1 /* Expand builtin functions.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
30 #include "hard-reg-set.h"
33 #include "insn-config.h"
39 #include "typeclass.h"
45 #define CALLED_AS_BUILT_IN(NODE) \
46 (!strncmp (IDENTIFIER_POINTER (DECL_NAME (NODE)), "__builtin_", 10))
48 /* Register mappings for target machines without register windows. */
49 #ifndef INCOMING_REGNO
50 #define INCOMING_REGNO(OUT) (OUT)
52 #ifndef OUTGOING_REGNO
53 #define OUTGOING_REGNO(IN) (IN)
56 #ifndef PAD_VARARGS_DOWN
57 #define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
60 /* Define the names of the builtin function types and codes. */
61 const char *const built_in_class_names[4]
62 = {"NOT_BUILT_IN", "BUILT_IN_FRONTEND", "BUILT_IN_MD", "BUILT_IN_NORMAL"};
64 #define DEF_BUILTIN(X, N, C, T, LT, B, F, NA) STRINGX(X),
65 const char *const built_in_names[(int) END_BUILTINS] =
67 #include "builtins.def"
71 /* Setup an array of _DECL trees, make sure each element is
72 initialized to NULL_TREE. */
73 tree built_in_decls[(int) END_BUILTINS];
75 tree (*lang_type_promotes_to) PARAMS ((tree));
77 static int get_pointer_alignment PARAMS ((tree, unsigned int));
78 static tree c_strlen PARAMS ((tree));
79 static const char *c_getstr PARAMS ((tree));
80 static rtx c_readstr PARAMS ((const char *,
82 static int target_char_cast PARAMS ((tree, char *));
83 static rtx get_memory_rtx PARAMS ((tree));
84 static int apply_args_size PARAMS ((void));
85 static int apply_result_size PARAMS ((void));
86 #if defined (HAVE_untyped_call) || defined (HAVE_untyped_return)
87 static rtx result_vector PARAMS ((int, rtx));
89 static rtx expand_builtin_setjmp PARAMS ((tree, rtx));
90 static rtx expand_builtin_apply_args PARAMS ((void));
91 static rtx expand_builtin_apply_args_1 PARAMS ((void));
92 static rtx expand_builtin_apply PARAMS ((rtx, rtx, rtx));
93 static void expand_builtin_return PARAMS ((rtx));
94 static enum type_class type_to_class PARAMS ((tree));
95 static rtx expand_builtin_classify_type PARAMS ((tree));
96 static rtx expand_builtin_mathfn PARAMS ((tree, rtx, rtx));
97 static rtx expand_builtin_constant_p PARAMS ((tree));
98 static rtx expand_builtin_args_info PARAMS ((tree));
99 static rtx expand_builtin_next_arg PARAMS ((tree));
100 static rtx expand_builtin_va_start PARAMS ((int, tree));
101 static rtx expand_builtin_va_end PARAMS ((tree));
102 static rtx expand_builtin_va_copy PARAMS ((tree));
104 static rtx expand_builtin_memcmp PARAMS ((tree, tree, rtx));
106 static rtx expand_builtin_strcmp PARAMS ((tree, rtx,
108 static rtx expand_builtin_strncmp PARAMS ((tree, rtx,
110 static rtx builtin_memcpy_read_str PARAMS ((PTR, HOST_WIDE_INT,
112 static rtx expand_builtin_strcat PARAMS ((tree, rtx,
114 static rtx expand_builtin_strncat PARAMS ((tree, rtx,
116 static rtx expand_builtin_strspn PARAMS ((tree, rtx,
118 static rtx expand_builtin_strcspn PARAMS ((tree, rtx,
120 static rtx expand_builtin_memcpy PARAMS ((tree));
121 static rtx expand_builtin_strcpy PARAMS ((tree));
122 static rtx builtin_strncpy_read_str PARAMS ((PTR, HOST_WIDE_INT,
124 static rtx expand_builtin_strncpy PARAMS ((tree, rtx,
126 static rtx builtin_memset_read_str PARAMS ((PTR, HOST_WIDE_INT,
128 static rtx expand_builtin_memset PARAMS ((tree));
129 static rtx expand_builtin_bzero PARAMS ((tree));
130 static rtx expand_builtin_strlen PARAMS ((tree, rtx));
131 static rtx expand_builtin_strstr PARAMS ((tree, rtx,
133 static rtx expand_builtin_strpbrk PARAMS ((tree, rtx,
135 static rtx expand_builtin_strchr PARAMS ((tree, rtx,
137 static rtx expand_builtin_strrchr PARAMS ((tree, rtx,
139 static rtx expand_builtin_alloca PARAMS ((tree, rtx));
140 static rtx expand_builtin_ffs PARAMS ((tree, rtx, rtx));
141 static rtx expand_builtin_frame_address PARAMS ((tree));
142 static rtx expand_builtin_fputs PARAMS ((tree, int));
143 static tree stabilize_va_list PARAMS ((tree, int));
144 static rtx expand_builtin_expect PARAMS ((tree, rtx));
145 static tree fold_builtin_constant_p PARAMS ((tree));
146 static tree fold_builtin_classify_type PARAMS ((tree));
147 static tree build_function_call_expr PARAMS ((tree, tree));
148 static int validate_arglist PARAMS ((tree, ...));
150 /* Return the alignment in bits of EXP, a pointer valued expression.
151 But don't return more than MAX_ALIGN no matter what.
152 The alignment returned is, by default, the alignment of the thing that
153 EXP points to. If it is not a POINTER_TYPE, 0 is returned.
155 Otherwise, look at the expression to see if we can do better, i.e., if the
156 expression is actually pointing at an object whose alignment is tighter. */
159 get_pointer_alignment (exp, max_align)
161 unsigned int max_align;
163 unsigned int align, inner;
165 if (TREE_CODE (TREE_TYPE (exp)) != POINTER_TYPE)
168 align = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp)));
169 align = MIN (align, max_align);
173 switch (TREE_CODE (exp))
177 case NON_LVALUE_EXPR:
178 exp = TREE_OPERAND (exp, 0);
179 if (TREE_CODE (TREE_TYPE (exp)) != POINTER_TYPE)
182 inner = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp)));
183 align = MIN (inner, max_align);
187 /* If sum of pointer + int, restrict our maximum alignment to that
188 imposed by the integer. If not, we can't do any better than
190 if (! host_integerp (TREE_OPERAND (exp, 1), 1))
193 while (((tree_low_cst (TREE_OPERAND (exp, 1), 1))
194 & (max_align / BITS_PER_UNIT - 1))
198 exp = TREE_OPERAND (exp, 0);
202 /* See what we are pointing at and look at its alignment. */
203 exp = TREE_OPERAND (exp, 0);
204 if (TREE_CODE (exp) == FUNCTION_DECL)
205 align = FUNCTION_BOUNDARY;
206 else if (DECL_P (exp))
207 align = DECL_ALIGN (exp);
208 #ifdef CONSTANT_ALIGNMENT
209 else if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'c')
210 align = CONSTANT_ALIGNMENT (exp, align);
212 return MIN (align, max_align);
220 /* Compute the length of a C string. TREE_STRING_LENGTH is not the right
221 way, because it could contain a zero byte in the middle.
222 TREE_STRING_LENGTH is the size of the character array, not the string.
224 The value returned is of type `ssizetype'.
226 Unfortunately, string_constant can't access the values of const char
227 arrays with initializers, so neither can we do so here. */
234 HOST_WIDE_INT offset;
238 src = string_constant (src, &offset_node);
242 max = TREE_STRING_LENGTH (src) - 1;
243 ptr = TREE_STRING_POINTER (src);
245 if (offset_node && TREE_CODE (offset_node) != INTEGER_CST)
247 /* If the string has an internal zero byte (e.g., "foo\0bar"), we can't
248 compute the offset to the following null if we don't know where to
249 start searching for it. */
252 for (i = 0; i < max; i++)
256 /* We don't know the starting offset, but we do know that the string
257 has no internal zero bytes. We can assume that the offset falls
258 within the bounds of the string; otherwise, the programmer deserves
259 what he gets. Subtract the offset from the length of the string,
260 and return that. This would perhaps not be valid if we were dealing
261 with named arrays in addition to literal string constants. */
263 return size_diffop (size_int (max), offset_node);
266 /* We have a known offset into the string. Start searching there for
267 a null character if we can represent it as a single HOST_WIDE_INT. */
268 if (offset_node == 0)
270 else if (! host_integerp (offset_node, 0))
273 offset = tree_low_cst (offset_node, 0);
275 /* If the offset is known to be out of bounds, warn, and call strlen at
277 if (offset < 0 || offset > max)
279 warning ("offset outside bounds of constant string");
283 /* Use strlen to search for the first zero byte. Since any strings
284 constructed with build_string will have nulls appended, we win even
285 if we get handed something like (char[4])"abcd".
287 Since OFFSET is our starting index into the string, no further
288 calculation is needed. */
289 return ssize_int (strlen (ptr + offset));
292 /* Return a char pointer for a C string if it is a string constant
293 or sum of string constant and integer constant. */
300 HOST_WIDE_INT offset;
302 src = string_constant (src, &offset_node);
306 if (offset_node == 0)
307 return TREE_STRING_POINTER (src);
308 else if (!host_integerp (offset_node, 1)
309 || compare_tree_int (offset_node, TREE_STRING_LENGTH (src) - 1) > 0)
312 return TREE_STRING_POINTER (src) + tree_low_cst (offset_node, 1);
315 /* Return a CONST_INT or CONST_DOUBLE corresponding to target reading
316 GET_MODE_BITSIZE (MODE) bits from string constant STR. */
319 c_readstr (str, mode)
321 enum machine_mode mode;
327 if (GET_MODE_CLASS (mode) != MODE_INT)
332 for (i = 0; i < GET_MODE_SIZE (mode); i++)
335 if (WORDS_BIG_ENDIAN)
336 j = GET_MODE_SIZE (mode) - i - 1;
337 if (BYTES_BIG_ENDIAN != WORDS_BIG_ENDIAN
338 && GET_MODE_SIZE (mode) > UNITS_PER_WORD)
339 j = j + UNITS_PER_WORD - 2 * (j % UNITS_PER_WORD) - 1;
341 if (j > 2 * HOST_BITS_PER_WIDE_INT)
344 ch = (unsigned char) str[i];
345 c[j / HOST_BITS_PER_WIDE_INT] |= ch << (j % HOST_BITS_PER_WIDE_INT);
347 return immed_double_const (c[0], c[1], mode);
350 /* Cast a target constant CST to target CHAR and if that value fits into
351 host char type, return zero and put that value into variable pointed by
355 target_char_cast (cst, p)
359 unsigned HOST_WIDE_INT val, hostval;
361 if (!host_integerp (cst, 1)
362 || CHAR_TYPE_SIZE > HOST_BITS_PER_WIDE_INT)
365 val = tree_low_cst (cst, 1);
366 if (CHAR_TYPE_SIZE < HOST_BITS_PER_WIDE_INT)
367 val &= (((unsigned HOST_WIDE_INT) 1) << CHAR_TYPE_SIZE) - 1;
370 if (HOST_BITS_PER_CHAR < HOST_BITS_PER_WIDE_INT)
371 hostval &= (((unsigned HOST_WIDE_INT) 1) << HOST_BITS_PER_CHAR) - 1;
380 /* Given TEM, a pointer to a stack frame, follow the dynamic chain COUNT
381 times to get the address of either a higher stack frame, or a return
382 address located within it (depending on FNDECL_CODE). */
385 expand_builtin_return_addr (fndecl_code, count, tem)
386 enum built_in_function fndecl_code;
392 /* Some machines need special handling before we can access
393 arbitrary frames. For example, on the sparc, we must first flush
394 all register windows to the stack. */
395 #ifdef SETUP_FRAME_ADDRESSES
397 SETUP_FRAME_ADDRESSES ();
400 /* On the sparc, the return address is not in the frame, it is in a
401 register. There is no way to access it off of the current frame
402 pointer, but it can be accessed off the previous frame pointer by
403 reading the value from the register window save area. */
404 #ifdef RETURN_ADDR_IN_PREVIOUS_FRAME
405 if (fndecl_code == BUILT_IN_RETURN_ADDRESS)
409 /* Scan back COUNT frames to the specified frame. */
410 for (i = 0; i < count; i++)
412 /* Assume the dynamic chain pointer is in the word that the
413 frame address points to, unless otherwise specified. */
414 #ifdef DYNAMIC_CHAIN_ADDRESS
415 tem = DYNAMIC_CHAIN_ADDRESS (tem);
417 tem = memory_address (Pmode, tem);
418 tem = gen_rtx_MEM (Pmode, tem);
419 set_mem_alias_set (tem, get_frame_alias_set ());
420 tem = copy_to_reg (tem);
423 /* For __builtin_frame_address, return what we've got. */
424 if (fndecl_code == BUILT_IN_FRAME_ADDRESS)
427 /* For __builtin_return_address, Get the return address from that
429 #ifdef RETURN_ADDR_RTX
430 tem = RETURN_ADDR_RTX (count, tem);
432 tem = memory_address (Pmode,
433 plus_constant (tem, GET_MODE_SIZE (Pmode)));
434 tem = gen_rtx_MEM (Pmode, tem);
435 set_mem_alias_set (tem, get_frame_alias_set ());
440 /* Alias set used for setjmp buffer. */
441 static HOST_WIDE_INT setjmp_alias_set = -1;
443 /* Construct the leading half of a __builtin_setjmp call. Control will
444 return to RECEIVER_LABEL. This is used directly by sjlj exception
448 expand_builtin_setjmp_setup (buf_addr, receiver_label)
452 enum machine_mode sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL);
456 if (setjmp_alias_set == -1)
457 setjmp_alias_set = new_alias_set ();
459 #ifdef POINTERS_EXTEND_UNSIGNED
460 buf_addr = convert_memory_address (Pmode, buf_addr);
463 buf_addr = force_reg (Pmode, force_operand (buf_addr, NULL_RTX));
467 /* We store the frame pointer and the address of receiver_label in
468 the buffer and use the rest of it for the stack save area, which
469 is machine-dependent. */
471 #ifndef BUILTIN_SETJMP_FRAME_VALUE
472 #define BUILTIN_SETJMP_FRAME_VALUE virtual_stack_vars_rtx
475 mem = gen_rtx_MEM (Pmode, buf_addr);
476 set_mem_alias_set (mem, setjmp_alias_set);
477 emit_move_insn (mem, BUILTIN_SETJMP_FRAME_VALUE);
479 mem = gen_rtx_MEM (Pmode, plus_constant (buf_addr, GET_MODE_SIZE (Pmode))),
480 set_mem_alias_set (mem, setjmp_alias_set);
482 emit_move_insn (validize_mem (mem),
483 force_reg (Pmode, gen_rtx_LABEL_REF (Pmode, receiver_label)));
485 stack_save = gen_rtx_MEM (sa_mode,
486 plus_constant (buf_addr,
487 2 * GET_MODE_SIZE (Pmode)));
488 set_mem_alias_set (stack_save, setjmp_alias_set);
489 emit_stack_save (SAVE_NONLOCAL, &stack_save, NULL_RTX);
491 /* If there is further processing to do, do it. */
492 #ifdef HAVE_builtin_setjmp_setup
493 if (HAVE_builtin_setjmp_setup)
494 emit_insn (gen_builtin_setjmp_setup (buf_addr));
497 /* Tell optimize_save_area_alloca that extra work is going to
498 need to go on during alloca. */
499 current_function_calls_setjmp = 1;
501 /* Set this so all the registers get saved in our frame; we need to be
502 able to copy the saved values for any registers from frames we unwind. */
503 current_function_has_nonlocal_label = 1;
506 /* Construct the trailing part of a __builtin_setjmp call.
