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 || ! host_integerp (offset_node, 0))
271 offset = tree_low_cst (offset_node, 0);
273 /* If the offset is known to be out of bounds, warn, and call strlen at
275 if (offset < 0 || offset > max)
277 warning ("offset outside bounds of constant string");
281 /* Use strlen to search for the first zero byte. Since any strings
282 constructed with build_string will have nulls appended, we win even
283 if we get handed something like (char[4])"abcd".
285 Since OFFSET is our starting index into the string, no further
286 calculation is needed. */
287 return ssize_int (strlen (ptr + offset));
290 /* Return a char pointer for a C string if it is a string constant
291 or sum of string constant and integer constant. */
298 HOST_WIDE_INT offset;
300 src = string_constant (src, &offset_node);
304 if (offset_node == 0)
305 return TREE_STRING_POINTER (src);
306 else if (!host_integerp (offset_node, 1)
307 || compare_tree_int (offset_node, TREE_STRING_LENGTH (src) - 1) > 0)
310 return TREE_STRING_POINTER (src) + tree_low_cst (offset_node, 1);
313 /* Return a CONST_INT or CONST_DOUBLE corresponding to target reading
314 GET_MODE_BITSIZE (MODE) bits from string constant STR. */
317 c_readstr (str, mode)
319 enum machine_mode mode;
325 if (GET_MODE_CLASS (mode) != MODE_INT)
330 for (i = 0; i < GET_MODE_SIZE (mode); i++)
333 if (WORDS_BIG_ENDIAN)
334 j = GET_MODE_SIZE (mode) - i - 1;
335 if (BYTES_BIG_ENDIAN != WORDS_BIG_ENDIAN
336 && GET_MODE_SIZE (mode) > UNITS_PER_WORD)
337 j = j + UNITS_PER_WORD - 2 * (j % UNITS_PER_WORD) - 1;
339 if (j > 2 * HOST_BITS_PER_WIDE_INT)
342 ch = (unsigned char) str[i];
343 c[j / HOST_BITS_PER_WIDE_INT] |= ch << (j % HOST_BITS_PER_WIDE_INT);
345 return immed_double_const (c[0], c[1], mode);
348 /* Cast a target constant CST to target CHAR and if that value fits into
349 host char type, return zero and put that value into variable pointed by
353 target_char_cast (cst, p)
357 unsigned HOST_WIDE_INT val, hostval;
359 if (!host_integerp (cst, 1)
360 || CHAR_TYPE_SIZE > HOST_BITS_PER_WIDE_INT)
363 val = tree_low_cst (cst, 1);
364 if (CHAR_TYPE_SIZE < HOST_BITS_PER_WIDE_INT)
365 val &= (((unsigned HOST_WIDE_INT) 1) << CHAR_TYPE_SIZE) - 1;
368 if (HOST_BITS_PER_CHAR < HOST_BITS_PER_WIDE_INT)
369 hostval &= (((unsigned HOST_WIDE_INT) 1) << HOST_BITS_PER_CHAR) - 1;
378 /* Given TEM, a pointer to a stack frame, follow the dynamic chain COUNT
379 times to get the address of either a higher stack frame, or a return
380 address located within it (depending on FNDECL_CODE). */
383 expand_builtin_return_addr (fndecl_code, count, tem)
384 enum built_in_function fndecl_code;
390 /* Some machines need special handling before we can access
391 arbitrary frames. For example, on the sparc, we must first flush
392 all register windows to the stack. */
393 #ifdef SETUP_FRAME_ADDRESSES
395 SETUP_FRAME_ADDRESSES ();
398 /* On the sparc, the return address is not in the frame, it is in a
399 register. There is no way to access it off of the current frame
400 pointer, but it can be accessed off the previous frame pointer by
401 reading the value from the register window save area. */
402 #ifdef RETURN_ADDR_IN_PREVIOUS_FRAME
403 if (fndecl_code == BUILT_IN_RETURN_ADDRESS)
407 /* Scan back COUNT frames to the specified frame. */
408 for (i = 0; i < count; i++)
410 /* Assume the dynamic chain pointer is in the word that the
411 frame address points to, unless otherwise specified. */
412 #ifdef DYNAMIC_CHAIN_ADDRESS
413 tem = DYNAMIC_CHAIN_ADDRESS (tem);
415 tem = memory_address (Pmode, tem);
416 tem = gen_rtx_MEM (Pmode, tem);
417 set_mem_alias_set (tem, get_frame_alias_set ());
418 tem = copy_to_reg (tem);
421 /* For __builtin_frame_address, return what we've got. */
422 if (fndecl_code == BUILT_IN_FRAME_ADDRESS)
425 /* For __builtin_return_address, Get the return address from that
427 #ifdef RETURN_ADDR_RTX
428 tem = RETURN_ADDR_RTX (count, tem);
430 tem = memory_address (Pmode,
431 plus_constant (tem, GET_MODE_SIZE (Pmode)));
432 tem = gen_rtx_MEM (Pmode, tem);
433 set_mem_alias_set (tem, get_frame_alias_set ());
438 /* Alias set used for setjmp buffer. */
439 static HOST_WIDE_INT setjmp_alias_set = -1;
441 /* Construct the leading half of a __builtin_setjmp call. Control will
442 return to RECEIVER_LABEL. This is used directly by sjlj exception
446 expand_builtin_setjmp_setup (buf_addr, receiver_label)
450 enum machine_mode sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL);
454 if (setjmp_alias_set == -1)
455 setjmp_alias_set = new_alias_set ();
457 #ifdef POINTERS_EXTEND_UNSIGNED
458 buf_addr = convert_memory_address (Pmode, buf_addr);
461 buf_addr = force_reg (Pmode, force_operand (buf_addr, NULL_RTX));
465 /* We store the frame pointer and the address of receiver_label in
466 the buffer and use the rest of it for the stack save area, which
467 is machine-dependent. */
469 #ifndef BUILTIN_SETJMP_FRAME_VALUE
470 #define BUILTIN_SETJMP_FRAME_VALUE virtual_stack_vars_rtx
473 mem = gen_rtx_MEM (Pmode, buf_addr);
474 set_mem_alias_set (mem, setjmp_alias_set);
475 emit_move_insn (mem, BUILTIN_SETJMP_FRAME_VALUE);
477 mem = gen_rtx_MEM (Pmode, plus_constant (buf_addr, GET_MODE_SIZE (Pmode))),
478 set_mem_alias_set (mem, setjmp_alias_set);
480 emit_move_insn (validize_mem (mem),
481 force_reg (Pmode, gen_rtx_LABEL_REF (Pmode, receiver_label)));
483 stack_save = gen_rtx_MEM (sa_mode,
484 plus_constant (buf_addr,
485 2 * GET_MODE_SIZE (Pmode)));
486 set_mem_alias_set (stack_save, setjmp_alias_set);
487 emit_stack_save (SAVE_NONLOCAL, &stack_save, NULL_RTX);
489 /* If there is further processing to do, do it. */
490 #ifdef HAVE_builtin_setjmp_setup
491 if (HAVE_builtin_setjmp_setup)
492 emit_insn (gen_builtin_setjmp_setup (buf_addr));
495 /* Tell optimize_save_area_alloca that extra work is going to
496 need to go on during alloca. */
497 current_function_calls_setjmp = 1;
499 /* Set this so all the registers get saved in our frame; we need to be
500 able to copy the saved values for any registers from frames we unwind. */
501 current_function_has_nonlocal_label = 1;
504 /* Construct the trailing part of a __builtin_setjmp call.
505 This is used directly by sjlj exception handling code. */
508 expand_builtin_setjmp_receiver (receiver_label)
509 rtx receiver_label ATTRIBUTE_UNUSED;
511 /* Clobber the FP when we get here, so we have to make sure it's
512 marked as used by this function. */
513 emit_insn (gen_rtx_USE (VOIDmode, hard_frame_pointer_rtx));
515 /* Mark the static chain as clobbered here so life information
516 doesn't get messed up for it. */
517 emit_insn (gen_rtx_CLOBBER (VOIDmode, static_chain_rtx));
519 /* Now put in the code to restore the frame pointer, and argument
520 pointer, if needed. The code below is from expand_end_bindings
521 in stmt.c; see detailed documentation there. */
522 #ifdef HAVE_nonlocal_goto
523 if (! HAVE_nonlocal_goto)
525 emit_move_insn (virtual_stack_vars_rtx, hard_frame_pointer_rtx);
527 #if ARG_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM
528 if (fixed_regs[ARG_POINTER_REGNUM])
530 #ifdef ELIMINABLE_REGS
532 static struct elims {int from, to;} elim_regs[] = ELIMINABLE_REGS;
534 for (i = 0; i < ARRAY_SIZE (elim_regs); i++)
535 if (elim_regs[i].from == ARG_POINTER_REGNUM
536 && elim_regs[i].to == HARD_FRAME_POINTER_REGNUM)
539 if (i == ARRAY_SIZE (elim_regs))
542 /* Now restore our arg pointer from the address at which it
543 was saved in our stack frame. */
544 emit_move_insn (virtual_incoming_args_rtx,
545 copy_to_reg (get_arg_pointer_save_area (cfun)));
550 #ifdef HAVE_builtin_setjmp_receiver
551 if (HAVE_builtin_setjmp_receiver)
552 emit_insn (gen_builtin_setjmp_receiver (receiver_label));
555 #ifdef HAVE_nonlocal_goto_receiver
556 if (HAVE_nonlocal_goto_receiver)
557 emit_insn (gen_nonlocal_goto_receiver ());
562 /* @@@ This is a kludge. Not all machine descriptions define a blockage
563 insn, but we must not allow the code we just generated to be reordered
564 by scheduling. Specifically, the update of the frame pointer must
565 happen immediately, not later. So emit an ASM_INPUT to act as blockage
567 emit_insn (gen_rtx_ASM_INPUT (VOIDmode, ""));
570 /* __builtin_setjmp is passed a pointer to an array of five words (not
571 all will be used on all machines). It operates similarly to the C
572 library function of the same name, but is more efficient. Much of
573 the code below (and for longjmp) is copied from the handling of
576 NOTE: This is intended for use by GNAT and the exception handling
577 scheme in the compiler and will only work in the method used by
581 expand_builtin_setjmp (arglist, target)
585 rtx buf_addr, next_lab, cont_lab;
587 if (!validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
590 if (target == 0 || GET_CODE (target) != REG
591 || REGNO (target) < FIRST_PSEUDO_REGISTER)
592 target = gen_reg_rtx (TYPE_MODE (integer_type_node));
594 buf_addr = expand_expr (TREE_VALUE (arglist), NULL_RTX, VOIDmode, 0);
596 next_lab = gen_label_rtx ();
597 cont_lab = gen_label_rtx ();
599 expand_builtin_setjmp_setup (buf_addr, next_lab);
601 /* Set TARGET to zero and branch to the continue label. */
602 emit_move_insn (target, const0_rtx);
603 emit_jump_insn (gen_jump (cont_lab));
605 emit_label (next_lab);
607 expand_builtin_setjmp_receiver (next_lab);
609 /* Set TARGET to one. */
610 emit_move_insn (target, const1_rtx);
611 emit_label (cont_lab);
613 /* Tell flow about the strange goings on. Putting `next_lab' on
614 `nonlocal_goto_handler_labels' to indicates that function
615 calls may traverse the arc back to this label. */
617 current_function_has_nonlocal_label = 1;
618 nonlocal_goto_handler_labels
619 = gen_rtx_EXPR_LIST (VOIDmode, next_lab, nonlocal_goto_handler_labels);
624 /* __builtin_longjmp is passed a pointer to an array of five words (not
625 all will be used on all machines). It operates similarly to the C
626 library function of the same name, but is more efficient. Much of
627 the code below is copied from the handling of non-local gotos.
