1 /* Convert function calls to rtl insns, for GNU C compiler.
2 Copyright (C) 1989, 92, 93, 94, 95, 96, 1997 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 /* Tree node for the function to be called (not the address!). */
492 /* Data type of the function. */
494 /* Declaration of the function being called,
495 or 0 if the function is computed (not known by name). */
499 /* Register in which non-BLKmode value will be returned,
500 or 0 if no value or if value is BLKmode. */
502 /* Address where we should return a BLKmode value;
503 0 if value not BLKmode. */
504 rtx structure_value_addr = 0;
505 /* Nonzero if that address is being passed by treating it as
506 an extra, implicit first parameter. Otherwise,
507 it is passed by being copied directly into struct_value_rtx. */
508 int structure_value_addr_parm = 0;
509 /* Size of aggregate value wanted, or zero if none wanted
510 or if we are using the non-reentrant PCC calling convention
511 or expecting the value in registers. */
512 int struct_value_size = 0;
513 /* Nonzero if called function returns an aggregate in memory PCC style,
514 by returning the address of where to find it. */
515 int pcc_struct_value = 0;
517 /* Number of actual parameters in this call, including struct value addr. */
519 /* Number of named args. Args after this are anonymous ones
520 and they must all go on the stack. */
522 /* Count arg position in order args appear. */
525 /* Vector of information about each argument.
526 Arguments are numbered in the order they will be pushed,
527 not the order they are written. */
528 struct arg_data *args;
530 /* Total size in bytes of all the stack-parms scanned so far. */
531 struct args_size args_size;
532 /* Size of arguments before any adjustments (such as rounding). */
533 struct args_size original_args_size;
534 /* Data on reg parms scanned so far. */
535 CUMULATIVE_ARGS args_so_far;
536 /* Nonzero if a reg parm has been scanned. */
538 /* Nonzero if this is an indirect function call. */
540 /* Nonzero if we must avoid push-insns in the args for this call.
541 If stack space is allocated for register parameters, but not by the
542 caller, then it is preallocated in the fixed part of the stack frame.
543 So the entire argument block must then be preallocated (i.e., we
544 ignore PUSH_ROUNDING in that case). */
546 #if defined(REG_PARM_STACK_SPACE) && ! defined(OUTGOING_REG_PARM_STACK_SPACE)
547 int must_preallocate = 1;
550 int must_preallocate = 0;
552 int must_preallocate = 1;
556 /* Size of the stack reserved for parameter registers. */
557 int reg_parm_stack_space = 0;
559 /* 1 if scanning parms front to back, -1 if scanning back to front. */
561 /* Address of space preallocated for stack parms
562 (on machines that lack push insns), or 0 if space not preallocated. */
565 /* Nonzero if it is plausible that this is a call to alloca. */
567 /* Nonzero if this is a call to malloc or a related function. */
569 /* Nonzero if this is a call to setjmp or a related function. */
571 /* Nonzero if this is a call to `longjmp'. */
573 /* Nonzero if this is a call to an inline function. */
574 int is_integrable = 0;
575 /* Nonzero if this is a call to a `const' function.
576 Note that only explicitly named functions are handled as `const' here. */
578 /* Nonzero if this is a call to a `volatile' function. */
580 #if defined(ACCUMULATE_OUTGOING_ARGS) && defined(REG_PARM_STACK_SPACE)
581 /* Define the boundary of the register parm stack space that needs to be
583 int low_to_save = -1, high_to_save;
584 rtx save_area = 0; /* Place that it is saved */
587 #ifdef ACCUMULATE_OUTGOING_ARGS
588 int initial_highest_arg_in_use = highest_outgoing_arg_in_use;
589 char *initial_stack_usage_map = stack_usage_map;
592 rtx old_stack_level = 0;
593 int old_pending_adj = 0;
594 int old_stack_arg_under_construction;
595 int old_inhibit_defer_pop = inhibit_defer_pop;
600 /* The value of the function call can be put in a hard register. But
601 if -fcheck-memory-usage, code which invokes functions (and thus
602 damages some hard registers) can be inserted before using the value.
603 So, target is always a pseudo-register in that case. */
604 if (flag_check_memory_usage)
607 /* See if we can find a DECL-node for the actual function.
608 As a result, decide whether this is a call to an integrable function. */
610 p = TREE_OPERAND (exp, 0);
611 if (TREE_CODE (p) == ADDR_EXPR)
613 fndecl = TREE_OPERAND (p, 0);
614 if (TREE_CODE (fndecl) != FUNCTION_DECL)
619 && fndecl != current_function_decl
620 && DECL_INLINE (fndecl)
621 && DECL_SAVED_INSNS (fndecl)
622 && RTX_INTEGRATED_P (DECL_SAVED_INSNS (fndecl)))
624 else if (! TREE_ADDRESSABLE (fndecl))
626 /* In case this function later becomes inlinable,
627 record that there was already a non-inline call to it.
629 Use abstraction instead of setting TREE_ADDRESSABLE
631 if (DECL_INLINE (fndecl) && warn_inline && !flag_no_inline
634 warning_with_decl (fndecl, "can't inline call to `%s'");
635 warning ("called from here");
637 mark_addressable (fndecl);
640 if (TREE_READONLY (fndecl) && ! TREE_THIS_VOLATILE (fndecl)
641 && TYPE_MODE (TREE_TYPE (exp)) != VOIDmode)
644 if (TREE_THIS_VOLATILE (fndecl))
649 /* If we don't have specific function to call, see if we have a
650 constant or `noreturn' function from the type. */
653 is_const = TREE_READONLY (TREE_TYPE (TREE_TYPE (p)));
654 is_volatile = TREE_THIS_VOLATILE (TREE_TYPE (TREE_TYPE (p)));
657 #ifdef REG_PARM_STACK_SPACE
658 #ifdef MAYBE_REG_PARM_STACK_SPACE
659 reg_parm_stack_space = MAYBE_REG_PARM_STACK_SPACE;
661 reg_parm_stack_space = REG_PARM_STACK_SPACE (fndecl);
665 /* Warn if this value is an aggregate type,
666 regardless of which calling convention we are using for it. */
667 if (warn_aggregate_return && AGGREGATE_TYPE_P (TREE_TYPE (exp)))
668 warning ("function call has aggregate value");
670 /* Set up a place to return a structure. */
672 /* Cater to broken compilers. */
673 if (aggregate_value_p (exp))
675 /* This call returns a big structure. */
678 #ifdef PCC_STATIC_STRUCT_RETURN
680 pcc_struct_value = 1;
681 /* Easier than making that case work right. */
684 /* In case this is a static function, note that it has been
686 if (! TREE_ADDRESSABLE (fndecl))
687 mark_addressable (fndecl);
691 #else /* not PCC_STATIC_STRUCT_RETURN */
693 struct_value_size = int_size_in_bytes (TREE_TYPE (exp));
695 if (target && GET_CODE (target) == MEM)
696 structure_value_addr = XEXP (target, 0);
699 /* Assign a temporary to hold the value. */
702 /* For variable-sized objects, we must be called with a target
703 specified. If we were to allocate space on the stack here,
704 we would have no way of knowing when to free it. */
706 if (struct_value_size < 0)
709 /* This DECL is just something to feed to mark_addressable;
710 it doesn't get pushed. */
711 d = build_decl (VAR_DECL, NULL_TREE, TREE_TYPE (exp));
712 DECL_RTL (d) = assign_temp (TREE_TYPE (exp), 1, 0, 1);
713 mark_addressable (d);
714 structure_value_addr = XEXP (DECL_RTL (d), 0);
715 MEM_IN_STRUCT_P (structure_value_addr)
716 = AGGREGATE_TYPE_P (TREE_TYPE (exp));
720 #endif /* not PCC_STATIC_STRUCT_RETURN */
723 /* If called function is inline, try to integrate it. */
728 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 ((HOST_WIDE_INT) temp != -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)
858 /* Disregard prefix _, __ or __x. */
861 if (name[1] == '_' && name[2] == 'x')
863 else if (name[1] == '_')
873 && (! strcmp (tname, "setjmp")
874 || ! strcmp (tname, "setjmp_syscall")))
876 && ! strcmp (tname, "sigsetjmp"))
878 && ! strcmp (tname, "savectx")));
880 && ! strcmp (tname, "siglongjmp"))
883 else if ((tname[0] == 'q' && tname[1] == 's'
884 && ! strcmp (tname, "qsetjmp"))
885 || (tname[0] == 'v' && tname[1] == 'f'
886 && ! strcmp (tname, "vfork")))
889 else if (tname[0] == 'l' && tname[1] == 'o'
890 && ! strcmp (tname, "longjmp"))
892 /* XXX should have "malloc" attribute on functions instead
893 of recognizing them by name. */
894 else if (! strcmp (tname, "malloc")
895 || ! strcmp (tname, "calloc")
896 || ! strcmp (tname, "realloc")
897 || ! strcmp (tname, "__builtin_new")
898 || ! strcmp (tname, "__builtin_vec_new"))
903 current_function_calls_alloca = 1;
905 /* Don't let pending stack adjusts add up to too much.
906 Also, do all pending adjustments now
907 if there is any chance this might be a call to alloca. */
909 if (pending_stack_adjust >= 32
910 || (pending_stack_adjust > 0 && may_be_alloca))
911 do_pending_stack_adjust ();
913 /* Operand 0 is a pointer-to-function; get the type of the function. */
914 funtype = TREE_TYPE (TREE_OPERAND (exp, 0));
915 if (TREE_CODE (funtype) != POINTER_TYPE)
917 funtype = TREE_TYPE (funtype);
919 /* Push the temporary stack slot level so that we can free any temporaries
923 /* Start updating where the next arg would go.
925 On some machines (such as the PA) indirect calls have a different
926 calling convention than normal calls. The last argument in
927 INIT_CUMULATIVE_ARGS tells the backend if this is an indirect call
929 INIT_CUMULATIVE_ARGS (args_so_far, funtype, NULL_RTX, (fndecl == 0));
931 /* If struct_value_rtx is 0, it means pass the address
932 as if it were an extra parameter. */
933 if (structure_value_addr && struct_value_rtx == 0)
935 /* If structure_value_addr is a REG other than
936 virtual_outgoing_args_rtx, we can use always use it. If it
937 is not a REG, we must always copy it into a register.
938 If it is virtual_outgoing_args_rtx, we must copy it to another
939 register in some cases. */
940 rtx temp = (GET_CODE (structure_value_addr) != REG
941 #ifdef ACCUMULATE_OUTGOING_ARGS
942 || (stack_arg_under_construction
943 && structure_value_addr == virtual_outgoing_args_rtx)
945 ? copy_addr_to_reg (structure_value_addr)
946 : structure_value_addr);
949 = tree_cons (error_mark_node,
950 make_tree (build_pointer_type (TREE_TYPE (funtype)),
953 structure_value_addr_parm = 1;
956 /* Count the arguments and set NUM_ACTUALS. */
957 for (p = actparms, i = 0; p; p = TREE_CHAIN (p)) i++;
960 /* Compute number of named args.
961 Normally, don't include the last named arg if anonymous args follow.
962 We do include the last named arg if STRICT_ARGUMENT_NAMING is defined.
963 (If no anonymous args follow, the result of list_length is actually
964 one too large. This is harmless.)
966 If SETUP_INCOMING_VARARGS is defined and STRICT_ARGUMENT_NAMING is not,
967 this machine will be able to place unnamed args that were passed in
968 registers into the stack. So treat all args as named. This allows the
969 insns emitting for a specific argument list to be independent of the
970 function declaration.
972 If SETUP_INCOMING_VARARGS is not defined, we do not have any reliable
973 way to pass unnamed args in registers, so we must force them into
975 #if !defined(SETUP_INCOMING_VARARGS) || defined(STRICT_ARGUMENT_NAMING)
976 if (TYPE_ARG_TYPES (funtype) != 0)
978 = (list_length (TYPE_ARG_TYPES (funtype))
979 #ifndef STRICT_ARGUMENT_NAMING
980 /* Don't include the last named arg. */
983 /* Count the struct value address, if it is passed as a parm. */
984 + structure_value_addr_parm);
987 /* If we know nothing, treat all args as named. */
988 n_named_args = num_actuals;
990 /* Make a vector to hold all the information about each arg. */
991 args = (struct arg_data *) alloca (num_actuals * sizeof (struct arg_data));
992 bzero ((char *) args, num_actuals * sizeof (struct arg_data));
994 args_size.constant = 0;
997 /* In this loop, we consider args in the order they are written.
998 We fill up ARGS from the front or from the back if necessary
999 so that in any case the first arg to be pushed ends up at the front. */
1001 #ifdef PUSH_ARGS_REVERSED
1002 i = num_actuals - 1, inc = -1;
1003 /* In this case, must reverse order of args
1004 so that we compute and push the last arg first. */
1009 /* I counts args in order (to be) pushed; ARGPOS counts in order written. */
1010 for (p = actparms, argpos = 0; p; p = TREE_CHAIN (p), i += inc, argpos++)
1012 tree type = TREE_TYPE (TREE_VALUE (p));
1014 enum machine_mode mode;
1016 args[i].tree_value = TREE_VALUE (p);
1018 /* Replace erroneous argument with constant zero. */
1019 if (type == error_mark_node || TYPE_SIZE (type) == 0)
1020 args[i].tree_value = integer_zero_node, type = integer_type_node;
1022 /* If TYPE is a transparent union, pass things the way we would
1023 pass the first field of the union. We have already verified that
1024 the modes are the same. */
1025 if (TYPE_TRANSPARENT_UNION (type))
1026 type = TREE_TYPE (TYPE_FIELDS (type));
1028 /* Decide where to pass this arg.