507 This is used directly by sjlj exception handling code. */
510 expand_builtin_setjmp_receiver (receiver_label)
511 rtx receiver_label ATTRIBUTE_UNUSED;
513 /* Clobber the FP when we get here, so we have to make sure it's
514 marked as used by this function. */
515 emit_insn (gen_rtx_USE (VOIDmode, hard_frame_pointer_rtx));
517 /* Mark the static chain as clobbered here so life information
518 doesn't get messed up for it. */
519 emit_insn (gen_rtx_CLOBBER (VOIDmode, static_chain_rtx));
521 /* Now put in the code to restore the frame pointer, and argument
522 pointer, if needed. The code below is from expand_end_bindings
523 in stmt.c; see detailed documentation there. */
524 #ifdef HAVE_nonlocal_goto
525 if (! HAVE_nonlocal_goto)
527 emit_move_insn (virtual_stack_vars_rtx, hard_frame_pointer_rtx);
529 #if ARG_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM
530 if (fixed_regs[ARG_POINTER_REGNUM])
532 #ifdef ELIMINABLE_REGS
534 static struct elims {int from, to;} elim_regs[] = ELIMINABLE_REGS;
536 for (i = 0; i < ARRAY_SIZE (elim_regs); i++)
537 if (elim_regs[i].from == ARG_POINTER_REGNUM
538 && elim_regs[i].to == HARD_FRAME_POINTER_REGNUM)
541 if (i == ARRAY_SIZE (elim_regs))
544 /* Now restore our arg pointer from the address at which it
545 was saved in our stack frame. */
546 emit_move_insn (virtual_incoming_args_rtx,
547 copy_to_reg (get_arg_pointer_save_area (cfun)));
552 #ifdef HAVE_builtin_setjmp_receiver
553 if (HAVE_builtin_setjmp_receiver)
554 emit_insn (gen_builtin_setjmp_receiver (receiver_label));
557 #ifdef HAVE_nonlocal_goto_receiver
558 if (HAVE_nonlocal_goto_receiver)
559 emit_insn (gen_nonlocal_goto_receiver ());
564 /* @@@ This is a kludge. Not all machine descriptions define a blockage
565 insn, but we must not allow the code we just generated to be reordered
566 by scheduling. Specifically, the update of the frame pointer must
567 happen immediately, not later. So emit an ASM_INPUT to act as blockage
569 emit_insn (gen_rtx_ASM_INPUT (VOIDmode, ""));
572 /* __builtin_setjmp is passed a pointer to an array of five words (not
573 all will be used on all machines). It operates similarly to the C
574 library function of the same name, but is more efficient. Much of
575 the code below (and for longjmp) is copied from the handling of
578 NOTE: This is intended for use by GNAT and the exception handling
579 scheme in the compiler and will only work in the method used by
583 expand_builtin_setjmp (arglist, target)
587 rtx buf_addr, next_lab, cont_lab;
589 if (!validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
592 if (target == 0 || GET_CODE (target) != REG
593 || REGNO (target) < FIRST_PSEUDO_REGISTER)
594 target = gen_reg_rtx (TYPE_MODE (integer_type_node));
596 buf_addr = expand_expr (TREE_VALUE (arglist), NULL_RTX, VOIDmode, 0);
598 next_lab = gen_label_rtx ();
599 cont_lab = gen_label_rtx ();
601 expand_builtin_setjmp_setup (buf_addr, next_lab);
603 /* Set TARGET to zero and branch to the continue label. */
604 emit_move_insn (target, const0_rtx);
605 emit_jump_insn (gen_jump (cont_lab));
607 emit_label (next_lab);
609 expand_builtin_setjmp_receiver (next_lab);
611 /* Set TARGET to one. */
612 emit_move_insn (target, const1_rtx);
613 emit_label (cont_lab);
615 /* Tell flow about the strange goings on. Putting `next_lab' on
616 `nonlocal_goto_handler_labels' to indicates that function
617 calls may traverse the arc back to this label. */
619 current_function_has_nonlocal_label = 1;
620 nonlocal_goto_handler_labels
621 = gen_rtx_EXPR_LIST (VOIDmode, next_lab, nonlocal_goto_handler_labels);
626 /* __builtin_longjmp is passed a pointer to an array of five words (not
627 all will be used on all machines). It operates similarly to the C
628 library function of the same name, but is more efficient. Much of
629 the code below is copied from the handling of non-local gotos.
631 NOTE: This is intended for use by GNAT and the exception handling
632 scheme in the compiler and will only work in the method used by
636 expand_builtin_longjmp (buf_addr, value)
639 rtx fp, lab, stack, insn;
640 enum machine_mode sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL);
642 if (setjmp_alias_set == -1)
643 setjmp_alias_set = new_alias_set ();
645 #ifdef POINTERS_EXTEND_UNSIGNED
646 buf_addr = convert_memory_address (Pmode, buf_addr);
648 buf_addr = force_reg (Pmode, buf_addr);
650 /* We used to store value in static_chain_rtx, but that fails if pointers
651 are smaller than integers. We instead require that the user must pass
652 a second argument of 1, because that is what builtin_setjmp will
653 return. This also makes EH slightly more efficient, since we are no
654 longer copying around a value that we don't care about. */
655 if (value != const1_rtx)
658 current_function_calls_longjmp = 1;
660 #ifdef HAVE_builtin_longjmp
661 if (HAVE_builtin_longjmp)
662 emit_insn (gen_builtin_longjmp (buf_addr));
666 fp = gen_rtx_MEM (Pmode, buf_addr);
667 lab = gen_rtx_MEM (Pmode, plus_constant (buf_addr,
668 GET_MODE_SIZE (Pmode)));
670 stack = gen_rtx_MEM (sa_mode, plus_constant (buf_addr,
671 2 * GET_MODE_SIZE (Pmode)));
672 set_mem_alias_set (fp, setjmp_alias_set);
673 set_mem_alias_set (lab, setjmp_alias_set);
674 set_mem_alias_set (stack, setjmp_alias_set);
676 /* Pick up FP, label, and SP from the block and jump. This code is
677 from expand_goto in stmt.c; see there for detailed comments. */
678 #if HAVE_nonlocal_goto
679 if (HAVE_nonlocal_goto)
680 /* We have to pass a value to the nonlocal_goto pattern that will
681 get copied into the static_chain pointer, but it does not matter
682 what that value is, because builtin_setjmp does not use it. */
683 emit_insn (gen_nonlocal_goto (value, lab, stack, fp));
687 lab = copy_to_reg (lab);
689 emit_move_insn (hard_frame_pointer_rtx, fp);
690 emit_stack_restore (SAVE_NONLOCAL, stack, NULL_RTX);
692 emit_insn (gen_rtx_USE (VOIDmode, hard_frame_pointer_rtx));
693 emit_insn (gen_rtx_USE (VOIDmode, stack_pointer_rtx));
694 emit_indirect_jump (lab);
698 /* Search backwards and mark the jump insn as a non-local goto.
699 Note that this precludes the use of __builtin_longjmp to a
700 __builtin_setjmp target in the same function. However, we've
701 already cautioned the user that these functions are for
702 internal exception handling use only. */
703 for (insn = get_last_insn (); insn; insn = PREV_INSN (insn))
705 if (GET_CODE (insn) == JUMP_INSN)
707 REG_NOTES (insn) = alloc_EXPR_LIST (REG_NON_LOCAL_GOTO, const0_rtx,
711 else if (GET_CODE (insn) == CALL_INSN)
716 /* Get a MEM rtx for expression EXP which is the address of an operand
717 to be used to be used in a string instruction (cmpstrsi, movstrsi, ..). */
723 rtx mem = gen_rtx_MEM (BLKmode,
724 memory_address (BLKmode,
725 expand_expr (exp, NULL_RTX,
726 ptr_mode, EXPAND_SUM)));
728 /* Get an expression we can use to find the attributes to assign to MEM.
729 If it is an ADDR_EXPR, use the operand. Otherwise, dereference it if
730 we can. First remove any nops. */
731 while ((TREE_CODE (exp) == NOP_EXPR || TREE_CODE (exp) == CONVERT_EXPR
732 || TREE_CODE (exp) == NON_LVALUE_EXPR)
733 && POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (exp, 0))))
734 exp = TREE_OPERAND (exp, 0);
736 if (TREE_CODE (exp) == ADDR_EXPR)
737 exp = TREE_OPERAND (exp, 0);
738 else if (POINTER_TYPE_P (TREE_TYPE (exp)))
739 exp = build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (exp)), exp);
743 set_mem_attributes (mem, exp, 0);
744 /* memcpy, memset and other builtin stringops can alias with anything. */
745 set_mem_alias_set (mem, 0);
749 /* Built-in functions to perform an untyped call and return. */
751 /* For each register that may be used for calling a function, this
752 gives a mode used to copy the register's value. VOIDmode indicates
753 the register is not used for calling a function. If the machine
754 has register windows, this gives only the outbound registers.
755 INCOMING_REGNO gives the corresponding inbound register. */
756 static enum machine_mode apply_args_mode[FIRST_PSEUDO_REGISTER];
758 /* For each register that may be used for returning values, this gives
759 a mode used to copy the register's value. VOIDmode indicates the
760 register is not used for returning values. If the machine has
761 register windows, this gives only the outbound registers.
762 INCOMING_REGNO gives the corresponding inbound register. */
763 static enum machine_mode apply_result_mode[FIRST_PSEUDO_REGISTER];
765 /* For each register that may be used for calling a function, this
766 gives the offset of that register into the block returned by
767 __builtin_apply_args. 0 indicates that the register is not
768 used for calling a function. */
769 static int apply_args_reg_offset[FIRST_PSEUDO_REGISTER];
771 /* Return the offset of register REGNO into the block returned by
772 __builtin_apply_args. This is not declared static, since it is
773 needed in objc-act.c. */
776 apply_args_register_offset (regno)
781 /* Arguments are always put in outgoing registers (in the argument
782 block) if such make sense. */
783 #ifdef OUTGOING_REGNO
784 regno = OUTGOING_REGNO(regno);
786 return apply_args_reg_offset[regno];
789 /* Return the size required for the block returned by __builtin_apply_args,
790 and initialize apply_args_mode. */
795 static int size = -1;
797 enum machine_mode mode;
799 /* The values computed by this function never change. */
802 /* The first value is the incoming arg-pointer. */
803 size = GET_MODE_SIZE (Pmode);
805 /* The second value is the structure value address unless this is
806 passed as an "invisible" first argument. */
807 if (struct_value_rtx)
808 size += GET_MODE_SIZE (Pmode);
810 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
811 if (FUNCTION_ARG_REGNO_P (regno))
813 /* Search for the proper mode for copying this register's
814 value. I'm not sure this is right, but it works so far. */
815 enum machine_mode best_mode = VOIDmode;
817 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
819 mode = GET_MODE_WIDER_MODE (mode))
820 if (HARD_REGNO_MODE_OK (regno, mode)
821 && HARD_REGNO_NREGS (regno, mode) == 1)
824 if (best_mode == VOIDmode)
825 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
827 mode = GET_MODE_WIDER_MODE (mode))
828 if (HARD_REGNO_MODE_OK (regno, mode)
829 && have_insn_for (SET, mode))
833 if (mode == VOIDmode)
836 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
837 if (size % align != 0)
838 size = CEIL (size, align) * align;
839 apply_args_reg_offset[regno] = size;
840 size += GET_MODE_SIZE (mode);
841 apply_args_mode[regno] = mode;
845 apply_args_mode[regno] = VOIDmode;
846 apply_args_reg_offset[regno] = 0;
852 /* Return the size required for the block returned by __builtin_apply,
853 and initialize apply_result_mode. */
858 static int size = -1;
860 enum machine_mode mode;
862 /* The values computed by this function never change. */
867 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
868 if (FUNCTION_VALUE_REGNO_P (regno))
870 /* Search for the proper mode for copying this register's
871 value. I'm not sure this is right, but it works so far. */
872 enum machine_mode best_mode = VOIDmode;
874 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
876 mode = GET_MODE_WIDER_MODE (mode))
877 if (HARD_REGNO_MODE_OK (regno, mode))
880 if (best_mode == VOIDmode)
881 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
883 mode = GET_MODE_WIDER_MODE (mode))
884 if (HARD_REGNO_MODE_OK (regno, mode)
885 && have_insn_for (SET, mode))
889 if (mode == VOIDmode)
892 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
893 if (size % align != 0)
894 size = CEIL (size, align) * align;
895 size += GET_MODE_SIZE (mode);
896 apply_result_mode[regno] = mode;
899 apply_result_mode[regno] = VOIDmode;
901 /* Allow targets that use untyped_call and untyped_return to override
902 the size so that machine-specific information can be stored here. */
903 #ifdef APPLY_RESULT_SIZE
904 size = APPLY_RESULT_SIZE;
910 #if defined (HAVE_untyped_call) || defined (HAVE_untyped_return)
911 /* Create a vector describing the result block RESULT. If SAVEP is true,
912 the result block is used to save the values; otherwise it is used to
913 restore the values. */
916 result_vector (savep, result)
920 int regno, size, align, nelts;
921 enum machine_mode mode;
923 rtx *savevec = (rtx *) alloca (FIRST_PSEUDO_REGISTER * sizeof (rtx));
926 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
927 if ((mode = apply_result_mode[regno]) != VOIDmode)
929 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
930 if (size % align != 0)
931 size = CEIL (size, align) * align;
932 reg = gen_rtx_REG (mode, savep ? regno : INCOMING_REGNO (regno));
933 mem = adjust_address (result, mode, size);
934 savevec[nelts++] = (savep
935 ? gen_rtx_SET (VOIDmode, mem, reg)
936 : gen_rtx_SET (VOIDmode, reg, mem));
937 size += GET_MODE_SIZE (mode);
939 return gen_rtx_PARALLEL (VOIDmode, gen_rtvec_v (nelts, savevec));
941 #endif /* HAVE_untyped_call or HAVE_untyped_return */
943 /* Save the state required to perform an untyped call with the same
944 arguments as were passed to the current function. */
947 expand_builtin_apply_args_1 ()
950 int size, align, regno;
951 enum machine_mode mode;
953 /* Create a block where the arg-pointer, structure value address,
954 and argument registers can be saved. */
955 registers = assign_stack_local (BLKmode, apply_args_size (), -1);
957 /* Walk past the arg-pointer and structure value address. */
958 size = GET_MODE_SIZE (Pmode);
959 if (struct_value_rtx)
960 size += GET_MODE_SIZE (Pmode);
962 /* Save each register used in calling a function to the block. */
963 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
964 if ((mode = apply_args_mode[regno]) != VOIDmode)
968 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
969 if (size % align != 0)
970 size = CEIL (size, align) * align;
972 tem = gen_rtx_REG (mode, INCOMING_REGNO (regno));
974 emit_move_insn (adjust_address (registers, mode, size), tem);
975 size += GET_MODE_SIZE (mode);
978 /* Save the arg pointer to the block. */
979 emit_move_insn (adjust_address (registers, Pmode, 0),
980 copy_to_reg (virtual_incoming_args_rtx));
981 size = GET_MODE_SIZE (Pmode);
983 /* Save the structure value address unless this is passed as an
984 "invisible" first argument. */
985 if (struct_value_incoming_rtx)
987 emit_move_insn (adjust_address (registers, Pmode, size),
988 copy_to_reg (struct_value_incoming_rtx));
989 size += GET_MODE_SIZE (Pmode);
992 /* Return the address of the block. */
993 return copy_addr_to_reg (XEXP (registers, 0));
996 /* __builtin_apply_args returns block of memory allocated on
997 the stack into which is stored the arg pointer, structure
998 value address, static chain, and all the registers that might
999 possibly be used in performing a function call. The code is
1000 moved to the start of the function so the incoming values are
1004 expand_builtin_apply_args ()
1006 /* Don't do __builtin_apply_args more than once in a function.