629 NOTE: This is intended for use by GNAT and the exception handling
630 scheme in the compiler and will only work in the method used by
634 expand_builtin_longjmp (buf_addr, value)
637 rtx fp, lab, stack, insn;
638 enum machine_mode sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL);
640 if (setjmp_alias_set == -1)
641 setjmp_alias_set = new_alias_set ();
643 #ifdef POINTERS_EXTEND_UNSIGNED
644 buf_addr = convert_memory_address (Pmode, buf_addr);
646 buf_addr = force_reg (Pmode, buf_addr);
648 /* We used to store value in static_chain_rtx, but that fails if pointers
649 are smaller than integers. We instead require that the user must pass
650 a second argument of 1, because that is what builtin_setjmp will
651 return. This also makes EH slightly more efficient, since we are no
652 longer copying around a value that we don't care about. */
653 if (value != const1_rtx)
656 current_function_calls_longjmp = 1;
658 #ifdef HAVE_builtin_longjmp
659 if (HAVE_builtin_longjmp)
660 emit_insn (gen_builtin_longjmp (buf_addr));
664 fp = gen_rtx_MEM (Pmode, buf_addr);
665 lab = gen_rtx_MEM (Pmode, plus_constant (buf_addr,
666 GET_MODE_SIZE (Pmode)));
668 stack = gen_rtx_MEM (sa_mode, plus_constant (buf_addr,
669 2 * GET_MODE_SIZE (Pmode)));
670 set_mem_alias_set (fp, setjmp_alias_set);
671 set_mem_alias_set (lab, setjmp_alias_set);
672 set_mem_alias_set (stack, setjmp_alias_set);
674 /* Pick up FP, label, and SP from the block and jump. This code is
675 from expand_goto in stmt.c; see there for detailed comments. */
676 #if HAVE_nonlocal_goto
677 if (HAVE_nonlocal_goto)
678 /* We have to pass a value to the nonlocal_goto pattern that will
679 get copied into the static_chain pointer, but it does not matter
680 what that value is, because builtin_setjmp does not use it. */
681 emit_insn (gen_nonlocal_goto (value, lab, stack, fp));
685 lab = copy_to_reg (lab);
687 emit_move_insn (hard_frame_pointer_rtx, fp);
688 emit_stack_restore (SAVE_NONLOCAL, stack, NULL_RTX);
690 emit_insn (gen_rtx_USE (VOIDmode, hard_frame_pointer_rtx));
691 emit_insn (gen_rtx_USE (VOIDmode, stack_pointer_rtx));
692 emit_indirect_jump (lab);
696 /* Search backwards and mark the jump insn as a non-local goto.
697 Note that this precludes the use of __builtin_longjmp to a
698 __builtin_setjmp target in the same function. However, we've
699 already cautioned the user that these functions are for
700 internal exception handling use only. */
701 for (insn = get_last_insn (); insn; insn = PREV_INSN (insn))
703 if (GET_CODE (insn) == JUMP_INSN)
705 REG_NOTES (insn) = alloc_EXPR_LIST (REG_NON_LOCAL_GOTO, const0_rtx,
709 else if (GET_CODE (insn) == CALL_INSN)
714 /* Get a MEM rtx for expression EXP which is the address of an operand
715 to be used to be used in a string instruction (cmpstrsi, movstrsi, ..). */
721 rtx mem = gen_rtx_MEM (BLKmode,
722 memory_address (BLKmode,
723 expand_expr (exp, NULL_RTX,
724 ptr_mode, EXPAND_SUM)));
726 /* Get an expression we can use to find the attributes to assign to MEM.
727 If it is an ADDR_EXPR, use the operand. Otherwise, dereference it if
728 we can. First remove any nops. */
729 while ((TREE_CODE (exp) == NOP_EXPR || TREE_CODE (exp) == CONVERT_EXPR
730 || TREE_CODE (exp) == NON_LVALUE_EXPR)
731 && POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (exp, 0))))
732 exp = TREE_OPERAND (exp, 0);
734 if (TREE_CODE (exp) == ADDR_EXPR)
735 exp = TREE_OPERAND (exp, 0);
736 else if (POINTER_TYPE_P (TREE_TYPE (exp)))
737 exp = build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (exp)), exp);
741 set_mem_attributes (mem, exp, 0);
742 /* memcpy, memset and other builtin stringops can alias with anything. */
743 set_mem_alias_set (mem, 0);
747 /* Built-in functions to perform an untyped call and return. */
749 /* For each register that may be used for calling a function, this
750 gives a mode used to copy the register's value. VOIDmode indicates
751 the register is not used for calling a function. If the machine
752 has register windows, this gives only the outbound registers.
753 INCOMING_REGNO gives the corresponding inbound register. */
754 static enum machine_mode apply_args_mode[FIRST_PSEUDO_REGISTER];
756 /* For each register that may be used for returning values, this gives
757 a mode used to copy the register's value. VOIDmode indicates the
758 register is not used for returning values. If the machine has
759 register windows, this gives only the outbound registers.
760 INCOMING_REGNO gives the corresponding inbound register. */
761 static enum machine_mode apply_result_mode[FIRST_PSEUDO_REGISTER];
763 /* For each register that may be used for calling a function, this
764 gives the offset of that register into the block returned by
765 __builtin_apply_args. 0 indicates that the register is not
766 used for calling a function. */
767 static int apply_args_reg_offset[FIRST_PSEUDO_REGISTER];
769 /* Return the offset of register REGNO into the block returned by
770 __builtin_apply_args. This is not declared static, since it is
771 needed in objc-act.c. */
774 apply_args_register_offset (regno)
779 /* Arguments are always put in outgoing registers (in the argument
780 block) if such make sense. */
781 #ifdef OUTGOING_REGNO
782 regno = OUTGOING_REGNO(regno);
784 return apply_args_reg_offset[regno];
787 /* Return the size required for the block returned by __builtin_apply_args,
788 and initialize apply_args_mode. */
793 static int size = -1;
795 enum machine_mode mode;
797 /* The values computed by this function never change. */
800 /* The first value is the incoming arg-pointer. */
801 size = GET_MODE_SIZE (Pmode);
803 /* The second value is the structure value address unless this is
804 passed as an "invisible" first argument. */
805 if (struct_value_rtx)
806 size += GET_MODE_SIZE (Pmode);
808 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
809 if (FUNCTION_ARG_REGNO_P (regno))
811 /* Search for the proper mode for copying this register's
812 value. I'm not sure this is right, but it works so far. */
813 enum machine_mode best_mode = VOIDmode;
815 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
817 mode = GET_MODE_WIDER_MODE (mode))
818 if (HARD_REGNO_MODE_OK (regno, mode)
819 && HARD_REGNO_NREGS (regno, mode) == 1)
822 if (best_mode == VOIDmode)
823 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
825 mode = GET_MODE_WIDER_MODE (mode))
826 if (HARD_REGNO_MODE_OK (regno, mode)
827 && have_insn_for (SET, mode))
831 if (mode == VOIDmode)
834 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
835 if (size % align != 0)
836 size = CEIL (size, align) * align;
837 apply_args_reg_offset[regno] = size;
838 size += GET_MODE_SIZE (mode);
839 apply_args_mode[regno] = mode;
843 apply_args_mode[regno] = VOIDmode;
844 apply_args_reg_offset[regno] = 0;
850 /* Return the size required for the block returned by __builtin_apply,
851 and initialize apply_result_mode. */
856 static int size = -1;
858 enum machine_mode mode;
860 /* The values computed by this function never change. */
865 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
866 if (FUNCTION_VALUE_REGNO_P (regno))
868 /* Search for the proper mode for copying this register's
869 value. I'm not sure this is right, but it works so far. */
870 enum machine_mode best_mode = VOIDmode;
872 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
874 mode = GET_MODE_WIDER_MODE (mode))
875 if (HARD_REGNO_MODE_OK (regno, mode))
878 if (best_mode == VOIDmode)
879 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
881 mode = GET_MODE_WIDER_MODE (mode))
882 if (HARD_REGNO_MODE_OK (regno, mode)
883 && have_insn_for (SET, mode))
887 if (mode == VOIDmode)
890 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
891 if (size % align != 0)
892 size = CEIL (size, align) * align;
893 size += GET_MODE_SIZE (mode);
894 apply_result_mode[regno] = mode;
897 apply_result_mode[regno] = VOIDmode;
899 /* Allow targets that use untyped_call and untyped_return to override
900 the size so that machine-specific information can be stored here. */
901 #ifdef APPLY_RESULT_SIZE
902 size = APPLY_RESULT_SIZE;
908 #if defined (HAVE_untyped_call) || defined (HAVE_untyped_return)
909 /* Create a vector describing the result block RESULT. If SAVEP is true,
910 the result block is used to save the values; otherwise it is used to
911 restore the values. */
914 result_vector (savep, result)
918 int regno, size, align, nelts;
919 enum machine_mode mode;
921 rtx *savevec = (rtx *) alloca (FIRST_PSEUDO_REGISTER * sizeof (rtx));
924 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
925 if ((mode = apply_result_mode[regno]) != VOIDmode)
927 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
928 if (size % align != 0)
929 size = CEIL (size, align) * align;
930 reg = gen_rtx_REG (mode, savep ? regno : INCOMING_REGNO (regno));
931 mem = adjust_address (result, mode, size);
932 savevec[nelts++] = (savep
933 ? gen_rtx_SET (VOIDmode, mem, reg)
934 : gen_rtx_SET (VOIDmode, reg, mem));
935 size += GET_MODE_SIZE (mode);
937 return gen_rtx_PARALLEL (VOIDmode, gen_rtvec_v (nelts, savevec));
939 #endif /* HAVE_untyped_call or HAVE_untyped_return */
941 /* Save the state required to perform an untyped call with the same
942 arguments as were passed to the current function. */
945 expand_builtin_apply_args_1 ()
948 int size, align, regno;
949 enum machine_mode mode;
951 /* Create a block where the arg-pointer, structure value address,
952 and argument registers can be saved. */
953 registers = assign_stack_local (BLKmode, apply_args_size (), -1);
955 /* Walk past the arg-pointer and structure value address. */
956 size = GET_MODE_SIZE (Pmode);
957 if (struct_value_rtx)
958 size += GET_MODE_SIZE (Pmode);
960 /* Save each register used in calling a function to the block. */
961 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
962 if ((mode = apply_args_mode[regno]) != VOIDmode)
966 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
967 if (size % align != 0)
968 size = CEIL (size, align) * align;
970 tem = gen_rtx_REG (mode, INCOMING_REGNO (regno));
972 emit_move_insn (adjust_address (registers, mode, size), tem);
973 size += GET_MODE_SIZE (mode);
976 /* Save the arg pointer to the block. */
977 emit_move_insn (adjust_address (registers, Pmode, 0),
978 copy_to_reg (virtual_incoming_args_rtx));
979 size = GET_MODE_SIZE (Pmode);
981 /* Save the structure value address unless this is passed as an
982 "invisible" first argument. */
983 if (struct_value_incoming_rtx)
985 emit_move_insn (adjust_address (registers, Pmode, size),
986 copy_to_reg (struct_value_incoming_rtx));
987 size += GET_MODE_SIZE (Pmode);
990 /* Return the address of the block. */
991 return copy_addr_to_reg (XEXP (registers, 0));
994 /* __builtin_apply_args returns block of memory allocated on
995 the stack into which is stored the arg pointer, structure
996 value address, static chain, and all the registers that might
997 possibly be used in performing a function call. The code is
998 moved to the start of the function so the incoming values are
1002 expand_builtin_apply_args ()
1004 /* Don't do __builtin_apply_args more than once in a function.
1005 Save the result of the first call and reuse it. */
1006 if (apply_args_value != 0)
1007 return apply_args_value;
1009 /* When this function is called, it means that registers must be
1010 saved on entry to this function. So we migrate the
1011 call to the first insn of this function. */
1016 temp = expand_builtin_apply_args_1 ();
1020 apply_args_value = temp;
1022 /* Put the sequence after the NOTE that starts the function.
1023 If this is inside a SEQUENCE, make the outer-level insn
1024 chain current, so the code is placed at the start of the
1026 push_topmost_sequence ();
1027 emit_insns_before (seq, NEXT_INSN (get_insns ()));
1028 pop_topmost_sequence ();
1033 /* Perform an untyped call and save the state required to perform an
1034 untyped return of whatever value was returned by the given function. */
1037 expand_builtin_apply (function, arguments, argsize)
1038 rtx function, arguments, argsize;
1040 int size, align, regno;
1041 enum machine_mode mode;
1042 rtx incoming_args, result, reg, dest, call_insn;
1043 rtx old_stack_level = 0;
1044 rtx call_fusage = 0;
1046 /* Create a block where the return registers can be saved. */
1047 result = assign_stack_local (BLKmode, apply_result_size (), -1);
1049 /* Fetch the arg pointer from the ARGUMENTS block. */
1050 incoming_args = gen_reg_rtx (Pmode);
1051 emit_move_insn (incoming_args,
1052 gen_rtx_MEM (Pmode, arguments));
1053 #ifndef STACK_GROWS_DOWNWARD
1054 incoming_args = expand_simple_binop (Pmode, MINUS, incoming_args, argsize,
1055 incoming_args, 0, OPTAB_LIB_WIDEN);
1058 /* Perform postincrements before actually calling the function. */
1061 /* Push a new argument block and copy the arguments. Do not allow
1062 the (potential) memcpy call below to interfere with our stack
1064 do_pending_stack_adjust ();
1067 /* Save the stack with nonlocal if available */
1068 #ifdef HAVE_save_stack_nonlocal
1069 if (HAVE_save_stack_nonlocal)
1070 emit_stack_save (SAVE_NONLOCAL, &old_stack_level, NULL_RTX);
1073 emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX);
1075 /* Push a block of memory onto the stack to store the memory arguments.
