj = pending_stack_adjust;
1096 pending_stack_adjust = 0;
1099 copy = gen_rtx_MEM (BLKmode,
1100 allocate_dynamic_stack_space (size_rtx,
1102 TYPE_ALIGN (type)));
1106 int size = int_size_in_bytes (type);
1107 copy = assign_stack_temp (TYPE_MODE (type), size, 0);
1110 MEM_IN_STRUCT_P (copy) = AGGREGATE_TYPE_P (type);
1112 store_expr (args[i].tree_value, copy, 0);
1115 args[i].tree_value = build1 (ADDR_EXPR,
1116 build_pointer_type (type),
1117 make_tree (type, copy));
1118 type = build_pointer_type (type);
1122 mode = TYPE_MODE (type);
1123 unsignedp = TREE_UNSIGNED (type);
1125 #ifdef PROMOTE_FUNCTION_ARGS
1126 mode = promote_mode (type, mode, &unsignedp, 1);
1129 args[i].unsignedp = unsignedp;
1130 args[i].mode = mode;
1131 args[i].reg = FUNCTION_ARG (args_so_far, mode, type,
1132 argpos < n_named_args);
1133 #ifdef FUNCTION_ARG_PARTIAL_NREGS
1136 = FUNCTION_ARG_PARTIAL_NREGS (args_so_far, mode, type,
1137 argpos < n_named_args);
1140 args[i].pass_on_stack = MUST_PASS_IN_STACK (mode, type);
1142 /* If FUNCTION_ARG returned a (parallel [(expr_list (nil) ...) ...]),
1143 it means that we are to pass this arg in the register(s) designated
1144 by the PARALLEL, but also to pass it in the stack. */
1145 if (args[i].reg && GET_CODE (args[i].reg) == PARALLEL
1146 && XEXP (XVECEXP (args[i].reg, 0, 0), 0) == 0)
1147 args[i].pass_on_stack = 1;
1149 /* If this is an addressable type, we must preallocate the stack
1150 since we must evaluate the object into its final location.
1152 If this is to be passed in both registers and the stack, it is simpler
1154 if (TREE_ADDRESSABLE (type)
1155 || (args[i].pass_on_stack && args[i].reg != 0))
1156 must_preallocate = 1;
1158 /* If this is an addressable type, we cannot pre-evaluate it. Thus,
1159 we cannot consider this function call constant. */
1160 if (TREE_ADDRESSABLE (type))
1163 /* Compute the stack-size of this argument. */
1164 if (args[i].reg == 0 || args[i].partial != 0
1165 #ifdef REG_PARM_STACK_SPACE
1166 || reg_parm_stack_space > 0
1168 || args[i].pass_on_stack)
1169 locate_and_pad_parm (mode, type,
1170 #ifdef STACK_PARMS_IN_REG_PARM_AREA
1175 fndecl, &args_size, &args[i].offset,
1178 #ifndef ARGS_GROW_DOWNWARD
1179 args[i].slot_offset = args_size;
1182 #ifndef REG_PARM_STACK_SPACE
1183 /* If a part of the arg was put into registers,
1184 don't include that part in the amount pushed. */
1185 if (! args[i].pass_on_stack)
1186 args[i].size.constant -= ((args[i].partial * UNITS_PER_WORD)
1187 / (PARM_BOUNDARY / BITS_PER_UNIT)
1188 * (PARM_BOUNDARY / BITS_PER_UNIT));
1191 /* Update ARGS_SIZE, the total stack space for args so far. */
1193 args_size.constant += args[i].size.constant;
1194 if (args[i].size.var)
1196 ADD_PARM_SIZE (args_size, args[i].size.var);
1199 /* Since the slot offset points to the bottom of the slot,
1200 we must record it after incrementing if the args grow down. */
1201 #ifdef ARGS_GROW_DOWNWARD
1202 args[i].slot_offset = args_size;
1204 args[i].slot_offset.constant = -args_size.constant;
1207 SUB_PARM_SIZE (args[i].slot_offset, args_size.var);
1211 /* Increment ARGS_SO_FAR, which has info about which arg-registers
1212 have been used, etc. */
1214 FUNCTION_ARG_ADVANCE (args_so_far, TYPE_MODE (type), type,
1215 argpos < n_named_args);
1218 #ifdef FINAL_REG_PARM_STACK_SPACE
1219 reg_parm_stack_space = FINAL_REG_PARM_STACK_SPACE (args_size.constant,
1223 /* Compute the actual size of the argument block required. The variable
1224 and constant sizes must be combined, the size may have to be rounded,
1225 and there may be a minimum required size. */
1227 original_args_size = args_size;
1230 /* If this function requires a variable-sized argument list, don't try to
1231 make a cse'able block for this call. We may be able to do this
1232 eventually, but it is too complicated to keep track of what insns go
1233 in the cse'able block and which don't. */
1236 must_preallocate = 1;
1238 args_size.var = ARGS_SIZE_TREE (args_size);
1239 args_size.constant = 0;
1241 #ifdef STACK_BOUNDARY
1242 if (STACK_BOUNDARY != BITS_PER_UNIT)
1243 args_size.var = round_up (args_size.var, STACK_BYTES);
1246 #ifdef REG_PARM_STACK_SPACE
1247 if (reg_parm_stack_space > 0)
1250 = size_binop (MAX_EXPR, args_size.var,
1251 size_int (REG_PARM_STACK_SPACE (fndecl)));
1253 #ifndef OUTGOING_REG_PARM_STACK_SPACE
1254 /* The area corresponding to register parameters is not to count in
1255 the size of the block we need. So make the adjustment. */
1257 = size_binop (MINUS_EXPR, args_size.var,
1258 size_int (reg_parm_stack_space));
1265 #ifdef STACK_BOUNDARY
1266 args_size.constant = (((args_size.constant + (STACK_BYTES - 1))
1267 / STACK_BYTES) * STACK_BYTES);
1270 #ifdef REG_PARM_STACK_SPACE
1271 args_size.constant = MAX (args_size.constant,
1272 reg_parm_stack_space);
1273 #ifdef MAYBE_REG_PARM_STACK_SPACE
1274 if (reg_parm_stack_space == 0)
1275 args_size.constant = 0;
1277 #ifndef OUTGOING_REG_PARM_STACK_SPACE
1278 args_size.constant -= reg_parm_stack_space;
1283 /* See if we have or want to preallocate stack space.
1285 If we would have to push a partially-in-regs parm
1286 before other stack parms, preallocate stack space instead.
1288 If the size of some parm is not a multiple of the required stack
1289 alignment, we must preallocate.
1291 If the total size of arguments that would otherwise create a copy in
1292 a temporary (such as a CALL) is more than half the total argument list
1293 size, preallocation is faster.
1295 Another reason to preallocate is if we have a machine (like the m88k)
1296 where stack alignment is required to be maintained between every
1297 pair of insns, not just when the call is made. However, we assume here
1298 that such machines either do not have push insns (and hence preallocation
1299 would occur anyway) or the problem is taken care of with
1302 if (! must_preallocate)
1304 int partial_seen = 0;
1305 int copy_to_evaluate_size = 0;
1307 for (i = 0; i < num_actuals && ! must_preallocate; i++)
1309 if (args[i].partial > 0 && ! args[i].pass_on_stack)
1311 else if (partial_seen && args[i].reg == 0)
1312 must_preallocate = 1;
1314 if (TYPE_MODE (TREE_TYPE (args[i].tree_value)) == BLKmode
1315 && (TREE_CODE (args[i].tree_value) == CALL_EXPR
1316 || TREE_CODE (args[i].tree_value) == TARGET_EXPR
1317 || TREE_CODE (args[i].tree_value) == COND_EXPR
1318 || TREE_ADDRESSABLE (TREE_TYPE (args[i].tree_value))))
1319 copy_to_evaluate_size
1320 += int_size_in_bytes (TREE_TYPE (args[i].tree_value));
1323 if (copy_to_evaluate_size * 2 >= args_size.constant
1324 && args_size.constant > 0)
1325 must_preallocate = 1;
1328 /* If the structure value address will reference the stack pointer, we must
1329 stabilize it. We don't need to do this if we know that we are not going
1330 to adjust the stack pointer in processing this call. */
1332 if (structure_value_addr
1333 && (reg_mentioned_p (virtual_stack_dynamic_rtx, structure_value_addr)
1334 || reg_mentioned_p (virtual_outgoing_args_rtx, structure_value_addr))
1336 #ifndef ACCUMULATE_OUTGOING_ARGS
1337 || args_size.constant
1340 structure_value_addr = copy_to_reg (structure_value_addr);
1342 /* If this function call is cse'able, precompute all the parameters.
1343 Note that if the parameter is constructed into a temporary, this will
1344 cause an additional copy because the parameter will be constructed
1345 into a temporary location and then copied into the outgoing arguments.
1346 If a parameter contains a call to alloca and this function uses the
1347 stack, precompute the parameter. */
1349 /* If we preallocated the stack space, and some arguments must be passed
1350 on the stack, then we must precompute any parameter which contains a
1351 function call which will store arguments on the stack.
1352 Otherwise, evaluating the parameter may clobber previous parameters
1353 which have already been stored into the stack. */
1355 for (i = 0; i < num_actuals; i++)
1357 || ((args_size.var != 0 || args_size.constant != 0)
1358 && calls_function (args[i].tree_value, 1))
1359 || (must_preallocate && (args_size.var != 0 || args_size.constant != 0)
1360 && calls_function (args[i].tree_value, 0)))
1362 /* If this is an addressable type, we cannot pre-evaluate it. */
1363 if (TREE_ADDRESSABLE (TREE_TYPE (args[i].tree_value)))
1368 args[i].initial_value = args[i].value
1369 = expand_expr (args[i].tree_value, NULL_RTX, VOIDmode, 0);
1371 preserve_temp_slots (args[i].value);
1374 /* ANSI doesn't require a sequence point here,
1375 but PCC has one, so this will avoid some problems. */
1378 args[i].initial_value = args[i].value
1379 = protect_from_queue (args[i].initial_value, 0);
1381 if (TYPE_MODE (TREE_TYPE (args[i].tree_value)) != args[i].mode)
1383 = convert_modes (args[i].mode,
1384 TYPE_MODE (TREE_TYPE (args[i].tree_value)),
1385 args[i].value, args[i].unsignedp);
1388 /* Now we are about to start emitting insns that can be deleted
1389 if a libcall is deleted. */
1390 if (is_const || is_malloc)
1393 /* If we have no actual push instructions, or shouldn't use them,
1394 make space for all args right now. */
1396 if (args_size.var != 0)
1398 if (old_stack_level == 0)
1400 emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX);
1401 old_pending_adj = pending_stack_adjust;
1402 pending_stack_adjust = 0;
1403 #ifdef ACCUMULATE_OUTGOING_ARGS
1404 /* stack_arg_under_construction says whether a stack arg is
1405 being constructed at the old stack level. Pushing the stack
1406 gets a clean outgoing argument block. */
1407 old_stack_arg_under_construction = stack_arg_under_construction;
1408 stack_arg_under_construction = 0;
1411 argblock = push_block (ARGS_SIZE_RTX (args_size), 0, 0);
1415 /* Note that we must go through the motions of allocating an argument
1416 block even if the size is zero because we may be storing args
1417 in the area reserved for register arguments, which may be part of
1420 int needed = args_size.constant;
1422 /* Store the maximum argument space used. It will be pushed by
1423 the prologue (if ACCUMULATE_OUTGOING_ARGS, or stack overflow
1426 if (needed > current_function_outgoing_args_size)
1427 current_function_outgoing_args_size = needed;
1429 if (must_preallocate)
1431 #ifdef ACCUMULATE_OUTGOING_ARGS
1432 /* Since the stack pointer will never be pushed, it is possible for
1433 the evaluation of a parm to clobber something we have already
1434 written to the stack. Since most function calls on RISC machines
1435 do not use the stack, this is uncommon, but must work correctly.