1007 Save the result of the first call and reuse it. */
1008 if (apply_args_value != 0)
1009 return apply_args_value;
1011 /* When this function is called, it means that registers must be
1012 saved on entry to this function. So we migrate the
1013 call to the first insn of this function. */
1018 temp = expand_builtin_apply_args_1 ();
1022 apply_args_value = temp;
1024 /* Put the sequence after the NOTE that starts the function.
1025 If this is inside a SEQUENCE, make the outer-level insn
1026 chain current, so the code is placed at the start of the
1028 push_topmost_sequence ();
1029 emit_insns_before (seq, NEXT_INSN (get_insns ()));
1030 pop_topmost_sequence ();
1035 /* Perform an untyped call and save the state required to perform an
1036 untyped return of whatever value was returned by the given function. */
1039 expand_builtin_apply (function, arguments, argsize)
1040 rtx function, arguments, argsize;
1042 int size, align, regno;
1043 enum machine_mode mode;
1044 rtx incoming_args, result, reg, dest, call_insn;
1045 rtx old_stack_level = 0;
1046 rtx call_fusage = 0;
1048 /* Create a block where the return registers can be saved. */
1049 result = assign_stack_local (BLKmode, apply_result_size (), -1);
1051 /* Fetch the arg pointer from the ARGUMENTS block. */
1052 incoming_args = gen_reg_rtx (Pmode);
1053 emit_move_insn (incoming_args,
1054 gen_rtx_MEM (Pmode, arguments));
1055 #ifndef STACK_GROWS_DOWNWARD
1056 incoming_args = expand_simple_binop (Pmode, MINUS, incoming_args, argsize,
1057 incoming_args, 0, OPTAB_LIB_WIDEN);
1060 /* Perform postincrements before actually calling the function. */
1063 /* Push a new argument block and copy the arguments. Do not allow
1064 the (potential) memcpy call below to interfere with our stack
1066 do_pending_stack_adjust ();
1069 /* Save the stack with nonlocal if available */
1070 #ifdef HAVE_save_stack_nonlocal
1071 if (HAVE_save_stack_nonlocal)
1072 emit_stack_save (SAVE_NONLOCAL, &old_stack_level, NULL_RTX);
1075 emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX);
1077 /* Push a block of memory onto the stack to store the memory arguments.
1078 Save the address in a register, and copy the memory arguments. ??? I
1079 haven't figured out how the calling convention macros effect this,
1080 but it's likely that the source and/or destination addresses in
1081 the block copy will need updating in machine specific ways. */
1082 dest = allocate_dynamic_stack_space (argsize, 0, BITS_PER_UNIT);
1083 emit_block_move (gen_rtx_MEM (BLKmode, dest),
1084 gen_rtx_MEM (BLKmode, incoming_args),
1085 argsize, PARM_BOUNDARY);
1087 /* Refer to the argument block. */
1089 arguments = gen_rtx_MEM (BLKmode, arguments);
1091 /* Walk past the arg-pointer and structure value address. */
1092 size = GET_MODE_SIZE (Pmode);
1093 if (struct_value_rtx)
1094 size += GET_MODE_SIZE (Pmode);
1096 /* Restore each of the registers previously saved. Make USE insns
1097 for each of these registers for use in making the call. */
1098 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1099 if ((mode = apply_args_mode[regno]) != VOIDmode)
1101 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
1102 if (size % align != 0)
1103 size = CEIL (size, align) * align;
1104 reg = gen_rtx_REG (mode, regno);
1105 emit_move_insn (reg, adjust_address (arguments, mode, size));
1106 use_reg (&call_fusage, reg);
1107 size += GET_MODE_SIZE (mode);
1110 /* Restore the structure value address unless this is passed as an
1111 "invisible" first argument. */
1112 size = GET_MODE_SIZE (Pmode);
1113 if (struct_value_rtx)
1115 rtx value = gen_reg_rtx (Pmode);
1116 emit_move_insn (value, adjust_address (arguments, Pmode, size));
1117 emit_move_insn (struct_value_rtx, value);
1118 if (GET_CODE (struct_value_rtx) == REG)
1119 use_reg (&call_fusage, struct_value_rtx);
1120 size += GET_MODE_SIZE (Pmode);
1123 /* All arguments and registers used for the call are set up by now! */
1124 function = prepare_call_address (function, NULL_TREE, &call_fusage, 0, 0);
1126 /* Ensure address is valid. SYMBOL_REF is already valid, so no need,
1127 and we don't want to load it into a register as an optimization,
1128 because prepare_call_address already did it if it should be done. */
1129 if (GET_CODE (function) != SYMBOL_REF)
1130 function = memory_address (FUNCTION_MODE, function);
1132 /* Generate the actual call instruction and save the return value. */
1133 #ifdef HAVE_untyped_call
1134 if (HAVE_untyped_call)
1135 emit_call_insn (gen_untyped_call (gen_rtx_MEM (FUNCTION_MODE, function),
1136 result, result_vector (1, result)));
1139 #ifdef HAVE_call_value
1140 if (HAVE_call_value)
1144 /* Locate the unique return register. It is not possible to
1145 express a call that sets more than one return register using
1146 call_value; use untyped_call for that. In fact, untyped_call
1147 only needs to save the return registers in the given block. */
1148 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1149 if ((mode = apply_result_mode[regno]) != VOIDmode)
1152 abort (); /* HAVE_untyped_call required. */
1153 valreg = gen_rtx_REG (mode, regno);
1156 emit_call_insn (GEN_CALL_VALUE (valreg,
1157 gen_rtx_MEM (FUNCTION_MODE, function),
1158 const0_rtx, NULL_RTX, const0_rtx));
1160 emit_move_insn (adjust_address (result, GET_MODE (valreg), 0), valreg);
1166 /* Find the CALL insn we just emitted. */
1167 for (call_insn = get_last_insn ();
1168 call_insn && GET_CODE (call_insn) != CALL_INSN;
1169 call_insn = PREV_INSN (call_insn))
1175 /* Put the register usage information on the CALL. If there is already
1176 some usage information, put ours at the end. */
1177 if (CALL_INSN_FUNCTION_USAGE (call_insn))
1181 for (link = CALL_INSN_FUNCTION_USAGE (call_insn); XEXP (link, 1) != 0;
1182 link = XEXP (link, 1))
1185 XEXP (link, 1) = call_fusage;
1188 CALL_INSN_FUNCTION_USAGE (call_insn) = call_fusage;
1190 /* Restore the stack. */
1191 #ifdef HAVE_save_stack_nonlocal
1192 if (HAVE_save_stack_nonlocal)
1193 emit_stack_restore (SAVE_NONLOCAL, old_stack_level, NULL_RTX);
1196 emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX);
1200 /* Return the address of the result block. */
1201 return copy_addr_to_reg (XEXP (result, 0));
1204 /* Perform an untyped return. */
1207 expand_builtin_return (result)
1210 int size, align, regno;
1211 enum machine_mode mode;
1213 rtx call_fusage = 0;
1215 apply_result_size ();
1216 result = gen_rtx_MEM (BLKmode, result);
1218 #ifdef HAVE_untyped_return
1219 if (HAVE_untyped_return)
1221 emit_jump_insn (gen_untyped_return (result, result_vector (0, result)));
1227 /* Restore the return value and note that each value is used. */
1229 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1230 if ((mode = apply_result_mode[regno]) != VOIDmode)
1232 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
1233 if (size % align != 0)
1234 size = CEIL (size, align) * align;
1235 reg = gen_rtx_REG (mode, INCOMING_REGNO (regno));
1236 emit_move_insn (reg, adjust_address (result, mode, size));
1238 push_to_sequence (call_fusage);
1239 emit_insn (gen_rtx_USE (VOIDmode, reg));
1240 call_fusage = get_insns ();
1242 size += GET_MODE_SIZE (mode);
1245 /* Put the USE insns before the return. */
1246 emit_insns (call_fusage);
1248 /* Return whatever values was restored by jumping directly to the end
1250 expand_null_return ();
1253 /* Used by expand_builtin_classify_type and fold_builtin_classify_type. */
1255 static enum type_class
1256 type_to_class (type)
1259 switch (TREE_CODE (type))
1261 case VOID_TYPE: return void_type_class;
1262 case INTEGER_TYPE: return integer_type_class;
1263 case CHAR_TYPE: return char_type_class;
1264 case ENUMERAL_TYPE: return enumeral_type_class;
1265 case BOOLEAN_TYPE: return boolean_type_class;
1266 case POINTER_TYPE: return pointer_type_class;
1267 case REFERENCE_TYPE: return reference_type_class;
1268 case OFFSET_TYPE: return offset_type_class;
1269 case REAL_TYPE: return real_type_class;
1270 case COMPLEX_TYPE: return complex_type_class;
1271 case FUNCTION_TYPE: return function_type_class;
1272 case METHOD_TYPE: return method_type_class;
1273 case RECORD_TYPE: return record_type_class;
1275 case QUAL_UNION_TYPE: return union_type_class;
1276 case ARRAY_TYPE: return (TYPE_STRING_FLAG (type)
1277 ? string_type_class : array_type_class);
1278 case SET_TYPE: return set_type_class;
1279 case FILE_TYPE: return file_type_class;
1280 case LANG_TYPE: return lang_type_class;
1281 default: return no_type_class;
1285 /* Expand a call to __builtin_classify_type with arguments found in
1289 expand_builtin_classify_type (arglist)
1293 return GEN_INT (type_to_class (TREE_TYPE (TREE_VALUE (arglist))));
1294 return GEN_INT (no_type_class);
1297 /* Expand expression EXP, which is a call to __builtin_constant_p. */
1300 expand_builtin_constant_p (exp)
1303 tree arglist = TREE_OPERAND (exp, 1);
1304 enum machine_mode value_mode = TYPE_MODE (TREE_TYPE (exp));
1309 arglist = TREE_VALUE (arglist);
1311 /* We have taken care of the easy cases during constant folding. This
1312 case is not obvious, so emit (constant_p_rtx (ARGLIST)) and let CSE get a
1313 chance to see if it can deduce whether ARGLIST is constant. */
1315 tmp = expand_expr (arglist, NULL_RTX, VOIDmode, 0);
1316 tmp = gen_rtx_CONSTANT_P_RTX (value_mode, tmp);
1320 /* Expand a call to one of the builtin math functions (sin, cos, or sqrt).
1321 Return 0 if a normal call should be emitted rather than expanding the
1322 function in-line. EXP is the expression that is a call to the builtin
1323 function; if convenient, the result should be placed in TARGET.
1324 SUBTARGET may be used as the target for computing one of EXP's operands. */
1327 expand_builtin_mathfn (exp, target, subtarget)
1329 rtx target, subtarget;
1331 optab builtin_optab;
1333 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
1334 tree arglist = TREE_OPERAND (exp, 1);
1336 if (!validate_arglist (arglist, REAL_TYPE, VOID_TYPE))
1339 /* Stabilize and compute the argument. */
1340 if (TREE_CODE (TREE_VALUE (arglist)) != VAR_DECL
1341 && TREE_CODE (TREE_VALUE (arglist)) != PARM_DECL)
1343 exp = copy_node (exp);
1344 TREE_OPERAND (exp, 1) = arglist;
1345 /* Wrap the computation of the argument in a SAVE_EXPR. That
1346 way, if we need to expand the argument again (as in the
1347 flag_errno_math case below where we cannot directly set
1348 errno), we will not perform side-effects more than once.
1349 Note that here we're mutating the original EXP as well as the
1350 copy; that's the right thing to do in case the original EXP
1351 is expanded later. */
1352 TREE_VALUE (arglist) = save_expr (TREE_VALUE (arglist));
1353 arglist = copy_node (arglist);
1355 op0 = expand_expr (TREE_VALUE (arglist), subtarget, VOIDmode, 0);
1357 /* Make a suitable register to place result in. */
1358 target = gen_reg_rtx (TYPE_MODE (TREE_TYPE (exp)));
1363 switch (DECL_FUNCTION_CODE (fndecl))
1368 builtin_optab = sin_optab; break;
1372 builtin_optab = cos_optab; break;
1373 case BUILT_IN_FSQRT:
1374 case BUILT_IN_SQRTF:
1375 case BUILT_IN_SQRTL:
1376 builtin_optab = sqrt_optab; break;
1381 /* Compute into TARGET.