1076 Save the address in a register, and copy the memory arguments. ??? I
1077 haven't figured out how the calling convention macros effect this,
1078 but it's likely that the source and/or destination addresses in
1079 the block copy will need updating in machine specific ways. */
1080 dest = allocate_dynamic_stack_space (argsize, 0, BITS_PER_UNIT);
1081 emit_block_move (gen_rtx_MEM (BLKmode, dest),
1082 gen_rtx_MEM (BLKmode, incoming_args),
1083 argsize, PARM_BOUNDARY);
1085 /* Refer to the argument block. */
1087 arguments = gen_rtx_MEM (BLKmode, arguments);
1089 /* Walk past the arg-pointer and structure value address. */
1090 size = GET_MODE_SIZE (Pmode);
1091 if (struct_value_rtx)
1092 size += GET_MODE_SIZE (Pmode);
1094 /* Restore each of the registers previously saved. Make USE insns
1095 for each of these registers for use in making the call. */
1096 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1097 if ((mode = apply_args_mode[regno]) != VOIDmode)
1099 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
1100 if (size % align != 0)
1101 size = CEIL (size, align) * align;
1102 reg = gen_rtx_REG (mode, regno);
1103 emit_move_insn (reg, adjust_address (arguments, mode, size));
1104 use_reg (&call_fusage, reg);
1105 size += GET_MODE_SIZE (mode);
1108 /* Restore the structure value address unless this is passed as an
1109 "invisible" first argument. */
1110 size = GET_MODE_SIZE (Pmode);
1111 if (struct_value_rtx)
1113 rtx value = gen_reg_rtx (Pmode);
1114 emit_move_insn (value, adjust_address (arguments, Pmode, size));
1115 emit_move_insn (struct_value_rtx, value);
1116 if (GET_CODE (struct_value_rtx) == REG)
1117 use_reg (&call_fusage, struct_value_rtx);
1118 size += GET_MODE_SIZE (Pmode);
1121 /* All arguments and registers used for the call are set up by now! */
1122 function = prepare_call_address (function, NULL_TREE, &call_fusage, 0, 0);
1124 /* Ensure address is valid. SYMBOL_REF is already valid, so no need,
1125 and we don't want to load it into a register as an optimization,
1126 because prepare_call_address already did it if it should be done. */
1127 if (GET_CODE (function) != SYMBOL_REF)
1128 function = memory_address (FUNCTION_MODE, function);
1130 /* Generate the actual call instruction and save the return value. */
1131 #ifdef HAVE_untyped_call
1132 if (HAVE_untyped_call)
1133 emit_call_insn (gen_untyped_call (gen_rtx_MEM (FUNCTION_MODE, function),
1134 result, result_vector (1, result)));
1137 #ifdef HAVE_call_value
1138 if (HAVE_call_value)
1142 /* Locate the unique return register. It is not possible to
1143 express a call that sets more than one return register using
1144 call_value; use untyped_call for that. In fact, untyped_call
1145 only needs to save the return registers in the given block. */
1146 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1147 if ((mode = apply_result_mode[regno]) != VOIDmode)
1150 abort (); /* HAVE_untyped_call required. */
1151 valreg = gen_rtx_REG (mode, regno);
1154 emit_call_insn (GEN_CALL_VALUE (valreg,
1155 gen_rtx_MEM (FUNCTION_MODE, function),
1156 const0_rtx, NULL_RTX, const0_rtx));
1158 emit_move_insn (adjust_address (result, GET_MODE (valreg), 0), valreg);
1164 /* Find the CALL insn we just emitted. */
1165 for (call_insn = get_last_insn ();
1166 call_insn && GET_CODE (call_insn) != CALL_INSN;
1167 call_insn = PREV_INSN (call_insn))
1173 /* Put the register usage information on the CALL. If there is already
1174 some usage information, put ours at the end. */
1175 if (CALL_INSN_FUNCTION_USAGE (call_insn))
1179 for (link = CALL_INSN_FUNCTION_USAGE (call_insn); XEXP (link, 1) != 0;
1180 link = XEXP (link, 1))
1183 XEXP (link, 1) = call_fusage;
1186 CALL_INSN_FUNCTION_USAGE (call_insn) = call_fusage;
1188 /* Restore the stack. */
1189 #ifdef HAVE_save_stack_nonlocal
1190 if (HAVE_save_stack_nonlocal)
1191 emit_stack_restore (SAVE_NONLOCAL, old_stack_level, NULL_RTX);
1194 emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX);
1198 /* Return the address of the result block. */
1199 return copy_addr_to_reg (XEXP (result, 0));
1202 /* Perform an untyped return. */
1205 expand_builtin_return (result)
1208 int size, align, regno;
1209 enum machine_mode mode;
1211 rtx call_fusage = 0;
1213 apply_result_size ();
1214 result = gen_rtx_MEM (BLKmode, result);
1216 #ifdef HAVE_untyped_return
1217 if (HAVE_untyped_return)
1219 emit_jump_insn (gen_untyped_return (result, result_vector (0, result)));
1225 /* Restore the return value and note that each value is used. */
1227 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1228 if ((mode = apply_result_mode[regno]) != VOIDmode)
1230 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
1231 if (size % align != 0)
1232 size = CEIL (size, align) * align;
1233 reg = gen_rtx_REG (mode, INCOMING_REGNO (regno));
1234 emit_move_insn (reg, adjust_address (result, mode, size));
1236 push_to_sequence (call_fusage);
1237 emit_insn (gen_rtx_USE (VOIDmode, reg));
1238 call_fusage = get_insns ();
1240 size += GET_MODE_SIZE (mode);
1243 /* Put the USE insns before the return. */
1244 emit_insns (call_fusage);
1246 /* Return whatever values was restored by jumping directly to the end
1248 expand_null_return ();
1251 /* Used by expand_builtin_classify_type and fold_builtin_classify_type. */
1253 static enum type_class
1254 type_to_class (type)
1257 switch (TREE_CODE (type))
1259 case VOID_TYPE: return void_type_class;
1260 case INTEGER_TYPE: return integer_type_class;
1261 case CHAR_TYPE: return char_type_class;
1262 case ENUMERAL_TYPE: return enumeral_type_class;
1263 case BOOLEAN_TYPE: return boolean_type_class;
1264 case POINTER_TYPE: return pointer_type_class;
1265 case REFERENCE_TYPE: return reference_type_class;
1266 case OFFSET_TYPE: return offset_type_class;
1267 case REAL_TYPE: return real_type_class;
1268 case COMPLEX_TYPE: return complex_type_class;
1269 case FUNCTION_TYPE: return function_type_class;
1270 case METHOD_TYPE: return method_type_class;
1271 case RECORD_TYPE: return record_type_class;
1273 case QUAL_UNION_TYPE: return union_type_class;
1274 case ARRAY_TYPE: return (TYPE_STRING_FLAG (type)
1275 ? string_type_class : array_type_class);
1276 case SET_TYPE: return set_type_class;
1277 case FILE_TYPE: return file_type_class;
1278 case LANG_TYPE: return lang_type_class;
1279 default: return no_type_class;
1283 /* Expand a call to __builtin_classify_type with arguments found in
1287 expand_builtin_classify_type (arglist)
1291 return GEN_INT (type_to_class (TREE_TYPE (TREE_VALUE (arglist))));
1292 return GEN_INT (no_type_class);
1295 /* Expand expression EXP, which is a call to __builtin_constant_p. */
1298 expand_builtin_constant_p (exp)
1301 tree arglist = TREE_OPERAND (exp, 1);
1302 enum machine_mode value_mode = TYPE_MODE (TREE_TYPE (exp));
1307 arglist = TREE_VALUE (arglist);
1309 /* We have taken care of the easy cases during constant folding. This
1310 case is not obvious, so emit (constant_p_rtx (ARGLIST)) and let CSE get a
1311 chance to see if it can deduce whether ARGLIST is constant. */
1313 tmp = expand_expr (arglist, NULL_RTX, VOIDmode, 0);
1314 tmp = gen_rtx_CONSTANT_P_RTX (value_mode, tmp);
1318 /* Expand a call to one of the builtin math functions (sin, cos, or sqrt).
1319 Return 0 if a normal call should be emitted rather than expanding the
1320 function in-line. EXP is the expression that is a call to the builtin
1321 function; if convenient, the result should be placed in TARGET.
1322 SUBTARGET may be used as the target for computing one of EXP's operands. */
1325 expand_builtin_mathfn (exp, target, subtarget)
1327 rtx target, subtarget;
1329 optab builtin_optab;
1331 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
1332 tree arglist = TREE_OPERAND (exp, 1);
1334 if (!validate_arglist (arglist, REAL_TYPE, VOID_TYPE))
1337 /* Stabilize and compute the argument. */
1338 if (TREE_CODE (TREE_VALUE (arglist)) != VAR_DECL
1339 && TREE_CODE (TREE_VALUE (arglist)) != PARM_DECL)
1341 exp = copy_node (exp);
1342 TREE_OPERAND (exp, 1) = arglist;
1343 /* Wrap the computation of the argument in a SAVE_EXPR. That
1344 way, if we need to expand the argument again (as in the
1345 flag_errno_math case below where we cannot directly set
1346 errno), we will not perform side-effects more than once.
1347 Note that here we're mutating the original EXP as well as the
1348 copy; that's the right thing to do in case the original EXP
1349 is expanded later. */
1350 TREE_VALUE (arglist) = save_expr (TREE_VALUE (arglist));
1351 arglist = copy_node (arglist);
1353 op0 = expand_expr (TREE_VALUE (arglist), subtarget, VOIDmode, 0);
1355 /* Make a suitable register to place result in. */
1356 target = gen_reg_rtx (TYPE_MODE (TREE_TYPE (exp)));
1361 switch (DECL_FUNCTION_CODE (fndecl))
1366 builtin_optab = sin_optab; break;
1370 builtin_optab = cos_optab; break;
1371 case BUILT_IN_FSQRT:
1372 case BUILT_IN_SQRTF:
1373 case BUILT_IN_SQRTL:
1374 builtin_optab = sqrt_optab; break;
1379 /* Compute into TARGET.
1380 Set TARGET to wherever the result comes back. */
1381 target = expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist))),
1382 builtin_optab, op0, target, 0);
1384 /* If we were unable to expand via the builtin, stop the
1385 sequence (without outputting the insns) and return 0, causing
1386 a call to the library function. */
1393 /* If errno must be maintained and if we are not allowing unsafe
1394 math optimizations, check the result. */
1396 if (flag_errno_math && ! flag_unsafe_math_optimizations)
1400 /* Don't define the builtin FP instructions
1401 if your machine is not IEEE. */
1402 if (TARGET_FLOAT_FORMAT != IEEE_FLOAT_FORMAT)
1405 lab1 = gen_label_rtx ();
1407 /* Test the result; if it is NaN, set errno=EDOM because
1408 the argument was not in the domain. */
1409 emit_cmp_and_jump_insns (target, target, EQ, 0, GET_MODE (target),
1414 #ifdef GEN_ERRNO_RTX
1415 rtx errno_rtx = GEN_ERRNO_RTX;
1418 = gen_rtx_MEM (word_mode, gen_rtx_SYMBOL_REF (Pmode, "errno"));
1421 emit_move_insn (errno_rtx, GEN_INT (TARGET_EDOM));
1424 /* We can't set errno=EDOM directly; let the library call do it.