1030 args[i].reg is nonzero if all or part is passed in registers.
1032 args[i].partial is nonzero if part but not all is passed in registers,
1033 and the exact value says how many words are passed in registers.
1035 args[i].pass_on_stack is nonzero if the argument must at least be
1036 computed on the stack. It may then be loaded back into registers
1037 if args[i].reg is nonzero.
1039 These decisions are driven by the FUNCTION_... macros and must agree
1040 with those made by function.c. */
1042 /* See if this argument should be passed by invisible reference. */
1043 if ((TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST
1044 && contains_placeholder_p (TYPE_SIZE (type)))
1045 || TREE_ADDRESSABLE (type)
1046 #ifdef FUNCTION_ARG_PASS_BY_REFERENCE
1047 || FUNCTION_ARG_PASS_BY_REFERENCE (args_so_far, TYPE_MODE (type),
1048 type, argpos < n_named_args)
1052 /* If we're compiling a thunk, pass through invisible
1053 references instead of making a copy. */
1054 if (current_function_is_thunk
1055 #ifdef FUNCTION_ARG_CALLEE_COPIES
1056 || (FUNCTION_ARG_CALLEE_COPIES (args_so_far, TYPE_MODE (type),
1057 type, argpos < n_named_args)
1058 /* If it's in a register, we must make a copy of it too. */
1059 /* ??? Is this a sufficient test? Is there a better one? */
1060 && !(TREE_CODE (args[i].tree_value) == VAR_DECL
1061 && REG_P (DECL_RTL (args[i].tree_value)))
1062 && ! TREE_ADDRESSABLE (type))
1066 args[i].tree_value = build1 (ADDR_EXPR,
1067 build_pointer_type (type),
1068 args[i].tree_value);
1069 type = build_pointer_type (type);
1073 /* We make a copy of the object and pass the address to the
1074 function being called. */
1077 if (TYPE_SIZE (type) == 0
1078 || TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST
1079 || (flag_stack_check && ! STACK_CHECK_BUILTIN
1080 && (TREE_INT_CST_HIGH (TYPE_SIZE (type)) != 0
1081 || (TREE_INT_CST_LOW (TYPE_SIZE (type))
1082 > STACK_CHECK_MAX_VAR_SIZE * BITS_PER_UNIT))))
1084 /* This is a variable-sized object. Make space on the stack
1086 rtx size_rtx = expr_size (TREE_VALUE (p));
1088 if (old_stack_level == 0)
1090 emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX);
1091 old_pending_adj = pending_stack_adjust;
1092 pending_stack_adjust = 0;
1095 copy = gen_rtx (MEM, BLKmode,
1096 allocate_dynamic_stack_space (size_rtx,
1098 TYPE_ALIGN (type)));
1102 int size = int_size_in_bytes (type);
1103 copy = assign_stack_temp (TYPE_MODE (type), size, 0);
1106 MEM_IN_STRUCT_P (copy) = AGGREGATE_TYPE_P (type);
1108 store_expr (args[i].tree_value, copy, 0);
1111 args[i].tree_value = build1 (ADDR_EXPR,
1112 build_pointer_type (type),
1113 make_tree (type, copy));
1114 type = build_pointer_type (type);
1118 mode = TYPE_MODE (type);
1119 unsignedp = TREE_UNSIGNED (type);
1121 #ifdef PROMOTE_FUNCTION_ARGS
1122 mode = promote_mode (type, mode, &unsignedp, 1);
1125 args[i].unsignedp = unsignedp;
1126 args[i].mode = mode;
1127 args[i].reg = FUNCTION_ARG (args_so_far, mode, type,
1128 argpos < n_named_args);
1129 #ifdef FUNCTION_ARG_PARTIAL_NREGS
1132 = FUNCTION_ARG_PARTIAL_NREGS (args_so_far, mode, type,
1133 argpos < n_named_args);
1136 args[i].pass_on_stack = MUST_PASS_IN_STACK (mode, type);
1138 /* If FUNCTION_ARG returned a (parallel [(expr_list (nil) ...) ...]),
1139 it means that we are to pass this arg in the register(s) designated
1140 by the PARALLEL, but also to pass it in the stack. */
1141 if (args[i].reg && GET_CODE (args[i].reg) == PARALLEL
1142 && XEXP (XVECEXP (args[i].reg, 0, 0), 0) == 0)
1143 args[i].pass_on_stack = 1;
1145 /* If this is an addressable type, we must preallocate the stack
1146 since we must evaluate the object into its final location.
1148 If this is to be passed in both registers and the stack, it is simpler
1150 if (TREE_ADDRESSABLE (type)
1151 || (args[i].pass_on_stack && args[i].reg != 0))
1152 must_preallocate = 1;
1154 /* If this is an addressable type, we cannot pre-evaluate it. Thus,
1155 we cannot consider this function call constant. */
1156 if (TREE_ADDRESSABLE (type))
1159 /* Compute the stack-size of this argument. */
1160 if (args[i].reg == 0 || args[i].partial != 0
1161 #ifdef REG_PARM_STACK_SPACE
1162 || reg_parm_stack_space > 0
1164 || args[i].pass_on_stack)
1165 locate_and_pad_parm (mode, type,
1166 #ifdef STACK_PARMS_IN_REG_PARM_AREA
1171 fndecl, &args_size, &args[i].offset,
1174 #ifndef ARGS_GROW_DOWNWARD
1175 args[i].slot_offset = args_size;
1178 #ifndef REG_PARM_STACK_SPACE
1179 /* If a part of the arg was put into registers,
1180 don't include that part in the amount pushed. */
1181 if (! args[i].pass_on_stack)
1182 args[i].size.constant -= ((args[i].partial * UNITS_PER_WORD)
1183 / (PARM_BOUNDARY / BITS_PER_UNIT)
1184 * (PARM_BOUNDARY / BITS_PER_UNIT));
1187 /* Update ARGS_SIZE, the total stack space for args so far. */
1189 args_size.constant += args[i].size.constant;
1190 if (args[i].size.var)
1192 ADD_PARM_SIZE (args_size, args[i].size.var);
1195 /* Since the slot offset points to the bottom of the slot,
1196 we must record it after incrementing if the args grow down. */
1197 #ifdef ARGS_GROW_DOWNWARD
1198 args[i].slot_offset = args_size;
1200 args[i].slot_offset.constant = -args_size.constant;
1203 SUB_PARM_SIZE (args[i].slot_offset, args_size.var);
1207 /* Increment ARGS_SO_FAR, which has info about which arg-registers
1208 have been used, etc. */
1210 FUNCTION_ARG_ADVANCE (args_so_far, TYPE_MODE (type), type,
1211 argpos < n_named_args);
1214 #ifdef FINAL_REG_PARM_STACK_SPACE
1215 reg_parm_stack_space = FINAL_REG_PARM_STACK_SPACE (args_size.constant,
1219 /* Compute the actual size of the argument block required. The variable
1220 and constant sizes must be combined, the size may have to be rounded,
1221 and there may be a minimum required size. */
1223 original_args_size = args_size;
1226 /* If this function requires a variable-sized argument list, don't try to
1227 make a cse'able block for this call. We may be able to do this
1228 eventually, but it is too complicated to keep track of what insns go
1229 in the cse'able block and which don't. */
1232 must_preallocate = 1;
1234 args_size.var = ARGS_SIZE_TREE (args_size);
1235 args_size.constant = 0;
1237 #ifdef STACK_BOUNDARY
1238 if (STACK_BOUNDARY != BITS_PER_UNIT)
1239 args_size.var = round_up (args_size.var, STACK_BYTES);
1242 #ifdef REG_PARM_STACK_SPACE
1243 if (reg_parm_stack_space > 0)
1246 = size_binop (MAX_EXPR, args_size.var,
1247 size_int (REG_PARM_STACK_SPACE (fndecl)));
1249 #ifndef OUTGOING_REG_PARM_STACK_SPACE
1250 /* The area corresponding to register parameters is not to count in
1251 the size of the block we need. So make the adjustment. */
1253 = size_binop (MINUS_EXPR, args_size.var,
1254 size_int (reg_parm_stack_space));
1261 #ifdef STACK_BOUNDARY
1262 args_size.constant = (((args_size.constant + (STACK_BYTES - 1))
1263 / STACK_BYTES) * STACK_BYTES);
1266 #ifdef REG_PARM_STACK_SPACE
1267 args_size.constant = MAX (args_size.constant,
1268 reg_parm_stack_space);
1269 #ifdef MAYBE_REG_PARM_STACK_SPACE
1270 if (reg_parm_stack_space == 0)
1271 args_size.constant = 0;
1273 #ifndef OUTGOING_REG_PARM_STACK_SPACE
1274 args_size.constant -= reg_parm_stack_space;
1279 /* See if we have or want to preallocate stack space.
1281 If we would have to push a partially-in-regs parm
1282 before other stack parms, preallocate stack space instead.
1284 If the size of some parm is not a multiple of the required stack
1285 alignment, we must preallocate.
1287 If the total size of arguments that would otherwise create a copy in
1288 a temporary (such as a CALL) is more than half the total argument list
1289 size, preallocation is faster.
1291 Another reason to preallocate is if we have a machine (like the m88k)
1292 where stack alignment is required to be maintained between every
1293 pair of insns, not just when the call is made. However, we assume here
1294 that such machines either do not have push insns (and hence preallocation
1295 would occur anyway) or the problem is taken care of with
1298 if (! must_preallocate)
1300 int partial_seen = 0;
1301 int copy_to_evaluate_size = 0;
1303 for (i = 0; i < num_actuals && ! must_preallocate; i++)
1305 if (args[i].partial > 0 && ! args[i].pass_on_stack)
1307 else if (partial_seen && args[i].reg == 0)
1308 must_preallocate = 1;
1310 if (TYPE_MODE (TREE_TYPE (args[i].tree_value)) == BLKmode
1311 && (TREE_CODE (args[i].tree_value) == CALL_EXPR
1312 || TREE_CODE (args[i].tree_value) == TARGET_EXPR
1313 || TREE_CODE (args[i].tree_value) == COND_EXPR
1314 || TREE_ADDRESSABLE (TREE_TYPE (args[i].tree_value))))
1315 copy_to_evaluate_size
1316 += int_size_in_bytes (TREE_TYPE (args[i].tree_value));
1319 if (copy_to_evaluate_size * 2 >= args_size.constant
1320 && args_size.constant > 0)
1321 must_preallocate = 1;
1324 /* If the structure value address will reference the stack pointer, we must
1325 stabilize it. We don't need to do this if we know that we are not going
1326 to adjust the stack pointer in processing this call. */
1328 if (structure_value_addr
1329 && (reg_mentioned_p (virtual_stack_dynamic_rtx, structure_value_addr)
1330 || reg_mentioned_p (virtual_outgoing_args_rtx, structure_value_addr))
1332 #ifndef ACCUMULATE_OUTGOING_ARGS
1333 || args_size.constant
1336 structure_value_addr = copy_to_reg (structure_value_addr);
1338 /* If this function call is cse'able, precompute all the parameters.
1339 Note that if the parameter is constructed into a temporary, this will
1340 cause an additional copy because the parameter will be constructed
1341 into a temporary location and then copied into the outgoing arguments.
1342 If a parameter contains a call to alloca and this function uses the
1343 stack, precompute the parameter. */
1345 /* If we preallocated the stack space, and some arguments must be passed
1346 on the stack, then we must precompute any parameter which contains a
1347 function call which will store arguments on the stack.