1382 Set TARGET to wherever the result comes back. */
1383 target = expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist))),
1384 builtin_optab, op0, target, 0);
1386 /* If we were unable to expand via the builtin, stop the
1387 sequence (without outputting the insns) and return 0, causing
1388 a call to the library function. */
1395 /* If errno must be maintained and if we are not allowing unsafe
1396 math optimizations, check the result. */
1398 if (flag_errno_math && ! flag_unsafe_math_optimizations)
1402 /* Don't define the builtin FP instructions
1403 if your machine is not IEEE. */
1404 if (TARGET_FLOAT_FORMAT != IEEE_FLOAT_FORMAT)
1407 lab1 = gen_label_rtx ();
1409 /* Test the result; if it is NaN, set errno=EDOM because
1410 the argument was not in the domain. */
1411 emit_cmp_and_jump_insns (target, target, EQ, 0, GET_MODE (target),
1416 #ifdef GEN_ERRNO_RTX
1417 rtx errno_rtx = GEN_ERRNO_RTX;
1420 = gen_rtx_MEM (word_mode, gen_rtx_SYMBOL_REF (Pmode, "errno"));
1423 emit_move_insn (errno_rtx, GEN_INT (TARGET_EDOM));
1426 /* We can't set errno=EDOM directly; let the library call do it.
1427 Pop the arguments right away in case the call gets deleted. */
1429 expand_call (exp, target, 0);
1436 /* Output the entire sequence. */
1437 insns = get_insns ();
1444 /* Expand expression EXP which is a call to the strlen builtin. Return 0
1445 if we failed the caller should emit a normal call, otherwise
1446 try to get the result in TARGET, if convenient. */
1449 expand_builtin_strlen (exp, target)
1453 tree arglist = TREE_OPERAND (exp, 1);
1454 enum machine_mode value_mode = TYPE_MODE (TREE_TYPE (exp));
1456 if (!validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
1461 tree src = TREE_VALUE (arglist);
1464 = get_pointer_alignment (src, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
1466 rtx result, src_reg, char_rtx, before_strlen;
1467 enum machine_mode insn_mode = value_mode, char_mode;
1468 enum insn_code icode = CODE_FOR_nothing;
1470 /* If SRC is not a pointer type, don't do this operation inline. */
1474 /* Bail out if we can't compute strlen in the right mode. */
1475 while (insn_mode != VOIDmode)
1477 icode = strlen_optab->handlers[(int) insn_mode].insn_code;
1478 if (icode != CODE_FOR_nothing)
1481 insn_mode = GET_MODE_WIDER_MODE (insn_mode);
1483 if (insn_mode == VOIDmode)
1486 /* Make a place to write the result of the instruction. */
1489 && GET_CODE (result) == REG
1490 && GET_MODE (result) == insn_mode
1491 && REGNO (result) >= FIRST_PSEUDO_REGISTER))
1492 result = gen_reg_rtx (insn_mode);
1494 /* Make a place to hold the source address. We will not expand
1495 the actual source until we are sure that the expansion will
1496 not fail -- there are trees that cannot be expanded twice. */
1497 src_reg = gen_reg_rtx (Pmode);
1499 /* Mark the beginning of the strlen sequence so we can emit the
1500 source operand later. */
1501 before_strlen = get_last_insn();
1503 /* Check the string is readable and has an end. */
1504 if (current_function_check_memory_usage)
1505 emit_library_call (chkr_check_str_libfunc, LCT_CONST_MAKE_BLOCK,
1506 VOIDmode, 2, src_reg, Pmode,
1507 GEN_INT (MEMORY_USE_RO),
1508 TYPE_MODE (integer_type_node));
1510 char_rtx = const0_rtx;
1511 char_mode = insn_data[(int) icode].operand[2].mode;
1512 if (! (*insn_data[(int) icode].operand[2].predicate) (char_rtx,
1514 char_rtx = copy_to_mode_reg (char_mode, char_rtx);
1516 pat = GEN_FCN (icode) (result, gen_rtx_MEM (BLKmode, src_reg),
1517 char_rtx, GEN_INT (align));
1522 /* Now that we are assured of success, expand the source. */
1524 pat = memory_address (BLKmode,
1525 expand_expr (src, src_reg, ptr_mode, EXPAND_SUM));
1527 emit_move_insn (src_reg, pat);
1528 pat = gen_sequence ();
1532 emit_insn_after (pat, before_strlen);
1534 emit_insn_before (pat, get_insns ());
1536 /* Return the value in the proper mode for this function. */
1537 if (GET_MODE (result) == value_mode)
1539 else if (target != 0)
1540 convert_move (target, result, 0);
1542 target = convert_to_mode (value_mode, result, 0);
1548 /* Expand a call to the strstr builtin. Return 0 if we failed the
1549 caller should emit a normal call, otherwise try to get the result
1550 in TARGET, if convenient (and in mode MODE if that's convenient). */
1553 expand_builtin_strstr (arglist, target, mode)
1556 enum machine_mode mode;
1558 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE)
1559 || current_function_check_memory_usage)
1563 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1565 const char *p1, *p2;
1574 const char *r = strstr (p1, p2);
1579 /* Return an offset into the constant string argument. */
1580 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1581 s1, ssize_int (r - p1))),
1582 target, mode, EXPAND_NORMAL);
1586 return expand_expr (s1, target, mode, EXPAND_NORMAL);
1591 fn = built_in_decls[BUILT_IN_STRCHR];
1595 /* New argument list transforming strstr(s1, s2) to
1596 strchr(s1, s2[0]). */
1598 build_tree_list (NULL_TREE, build_int_2 (p2[0], 0));
1599 arglist = tree_cons (NULL_TREE, s1, arglist);
1600 return expand_expr (build_function_call_expr (fn, arglist),
1601 target, mode, EXPAND_NORMAL);
1605 /* Expand a call to the strchr builtin. Return 0 if we failed the
1606 caller should emit a normal call, otherwise try to get the result
1607 in TARGET, if convenient (and in mode MODE if that's convenient). */
1610 expand_builtin_strchr (arglist, target, mode)
1613 enum machine_mode mode;
1615 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE)
1616 || current_function_check_memory_usage)
1620 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1623 if (TREE_CODE (s2) != INTEGER_CST)
1632 if (target_char_cast (s2, &c))
1640 /* Return an offset into the constant string argument. */
1641 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1642 s1, ssize_int (r - p1))),
1643 target, mode, EXPAND_NORMAL);
1646 /* FIXME: Should use here strchrM optab so that ports can optimize
1652 /* Expand a call to the strrchr builtin. Return 0 if we failed the
1653 caller should emit a normal call, otherwise try to get the result
1654 in TARGET, if convenient (and in mode MODE if that's convenient). */
1657 expand_builtin_strrchr (arglist, target, mode)
1660 enum machine_mode mode;
1662 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE)
1663 || current_function_check_memory_usage)
1667 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1671 if (TREE_CODE (s2) != INTEGER_CST)
1680 if (target_char_cast (s2, &c))
1683 r = strrchr (p1, c);
1688 /* Return an offset into the constant string argument. */
1689 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1690 s1, ssize_int (r - p1))),
1691 target, mode, EXPAND_NORMAL);
1694 if (! integer_zerop (s2))
1697 fn = built_in_decls[BUILT_IN_STRCHR];
1701 /* Transform strrchr(s1, '\0') to strchr(s1, '\0'). */
1702 return expand_expr (build_function_call_expr (fn, arglist),
1703 target, mode, EXPAND_NORMAL);
1707 /* Expand a call to the strpbrk builtin. Return 0 if we failed the
1708 caller should emit a normal call, otherwise try to get the result
1709 in TARGET, if convenient (and in mode MODE if that's convenient). */
1712 expand_builtin_strpbrk (arglist, target, mode)
1715 enum machine_mode mode;
1717 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE)
1718 || current_function_check_memory_usage)
1722 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1724 const char *p1, *p2;
1733 const char *r = strpbrk (p1, p2);
1738 /* Return an offset into the constant string argument. */
1739 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1740 s1, ssize_int (r - p1))),
1741 target, mode, EXPAND_NORMAL);
1746 /* strpbrk(x, "") == NULL.
1747 Evaluate and ignore the arguments in case they had
1749 expand_expr (s1, const0_rtx, VOIDmode, EXPAND_NORMAL);
1754 return 0; /* Really call strpbrk. */
1756 fn = built_in_decls[BUILT_IN_STRCHR];
1760 /* New argument list transforming strpbrk(s1, s2) to
1761 strchr(s1, s2[0]). */
1763 build_tree_list (NULL_TREE, build_int_2 (p2[0], 0));
1764 arglist = tree_cons (NULL_TREE, s1, arglist);
1765 return expand_expr (build_function_call_expr (fn, arglist),
1766 target, mode, EXPAND_NORMAL);
1770 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
1771 bytes from constant string DATA + OFFSET and return it as target
1775 builtin_memcpy_read_str (data, offset, mode)
1777 HOST_WIDE_INT offset;
1778 enum machine_mode mode;
1780 const char *str = (const char *) data;
1783 || ((unsigned HOST_WIDE_INT) offset + GET_MODE_SIZE (mode)
1784 > strlen (str) + 1))
1785 abort (); /* Attempt to read past the end of constant string. */
1787 return c_readstr (str + offset, mode);
1790 /* Expand a call to the memcpy builtin, with arguments in ARGLIST. */
1793 expand_builtin_memcpy (arglist)
1796 if (!validate_arglist (arglist,
1797 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
1801 tree dest = TREE_VALUE (arglist);
1802 tree src = TREE_VALUE (TREE_CHAIN (arglist));
1803 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
1804 const char *src_str;
1806 unsigned int src_align = get_pointer_alignment (src, BIGGEST_ALIGNMENT);
1807 unsigned int dest_align
1808 = get_pointer_alignment (dest, BIGGEST_ALIGNMENT);
1809 rtx dest_mem, src_mem, dest_addr, len_rtx;
1811 /* If either SRC or DEST is not a pointer type, don't do
1812 this operation in-line. */
1813 if (src_align == 0 || dest_align == 0)
1816 dest_mem = get_memory_rtx (dest);
1817 len_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
1818 src_str = c_getstr (src);
1820 /* If SRC is a string constant and block move would be done
1821 by pieces, we can avoid loading the string from memory
1822 and only stored the computed constants. */
1824 && !current_function_check_memory_usage
1825 && GET_CODE (len_rtx) == CONST_INT
1826 && (unsigned HOST_WIDE_INT) INTVAL (len_rtx) <= strlen (src_str) + 1
1827 && can_store_by_pieces (INTVAL (len_rtx), builtin_memcpy_read_str,
1828 (PTR) src_str, dest_align))
1830 store_by_pieces (dest_mem, INTVAL (len_rtx),
1831 builtin_memcpy_read_str,
1832 (PTR) src_str, dest_align);
1833 return force_operand (XEXP (dest_mem, 0), NULL_RTX);
1836 src_mem = get_memory_rtx (src);
1838 /* Just copy the rights of SRC to the rights of DEST. */
1839 if (current_function_check_memory_usage)
1840 emit_library_call (chkr_copy_bitmap_libfunc, LCT_CONST_MAKE_BLOCK,
1841 VOIDmode, 3, XEXP (dest_mem, 0), Pmode,
1842 XEXP (src_mem, 0), Pmode,
1843 len_rtx, TYPE_MODE (sizetype));
1845 /* Copy word part most expediently. */
1847 = emit_block_move (dest_mem, src_mem, len_rtx,
1848 MIN (src_align, dest_align));
1851 dest_addr = force_operand (XEXP (dest_mem, 0), NULL_RTX);
1857 /* Expand expression EXP, which is a call to the strcpy builtin. Return 0
1858 if we failed the caller should emit a normal call. */
1861 expand_builtin_strcpy (exp)
1864 tree arglist = TREE_OPERAND (exp, 1);
1867 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
1871 tree len = c_strlen (TREE_VALUE (TREE_CHAIN (arglist)));
1876 len = size_binop (PLUS_EXPR, len, ssize_int (1));
1877 chainon (arglist, build_tree_list (NULL_TREE, len));
1880 result = expand_builtin_memcpy (arglist);
1883 TREE_CHAIN (TREE_CHAIN (arglist)) = 0;
1887 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
1888 bytes from constant string DATA + OFFSET and return it as target
1892 builtin_strncpy_read_str (data, offset, mode)
1894 HOST_WIDE_INT offset;
1895 enum machine_mode mode;
1897 const char *str = (const char *) data;
1899 if ((unsigned HOST_WIDE_INT) offset > strlen (str))
1902 return c_readstr (str + offset, mode);
1905 /* Expand expression EXP, which is a call to the strncpy builtin. Return 0
1906 if we failed the caller should emit a normal call. */
1909 expand_builtin_strncpy (arglist, target, mode)
1912 enum machine_mode mode;
1914 if (!validate_arglist (arglist,
1915 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
1919 tree slen = c_strlen (TREE_VALUE (TREE_CHAIN (arglist)));
1920 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
1922 /* We must be passed a constant len parameter. */
1923 if (TREE_CODE (len) != INTEGER_CST)
1926 /* If the len parameter is zero, return the dst parameter. */
1927 if (compare_tree_int (len, 0) == 0)
1929 /* Evaluate and ignore the src argument in case it has
1931 expand_expr (TREE_VALUE (TREE_CHAIN (arglist)), const0_rtx,
1932 VOIDmode, EXPAND_NORMAL);
1933 /* Return the dst parameter. */
1934 return expand_expr (TREE_VALUE (arglist), target, mode,
1938 /* Now, we must be passed a constant src ptr parameter. */
1939 if (slen == 0 || TREE_CODE (slen) != INTEGER_CST)
1942 slen = size_binop (PLUS_EXPR, slen, ssize_int (1));
1944 /* We're required to pad with trailing zeros if the requested
1945 len is greater than strlen(s2)+1. In that case try to
1946 use store_by_pieces, if it fails, punt. */
1947 if (tree_int_cst_lt (slen, len))
1949 tree dest = TREE_VALUE (arglist);
1950 unsigned int dest_align
1951 = get_pointer_alignment (dest, BIGGEST_ALIGNMENT);
1952 const char *p = c_getstr (TREE_VALUE (TREE_CHAIN (arglist)));
1955 if (!p || dest_align == 0 || !host_integerp (len, 1)
1956 || !can_store_by_pieces (tree_low_cst (len, 1),
1957 builtin_strncpy_read_str,
1958 (PTR) p, dest_align))
1961 dest_mem = get_memory_rtx (dest);
1962 store_by_pieces (dest_mem, tree_low_cst (len, 1),
1963 builtin_strncpy_read_str,
1964 (PTR) p, dest_align);
1965 return force_operand (XEXP (dest_mem, 0), NULL_RTX);
1968 /* OK transform into builtin memcpy. */
1969 return expand_builtin_memcpy (arglist);
1973 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
1974 bytes from constant string DATA + OFFSET and return it as target
1978 builtin_memset_read_str (data, offset, mode)
1980 HOST_WIDE_INT offset ATTRIBUTE_UNUSED;
1981 enum machine_mode mode;
1983 const char *c = (const char *) data;
1984 char *p = alloca (GET_MODE_SIZE (mode));
1986 memset (p, *c, GET_MODE_SIZE (mode));
1988 return c_readstr (p, mode);
1991 /* Expand expression EXP, which is a call to the memset builtin. Return 0
1992 if we failed the caller should emit a normal call. */
1995 expand_builtin_memset (exp)
1998 tree arglist = TREE_OPERAND (exp, 1);
2000 if (!validate_arglist (arglist,
2001 POINTER_TYPE, INTEGER_TYPE, INTEGER_TYPE, VOID_TYPE))
2005 tree dest = TREE_VALUE (arglist);
2006 tree val = TREE_VALUE (TREE_CHAIN (arglist));
2007 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2010 unsigned int dest_align
2011 = get_pointer_alignment (dest, BIGGEST_ALIGNMENT);
2012 rtx dest_mem, dest_addr, len_rtx;
2014 /* If DEST is not a pointer type, don't do this
2015 operation in-line. */
2016 if (dest_align == 0)
2019 if (TREE_CODE (val) != INTEGER_CST)
2022 if (target_char_cast (val, &c))
2027 if (!host_integerp (len, 1))
2029 if (current_function_check_memory_usage
2030 || !can_store_by_pieces (tree_low_cst (len, 1),
2031 builtin_memset_read_str,
2032 (PTR) &c, dest_align))
2035 dest_mem = get_memory_rtx (dest);
2036 store_by_pieces (dest_mem, tree_low_cst (len, 1),
2037 builtin_memset_read_str,
2038 (PTR) &c, dest_align);
2039 return force_operand (XEXP (dest_mem, 0), NULL_RTX);
2042 len_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
2044 dest_mem = get_memory_rtx (dest);
2046 /* Just check DST is writable and mark it as readable. */
2047 if (current_function_check_memory_usage)
2048 emit_library_call (chkr_check_addr_libfunc, LCT_CONST_MAKE_BLOCK,
2049 VOIDmode, 3, XEXP (dest_mem, 0), Pmode,
2050 len_rtx, TYPE_MODE (sizetype),
2051 GEN_INT (MEMORY_USE_WO),
2052 TYPE_MODE (integer_type_node));
2055 dest_addr = clear_storage (dest_mem, len_rtx, dest_align);
2058 dest_addr = force_operand (XEXP (dest_mem, 0), NULL_RTX);
2064 /* Expand expression EXP, which is a call to the bzero builtin. Return 0
2065 if we failed the caller should emit a normal call. */
2068 expand_builtin_bzero (exp)
2071 tree arglist = TREE_OPERAND (exp, 1);
2072 tree dest, size, newarglist;
2075 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2078 dest = TREE_VALUE (arglist);
2079 size = TREE_VALUE (TREE_CHAIN (arglist));
2081 /* New argument list transforming bzero(ptr x, int y) to
2082 memset(ptr x, int 0, size_t y). */
2084 newarglist = build_tree_list (NULL_TREE, convert (sizetype, size));
2085 newarglist = tree_cons (NULL_TREE, integer_zero_node, newarglist);
2086 newarglist = tree_cons (NULL_TREE, dest, newarglist);
2088 TREE_OPERAND (exp, 1) = newarglist;
2089 result = expand_builtin_memset(exp);
2091 /* Always restore the original arguments. */
2092 TREE_OPERAND (exp, 1) = arglist;
2097 #ifdef HAVE_cmpstrsi
2099 /* Expand expression EXP, which is a call to the memcmp or the strcmp builtin.