1425 Pop the arguments right away in case the call gets deleted. */
1427 expand_call (exp, target, 0);
1434 /* Output the entire sequence. */
1435 insns = get_insns ();
1442 /* Expand expression EXP which is a call to the strlen builtin. Return 0
1443 if we failed the caller should emit a normal call, otherwise
1444 try to get the result in TARGET, if convenient. */
1447 expand_builtin_strlen (exp, target)
1451 tree arglist = TREE_OPERAND (exp, 1);
1452 enum machine_mode value_mode = TYPE_MODE (TREE_TYPE (exp));
1454 if (!validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
1459 tree src = TREE_VALUE (arglist);
1462 = get_pointer_alignment (src, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
1464 rtx result, src_reg, char_rtx, before_strlen;
1465 enum machine_mode insn_mode = value_mode, char_mode;
1466 enum insn_code icode = CODE_FOR_nothing;
1468 /* If SRC is not a pointer type, don't do this operation inline. */
1472 /* Bail out if we can't compute strlen in the right mode. */
1473 while (insn_mode != VOIDmode)
1475 icode = strlen_optab->handlers[(int) insn_mode].insn_code;
1476 if (icode != CODE_FOR_nothing)
1479 insn_mode = GET_MODE_WIDER_MODE (insn_mode);
1481 if (insn_mode == VOIDmode)
1484 /* Make a place to write the result of the instruction. */
1487 && GET_CODE (result) == REG
1488 && GET_MODE (result) == insn_mode
1489 && REGNO (result) >= FIRST_PSEUDO_REGISTER))
1490 result = gen_reg_rtx (insn_mode);
1492 /* Make a place to hold the source address. We will not expand
1493 the actual source until we are sure that the expansion will
1494 not fail -- there are trees that cannot be expanded twice. */
1495 src_reg = gen_reg_rtx (Pmode);
1497 /* Mark the beginning of the strlen sequence so we can emit the
1498 source operand later. */
1499 before_strlen = get_last_insn();
1501 /* Check the string is readable and has an end. */
1502 if (current_function_check_memory_usage)
1503 emit_library_call (chkr_check_str_libfunc, LCT_CONST_MAKE_BLOCK,
1504 VOIDmode, 2, src_reg, Pmode,
1505 GEN_INT (MEMORY_USE_RO),
1506 TYPE_MODE (integer_type_node));
1508 char_rtx = const0_rtx;
1509 char_mode = insn_data[(int) icode].operand[2].mode;
1510 if (! (*insn_data[(int) icode].operand[2].predicate) (char_rtx,
1512 char_rtx = copy_to_mode_reg (char_mode, char_rtx);
1514 pat = GEN_FCN (icode) (result, gen_rtx_MEM (BLKmode, src_reg),
1515 char_rtx, GEN_INT (align));
1520 /* Now that we are assured of success, expand the source. */
1522 pat = memory_address (BLKmode,
1523 expand_expr (src, src_reg, ptr_mode, EXPAND_SUM));
1525 emit_move_insn (src_reg, pat);
1526 pat = gen_sequence ();
1530 emit_insn_after (pat, before_strlen);
1532 emit_insn_before (pat, get_insns ());
1534 /* Return the value in the proper mode for this function. */
1535 if (GET_MODE (result) == value_mode)
1537 else if (target != 0)
1538 convert_move (target, result, 0);
1540 target = convert_to_mode (value_mode, result, 0);
1546 /* Expand a call to the strstr builtin. Return 0 if we failed the
1547 caller should emit a normal call, otherwise try to get the result
1548 in TARGET, if convenient (and in mode MODE if that's convenient). */
1551 expand_builtin_strstr (arglist, target, mode)
1554 enum machine_mode mode;
1556 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE)
1557 || current_function_check_memory_usage)
1561 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1563 const char *p1, *p2;
1572 const char *r = strstr (p1, p2);
1577 /* Return an offset into the constant string argument. */
1578 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1579 s1, ssize_int (r - p1))),
1580 target, mode, EXPAND_NORMAL);
1584 return expand_expr (s1, target, mode, EXPAND_NORMAL);
1589 fn = built_in_decls[BUILT_IN_STRCHR];
1593 /* New argument list transforming strstr(s1, s2) to
1594 strchr(s1, s2[0]). */
1596 build_tree_list (NULL_TREE, build_int_2 (p2[0], 0));
1597 arglist = tree_cons (NULL_TREE, s1, arglist);
1598 return expand_expr (build_function_call_expr (fn, arglist),
1599 target, mode, EXPAND_NORMAL);
1603 /* Expand a call to the strchr builtin. Return 0 if we failed the
1604 caller should emit a normal call, otherwise try to get the result
1605 in TARGET, if convenient (and in mode MODE if that's convenient). */
1608 expand_builtin_strchr (arglist, target, mode)
1611 enum machine_mode mode;
1613 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE)
1614 || current_function_check_memory_usage)
1618 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1621 if (TREE_CODE (s2) != INTEGER_CST)
1630 if (target_char_cast (s2, &c))
1638 /* Return an offset into the constant string argument. */
1639 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1640 s1, ssize_int (r - p1))),
1641 target, mode, EXPAND_NORMAL);
1644 /* FIXME: Should use here strchrM optab so that ports can optimize
1650 /* Expand a call to the strrchr builtin. Return 0 if we failed the
1651 caller should emit a normal call, otherwise try to get the result
1652 in TARGET, if convenient (and in mode MODE if that's convenient). */
1655 expand_builtin_strrchr (arglist, target, mode)
1658 enum machine_mode mode;
1660 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE)
1661 || current_function_check_memory_usage)
1665 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1669 if (TREE_CODE (s2) != INTEGER_CST)
1678 if (target_char_cast (s2, &c))
1681 r = strrchr (p1, c);
1686 /* Return an offset into the constant string argument. */
1687 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1688 s1, ssize_int (r - p1))),
1689 target, mode, EXPAND_NORMAL);
1692 if (! integer_zerop (s2))
1695 fn = built_in_decls[BUILT_IN_STRCHR];
1699 /* Transform strrchr(s1, '\0') to strchr(s1, '\0'). */
1700 return expand_expr (build_function_call_expr (fn, arglist),
1701 target, mode, EXPAND_NORMAL);
1705 /* Expand a call to the strpbrk builtin. Return 0 if we failed the
1706 caller should emit a normal call, otherwise try to get the result
1707 in TARGET, if convenient (and in mode MODE if that's convenient). */
1710 expand_builtin_strpbrk (arglist, target, mode)
1713 enum machine_mode mode;
1715 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE)
1716 || current_function_check_memory_usage)
1720 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1722 const char *p1, *p2;
1731 const char *r = strpbrk (p1, p2);
1736 /* Return an offset into the constant string argument. */
1737 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1738 s1, ssize_int (r - p1))),
1739 target, mode, EXPAND_NORMAL);
1744 /* strpbrk(x, "") == NULL.
1745 Evaluate and ignore the arguments in case they had
1747 expand_expr (s1, const0_rtx, VOIDmode, EXPAND_NORMAL);
1752 return 0; /* Really call strpbrk. */
1754 fn = built_in_decls[BUILT_IN_STRCHR];
1758 /* New argument list transforming strpbrk(s1, s2) to
1759 strchr(s1, s2[0]). */
1761 build_tree_list (NULL_TREE, build_int_2 (p2[0], 0));
1762 arglist = tree_cons (NULL_TREE, s1, arglist);
1763 return expand_expr (build_function_call_expr (fn, arglist),
1764 target, mode, EXPAND_NORMAL);
1768 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
1769 bytes from constant string DATA + OFFSET and return it as target
1773 builtin_memcpy_read_str (data, offset, mode)
1775 HOST_WIDE_INT offset;
1776 enum machine_mode mode;
1778 const char *str = (const char *) data;
1781 || ((unsigned HOST_WIDE_INT) offset + GET_MODE_SIZE (mode)
1782 > strlen (str) + 1))
1783 abort (); /* Attempt to read past the end of constant string. */
1785 return c_readstr (str + offset, mode);
1788 /* Expand a call to the memcpy builtin, with arguments in ARGLIST. */
1791 expand_builtin_memcpy (arglist)
1794 if (!validate_arglist (arglist,
1795 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
1799 tree dest = TREE_VALUE (arglist);
1800 tree src = TREE_VALUE (TREE_CHAIN (arglist));
1801 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
1802 const char *src_str;
1804 unsigned int src_align = get_pointer_alignment (src, BIGGEST_ALIGNMENT);
1805 unsigned int dest_align
1806 = get_pointer_alignment (dest, BIGGEST_ALIGNMENT);
1807 rtx dest_mem, src_mem, dest_addr, len_rtx;
1809 /* If either SRC or DEST is not a pointer type, don't do
1810 this operation in-line. */
1811 if (src_align == 0 || dest_align == 0)
1814 dest_mem = get_memory_rtx (dest);
1815 len_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
1816 src_str = c_getstr (src);
1818 /* If SRC is a string constant and block move would be done
1819 by pieces, we can avoid loading the string from memory
1820 and only stored the computed constants. */
1822 && !current_function_check_memory_usage
1823 && GET_CODE (len_rtx) == CONST_INT
1824 && (unsigned HOST_WIDE_INT) INTVAL (len_rtx) <= strlen (src_str) + 1
1825 && can_store_by_pieces (INTVAL (len_rtx), builtin_memcpy_read_str,
1826 (PTR) src_str, dest_align))
1828 store_by_pieces (dest_mem, INTVAL (len_rtx),
1829 builtin_memcpy_read_str,
1830 (PTR) src_str, dest_align);
1831 return force_operand (XEXP (dest_mem, 0), NULL_RTX);
1834 src_mem = get_memory_rtx (src);
1836 /* Just copy the rights of SRC to the rights of DEST. */
1837 if (current_function_check_memory_usage)
1838 emit_library_call (chkr_copy_bitmap_libfunc, LCT_CONST_MAKE_BLOCK,
1839 VOIDmode, 3, XEXP (dest_mem, 0), Pmode,
1840 XEXP (src_mem, 0), Pmode,
1841 len_rtx, TYPE_MODE (sizetype));
1843 /* Copy word part most expediently. */
1845 = emit_block_move (dest_mem, src_mem, len_rtx,
1846 MIN (src_align, dest_align));
1849 dest_addr = force_operand (XEXP (dest_mem, 0), NULL_RTX);
1855 /* Expand expression EXP, which is a call to the strcpy builtin. Return 0
1856 if we failed the caller should emit a normal call. */
1859 expand_builtin_strcpy (exp)
1862 tree arglist = TREE_OPERAND (exp, 1);
1865 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
1869 tree len = c_strlen (TREE_VALUE (TREE_CHAIN (arglist)));
1874 len = size_binop (PLUS_EXPR, len, ssize_int (1));
1875 chainon (arglist, build_tree_list (NULL_TREE, len));
1878 result = expand_builtin_memcpy (arglist);
1881 TREE_CHAIN (TREE_CHAIN (arglist)) = 0;
1885 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
1886 bytes from constant string DATA + OFFSET and return it as target
1890 builtin_strncpy_read_str (data, offset, mode)
1892 HOST_WIDE_INT offset;
1893 enum machine_mode mode;
1895 const char *str = (const char *) data;
1897 if ((unsigned HOST_WIDE_INT) offset > strlen (str))
1900 return c_readstr (str + offset, mode);
1903 /* Expand expression EXP, which is a call to the strncpy builtin. Return 0
1904 if we failed the caller should emit a normal call. */
1907 expand_builtin_strncpy (arglist, target, mode)
1910 enum machine_mode mode;
1912 if (!validate_arglist (arglist,
1913 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
1917 tree slen = c_strlen (TREE_VALUE (TREE_CHAIN (arglist)));
1918 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
1920 /* We must be passed a constant len parameter. */
1921 if (TREE_CODE (len) != INTEGER_CST)
1924 /* If the len parameter is zero, return the dst parameter. */
1925 if (compare_tree_int (len, 0) == 0)
1927 /* Evaluate and ignore the src argument in case it has
1929 expand_expr (TREE_VALUE (TREE_CHAIN (arglist)), const0_rtx,
1930 VOIDmode, EXPAND_NORMAL);
1931 /* Return the dst parameter. */
1932 return expand_expr (TREE_VALUE (arglist), target, mode,
1936 /* Now, we must be passed a constant src ptr parameter. */
1937 if (slen == 0 || TREE_CODE (slen) != INTEGER_CST)
1940 slen = size_binop (PLUS_EXPR, slen, ssize_int (1));
1942 /* We're required to pad with trailing zeros if the requested
1943 len is greater than strlen(s2)+1. In that case try to
1944 use store_by_pieces, if it fails, punt. */
1945 if (tree_int_cst_lt (slen, len))
1947 tree dest = TREE_VALUE (arglist);
1948 unsigned int dest_align
1949 = get_pointer_alignment (dest, BIGGEST_ALIGNMENT);
1950 const char *p = c_getstr (TREE_VALUE (TREE_CHAIN (arglist)));