1348 Otherwise, evaluating the parameter may clobber previous parameters
1349 which have already been stored into the stack. */
1351 for (i = 0; i < num_actuals; i++)
1353 || ((args_size.var != 0 || args_size.constant != 0)
1354 && calls_function (args[i].tree_value, 1))
1355 || (must_preallocate && (args_size.var != 0 || args_size.constant != 0)
1356 && calls_function (args[i].tree_value, 0)))
1358 /* If this is an addressable type, we cannot pre-evaluate it. */
1359 if (TREE_ADDRESSABLE (TREE_TYPE (args[i].tree_value)))
1364 args[i].initial_value = args[i].value
1365 = expand_expr (args[i].tree_value, NULL_RTX, VOIDmode, 0);
1367 preserve_temp_slots (args[i].value);
1370 /* ANSI doesn't require a sequence point here,
1371 but PCC has one, so this will avoid some problems. */
1374 args[i].initial_value = args[i].value
1375 = protect_from_queue (args[i].initial_value, 0);
1377 if (TYPE_MODE (TREE_TYPE (args[i].tree_value)) != args[i].mode)
1379 = convert_modes (args[i].mode,
1380 TYPE_MODE (TREE_TYPE (args[i].tree_value)),
1381 args[i].value, args[i].unsignedp);
1384 /* Now we are about to start emitting insns that can be deleted
1385 if a libcall is deleted. */
1386 if (is_const || is_malloc)
1389 /* If we have no actual push instructions, or shouldn't use them,
1390 make space for all args right now. */
1392 if (args_size.var != 0)
1394 if (old_stack_level == 0)
1396 emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX);
1397 old_pending_adj = pending_stack_adjust;
1398 pending_stack_adjust = 0;
1399 #ifdef ACCUMULATE_OUTGOING_ARGS
1400 /* stack_arg_under_construction says whether a stack arg is
1401 being constructed at the old stack level. Pushing the stack
1402 gets a clean outgoing argument block. */
1403 old_stack_arg_under_construction = stack_arg_under_construction;
1404 stack_arg_under_construction = 0;
1407 argblock = push_block (ARGS_SIZE_RTX (args_size), 0, 0);
1411 /* Note that we must go through the motions of allocating an argument
1412 block even if the size is zero because we may be storing args
1413 in the area reserved for register arguments, which may be part of
1416 int needed = args_size.constant;
1418 /* Store the maximum argument space used. It will be pushed by
1419 the prologue (if ACCUMULATE_OUTGOING_ARGS, or stack overflow
1422 if (needed > current_function_outgoing_args_size)
1423 current_function_outgoing_args_size = needed;
1425 if (must_preallocate)
1427 #ifdef ACCUMULATE_OUTGOING_ARGS
1428 /* Since the stack pointer will never be pushed, it is possible for
1429 the evaluation of a parm to clobber something we have already
1430 written to the stack. Since most function calls on RISC machines
1431 do not use the stack, this is uncommon, but must work correctly.
1433 Therefore, we save any area of the stack that was already written
1434 and that we are using. Here we set up to do this by making a new
1435 stack usage map from the old one. The actual save will be done
1438 Another approach might be to try to reorder the argument
1439 evaluations to avoid this conflicting stack usage. */
1441 #if defined(REG_PARM_STACK_SPACE) && ! defined(OUTGOING_REG_PARM_STACK_SPACE)
1442 /* Since we will be writing into the entire argument area, the
1443 map must be allocated for its entire size, not just the part that
1444 is the responsibility of the caller. */
1445 needed += reg_parm_stack_space;
1448 #ifdef ARGS_GROW_DOWNWARD
1449 highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use,
1452 highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use,
1455 stack_usage_map = (char *) alloca (highest_outgoing_arg_in_use);
1457 if (initial_highest_arg_in_use)
1458 bcopy (initial_stack_usage_map, stack_usage_map,
1459 initial_highest_arg_in_use);
1461 if (initial_highest_arg_in_use != highest_outgoing_arg_in_use)
1462 bzero (&stack_usage_map[initial_highest_arg_in_use],
1463 highest_outgoing_arg_in_use - initial_highest_arg_in_use);
1466 /* The address of the outgoing argument list must not be copied to a
1467 register here, because argblock would be left pointing to the
1468 wrong place after the call to allocate_dynamic_stack_space below.
1471 argblock = virtual_outgoing_args_rtx;
1473 #else /* not ACCUMULATE_OUTGOING_ARGS */
1474 if (inhibit_defer_pop == 0)
1476 /* Try to reuse some or all of the pending_stack_adjust
1477 to get this space. Maybe we can avoid any pushing. */
1478 if (needed > pending_stack_adjust)
1480 needed -= pending_stack_adjust;
1481 pending_stack_adjust = 0;
1485 pending_stack_adjust -= needed;
1489 /* Special case this because overhead of `push_block' in this
1490 case is non-trivial. */
1492 argblock = virtual_outgoing_args_rtx;
1494 argblock = push_block (GEN_INT (needed), 0, 0);
1496 /* We only really need to call `copy_to_reg' in the case where push
1497 insns are going to be used to pass ARGBLOCK to a function
1498 call in ARGS. In that case, the stack pointer changes value
1499 from the allocation point to the call point, and hence
1500 the value of VIRTUAL_OUTGOING_ARGS_RTX changes as well.
1501 But might as well always do it. */
1502 argblock = copy_to_reg (argblock);
1503 #endif /* not ACCUMULATE_OUTGOING_ARGS */
1507 #ifdef ACCUMULATE_OUTGOING_ARGS
1508 /* The save/restore code in store_one_arg handles all cases except one:
1509 a constructor call (including a C function returning a BLKmode struct)
1510 to initialize an argument. */
1511 if (stack_arg_under_construction)
1513 #if defined(REG_PARM_STACK_SPACE) && ! defined(OUTGOING_REG_PARM_STACK_SPACE)
1514 rtx push_size = GEN_INT (reg_parm_stack_space + args_size.constant);
1516 rtx push_size = GEN_INT (args_size.constant);
1518 if (old_stack_level == 0)
1520 emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX);
1521 old_pending_adj = pending_stack_adjust;
1522 pending_stack_adjust = 0;
1523 /* stack_arg_under_construction says whether a stack arg is
1524 being constructed at the old stack level. Pushing the stack
1525 gets a clean outgoing argument block. */
1526 old_stack_arg_under_construction = stack_arg_under_construction;
1527 stack_arg_under_construction = 0;
1528 /* Make a new map for the new argument list. */
1529 stack_usage_map = (char *)alloca (highest_outgoing_arg_in_use);
1530 bzero (stack_usage_map, highest_outgoing_arg_in_use);
1531 highest_outgoing_arg_in_use = 0;
1533 allocate_dynamic_stack_space (push_size, NULL_RTX, BITS_PER_UNIT);
1535 /* If argument evaluation might modify the stack pointer, copy the
1536 address of the argument list to a register. */
1537 for (i = 0; i < num_actuals; i++)
1538 if (args[i].pass_on_stack)
1540 argblock = copy_addr_to_reg (argblock);
1546 /* If we preallocated stack space, compute the address of each argument.
1547 We need not ensure it is a valid memory address here; it will be
1548 validized when it is used. */
1551 rtx arg_reg = argblock;
1554 if (GET_CODE (argblock) == PLUS)
1555 arg_reg = XEXP (argblock, 0), arg_offset = INTVAL (XEXP (argblock, 1));
1557 for (i = 0; i < num_actuals; i++)
1559 rtx offset = ARGS_SIZE_RTX (args[i].offset);
1560 rtx slot_offset = ARGS_SIZE_RTX (args[i].slot_offset);
1563 /* Skip this parm if it will not be passed on the stack. */
1564 if (! args[i].pass_on_stack && args[i].reg != 0)
1567 if (GET_CODE (offset) == CONST_INT)
1568 addr = plus_constant (arg_reg, INTVAL (offset));
1570 addr = gen_rtx (PLUS, Pmode, arg_reg, offset);
1572 addr = plus_constant (addr, arg_offset);
1573 args[i].stack = gen_rtx (MEM, args[i].mode, addr);
1574 MEM_IN_STRUCT_P (args[i].stack)
1575 = AGGREGATE_TYPE_P (TREE_TYPE (args[i].tree_value));
1577 if (GET_CODE (slot_offset) == CONST_INT)
1578 addr = plus_constant (arg_reg, INTVAL (slot_offset));
1580 addr = gen_rtx (PLUS, Pmode, arg_reg, slot_offset);
1582 addr = plus_constant (addr, arg_offset);
1583 args[i].stack_slot = gen_rtx (MEM, args[i].mode, addr);
1587 #ifdef PUSH_ARGS_REVERSED
1588 #ifdef STACK_BOUNDARY
1589 /* If we push args individually in reverse order, perform stack alignment
1590 before the first push (the last arg). */
1592 anti_adjust_stack (GEN_INT (args_size.constant
1593 - original_args_size.constant));
1597 /* Don't try to defer pops if preallocating, not even from the first arg,
1598 since ARGBLOCK probably refers to the SP. */
1602 /* Get the function to call, in the form of RTL. */
1605 /* If this is the first use of the function, see if we need to
1606 make an external definition for it. */
1607 if (! TREE_USED (fndecl))
1609 assemble_external (fndecl);
1610 TREE_USED (fndecl) = 1;
1613 /* Get a SYMBOL_REF rtx for the function address. */
1614 funexp = XEXP (DECL_RTL (fndecl), 0);
1617 /* Generate an rtx (probably a pseudo-register) for the address. */
1620 funexp = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, VOIDmode, 0);
1621 pop_temp_slots (); /* FUNEXP can't be BLKmode */
1623 /* Check the function is executable. */
1624 if (flag_check_memory_usage)
1625 emit_library_call (chkr_check_exec_libfunc, 1,
1631 /* Figure out the register where the value, if any, will come back. */
1633 if (TYPE_MODE (TREE_TYPE (exp)) != VOIDmode
1634 && ! structure_value_addr)
1636 if (pcc_struct_value)
1637 valreg = hard_function_value (build_pointer_type (TREE_TYPE (exp)),
1640 valreg = hard_function_value (TREE_TYPE (exp), fndecl);
1643 /* Precompute all register parameters. It isn't safe to compute anything
1644 once we have started filling any specific hard regs. */
1646 for (i = 0; i < num_actuals; i++)
1647 if (args[i].reg != 0 && ! args[i].pass_on_stack)
1651 if (args[i].value == 0)
1654 args[i].value = expand_expr (args[i].tree_value, NULL_RTX,
1656 preserve_temp_slots (args[i].value);
1659 /* ANSI doesn't require a sequence point here,
1660 but PCC has one, so this will avoid some problems. */
1664 /* If we are to promote the function arg to a wider mode,
1667 if (args[i].mode != TYPE_MODE (TREE_TYPE (args[i].tree_value)))
1669 = convert_modes (args[i].mode,
1670 TYPE_MODE (TREE_TYPE (args[i].tree_value)),
1671 args[i].value, args[i].unsignedp);
1673 /* If the value is expensive, and we are inside an appropriately
1674 short loop, put the value into a pseudo and then put the pseudo
1677 For small register classes, also do this if this call uses
1678 register parameters. This is to avoid reload conflicts while
1679 loading the parameters registers. */
1681 if ((! (GET_CODE (args[i].value) == REG
1682 || (GET_CODE (args[i].value) == SUBREG
1683 && GET_CODE (SUBREG_REG (args[i].value)) == REG)))
1684 && args[i].mode != BLKmode
1685 && rtx_cost (args[i].value, SET) > 2
1686 && ((SMALL_REGISTER_CLASSES && reg_parm_seen)
1687 || preserve_subexpressions_p ()))
1688 args[i].value = copy_to_mode_reg (args[i].mode, args[i].value);
1691 #if defined(ACCUMULATE_OUTGOING_ARGS) && defined(REG_PARM_STACK_SPACE)
1692 /* The argument list is the property of the called routine and it
1693 may clobber it. If the fixed area has been used for previous
1694 parameters, we must save and restore it.
1696 Here we compute the boundary of the that needs to be saved, if any. */
1698 #ifdef ARGS_GROW_DOWNWARD
1699 for (i = 0; i < reg_parm_stack_space + 1; i++)
1701 for (i = 0; i < reg_parm_stack_space; i++)
1704 if (i >= highest_outgoing_arg_in_use
1705 || stack_usage_map[i] == 0)
1708 if (low_to_save == -1)
1714 if (low_to_save >= 0)
1716 int num_to_save = high_to_save - low_to_save + 1;
1717 enum machine_mode save_mode
1718 = mode_for_size (num_to_save * BITS_PER_UNIT, MODE_INT, 1);
1721 /* If we don't have the required alignment, must do this in BLKmode. */
1722 if ((low_to_save & (MIN (GET_MODE_SIZE (save_mode),
1723 BIGGEST_ALIGNMENT / UNITS_PER_WORD) - 1)))
1724 save_mode = BLKmode;
1726 stack_area = gen_rtx (MEM, save_mode,
1727 memory_address (save_mode,
1729 #ifdef ARGS_GROW_DOWNWARD
1730 plus_constant (argblock,
1733 plus_constant (argblock,
1737 if (save_mode == BLKmode)
1739 save_area = assign_stack_temp (BLKmode, num_to_save, 0);
1740 MEM_IN_STRUCT_P (save_area) = 0;
1741 emit_block_move (validize_mem (save_area), stack_area,
1742 GEN_INT (num_to_save),
1743 PARM_BOUNDARY / BITS_PER_UNIT);
1747 save_area = gen_reg_rtx (save_mode);
1748 emit_move_insn (save_area, stack_area);
1754 /* Now store (and compute if necessary) all non-register parms.
1755 These come before register parms, since they can require block-moves,
1756 which could clobber the registers used for register parms.