2100 ARGLIST is the argument list for this call. Return 0 if we failed and the
2101 caller should emit a normal call, otherwise try to get the result in
2102 TARGET, if convenient. */
2105 expand_builtin_memcmp (exp, arglist, target)
2110 /* If we need to check memory accesses, call the library function. */
2111 if (current_function_check_memory_usage)
2114 if (!validate_arglist (arglist,
2115 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2119 enum machine_mode mode;
2120 tree arg1 = TREE_VALUE (arglist);
2121 tree arg2 = TREE_VALUE (TREE_CHAIN (arglist));
2122 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2123 rtx arg1_rtx, arg2_rtx, arg3_rtx;
2128 = get_pointer_alignment (arg1, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
2130 = get_pointer_alignment (arg2, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
2131 enum machine_mode insn_mode
2132 = insn_data[(int) CODE_FOR_cmpstrsi].operand[0].mode;
2134 /* If we don't have POINTER_TYPE, call the function. */
2135 if (arg1_align == 0 || arg2_align == 0)
2138 /* Make a place to write the result of the instruction. */
2141 && GET_CODE (result) == REG && GET_MODE (result) == insn_mode
2142 && REGNO (result) >= FIRST_PSEUDO_REGISTER))
2143 result = gen_reg_rtx (insn_mode);
2145 arg1_rtx = get_memory_rtx (arg1);
2146 arg2_rtx = get_memory_rtx (arg2);
2147 arg3_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
2151 insn = gen_cmpstrsi (result, arg1_rtx, arg2_rtx, arg3_rtx,
2152 GEN_INT (MIN (arg1_align, arg2_align)));
2157 emit_library_call_value (memcmp_libfunc, result, LCT_PURE_MAKE_BLOCK,
2158 TYPE_MODE (integer_type_node), 3,
2159 XEXP (arg1_rtx, 0), Pmode,
2160 XEXP (arg2_rtx, 0), Pmode,
2161 convert_to_mode (TYPE_MODE (sizetype), arg3_rtx,
2162 TREE_UNSIGNED (sizetype)),
2163 TYPE_MODE (sizetype));
2165 /* Return the value in the proper mode for this function. */
2166 mode = TYPE_MODE (TREE_TYPE (exp));
2167 if (GET_MODE (result) == mode)
2169 else if (target != 0)
2171 convert_move (target, result, 0);
2175 return convert_to_mode (mode, result, 0);
2180 /* Expand expression EXP, which is a call to the strcmp builtin. Return 0
2181 if we failed the caller should emit a normal call, otherwise try to get
2182 the result in TARGET, if convenient. */
2185 expand_builtin_strcmp (exp, target, mode)
2188 enum machine_mode mode;
2190 tree arglist = TREE_OPERAND (exp, 1);
2192 const char *p1, *p2;
2194 /* If we need to check memory accesses, call the library function. */
2195 if (current_function_check_memory_usage)
2198 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2201 arg1 = TREE_VALUE (arglist);
2202 arg2 = TREE_VALUE (TREE_CHAIN (arglist));
2204 p1 = c_getstr (arg1);
2205 p2 = c_getstr (arg2);
2209 const int i = strcmp (p1, p2);
2210 return (i < 0 ? constm1_rtx : (i > 0 ? const1_rtx : const0_rtx));
2213 /* If either arg is "", return an expression corresponding to
2214 (*(const unsigned char*)arg1 - (const unsigned char*)arg2). */
2215 if ((p1 && *p1 == '\0') || (p2 && *p2 == '\0'))
2217 tree cst_uchar_node = build_type_variant (unsigned_char_type_node, 1, 0);
2218 tree cst_uchar_ptr_node = build_pointer_type (cst_uchar_node);
2220 fold (build1 (CONVERT_EXPR, integer_type_node,
2221 build1 (INDIRECT_REF, cst_uchar_node,
2222 build1 (NOP_EXPR, cst_uchar_ptr_node, arg1))));
2224 fold (build1 (CONVERT_EXPR, integer_type_node,
2225 build1 (INDIRECT_REF, cst_uchar_node,
2226 build1 (NOP_EXPR, cst_uchar_ptr_node, arg2))));
2227 tree result = fold (build (MINUS_EXPR, integer_type_node, ind1, ind2));
2228 return expand_expr (result, target, mode, EXPAND_NORMAL);
2231 #ifdef HAVE_cmpstrsi
2232 if (! HAVE_cmpstrsi)
2236 tree len = c_strlen (arg1);
2237 tree len2 = c_strlen (arg2);
2241 len = size_binop (PLUS_EXPR, ssize_int (1), len);
2244 len2 = size_binop (PLUS_EXPR, ssize_int (1), len2);
2246 /* If we don't have a constant length for the first, use the length
2247 of the second, if we know it. We don't require a constant for
2248 this case; some cost analysis could be done if both are available
2249 but neither is constant. For now, assume they're equally cheap
2250 unless one has side effects.
2252 If both strings have constant lengths, use the smaller. This
2253 could arise if optimization results in strcpy being called with
2254 two fixed strings, or if the code was machine-generated. We should
2255 add some code to the `memcmp' handler below to deal with such
2256 situations, someday. */
2258 if (!len || TREE_CODE (len) != INTEGER_CST)
2260 if (len2 && !TREE_SIDE_EFFECTS (len2))
2265 else if (len2 && TREE_CODE (len2) == INTEGER_CST
2266 && tree_int_cst_lt (len2, len))
2269 /* If both arguments have side effects, we cannot optimize. */
2270 if (TREE_SIDE_EFFECTS (len))
2273 chainon (arglist, build_tree_list (NULL_TREE, len));
2274 result = expand_builtin_memcmp (exp, arglist, target);
2276 TREE_CHAIN (TREE_CHAIN (arglist)) = 0;
2285 /* Expand expression EXP, which is a call to the strncmp builtin. Return 0
2286 if we failed the caller should emit a normal call, otherwise try to get
2287 the result in TARGET, if convenient. */
2290 expand_builtin_strncmp (exp, target, mode)
2293 enum machine_mode mode;
2295 tree arglist = TREE_OPERAND (exp, 1);
2296 tree arg1, arg2, arg3;
2297 const char *p1, *p2;
2299 /* If we need to check memory accesses, call the library function. */
2300 if (current_function_check_memory_usage)
2303 if (!validate_arglist (arglist,
2304 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2307 arg1 = TREE_VALUE (arglist);
2308 arg2 = TREE_VALUE (TREE_CHAIN (arglist));
2309 arg3 = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2311 /* If the len parameter is zero, return zero. */
2312 if (host_integerp (arg3, 1) && tree_low_cst (arg3, 1) == 0)
2314 /* Evaluate and ignore arg1 and arg2 in case they have
2316 expand_expr (arg1, const0_rtx, VOIDmode, EXPAND_NORMAL);
2317 expand_expr (arg2, const0_rtx, VOIDmode, EXPAND_NORMAL);
2321 p1 = c_getstr (arg1);
2322 p2 = c_getstr (arg2);
2324 /* If all arguments are constant, evaluate at compile-time. */
2325 if (host_integerp (arg3, 1) && p1 && p2)
2327 const int r = strncmp (p1, p2, tree_low_cst (arg3, 1));
2328 return (r < 0 ? constm1_rtx : (r > 0 ? const1_rtx : const0_rtx));
2331 /* If len == 1 or (either string parameter is "" and (len >= 1)),
2332 return (*(const u_char*)arg1 - *(const u_char*)arg2). */
2333 if (host_integerp (arg3, 1)
2334 && (tree_low_cst (arg3, 1) == 1
2335 || (tree_low_cst (arg3, 1) > 1
2336 && ((p1 && *p1 == '\0') || (p2 && *p2 == '\0')))))
2338 tree cst_uchar_node = build_type_variant (unsigned_char_type_node, 1, 0);
2339 tree cst_uchar_ptr_node = build_pointer_type (cst_uchar_node);
2341 fold (build1 (CONVERT_EXPR, integer_type_node,
2342 build1 (INDIRECT_REF, cst_uchar_node,
2343 build1 (NOP_EXPR, cst_uchar_ptr_node, arg1))));
2345 fold (build1 (CONVERT_EXPR, integer_type_node,
2346 build1 (INDIRECT_REF, cst_uchar_node,
2347 build1 (NOP_EXPR, cst_uchar_ptr_node, arg2))));
2348 tree result = fold (build (MINUS_EXPR, integer_type_node, ind1, ind2));
2349 return expand_expr (result, target, mode, EXPAND_NORMAL);
2352 #ifdef HAVE_cmpstrsi
2353 /* If c_strlen can determine an expression for one of the string
2354 lengths, and it doesn't have side effects, then call
2355 expand_builtin_memcmp() using length MIN(strlen(string)+1, arg3). */
2358 tree newarglist, len = 0;
2360 /* Perhaps one of the strings is really constant, if so prefer
2361 that constant length over the other string's length. */
2363 len = c_strlen (arg1);
2365 len = c_strlen (arg2);
2367 /* If we still don't have a len, try either string arg as long
2368 as they don't have side effects. */
2369 if (!len && !TREE_SIDE_EFFECTS (arg1))
2370 len = c_strlen (arg1);
2371 if (!len && !TREE_SIDE_EFFECTS (arg2))
2372 len = c_strlen (arg2);
2373 /* If we still don't have a length, punt. */
2377 /* Add one to the string length. */
2378 len = fold (size_binop (PLUS_EXPR, len, ssize_int (1)));
2380 /* The actual new length parameter is MIN(len,arg3). */
2381 len = fold (build (MIN_EXPR, TREE_TYPE (len), len, arg3));
2383 newarglist = build_tree_list (NULL_TREE, len);
2384 newarglist = tree_cons (NULL_TREE, arg2, newarglist);
2385 newarglist = tree_cons (NULL_TREE, arg1, newarglist);
2386 return expand_builtin_memcmp (exp, newarglist, target);
2393 /* Expand expression EXP, which is a call to the strcat builtin.
2394 Return 0 if we failed the caller should emit a normal call,
2395 otherwise try to get the result in TARGET, if convenient. */
2398 expand_builtin_strcat (arglist, target, mode)
2401 enum machine_mode mode;
2403 /* If we need to check memory accesses, call the library function. */
2404 if (current_function_check_memory_usage)
2407 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2411 tree dst = TREE_VALUE (arglist),
2412 src = TREE_VALUE (TREE_CHAIN (arglist));
2413 const char *p = c_getstr (src);
2415 /* If the string length is zero, return the dst parameter. */
2416 if (p && *p == '\0')
2417 return expand_expr (dst, target, mode, EXPAND_NORMAL);
2423 /* Expand expression EXP, which is a call to the strncat builtin.