1953 if (!p || dest_align == 0 || !host_integerp (len, 1)
1954 || !can_store_by_pieces (tree_low_cst (len, 1),
1955 builtin_strncpy_read_str,
1956 (PTR) p, dest_align))
1959 dest_mem = get_memory_rtx (dest);
1960 store_by_pieces (dest_mem, tree_low_cst (len, 1),
1961 builtin_strncpy_read_str,
1962 (PTR) p, dest_align);
1963 return force_operand (XEXP (dest_mem, 0), NULL_RTX);
1966 /* OK transform into builtin memcpy. */
1967 return expand_builtin_memcpy (arglist);
1971 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
1972 bytes from constant string DATA + OFFSET and return it as target
1976 builtin_memset_read_str (data, offset, mode)
1978 HOST_WIDE_INT offset ATTRIBUTE_UNUSED;
1979 enum machine_mode mode;
1981 const char *c = (const char *) data;
1982 char *p = alloca (GET_MODE_SIZE (mode));
1984 memset (p, *c, GET_MODE_SIZE (mode));
1986 return c_readstr (p, mode);
1989 /* Expand expression EXP, which is a call to the memset builtin. Return 0
1990 if we failed the caller should emit a normal call. */
1993 expand_builtin_memset (exp)
1996 tree arglist = TREE_OPERAND (exp, 1);
1998 if (!validate_arglist (arglist,
1999 POINTER_TYPE, INTEGER_TYPE, INTEGER_TYPE, VOID_TYPE))
2003 tree dest = TREE_VALUE (arglist);
2004 tree val = TREE_VALUE (TREE_CHAIN (arglist));
2005 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2008 unsigned int dest_align
2009 = get_pointer_alignment (dest, BIGGEST_ALIGNMENT);
2010 rtx dest_mem, dest_addr, len_rtx;
2012 /* If DEST is not a pointer type, don't do this
2013 operation in-line. */
2014 if (dest_align == 0)
2017 if (TREE_CODE (val) != INTEGER_CST)
2020 if (target_char_cast (val, &c))
2025 if (!host_integerp (len, 1))
2027 if (current_function_check_memory_usage
2028 || !can_store_by_pieces (tree_low_cst (len, 1),
2029 builtin_memset_read_str,
2030 (PTR) &c, dest_align))
2033 dest_mem = get_memory_rtx (dest);
2034 store_by_pieces (dest_mem, tree_low_cst (len, 1),
2035 builtin_memset_read_str,
2036 (PTR) &c, dest_align);
2037 return force_operand (XEXP (dest_mem, 0), NULL_RTX);
2040 len_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
2042 dest_mem = get_memory_rtx (dest);
2044 /* Just check DST is writable and mark it as readable. */
2045 if (current_function_check_memory_usage)
2046 emit_library_call (chkr_check_addr_libfunc, LCT_CONST_MAKE_BLOCK,
2047 VOIDmode, 3, XEXP (dest_mem, 0), Pmode,
2048 len_rtx, TYPE_MODE (sizetype),
2049 GEN_INT (MEMORY_USE_WO),
2050 TYPE_MODE (integer_type_node));
2053 dest_addr = clear_storage (dest_mem, len_rtx, dest_align);
2056 dest_addr = force_operand (XEXP (dest_mem, 0), NULL_RTX);
2062 /* Expand expression EXP, which is a call to the bzero builtin. Return 0
2063 if we failed the caller should emit a normal call. */
2066 expand_builtin_bzero (exp)
2069 tree arglist = TREE_OPERAND (exp, 1);
2070 tree dest, size, newarglist;
2073 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2076 dest = TREE_VALUE (arglist);
2077 size = TREE_VALUE (TREE_CHAIN (arglist));
2079 /* New argument list transforming bzero(ptr x, int y) to
2080 memset(ptr x, int 0, size_t y). */
2082 newarglist = build_tree_list (NULL_TREE, convert (sizetype, size));
2083 newarglist = tree_cons (NULL_TREE, integer_zero_node, newarglist);
2084 newarglist = tree_cons (NULL_TREE, dest, newarglist);
2086 TREE_OPERAND (exp, 1) = newarglist;
2087 result = expand_builtin_memset(exp);
2089 /* Always restore the original arguments. */
2090 TREE_OPERAND (exp, 1) = arglist;
2095 #ifdef HAVE_cmpstrsi
2097 /* Expand expression EXP, which is a call to the memcmp or the strcmp builtin.
2098 ARGLIST is the argument list for this call. Return 0 if we failed and the
2099 caller should emit a normal call, otherwise try to get the result in
2100 TARGET, if convenient. */
2103 expand_builtin_memcmp (exp, arglist, target)
2108 /* If we need to check memory accesses, call the library function. */
2109 if (current_function_check_memory_usage)
2112 if (!validate_arglist (arglist,
2113 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2117 enum machine_mode mode;
2118 tree arg1 = TREE_VALUE (arglist);
2119 tree arg2 = TREE_VALUE (TREE_CHAIN (arglist));
2120 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2121 rtx arg1_rtx, arg2_rtx, arg3_rtx;
2126 = get_pointer_alignment (arg1, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
2128 = get_pointer_alignment (arg2, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
2129 enum machine_mode insn_mode
2130 = insn_data[(int) CODE_FOR_cmpstrsi].operand[0].mode;
2132 /* If we don't have POINTER_TYPE, call the function. */
2133 if (arg1_align == 0 || arg2_align == 0)
2136 /* Make a place to write the result of the instruction. */
2139 && GET_CODE (result) == REG && GET_MODE (result) == insn_mode
2140 && REGNO (result) >= FIRST_PSEUDO_REGISTER))
2141 result = gen_reg_rtx (insn_mode);
2143 arg1_rtx = get_memory_rtx (arg1);
2144 arg2_rtx = get_memory_rtx (arg2);
2145 arg3_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
2149 insn = gen_cmpstrsi (result, arg1_rtx, arg2_rtx, arg3_rtx,
2150 GEN_INT (MIN (arg1_align, arg2_align)));
2155 emit_library_call_value (memcmp_libfunc, result, LCT_PURE_MAKE_BLOCK,
2156 TYPE_MODE (integer_type_node), 3,
2157 XEXP (arg1_rtx, 0), Pmode,
2158 XEXP (arg2_rtx, 0), Pmode,
2159 convert_to_mode (TYPE_MODE (sizetype), arg3_rtx,
2160 TREE_UNSIGNED (sizetype)),
2161 TYPE_MODE (sizetype));
2163 /* Return the value in the proper mode for this function. */
2164 mode = TYPE_MODE (TREE_TYPE (exp));
2165 if (GET_MODE (result) == mode)
2167 else if (target != 0)
2169 convert_move (target, result, 0);
2173 return convert_to_mode (mode, result, 0);
2178 /* Expand expression EXP, which is a call to the strcmp builtin. Return 0
2179 if we failed the caller should emit a normal call, otherwise try to get
2180 the result in TARGET, if convenient. */
2183 expand_builtin_strcmp (exp, target, mode)
2186 enum machine_mode mode;
2188 tree arglist = TREE_OPERAND (exp, 1);
2190 const char *p1, *p2;
2192 /* If we need to check memory accesses, call the library function. */
2193 if (current_function_check_memory_usage)
2196 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2199 arg1 = TREE_VALUE (arglist);
2200 arg2 = TREE_VALUE (TREE_CHAIN (arglist));
2202 p1 = c_getstr (arg1);
2203 p2 = c_getstr (arg2);
2207 const int i = strcmp (p1, p2);
2208 return (i < 0 ? constm1_rtx : (i > 0 ? const1_rtx : const0_rtx));
2211 /* If either arg is "", return an expression corresponding to
2212 (*(const unsigned char*)arg1 - (const unsigned char*)arg2). */
2213 if ((p1 && *p1 == '\0') || (p2 && *p2 == '\0'))
2215 tree cst_uchar_node = build_type_variant (unsigned_char_type_node, 1, 0);
2216 tree cst_uchar_ptr_node = build_pointer_type (cst_uchar_node);
2218 fold (build1 (CONVERT_EXPR, integer_type_node,
2219 build1 (INDIRECT_REF, cst_uchar_node,
2220 build1 (NOP_EXPR, cst_uchar_ptr_node, arg1))));
2222 fold (build1 (CONVERT_EXPR, integer_type_node,
2223 build1 (INDIRECT_REF, cst_uchar_node,
2224 build1 (NOP_EXPR, cst_uchar_ptr_node, arg2))));
2225 tree result = fold (build (MINUS_EXPR, integer_type_node, ind1, ind2));
2226 return expand_expr (result, target, mode, EXPAND_NORMAL);
2229 #ifdef HAVE_cmpstrsi
2230 if (! HAVE_cmpstrsi)
2234 tree len = c_strlen (arg1);
2235 tree len2 = c_strlen (arg2);
2239 len = size_binop (PLUS_EXPR, ssize_int (1), len);
2242 len2 = size_binop (PLUS_EXPR, ssize_int (1), len2);
2244 /* If we don't have a constant length for the first, use the length
2245 of the second, if we know it. We don't require a constant for
2246 this case; some cost analysis could be done if both are available
2247 but neither is constant. For now, assume they're equally cheap
2248 unless one has side effects.
2250 If both strings have constant lengths, use the smaller. This
2251 could arise if optimization results in strcpy being called with
2252 two fixed strings, or if the code was machine-generated. We should
2253 add some code to the `memcmp' handler below to deal with such
2254 situations, someday. */
2256 if (!len || TREE_CODE (len) != INTEGER_CST)
2258 if (len2 && !TREE_SIDE_EFFECTS (len2))
2263 else if (len2 && TREE_CODE (len2) == INTEGER_CST
2264 && tree_int_cst_lt (len2, len))
2267 /* If both arguments have side effects, we cannot optimize. */
2268 if (TREE_SIDE_EFFECTS (len))
2271 chainon (arglist, build_tree_list (NULL_TREE, len));
2272 result = expand_builtin_memcmp (exp, arglist, target);
2274 TREE_CHAIN (TREE_CHAIN (arglist)) = 0;
2283 /* Expand expression EXP, which is a call to the strncmp builtin. Return 0
2284 if we failed the caller should emit a normal call, otherwise try to get
2285 the result in TARGET, if convenient. */
2288 expand_builtin_strncmp (exp, target, mode)
2291 enum machine_mode mode;
2293 tree arglist = TREE_OPERAND (exp, 1);
2294 tree arg1, arg2, arg3;
2295 const char *p1, *p2;
2297 /* If we need to check memory accesses, call the library function. */
2298 if (current_function_check_memory_usage)
2301 if (!validate_arglist (arglist,
2302 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2305 arg1 = TREE_VALUE (arglist);
2306 arg2 = TREE_VALUE (TREE_CHAIN (arglist));
2307 arg3 = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2309 /* If the len parameter is zero, return zero. */
2310 if (host_integerp (arg3, 1) && tree_low_cst (arg3, 1) == 0)
2312 /* Evaluate and ignore arg1 and arg2 in case they have
2314 expand_expr (arg1, const0_rtx, VOIDmode, EXPAND_NORMAL);
2315 expand_expr (arg2, const0_rtx, VOIDmode, EXPAND_NORMAL);
2319 p1 = c_getstr (arg1);
2320 p2 = c_getstr (arg2);
2322 /* If all arguments are constant, evaluate at compile-time. */
2323 if (host_integerp (arg3, 1) && p1 && p2)
2325 const int r = strncmp (p1, p2, tree_low_cst (arg3, 1));
2326 return (r < 0 ? constm1_rtx : (r > 0 ? const1_rtx : const0_rtx));
2329 /* If len == 1 or (either string parameter is "" and (len >= 1)),
2330 return (*(const u_char*)arg1 - *(const u_char*)arg2). */
2331 if (host_integerp (arg3, 1)
2332 && (tree_low_cst (arg3, 1) == 1
2333 || (tree_low_cst (arg3, 1) > 1
2334 && ((p1 && *p1 == '\0') || (p2 && *p2 == '\0')))))
2336 tree cst_uchar_node = build_type_variant (unsigned_char_type_node, 1, 0);
2337 tree cst_uchar_ptr_node = build_pointer_type (cst_uchar_node);
2339 fold (build1 (CONVERT_EXPR, integer_type_node,
2340 build1 (INDIRECT_REF, cst_uchar_node,
2341 build1 (NOP_EXPR, cst_uchar_ptr_node, arg1))));
2343 fold (build1 (CONVERT_EXPR, integer_type_node,
2344 build1 (INDIRECT_REF, cst_uchar_node,
2345 build1 (NOP_EXPR, cst_uchar_ptr_node, arg2))));
2346 tree result = fold (build (MINUS_EXPR, integer_type_node, ind1, ind2));
2347 return expand_expr (result, target, mode, EXPAND_NORMAL);
2350 #ifdef HAVE_cmpstrsi
2351 /* If c_strlen can determine an expression for one of the string
2352 lengths, and it doesn't have side effects, then call
2353 expand_builtin_memcmp() using length MIN(strlen(string)+1, arg3). */
2356 tree newarglist, len = 0;
2358 /* Perhaps one of the strings is really constant, if so prefer
2359 that constant length over the other string's length. */
2361 len = c_strlen (arg1);
2363 len = c_strlen (arg2);
2365 /* If we still don't have a len, try either string arg as long
2366 as they don't have side effects. */
2367 if (!len && !TREE_SIDE_EFFECTS (arg1))
2368 len = c_strlen (arg1);
2369 if (!len && !TREE_SIDE_EFFECTS (arg2))
2370 len = c_strlen (arg2);
2371 /* If we still don't have a length, punt. */
2375 /* Add one to the string length. */
2376 len = fold (size_binop (PLUS_EXPR, len, ssize_int (1)));
2378 /* The actual new length parameter is MIN(len,arg3). */
2379 len = fold (build (MIN_EXPR, TREE_TYPE (len), len, arg3));
2381 newarglist = build_tree_list (NULL_TREE, len);
2382 newarglist = tree_cons (NULL_TREE, arg2, newarglist);
2383 newarglist = tree_cons (NULL_TREE, arg1, newarglist);
2384 return expand_builtin_memcmp (exp, newarglist, target);
2391 /* Expand expression EXP, which is a call to the strcat builtin.