1757 Parms which have partial registers are not stored here,
1758 but we do preallocate space here if they want that. */
1760 for (i = 0; i < num_actuals; i++)
1761 if (args[i].reg == 0 || args[i].pass_on_stack)
1762 store_one_arg (&args[i], argblock, may_be_alloca,
1763 args_size.var != 0, fndecl, reg_parm_stack_space);
1765 /* If we have a parm that is passed in registers but not in memory
1766 and whose alignment does not permit a direct copy into registers,
1767 make a group of pseudos that correspond to each register that we
1770 if (STRICT_ALIGNMENT)
1771 for (i = 0; i < num_actuals; i++)
1772 if (args[i].reg != 0 && ! args[i].pass_on_stack
1773 && args[i].mode == BLKmode
1774 && (TYPE_ALIGN (TREE_TYPE (args[i].tree_value))
1775 < MIN (BIGGEST_ALIGNMENT, BITS_PER_WORD)))
1777 int bytes = int_size_in_bytes (TREE_TYPE (args[i].tree_value));
1778 int big_endian_correction = 0;
1780 args[i].n_aligned_regs
1781 = args[i].partial ? args[i].partial
1782 : (bytes + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD;
1784 args[i].aligned_regs = (rtx *) alloca (sizeof (rtx)
1785 * args[i].n_aligned_regs);
1787 /* Structures smaller than a word are aligned to the least
1788 significant byte (to the right). On a BYTES_BIG_ENDIAN machine,
1789 this means we must skip the empty high order bytes when
1790 calculating the bit offset. */
1791 if (BYTES_BIG_ENDIAN && bytes < UNITS_PER_WORD)
1792 big_endian_correction = (BITS_PER_WORD - (bytes * BITS_PER_UNIT));
1794 for (j = 0; j < args[i].n_aligned_regs; j++)
1796 rtx reg = gen_reg_rtx (word_mode);
1797 rtx word = operand_subword_force (args[i].value, j, BLKmode);
1798 int bitsize = TYPE_ALIGN (TREE_TYPE (args[i].tree_value));
1801 args[i].aligned_regs[j] = reg;
1803 /* Clobber REG and move each partword into it. Ensure we don't
1804 go past the end of the structure. Note that the loop below
1805 works because we've already verified that padding
1806 and endianness are compatible.
1808 We use to emit a clobber here but that doesn't let later
1809 passes optimize the instructions we emit. By storing 0 into
1810 the register later passes know the first AND to zero out the
1811 bitfield being set in the register is unnecessary. The store
1812 of 0 will be deleted as will at least the first AND. */
1814 emit_move_insn (reg, const0_rtx);
1817 bitpos < BITS_PER_WORD && bytes > 0;
1818 bitpos += bitsize, bytes -= bitsize / BITS_PER_UNIT)
1820 int xbitpos = bitpos + big_endian_correction;
1822 store_bit_field (reg, bitsize, xbitpos, word_mode,
1823 extract_bit_field (word, bitsize, bitpos, 1,
1824 NULL_RTX, word_mode,
1826 bitsize / BITS_PER_UNIT,
1828 bitsize / BITS_PER_UNIT, BITS_PER_WORD);
1833 /* Now store any partially-in-registers parm.
1834 This is the last place a block-move can happen. */
1836 for (i = 0; i < num_actuals; i++)
1837 if (args[i].partial != 0 && ! args[i].pass_on_stack)
1838 store_one_arg (&args[i], argblock, may_be_alloca,
1839 args_size.var != 0, fndecl, reg_parm_stack_space);
1841 #ifndef PUSH_ARGS_REVERSED
1842 #ifdef STACK_BOUNDARY
1843 /* If we pushed args in forward order, perform stack alignment
1844 after pushing the last arg. */
1846 anti_adjust_stack (GEN_INT (args_size.constant
1847 - original_args_size.constant));
1851 /* If register arguments require space on the stack and stack space
1852 was not preallocated, allocate stack space here for arguments
1853 passed in registers. */
1854 #if ! defined(ACCUMULATE_OUTGOING_ARGS) && defined(OUTGOING_REG_PARM_STACK_SPACE)
1855 if (must_preallocate == 0 && reg_parm_stack_space > 0)
1856 anti_adjust_stack (GEN_INT (reg_parm_stack_space));
1859 /* Pass the function the address in which to return a structure value. */
1860 if (structure_value_addr && ! structure_value_addr_parm)
1862 emit_move_insn (struct_value_rtx,
1864 force_operand (structure_value_addr,
1867 /* Mark the memory for the aggregate as write-only. */
1868 if (flag_check_memory_usage)
1869 emit_library_call (chkr_set_right_libfunc, 1,
1871 structure_value_addr, ptr_mode,
1872 GEN_INT (struct_value_size), TYPE_MODE (sizetype),
1873 GEN_INT (MEMORY_USE_WO),
1874 TYPE_MODE (integer_type_node));
1876 if (GET_CODE (struct_value_rtx) == REG)
1877 use_reg (&call_fusage, struct_value_rtx);
1880 funexp = prepare_call_address (funexp, fndecl, &call_fusage, reg_parm_seen);
1882 /* Now do the register loads required for any wholly-register parms or any
1883 parms which are passed both on the stack and in a register. Their
1884 expressions were already evaluated.
1886 Mark all register-parms as living through the call, putting these USE
1887 insns in the CALL_INSN_FUNCTION_USAGE field. */
1889 #ifdef LOAD_ARGS_REVERSED
1890 for (i = num_actuals - 1; i >= 0; i--)
1892 for (i = 0; i < num_actuals; i++)
1895 rtx reg = args[i].reg;
1896 int partial = args[i].partial;
1901 /* Set to non-negative if must move a word at a time, even if just
1902 one word (e.g, partial == 1 && mode == DFmode). Set to -1 if
1903 we just use a normal move insn. This value can be zero if the
1904 argument is a zero size structure with no fields. */
1905 nregs = (partial ? partial
1906 : (TYPE_MODE (TREE_TYPE (args[i].tree_value)) == BLKmode
1907 ? ((int_size_in_bytes (TREE_TYPE (args[i].tree_value))
1908 + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD)
1911 /* Handle calls that pass values in multiple non-contiguous
1912 locations. The Irix 6 ABI has examples of this. */
1914 if (GET_CODE (reg) == PARALLEL)
1915 emit_group_load (reg, args[i].value);
1917 /* If simple case, just do move. If normal partial, store_one_arg
1918 has already loaded the register for us. In all other cases,
1919 load the register(s) from memory. */
1921 else if (nregs == -1)
1922 emit_move_insn (reg, args[i].value);
1924 /* If we have pre-computed the values to put in the registers in
1925 the case of non-aligned structures, copy them in now. */
1927 else if (args[i].n_aligned_regs != 0)
1928 for (j = 0; j < args[i].n_aligned_regs; j++)
1929 emit_move_insn (gen_rtx (REG, word_mode, REGNO (reg) + j),
1930 args[i].aligned_regs[j]);
1932 else if (partial == 0 || args[i].pass_on_stack)
1933 move_block_to_reg (REGNO (reg),
1934 validize_mem (args[i].value), nregs,
1937 /* Handle calls that pass values in multiple non-contiguous
1938 locations. The Irix 6 ABI has examples of this. */
1939 if (GET_CODE (reg) == PARALLEL)
1940 use_group_regs (&call_fusage, reg);
1941 else if (nregs == -1)
1942 use_reg (&call_fusage, reg);
1944 use_regs (&call_fusage, REGNO (reg), nregs == 0 ? 1 : nregs);
1948 /* Perform postincrements before actually calling the function. */
1951 /* All arguments and registers used for the call must be set up by now! */
1953 /* Generate the actual call instruction. */
1954 emit_call_1 (funexp, fndecl, funtype, args_size.constant, struct_value_size,
1955 FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1),
1956 valreg, old_inhibit_defer_pop, call_fusage, is_const);
1958 /* If call is cse'able, make appropriate pair of reg-notes around it.
1959 Test valreg so we don't crash; may safely ignore `const'
1960 if return type is void. Disable for PARALLEL return values, because
1961 we have no way to move such values into a pseudo register. */
1962 if (is_const && valreg != 0 && GET_CODE (valreg) != PARALLEL)
1965 rtx temp = gen_reg_rtx (GET_MODE (valreg));
1968 /* Mark the return value as a pointer if needed. */
1969 if (TREE_CODE (TREE_TYPE (exp)) == POINTER_TYPE)
1971 tree pointed_to = TREE_TYPE (TREE_TYPE (exp));
1972 mark_reg_pointer (temp, TYPE_ALIGN (pointed_to) / BITS_PER_UNIT);
1975 /* Construct an "equal form" for the value which mentions all the
1976 arguments in order as well as the function name. */
1977 #ifdef PUSH_ARGS_REVERSED
1978 for (i = 0; i < num_actuals; i++)
1979 note = gen_rtx (EXPR_LIST, VOIDmode, args[i].initial_value, note);
1981 for (i = num_actuals - 1; i >= 0; i--)
1982 note = gen_rtx (EXPR_LIST, VOIDmode, args[i].initial_value, note);
1984 note = gen_rtx (EXPR_LIST, VOIDmode, funexp, note);
1986 insns = get_insns ();
1989 emit_libcall_block (insns, temp, valreg, note);
1995 /* Otherwise, just write out the sequence without a note. */
1996 rtx insns = get_insns ();
2003 rtx temp = gen_reg_rtx (GET_MODE (valreg));
2006 /* The return value from a malloc-like function is a pointer. */
2007 if (TREE_CODE (TREE_TYPE (exp)) == POINTER_TYPE)
2008 mark_reg_pointer (temp, BIGGEST_ALIGNMENT / BITS_PER_UNIT);
2010 emit_move_insn (temp, valreg);
2012 /* The return value from a malloc-like function can not alias
2014 last = get_last_insn ();
2016 gen_rtx (EXPR_LIST, REG_NOALIAS, temp, REG_NOTES (last));
2018 /* Write out the sequence. */
2019 insns = get_insns ();
2025 /* For calls to `setjmp', etc., inform flow.c it should complain
2026 if nonvolatile values are live. */
2030 emit_note (name, NOTE_INSN_SETJMP);
2031 current_function_calls_setjmp = 1;
2035 current_function_calls_longjmp = 1;
2037 /* Notice functions that cannot return.
2038 If optimizing, insns emitted below will be dead.
2039 If not optimizing, they will exist, which is useful
2040 if the user uses the `return' command in the debugger. */
2042 if (is_volatile || is_longjmp)
2045 /* If value type not void, return an rtx for the value. */
2047 /* If there are cleanups to be called, don't use a hard reg as target.
2048 We need to double check this and see if it matters anymore. */
2049 if (any_pending_cleanups (1)
2050 && target && REG_P (target)
2051 && REGNO (target) < FIRST_PSEUDO_REGISTER)
2054 if (TYPE_MODE (TREE_TYPE (exp)) == VOIDmode
2057 target = const0_rtx;
2059 else if (structure_value_addr)
2061 if (target == 0 || GET_CODE (target) != MEM)
2063 target = gen_rtx (MEM, TYPE_MODE (TREE_TYPE (exp)),
2064 memory_address (TYPE_MODE (TREE_TYPE (exp)),
2065 structure_value_addr));
2066 MEM_IN_STRUCT_P (target) = AGGREGATE_TYPE_P (TREE_TYPE (exp));
2069 else if (pcc_struct_value)
2071 /* This is the special C++ case where we need to
2072 know what the true target was. We take care to
2073 never use this value more than once in one expression. */
2074 target = gen_rtx (MEM, TYPE_MODE (TREE_TYPE (exp)),
2075 copy_to_reg (valreg));
2076 MEM_IN_STRUCT_P (target) = AGGREGATE_TYPE_P (TREE_TYPE (exp));
2078 /* Handle calls that return values in multiple non-contiguous locations.
2079 The Irix 6 ABI has examples of this. */
2080 else if (GET_CODE (valreg) == PARALLEL)
2084 int bytes = int_size_in_bytes (TREE_TYPE (exp));
2085 target = assign_stack_temp (TYPE_MODE (TREE_TYPE (exp)), bytes, 0);
2086 MEM_IN_STRUCT_P (target) = AGGREGATE_TYPE_P (TREE_TYPE (exp));
2087 preserve_temp_slots (target);
2090 emit_group_store (target, valreg);
2092 else if (target && GET_MODE (target) == TYPE_MODE (TREE_TYPE (exp))
2093 && GET_MODE (target) == GET_MODE (valreg))
2094 /* TARGET and VALREG cannot be equal at this point because the latter
2095 would not have REG_FUNCTION_VALUE_P true, while the former would if
2096 it were referring to the same register.
2098 If they refer to the same register, this move will be a no-op, except
2099 when function inlining is being done. */
2100 emit_move_insn (target, valreg);
2101 else if (TYPE_MODE (TREE_TYPE (exp)) == BLKmode)
2103 /* Some machines (the PA for example) want to return all small
2104 structures in registers regardless of the structure's alignment.
2106 Deal with them explicitly by copying from the return registers
2107 into the target MEM locations. */
2108 int bytes = int_size_in_bytes (TREE_TYPE (exp));
2109 int n_regs = (bytes + UNITS_PER_WORD - 1) / UNITS_PER_WORD;
2111 enum machine_mode tmpmode;
2113 int bitsize = MIN (TYPE_ALIGN (TREE_TYPE (exp)), BITS_PER_WORD);
2114 int bitpos, xbitpos, big_endian_correction = 0;
2118 target = assign_stack_temp (BLKmode, bytes, 0);
2119 MEM_IN_STRUCT_P (target) = AGGREGATE_TYPE_P (TREE_TYPE (exp));
2120 preserve_temp_slots (target);
2123 /* This code assumes valreg is at least a full word. If it isn't,
2124 copy it into a new pseudo which is a full word. */
2125 if (GET_MODE (valreg) != BLKmode
2126 && GET_MODE_SIZE (GET_MODE (valreg)) < UNITS_PER_WORD)
2127 valreg = convert_to_mode (word_mode, valreg,
2128 TREE_UNSIGNED (TREE_TYPE (exp)));
2130 /* Structures whose size is not a multiple of a word are aligned
2131 to the least significant byte (to the right). On a BYTES_BIG_ENDIAN
2132 machine, this means we must skip the empty high order bytes when
2133 calculating the bit offset. */
2134 if (BYTES_BIG_ENDIAN && bytes % UNITS_PER_WORD)
2135 big_endian_correction = (BITS_PER_WORD - ((bytes % UNITS_PER_WORD)
2138 /* Copy the structure BITSIZE bites at a time.