2424 Return 0 if we failed the caller should emit a normal call,
2425 otherwise try to get the result in TARGET, if convenient. */
2428 expand_builtin_strncat (arglist, target, mode)
2431 enum machine_mode mode;
2433 /* If we need to check memory accesses, call the library function. */
2434 if (current_function_check_memory_usage)
2437 if (!validate_arglist (arglist,
2438 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2442 tree dst = TREE_VALUE (arglist),
2443 src = TREE_VALUE (TREE_CHAIN (arglist)),
2444 len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2445 const char *p = c_getstr (src);
2447 /* If the requested length is zero, or the src parameter string
2448 length is zero, return the dst parameter. */
2449 if ((TREE_CODE (len) == INTEGER_CST && compare_tree_int (len, 0) == 0)
2450 || (p && *p == '\0'))
2452 /* Evaluate and ignore the src and len parameters in case
2453 they have side-effects. */
2454 expand_expr (src, const0_rtx, VOIDmode, EXPAND_NORMAL);
2455 expand_expr (len, const0_rtx, VOIDmode, EXPAND_NORMAL);
2456 return expand_expr (dst, target, mode, EXPAND_NORMAL);
2459 /* If the requested len is greater than or equal to the string
2460 length, call strcat. */
2461 if (TREE_CODE (len) == INTEGER_CST && p
2462 && compare_tree_int (len, strlen (p)) >= 0)
2465 tree_cons (NULL_TREE, dst, build_tree_list (NULL_TREE, src)),
2466 fn = built_in_decls[BUILT_IN_STRCAT];
2468 /* If the replacement _DECL isn't initialized, don't do the
2473 return expand_expr (build_function_call_expr (fn, newarglist),
2474 target, mode, EXPAND_NORMAL);
2480 /* Expand expression EXP, which is a call to the strspn builtin.
2481 Return 0 if we failed the caller should emit a normal call,
2482 otherwise try to get the result in TARGET, if convenient. */
2485 expand_builtin_strspn (arglist, target, mode)
2488 enum machine_mode mode;
2490 /* If we need to check memory accesses, call the library function. */
2491 if (current_function_check_memory_usage)
2494 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2498 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
2499 const char *p1 = c_getstr (s1), *p2 = c_getstr (s2);
2501 /* If both arguments are constants, evaluate at compile-time. */
2504 const size_t r = strspn (p1, p2);
2505 return expand_expr (size_int (r), target, mode, EXPAND_NORMAL);
2508 /* If either argument is "", return 0. */
2509 if ((p1 && *p1 == '\0') || (p2 && *p2 == '\0'))
2511 /* Evaluate and ignore both arguments in case either one has
2513 expand_expr (s1, const0_rtx, VOIDmode, EXPAND_NORMAL);
2514 expand_expr (s2, const0_rtx, VOIDmode, EXPAND_NORMAL);
2521 /* Expand expression EXP, which is a call to the strcspn builtin.
2522 Return 0 if we failed the caller should emit a normal call,
2523 otherwise try to get the result in TARGET, if convenient. */
2526 expand_builtin_strcspn (arglist, target, mode)
2529 enum machine_mode mode;
2531 /* If we need to check memory accesses, call the library function. */
2532 if (current_function_check_memory_usage)
2535 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2539 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
2540 const char *p1 = c_getstr (s1), *p2 = c_getstr (s2);
2542 /* If both arguments are constants, evaluate at compile-time. */
2545 const size_t r = strcspn (p1, p2);
2546 return expand_expr (size_int (r), target, mode, EXPAND_NORMAL);
2549 /* If the first argument is "", return 0. */
2550 if (p1 && *p1 == '\0')
2552 /* Evaluate and ignore argument s2 in case it has
2554 expand_expr (s2, const0_rtx, VOIDmode, EXPAND_NORMAL);
2558 /* If the second argument is "", return __builtin_strlen(s1). */
2559 if (p2 && *p2 == '\0')
2561 tree newarglist = build_tree_list (NULL_TREE, s1),
2562 fn = built_in_decls[BUILT_IN_STRLEN];
2564 /* If the replacement _DECL isn't initialized, don't do the
2569 return expand_expr (build_function_call_expr (fn, newarglist),
2570 target, mode, EXPAND_NORMAL);
2576 /* Expand a call to __builtin_saveregs, generating the result in TARGET,
2577 if that's convenient. */
2580 expand_builtin_saveregs ()
2584 /* Don't do __builtin_saveregs more than once in a function.
2585 Save the result of the first call and reuse it. */
2586 if (saveregs_value != 0)
2587 return saveregs_value;
2589 /* When this function is called, it means that registers must be
2590 saved on entry to this function. So we migrate the call to the
2591 first insn of this function. */
2595 #ifdef EXPAND_BUILTIN_SAVEREGS
2596 /* Do whatever the machine needs done in this case. */
2597 val = EXPAND_BUILTIN_SAVEREGS ();
2599 /* ??? We used to try and build up a call to the out of line function,
2600 guessing about what registers needed saving etc. This became much
2601 harder with __builtin_va_start, since we don't have a tree for a
2602 call to __builtin_saveregs to fall back on. There was exactly one
2603 port (i860) that used this code, and I'm unconvinced it could actually
2604 handle the general case. So we no longer try to handle anything
2605 weird and make the backend absorb the evil. */
2607 error ("__builtin_saveregs not supported by this target");
2614 saveregs_value = val;
2616 /* Put the sequence after the NOTE that starts the function. If this
2617 is inside a SEQUENCE, make the outer-level insn chain current, so
2618 the code is placed at the start of the function. */
2619 push_topmost_sequence ();
2620 emit_insns_after (seq, get_insns ());
2621 pop_topmost_sequence ();
2626 /* __builtin_args_info (N) returns word N of the arg space info
2627 for the current function. The number and meanings of words
2628 is controlled by the definition of CUMULATIVE_ARGS. */
2631 expand_builtin_args_info (exp)
2634 tree arglist = TREE_OPERAND (exp, 1);
2635 int nwords = sizeof (CUMULATIVE_ARGS) / sizeof (int);
2636 int *word_ptr = (int *) ¤t_function_args_info;
2638 /* These are used by the code below that is if 0'ed away */
2640 tree type, elts, result;
2643 if (sizeof (CUMULATIVE_ARGS) % sizeof (int) != 0)
2648 if (!host_integerp (TREE_VALUE (arglist), 0))
2649 error ("argument of `__builtin_args_info' must be constant");
2652 HOST_WIDE_INT wordnum = tree_low_cst (TREE_VALUE (arglist), 0);
2654 if (wordnum < 0 || wordnum >= nwords)
2655 error ("argument of `__builtin_args_info' out of range");
2657 return GEN_INT (word_ptr[wordnum]);
2661 error ("missing argument in `__builtin_args_info'");
2666 for (i = 0; i < nwords; i++)
2667 elts = tree_cons (NULL_TREE, build_int_2 (word_ptr[i], 0));
2669 type = build_array_type (integer_type_node,
2670 build_index_type (build_int_2 (nwords, 0)));
2671 result = build (CONSTRUCTOR, type, NULL_TREE, nreverse (elts));
2672 TREE_CONSTANT (result) = 1;
2673 TREE_STATIC (result) = 1;
2674 result = build1 (INDIRECT_REF, build_pointer_type (type), result);
2675 TREE_CONSTANT (result) = 1;
2676 return expand_expr (result, NULL_RTX, VOIDmode, EXPAND_MEMORY_USE_BAD);
2680 /* Expand ARGLIST, from a call to __builtin_next_arg. */
2683 expand_builtin_next_arg (arglist)
2686 tree fntype = TREE_TYPE (current_function_decl);
2688 if ((TYPE_ARG_TYPES (fntype) == 0
2689 || (TREE_VALUE (tree_last (TYPE_ARG_TYPES (fntype)))
2691 && ! current_function_varargs)
2693 error ("`va_start' used in function with fixed args");
2699 tree last_parm = tree_last (DECL_ARGUMENTS (current_function_decl));
2700 tree arg = TREE_VALUE (arglist);
2702 /* Strip off all nops for the sake of the comparison. This
2703 is not quite the same as STRIP_NOPS. It does more.
2704 We must also strip off INDIRECT_EXPR for C++ reference
2706 while (TREE_CODE (arg) == NOP_EXPR
2707 || TREE_CODE (arg) == CONVERT_EXPR
2708 || TREE_CODE (arg) == NON_LVALUE_EXPR
2709 || TREE_CODE (arg) == INDIRECT_REF)
2710 arg = TREE_OPERAND (arg, 0);
2711 if (arg != last_parm)
2712 warning ("second parameter of `va_start' not last named argument");
2714 else if (! current_function_varargs)
2715 /* Evidently an out of date version of <stdarg.h>; can't validate
2716 va_start's second argument, but can still work as intended. */
2717 warning ("`__builtin_next_arg' called without an argument");
2719 return expand_binop (Pmode, add_optab,
2720 current_function_internal_arg_pointer,
2721 current_function_arg_offset_rtx,
2722 NULL_RTX, 0, OPTAB_LIB_WIDEN);
2725 /* Make it easier for the backends by protecting the valist argument
2726 from multiple evaluations. */
2729 stabilize_va_list (valist, needs_lvalue)
2733 if (TREE_CODE (va_list_type_node) == ARRAY_TYPE)
2735 if (TREE_SIDE_EFFECTS (valist))
2736 valist = save_expr (valist);
2738 /* For this case, the backends will be expecting a pointer to
2739 TREE_TYPE (va_list_type_node), but it's possible we've
2740 actually been given an array (an actual va_list_type_node).
2742 if (TREE_CODE (TREE_TYPE (valist)) == ARRAY_TYPE)
2744 tree p1 = build_pointer_type (TREE_TYPE (va_list_type_node));
2745 tree p2 = build_pointer_type (va_list_type_node);
2747 valist = build1 (ADDR_EXPR, p2, valist);
2748 valist = fold (build1 (NOP_EXPR, p1, valist));
2757 if (! TREE_SIDE_EFFECTS (valist))
2760 pt = build_pointer_type (va_list_type_node);
2761 valist = fold (build1 (ADDR_EXPR, pt, valist));
2762 TREE_SIDE_EFFECTS (valist) = 1;
2765 if (TREE_SIDE_EFFECTS (valist))
2766 valist = save_expr (valist);
2767 valist = fold (build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (valist)),
2774 /* The "standard" implementation of va_start: just assign `nextarg' to
2778 std_expand_builtin_va_start (stdarg_p, valist, nextarg)
2787 /* The dummy named parameter is declared as a 'word' sized
2788 object, but if a 'word' is smaller than an 'int', it would
2789 have been promoted to int when it was added to the arglist. */
2790 int align = PARM_BOUNDARY / BITS_PER_UNIT;
2791 int size = MAX (UNITS_PER_WORD,
2792 GET_MODE_SIZE (TYPE_MODE (integer_type_node)));
2793 int offset = ((size + align - 1) / align) * align;
2794 nextarg = plus_constant (nextarg, -offset);
2797 t = build (MODIFY_EXPR, TREE_TYPE (valist), valist,
2798 make_tree (ptr_type_node, nextarg));
2799 TREE_SIDE_EFFECTS (t) = 1;
2801 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
2804 /* Expand ARGLIST, which from a call to __builtin_stdarg_va_start or
2805 __builtin_varargs_va_start, depending on STDARG_P. */
2808 expand_builtin_va_start (stdarg_p, arglist)
2813 tree chain = arglist, valist;
2816 nextarg = expand_builtin_next_arg (chain = TREE_CHAIN (arglist));
2818 nextarg = expand_builtin_next_arg (NULL_TREE);
2820 if (TREE_CHAIN (chain))
2821 error ("too many arguments to function `va_start'");
2823 valist = stabilize_va_list (TREE_VALUE (arglist), 1);
2825 #ifdef EXPAND_BUILTIN_VA_START
2826 EXPAND_BUILTIN_VA_START (stdarg_p, valist, nextarg);
2828 std_expand_builtin_va_start (stdarg_p, valist, nextarg);
2834 /* The "standard" implementation of va_arg: read the value from the
2835 current (padded) address and increment by the (padded) size. */
2838 std_expand_builtin_va_arg (valist, type)
2842 HOST_WIDE_INT align;
2843 HOST_WIDE_INT rounded_size;
2846 /* Compute the rounded size of the type. */
2847 align = PARM_BOUNDARY / BITS_PER_UNIT;
2848 rounded_size = (((int_size_in_bytes (type) + align - 1) / align) * align);
2852 if (PAD_VARARGS_DOWN)
2854 /* Small args are padded downward. */
2857 = rounded_size > align ? rounded_size : int_size_in_bytes (type);
2859 addr_tree = build (PLUS_EXPR, TREE_TYPE (addr_tree), addr_tree,
2860 build_int_2 (rounded_size - adj, 0));
2863 addr = expand_expr (addr_tree, NULL_RTX, Pmode, EXPAND_NORMAL);
2864 addr = copy_to_reg (addr);
2866 /* Compute new value for AP. */
2867 t = build (MODIFY_EXPR, TREE_TYPE (valist), valist,
2868 build (PLUS_EXPR, TREE_TYPE (valist), valist,
2869 build_int_2 (rounded_size, 0)));
2870 TREE_SIDE_EFFECTS (t) = 1;
2871 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
2876 /* Expand __builtin_va_arg, which is not really a builtin function, but
2877 a very special sort of operator. */
2880 expand_builtin_va_arg (valist, type)
2884 tree promoted_type, want_va_type, have_va_type;
2886 /* Verify that valist is of the proper type. */
2888 want_va_type = va_list_type_node;
2889 have_va_type = TREE_TYPE (valist);
2890 if (TREE_CODE (want_va_type) == ARRAY_TYPE)
2892 /* If va_list is an array type, the argument may have decayed
2893 to a pointer type, e.g. by being passed to another function.