2392 Return 0 if we failed the caller should emit a normal call,
2393 otherwise try to get the result in TARGET, if convenient. */
2396 expand_builtin_strcat (arglist, target, mode)
2399 enum machine_mode mode;
2401 /* If we need to check memory accesses, call the library function. */
2402 if (current_function_check_memory_usage)
2405 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2409 tree dst = TREE_VALUE (arglist),
2410 src = TREE_VALUE (TREE_CHAIN (arglist));
2411 const char *p = c_getstr (src);
2413 /* If the string length is zero, return the dst parameter. */
2414 if (p && *p == '\0')
2415 return expand_expr (dst, target, mode, EXPAND_NORMAL);
2421 /* Expand expression EXP, which is a call to the strncat builtin.
2422 Return 0 if we failed the caller should emit a normal call,
2423 otherwise try to get the result in TARGET, if convenient. */
2426 expand_builtin_strncat (arglist, target, mode)
2429 enum machine_mode mode;
2431 /* If we need to check memory accesses, call the library function. */
2432 if (current_function_check_memory_usage)
2435 if (!validate_arglist (arglist,
2436 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2440 tree dst = TREE_VALUE (arglist),
2441 src = TREE_VALUE (TREE_CHAIN (arglist)),
2442 len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2443 const char *p = c_getstr (src);
2445 /* If the requested length is zero, or the src parameter string
2446 length is zero, return the dst parameter. */
2447 if ((TREE_CODE (len) == INTEGER_CST && compare_tree_int (len, 0) == 0)
2448 || (p && *p == '\0'))
2450 /* Evaluate and ignore the src and len parameters in case
2451 they have side-effects. */
2452 expand_expr (src, const0_rtx, VOIDmode, EXPAND_NORMAL);
2453 expand_expr (len, const0_rtx, VOIDmode, EXPAND_NORMAL);
2454 return expand_expr (dst, target, mode, EXPAND_NORMAL);
2457 /* If the requested len is greater than or equal to the string
2458 length, call strcat. */
2459 if (TREE_CODE (len) == INTEGER_CST && p
2460 && compare_tree_int (len, strlen (p)) >= 0)
2463 tree_cons (NULL_TREE, dst, build_tree_list (NULL_TREE, src)),
2464 fn = built_in_decls[BUILT_IN_STRCAT];
2466 /* If the replacement _DECL isn't initialized, don't do the
2471 return expand_expr (build_function_call_expr (fn, newarglist),
2472 target, mode, EXPAND_NORMAL);
2478 /* Expand expression EXP, which is a call to the strspn builtin.
2479 Return 0 if we failed the caller should emit a normal call,
2480 otherwise try to get the result in TARGET, if convenient. */
2483 expand_builtin_strspn (arglist, target, mode)
2486 enum machine_mode mode;
2488 /* If we need to check memory accesses, call the library function. */
2489 if (current_function_check_memory_usage)
2492 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2496 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
2497 const char *p1 = c_getstr (s1), *p2 = c_getstr (s2);
2499 /* If both arguments are constants, evaluate at compile-time. */
2502 const size_t r = strspn (p1, p2);
2503 return expand_expr (size_int (r), target, mode, EXPAND_NORMAL);
2506 /* If either argument is "", return 0. */
2507 if ((p1 && *p1 == '\0') || (p2 && *p2 == '\0'))
2509 /* Evaluate and ignore both arguments in case either one has
2511 expand_expr (s1, const0_rtx, VOIDmode, EXPAND_NORMAL);
2512 expand_expr (s2, const0_rtx, VOIDmode, EXPAND_NORMAL);
2519 /* Expand expression EXP, which is a call to the strcspn builtin.
2520 Return 0 if we failed the caller should emit a normal call,
2521 otherwise try to get the result in TARGET, if convenient. */
2524 expand_builtin_strcspn (arglist, target, mode)
2527 enum machine_mode mode;
2529 /* If we need to check memory accesses, call the library function. */
2530 if (current_function_check_memory_usage)
2533 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2537 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
2538 const char *p1 = c_getstr (s1), *p2 = c_getstr (s2);
2540 /* If both arguments are constants, evaluate at compile-time. */
2543 const size_t r = strcspn (p1, p2);
2544 return expand_expr (size_int (r), target, mode, EXPAND_NORMAL);
2547 /* If the first argument is "", return 0. */
2548 if (p1 && *p1 == '\0')
2550 /* Evaluate and ignore argument s2 in case it has
2552 expand_expr (s2, const0_rtx, VOIDmode, EXPAND_NORMAL);
2556 /* If the second argument is "", return __builtin_strlen(s1). */
2557 if (p2 && *p2 == '\0')
2559 tree newarglist = build_tree_list (NULL_TREE, s1),
2560 fn = built_in_decls[BUILT_IN_STRLEN];
2562 /* If the replacement _DECL isn't initialized, don't do the
2567 return expand_expr (build_function_call_expr (fn, newarglist),
2568 target, mode, EXPAND_NORMAL);
2574 /* Expand a call to __builtin_saveregs, generating the result in TARGET,
2575 if that's convenient. */
2578 expand_builtin_saveregs ()
2582 /* Don't do __builtin_saveregs more than once in a function.
2583 Save the result of the first call and reuse it. */
2584 if (saveregs_value != 0)
2585 return saveregs_value;
2587 /* When this function is called, it means that registers must be
2588 saved on entry to this function. So we migrate the call to the
2589 first insn of this function. */
2593 #ifdef EXPAND_BUILTIN_SAVEREGS
2594 /* Do whatever the machine needs done in this case. */
2595 val = EXPAND_BUILTIN_SAVEREGS ();
2597 /* ??? We used to try and build up a call to the out of line function,
2598 guessing about what registers needed saving etc. This became much
2599 harder with __builtin_va_start, since we don't have a tree for a
2600 call to __builtin_saveregs to fall back on. There was exactly one
2601 port (i860) that used this code, and I'm unconvinced it could actually
2602 handle the general case. So we no longer try to handle anything
2603 weird and make the backend absorb the evil. */
2605 error ("__builtin_saveregs not supported by this target");
2612 saveregs_value = val;
2614 /* Put the sequence after the NOTE that starts the function. If this
2615 is inside a SEQUENCE, make the outer-level insn chain current, so
2616 the code is placed at the start of the function. */
2617 push_topmost_sequence ();
2618 emit_insns_after (seq, get_insns ());
2619 pop_topmost_sequence ();
2624 /* __builtin_args_info (N) returns word N of the arg space info
2625 for the current function. The number and meanings of words
2626 is controlled by the definition of CUMULATIVE_ARGS. */
2629 expand_builtin_args_info (exp)
2632 tree arglist = TREE_OPERAND (exp, 1);
2633 int nwords = sizeof (CUMULATIVE_ARGS) / sizeof (int);
2634 int *word_ptr = (int *) ¤t_function_args_info;
2636 /* These are used by the code below that is if 0'ed away */
2638 tree type, elts, result;
2641 if (sizeof (CUMULATIVE_ARGS) % sizeof (int) != 0)
2646 if (!host_integerp (TREE_VALUE (arglist), 0))
2647 error ("argument of `__builtin_args_info' must be constant");
2650 HOST_WIDE_INT wordnum = tree_low_cst (TREE_VALUE (arglist), 0);
2652 if (wordnum < 0 || wordnum >= nwords)
2653 error ("argument of `__builtin_args_info' out of range");
2655 return GEN_INT (word_ptr[wordnum]);
2659 error ("missing argument in `__builtin_args_info'");
2664 for (i = 0; i < nwords; i++)
2665 elts = tree_cons (NULL_TREE, build_int_2 (word_ptr[i], 0));
2667 type = build_array_type (integer_type_node,
2668 build_index_type (build_int_2 (nwords, 0)));
2669 result = build (CONSTRUCTOR, type, NULL_TREE, nreverse (elts));
2670 TREE_CONSTANT (result) = 1;
2671 TREE_STATIC (result) = 1;
2672 result = build1 (INDIRECT_REF, build_pointer_type (type), result);
2673 TREE_CONSTANT (result) = 1;
2674 return expand_expr (result, NULL_RTX, VOIDmode, EXPAND_MEMORY_USE_BAD);
2678 /* Expand ARGLIST, from a call to __builtin_next_arg. */
2681 expand_builtin_next_arg (arglist)
2684 tree fntype = TREE_TYPE (current_function_decl);
2686 if ((TYPE_ARG_TYPES (fntype) == 0
2687 || (TREE_VALUE (tree_last (TYPE_ARG_TYPES (fntype)))
2689 && ! current_function_varargs)
2691 error ("`va_start' used in function with fixed args");
2697 tree last_parm = tree_last (DECL_ARGUMENTS (current_function_decl));
2698 tree arg = TREE_VALUE (arglist);
2700 /* Strip off all nops for the sake of the comparison. This
2701 is not quite the same as STRIP_NOPS. It does more.
2702 We must also strip off INDIRECT_EXPR for C++ reference
2704 while (TREE_CODE (arg) == NOP_EXPR
2705 || TREE_CODE (arg) == CONVERT_EXPR
2706 || TREE_CODE (arg) == NON_LVALUE_EXPR
2707 || TREE_CODE (arg) == INDIRECT_REF)
2708 arg = TREE_OPERAND (arg, 0);
2709 if (arg != last_parm)
2710 warning ("second parameter of `va_start' not last named argument");
2712 else if (! current_function_varargs)
2713 /* Evidently an out of date version of <stdarg.h>; can't validate
2714 va_start's second argument, but can still work as intended. */
2715 warning ("`__builtin_next_arg' called without an argument");
2717 return expand_binop (Pmode, add_optab,
2718 current_function_internal_arg_pointer,
2719 current_function_arg_offset_rtx,
2720 NULL_RTX, 0, OPTAB_LIB_WIDEN);
2723 /* Make it easier for the backends by protecting the valist argument
2724 from multiple evaluations. */
2727 stabilize_va_list (valist, needs_lvalue)
2731 if (TREE_CODE (va_list_type_node) == ARRAY_TYPE)
2733 if (TREE_SIDE_EFFECTS (valist))
2734 valist = save_expr (valist);
2736 /* For this case, the backends will be expecting a pointer to
2737 TREE_TYPE (va_list_type_node), but it's possible we've
2738 actually been given an array (an actual va_list_type_node).