1437 Therefore, we save any area of the stack that was already written
1438 and that we are using. Here we set up to do this by making a new
1439 stack usage map from the old one. The actual save will be done
1442 Another approach might be to try to reorder the argument
1443 evaluations to avoid this conflicting stack usage. */
1445 #if defined(REG_PARM_STACK_SPACE) && ! defined(OUTGOING_REG_PARM_STACK_SPACE)
1446 /* Since we will be writing into the entire argument area, the
1447 map must be allocated for its entire size, not just the part that
1448 is the responsibility of the caller. */
1449 needed += reg_parm_stack_space;
1452 #ifdef ARGS_GROW_DOWNWARD
1453 highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use,
1456 highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use,
1459 stack_usage_map = (char *) alloca (highest_outgoing_arg_in_use);
1461 if (initial_highest_arg_in_use)
1462 bcopy (initial_stack_usage_map, stack_usage_map,
1463 initial_highest_arg_in_use);
1465 if (initial_highest_arg_in_use != highest_outgoing_arg_in_use)
1466 bzero (&stack_usage_map[initial_highest_arg_in_use],
1467 highest_outgoing_arg_in_use - initial_highest_arg_in_use);
1470 /* The address of the outgoing argument list must not be copied to a
1471 register here, because argblock would be left pointing to the
1472 wrong place after the call to allocate_dynamic_stack_space below.
1475 argblock = virtual_outgoing_args_rtx;
1477 #else /* not ACCUMULATE_OUTGOING_ARGS */
1478 if (inhibit_defer_pop == 0)
1480 /* Try to reuse some or all of the pending_stack_adjust
1481 to get this space. Maybe we can avoid any pushing. */
1482 if (needed > pending_stack_adjust)
1484 needed -= pending_stack_adjust;
1485 pending_stack_adjust = 0;
1489 pending_stack_adjust -= needed;
1493 /* Special case this because overhead of `push_block' in this
1494 case is non-trivial. */
1496 argblock = virtual_outgoing_args_rtx;
1498 argblock = push_block (GEN_INT (needed), 0, 0);
1500 /* We only really need to call `copy_to_reg' in the case where push
1501 insns are going to be used to pass ARGBLOCK to a function
1502 call in ARGS. In that case, the stack pointer changes value
1503 from the allocation point to the call point, and hence
1504 the value of VIRTUAL_OUTGOING_ARGS_RTX changes as well.
1505 But might as well always do it. */
1506 argblock = copy_to_reg (argblock);
1507 #endif /* not ACCUMULATE_OUTGOING_ARGS */
1511 #ifdef ACCUMULATE_OUTGOING_ARGS
1512 /* The save/restore code in store_one_arg handles all cases except one:
1513 a constructor call (including a C function returning a BLKmode struct)
1514 to initialize an argument. */
1515 if (stack_arg_under_construction)
1517 #if defined(REG_PARM_STACK_SPACE) && ! defined(OUTGOING_REG_PARM_STACK_SPACE)
1518 rtx push_size = GEN_INT (reg_parm_stack_space + args_size.constant);
1520 rtx push_size = GEN_INT (args_size.constant);
1522 if (old_stack_level == 0)
1524 emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX);
1525 old_pending_adj = pending_stack_adjust;
1526 pending_stack_adjust = 0;
1527 /* stack_arg_under_construction says whether a stack arg is
1528 being constructed at the old stack level. Pushing the stack
1529 gets a clean outgoing argument block. */
1530 old_stack_arg_under_construction = stack_arg_under_construction;
1531 stack_arg_under_construction = 0;
1532 /* Make a new map for the new argument list. */
1533 stack_usage_map = (char *)alloca (highest_outgoing_arg_in_use);
1534 bzero (stack_usage_map, highest_outgoing_arg_in_use);
1535 highest_outgoing_arg_in_use = 0;
1537 allocate_dynamic_stack_space (push_size, NULL_RTX, BITS_PER_UNIT);
1539 /* If argument evaluation might modify the stack pointer, copy the
1540 address of the argument list to a register. */
1541 for (i = 0; i < num_actuals; i++)
1542 if (args[i].pass_on_stack)
1544 argblock = copy_addr_to_reg (argblock);
1550 /* If we preallocated stack space, compute the address of each argument.
1551 We need not ensure it is a valid memory address here; it will be
1552 validized when it is used. */
1555 rtx arg_reg = argblock;
1558 if (GET_CODE (argblock) == PLUS)
1559 arg_reg = XEXP (argblock, 0), arg_offset = INTVAL (XEXP (argblock, 1));
1561 for (i = 0; i < num_actuals; i++)
1563 rtx offset = ARGS_SIZE_RTX (args[i].offset);
1564 rtx slot_offset = ARGS_SIZE_RTX (args[i].slot_offset);
1567 /* Skip this parm if it will not be passed on the stack. */
1568 if (! args[i].pass_on_stack && args[i].reg != 0)
1571 if (GET_CODE (offset) == CONST_INT)
1572 addr = plus_constant (arg_reg, INTVAL (offset));
1574 addr = gen_rtx_PLUS (Pmode, arg_reg, offset);
1576 addr = plus_constant (addr, arg_offset);
1577 args[i].stack = gen_rtx_MEM (args[i].mode, addr);
1578 MEM_IN_STRUCT_P (args[i].stack)
1579 = AGGREGATE_TYPE_P (TREE_TYPE (args[i].tree_value));
1581 if (GET_CODE (slot_offset) == CONST_INT)
1582 addr = plus_constant (arg_reg, INTVAL (slot_offset));
1584 addr = gen_rtx_PLUS (Pmode, arg_reg, slot_offset);
1586 addr = plus_constant (addr, arg_offset);
1587 args[i].stack_slot = gen_rtx_MEM (args[i].mode, addr);
1591 #ifdef PUSH_ARGS_REVERSED
1592 #ifdef STACK_BOUNDARY
1593 /* If we push args individually in reverse order, perform stack alignment
1594 before the first push (the last arg). */
1596 anti_adjust_stack (GEN_INT (args_size.constant
1597 - original_args_size.constant));
1601 /* Don't try to defer pops if preallocating, not even from the first arg,
1602 since ARGBLOCK probably refers to the SP. */
1606 /* Get the function to call, in the form of RTL. */
1609 /* If this is the first use of the function, see if we need to
1610 make an external definition for it. */
1611 if (! TREE_USED (fndecl))
1613 assemble_external (fndecl);
1614 TREE_USED (fndecl) = 1;
1617 /* Get a SYMBOL_REF rtx for the function address. */
1618 funexp = XEXP (DECL_RTL (fndecl), 0);
1621 /* Generate an rtx (probably a pseudo-register) for the address. */
1624 funexp = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, VOIDmode, 0);
1625 pop_temp_slots (); /* FUNEXP can't be BLKmode */
1627 /* Check the function is executable. */
1628 if (flag_check_memory_usage)
1629 emit_library_call (chkr_check_exec_libfunc, 1,
1635 /* Figure out the register where the value, if any, will come back. */
1637 if (TYPE_MODE (TREE_TYPE (exp)) != VOIDmode
1638 && ! structure_value_addr)
1640 if (pcc_struct_value)
1641 valreg = hard_function_value (build_pointer_type (TREE_TYPE (exp)),
1644 valreg = hard_function_value (TREE_TYPE (exp), fndecl);
1647 /* Precompute all register parameters. It isn't safe to compute anything
1648 once we have started filling any specific hard regs. */
1650 for (i = 0; i < num_actuals; i++)
1651 if (args[i].reg != 0 && ! args[i].pass_on_stack)
1655 if (args[i].value == 0)
1658 args[i].value = expand_expr (args[i].tree_value, NULL_RTX,
1660 preserve_temp_slots (args[i].value);
1663 /* ANSI doesn't require a sequence point here,
1664 but PCC has one, so this will avoid some problems. */
1668 /* If we are to promote the function arg to a wider mode,
1671 if (args[i].mode != TYPE_MODE (TREE_TYPE (args[i].tree_value)))
1673 = convert_modes (args[i].mode,
1674 TYPE_MODE (TREE_TYPE (args[i].tree_value)),
1675 args[i].value, args[i].unsignedp);
1677 /* If the value is expensive, and we are inside an appropriately
1678 short loop, put the value into a pseudo and then put the pseudo
1681 For small register classes, also do this if this call uses
1682 register parameters. This is to avoid reload conflicts while
1683 loading the parameters registers. */
1685 if ((! (GET_CODE (args[i].value) == REG
1686 || (GET_CODE (args[i].value) == SUBREG
1687 && GET_CODE (SUBREG_REG (args[i].value)) == REG)))
1688 && args[i].mode != BLKmode
1689 && rtx_cost (args[i].value, SET) > 2
1690 && ((SMALL_REGISTER_CLASSES && reg_parm_seen)
1691 || preserve_subexpressions_p ()))
1692 args[i].value = copy_to_mode_reg (args[i].mode, args[i].value);
1695 #if defined(ACCUMULATE_OUTGOING_ARGS) && defined(REG_PARM_STACK_SPACE)
1696 /* The argument list is the property of the called routine and it
1697 may clobber it. If the fixed area has been used for previous
1698 parameters, we must save and restore it.
1700 Here we compute the boundary of the that needs to be saved, if any. */
1702 #ifdef ARGS_GROW_DOWNWARD
1703 for (i = 0; i < reg_parm_stack_space + 1; i++)
1705 for (i = 0; i < reg_parm_stack_space; i++)
1708 if (i >= highest_outgoing_arg_in_use
1709 || stack_usage_map[i] == 0)
1712 if (low_to_save == -1)
1718 if (low_to_save >= 0)
1720 int num_to_save = high_to_save - low_to_save + 1;
1721 enum machine_mode save_mode
1722 = mode_for_size (num_to_save * BITS_PER_UNIT, MODE_INT, 1);
1725 /* If we don't have the required alignment, must do this in BLKmode. */
1726 if ((low_to_save & (MIN (GET_MODE_SIZE (save_mode),
1727 BIGGEST_ALIGNMENT / UNITS_PER_WORD) - 1)))
1728 save_mode = BLKmode;
1730 #ifdef ARGS_GROW_DOWNWARD
1731 stack_area = gen_rtx_MEM (save_mode,
1732 memory_address (save_mode,
1733 plus_constant (argblock,
1736 stack_area = gen_rtx_MEM (save_mode,
1737 memory_address (save_mode,
1738 plus_constant (argblock,
1741 if (save_mode == BLKmode)
1743 save_area = assign_stack_temp (BLKmode, num_to_save, 0);
1744 MEM_IN_STRUCT_P (save_area) = 0;
1745 emit_block_move (validize_mem (save_area), stack_area,
1746 GEN_INT (num_to_save),
1747 PARM_BOUNDARY / BITS_PER_UNIT);
1751 save_area = gen_reg_rtx (save_mode);
1752 emit_move_insn (save_area, stack_area);
1758 /* Now store (and compute if necessary) all non-register parms.