2140 We could probably emit more efficient code for machines
2141 which do not use strict alignment, but it doesn't seem
2142 worth the effort at the current time. */
2143 for (bitpos = 0, xbitpos = big_endian_correction;
2144 bitpos < bytes * BITS_PER_UNIT;
2145 bitpos += bitsize, xbitpos += bitsize)
2148 /* We need a new source operand each time xbitpos is on a
2149 word boundary and when xbitpos == big_endian_correction
2150 (the first time through). */
2151 if (xbitpos % BITS_PER_WORD == 0
2152 || xbitpos == big_endian_correction)
2153 src = operand_subword_force (valreg,
2154 xbitpos / BITS_PER_WORD,
2157 /* We need a new destination operand each time bitpos is on
2159 if (bitpos % BITS_PER_WORD == 0)
2160 dst = operand_subword (target, bitpos / BITS_PER_WORD, 1, BLKmode);
2162 /* Use xbitpos for the source extraction (right justified) and
2163 xbitpos for the destination store (left justified). */
2164 store_bit_field (dst, bitsize, bitpos % BITS_PER_WORD, word_mode,
2165 extract_bit_field (src, bitsize,
2166 xbitpos % BITS_PER_WORD, 1,
2167 NULL_RTX, word_mode,
2169 bitsize / BITS_PER_UNIT,
2171 bitsize / BITS_PER_UNIT, BITS_PER_WORD);
2175 target = copy_to_reg (valreg);
2177 #ifdef PROMOTE_FUNCTION_RETURN
2178 /* If we promoted this return value, make the proper SUBREG. TARGET
2179 might be const0_rtx here, so be careful. */
2180 if (GET_CODE (target) == REG
2181 && TYPE_MODE (TREE_TYPE (exp)) != BLKmode
2182 && GET_MODE (target) != TYPE_MODE (TREE_TYPE (exp)))
2184 tree type = TREE_TYPE (exp);
2185 int unsignedp = TREE_UNSIGNED (type);
2187 /* If we don't promote as expected, something is wrong. */
2188 if (GET_MODE (target)
2189 != promote_mode (type, TYPE_MODE (type), &unsignedp, 1))
2192 target = gen_rtx (SUBREG, TYPE_MODE (type), target, 0);
2193 SUBREG_PROMOTED_VAR_P (target) = 1;
2194 SUBREG_PROMOTED_UNSIGNED_P (target) = unsignedp;
2198 /* If size of args is variable or this was a constructor call for a stack
2199 argument, restore saved stack-pointer value. */
2201 if (old_stack_level)
2203 emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX);
2204 pending_stack_adjust = old_pending_adj;
2205 #ifdef ACCUMULATE_OUTGOING_ARGS
2206 stack_arg_under_construction = old_stack_arg_under_construction;
2207 highest_outgoing_arg_in_use = initial_highest_arg_in_use;
2208 stack_usage_map = initial_stack_usage_map;
2211 #ifdef ACCUMULATE_OUTGOING_ARGS
2214 #ifdef REG_PARM_STACK_SPACE
2217 enum machine_mode save_mode = GET_MODE (save_area);
2219 = gen_rtx (MEM, save_mode,
2220 memory_address (save_mode,
2221 #ifdef ARGS_GROW_DOWNWARD
2222 plus_constant (argblock, - high_to_save)
2224 plus_constant (argblock, low_to_save)
2228 if (save_mode != BLKmode)
2229 emit_move_insn (stack_area, save_area);
2231 emit_block_move (stack_area, validize_mem (save_area),
2232 GEN_INT (high_to_save - low_to_save + 1),
2233 PARM_BOUNDARY / BITS_PER_UNIT);
2237 /* If we saved any argument areas, restore them. */
2238 for (i = 0; i < num_actuals; i++)
2239 if (args[i].save_area)
2241 enum machine_mode save_mode = GET_MODE (args[i].save_area);
2243 = gen_rtx (MEM, save_mode,
2244 memory_address (save_mode,
2245 XEXP (args[i].stack_slot, 0)));
2247 if (save_mode != BLKmode)
2248 emit_move_insn (stack_area, args[i].save_area);
2250 emit_block_move (stack_area, validize_mem (args[i].save_area),
2251 GEN_INT (args[i].size.constant),
2252 PARM_BOUNDARY / BITS_PER_UNIT);
2255 highest_outgoing_arg_in_use = initial_highest_arg_in_use;
2256 stack_usage_map = initial_stack_usage_map;
2260 /* If this was alloca, record the new stack level for nonlocal gotos.
2261 Check for the handler slots since we might not have a save area
2262 for non-local gotos. */
2264 if (may_be_alloca && nonlocal_goto_handler_slot != 0)
2265 emit_stack_save (SAVE_NONLOCAL, &nonlocal_goto_stack_level, NULL_RTX);
2272 /* Output a library call to function FUN (a SYMBOL_REF rtx)
2273 (emitting the queue unless NO_QUEUE is nonzero),
2274 for a value of mode OUTMODE,
2275 with NARGS different arguments, passed as alternating rtx values
2276 and machine_modes to convert them to.
2277 The rtx values should have been passed through protect_from_queue already.
2279 NO_QUEUE will be true if and only if the library call is a `const' call
2280 which will be enclosed in REG_LIBCALL/REG_RETVAL notes; it is equivalent
2281 to the variable is_const in expand_call.
2283 NO_QUEUE must be true for const calls, because if it isn't, then
2284 any pending increment will be emitted between REG_LIBCALL/REG_RETVAL notes,
2285 and will be lost if the libcall sequence is optimized away.
2287 NO_QUEUE must be false for non-const calls, because if it isn't, the
2288 call insn will have its CONST_CALL_P bit set, and it will be incorrectly
2289 optimized. For instance, the instruction scheduler may incorrectly
2290 move memory references across the non-const call. */
2293 emit_library_call VPROTO((rtx orgfun, int no_queue, enum machine_mode outmode,
2299 enum machine_mode outmode;
2303 /* Total size in bytes of all the stack-parms scanned so far. */
2304 struct args_size args_size;
2305 /* Size of arguments before any adjustments (such as rounding). */
2306 struct args_size original_args_size;
2307 register int argnum;
2312 CUMULATIVE_ARGS args_so_far;
2313 struct arg { rtx value; enum machine_mode mode; rtx reg; int partial;
2314 struct args_size offset; struct args_size size; rtx save_area; };
2316 int old_inhibit_defer_pop = inhibit_defer_pop;
2317 rtx call_fusage = 0;
2318 /* Size of the stack reserved for parameter registers. */
2319 int reg_parm_stack_space = 0;
2320 #if defined(ACCUMULATE_OUTGOING_ARGS) && defined(REG_PARM_STACK_SPACE)
2321 /* Define the boundary of the register parm stack space that needs to be
2323 int low_to_save = -1, high_to_save;
2324 rtx save_area = 0; /* Place that it is saved */
2327 #ifdef ACCUMULATE_OUTGOING_ARGS
2328 int initial_highest_arg_in_use = highest_outgoing_arg_in_use;
2329 char *initial_stack_usage_map = stack_usage_map;
2333 #ifdef REG_PARM_STACK_SPACE
2334 #ifdef MAYBE_REG_PARM_STACK_SPACE
2335 reg_parm_stack_space = MAYBE_REG_PARM_STACK_SPACE;
2337 reg_parm_stack_space = REG_PARM_STACK_SPACE (fndecl);
2341 VA_START (p, nargs);
2344 orgfun = va_arg (p, rtx);
2345 no_queue = va_arg (p, int);
2346 outmode = va_arg (p, enum machine_mode);
2347 nargs = va_arg (p, int);
2352 /* Copy all the libcall-arguments out of the varargs data
2353 and into a vector ARGVEC.
2355 Compute how to pass each argument. We only support a very small subset
2356 of the full argument passing conventions to limit complexity here since
2357 library functions shouldn't have many args. */
2359 argvec = (struct arg *) alloca (nargs * sizeof (struct arg));
2360 bzero ((char *) argvec, nargs * sizeof (struct arg));
2363 INIT_CUMULATIVE_ARGS (args_so_far, NULL_TREE, fun, 0);
2365 args_size.constant = 0;
2370 for (count = 0; count < nargs; count++)
2372 rtx val = va_arg (p, rtx);
2373 enum machine_mode mode = va_arg (p, enum machine_mode);
2375 /* We cannot convert the arg value to the mode the library wants here;
2376 must do it earlier where we know the signedness of the arg. */
2378 || (GET_MODE (val) != mode && GET_MODE (val) != VOIDmode))
2381 /* On some machines, there's no way to pass a float to a library fcn.
2382 Pass it as a double instead. */
2383 #ifdef LIBGCC_NEEDS_DOUBLE
2384 if (LIBGCC_NEEDS_DOUBLE && mode == SFmode)
2385 val = convert_modes (DFmode, SFmode, val, 0), mode = DFmode;
2388 /* There's no need to call protect_from_queue, because
2389 either emit_move_insn or emit_push_insn will do that. */
2391 /* Make sure it is a reasonable operand for a move or push insn. */
2392 if (GET_CODE (val) != REG && GET_CODE (val) != MEM
2393 && ! (CONSTANT_P (val) && LEGITIMATE_CONSTANT_P (val)))
2394 val = force_operand (val, NULL_RTX);
2396 #ifdef FUNCTION_ARG_PASS_BY_REFERENCE
2397 if (FUNCTION_ARG_PASS_BY_REFERENCE (args_so_far, mode, NULL_TREE, 1))
2399 /* We do not support FUNCTION_ARG_CALLEE_COPIES here since it can
2400 be viewed as just an efficiency improvement. */
2401 rtx slot = assign_stack_temp (mode, GET_MODE_SIZE (mode), 0);
2402 emit_move_insn (slot, val);
2403 val = force_operand (XEXP (slot, 0), NULL_RTX);
2408 argvec[count].value = val;
2409 argvec[count].mode = mode;
2411 argvec[count].reg = FUNCTION_ARG (args_so_far, mode, NULL_TREE, 1);
2412 if (argvec[count].reg && GET_CODE (argvec[count].reg) == PARALLEL)
2414 #ifdef FUNCTION_ARG_PARTIAL_NREGS
2415 argvec[count].partial
2416 = FUNCTION_ARG_PARTIAL_NREGS (args_so_far, mode, NULL_TREE, 1);
2418 argvec[count].partial = 0;
2421 locate_and_pad_parm (mode, NULL_TREE,
2422 argvec[count].reg && argvec[count].partial == 0,
2423 NULL_TREE, &args_size, &argvec[count].offset,
2424 &argvec[count].size);
2426 if (argvec[count].size.var)
2429 #ifndef REG_PARM_STACK_SPACE
2430 if (argvec[count].partial)
2431 argvec[count].size.constant -= argvec[count].partial * UNITS_PER_WORD;
2434 if (argvec[count].reg == 0 || argvec[count].partial != 0
2435 #ifdef REG_PARM_STACK_SPACE
2439 args_size.constant += argvec[count].size.constant;
2441 FUNCTION_ARG_ADVANCE (args_so_far, mode, (tree) 0, 1);
2445 #ifdef FINAL_REG_PARM_STACK_SPACE
2446 reg_parm_stack_space = FINAL_REG_PARM_STACK_SPACE (args_size.constant,
2450 /* If this machine requires an external definition for library
2451 functions, write one out. */
2452 assemble_external_libcall (fun);
2454 original_args_size = args_size;
2455 #ifdef STACK_BOUNDARY
2456 args_size.constant = (((args_size.constant + (STACK_BYTES - 1))
2457 / STACK_BYTES) * STACK_BYTES);
2460 #ifdef REG_PARM_STACK_SPACE
2461 args_size.constant = MAX (args_size.constant,
2462 reg_parm_stack_space);
2463 #ifndef OUTGOING_REG_PARM_STACK_SPACE
2464 args_size.constant -= reg_parm_stack_space;
2468 if (args_size.constant > current_function_outgoing_args_size)
2469 current_function_outgoing_args_size = args_size.constant;
2471 #ifdef ACCUMULATE_OUTGOING_ARGS
2472 /* Since the stack pointer will never be pushed, it is possible for
2473 the evaluation of a parm to clobber something we have already
2474 written to the stack. Since most function calls on RISC machines
2475 do not use the stack, this is uncommon, but must work correctly.
2477 Therefore, we save any area of the stack that was already written
2478 and that we are using. Here we set up to do this by making a new
2479 stack usage map from the old one.