2894 In that case, unwrap both types so that we can compare the
2895 underlying records. */
2896 if (TREE_CODE (have_va_type) == ARRAY_TYPE
2897 || TREE_CODE (have_va_type) == POINTER_TYPE)
2899 want_va_type = TREE_TYPE (want_va_type);
2900 have_va_type = TREE_TYPE (have_va_type);
2903 if (TYPE_MAIN_VARIANT (want_va_type) != TYPE_MAIN_VARIANT (have_va_type))
2905 error ("first argument to `va_arg' not of type `va_list'");
2909 /* Generate a diagnostic for requesting data of a type that cannot
2910 be passed through `...' due to type promotion at the call site. */
2911 else if ((promoted_type = (*lang_type_promotes_to) (type)) != NULL_TREE)
2913 const char *name = "<anonymous type>", *pname = 0;
2914 static int gave_help;
2916 if (TYPE_NAME (type))
2918 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
2919 name = IDENTIFIER_POINTER (TYPE_NAME (type));
2920 else if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
2921 && DECL_NAME (TYPE_NAME (type)))
2922 name = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type)));
2924 if (TYPE_NAME (promoted_type))
2926 if (TREE_CODE (TYPE_NAME (promoted_type)) == IDENTIFIER_NODE)
2927 pname = IDENTIFIER_POINTER (TYPE_NAME (promoted_type));
2928 else if (TREE_CODE (TYPE_NAME (promoted_type)) == TYPE_DECL
2929 && DECL_NAME (TYPE_NAME (promoted_type)))
2930 pname = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (promoted_type)));
2933 error ("`%s' is promoted to `%s' when passed through `...'", name, pname);
2937 error ("(so you should pass `%s' not `%s' to `va_arg')", pname, name);
2944 /* Make it easier for the backends by protecting the valist argument
2945 from multiple evaluations. */
2946 valist = stabilize_va_list (valist, 0);
2948 #ifdef EXPAND_BUILTIN_VA_ARG
2949 addr = EXPAND_BUILTIN_VA_ARG (valist, type);
2951 addr = std_expand_builtin_va_arg (valist, type);
2955 result = gen_rtx_MEM (TYPE_MODE (type), addr);
2956 set_mem_alias_set (result, get_varargs_alias_set ());
2961 /* Expand ARGLIST, from a call to __builtin_va_end. */
2964 expand_builtin_va_end (arglist)
2967 tree valist = TREE_VALUE (arglist);
2969 #ifdef EXPAND_BUILTIN_VA_END
2970 valist = stabilize_va_list (valist, 0);
2971 EXPAND_BUILTIN_VA_END(arglist);
2973 /* Evaluate for side effects, if needed. I hate macros that don't
2975 if (TREE_SIDE_EFFECTS (valist))
2976 expand_expr (valist, const0_rtx, VOIDmode, EXPAND_NORMAL);
2982 /* Expand ARGLIST, from a call to __builtin_va_copy. We do this as a
2983 builtin rather than just as an assignment in stdarg.h because of the
2984 nastiness of array-type va_list types. */
2987 expand_builtin_va_copy (arglist)
2992 dst = TREE_VALUE (arglist);
2993 src = TREE_VALUE (TREE_CHAIN (arglist));
2995 dst = stabilize_va_list (dst, 1);
2996 src = stabilize_va_list (src, 0);
2998 if (TREE_CODE (va_list_type_node) != ARRAY_TYPE)
3000 t = build (MODIFY_EXPR, va_list_type_node, dst, src);
3001 TREE_SIDE_EFFECTS (t) = 1;
3002 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
3006 rtx dstb, srcb, size;
3008 /* Evaluate to pointers. */
3009 dstb = expand_expr (dst, NULL_RTX, Pmode, EXPAND_NORMAL);
3010 srcb = expand_expr (src, NULL_RTX, Pmode, EXPAND_NORMAL);
3011 size = expand_expr (TYPE_SIZE_UNIT (va_list_type_node), NULL_RTX,
3012 VOIDmode, EXPAND_NORMAL);
3014 /* "Dereference" to BLKmode memories. */
3015 dstb = gen_rtx_MEM (BLKmode, dstb);
3016 set_mem_alias_set (dstb, get_alias_set (TREE_TYPE (TREE_TYPE (dst))));
3017 srcb = gen_rtx_MEM (BLKmode, srcb);
3018 set_mem_alias_set (srcb, get_alias_set (TREE_TYPE (TREE_TYPE (src))));
3021 emit_block_move (dstb, srcb, size, TYPE_ALIGN (va_list_type_node));
3027 /* Expand a call to one of the builtin functions __builtin_frame_address or
3028 __builtin_return_address. */
3031 expand_builtin_frame_address (exp)
3034 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
3035 tree arglist = TREE_OPERAND (exp, 1);
3037 /* The argument must be a nonnegative integer constant.
3038 It counts the number of frames to scan up the stack.
3039 The value is the return address saved in that frame. */
3041 /* Warning about missing arg was already issued. */
3043 else if (! host_integerp (TREE_VALUE (arglist), 1))
3045 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
3046 error ("invalid arg to `__builtin_frame_address'");
3048 error ("invalid arg to `__builtin_return_address'");
3054 = expand_builtin_return_addr (DECL_FUNCTION_CODE (fndecl),
3055 tree_low_cst (TREE_VALUE (arglist), 1),
3056 hard_frame_pointer_rtx);
3058 /* Some ports cannot access arbitrary stack frames. */
3061 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
3062 warning ("unsupported arg to `__builtin_frame_address'");
3064 warning ("unsupported arg to `__builtin_return_address'");
3068 /* For __builtin_frame_address, return what we've got. */
3069 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
3072 if (GET_CODE (tem) != REG
3073 && ! CONSTANT_P (tem))
3074 tem = copy_to_mode_reg (Pmode, tem);
3079 /* Expand a call to the alloca builtin, with arguments ARGLIST. Return 0 if
3080 we failed and the caller should emit a normal call, otherwise try to get
3081 the result in TARGET, if convenient. */
3084 expand_builtin_alloca (arglist, target)
3091 if (!validate_arglist (arglist, INTEGER_TYPE, VOID_TYPE))
3094 /* Compute the argument. */
3095 op0 = expand_expr (TREE_VALUE (arglist), NULL_RTX, VOIDmode, 0);
3097 /* Allocate the desired space. */
3098 result = allocate_dynamic_stack_space (op0, target, BITS_PER_UNIT);
3100 #ifdef POINTERS_EXTEND_UNSIGNED
3101 result = convert_memory_address (ptr_mode, result);
3107 /* Expand a call to the ffs builtin. The arguments are in ARGLIST.
3108 Return 0 if a normal call should be emitted rather than expanding the
3109 function in-line. If convenient, the result should be placed in TARGET.
3110 SUBTARGET may be used as the target for computing one of EXP's operands. */
3113 expand_builtin_ffs (arglist, target, subtarget)
3115 rtx target, subtarget;
3118 if (!validate_arglist (arglist, INTEGER_TYPE, VOID_TYPE))
3121 /* Compute the argument. */
3122 op0 = expand_expr (TREE_VALUE (arglist), subtarget, VOIDmode, 0);
3123 /* Compute ffs, into TARGET if possible.
3124 Set TARGET to wherever the result comes back. */
3125 target = expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist))),
3126 ffs_optab, op0, target, 1);
3132 /* If the string passed to fputs is a constant and is one character
3133 long, we attempt to transform this call into __builtin_fputc(). */
3136 expand_builtin_fputs (arglist, ignore)
3140 tree len, fn, fn_fputc = built_in_decls[BUILT_IN_FPUTC],
3141 fn_fwrite = built_in_decls[BUILT_IN_FWRITE];
3143 /* If the return value is used, or the replacement _DECL isn't
3144 initialized, don't do the transformation. */
3145 if (!ignore || !fn_fputc || !fn_fwrite)
3148 /* Verify the arguments in the original call. */
3149 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE)
3150 || current_function_check_memory_usage)
3153 /* Get the length of the string passed to fputs. If the length
3154 can't be determined, punt. */
3155 if (!(len = c_strlen (TREE_VALUE (arglist)))
3156 || TREE_CODE (len) != INTEGER_CST)
3159 switch (compare_tree_int (len, 1))
3161 case -1: /* length is 0, delete the call entirely . */
3163 /* Evaluate and ignore the argument in case it has
3165 expand_expr (TREE_VALUE (TREE_CHAIN (arglist)), const0_rtx,
3166 VOIDmode, EXPAND_NORMAL);
3169 case 0: /* length is 1, call fputc. */
3171 const char *p = c_getstr (TREE_VALUE (arglist));
3175 /* New argument list transforming fputs(string, stream) to
3176 fputc(string[0], stream). */
3178 build_tree_list (NULL_TREE, TREE_VALUE (TREE_CHAIN (arglist)));
3180 tree_cons (NULL_TREE, build_int_2 (p[0], 0), arglist);
3186 case 1: /* length is greater than 1, call fwrite. */
3188 tree string_arg = TREE_VALUE (arglist);
3190 /* New argument list transforming fputs(string, stream) to
3191 fwrite(string, 1, len, stream). */
3192 arglist = build_tree_list (NULL_TREE, TREE_VALUE (TREE_CHAIN (arglist)));
3193 arglist = tree_cons (NULL_TREE, len, arglist);
3194 arglist = tree_cons (NULL_TREE, size_one_node, arglist);
3195 arglist = tree_cons (NULL_TREE, string_arg, arglist);
3203 return expand_expr (build_function_call_expr (fn, arglist),
3204 (ignore ? const0_rtx : NULL_RTX),
3205 VOIDmode, EXPAND_NORMAL);
3208 /* Expand a call to __builtin_expect. We return our argument and emit a
3209 NOTE_INSN_EXPECTED_VALUE note. This is the expansion of __builtin_expect in
3210 a non-jump context. */
3213 expand_builtin_expect (arglist, target)
3220 if (arglist == NULL_TREE
3221 || TREE_CHAIN (arglist) == NULL_TREE)
3223 exp = TREE_VALUE (arglist);
3224 c = TREE_VALUE (TREE_CHAIN (arglist));
3226 if (TREE_CODE (c) != INTEGER_CST)
3228 error ("second arg to `__builtin_expect' must be a constant");
3229 c = integer_zero_node;
3232 target = expand_expr (exp, target, VOIDmode, EXPAND_NORMAL);
3234 /* Don't bother with expected value notes for integral constants. */
3235 if (GET_CODE (target) != CONST_INT)
3237 /* We do need to force this into a register so that we can be
3238 moderately sure to be able to correctly interpret the branch
3240 target = force_reg (GET_MODE (target), target);
3242 rtx_c = expand_expr (c, NULL_RTX, GET_MODE (target), EXPAND_NORMAL);
3244 note = emit_note (NULL, NOTE_INSN_EXPECTED_VALUE);
3245 NOTE_EXPECTED_VALUE (note) = gen_rtx_EQ (VOIDmode, target, rtx_c);
3251 /* Like expand_builtin_expect, except do this in a jump context. This is
3252 called from do_jump if the conditional is a __builtin_expect. Return either
3253 a SEQUENCE of insns to emit the jump or NULL if we cannot optimize
3254 __builtin_expect. We need to optimize this at jump time so that machines
3255 like the PowerPC don't turn the test into a SCC operation, and then jump
3256 based on the test being 0/1. */
3259 expand_builtin_expect_jump (exp, if_false_label, if_true_label)
3264 tree arglist = TREE_OPERAND (exp, 1);
3265 tree arg0 = TREE_VALUE (arglist);
3266 tree arg1 = TREE_VALUE (TREE_CHAIN (arglist));
3269 /* Only handle __builtin_expect (test, 0) and
3270 __builtin_expect (test, 1). */
3271 if (TREE_CODE (TREE_TYPE (arg1)) == INTEGER_TYPE
3272 && (integer_zerop (arg1) || integer_onep (arg1)))
3277 /* If we fail to locate an appropriate conditional jump, we'll
3278 fall back to normal evaluation. Ensure that the expression
3279 can be re-evaluated. */
3280 switch (unsafe_for_reeval (arg0))
3285 case 1: /* Mildly unsafe. */
3286 arg0 = unsave_expr (arg0);
3289 case 2: /* Wildly unsafe. */
3293 /* Expand the jump insns. */
3295 do_jump (arg0, if_false_label, if_true_label);
3296 ret = gen_sequence ();
3299 /* Now that the __builtin_expect has been validated, go through and add
3300 the expect's to each of the conditional jumps. If we run into an
3301 error, just give up and generate the 'safe' code of doing a SCC
3302 operation and then doing a branch on that. */
3303 for (j = 0; j < XVECLEN (ret, 0); j++)
3305 rtx insn = XVECEXP (ret, 0, j);
3308 if (GET_CODE (insn) == JUMP_INSN && any_condjump_p (insn)
3309 && (pattern = pc_set (insn)) != NULL_RTX)
3311 rtx ifelse = SET_SRC (pattern);
3315 if (GET_CODE (ifelse) != IF_THEN_ELSE)
3318 if (GET_CODE (XEXP (ifelse, 1)) == LABEL_REF)
3321 label = XEXP (XEXP (ifelse, 1), 0);
3323 /* An inverted jump reverses the probabilities. */
3324 else if (GET_CODE (XEXP (ifelse, 2)) == LABEL_REF)
3327 label = XEXP (XEXP (ifelse, 2), 0);
3329 /* We shouldn't have to worry about conditional returns during
3330 the expansion stage, but handle it gracefully anyway. */
3331 else if (GET_CODE (XEXP (ifelse, 1)) == RETURN)
3336 /* An inverted return reverses the probabilities. */
3337 else if (GET_CODE (XEXP (ifelse, 2)) == RETURN)
3345 /* If the test is expected to fail, reverse the
3347 if (integer_zerop (arg1))
3350 /* If we are jumping to the false label, reverse the
3352 if (label == NULL_RTX)
3353 ; /* conditional return */
3354 else if (label == if_false_label)
3356 else if (label != if_true_label)
3360 predict_insn_def (insn, PRED_BUILTIN_EXPECT, taken);
3364 /* If no jumps were modified, fail and do __builtin_expect the normal
3373 /* Expand an expression EXP that calls a built-in function,
3374 with result going to TARGET if that's convenient
3375 (and in mode MODE if that's convenient).