1759 These come before register parms, since they can require block-moves,
1760 which could clobber the registers used for register parms.
1761 Parms which have partial registers are not stored here,
1762 but we do preallocate space here if they want that. */
1764 for (i = 0; i < num_actuals; i++)
1765 if (args[i].reg == 0 || args[i].pass_on_stack)
1766 store_one_arg (&args[i], argblock, may_be_alloca,
1767 args_size.var != 0, fndecl, reg_parm_stack_space);
1769 /* If we have a parm that is passed in registers but not in memory
1770 and whose alignment does not permit a direct copy into registers,
1771 make a group of pseudos that correspond to each register that we
1774 if (STRICT_ALIGNMENT)
1775 for (i = 0; i < num_actuals; i++)
1776 if (args[i].reg != 0 && ! args[i].pass_on_stack
1777 && args[i].mode == BLKmode
1778 && (TYPE_ALIGN (TREE_TYPE (args[i].tree_value))
1779 < MIN (BIGGEST_ALIGNMENT, BITS_PER_WORD)))
1781 int bytes = int_size_in_bytes (TREE_TYPE (args[i].tree_value));
1782 int big_endian_correction = 0;
1784 args[i].n_aligned_regs
1785 = args[i].partial ? args[i].partial
1786 : (bytes + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD;
1788 args[i].aligned_regs = (rtx *) alloca (sizeof (rtx)
1789 * args[i].n_aligned_regs);
1791 /* Structures smaller than a word are aligned to the least
1792 significant byte (to the right). On a BYTES_BIG_ENDIAN machine,
1793 this means we must skip the empty high order bytes when
1794 calculating the bit offset. */
1795 if (BYTES_BIG_ENDIAN && bytes < UNITS_PER_WORD)
1796 big_endian_correction = (BITS_PER_WORD - (bytes * BITS_PER_UNIT));
1798 for (j = 0; j < args[i].n_aligned_regs; j++)
1800 rtx reg = gen_reg_rtx (word_mode);
1801 rtx word = operand_subword_force (args[i].value, j, BLKmode);
1802 int bitsize = TYPE_ALIGN (TREE_TYPE (args[i].tree_value));
1805 args[i].aligned_regs[j] = reg;
1807 /* Clobber REG and move each partword into it. Ensure we don't
1808 go past the end of the structure. Note that the loop below
1809 works because we've already verified that padding
1810 and endianness are compatible.
1812 We use to emit a clobber here but that doesn't let later
1813 passes optimize the instructions we emit. By storing 0 into
1814 the register later passes know the first AND to zero out the
1815 bitfield being set in the register is unnecessary. The store
1816 of 0 will be deleted as will at least the first AND. */
1818 emit_move_insn (reg, const0_rtx);
1821 bitpos < BITS_PER_WORD && bytes > 0;
1822 bitpos += bitsize, bytes -= bitsize / BITS_PER_UNIT)
1824 int xbitpos = bitpos + big_endian_correction;
1826 store_bit_field (reg, bitsize, xbitpos, word_mode,
1827 extract_bit_field (word, bitsize, bitpos, 1,
1828 NULL_RTX, word_mode,
1830 bitsize / BITS_PER_UNIT,
1832 bitsize / BITS_PER_UNIT, BITS_PER_WORD);
1837 /* Now store any partially-in-registers parm.
1838 This is the last place a block-move can happen. */
1840 for (i = 0; i < num_actuals; i++)
1841 if (args[i].partial != 0 && ! args[i].pass_on_stack)
1842 store_one_arg (&args[i], argblock, may_be_alloca,
1843 args_size.var != 0, fndecl, reg_parm_stack_space);
1845 #ifndef PUSH_ARGS_REVERSED
1846 #ifdef STACK_BOUNDARY
1847 /* If we pushed args in forward order, perform stack alignment
1848 after pushing the last arg. */
1850 anti_adjust_stack (GEN_INT (args_size.constant
1851 - original_args_size.constant));
1855 /* If register arguments require space on the stack and stack space
1856 was not preallocated, allocate stack space here for arguments
1857 passed in registers. */
1858 #if ! defined(ACCUMULATE_OUTGOING_ARGS) && defined(OUTGOING_REG_PARM_STACK_SPACE)
1859 if (must_preallocate == 0 && reg_parm_stack_space > 0)
1860 anti_adjust_stack (GEN_INT (reg_parm_stack_space));
1863 /* Pass the function the address in which to return a structure value. */
1864 if (structure_value_addr && ! structure_value_addr_parm)
1866 emit_move_insn (struct_value_rtx,
1868 force_operand (structure_value_addr,
1871 /* Mark the memory for the aggregate as write-only. */
1872 if (flag_check_memory_usage)
1873 emit_library_call (chkr_set_right_libfunc, 1,
1875 structure_value_addr, ptr_mode,
1876 GEN_INT (struct_value_size), TYPE_MODE (sizetype),
1877 GEN_INT (MEMORY_USE_WO),
1878 TYPE_MODE (integer_type_node));
1880 if (GET_CODE (struct_value_rtx) == REG)
1881 use_reg (&call_fusage, struct_value_rtx);
1884 funexp = prepare_call_address (funexp, fndecl, &call_fusage, reg_parm_seen);
1886 /* Now do the register loads required for any wholly-register parms or any
1887 parms which are passed both on the stack and in a register. Their
1888 expressions were already evaluated.
1890 Mark all register-parms as living through the call, putting these USE
1891 insns in the CALL_INSN_FUNCTION_USAGE field. */
1893 #ifdef LOAD_ARGS_REVERSED
1894 for (i = num_actuals - 1; i >= 0; i--)
1896 for (i = 0; i < num_actuals; i++)
1899 rtx reg = args[i].reg;
1900 int partial = args[i].partial;
1905 /* Set to non-negative if must move a word at a time, even if just
1906 one word (e.g, partial == 1 && mode == DFmode). Set to -1 if
1907 we just use a normal move insn. This value can be zero if the
1908 argument is a zero size structure with no fields. */
1909 nregs = (partial ? partial
1910 : (TYPE_MODE (TREE_TYPE (args[i].tree_value)) == BLKmode
1911 ? ((int_size_in_bytes (TREE_TYPE (args[i].tree_value))
1912 + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD)
1915 /* Handle calls that pass values in multiple non-contiguous
1916 locations. The Irix 6 ABI has examples of this. */
1918 if (GET_CODE (reg) == PARALLEL)
1919 emit_group_load (reg, args[i].value);
1921 /* If simple case, just do move. If normal partial, store_one_arg
1922 has already loaded the register for us. In all other cases,
1923 load the register(s) from memory. */
1925 else if (nregs == -1)
1926 emit_move_insn (reg, args[i].value);
1928 /* If we have pre-computed the values to put in the registers in
1929 the case of non-aligned structures, copy them in now. */
1931 else if (args[i].n_aligned_regs != 0)
1932 for (j = 0; j < args[i].n_aligned_regs; j++)
1933 emit_move_insn (gen_rtx_REG (word_mode, REGNO (reg) + j),
1934 args[i].aligned_regs[j]);
1936 else if (partial == 0 || args[i].pass_on_stack)
1937 move_block_to_reg (REGNO (reg),
1938 validize_mem (args[i].value), nregs,
1941 /* Handle calls that pass values in multiple non-contiguous
1942 locations. The Irix 6 ABI has examples of this. */
1943 if (GET_CODE (reg) == PARALLEL)
1944 use_group_regs (&call_fusage, reg);
1945 else if (nregs == -1)
1946 use_reg (&call_fusage, reg);
1948 use_regs (&call_fusage, REGNO (reg), nregs == 0 ? 1 : nregs);
1952 /* Perform postincrements before actually calling the function. */
1955 /* All arguments and registers used for the call must be set up by now! */
1957 /* Generate the actual call instruction. */
1958 emit_call_1 (funexp, fndecl, funtype, args_size.constant, struct_value_size,
1959 FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1),
1960 valreg, old_inhibit_defer_pop, call_fusage, is_const);
1962 /* If call is cse'able, make appropriate pair of reg-notes around it.
1963 Test valreg so we don't crash; may safely ignore `const'
1964 if return type is void. Disable for PARALLEL return values, because
1965 we have no way to move such values into a pseudo register. */
1966 if (is_const && valreg != 0 && GET_CODE (valreg) != PARALLEL)
1969 rtx temp = gen_reg_rtx (GET_MODE (valreg));
1972 /* Mark the return value as a pointer if needed. */
1973 if (TREE_CODE (TREE_TYPE (exp)) == POINTER_TYPE)
1975 tree pointed_to = TREE_TYPE (TREE_TYPE (exp));
1976 mark_reg_pointer (temp, TYPE_ALIGN (pointed_to) / BITS_PER_UNIT);
1979 /* Construct an "equal form" for the value which mentions all the
1980 arguments in order as well as the function name. */
1981 #ifdef PUSH_ARGS_REVERSED
1982 for (i = 0; i < num_actuals; i++)
1983 note = gen_rtx_EXPR_LIST (VOIDmode, args[i].initial_value, note);
1985 for (i = num_actuals - 1; i >= 0; i--)
1986 note = gen_rtx_EXPR_LIST (VOIDmode, args[i].initial_value, note);
1988 note = gen_rtx_EXPR_LIST (VOIDmode, funexp, note);
1990 insns = get_insns ();
1993 emit_libcall_block (insns, temp, valreg, note);
1999 /* Otherwise, just write out the sequence without a note. */
2000 rtx insns = get_insns ();
2007 rtx temp = gen_reg_rtx (GET_MODE (valreg));
2010 /* The return value from a malloc-like function is a pointer. */
2011 if (TREE_CODE (TREE_TYPE (exp)) == POINTER_TYPE)
2012 mark_reg_pointer (temp, BIGGEST_ALIGNMENT / BITS_PER_UNIT);
2014 emit_move_insn (temp, valreg);
2016 /* The return value from a malloc-like function can not alias
2018 last = get_last_insn ();
2020 gen_rtx_EXPR_LIST (REG_NOALIAS, temp, REG_NOTES (last));
2022 /* Write out the sequence. */
2023 insns = get_insns ();
2029 /* For calls to `setjmp', etc., inform flow.c it should complain
2030 if nonvolatile values are live. */
2034 emit_note (name, NOTE_INSN_SETJMP);
2035 current_function_calls_setjmp = 1;
2039 current_function_calls_longjmp = 1;
2041 /* Notice functions that cannot return.
2042 If optimizing, insns emitted below will be dead.
2043 If not optimizing, they will exist, which is useful
2044 if the user uses the `return' command in the debugger. */
2046 if (is_volatile || is_longjmp)
2049 /* If value type not void, return an rtx for the value. */
2051 /* If there are cleanups to be called, don't use a hard reg as target.