2481 Another approach might be to try to reorder the argument
2482 evaluations to avoid this conflicting stack usage. */
2484 needed = args_size.constant;
2485 #if defined(REG_PARM_STACK_SPACE) && ! defined(OUTGOING_REG_PARM_STACK_SPACE)
2486 /* Since we will be writing into the entire argument area, the
2487 map must be allocated for its entire size, not just the part that
2488 is the responsibility of the caller. */
2489 needed += reg_parm_stack_space;
2492 #ifdef ARGS_GROW_DOWNWARD
2493 highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use,
2496 highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use,
2499 stack_usage_map = (char *) alloca (highest_outgoing_arg_in_use);
2501 if (initial_highest_arg_in_use)
2502 bcopy (initial_stack_usage_map, stack_usage_map,
2503 initial_highest_arg_in_use);
2505 if (initial_highest_arg_in_use != highest_outgoing_arg_in_use)
2506 bzero (&stack_usage_map[initial_highest_arg_in_use],
2507 highest_outgoing_arg_in_use - initial_highest_arg_in_use);
2510 /* The address of the outgoing argument list must not be copied to a
2511 register here, because argblock would be left pointing to the
2512 wrong place after the call to allocate_dynamic_stack_space below.
2515 argblock = virtual_outgoing_args_rtx;
2516 #else /* not ACCUMULATE_OUTGOING_ARGS */
2517 #ifndef PUSH_ROUNDING
2518 argblock = push_block (GEN_INT (args_size.constant), 0, 0);
2522 #ifdef PUSH_ARGS_REVERSED
2523 #ifdef STACK_BOUNDARY
2524 /* If we push args individually in reverse order, perform stack alignment
2525 before the first push (the last arg). */
2527 anti_adjust_stack (GEN_INT (args_size.constant
2528 - original_args_size.constant));
2532 #ifdef PUSH_ARGS_REVERSED
2540 #if defined(ACCUMULATE_OUTGOING_ARGS) && defined(REG_PARM_STACK_SPACE)
2541 /* The argument list is the property of the called routine and it
2542 may clobber it. If the fixed area has been used for previous
2543 parameters, we must save and restore it.
2545 Here we compute the boundary of the that needs to be saved, if any. */
2547 #ifdef ARGS_GROW_DOWNWARD
2548 for (count = 0; count < reg_parm_stack_space + 1; count++)
2550 for (count = 0; count < reg_parm_stack_space; count++)
2553 if (count >= highest_outgoing_arg_in_use
2554 || stack_usage_map[count] == 0)
2557 if (low_to_save == -1)
2558 low_to_save = count;
2560 high_to_save = count;
2563 if (low_to_save >= 0)
2565 int num_to_save = high_to_save - low_to_save + 1;
2566 enum machine_mode save_mode
2567 = mode_for_size (num_to_save * BITS_PER_UNIT, MODE_INT, 1);
2570 /* If we don't have the required alignment, must do this in BLKmode. */
2571 if ((low_to_save & (MIN (GET_MODE_SIZE (save_mode),
2572 BIGGEST_ALIGNMENT / UNITS_PER_WORD) - 1)))
2573 save_mode = BLKmode;
2575 stack_area = gen_rtx (MEM, save_mode,
2576 memory_address (save_mode,
2578 #ifdef ARGS_GROW_DOWNWARD
2579 plus_constant (argblock,
2582 plus_constant (argblock,
2586 if (save_mode == BLKmode)
2588 save_area = assign_stack_temp (BLKmode, num_to_save, 0);
2589 MEM_IN_STRUCT_P (save_area) = 0;
2590 emit_block_move (validize_mem (save_area), stack_area,
2591 GEN_INT (num_to_save),
2592 PARM_BOUNDARY / BITS_PER_UNIT);
2596 save_area = gen_reg_rtx (save_mode);
2597 emit_move_insn (save_area, stack_area);
2602 /* Push the args that need to be pushed. */
2604 /* ARGNUM indexes the ARGVEC array in the order in which the arguments
2605 are to be pushed. */
2606 for (count = 0; count < nargs; count++, argnum += inc)
2608 register enum machine_mode mode = argvec[argnum].mode;
2609 register rtx val = argvec[argnum].value;
2610 rtx reg = argvec[argnum].reg;
2611 int partial = argvec[argnum].partial;
2612 int lower_bound, upper_bound, i;
2614 if (! (reg != 0 && partial == 0))
2616 #ifdef ACCUMULATE_OUTGOING_ARGS
2617 /* If this is being stored into a pre-allocated, fixed-size, stack
2618 area, save any previous data at that location. */
2620 #ifdef ARGS_GROW_DOWNWARD
2621 /* stack_slot is negative, but we want to index stack_usage_map
2622 with positive values. */
2623 upper_bound = -argvec[argnum].offset.constant + 1;
2624 lower_bound = upper_bound - argvec[argnum].size.constant;
2626 lower_bound = argvec[argnum].offset.constant;
2627 upper_bound = lower_bound + argvec[argnum].size.constant;
2630 for (i = lower_bound; i < upper_bound; i++)
2631 if (stack_usage_map[i]
2632 #ifdef REG_PARM_STACK_SPACE
2633 /* Don't store things in the fixed argument area at this point;
2634 it has already been saved. */
2635 && i > reg_parm_stack_space
2640 if (i != upper_bound)
2642 /* We need to make a save area. See what mode we can make it. */
2643 enum machine_mode save_mode
2644 = mode_for_size (argvec[argnum].size.constant * BITS_PER_UNIT,
2647 = gen_rtx (MEM, save_mode,
2648 memory_address (save_mode, plus_constant (argblock,
2649 argvec[argnum].offset.constant)));
2650 argvec[argnum].save_area = gen_reg_rtx (save_mode);
2651 emit_move_insn (argvec[argnum].save_area, stack_area);
2654 emit_push_insn (val, mode, NULL_TREE, NULL_RTX, 0, partial, reg, 0,
2655 argblock, GEN_INT (argvec[argnum].offset.constant));
2657 #ifdef ACCUMULATE_OUTGOING_ARGS
2658 /* Now mark the segment we just used. */
2659 for (i = lower_bound; i < upper_bound; i++)
2660 stack_usage_map[i] = 1;
2667 #ifndef PUSH_ARGS_REVERSED
2668 #ifdef STACK_BOUNDARY
2669 /* If we pushed args in forward order, perform stack alignment
2670 after pushing the last arg. */
2672 anti_adjust_stack (GEN_INT (args_size.constant
2673 - original_args_size.constant));
2677 #ifdef PUSH_ARGS_REVERSED
2683 fun = prepare_call_address (fun, NULL_TREE, &call_fusage, 0);
2685 /* Now load any reg parms into their regs. */
2687 /* ARGNUM indexes the ARGVEC array in the order in which the arguments
2688 are to be pushed. */
2689 for (count = 0; count < nargs; count++, argnum += inc)
2691 register enum machine_mode mode = argvec[argnum].mode;
2692 register rtx val = argvec[argnum].value;
2693 rtx reg = argvec[argnum].reg;
2694 int partial = argvec[argnum].partial;
2696 if (reg != 0 && partial == 0)
2697 emit_move_insn (reg, val);
2701 /* For version 1.37, try deleting this entirely. */
2705 /* Any regs containing parms remain in use through the call. */
2706 for (count = 0; count < nargs; count++)
2707 if (argvec[count].reg != 0)
2708 use_reg (&call_fusage, argvec[count].reg);
2710 /* Don't allow popping to be deferred, since then
2711 cse'ing of library calls could delete a call and leave the pop. */
2714 /* We pass the old value of inhibit_defer_pop + 1 to emit_call_1, which
2715 will set inhibit_defer_pop to that value. */
2717 /* The return type is needed to decide how many bytes the function pops.
2718 Signedness plays no role in that, so for simplicity, we pretend it's
2719 always signed. We also assume that the list of arguments passed has
2720 no impact, so we pretend it is unknown. */
2723 get_identifier (XSTR (orgfun, 0)),
2724 build_function_type (outmode == VOIDmode ? void_type_node
2725 : type_for_mode (outmode, 0), NULL_TREE),
2726 args_size.constant, 0,
2727 FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1),
2728 outmode != VOIDmode ? hard_libcall_value (outmode) : NULL_RTX,
2729 old_inhibit_defer_pop + 1, call_fusage, no_queue);
2733 /* Now restore inhibit_defer_pop to its actual original value. */
2736 #ifdef ACCUMULATE_OUTGOING_ARGS
2737 #ifdef REG_PARM_STACK_SPACE
2740 enum machine_mode save_mode = GET_MODE (save_area);
2742 = gen_rtx (MEM, save_mode,
2743 memory_address (save_mode,
2744 #ifdef ARGS_GROW_DOWNWARD
2745 plus_constant (argblock, - high_to_save)
2747 plus_constant (argblock, low_to_save)
2751 if (save_mode != BLKmode)
2752 emit_move_insn (stack_area, save_area);
2754 emit_block_move (stack_area, validize_mem (save_area),
2755 GEN_INT (high_to_save - low_to_save + 1),
2756 PARM_BOUNDARY / BITS_PER_UNIT);
2760 /* If we saved any argument areas, restore them. */
2761 for (count = 0; count < nargs; count++)
2762 if (argvec[count].save_area)
2764 enum machine_mode save_mode = GET_MODE (argvec[count].save_area);
2766 = gen_rtx (MEM, save_mode,
2767 memory_address (save_mode, plus_constant (argblock,
2768 argvec[count].offset.constant)));
2770 emit_move_insn (stack_area, argvec[count].save_area);
2773 highest_outgoing_arg_in_use = initial_highest_arg_in_use;
2774 stack_usage_map = initial_stack_usage_map;
2778 /* Like emit_library_call except that an extra argument, VALUE,
2779 comes second and says where to store the result.
2780 (If VALUE is zero, this function chooses a convenient way
2781 to return the value.
2783 This function returns an rtx for where the value is to be found.
2784 If VALUE is nonzero, VALUE is returned. */
2787 emit_library_call_value VPROTO((rtx orgfun, rtx value, int no_queue,
2788 enum machine_mode outmode, int nargs, ...))
2794 enum machine_mode outmode;
2798 /* Total size in bytes of all the stack-parms scanned so far. */
2799 struct args_size args_size;
2800 /* Size of arguments before any adjustments (such as rounding). */
2801 struct args_size original_args_size;
2802 register int argnum;
2807 CUMULATIVE_ARGS args_so_far;
2808 struct arg { rtx value; enum machine_mode mode; rtx reg; int partial;
2809 struct args_size offset; struct args_size size; rtx save_area; };
2811 int old_inhibit_defer_pop = inhibit_defer_pop;
2812 rtx call_fusage = 0;
2813 /* Size of the stack reserved for parameter registers. */
2814 int reg_parm_stack_space = 0;
2816 int pcc_struct_value = 0;
2817 int struct_value_size = 0;
2821 #if defined(ACCUMULATE_OUTGOING_ARGS) && defined(REG_PARM_STACK_SPACE)
2822 /* Define the boundary of the register parm stack space that needs to be
2824 int low_to_save = -1, high_to_save;
2825 rtx save_area = 0; /* Place that it is saved */
2828 #ifdef ACCUMULATE_OUTGOING_ARGS
2829 int initial_highest_arg_in_use = highest_outgoing_arg_in_use;
2830 char *initial_stack_usage_map = stack_usage_map;
2833 #ifdef REG_PARM_STACK_SPACE
2834 #ifdef MAYBE_REG_PARM_STACK_SPACE
2835 reg_parm_stack_space = MAYBE_REG_PARM_STACK_SPACE;
2837 reg_parm_stack_space = REG_PARM_STACK_SPACE (fndecl);
2841 VA_START (p, nargs);
2844 orgfun = va_arg (p, rtx);
2845 value = va_arg (p, rtx);
2846 no_queue = va_arg (p, int);
2847 outmode = va_arg (p, enum machine_mode);
2848 nargs = va_arg (p, int);
2851 is_const = no_queue;
2854 /* If this kind of value comes back in memory,
2855 decide where in memory it should come back. */
2856 if (aggregate_value_p (type_for_mode (outmode, 0)))
2858 #ifdef PCC_STATIC_STRUCT_RETURN
2860 = hard_function_value (build_pointer_type (type_for_mode (outmode, 0)),
2862 mem_value = gen_rtx (MEM, outmode, pointer_reg);
2863 pcc_struct_value = 1;
2865 value = gen_reg_rtx (outmode);
2866 #else /* not PCC_STATIC_STRUCT_RETURN */
2867 struct_value_size = GET_MODE_SIZE (outmode);
2868 if (value != 0 && GET_CODE (value) == MEM)
2871 mem_value = assign_stack_temp (outmode, GET_MODE_SIZE (outmode), 0);
2874 /* This call returns a big structure. */
2878 /* ??? Unfinished: must pass the memory address as an argument. */
2880 /* Copy all the libcall-arguments out of the varargs data
2881 and into a vector ARGVEC.