3376 SUBTARGET may be used as the target for computing one of EXP's operands.
3377 IGNORE is nonzero if the value is to be ignored. */
3380 expand_builtin (exp, target, subtarget, mode, ignore)
3384 enum machine_mode mode;
3387 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
3388 tree arglist = TREE_OPERAND (exp, 1);
3389 enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
3391 if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_MD)
3392 return (*targetm.expand_builtin) (exp, target, subtarget, mode, ignore);
3394 /* When not optimizing, generate calls to library functions for a certain
3396 if (! optimize && ! CALLED_AS_BUILT_IN (fndecl)
3397 && (fcode == BUILT_IN_SIN || fcode == BUILT_IN_COS
3398 || fcode == BUILT_IN_FSQRT || fcode == BUILT_IN_SQRTF
3399 || fcode == BUILT_IN_SQRTL || fcode == BUILT_IN_MEMSET
3400 || fcode == BUILT_IN_MEMCPY || fcode == BUILT_IN_MEMCMP
3401 || fcode == BUILT_IN_BCMP || fcode == BUILT_IN_BZERO
3402 || fcode == BUILT_IN_INDEX || fcode == BUILT_IN_RINDEX
3403 || fcode == BUILT_IN_STRCHR || fcode == BUILT_IN_STRRCHR
3404 || fcode == BUILT_IN_STRLEN || fcode == BUILT_IN_STRCPY
3405 || fcode == BUILT_IN_STRNCPY || fcode == BUILT_IN_STRNCMP
3406 || fcode == BUILT_IN_STRSTR || fcode == BUILT_IN_STRPBRK
3407 || fcode == BUILT_IN_STRCAT || fcode == BUILT_IN_STRNCAT
3408 || fcode == BUILT_IN_STRSPN || fcode == BUILT_IN_STRCSPN
3409 || fcode == BUILT_IN_STRCMP || fcode == BUILT_IN_FFS
3410 || fcode == BUILT_IN_PUTCHAR || fcode == BUILT_IN_PUTS
3411 || fcode == BUILT_IN_PRINTF || fcode == BUILT_IN_FPUTC
3412 || fcode == BUILT_IN_FPUTS || fcode == BUILT_IN_FWRITE))
3413 return expand_call (exp, target, ignore);
3419 case BUILT_IN_LLABS:
3420 case BUILT_IN_IMAXABS:
3422 case BUILT_IN_FABSF:
3423 case BUILT_IN_FABSL:
3424 /* build_function_call changes these into ABS_EXPR. */
3428 case BUILT_IN_CONJF:
3429 case BUILT_IN_CONJL:
3430 case BUILT_IN_CREAL:
3431 case BUILT_IN_CREALF:
3432 case BUILT_IN_CREALL:
3433 case BUILT_IN_CIMAG:
3434 case BUILT_IN_CIMAGF:
3435 case BUILT_IN_CIMAGL:
3436 /* expand_tree_builtin changes these into CONJ_EXPR, REALPART_EXPR
3437 and IMAGPART_EXPR. */
3446 /* Treat these like sqrt only if unsafe math optimizations are allowed,
3447 because of possible accuracy problems. */
3448 if (! flag_unsafe_math_optimizations)
3450 case BUILT_IN_FSQRT:
3451 case BUILT_IN_SQRTF:
3452 case BUILT_IN_SQRTL:
3453 target = expand_builtin_mathfn (exp, target, subtarget);
3461 case BUILT_IN_APPLY_ARGS:
3462 return expand_builtin_apply_args ();
3464 /* __builtin_apply (FUNCTION, ARGUMENTS, ARGSIZE) invokes
3465 FUNCTION with a copy of the parameters described by
3466 ARGUMENTS, and ARGSIZE. It returns a block of memory
3467 allocated on the stack into which is stored all the registers
3468 that might possibly be used for returning the result of a
3469 function. ARGUMENTS is the value returned by
3470 __builtin_apply_args. ARGSIZE is the number of bytes of
3471 arguments that must be copied. ??? How should this value be
3472 computed? We'll also need a safe worst case value for varargs
3474 case BUILT_IN_APPLY:
3475 if (!validate_arglist (arglist, POINTER_TYPE,
3476 POINTER_TYPE, INTEGER_TYPE, VOID_TYPE)
3477 && !validate_arglist (arglist, REFERENCE_TYPE,
3478 POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
3486 for (t = arglist, i = 0; t; t = TREE_CHAIN (t), i++)
3487 ops[i] = expand_expr (TREE_VALUE (t), NULL_RTX, VOIDmode, 0);
3489 return expand_builtin_apply (ops[0], ops[1], ops[2]);
3492 /* __builtin_return (RESULT) causes the function to return the
3493 value described by RESULT. RESULT is address of the block of
3494 memory returned by __builtin_apply. */
3495 case BUILT_IN_RETURN:
3496 if (validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
3497 expand_builtin_return (expand_expr (TREE_VALUE (arglist),
3498 NULL_RTX, VOIDmode, 0));
3501 case BUILT_IN_SAVEREGS:
3502 return expand_builtin_saveregs ();
3504 case BUILT_IN_ARGS_INFO:
3505 return expand_builtin_args_info (exp);
3507 /* Return the address of the first anonymous stack arg. */
3508 case BUILT_IN_NEXT_ARG:
3509 return expand_builtin_next_arg (arglist);
3511 case BUILT_IN_CLASSIFY_TYPE:
3512 return expand_builtin_classify_type (arglist);
3514 case BUILT_IN_CONSTANT_P:
3515 return expand_builtin_constant_p (exp);
3517 case BUILT_IN_FRAME_ADDRESS:
3518 case BUILT_IN_RETURN_ADDRESS:
3519 return expand_builtin_frame_address (exp);
3521 /* Returns the address of the area where the structure is returned.
3523 case BUILT_IN_AGGREGATE_INCOMING_ADDRESS:
3525 || ! AGGREGATE_TYPE_P (TREE_TYPE (TREE_TYPE (current_function_decl)))
3526 || GET_CODE (DECL_RTL (DECL_RESULT (current_function_decl))) != MEM)
3529 return XEXP (DECL_RTL (DECL_RESULT (current_function_decl)), 0);
3531 case BUILT_IN_ALLOCA:
3532 target = expand_builtin_alloca (arglist, target);
3538 target = expand_builtin_ffs (arglist, target, subtarget);
3543 case BUILT_IN_STRLEN:
3544 target = expand_builtin_strlen (exp, target);
3549 case BUILT_IN_STRCPY:
3550 target = expand_builtin_strcpy (exp);
3555 case BUILT_IN_STRNCPY:
3556 target = expand_builtin_strncpy (arglist, target, mode);
3561 case BUILT_IN_STRCAT:
3562 target = expand_builtin_strcat (arglist, target, mode);
3567 case BUILT_IN_STRNCAT:
3568 target = expand_builtin_strncat (arglist, target, mode);
3573 case BUILT_IN_STRSPN:
3574 target = expand_builtin_strspn (arglist, target, mode);
3579 case BUILT_IN_STRCSPN:
3580 target = expand_builtin_strcspn (arglist, target, mode);
3585 case BUILT_IN_STRSTR:
3586 target = expand_builtin_strstr (arglist, target, mode);
3591 case BUILT_IN_STRPBRK:
3592 target = expand_builtin_strpbrk (arglist, target, mode);
3597 case BUILT_IN_INDEX:
3598 case BUILT_IN_STRCHR:
3599 target = expand_builtin_strchr (arglist, target, mode);
3604 case BUILT_IN_RINDEX:
3605 case BUILT_IN_STRRCHR:
3606 target = expand_builtin_strrchr (arglist, target, mode);
3611 case BUILT_IN_MEMCPY:
3612 target = expand_builtin_memcpy (arglist);
3617 case BUILT_IN_MEMSET:
3618 target = expand_builtin_memset (exp);
3623 case BUILT_IN_BZERO:
3624 target = expand_builtin_bzero (exp);
3629 case BUILT_IN_STRCMP:
3630 target = expand_builtin_strcmp (exp, target, mode);
3635 case BUILT_IN_STRNCMP:
3636 target = expand_builtin_strncmp (exp, target, mode);
3641 /* These comparison functions need an instruction that returns an actual
3642 index. An ordinary compare that just sets the condition codes
3644 #ifdef HAVE_cmpstrsi
3646 case BUILT_IN_MEMCMP:
3647 target = expand_builtin_memcmp (exp, arglist, target);
3653 case BUILT_IN_MEMCMP:
3657 case BUILT_IN_SETJMP:
3658 target = expand_builtin_setjmp (arglist, target);
3663 /* __builtin_longjmp is passed a pointer to an array of five words.
3664 It's similar to the C library longjmp function but works with
3665 __builtin_setjmp above. */
3666 case BUILT_IN_LONGJMP:
3667 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
3671 rtx buf_addr = expand_expr (TREE_VALUE (arglist), subtarget,
3673 rtx value = expand_expr (TREE_VALUE (TREE_CHAIN (arglist)),
3674 NULL_RTX, VOIDmode, 0);
3676 if (value != const1_rtx)
3678 error ("__builtin_longjmp second argument must be 1");
3682 expand_builtin_longjmp (buf_addr, value);
3689 emit_insn (gen_trap ());
3692 error ("__builtin_trap not supported by this target");
3696 case BUILT_IN_PUTCHAR:
3698 case BUILT_IN_FPUTC:
3699 case BUILT_IN_FWRITE:
3701 case BUILT_IN_FPUTS:
3702 target = expand_builtin_fputs (arglist, ignore);
3707 /* Various hooks for the DWARF 2 __throw routine. */
3708 case BUILT_IN_UNWIND_INIT:
3709 expand_builtin_unwind_init ();
3711 case BUILT_IN_DWARF_CFA:
3712 return virtual_cfa_rtx;
3713 #ifdef DWARF2_UNWIND_INFO
3714 case BUILT_IN_DWARF_FP_REGNUM:
3715 return expand_builtin_dwarf_fp_regnum ();
3716 case BUILT_IN_INIT_DWARF_REG_SIZES:
3717 expand_builtin_init_dwarf_reg_sizes (TREE_VALUE (arglist));
3720 case BUILT_IN_FROB_RETURN_ADDR:
3721 return expand_builtin_frob_return_addr (TREE_VALUE (arglist));
3722 case BUILT_IN_EXTRACT_RETURN_ADDR:
3723 return expand_builtin_extract_return_addr (TREE_VALUE (arglist));
3724 case BUILT_IN_EH_RETURN:
3725 expand_builtin_eh_return (TREE_VALUE (arglist),
3726 TREE_VALUE (TREE_CHAIN (arglist)));
3728 #ifdef EH_RETURN_DATA_REGNO
3729 case BUILT_IN_EH_RETURN_DATA_REGNO:
3730 return expand_builtin_eh_return_data_regno (arglist);
3732 case BUILT_IN_VARARGS_START:
3733 return expand_builtin_va_start (0, arglist);
3734 case BUILT_IN_STDARG_START:
3735 return expand_builtin_va_start (1, arglist);
3736 case BUILT_IN_VA_END:
3737 return expand_builtin_va_end (arglist);
3738 case BUILT_IN_VA_COPY:
3739 return expand_builtin_va_copy (arglist);
3740 case BUILT_IN_EXPECT:
3741 return expand_builtin_expect (arglist, target);
3743 default: /* just do library call, if unknown builtin */
3744 error ("built-in function `%s' not currently supported",
3745 IDENTIFIER_POINTER (DECL_NAME (fndecl)));
3748 /* The switch statement above can drop through to cause the function
3749 to be called normally. */
3750 return expand_call (exp, target, ignore);
3753 /* Fold a call to __builtin_constant_p, if we know it will evaluate to a
3754 constant. ARGLIST is the argument list of the call. */
3757 fold_builtin_constant_p (arglist)
3763 arglist = TREE_VALUE (arglist);
3765 /* We return 1 for a numeric type that's known to be a constant
3766 value at compile-time or for an aggregate type that's a
3767 literal constant. */
3768 STRIP_NOPS (arglist);
3770 /* If we know this is a constant, emit the constant of one. */
3771 if (TREE_CODE_CLASS (TREE_CODE (arglist)) == 'c'
3772 || (TREE_CODE (arglist) == CONSTRUCTOR
3773 && TREE_CONSTANT (arglist))
3774 || (TREE_CODE (arglist) == ADDR_EXPR
3775 && TREE_CODE (TREE_OPERAND (arglist, 0)) == STRING_CST))
3776 return integer_one_node;
3778 /* If we aren't going to be running CSE or this expression
3779 has side effects, show we don't know it to be a constant.
3780 Likewise if it's a pointer or aggregate type since in those
3781 case we only want literals, since those are only optimized
3782 when generating RTL, not later.
3783 And finally, if we are compiling an initializer, not code, we
3784 need to return a definite result now; there's not going to be any
3785 more optimization done. */
3786 if (TREE_SIDE_EFFECTS (arglist) || cse_not_expected
3787 || AGGREGATE_TYPE_P (TREE_TYPE (arglist))
3788 || POINTER_TYPE_P (TREE_TYPE (arglist))
3790 return integer_zero_node;
3795 /* Fold a call to __builtin_classify_type. */
3798 fold_builtin_classify_type (arglist)
3802 return build_int_2 (no_type_class, 0);
3804 return build_int_2 (type_to_class (TREE_TYPE (TREE_VALUE (arglist))), 0);
3807 /* Used by constant folding to eliminate some builtin calls early. EXP is
3808 the CALL_EXPR of a call to a builtin function. */
3814 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
3815 tree arglist = TREE_OPERAND (exp, 1);
3816 enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
3818 if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_MD)
3823 case BUILT_IN_CONSTANT_P:
3824 return fold_builtin_constant_p (arglist);
3826 case BUILT_IN_CLASSIFY_TYPE:
3827 return fold_builtin_classify_type (arglist);
3829 case BUILT_IN_STRLEN:
3830 if (validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
3832 tree len = c_strlen (TREE_VALUE (arglist));
3846 build_function_call_expr (fn, arglist)
3851 call_expr = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (fn)), fn);
3852 call_expr = build (CALL_EXPR, TREE_TYPE (TREE_TYPE (fn)),
3853 call_expr, arglist);
3854 TREE_SIDE_EFFECTS (call_expr) = 1;
3855 return fold (call_expr);
3858 /* This function validates the types of a function call argument list
3859 represented as a tree chain of parameters against a specified list
3860 of tree_codes. If the last specifier is a 0, that represents an
3861 ellipses, otherwise the last specifier must be a VOID_TYPE. */
3864 validate_arglist VPARAMS ((tree arglist, ...))
3866 enum tree_code code;
3869 VA_OPEN (ap, arglist);
3870 VA_FIXEDARG (ap, tree, arglist);
3873 code = va_arg (ap, enum tree_code);
3877 /* This signifies an ellipses, any further arguments are all ok. */
3881 /* This signifies an endlink, if no arguments remain, return
3882 true, otherwise return false. */
3886 /* If no parameters remain or the parameter's code does not
3887 match the specified code, return false. Otherwise continue
3888 checking any remaining arguments. */
3889 if (arglist == 0 || code != TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))))
3893 arglist = TREE_CHAIN (arglist);
3896 /* We need gotos here since we can only have one VA_CLOSE in a
3904 /* Default version of target-specific builtin setup that does nothing. */
3907 default_init_builtins ()
3911 /* Default target-specific builtin expander that does nothing. */
3914 default_expand_builtin (exp, target, subtarget, mode, ignore)
3915 tree exp ATTRIBUTE_UNUSED;
3916 rtx target ATTRIBUTE_UNUSED;
3917 rtx subtarget ATTRIBUTE_UNUSED;
3918 enum machine_mode mode ATTRIBUTE_UNUSED;
3919 int ignore ATTRIBUTE_UNUSED;