2052 We need to double check this and see if it matters anymore. */
2053 if (any_pending_cleanups (1)
2054 && target && REG_P (target)
2055 && REGNO (target) < FIRST_PSEUDO_REGISTER)
2058 if (TYPE_MODE (TREE_TYPE (exp)) == VOIDmode
2061 target = const0_rtx;
2063 else if (structure_value_addr)
2065 if (target == 0 || GET_CODE (target) != MEM)
2067 target = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp)),
2068 memory_address (TYPE_MODE (TREE_TYPE (exp)),
2069 structure_value_addr));
2070 MEM_IN_STRUCT_P (target) = AGGREGATE_TYPE_P (TREE_TYPE (exp));
2073 else if (pcc_struct_value)
2075 /* This is the special C++ case where we need to
2076 know what the true target was. We take care to
2077 never use this value more than once in one expression. */
2078 target = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp)),
2079 copy_to_reg (valreg));
2080 MEM_IN_STRUCT_P (target) = AGGREGATE_TYPE_P (TREE_TYPE (exp));
2082 /* Handle calls that return values in multiple non-contiguous locations.
2083 The Irix 6 ABI has examples of this. */
2084 else if (GET_CODE (valreg) == PARALLEL)
2088 int bytes = int_size_in_bytes (TREE_TYPE (exp));
2089 target = assign_stack_temp (TYPE_MODE (TREE_TYPE (exp)), bytes, 0);
2090 MEM_IN_STRUCT_P (target) = AGGREGATE_TYPE_P (TREE_TYPE (exp));
2091 preserve_temp_slots (target);
2094 emit_group_store (target, valreg);
2096 else if (target && GET_MODE (target) == TYPE_MODE (TREE_TYPE (exp))
2097 && GET_MODE (target) == GET_MODE (valreg))
2098 /* TARGET and VALREG cannot be equal at this point because the latter
2099 would not have REG_FUNCTION_VALUE_P true, while the former would if
2100 it were referring to the same register.
2102 If they refer to the same register, this move will be a no-op, except
2103 when function inlining is being done. */
2104 emit_move_insn (target, valreg);
2105 else if (TYPE_MODE (TREE_TYPE (exp)) == BLKmode)
2107 /* Some machines (the PA for example) want to return all small
2108 structures in registers regardless of the structure's alignment.
2110 Deal with them explicitly by copying from the return registers
2111 into the target MEM locations. */
2112 int bytes = int_size_in_bytes (TREE_TYPE (exp));
2114 int bitsize = MIN (TYPE_ALIGN (TREE_TYPE (exp)), BITS_PER_WORD);
2115 int bitpos, xbitpos, big_endian_correction = 0;
2119 target = assign_stack_temp (BLKmode, bytes, 0);
2120 MEM_IN_STRUCT_P (target) = AGGREGATE_TYPE_P (TREE_TYPE (exp));
2121 preserve_temp_slots (target);
2124 /* This code assumes valreg is at least a full word. If it isn't,
2125 copy it into a new pseudo which is a full word. */
2126 if (GET_MODE (valreg) != BLKmode
2127 && GET_MODE_SIZE (GET_MODE (valreg)) < UNITS_PER_WORD)
2128 valreg = convert_to_mode (word_mode, valreg,
2129 TREE_UNSIGNED (TREE_TYPE (exp)));
2131 /* Structures whose size is not a multiple of a word are aligned
2132 to the least significant byte (to the right). On a BYTES_BIG_ENDIAN
2133 machine, this means we must skip the empty high order bytes when
2134 calculating the bit offset. */
2135 if (BYTES_BIG_ENDIAN && bytes % UNITS_PER_WORD)
2136 big_endian_correction = (BITS_PER_WORD - ((bytes % UNITS_PER_WORD)
2139 /* Copy the structure BITSIZE bites at a time.
2141 We could probably emit more efficient code for machines
2142 which do not use strict alignment, but it doesn't seem
2143 worth the effort at the current time. */
2144 for (bitpos = 0, xbitpos = big_endian_correction;
2145 bitpos < bytes * BITS_PER_UNIT;
2146 bitpos += bitsize, xbitpos += bitsize)
2149 /* We need a new source operand each time xbitpos is on a
2150 word boundary and when xbitpos == big_endian_correction
2151 (the first time through). */
2152 if (xbitpos % BITS_PER_WORD == 0
2153 || xbitpos == big_endian_correction)
2154 src = operand_subword_force (valreg,
2155 xbitpos / BITS_PER_WORD,
2158 /* We need a new destination operand each time bitpos is on
2160 if (bitpos % BITS_PER_WORD == 0)
2161 dst = operand_subword (target, bitpos / BITS_PER_WORD, 1, BLKmode);
2163 /* Use xbitpos for the source extraction (right justified) and
2164 xbitpos for the destination store (left justified). */
2165 store_bit_field (dst, bitsize, bitpos % BITS_PER_WORD, word_mode,
2166 extract_bit_field (src, bitsize,
2167 xbitpos % BITS_PER_WORD, 1,
2168 NULL_RTX, word_mode,
2170 bitsize / BITS_PER_UNIT,
2172 bitsize / BITS_PER_UNIT, BITS_PER_WORD);
2176 target = copy_to_reg (valreg);
2178 #ifdef PROMOTE_FUNCTION_RETURN
2179 /* If we promoted this return value, make the proper SUBREG. TARGET
2180 might be const0_rtx here, so be careful. */
2181 if (GET_CODE (target) == REG
2182 && TYPE_MODE (TREE_TYPE (exp)) != BLKmode
2183 && GET_MODE (target) != TYPE_MODE (TREE_TYPE (exp)))
2185 tree type = TREE_TYPE (exp);
2186 int unsignedp = TREE_UNSIGNED (type);
2188 /* If we don't promote as expected, something is wrong. */
2189 if (GET_MODE (target)
2190 != promote_mode (type, TYPE_MODE (type), &unsignedp, 1))
2193 target = gen_rtx_SUBREG (TYPE_MODE (type), target, 0);
2194 SUBREG_PROMOTED_VAR_P (target) = 1;
2195 SUBREG_PROMOTED_UNSIGNED_P (target) = unsignedp;
2199 /* If size of args is variable or this was a constructor call for a stack
2200 argument, restore saved stack-pointer value. */
2202 if (old_stack_level)
2204 emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX);
2205 pending_stack_adjust = old_pending_adj;
2206 #ifdef ACCUMULATE_OUTGOING_ARGS
2207 stack_arg_under_construction = old_stack_arg_under_construction;
2208 highest_outgoing_arg_in_use = initial_highest_arg_in_use;
2209 stack_usage_map = initial_stack_usage_map;
2212 #ifdef ACCUMULATE_OUTGOING_ARGS
2215 #ifdef REG_PARM_STACK_SPACE
2218 enum machine_mode save_mode = GET_MODE (save_area);
2219 #ifdef ARGS_GROW_DOWNWARD
2221 = gen_rtx_MEM (save_mode,
2222 memory_address (save_mode,
2223 plus_constant (argblock,
2227 = gen_rtx_MEM (save_mode,
2228 memory_address (save_mode,
2229 plus_constant (argblock,
2233 if (save_mode != BLKmode)
2234 emit_move_insn (stack_area, save_area);
2236 emit_block_move (stack_area, validize_mem (save_area),
2237 GEN_INT (high_to_save - low_to_save + 1),
2238 PARM_BOUNDARY / BITS_PER_UNIT);
2242 /* If we saved any argument areas, restore them. */
2243 for (i = 0; i < num_actuals; i++)
2244 if (args[i].save_area)
2246 enum machine_mode save_mode = GET_MODE (args[i].save_area);
2248 = gen_rtx_MEM (save_mode,
2249 memory_address (save_mode,
2250 XEXP (args[i].stack_slot, 0)));
2252 if (save_mode != BLKmode)
2253 emit_move_insn (stack_area, args[i].save_area);
2255 emit_block_move (stack_area, validize_mem (args[i].save_area),
2256 GEN_INT (args[i].size.constant),
2257 PARM_BOUNDARY / BITS_PER_UNIT);
2260 highest_outgoing_arg_in_use = initial_highest_arg_in_use;
2261 stack_usage_map = initial_stack_usage_map;
2265 /* If this was alloca, record the new stack level for nonlocal gotos.
2266 Check for the handler slots since we might not have a save area
2267 for non-local gotos. */
2269 if (may_be_alloca && nonlocal_goto_handler_slot != 0)
2270 emit_stack_save (SAVE_NONLOCAL, &nonlocal_goto_stack_level, NULL_RTX);
2277 /* Output a library call to function FUN (a SYMBOL_REF rtx)
2278 (emitting the queue unless NO_QUEUE is nonzero),
2279 for a value of mode OUTMODE,
2280 with NARGS different arguments, passed as alternating rtx values
2281 and machine_modes to convert them to.
2282 The rtx values should have been passed through protect_from_queue already.
2284 NO_QUEUE will be true if and only if the library call is a `const' call
2285 which will be enclosed in REG_LIBCALL/REG_RETVAL notes; it is equivalent
2286 to the variable is_const in expand_call.
2288 NO_QUEUE must be true for const calls, because if it isn't, then
2289 any pending increment will be emitted between REG_LIBCALL/REG_RETVAL notes,
2290 and will be lost if the libcall sequence is optimized away.
2292 NO_QUEUE must be false for non-const calls, because if it isn't, the
2293 call insn will have its CONST_CALL_P bit set, and it will be incorrectly
2294 optimized. For instance, the instruction scheduler may incorrectly
2295 move memory references across the non-const call. */
2298 emit_library_call VPROTO((rtx orgfun, int no_queue, enum machine_mode outmode,
2304 enum machine_mode outmode;
2308 /* Total size in bytes of all the stack-parms scanned so far. */
2309 struct args_size args_size;
2310 /* Size of arguments before any adjustments (such as rounding). */
2311 struct args_size original_args_size;
2312 register int argnum;
2317 CUMULATIVE_ARGS args_so_far;
2318 struct arg { rtx value; enum machine_mode mode; rtx reg; int partial;
2319 struct args_size offset; struct args_size size; rtx save_area; };
2321 int old_inhibit_defer_pop = inhibit_defer_pop;
2322 rtx call_fusage = 0;
2323 #if defined(ACCUMULATE_OUTGOING_ARGS) && defined(REG_PARM_STACK_SPACE)
2324 /* Define the boundary of the register parm stack space that needs to be
2326 int low_to_save = -1, high_to_save;
2327 rtx save_area = 0; /* Place that it is saved */
2330 #ifdef ACCUMULATE_OUTGOING_ARGS
2331 int initial_highest_arg_in_use = highest_outgoing_arg_in_use;
2332 char *initial_stack_usage_map = stack_usage_map;
2336 #ifdef REG_PARM_STACK_SPACE
2337 /* Size of the stack reserved for parameter registers. */
2338 int reg_parm_stack_space = 0;
2339 #ifdef MAYBE_REG_PARM_STACK_SPACE
2340 reg_parm_stack_space = MAYBE_REG_PARM_STACK_SPACE;
2342 reg_parm_stack_space = REG_PARM_STACK_SPACE (fndecl);
2346 VA_START (p, nargs);
2349 orgfun = va_arg (p, rtx);
2350 no_queue = va_arg (p, int);
2351 outmode = va_arg (p, enum machine_mode);
2352 nargs = va_arg (p, int);
2357 /* Copy all the libcall-arguments out of the varargs data
2358 and into a vector ARGVEC.