2740 if (TREE_CODE (TREE_TYPE (valist)) == ARRAY_TYPE)
2742 tree p1 = build_pointer_type (TREE_TYPE (va_list_type_node));
2743 tree p2 = build_pointer_type (va_list_type_node);
2745 valist = build1 (ADDR_EXPR, p2, valist);
2746 valist = fold (build1 (NOP_EXPR, p1, valist));
2755 if (! TREE_SIDE_EFFECTS (valist))
2758 pt = build_pointer_type (va_list_type_node);
2759 valist = fold (build1 (ADDR_EXPR, pt, valist));
2760 TREE_SIDE_EFFECTS (valist) = 1;
2763 if (TREE_SIDE_EFFECTS (valist))
2764 valist = save_expr (valist);
2765 valist = fold (build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (valist)),
2772 /* The "standard" implementation of va_start: just assign `nextarg' to
2776 std_expand_builtin_va_start (stdarg_p, valist, nextarg)
2785 /* The dummy named parameter is declared as a 'word' sized
2786 object, but if a 'word' is smaller than an 'int', it would
2787 have been promoted to int when it was added to the arglist. */
2788 int align = PARM_BOUNDARY / BITS_PER_UNIT;
2789 int size = MAX (UNITS_PER_WORD,
2790 GET_MODE_SIZE (TYPE_MODE (integer_type_node)));
2791 int offset = ((size + align - 1) / align) * align;
2792 nextarg = plus_constant (nextarg, -offset);
2795 t = build (MODIFY_EXPR, TREE_TYPE (valist), valist,
2796 make_tree (ptr_type_node, nextarg));
2797 TREE_SIDE_EFFECTS (t) = 1;
2799 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
2802 /* Expand ARGLIST, which from a call to __builtin_stdarg_va_start or
2803 __builtin_varargs_va_start, depending on STDARG_P. */
2806 expand_builtin_va_start (stdarg_p, arglist)
2811 tree chain = arglist, valist;
2814 nextarg = expand_builtin_next_arg (chain = TREE_CHAIN (arglist));
2816 nextarg = expand_builtin_next_arg (NULL_TREE);
2818 if (TREE_CHAIN (chain))
2819 error ("too many arguments to function `va_start'");
2821 valist = stabilize_va_list (TREE_VALUE (arglist), 1);
2823 #ifdef EXPAND_BUILTIN_VA_START
2824 EXPAND_BUILTIN_VA_START (stdarg_p, valist, nextarg);
2826 std_expand_builtin_va_start (stdarg_p, valist, nextarg);
2832 /* The "standard" implementation of va_arg: read the value from the
2833 current (padded) address and increment by the (padded) size. */
2836 std_expand_builtin_va_arg (valist, type)
2840 HOST_WIDE_INT align;
2841 HOST_WIDE_INT rounded_size;
2844 /* Compute the rounded size of the type. */
2845 align = PARM_BOUNDARY / BITS_PER_UNIT;
2846 rounded_size = (((int_size_in_bytes (type) + align - 1) / align) * align);
2850 if (PAD_VARARGS_DOWN)
2852 /* Small args are padded downward. */
2855 = rounded_size > align ? rounded_size : int_size_in_bytes (type);
2857 addr_tree = build (PLUS_EXPR, TREE_TYPE (addr_tree), addr_tree,
2858 build_int_2 (rounded_size - adj, 0));
2861 addr = expand_expr (addr_tree, NULL_RTX, Pmode, EXPAND_NORMAL);
2862 addr = copy_to_reg (addr);
2864 /* Compute new value for AP. */
2865 t = build (MODIFY_EXPR, TREE_TYPE (valist), valist,
2866 build (PLUS_EXPR, TREE_TYPE (valist), valist,
2867 build_int_2 (rounded_size, 0)));
2868 TREE_SIDE_EFFECTS (t) = 1;
2869 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
2874 /* Expand __builtin_va_arg, which is not really a builtin function, but
2875 a very special sort of operator. */
2878 expand_builtin_va_arg (valist, type)
2882 tree promoted_type, want_va_type, have_va_type;
2884 /* Verify that valist is of the proper type. */
2886 want_va_type = va_list_type_node;
2887 have_va_type = TREE_TYPE (valist);
2888 if (TREE_CODE (want_va_type) == ARRAY_TYPE)
2890 /* If va_list is an array type, the argument may have decayed
2891 to a pointer type, e.g. by being passed to another function.
2892 In that case, unwrap both types so that we can compare the
2893 underlying records. */
2894 if (TREE_CODE (have_va_type) == ARRAY_TYPE
2895 || TREE_CODE (have_va_type) == POINTER_TYPE)
2897 want_va_type = TREE_TYPE (want_va_type);
2898 have_va_type = TREE_TYPE (have_va_type);
2901 if (TYPE_MAIN_VARIANT (want_va_type) != TYPE_MAIN_VARIANT (have_va_type))
2903 error ("first argument to `va_arg' not of type `va_list'");
2907 /* Generate a diagnostic for requesting data of a type that cannot
2908 be passed through `...' due to type promotion at the call site. */
2909 else if ((promoted_type = (*lang_type_promotes_to) (type)) != NULL_TREE)
2911 const char *name = "<anonymous type>", *pname = 0;
2912 static int gave_help;
2914 if (TYPE_NAME (type))
2916 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
2917 name = IDENTIFIER_POINTER (TYPE_NAME (type));
2918 else if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
2919 && DECL_NAME (TYPE_NAME (type)))
2920 name = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type)));
2922 if (TYPE_NAME (promoted_type))
2924 if (TREE_CODE (TYPE_NAME (promoted_type)) == IDENTIFIER_NODE)
2925 pname = IDENTIFIER_POINTER (TYPE_NAME (promoted_type));
2926 else if (TREE_CODE (TYPE_NAME (promoted_type)) == TYPE_DECL
2927 && DECL_NAME (TYPE_NAME (promoted_type)))
2928 pname = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (promoted_type)));
2931 error ("`%s' is promoted to `%s' when passed through `...'", name, pname);
2935 error ("(so you should pass `%s' not `%s' to `va_arg')", pname, name);
2942 /* Make it easier for the backends by protecting the valist argument
2943 from multiple evaluations. */
2944 valist = stabilize_va_list (valist, 0);
2946 #ifdef EXPAND_BUILTIN_VA_ARG
2947 addr = EXPAND_BUILTIN_VA_ARG (valist, type);
2949 addr = std_expand_builtin_va_arg (valist, type);
2953 result = gen_rtx_MEM (TYPE_MODE (type), addr);
2954 set_mem_alias_set (result, get_varargs_alias_set ());
2959 /* Expand ARGLIST, from a call to __builtin_va_end. */
2962 expand_builtin_va_end (arglist)
2965 tree valist = TREE_VALUE (arglist);
2967 #ifdef EXPAND_BUILTIN_VA_END
2968 valist = stabilize_va_list (valist, 0);
2969 EXPAND_BUILTIN_VA_END(arglist);
2971 /* Evaluate for side effects, if needed. I hate macros that don't
2973 if (TREE_SIDE_EFFECTS (valist))
2974 expand_expr (valist, const0_rtx, VOIDmode, EXPAND_NORMAL);
2980 /* Expand ARGLIST, from a call to __builtin_va_copy. We do this as a
2981 builtin rather than just as an assignment in stdarg.h because of the
2982 nastiness of array-type va_list types. */
2985 expand_builtin_va_copy (arglist)
2990 dst = TREE_VALUE (arglist);
2991 src = TREE_VALUE (TREE_CHAIN (arglist));
2993 dst = stabilize_va_list (dst, 1);
2994 src = stabilize_va_list (src, 0);
2996 if (TREE_CODE (va_list_type_node) != ARRAY_TYPE)
2998 t = build (MODIFY_EXPR, va_list_type_node, dst, src);
2999 TREE_SIDE_EFFECTS (t) = 1;
3000 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
3004 rtx dstb, srcb, size;
3006 /* Evaluate to pointers. */
3007 dstb = expand_expr (dst, NULL_RTX, Pmode, EXPAND_NORMAL);
3008 srcb = expand_expr (src, NULL_RTX, Pmode, EXPAND_NORMAL);
3009 size = expand_expr (TYPE_SIZE_UNIT (va_list_type_node), NULL_RTX,
3010 VOIDmode, EXPAND_NORMAL);
3012 /* "Dereference" to BLKmode memories. */
3013 dstb = gen_rtx_MEM (BLKmode, dstb);
3014 set_mem_alias_set (dstb, get_alias_set (TREE_TYPE (TREE_TYPE (dst))));
3015 srcb = gen_rtx_MEM (BLKmode, srcb);
3016 set_mem_alias_set (srcb, get_alias_set (TREE_TYPE (TREE_TYPE (src))));
3019 emit_block_move (dstb, srcb, size, TYPE_ALIGN (va_list_type_node));
3025 /* Expand a call to one of the builtin functions __builtin_frame_address or
3026 __builtin_return_address. */
3029 expand_builtin_frame_address (exp)
3032 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
3033 tree arglist = TREE_OPERAND (exp, 1);
3035 /* The argument must be a nonnegative integer constant.
3036 It counts the number of frames to scan up the stack.
3037 The value is the return address saved in that frame. */
3039 /* Warning about missing arg was already issued. */
3041 else if (! host_integerp (TREE_VALUE (arglist), 1))
3043 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
3044 error ("invalid arg to `__builtin_frame_address'");
3046 error ("invalid arg to `__builtin_return_address'");
3052 = expand_builtin_return_addr (DECL_FUNCTION_CODE (fndecl),
3053 tree_low_cst (TREE_VALUE (arglist), 1),
3054 hard_frame_pointer_rtx);
3056 /* Some ports cannot access arbitrary stack frames. */
3059 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
3060 warning ("unsupported arg to `__builtin_frame_address'");
3062 warning ("unsupported arg to `__builtin_return_address'");
3066 /* For __builtin_frame_address, return what we've got. */
3067 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
3070 if (GET_CODE (tem) != REG
3071 && ! CONSTANT_P (tem))
3072 tem = copy_to_mode_reg (Pmode, tem);
3077 /* Expand a call to the alloca builtin, with arguments ARGLIST. Return 0 if
3078 we failed and the caller should emit a normal call, otherwise try to get
3079 the result in TARGET, if convenient. */
3082 expand_builtin_alloca (arglist, target)
3089 if (!validate_arglist (arglist, INTEGER_TYPE, VOID_TYPE))
3092 /* Compute the argument. */
3093 op0 = expand_expr (TREE_VALUE (arglist), NULL_RTX, VOIDmode, 0);
3095 /* Allocate the desired space. */
3096 result = allocate_dynamic_stack_space (op0, target, BITS_PER_UNIT);
3098 #ifdef POINTERS_EXTEND_UNSIGNED
3099 result = convert_memory_address (ptr_mode, result);
3105 /* Expand a call to the ffs builtin. The arguments are in ARGLIST.
3106 Return 0 if a normal call should be emitted rather than expanding the
3107 function in-line. If convenient, the result should be placed in TARGET.
3108 SUBTARGET may be used as the target for computing one of EXP's operands. */
3111 expand_builtin_ffs (arglist, target, subtarget)
3113 rtx target, subtarget;
3116 if (!validate_arglist (arglist, INTEGER_TYPE, VOID_TYPE))
3119 /* Compute the argument. */
3120 op0 = expand_expr (TREE_VALUE (arglist), subtarget, VOIDmode, 0);
3121 /* Compute ffs, into TARGET if possible.