2883 Compute how to pass each argument. We only support a very small subset
2884 of the full argument passing conventions to limit complexity here since
2885 library functions shouldn't have many args. */
2887 argvec = (struct arg *) alloca ((nargs + 1) * sizeof (struct arg));
2888 bzero ((char *) argvec, (nargs + 1) * sizeof (struct arg));
2890 INIT_CUMULATIVE_ARGS (args_so_far, NULL_TREE, fun, 0);
2892 args_size.constant = 0;
2899 /* If there's a structure value address to be passed,
2900 either pass it in the special place, or pass it as an extra argument. */
2901 if (mem_value && struct_value_rtx == 0 && ! pcc_struct_value)
2903 rtx addr = XEXP (mem_value, 0);
2906 /* Make sure it is a reasonable operand for a move or push insn. */
2907 if (GET_CODE (addr) != REG && GET_CODE (addr) != MEM
2908 && ! (CONSTANT_P (addr) && LEGITIMATE_CONSTANT_P (addr)))
2909 addr = force_operand (addr, NULL_RTX);
2911 argvec[count].value = addr;
2912 argvec[count].mode = Pmode;
2913 argvec[count].partial = 0;
2915 argvec[count].reg = FUNCTION_ARG (args_so_far, Pmode, NULL_TREE, 1);
2916 #ifdef FUNCTION_ARG_PARTIAL_NREGS
2917 if (FUNCTION_ARG_PARTIAL_NREGS (args_so_far, Pmode, NULL_TREE, 1))
2921 locate_and_pad_parm (Pmode, NULL_TREE,
2922 argvec[count].reg && argvec[count].partial == 0,
2923 NULL_TREE, &args_size, &argvec[count].offset,
2924 &argvec[count].size);
2927 if (argvec[count].reg == 0 || argvec[count].partial != 0
2928 #ifdef REG_PARM_STACK_SPACE
2932 args_size.constant += argvec[count].size.constant;
2934 FUNCTION_ARG_ADVANCE (args_so_far, Pmode, (tree) 0, 1);
2939 for (; count < nargs; count++)
2941 rtx val = va_arg (p, rtx);
2942 enum machine_mode mode = va_arg (p, enum machine_mode);
2944 /* We cannot convert the arg value to the mode the library wants here;
2945 must do it earlier where we know the signedness of the arg. */
2947 || (GET_MODE (val) != mode && GET_MODE (val) != VOIDmode))
2950 /* On some machines, there's no way to pass a float to a library fcn.
2951 Pass it as a double instead. */
2952 #ifdef LIBGCC_NEEDS_DOUBLE
2953 if (LIBGCC_NEEDS_DOUBLE && mode == SFmode)
2954 val = convert_modes (DFmode, SFmode, val, 0), mode = DFmode;
2957 /* There's no need to call protect_from_queue, because
2958 either emit_move_insn or emit_push_insn will do that. */
2960 /* Make sure it is a reasonable operand for a move or push insn. */
2961 if (GET_CODE (val) != REG && GET_CODE (val) != MEM
2962 && ! (CONSTANT_P (val) && LEGITIMATE_CONSTANT_P (val)))
2963 val = force_operand (val, NULL_RTX);
2965 #ifdef FUNCTION_ARG_PASS_BY_REFERENCE
2966 if (FUNCTION_ARG_PASS_BY_REFERENCE (args_so_far, mode, NULL_TREE, 1))
2968 /* We do not support FUNCTION_ARG_CALLEE_COPIES here since it can
2969 be viewed as just an efficiency improvement. */
2970 rtx slot = assign_stack_temp (mode, GET_MODE_SIZE (mode), 0);
2971 emit_move_insn (slot, val);
2972 val = XEXP (slot, 0);
2977 argvec[count].value = val;
2978 argvec[count].mode = mode;
2980 argvec[count].reg = FUNCTION_ARG (args_so_far, mode, NULL_TREE, 1);
2981 if (argvec[count].reg && GET_CODE (argvec[count].reg) == PARALLEL)
2983 #ifdef FUNCTION_ARG_PARTIAL_NREGS
2984 argvec[count].partial
2985 = FUNCTION_ARG_PARTIAL_NREGS (args_so_far, mode, NULL_TREE, 1);
2987 argvec[count].partial = 0;
2990 locate_and_pad_parm (mode, NULL_TREE,
2991 argvec[count].reg && argvec[count].partial == 0,
2992 NULL_TREE, &args_size, &argvec[count].offset,
2993 &argvec[count].size);
2995 if (argvec[count].size.var)
2998 #ifndef REG_PARM_STACK_SPACE
2999 if (argvec[count].partial)
3000 argvec[count].size.constant -= argvec[count].partial * UNITS_PER_WORD;
3003 if (argvec[count].reg == 0 || argvec[count].partial != 0
3004 #ifdef REG_PARM_STACK_SPACE
3008 args_size.constant += argvec[count].size.constant;
3010 FUNCTION_ARG_ADVANCE (args_so_far, mode, (tree) 0, 1);
3014 #ifdef FINAL_REG_PARM_STACK_SPACE
3015 reg_parm_stack_space = FINAL_REG_PARM_STACK_SPACE (args_size.constant,
3018 /* If this machine requires an external definition for library
3019 functions, write one out. */
3020 assemble_external_libcall (fun);
3022 original_args_size = args_size;
3023 #ifdef STACK_BOUNDARY
3024 args_size.constant = (((args_size.constant + (STACK_BYTES - 1))
3025 / STACK_BYTES) * STACK_BYTES);
3028 #ifdef REG_PARM_STACK_SPACE
3029 args_size.constant = MAX (args_size.constant,
3030 reg_parm_stack_space);
3031 #ifndef OUTGOING_REG_PARM_STACK_SPACE
3032 args_size.constant -= reg_parm_stack_space;
3036 if (args_size.constant > current_function_outgoing_args_size)
3037 current_function_outgoing_args_size = args_size.constant;
3039 #ifdef ACCUMULATE_OUTGOING_ARGS
3040 /* Since the stack pointer will never be pushed, it is possible for
3041 the evaluation of a parm to clobber something we have already
3042 written to the stack. Since most function calls on RISC machines
3043 do not use the stack, this is uncommon, but must work correctly.
3045 Therefore, we save any area of the stack that was already written
3046 and that we are using. Here we set up to do this by making a new
3047 stack usage map from the old one.
3049 Another approach might be to try to reorder the argument
3050 evaluations to avoid this conflicting stack usage. */
3052 needed = args_size.constant;
3053 #if defined(REG_PARM_STACK_SPACE) && ! defined(OUTGOING_REG_PARM_STACK_SPACE)
3054 /* Since we will be writing into the entire argument area, the
3055 map must be allocated for its entire size, not just the part that
3056 is the responsibility of the caller. */
3057 needed += reg_parm_stack_space;
3060 #ifdef ARGS_GROW_DOWNWARD
3061 highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use,
3064 highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use,
3067 stack_usage_map = (char *) alloca (highest_outgoing_arg_in_use);
3069 if (initial_highest_arg_in_use)
3070 bcopy (initial_stack_usage_map, stack_usage_map,
3071 initial_highest_arg_in_use);
3073 if (initial_highest_arg_in_use != highest_outgoing_arg_in_use)
3074 bzero (&stack_usage_map[initial_highest_arg_in_use],
3075 highest_outgoing_arg_in_use - initial_highest_arg_in_use);
3078 /* The address of the outgoing argument list must not be copied to a
3079 register here, because argblock would be left pointing to the
3080 wrong place after the call to allocate_dynamic_stack_space below.
3083 argblock = virtual_outgoing_args_rtx;
3084 #else /* not ACCUMULATE_OUTGOING_ARGS */
3085 #ifndef PUSH_ROUNDING
3086 argblock = push_block (GEN_INT (args_size.constant), 0, 0);
3090 #ifdef PUSH_ARGS_REVERSED
3091 #ifdef STACK_BOUNDARY
3092 /* If we push args individually in reverse order, perform stack alignment
3093 before the first push (the last arg). */
3095 anti_adjust_stack (GEN_INT (args_size.constant
3096 - original_args_size.constant));
3100 #ifdef PUSH_ARGS_REVERSED
3108 #if defined(ACCUMULATE_OUTGOING_ARGS) && defined(REG_PARM_STACK_SPACE)
3109 /* The argument list is the property of the called routine and it
3110 may clobber it. If the fixed area has been used for previous
3111 parameters, we must save and restore it.
3113 Here we compute the boundary of the that needs to be saved, if any. */
3115 #ifdef ARGS_GROW_DOWNWARD
3116 for (count = 0; count < reg_parm_stack_space + 1; count++)
3118 for (count = 0; count < reg_parm_stack_space; count++)
3121 if (count >= highest_outgoing_arg_in_use
3122 || stack_usage_map[count] == 0)
3125 if (low_to_save == -1)
3126 low_to_save = count;
3128 high_to_save = count;
3131 if (low_to_save >= 0)
3133 int num_to_save = high_to_save - low_to_save + 1;
3134 enum machine_mode save_mode
3135 = mode_for_size (num_to_save * BITS_PER_UNIT, MODE_INT, 1);
3138 /* If we don't have the required alignment, must do this in BLKmode. */
3139 if ((low_to_save & (MIN (GET_MODE_SIZE (save_mode),
3140 BIGGEST_ALIGNMENT / UNITS_PER_WORD) - 1)))
3141 save_mode = BLKmode;
3143 stack_area = gen_rtx (MEM, save_mode,
3144 memory_address (save_mode,
3146 #ifdef ARGS_GROW_DOWNWARD
3147 plus_constant (argblock,
3150 plus_constant (argblock,
3154 if (save_mode == BLKmode)
3156 save_area = assign_stack_temp (BLKmode, num_to_save, 0);
3157 MEM_IN_STRUCT_P (save_area) = 0;
3158 emit_block_move (validize_mem (save_area), stack_area,
3159 GEN_INT (num_to_save),
3160 PARM_BOUNDARY / BITS_PER_UNIT);
3164 save_area = gen_reg_rtx (save_mode);
3165 emit_move_insn (save_area, stack_area);
3170 /* Push the args that need to be pushed. */
3172 /* ARGNUM indexes the ARGVEC array in the order in which the arguments
3173 are to be pushed. */
3174 for (count = 0; count < nargs; count++, argnum += inc)
3176 register enum machine_mode mode = argvec[argnum].mode;
3177 register rtx val = argvec[argnum].value;
3178 rtx reg = argvec[argnum].reg;
3179 int partial = argvec[argnum].partial;
3180 int lower_bound, upper_bound, i;
3182 if (! (reg != 0 && partial == 0))
3184 #ifdef ACCUMULATE_OUTGOING_ARGS
3185 /* If this is being stored into a pre-allocated, fixed-size, stack
3186 area, save any previous data at that location. */
3188 #ifdef ARGS_GROW_DOWNWARD
3189 /* stack_slot is negative, but we want to index stack_usage_map
3190 with positive values. */
3191 upper_bound = -argvec[argnum].offset.constant + 1;
3192 lower_bound = upper_bound - argvec[argnum].size.constant;
3194 lower_bound = argvec[argnum].offset.constant;
3195 upper_bound = lower_bound + argvec[argnum].size.constant;
3198 for (i = lower_bound; i < upper_bound; i++)
3199 if (stack_usage_map[i]
3200 #ifdef REG_PARM_STACK_SPACE
3201 /* Don't store things in the fixed argument area at this point;
3202 it has already been saved. */
3203 && i > reg_parm_stack_space
3208 if (i != upper_bound)
3210 /* We need to make a save area. See what mode we can make it. */
3211 enum machine_mode save_mode
3212 = mode_for_size (argvec[argnum].size.constant * BITS_PER_UNIT,
3215 = gen_rtx (MEM, save_mode,
3216 memory_address (save_mode, plus_constant (argblock,
3217 argvec[argnum].offset.constant)));
3218 argvec[argnum].save_area = gen_reg_rtx (save_mode);
3219 emit_move_insn (argvec[argnum].save_area, stack_area);
3222 emit_push_insn (val, mode, NULL_TREE, NULL_RTX, 0, partial, reg, 0,
3223 argblock, GEN_INT (argvec[argnum].offset.constant));
3225 #ifdef ACCUMULATE_OUTGOING_ARGS
3226 /* Now mark the segment we just used. */
3227 for (i = lower_bound; i < upper_bound; i++)
3228 stack_usage_map[i] = 1;
3235 #ifndef PUSH_ARGS_REVERSED
3236 #ifdef STACK_BOUNDARY
3237 /* If we pushed args in forward order, perform stack alignment
3238 after pushing the last arg. */
3240 anti_adjust_stack (GEN_INT (args_size.constant
3241 - original_args_size.constant));
3245 #ifdef PUSH_ARGS_REVERSED
3251 fun = prepare_call_address (fun, NULL_TREE, &call_fusage, 0);
3253 /* Now load any reg parms into their regs. */
3255 /* ARGNUM indexes the ARGVEC array in the order in which the arguments
3256 are to be pushed. */
3257 for (count = 0; count < nargs; count++, argnum += inc)
3259 register enum machine_mode mode = argvec[argnum].mode;
3260 register rtx val = argvec[argnum].value;
3261 rtx reg = argvec[argnum].reg;
3262 int partial = argvec[argnum].partial;
3264 if (reg != 0 && partial == 0)
3265 emit_move_insn (reg, val);
3270 /* For version 1.37, try deleting this entirely. */
3275 /* Any regs containing parms remain in use through the call. */
3276 for (count = 0; count < nargs; count++)
3277 if (argvec[count].reg != 0)
3278 use_reg (&call_fusage, argvec[count].reg);
3280 /* Pass the function the address in which to return a structure value. */
3281 if (mem_value != 0 && struct_value_rtx != 0 && ! pcc_struct_value)
3283 emit_move_insn (struct_value_rtx,
3285 force_operand (XEXP (mem_value, 0),
3287 if (GET_CODE (struct_value_rtx) == REG)
3288 use_reg (&call_fusage, struct_value_rtx);
3291 /* Don't allow popping to be deferred, since then
3292 cse'ing of library calls could delete a call and leave the pop. */
3295 /* We pass the old value of inhibit_defer_pop + 1 to emit_call_1, which
3296 will set inhibit_defer_pop to that value. */
3297 /* See the comment in emit_library_call about the function type we build
3301 get_identifier (XSTR (orgfun, 0)),
3302 build_function_type (type_for_mode (outmode, 0), NULL_TREE),
3303 args_size.constant, struct_value_size,
3304 FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1),
3305 mem_value == 0 ? hard_libcall_value (outmode) : NULL_RTX,
3306 old_inhibit_defer_pop + 1, call_fusage, is_const);
3308 /* Now restore inhibit_defer_pop to its actual original value. */
3313 /* Copy the value to the right place. */
3314 if (outmode != VOIDmode)
3320 if (value != mem_value)
3321 emit_move_insn (value, mem_value);
3323 else if (value != 0)
3324 emit_move_insn (value, hard_libcall_value (outmode));
3326 value = hard_libcall_value (outmode);
3329 #ifdef ACCUMULATE_OUTGOING_ARGS
3330 #ifdef REG_PARM_STACK_SPACE
3333 enum machine_mode save_mode = GET_MODE (save_area);
3335 = gen_rtx (MEM, save_mode,
3336 memory_address (save_mode,
3337 #ifdef ARGS_GROW_DOWNWARD
3338 plus_constant (argblock, - high_to_save)
3340 plus_constant (argblock, low_to_save)
3344 if (save_mode != BLKmode)
3345 emit_move_insn (stack_area, save_area);
3347 emit_block_move (stack_area, validize_mem (save_area),
3348 GEN_INT (high_to_save - low_to_save + 1),
3349 PARM_BOUNDARY / BITS_PER_UNIT);
3353 /* If we saved any argument areas, restore them. */
3354 for (count = 0; count < nargs; count++)
3355 if (argvec[count].save_area)
3357 enum machine_mode save_mode = GET_MODE (argvec[count].save_area);
3359 = gen_rtx (MEM, save_mode,
3360 memory_address (save_mode, plus_constant (argblock,
3361 argvec[count].offset.constant)));
3363 emit_move_insn (stack_area, argvec[count].save_area);
3366 highest_outgoing_arg_in_use = initial_highest_arg_in_use;
3367 stack_usage_map = initial_stack_usage_map;
3374 /* Return an rtx which represents a suitable home on the stack
3375 given TYPE, the type of the argument looking for a home.