2360 Compute how to pass each argument. We only support a very small subset
2361 of the full argument passing conventions to limit complexity here since
2362 library functions shouldn't have many args. */
2364 argvec = (struct arg *) alloca (nargs * sizeof (struct arg));
2365 bzero ((char *) argvec, nargs * sizeof (struct arg));
2368 INIT_CUMULATIVE_ARGS (args_so_far, NULL_TREE, fun, 0);
2370 args_size.constant = 0;
2375 for (count = 0; count < nargs; count++)
2377 rtx val = va_arg (p, rtx);
2378 enum machine_mode mode = va_arg (p, enum machine_mode);
2380 /* We cannot convert the arg value to the mode the library wants here;
2381 must do it earlier where we know the signedness of the arg. */
2383 || (GET_MODE (val) != mode && GET_MODE (val) != VOIDmode))
2386 /* On some machines, there's no way to pass a float to a library fcn.
2387 Pass it as a double instead. */
2388 #ifdef LIBGCC_NEEDS_DOUBLE
2389 if (LIBGCC_NEEDS_DOUBLE && mode == SFmode)
2390 val = convert_modes (DFmode, SFmode, val, 0), mode = DFmode;
2393 /* There's no need to call protect_from_queue, because
2394 either emit_move_insn or emit_push_insn will do that. */
2396 /* Make sure it is a reasonable operand for a move or push insn. */
2397 if (GET_CODE (val) != REG && GET_CODE (val) != MEM
2398 && ! (CONSTANT_P (val) && LEGITIMATE_CONSTANT_P (val)))
2399 val = force_operand (val, NULL_RTX);
2401 #ifdef FUNCTION_ARG_PASS_BY_REFERENCE
2402 if (FUNCTION_ARG_PASS_BY_REFERENCE (args_so_far, mode, NULL_TREE, 1))
2404 /* We do not support FUNCTION_ARG_CALLEE_COPIES here since it can
2405 be viewed as just an efficiency improvement. */
2406 rtx slot = assign_stack_temp (mode, GET_MODE_SIZE (mode), 0);
2407 emit_move_insn (slot, val);
2408 val = force_operand (XEXP (slot, 0), NULL_RTX);
2413 argvec[count].value = val;
2414 argvec[count].mode = mode;
2416 argvec[count].reg = FUNCTION_ARG (args_so_far, mode, NULL_TREE, 1);
2417 if (argvec[count].reg && GET_CODE (argvec[count].reg) == PARALLEL)
2419 #ifdef FUNCTION_ARG_PARTIAL_NREGS
2420 argvec[count].partial
2421 = FUNCTION_ARG_PARTIAL_NREGS (args_so_far, mode, NULL_TREE, 1);
2423 argvec[count].partial = 0;
2426 locate_and_pad_parm (mode, NULL_TREE,
2427 argvec[count].reg && argvec[count].partial == 0,
2428 NULL_TREE, &args_size, &argvec[count].offset,
2429 &argvec[count].size);
2431 if (argvec[count].size.var)
2434 #ifndef REG_PARM_STACK_SPACE
2435 if (argvec[count].partial)
2436 argvec[count].size.constant -= argvec[count].partial * UNITS_PER_WORD;
2439 if (argvec[count].reg == 0 || argvec[count].partial != 0
2440 #ifdef REG_PARM_STACK_SPACE
2444 args_size.constant += argvec[count].size.constant;
2446 FUNCTION_ARG_ADVANCE (args_so_far, mode, (tree) 0, 1);
2450 #ifdef FINAL_REG_PARM_STACK_SPACE
2451 reg_parm_stack_space = FINAL_REG_PARM_STACK_SPACE (args_size.constant,
2455 /* If this machine requires an external definition for library
2456 functions, write one out. */
2457 assemble_external_libcall (fun);
2459 original_args_size = args_size;
2460 #ifdef STACK_BOUNDARY
2461 args_size.constant = (((args_size.constant + (STACK_BYTES - 1))
2462 / STACK_BYTES) * STACK_BYTES);
2465 #ifdef REG_PARM_STACK_SPACE
2466 args_size.constant = MAX (args_size.constant,
2467 reg_parm_stack_space);
2468 #ifndef OUTGOING_REG_PARM_STACK_SPACE
2469 args_size.constant -= reg_parm_stack_space;
2473 if (args_size.constant > current_function_outgoing_args_size)
2474 current_function_outgoing_args_size = args_size.constant;
2476 #ifdef ACCUMULATE_OUTGOING_ARGS
2477 /* Since the stack pointer will never be pushed, it is possible for
2478 the evaluation of a parm to clobber something we have already
2479 written to the stack. Since most function calls on RISC machines
2480 do not use the stack, this is uncommon, but must work correctly.
2482 Therefore, we save any area of the stack that was already written
2483 and that we are using. Here we set up to do this by making a new
2484 stack usage map from the old one.
2486 Another approach might be to try to reorder the argument
2487 evaluations to avoid this conflicting stack usage. */
2489 needed = args_size.constant;
2490 #if defined(REG_PARM_STACK_SPACE) && ! defined(OUTGOING_REG_PARM_STACK_SPACE)
2491 /* Since we will be writing into the entire argument area, the
2492 map must be allocated for its entire size, not just the part that
2493 is the responsibility of the caller. */
2494 needed += reg_parm_stack_space;
2497 #ifdef ARGS_GROW_DOWNWARD
2498 highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use,
2501 highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use,
2504 stack_usage_map = (char *) alloca (highest_outgoing_arg_in_use);
2506 if (initial_highest_arg_in_use)
2507 bcopy (initial_stack_usage_map, stack_usage_map,
2508 initial_highest_arg_in_use);
2510 if (initial_highest_arg_in_use != highest_outgoing_arg_in_use)
2511 bzero (&stack_usage_map[initial_highest_arg_in_use],
2512 highest_outgoing_arg_in_use - initial_highest_arg_in_use);
2515 /* The address of the outgoing argument list must not be copied to a
2516 register here, because argblock would be left pointing to the
2517 wrong place after the call to allocate_dynamic_stack_space below.
2520 argblock = virtual_outgoing_args_rtx;
2521 #else /* not ACCUMULATE_OUTGOING_ARGS */
2522 #ifndef PUSH_ROUNDING
2523 argblock = push_block (GEN_INT (args_size.constant), 0, 0);
2527 #ifdef PUSH_ARGS_REVERSED
2528 #ifdef STACK_BOUNDARY
2529 /* If we push args individually in reverse order, perform stack alignment
2530 before the first push (the last arg). */
2532 anti_adjust_stack (GEN_INT (args_size.constant
2533 - original_args_size.constant));
2537 #ifdef PUSH_ARGS_REVERSED
2545 #if defined(ACCUMULATE_OUTGOING_ARGS) && defined(REG_PARM_STACK_SPACE)
2546 /* The argument list is the property of the called routine and it
2547 may clobber it. If the fixed area has been used for previous
2548 parameters, we must save and restore it.
2550 Here we compute the boundary of the that needs to be saved, if any. */
2552 #ifdef ARGS_GROW_DOWNWARD
2553 for (count = 0; count < reg_parm_stack_space + 1; count++)
2555 for (count = 0; count < reg_parm_stack_space; count++)
2558 if (count >= highest_outgoing_arg_in_use
2559 || stack_usage_map[count] == 0)
2562 if (low_to_save == -1)
2563 low_to_save = count;
2565 high_to_save = count;
2568 if (low_to_save >= 0)
2570 int num_to_save = high_to_save - low_to_save + 1;
2571 enum machine_mode save_mode
2572 = mode_for_size (num_to_save * BITS_PER_UNIT, MODE_INT, 1);
2575 /* If we don't have the required alignment, must do this in BLKmode. */
2576 if ((low_to_save & (MIN (GET_MODE_SIZE (save_mode),
2577 BIGGEST_ALIGNMENT / UNITS_PER_WORD) - 1)))
2578 save_mode = BLKmode;
2580 #ifdef ARGS_GROW_DOWNWARD
2581 stack_area = gen_rtx_MEM (save_mode,
2582 memory_address (save_mode,
2583 plus_constant (argblock,
2586 stack_area = gen_rtx_MEM (save_mode,
2587 memory_address (save_mode,
2588 plus_constant (argblock,
2591 if (save_mode == BLKmode)
2593 save_area = assign_stack_temp (BLKmode, num_to_save, 0);
2594 MEM_IN_STRUCT_P (save_area) = 0;
2595 emit_block_move (validize_mem (save_area), stack_area,
2596 GEN_INT (num_to_save),
2597 PARM_BOUNDARY / BITS_PER_UNIT);
2601 save_area = gen_reg_rtx (save_mode);
2602 emit_move_insn (save_area, stack_area);
2607 /* Push the args that need to be pushed. */
2609 /* ARGNUM indexes the ARGVEC array in the order in which the arguments
2610 are to be pushed. */
2611 for (count = 0; count < nargs; count++, argnum += inc)
2613 register enum machine_mode mode = argvec[argnum].mode;
2614 register rtx val = argvec[argnum].value;
2615 rtx reg = argvec[argnum].reg;
2616 int partial = argvec[argnum].partial;
2617 #ifdef ACCUMULATE_OUTGOING_ARGS
2618 int lower_bound, upper_bound, i;
2621 if (! (reg != 0 && partial == 0))
2623 #ifdef ACCUMULATE_OUTGOING_ARGS
2624 /* If this is being stored into a pre-allocated, fixed-size, stack
2625 area, save any previous data at that location. */
2627 #ifdef ARGS_GROW_DOWNWARD
2628 /* stack_slot is negative, but we want to index stack_usage_map
2629 with positive values. */
2630 upper_bound = -argvec[argnum].offset.constant + 1;
2631 lower_bound = upper_bound - argvec[argnum].size.constant;
2633 lower_bound = argvec[argnum].offset.constant;
2634 upper_bound = lower_bound + argvec[argnum].size.constant;
2637 for (i = lower_bound; i < upper_bound; i++)
2638 if (stack_usage_map[i]
2639 #ifdef REG_PARM_STACK_SPACE
2640 /* Don't store things in the fixed argument area at this point;
2641 it has already been saved. */
2642 && i > reg_parm_stack_space
2647 if (i != upper_bound)
2649 /* We need to make a save area. See what mode we can make it. */
2650 enum machine_mode save_mode
2651 = mode_for_size (argvec[argnum].size.constant * BITS_PER_UNIT,
2654 = gen_rtx_MEM (save_mode,
2655 memory_address (save_mode,
2656 plus_constant (argblock, argvec[argnum].offset.constant)));
2657 argvec[argnum].save_area = gen_reg_rtx (save_mode);
2658 emit_move_insn (argvec[argnum].save_area, stack_area);
2661 emit_push_insn (val, mode, NULL_TREE, NULL_RTX, 0, partial, reg, 0,
2662 argblock, GEN_INT (argvec[argnum].offset.constant));
2664 #ifdef ACCUMULATE_OUTGOING_ARGS
2665 /* Now mark the segment we just used. */
2666 for (i = lower_bound; i < upper_bound; i++)
2667 stack_usage_map[i] = 1;
2674 #ifndef PUSH_ARGS_REVERSED
2675 #ifdef STACK_BOUNDARY
2676 /* If we pushed args in forward order, perform stack alignment
2677 after pushing the last arg. */
2679 anti_adjust_stack (GEN_INT (args_size.constant
2680 - original_args_size.constant));
2684 #ifdef PUSH_ARGS_REVERSED
2690 fun = prepare_call_address (fun, NULL_TREE, &call_fusage, 0);
2692 /* Now load any reg parms into their regs. */
2694 /* ARGNUM indexes the ARGVEC array in the order in which the arguments
2695 are to be pushed. */
2696 for (count = 0; count < nargs; count++, argnum += inc)
2698 register rtx val = argvec[argnum].value;
2699 rtx reg = argvec[argnum].reg;
2700 int partial = argvec[argnum].partial;
2702 if (reg != 0 && partial == 0)
2703 emit_move_insn (reg, val);
2707 /* For version 1.37, try deleting this entirely. */
2711 /* Any regs containing parms remain in use through the call. */
2712 for (count = 0; count < nargs; count++)
2713 if (argvec[count].reg != 0)
2714 use_reg (&call_fusage, argvec[count].reg);
2716 /* Don't allow popping to be deferred, since then
2717 cse'ing of library calls could delete a call and leave the pop. */
2720 /* We pass the old value of inhibit_defer_pop + 1 to emit_call_1, which
2721 will set inhibit_defer_pop to that value. */
2723 /* The return type is needed to decide how many bytes the function pops.
2724 Signedness plays no role in that, so for simplicity, we pretend it's
2725 always signed. We also assume that the list of arguments passed has
2726 no impact, so we pretend it is unknown. */
2729 get_identifier (XSTR (orgfun, 0)),
2730 build_function_type (outmode == VOIDmode ? void_type_node
2731 : type_for_mode (outmode, 0), NULL_TREE),
2732 args_size.constant, 0,
2733 FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1),
2734 outmode != VOIDmode ? hard_libcall_value (outmode) : NULL_RTX,
2735 old_inhibit_defer_pop + 1, call_fusage, no_queue);
2739 /* Now restore inhibit_defer_pop to its actual original value. */
2742 #ifdef ACCUMULATE_OUTGOING_ARGS
2743 #ifdef REG_PARM_STACK_SPACE
2746 enum machine_mode save_mode = GET_MODE (save_area);
2747 #ifdef ARGS_GROW_DOWNWARD
2749 = gen_rtx_MEM (save_mode,
2750 memory_address (save_mode,
2751 plus_constant (argblock,
2755 = gen_rtx_MEM (save_mode,
2756 memory_address (save_mode,
2757 plus_constant (argblock, low_to_save)));
2760 if (save_mode != BLKmode)
2761 emit_move_insn (stack_area, save_area);
2763 emit_block_move (stack_area, validize_mem (save_area),
2764 GEN_INT (high_to_save - low_to_save + 1),
2765 PARM_BOUNDARY / BITS_PER_UNIT);
2769 /* If we saved any argument areas, restore them. */
2770 for (count = 0; count < nargs; count++)
2771 if (argvec[count].save_area)
2773 enum machine_mode save_mode = GET_MODE (argvec[count].save_area);
2775 = gen_rtx_MEM (save_mode,
2776 memory_address (save_mode,
2777 plus_constant (argblock, argvec[count].offset.constant)));
2779 emit_move_insn (stack_area, argvec[count].save_area);
2782 highest_outgoing_arg_in_use = initial_highest_arg_in_use;
2783 stack_usage_map = initial_stack_usage_map;
2787 /* Like emit_library_call except that an extra argument, VALUE,
2788 comes second and says where to store the result.
2789 (If VALUE is zero, this function chooses a convenient way
2790 to return the value.
2792 This function returns an rtx for where the value is to be found.
2793 If VALUE is nonzero, VALUE is returned. */
2796 emit_library_call_value VPROTO((rtx orgfun, rtx value, int no_queue,
2797 enum machine_mode outmode, int nargs, ...))
2803 enum machine_mode outmode;
2807 /* Total size in bytes of all the stack-parms scanned so far. */
2808 struct args_size args_size;
2809 /* Size of arguments before any adjustments (such as rounding). */
2810 struct args_size original_args_size;
2811 register int argnum;
2816 CUMULATIVE_ARGS args_so_far;
2817 struct arg { rtx value; enum machine_mode mode; rtx reg; int partial;
2818 struct args_size offset; struct args_size size; rtx save_area; };
2820 int old_inhibit_defer_pop = inhibit_defer_pop;
2821 rtx call_fusage = 0;
2823 int pcc_struct_value = 0;
2824 int struct_value_size = 0;
2826 #ifdef ACCUMULATE_OUTGOING_ARGS
2830 #if defined(ACCUMULATE_OUTGOING_ARGS) && defined(REG_PARM_STACK_SPACE)
2831 /* Define the boundary of the register parm stack space that needs to be
2833 int low_to_save = -1, high_to_save;
2834 rtx save_area = 0; /* Place that it is saved */
2837 #ifdef ACCUMULATE_OUTGOING_ARGS
2838 /* Size of the stack reserved for parameter registers. */
2839 int reg_parm_stack_space = 0;
2840 int initial_highest_arg_in_use = highest_outgoing_arg_in_use;
2841 char *initial_stack_usage_map = stack_usage_map;
2844 #ifdef REG_PARM_STACK_SPACE
2845 #ifdef MAYBE_REG_PARM_STACK_SPACE
2846 reg_parm_stack_space = MAYBE_REG_PARM_STACK_SPACE;
2848 reg_parm_stack_space = REG_PARM_STACK_SPACE (fndecl);
2852 VA_START (p, nargs);
2855 orgfun = va_arg (p, rtx);
2856 value = va_arg (p, rtx);
2857 no_queue = va_arg (p, int);
2858 outmode = va_arg (p, enum machine_mode);
2859 nargs = va_arg (p, int);
2862 is_const = no_queue;
2865 /* If this kind of value comes back in memory,
2866 decide where in memory it should come back. */
2867 if (aggregate_value_p (type_for_mode (outmode, 0)))
2869 #ifdef PCC_STATIC_STRUCT_RETURN
2871 = hard_function_value (build_pointer_type (type_for_mode (outmode, 0)),
2873 mem_value = gen_rtx_MEM (outmode, pointer_reg);
2874 pcc_struct_value = 1;
2876 value = gen_reg_rtx (outmode);
2877 #else /* not PCC_STATIC_STRUCT_RETURN */
2878 struct_value_size = GET_MODE_SIZE (outmode);
2879 if (value != 0 && GET_CODE (value) == MEM)
2882 mem_value = assign_stack_temp (outmode, GET_MODE_SIZE (outmode), 0);
2885 /* This call returns a big structure. */
2889 /* ??? Unfinished: must pass the memory address as an argument. */
2891 /* Copy all the libcall-arguments out of the varargs data
2892 and into a vector ARGVEC.
2894 Compute how to pass each argument. We only support a very small subset
2895 of the full argument passing conventions to limit complexity here since
2896 library functions shouldn't have many args. */
2898 argvec = (struct arg *) alloca ((nargs + 1) * sizeof (struct arg));
2899 bzero ((char *) argvec, (nargs + 1) * sizeof (struct arg));
2901 INIT_CUMULATIVE_ARGS (args_so_far, NULL_TREE, fun, 0);
2903 args_size.constant = 0;
2910 /* If there's a structure value address to be passed,
2911 either pass it in the special place, or pass it as an extra argument. */
2912 if (mem_value && struct_value_rtx == 0 && ! pcc_struct_value)
2914 rtx addr = XEXP (mem_value, 0);
2917 /* Make sure it is a reasonable operand for a move or push insn. */
2918 if (GET_CODE (addr) != REG && GET_CODE (addr) != MEM
2919 && ! (CONSTANT_P (addr) && LEGITIMATE_CONSTANT_P (addr)))
2920 addr = force_operand (addr, NULL_RTX);
2922 argvec[count].value = addr;
2923 argvec[count].mode = Pmode;
2924 argvec[count].partial = 0;
2926 argvec[count].reg = FUNCTION_ARG (args_so_far, Pmode, NULL_TREE, 1);
2927 #ifdef FUNCTION_ARG_PARTIAL_NREGS
2928 if (FUNCTION_ARG_PARTIAL_NREGS (args_so_far, Pmode, NULL_TREE, 1))
2932 locate_and_pad_parm (Pmode, NULL_TREE,
2933 argvec[count].reg && argvec[count].partial == 0,
2934 NULL_TREE, &args_size, &argvec[count].offset,
2935 &argvec[count].size);
2938 if (argvec[count].reg == 0 || argvec[count].partial != 0
2939 #ifdef REG_PARM_STACK_SPACE
2943 args_size.constant += argvec[count].size.constant;
2945 FUNCTION_ARG_ADVANCE (args_so_far, Pmode, (tree) 0, 1);
2950 for (; count < nargs; count++)
2952 rtx val = va_arg (p, rtx);
2953 enum machine_mode mode = va_arg (p, enum machine_mode);
2955 /* We cannot convert the arg value to the mode the library wants here;
2956 must do it earlier where we know the signedness of the arg. */
2958 || (GET_MODE (val) != mode && GET_MODE (val) != VOIDmode))
2961 /* On some machines, there's no way to pass a float to a library fcn.
2962 Pass it as a double instead. */
2963 #ifdef LIBGCC_NEEDS_DOUBLE
2964 if (LIBGCC_NEEDS_DOUBLE && mode == SFmode)
2965 val = convert_modes (DFmode, SFmode, val, 0), mode = DFmode;
2968 /* There's no need to call protect_from_queue, because
2969 either emit_move_insn or emit_push_insn will do that. */
2971 /* Make sure it is a reasonable operand for a move or push insn. */
2972 if (GET_CODE (val) != REG && GET_CODE (val) != MEM
2973 && ! (CONSTANT_P (val) && LEGITIMATE_CONSTANT_P (val)))
2974 val = force_operand (val, NULL_RTX);
2976 #ifdef FUNCTION_ARG_PASS_BY_REFERENCE
2977 if (FUNCTION_ARG_PASS_BY_REFERENCE (args_so_far, mode, NULL_TREE, 1))
2979 /* We do not support FUNCTION_ARG_CALLEE_COPIES here since it can
2980 be viewed as just an efficiency improvement. */
2981 rtx slot = assign_stack_temp (mode, GET_MODE_SIZE (mode), 0);
2982 emit_move_insn (slot, val);
2983 val = XEXP (slot, 0);
2988 argvec[count].value = val;
2989 argvec[count].mode = mode;
2991 argvec[count].reg = FUNCTION_ARG (args_so_far, mode, NULL_TREE, 1);
2992 if (argvec[count].reg && GET_CODE (argvec[count].reg) == PARALLEL)
2994 #ifdef FUNCTION_ARG_PARTIAL_NREGS
2995 argvec[count].partial
2996 = FUNCTION_ARG_PARTIAL_NREGS (args_so_far, mode, NULL_TREE, 1);
2998 argvec[count].partial = 0;
3001 locate_and_pad_parm (mode, NULL_TREE,
3002 argvec[count].reg && argvec[count].partial == 0,
3003 NULL_TREE, &args_size, &argvec[count].offset,
3004 &argvec[count].size);
3006 if (argvec[count].size.var)
3009 #ifndef REG_PARM_STACK_SPACE
3010 if (argvec[count].partial)
3011 argvec[count].size.constant -= argvec[count].partial * UNITS_PER_WORD;
3014 if (argvec[count].reg == 0 || argvec[count].partial != 0
3015 #ifdef REG_PARM_STACK_SPACE
3019 args_size.constant += argvec[count].size.constant;
3021 FUNCTION_ARG_ADVANCE (args_so_far, mode, (tree) 0, 1);
3025 #ifdef FINAL_REG_PARM_STACK_SPACE
3026 reg_parm_stack_space = FINAL_REG_PARM_STACK_SPACE (args_size.constant,
3029 /* If this machine requires an external definition for library
3030 functions, write one out. */
3031 assemble_external_libcall (fun);
3033 original_args_size = args_size;
3034 #ifdef STACK_BOUNDARY
3035 args_size.constant = (((args_size.constant + (STACK_BYTES - 1))
3036 / STACK_BYTES) * STACK_BYTES);
3039 #ifdef REG_PARM_STACK_SPACE
3040 args_size.constant = MAX (args_size.constant,
3041 reg_parm_stack_space);
3042 #ifndef OUTGOING_REG_PARM_STACK_SPACE
3043 args_size.constant -= reg_parm_stack_space;
3047 if (args_size.constant > current_function_outgoing_args_size)
3048 current_function_outgoing_args_size = args_size.constant;
3050 #ifdef ACCUMULATE_OUTGOING_ARGS
3051 /* Since the stack pointer will never be pushed, it is possible for
3052 the evaluation of a parm to clobber something we have already
3053 written to the stack. Since most function calls on RISC machines
3054 do not use the stack, this is uncommon, but must work correctly.