3376 This is called only for BLKmode arguments.
3378 SIZE is the size needed for this target.
3379 ARGS_ADDR is the address of the bottom of the argument block for this call.
3380 OFFSET describes this parameter's offset into ARGS_ADDR. It is meaningless
3381 if this machine uses push insns. */
3384 target_for_arg (type, size, args_addr, offset)
3388 struct args_size offset;
3391 rtx offset_rtx = ARGS_SIZE_RTX (offset);
3393 /* We do not call memory_address if possible,
3394 because we want to address as close to the stack
3395 as possible. For non-variable sized arguments,
3396 this will be stack-pointer relative addressing. */
3397 if (GET_CODE (offset_rtx) == CONST_INT)
3398 target = plus_constant (args_addr, INTVAL (offset_rtx));
3401 /* I have no idea how to guarantee that this
3402 will work in the presence of register parameters. */
3403 target = gen_rtx (PLUS, Pmode, args_addr, offset_rtx);
3404 target = memory_address (QImode, target);
3407 return gen_rtx (MEM, BLKmode, target);
3411 /* Store a single argument for a function call
3412 into the register or memory area where it must be passed.
3413 *ARG describes the argument value and where to pass it.
3415 ARGBLOCK is the address of the stack-block for all the arguments,
3416 or 0 on a machine where arguments are pushed individually.
3418 MAY_BE_ALLOCA nonzero says this could be a call to `alloca'
3419 so must be careful about how the stack is used.
3421 VARIABLE_SIZE nonzero says that this was a variable-sized outgoing
3422 argument stack. This is used if ACCUMULATE_OUTGOING_ARGS to indicate
3423 that we need not worry about saving and restoring the stack.
3425 FNDECL is the declaration of the function we are calling. */
3428 store_one_arg (arg, argblock, may_be_alloca, variable_size, fndecl,
3429 reg_parm_stack_space)
3430 struct arg_data *arg;
3435 int reg_parm_stack_space;
3437 register tree pval = arg->tree_value;
3441 int i, lower_bound, upper_bound;
3443 if (TREE_CODE (pval) == ERROR_MARK)
3446 /* Push a new temporary level for any temporaries we make for
3450 #ifdef ACCUMULATE_OUTGOING_ARGS
3451 /* If this is being stored into a pre-allocated, fixed-size, stack area,
3452 save any previous data at that location. */
3453 if (argblock && ! variable_size && arg->stack)
3455 #ifdef ARGS_GROW_DOWNWARD
3456 /* stack_slot is negative, but we want to index stack_usage_map
3457 with positive values. */
3458 if (GET_CODE (XEXP (arg->stack_slot, 0)) == PLUS)
3459 upper_bound = -INTVAL (XEXP (XEXP (arg->stack_slot, 0), 1)) + 1;
3463 lower_bound = upper_bound - arg->size.constant;
3465 if (GET_CODE (XEXP (arg->stack_slot, 0)) == PLUS)
3466 lower_bound = INTVAL (XEXP (XEXP (arg->stack_slot, 0), 1));
3470 upper_bound = lower_bound + arg->size.constant;
3473 for (i = lower_bound; i < upper_bound; i++)
3474 if (stack_usage_map[i]
3475 #ifdef REG_PARM_STACK_SPACE
3476 /* Don't store things in the fixed argument area at this point;
3477 it has already been saved. */
3478 && i > reg_parm_stack_space
3483 if (i != upper_bound)
3485 /* We need to make a save area. See what mode we can make it. */
3486 enum machine_mode save_mode
3487 = mode_for_size (arg->size.constant * BITS_PER_UNIT, MODE_INT, 1);
3489 = gen_rtx (MEM, save_mode,
3490 memory_address (save_mode, XEXP (arg->stack_slot, 0)));
3492 if (save_mode == BLKmode)
3494 arg->save_area = assign_stack_temp (BLKmode,
3495 arg->size.constant, 0);
3496 MEM_IN_STRUCT_P (arg->save_area)
3497 = AGGREGATE_TYPE_P (TREE_TYPE (arg->tree_value));
3498 preserve_temp_slots (arg->save_area);
3499 emit_block_move (validize_mem (arg->save_area), stack_area,
3500 GEN_INT (arg->size.constant),
3501 PARM_BOUNDARY / BITS_PER_UNIT);
3505 arg->save_area = gen_reg_rtx (save_mode);
3506 emit_move_insn (arg->save_area, stack_area);
3512 /* If this isn't going to be placed on both the stack and in registers,
3513 set up the register and number of words. */
3514 if (! arg->pass_on_stack)
3515 reg = arg->reg, partial = arg->partial;
3517 if (reg != 0 && partial == 0)
3518 /* Being passed entirely in a register. We shouldn't be called in
3522 /* If this arg needs special alignment, don't load the registers
3524 if (arg->n_aligned_regs != 0)
3527 /* If this is being passed partially in a register, we can't evaluate
3528 it directly into its stack slot. Otherwise, we can. */
3529 if (arg->value == 0)
3531 #ifdef ACCUMULATE_OUTGOING_ARGS
3532 /* stack_arg_under_construction is nonzero if a function argument is
3533 being evaluated directly into the outgoing argument list and
3534 expand_call must take special action to preserve the argument list
3535 if it is called recursively.
3537 For scalar function arguments stack_usage_map is sufficient to
3538 determine which stack slots must be saved and restored. Scalar
3539 arguments in general have pass_on_stack == 0.
3541 If this argument is initialized by a function which takes the
3542 address of the argument (a C++ constructor or a C function
3543 returning a BLKmode structure), then stack_usage_map is
3544 insufficient and expand_call must push the stack around the
3545 function call. Such arguments have pass_on_stack == 1.
3547 Note that it is always safe to set stack_arg_under_construction,
3548 but this generates suboptimal code if set when not needed. */
3550 if (arg->pass_on_stack)
3551 stack_arg_under_construction++;
3553 arg->value = expand_expr (pval,
3555 || TYPE_MODE (TREE_TYPE (pval)) != arg->mode)
3556 ? NULL_RTX : arg->stack,
3559 /* If we are promoting object (or for any other reason) the mode
3560 doesn't agree, convert the mode. */
3562 if (arg->mode != TYPE_MODE (TREE_TYPE (pval)))
3563 arg->value = convert_modes (arg->mode, TYPE_MODE (TREE_TYPE (pval)),
3564 arg->value, arg->unsignedp);
3566 #ifdef ACCUMULATE_OUTGOING_ARGS
3567 if (arg->pass_on_stack)
3568 stack_arg_under_construction--;
3572 /* Don't allow anything left on stack from computation
3573 of argument to alloca. */
3575 do_pending_stack_adjust ();
3577 if (arg->value == arg->stack)
3579 /* If the value is already in the stack slot, we are done. */
3580 if (flag_check_memory_usage && GET_CODE (arg->stack) == MEM)
3582 if (arg->mode == BLKmode)
3585 emit_library_call (chkr_set_right_libfunc, 1, VOIDmode, 3,
3586 XEXP (arg->stack, 0), ptr_mode,
3587 GEN_INT (GET_MODE_SIZE (arg->mode)),
3588 TYPE_MODE (sizetype),
3589 GEN_INT (MEMORY_USE_RW),
3590 TYPE_MODE (integer_type_node));
3593 else if (arg->mode != BLKmode)
3597 /* Argument is a scalar, not entirely passed in registers.
3598 (If part is passed in registers, arg->partial says how much
3599 and emit_push_insn will take care of putting it there.)
3601 Push it, and if its size is less than the
3602 amount of space allocated to it,
3603 also bump stack pointer by the additional space.
3604 Note that in C the default argument promotions
3605 will prevent such mismatches. */
3607 size = GET_MODE_SIZE (arg->mode);
3608 /* Compute how much space the push instruction will push.
3609 On many machines, pushing a byte will advance the stack
3610 pointer by a halfword. */
3611 #ifdef PUSH_ROUNDING
3612 size = PUSH_ROUNDING (size);
3616 /* Compute how much space the argument should get:
3617 round up to a multiple of the alignment for arguments. */
3618 if (none != FUNCTION_ARG_PADDING (arg->mode, TREE_TYPE (pval)))
3619 used = (((size + PARM_BOUNDARY / BITS_PER_UNIT - 1)
3620 / (PARM_BOUNDARY / BITS_PER_UNIT))
3621 * (PARM_BOUNDARY / BITS_PER_UNIT));
3623 /* This isn't already where we want it on the stack, so put it there.
3624 This can either be done with push or copy insns. */
3625 emit_push_insn (arg->value, arg->mode, TREE_TYPE (pval), NULL_RTX,
3626 0, partial, reg, used - size,
3627 argblock, ARGS_SIZE_RTX (arg->offset));
3631 /* BLKmode, at least partly to be pushed. */
3633 register int excess;
3636 /* Pushing a nonscalar.
3637 If part is passed in registers, PARTIAL says how much
3638 and emit_push_insn will take care of putting it there. */
3640 /* Round its size up to a multiple
3641 of the allocation unit for arguments. */
3643 if (arg->size.var != 0)
3646 size_rtx = ARGS_SIZE_RTX (arg->size);
3650 /* PUSH_ROUNDING has no effect on us, because
3651 emit_push_insn for BLKmode is careful to avoid it. */
3652 excess = (arg->size.constant - int_size_in_bytes (TREE_TYPE (pval))
3653 + partial * UNITS_PER_WORD);
3654 size_rtx = expr_size (pval);
3657 emit_push_insn (arg->value, arg->mode, TREE_TYPE (pval), size_rtx,
3658 TYPE_ALIGN (TREE_TYPE (pval)) / BITS_PER_UNIT, partial,
3659 reg, excess, argblock, ARGS_SIZE_RTX (arg->offset));
3663 /* Unless this is a partially-in-register argument, the argument is now
3666 ??? Note that this can change arg->value from arg->stack to
3667 arg->stack_slot and it matters when they are not the same.
3668 It isn't totally clear that this is correct in all cases. */
3670 arg->value = arg->stack_slot;
3672 /* Once we have pushed something, pops can't safely
3673 be deferred during the rest of the arguments. */
3676 /* ANSI doesn't require a sequence point here,
3677 but PCC has one, so this will avoid some problems. */
3680 /* Free any temporary slots made in processing this argument. Show
3681 that we might have taken the address of something and pushed that
3683 preserve_temp_slots (NULL_RTX);
3687 #ifdef ACCUMULATE_OUTGOING_ARGS
3688 /* Now mark the segment we just used. */
3689 if (argblock && ! variable_size && arg->stack)
3690 for (i = lower_bound; i < upper_bound; i++)
3691 stack_usage_map[i] = 1;