3056 Therefore, we save any area of the stack that was already written
3057 and that we are using. Here we set up to do this by making a new
3058 stack usage map from the old one.
3060 Another approach might be to try to reorder the argument
3061 evaluations to avoid this conflicting stack usage. */
3063 needed = args_size.constant;
3064 #if defined(REG_PARM_STACK_SPACE) && ! defined(OUTGOING_REG_PARM_STACK_SPACE)
3065 /* Since we will be writing into the entire argument area, the
3066 map must be allocated for its entire size, not just the part that
3067 is the responsibility of the caller. */
3068 needed += reg_parm_stack_space;
3071 #ifdef ARGS_GROW_DOWNWARD
3072 highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use,
3075 highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use,
3078 stack_usage_map = (char *) alloca (highest_outgoing_arg_in_use);
3080 if (initial_highest_arg_in_use)
3081 bcopy (initial_stack_usage_map, stack_usage_map,
3082 initial_highest_arg_in_use);
3084 if (initial_highest_arg_in_use != highest_outgoing_arg_in_use)
3085 bzero (&stack_usage_map[initial_highest_arg_in_use],
3086 highest_outgoing_arg_in_use - initial_highest_arg_in_use);
3089 /* The address of the outgoing argument list must not be copied to a
3090 register here, because argblock would be left pointing to the
3091 wrong place after the call to allocate_dynamic_stack_space below.
3094 argblock = virtual_outgoing_args_rtx;
3095 #else /* not ACCUMULATE_OUTGOING_ARGS */
3096 #ifndef PUSH_ROUNDING
3097 argblock = push_block (GEN_INT (args_size.constant), 0, 0);
3101 #ifdef PUSH_ARGS_REVERSED
3102 #ifdef STACK_BOUNDARY
3103 /* If we push args individually in reverse order, perform stack alignment
3104 before the first push (the last arg). */
3106 anti_adjust_stack (GEN_INT (args_size.constant
3107 - original_args_size.constant));
3111 #ifdef PUSH_ARGS_REVERSED
3119 #if defined(ACCUMULATE_OUTGOING_ARGS) && defined(REG_PARM_STACK_SPACE)
3120 /* The argument list is the property of the called routine and it
3121 may clobber it. If the fixed area has been used for previous
3122 parameters, we must save and restore it.
3124 Here we compute the boundary of the that needs to be saved, if any. */
3126 #ifdef ARGS_GROW_DOWNWARD
3127 for (count = 0; count < reg_parm_stack_space + 1; count++)
3129 for (count = 0; count < reg_parm_stack_space; count++)
3132 if (count >= highest_outgoing_arg_in_use
3133 || stack_usage_map[count] == 0)
3136 if (low_to_save == -1)
3137 low_to_save = count;
3139 high_to_save = count;
3142 if (low_to_save >= 0)
3144 int num_to_save = high_to_save - low_to_save + 1;
3145 enum machine_mode save_mode
3146 = mode_for_size (num_to_save * BITS_PER_UNIT, MODE_INT, 1);
3149 /* If we don't have the required alignment, must do this in BLKmode. */
3150 if ((low_to_save & (MIN (GET_MODE_SIZE (save_mode),
3151 BIGGEST_ALIGNMENT / UNITS_PER_WORD) - 1)))
3152 save_mode = BLKmode;
3154 #ifdef ARGS_GROW_DOWNWARD
3155 stack_area = gen_rtx_MEM (save_mode,
3156 memory_address (save_mode,
3157 plus_constant (argblock,
3160 stack_area = gen_rtx_MEM (save_mode,
3161 memory_address (save_mode,
3162 plus_constant (argblock,
3165 if (save_mode == BLKmode)
3167 save_area = assign_stack_temp (BLKmode, num_to_save, 0);
3168 MEM_IN_STRUCT_P (save_area) = 0;
3169 emit_block_move (validize_mem (save_area), stack_area,
3170 GEN_INT (num_to_save),
3171 PARM_BOUNDARY / BITS_PER_UNIT);
3175 save_area = gen_reg_rtx (save_mode);
3176 emit_move_insn (save_area, stack_area);
3181 /* Push the args that need to be pushed. */
3183 /* ARGNUM indexes the ARGVEC array in the order in which the arguments
3184 are to be pushed. */
3185 for (count = 0; count < nargs; count++, argnum += inc)
3187 register enum machine_mode mode = argvec[argnum].mode;
3188 register rtx val = argvec[argnum].value;
3189 rtx reg = argvec[argnum].reg;
3190 int partial = argvec[argnum].partial;
3191 #ifdef ACCUMULATE_OUTGOING_ARGS
3192 int lower_bound, upper_bound, i;
3195 if (! (reg != 0 && partial == 0))
3197 #ifdef ACCUMULATE_OUTGOING_ARGS
3198 /* If this is being stored into a pre-allocated, fixed-size, stack
3199 area, save any previous data at that location. */
3201 #ifdef ARGS_GROW_DOWNWARD
3202 /* stack_slot is negative, but we want to index stack_usage_map
3203 with positive values. */
3204 upper_bound = -argvec[argnum].offset.constant + 1;
3205 lower_bound = upper_bound - argvec[argnum].size.constant;
3207 lower_bound = argvec[argnum].offset.constant;
3208 upper_bound = lower_bound + argvec[argnum].size.constant;
3211 for (i = lower_bound; i < upper_bound; i++)
3212 if (stack_usage_map[i]
3213 #ifdef REG_PARM_STACK_SPACE
3214 /* Don't store things in the fixed argument area at this point;
3215 it has already been saved. */
3216 && i > reg_parm_stack_space
3221 if (i != upper_bound)
3223 /* We need to make a save area. See what mode we can make it. */
3224 enum machine_mode save_mode
3225 = mode_for_size (argvec[argnum].size.constant * BITS_PER_UNIT,
3228 = gen_rtx_MEM (save_mode,
3229 memory_address (save_mode,
3230 plus_constant (argblock,
3231 argvec[argnum].offset.constant)));
3232 argvec[argnum].save_area = gen_reg_rtx (save_mode);
3233 emit_move_insn (argvec[argnum].save_area, stack_area);
3236 emit_push_insn (val, mode, NULL_TREE, NULL_RTX, 0, partial, reg, 0,
3237 argblock, GEN_INT (argvec[argnum].offset.constant));
3239 #ifdef ACCUMULATE_OUTGOING_ARGS
3240 /* Now mark the segment we just used. */
3241 for (i = lower_bound; i < upper_bound; i++)
3242 stack_usage_map[i] = 1;
3249 #ifndef PUSH_ARGS_REVERSED
3250 #ifdef STACK_BOUNDARY
3251 /* If we pushed args in forward order, perform stack alignment
3252 after pushing the last arg. */
3254 anti_adjust_stack (GEN_INT (args_size.constant
3255 - original_args_size.constant));
3259 #ifdef PUSH_ARGS_REVERSED
3265 fun = prepare_call_address (fun, NULL_TREE, &call_fusage, 0);
3267 /* Now load any reg parms into their regs. */
3269 /* ARGNUM indexes the ARGVEC array in the order in which the arguments
3270 are to be pushed. */
3271 for (count = 0; count < nargs; count++, argnum += inc)
3273 register rtx val = argvec[argnum].value;
3274 rtx reg = argvec[argnum].reg;
3275 int partial = argvec[argnum].partial;
3277 if (reg != 0 && partial == 0)
3278 emit_move_insn (reg, val);
3283 /* For version 1.37, try deleting this entirely. */
3288 /* Any regs containing parms remain in use through the call. */
3289 for (count = 0; count < nargs; count++)
3290 if (argvec[count].reg != 0)
3291 use_reg (&call_fusage, argvec[count].reg);
3293 /* Pass the function the address in which to return a structure value. */
3294 if (mem_value != 0 && struct_value_rtx != 0 && ! pcc_struct_value)
3296 emit_move_insn (struct_value_rtx,
3298 force_operand (XEXP (mem_value, 0),
3300 if (GET_CODE (struct_value_rtx) == REG)
3301 use_reg (&call_fusage, struct_value_rtx);
3304 /* Don't allow popping to be deferred, since then
3305 cse'ing of library calls could delete a call and leave the pop. */
3308 /* We pass the old value of inhibit_defer_pop + 1 to emit_call_1, which
3309 will set inhibit_defer_pop to that value. */
3310 /* See the comment in emit_library_call about the function type we build
3314 get_identifier (XSTR (orgfun, 0)),
3315 build_function_type (type_for_mode (outmode, 0), NULL_TREE),
3316 args_size.constant, struct_value_size,
3317 FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1),
3318 mem_value == 0 ? hard_libcall_value (outmode) : NULL_RTX,
3319 old_inhibit_defer_pop + 1, call_fusage, is_const);
3321 /* Now restore inhibit_defer_pop to its actual original value. */
3326 /* Copy the value to the right place. */
3327 if (outmode != VOIDmode)
3333 if (value != mem_value)
3334 emit_move_insn (value, mem_value);
3336 else if (value != 0)
3337 emit_move_insn (value, hard_libcall_value (outmode));
3339 value = hard_libcall_value (outmode);
3342 #ifdef ACCUMULATE_OUTGOING_ARGS
3343 #ifdef REG_PARM_STACK_SPACE
3346 enum machine_mode save_mode = GET_MODE (save_area);
3347 #ifdef ARGS_GROW_DOWNWARD
3349 = gen_rtx_MEM (save_mode,
3350 memory_address (save_mode,
3351 plus_constant (argblock,
3355 = gen_rtx_MEM (save_mode,
3356 memory_address (save_mode,
3357 plus_constant (argblock, low_to_save)));
3359 if (save_mode != BLKmode)
3360 emit_move_insn (stack_area, save_area);
3362 emit_block_move (stack_area, validize_mem (save_area),
3363 GEN_INT (high_to_save - low_to_save + 1),
3364 PARM_BOUNDARY / BITS_PER_UNIT);
3368 /* If we saved any argument areas, restore them. */
3369 for (count = 0; count < nargs; count++)
3370 if (argvec[count].save_area)
3372 enum machine_mode save_mode = GET_MODE (argvec[count].save_area);
3374 = gen_rtx_MEM (save_mode,
3375 memory_address (save_mode, plus_constant (argblock,
3376 argvec[count].offset.constant)));
3378 emit_move_insn (stack_area, argvec[count].save_area);
3381 highest_outgoing_arg_in_use = initial_highest_arg_in_use;
3382 stack_usage_map = initial_stack_usage_map;
3389 /* Return an rtx which represents a suitable home on the stack
3390 given TYPE, the type of the argument looking for a home.
3391 This is called only for BLKmode arguments.
3393 SIZE is the size needed for this target.
3394 ARGS_ADDR is the address of the bottom of the argument block for this call.
3395 OFFSET describes this parameter's offset into ARGS_ADDR. It is meaningless
3396 if this machine uses push insns. */
3399 target_for_arg (type, size, args_addr, offset)
3403 struct args_size offset;
3406 rtx offset_rtx = ARGS_SIZE_RTX (offset);
3408 /* We do not call memory_address if possible,
3409 because we want to address as close to the stack
3410 as possible. For non-variable sized arguments,
3411 this will be stack-pointer relative addressing. */
3412 if (GET_CODE (offset_rtx) == CONST_INT)
3413 target = plus_constant (args_addr, INTVAL (offset_rtx));
3416 /* I have no idea how to guarantee that this
3417 will work in the presence of register parameters. */
3418 target = gen_rtx_PLUS (Pmode, args_addr, offset_rtx);
3419 target = memory_address (QImode, target);
3422 return gen_rtx_MEM (BLKmode, target);
3426 /* Store a single argument for a function call
3427 into the register or memory area where it must be passed.
3428 *ARG describes the argument value and where to pass it.
3430 ARGBLOCK is the address of the stack-block for all the arguments,
3431 or 0 on a machine where arguments are pushed individually.
3433 MAY_BE_ALLOCA nonzero says this could be a call to `alloca'
3434 so must be careful about how the stack is used.
3436 VARIABLE_SIZE nonzero says that this was a variable-sized outgoing
3437 argument stack. This is used if ACCUMULATE_OUTGOING_ARGS to indicate
3438 that we need not worry about saving and restoring the stack.
3440 FNDECL is the declaration of the function we are calling. */
3443 store_one_arg (arg, argblock, may_be_alloca, variable_size, fndecl,
3444 reg_parm_stack_space)
3445 struct arg_data *arg;
3450 int reg_parm_stack_space;
3452 register tree pval = arg->tree_value;
3456 #ifdef ACCUMULATE_OUTGOING_ARGS
3457 int i, lower_bound, upper_bound;
3460 if (TREE_CODE (pval) == ERROR_MARK)
3463 /* Push a new temporary level for any temporaries we make for
3467 #ifdef ACCUMULATE_OUTGOING_ARGS
3468 /* If this is being stored into a pre-allocated, fixed-size, stack area,
3469 save any previous data at that location. */
3470 if (argblock && ! variable_size && arg->stack)
3472 #ifdef ARGS_GROW_DOWNWARD
3473 /* stack_slot is negative, but we want to index stack_usage_map
3474 with positive values. */
3475 if (GET_CODE (XEXP (arg->stack_slot, 0)) == PLUS)
3476 upper_bound = -INTVAL (XEXP (XEXP (arg->stack_slot, 0), 1)) + 1;
3480 lower_bound = upper_bound - arg->size.constant;
3482 if (GET_CODE (XEXP (arg->stack_slot, 0)) == PLUS)
3483 lower_bound = INTVAL (XEXP (XEXP (arg->stack_slot, 0), 1));
3487 upper_bound = lower_bound + arg->size.constant;
3490 for (i = lower_bound; i < upper_bound; i++)
3491 if (stack_usage_map[i]
3492 #ifdef REG_PARM_STACK_SPACE
3493 /* Don't store things in the fixed argument area at this point;
3494 it has already been saved. */
3495 && i > reg_parm_stack_space
3500 if (i != upper_bound)
3502 /* We need to make a save area. See what mode we can make it. */
3503 enum machine_mode save_mode
3504 = mode_for_size (arg->size.constant * BITS_PER_UNIT, MODE_INT, 1);
3506 = gen_rtx_MEM (save_mode,
3507 memory_address (save_mode,
3508 XEXP (arg->stack_slot, 0)));
3510 if (save_mode == BLKmode)
3512 arg->save_area = assign_stack_temp (BLKmode,
3513 arg->size.constant, 0);
3514 MEM_IN_STRUCT_P (arg->save_area)
3515 = AGGREGATE_TYPE_P (TREE_TYPE (arg->tree_value));
3516 preserve_temp_slots (arg->save_area);
3517 emit_block_move (validize_mem (arg->save_area), stack_area,
3518 GEN_INT (arg->size.constant),
3519 PARM_BOUNDARY / BITS_PER_UNIT);
3523 arg->save_area = gen_reg_rtx (save_mode);
3524 emit_move_insn (arg->save_area, stack_area);
3530 /* If this isn't going to be placed on both the stack and in registers,
3531 set up the register and number of words. */
3532 if (! arg->pass_on_stack)
3533 reg = arg->reg, partial = arg->partial;
3535 if (reg != 0 && partial == 0)
3536 /* Being passed entirely in a register. We shouldn't be called in
3540 /* If this arg needs special alignment, don't load the registers
3542 if (arg->n_aligned_regs != 0)
3545 /* If this is being passed partially in a register, we can't evaluate
3546 it directly into its stack slot. Otherwise, we can. */
3547 if (arg->value == 0)
3549 #ifdef ACCUMULATE_OUTGOING_ARGS
3550 /* stack_arg_under_construction is nonzero if a function argument is
3551 being evaluated directly into the outgoing argument list and
3552 expand_call must take special action to preserve the argument list
3553 if it is called recursively.
3555 For scalar function arguments stack_usage_map is sufficient to
3556 determine which stack slots must be saved and restored. Scalar
3557 arguments in general have pass_on_stack == 0.
3559 If this argument is initialized by a function which takes the
3560 address of the argument (a C++ constructor or a C function
3561 returning a BLKmode structure), then stack_usage_map is
3562 insufficient and expand_call must push the stack around the
3563 function call. Such arguments have pass_on_stack == 1.
3565 Note that it is always safe to set stack_arg_under_construction,
3566 but this generates suboptimal code if set when not needed. */
3568 if (arg->pass_on_stack)
3569 stack_arg_under_construction++;
3571 arg->value = expand_expr (pval,
3573 || TYPE_MODE (TREE_TYPE (pval)) != arg->mode)
3574 ? NULL_RTX : arg->stack,
3577 /* If we are promoting object (or for any other reason) the mode
3578 doesn't agree, convert the mode. */
3580 if (arg->mode != TYPE_MODE (TREE_TYPE (pval)))
3581 arg->value = convert_modes (arg->mode, TYPE_MODE (TREE_TYPE (pval)),
3582 arg->value, arg->unsignedp);
3584 #ifdef ACCUMULATE_OUTGOING_ARGS
3585 if (arg->pass_on_stack)
3586 stack_arg_under_construction--;
3590 /* Don't allow anything left on stack from computation
3591 of argument to alloca. */
3593 do_pending_stack_adjust ();
3595 if (arg->value == arg->stack)
3597 /* If the value is already in the stack slot, we are done. */
3598 if (flag_check_memory_usage && GET_CODE (arg->stack) == MEM)
3600 if (arg->mode == BLKmode)
3603 emit_library_call (chkr_set_right_libfunc, 1, VOIDmode, 3,
3604 XEXP (arg->stack, 0), ptr_mode,
3605 GEN_INT (GET_MODE_SIZE (arg->mode)),
3606 TYPE_MODE (sizetype),
3607 GEN_INT (MEMORY_USE_RW),
3608 TYPE_MODE (integer_type_node));
3611 else if (arg->mode != BLKmode)
3615 /* Argument is a scalar, not entirely passed in registers.
3616 (If part is passed in registers, arg->partial says how much
3617 and emit_push_insn will take care of putting it there.)
3619 Push it, and if its size is less than the
3620 amount of space allocated to it,
3621 also bump stack pointer by the additional space.
3622 Note that in C the default argument promotions
3623 will prevent such mismatches. */
3625 size = GET_MODE_SIZE (arg->mode);
3626 /* Compute how much space the push instruction will push.
3627 On many machines, pushing a byte will advance the stack
3628 pointer by a halfword. */
3629 #ifdef PUSH_ROUNDING
3630 size = PUSH_ROUNDING (size);
3634 /* Compute how much space the argument should get:
3635 round up to a multiple of the alignment for arguments. */
3636 if (none != FUNCTION_ARG_PADDING (arg->mode, TREE_TYPE (pval)))
3637 used = (((size + PARM_BOUNDARY / BITS_PER_UNIT - 1)
3638 / (PARM_BOUNDARY / BITS_PER_UNIT))
3639 * (PARM_BOUNDARY / BITS_PER_UNIT));
3641 /* This isn't already where we want it on the stack, so put it there.
3642 This can either be done with push or copy insns. */
3643 emit_push_insn (arg->value, arg->mode, TREE_TYPE (pval), NULL_RTX,
3644 0, partial, reg, used - size,
3645 argblock, ARGS_SIZE_RTX (arg->offset));
3649 /* BLKmode, at least partly to be pushed. */
3651 register int excess;
3654 /* Pushing a nonscalar.
3655 If part is passed in registers, PARTIAL says how much
3656 and emit_push_insn will take care of putting it there. */
3658 /* Round its size up to a multiple
3659 of the allocation unit for arguments. */
3661 if (arg->size.var != 0)
3664 size_rtx = ARGS_SIZE_RTX (arg->size);
3668 /* PUSH_ROUNDING has no effect on us, because
3669 emit_push_insn for BLKmode is careful to avoid it. */
3670 excess = (arg->size.constant - int_size_in_bytes (TREE_TYPE (pval))
3671 + partial * UNITS_PER_WORD);
3672 size_rtx = expr_size (pval);
3675 emit_push_insn (arg->value, arg->mode, TREE_TYPE (pval), size_rtx,
3676 TYPE_ALIGN (TREE_TYPE (pval)) / BITS_PER_UNIT, partial,
3677 reg, excess, argblock, ARGS_SIZE_RTX (arg->offset));
3681 /* Unless this is a partially-in-register argument, the argument is now
3684 ??? Note that this can change arg->value from arg->stack to
3685 arg->stack_slot and it matters when they are not the same.
3686 It isn't totally clear that this is correct in all cases. */
3688 arg->value = arg->stack_slot;
3690 /* Once we have pushed something, pops can't safely
3691 be deferred during the rest of the arguments. */
3694 /* ANSI doesn't require a sequence point here,
3695 but PCC has one, so this will avoid some problems. */
3698 /* Free any temporary slots made in processing this argument. Show
3699 that we might have taken the address of something and pushed that
3701 preserve_temp_slots (NULL_RTX);
3705 #ifdef ACCUMULATE_OUTGOING_ARGS
3706 /* Now mark the segment we just used. */
3707 if (argblock && ! variable_size && arg->stack)
3708 for (i = lower_bound; i < upper_bound; i++)
3709 stack_usage_map[i] = 1;