3122 Set TARGET to wherever the result comes back. */
3123 target = expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist))),
3124 ffs_optab, op0, target, 1);
3130 /* If the string passed to fputs is a constant and is one character
3131 long, we attempt to transform this call into __builtin_fputc(). */
3134 expand_builtin_fputs (arglist, ignore)
3138 tree len, fn, fn_fputc = built_in_decls[BUILT_IN_FPUTC],
3139 fn_fwrite = built_in_decls[BUILT_IN_FWRITE];
3141 /* If the return value is used, or the replacement _DECL isn't
3142 initialized, don't do the transformation. */
3143 if (!ignore || !fn_fputc || !fn_fwrite)
3146 /* Verify the arguments in the original call. */
3147 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE)
3148 || current_function_check_memory_usage)
3151 /* Get the length of the string passed to fputs. If the length
3152 can't be determined, punt. */
3153 if (!(len = c_strlen (TREE_VALUE (arglist)))
3154 || TREE_CODE (len) != INTEGER_CST)
3157 switch (compare_tree_int (len, 1))
3159 case -1: /* length is 0, delete the call entirely . */
3161 /* Evaluate and ignore the argument in case it has
3163 expand_expr (TREE_VALUE (TREE_CHAIN (arglist)), const0_rtx,
3164 VOIDmode, EXPAND_NORMAL);
3167 case 0: /* length is 1, call fputc. */
3169 const char *p = c_getstr (TREE_VALUE (arglist));
3173 /* New argument list transforming fputs(string, stream) to
3174 fputc(string[0], stream). */
3176 build_tree_list (NULL_TREE, TREE_VALUE (TREE_CHAIN (arglist)));
3178 tree_cons (NULL_TREE, build_int_2 (p[0], 0), arglist);
3184 case 1: /* length is greater than 1, call fwrite. */
3186 tree string_arg = TREE_VALUE (arglist);
3188 /* New argument list transforming fputs(string, stream) to
3189 fwrite(string, 1, len, stream). */
3190 arglist = build_tree_list (NULL_TREE, TREE_VALUE (TREE_CHAIN (arglist)));
3191 arglist = tree_cons (NULL_TREE, len, arglist);
3192 arglist = tree_cons (NULL_TREE, size_one_node, arglist);
3193 arglist = tree_cons (NULL_TREE, string_arg, arglist);
3201 return expand_expr (build_function_call_expr (fn, arglist),
3202 (ignore ? const0_rtx : NULL_RTX),
3203 VOIDmode, EXPAND_NORMAL);
3206 /* Expand a call to __builtin_expect. We return our argument and emit a
3207 NOTE_INSN_EXPECTED_VALUE note. This is the expansion of __builtin_expect in
3208 a non-jump context. */
3211 expand_builtin_expect (arglist, target)
3218 if (arglist == NULL_TREE
3219 || TREE_CHAIN (arglist) == NULL_TREE)
3221 exp = TREE_VALUE (arglist);
3222 c = TREE_VALUE (TREE_CHAIN (arglist));
3224 if (TREE_CODE (c) != INTEGER_CST)
3226 error ("second arg to `__builtin_expect' must be a constant");
3227 c = integer_zero_node;
3230 target = expand_expr (exp, target, VOIDmode, EXPAND_NORMAL);
3232 /* Don't bother with expected value notes for integral constants. */
3233 if (GET_CODE (target) != CONST_INT)
3235 /* We do need to force this into a register so that we can be
3236 moderately sure to be able to correctly interpret the branch
3238 target = force_reg (GET_MODE (target), target);
3240 rtx_c = expand_expr (c, NULL_RTX, GET_MODE (target), EXPAND_NORMAL);
3242 note = emit_note (NULL, NOTE_INSN_EXPECTED_VALUE);
3243 NOTE_EXPECTED_VALUE (note) = gen_rtx_EQ (VOIDmode, target, rtx_c);
3249 /* Like expand_builtin_expect, except do this in a jump context. This is
3250 called from do_jump if the conditional is a __builtin_expect. Return either
3251 a SEQUENCE of insns to emit the jump or NULL if we cannot optimize
3252 __builtin_expect. We need to optimize this at jump time so that machines
3253 like the PowerPC don't turn the test into a SCC operation, and then jump
3254 based on the test being 0/1. */
3257 expand_builtin_expect_jump (exp, if_false_label, if_true_label)
3262 tree arglist = TREE_OPERAND (exp, 1);
3263 tree arg0 = TREE_VALUE (arglist);
3264 tree arg1 = TREE_VALUE (TREE_CHAIN (arglist));
3267 /* Only handle __builtin_expect (test, 0) and
3268 __builtin_expect (test, 1). */
3269 if (TREE_CODE (TREE_TYPE (arg1)) == INTEGER_TYPE
3270 && (integer_zerop (arg1) || integer_onep (arg1)))
3275 /* If we fail to locate an appropriate conditional jump, we'll
3276 fall back to normal evaluation. Ensure that the expression
3277 can be re-evaluated. */
3278 switch (unsafe_for_reeval (arg0))
3283 case 1: /* Mildly unsafe. */
3284 arg0 = unsave_expr (arg0);
3287 case 2: /* Wildly unsafe. */
3291 /* Expand the jump insns. */
3293 do_jump (arg0, if_false_label, if_true_label);
3294 ret = gen_sequence ();
3297 /* Now that the __builtin_expect has been validated, go through and add
3298 the expect's to each of the conditional jumps. If we run into an
3299 error, just give up and generate the 'safe' code of doing a SCC
3300 operation and then doing a branch on that. */
3301 for (j = 0; j < XVECLEN (ret, 0); j++)
3303 rtx insn = XVECEXP (ret, 0, j);
3306 if (GET_CODE (insn) == JUMP_INSN && any_condjump_p (insn)
3307 && (pattern = pc_set (insn)) != NULL_RTX)
3309 rtx ifelse = SET_SRC (pattern);
3313 if (GET_CODE (ifelse) != IF_THEN_ELSE)
3316 if (GET_CODE (XEXP (ifelse, 1)) == LABEL_REF)
3319 label = XEXP (XEXP (ifelse, 1), 0);
3321 /* An inverted jump reverses the probabilities. */
3322 else if (GET_CODE (XEXP (ifelse, 2)) == LABEL_REF)
3325 label = XEXP (XEXP (ifelse, 2), 0);
3327 /* We shouldn't have to worry about conditional returns during
3328 the expansion stage, but handle it gracefully anyway. */
3329 else if (GET_CODE (XEXP (ifelse, 1)) == RETURN)
3334 /* An inverted return reverses the probabilities. */
3335 else if (GET_CODE (XEXP (ifelse, 2)) == RETURN)
3343 /* If the test is expected to fail, reverse the
3345 if (integer_zerop (arg1))
3348 /* If we are jumping to the false label, reverse the
3350 if (label == NULL_RTX)
3351 ; /* conditional return */
3352 else if (label == if_false_label)
3354 else if (label != if_true_label)
3358 predict_insn_def (insn, PRED_BUILTIN_EXPECT, taken);
3362 /* If no jumps were modified, fail and do __builtin_expect the normal
3371 /* Expand an expression EXP that calls a built-in function,
3372 with result going to TARGET if that's convenient
3373 (and in mode MODE if that's convenient).
3374 SUBTARGET may be used as the target for computing one of EXP's operands.
3375 IGNORE is nonzero if the value is to be ignored. */
3378 expand_builtin (exp, target, subtarget, mode, ignore)
3382 enum machine_mode mode;
3385 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
3386 tree arglist = TREE_OPERAND (exp, 1);
3387 enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
3389 if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_MD)
3390 return (*targetm.expand_builtin) (exp, target, subtarget, mode, ignore);
3392 /* When not optimizing, generate calls to library functions for a certain
3394 if (! optimize && ! CALLED_AS_BUILT_IN (fndecl)
3395 && (fcode == BUILT_IN_SIN || fcode == BUILT_IN_COS
3396 || fcode == BUILT_IN_FSQRT || fcode == BUILT_IN_SQRTF
3397 || fcode == BUILT_IN_SQRTL || fcode == BUILT_IN_MEMSET
3398 || fcode == BUILT_IN_MEMCPY || fcode == BUILT_IN_MEMCMP
3399 || fcode == BUILT_IN_BCMP || fcode == BUILT_IN_BZERO
3400 || fcode == BUILT_IN_INDEX || fcode == BUILT_IN_RINDEX
3401 || fcode == BUILT_IN_STRCHR || fcode == BUILT_IN_STRRCHR
3402 || fcode == BUILT_IN_STRLEN || fcode == BUILT_IN_STRCPY
3403 || fcode == BUILT_IN_STRNCPY || fcode == BUILT_IN_STRNCMP
3404 || fcode == BUILT_IN_STRSTR || fcode == BUILT_IN_STRPBRK
3405 || fcode == BUILT_IN_STRCAT || fcode == BUILT_IN_STRNCAT
3406 || fcode == BUILT_IN_STRSPN || fcode == BUILT_IN_STRCSPN
3407 || fcode == BUILT_IN_STRCMP || fcode == BUILT_IN_FFS
3408 || fcode == BUILT_IN_PUTCHAR || fcode == BUILT_IN_PUTS
3409 || fcode == BUILT_IN_PRINTF || fcode == BUILT_IN_FPUTC
3410 || fcode == BUILT_IN_FPUTS || fcode == BUILT_IN_FWRITE))
3411 return expand_call (exp, target, ignore);
3417 case BUILT_IN_LLABS:
3418 case BUILT_IN_IMAXABS:
3420 case BUILT_IN_FABSF:
3421 case BUILT_IN_FABSL:
3422 /* build_function_call changes these into ABS_EXPR. */
3426 case BUILT_IN_CONJF:
3427 case BUILT_IN_CONJL:
3428 case BUILT_IN_CREAL:
3429 case BUILT_IN_CREALF:
3430 case BUILT_IN_CREALL:
3431 case BUILT_IN_CIMAG:
3432 case BUILT_IN_CIMAGF:
3433 case BUILT_IN_CIMAGL:
3434 /* expand_tree_builtin changes these into CONJ_EXPR, REALPART_EXPR
3435 and IMAGPART_EXPR. */
3444 /* Treat these like sqrt only if unsafe math optimizations are allowed,
3445 because of possible accuracy problems. */
3446 if (! flag_unsafe_math_optimizations)
3448 case BUILT_IN_FSQRT:
3449 case BUILT_IN_SQRTF:
3450 case BUILT_IN_SQRTL:
3451 target = expand_builtin_mathfn (exp, target, subtarget);
3459 case BUILT_IN_APPLY_ARGS:
3460 return expand_builtin_apply_args ();
3462 /* __builtin_apply (FUNCTION, ARGUMENTS, ARGSIZE) invokes
3463 FUNCTION with a copy of the parameters described by
3464 ARGUMENTS, and ARGSIZE. It returns a block of memory
3465 allocated on the stack into which is stored all the registers
3466 that might possibly be used for returning the result of a
3467 function. ARGUMENTS is the value returned by
3468 __builtin_apply_args. ARGSIZE is the number of bytes of
3469 arguments that must be copied. ??? How should this value be
3470 computed? We'll also need a safe worst case value for varargs
3472 case BUILT_IN_APPLY:
3473 if (!validate_arglist (arglist, POINTER_TYPE,
3474 POINTER_TYPE, INTEGER_TYPE, VOID_TYPE)
3475 && !validate_arglist (arglist, REFERENCE_TYPE,
3476 POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
3484 for (t = arglist, i = 0; t; t = TREE_CHAIN (t), i++)
3485 ops[i] = expand_expr (TREE_VALUE (t), NULL_RTX, VOIDmode, 0);
3487 return expand_builtin_apply (ops[0], ops[1], ops[2]);
3490 /* __builtin_return (RESULT) causes the function to return the
3491 value described by RESULT. RESULT is address of the block of
3492 memory returned by __builtin_apply. */
3493 case BUILT_IN_RETURN:
3494 if (validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
3495 expand_builtin_return (expand_expr (TREE_VALUE (arglist),
3496 NULL_RTX, VOIDmode, 0));
3499 case BUILT_IN_SAVEREGS:
3500 return expand_builtin_saveregs ();
3502 case BUILT_IN_ARGS_INFO:
3503 return expand_builtin_args_info (exp);
3505 /* Return the address of the first anonymous stack arg. */
3506 case BUILT_IN_NEXT_ARG:
3507 return expand_builtin_next_arg (arglist);
3509 case BUILT_IN_CLASSIFY_TYPE:
3510 return expand_builtin_classify_type (arglist);
3512 case BUILT_IN_CONSTANT_P:
3513 return expand_builtin_constant_p (exp);
3515 case BUILT_IN_FRAME_ADDRESS:
3516 case BUILT_IN_RETURN_ADDRESS:
3517 return expand_builtin_frame_address (exp);
3519 /* Returns the address of the area where the structure is returned.
3521 case BUILT_IN_AGGREGATE_INCOMING_ADDRESS:
3523 || ! AGGREGATE_TYPE_P (TREE_TYPE (TREE_TYPE (current_function_decl)))
3524 || GET_CODE (DECL_RTL (DECL_RESULT (current_function_decl))) != MEM)
3527 return XEXP (DECL_RTL (DECL_RESULT (current_function_decl)), 0);
3529 case BUILT_IN_ALLOCA:
3530 target = expand_builtin_alloca (arglist, target);
3536 target = expand_builtin_ffs (arglist, target, subtarget);
3541 case BUILT_IN_STRLEN:
3542 target = expand_builtin_strlen (exp, target);
3547 case BUILT_IN_STRCPY:
3548 target = expand_builtin_strcpy (exp);
3553 case BUILT_IN_STRNCPY:
3554 target = expand_builtin_strncpy (arglist, target, mode);
3559 case BUILT_IN_STRCAT:
3560 target = expand_builtin_strcat (arglist, target, mode);
3565 case BUILT_IN_STRNCAT:
3566 target = expand_builtin_strncat (arglist, target, mode);
3571 case BUILT_IN_STRSPN:
3572 target = expand_builtin_strspn (arglist, target, mode);
3577 case BUILT_IN_STRCSPN:
3578 target = expand_builtin_strcspn (arglist, target, mode);
3583 case BUILT_IN_STRSTR:
3584 target = expand_builtin_strstr (arglist, target, mode);
3589 case BUILT_IN_STRPBRK:
3590 target = expand_builtin_strpbrk (arglist, target, mode);
3595 case BUILT_IN_INDEX:
3596 case BUILT_IN_STRCHR:
3597 target = expand_builtin_strchr (arglist, target, mode);
3602 case BUILT_IN_RINDEX:
3603 case BUILT_IN_STRRCHR:
3604 target = expand_builtin_strrchr (arglist, target, mode);
3609 case BUILT_IN_MEMCPY:
3610 target = expand_builtin_memcpy (arglist);
3615 case BUILT_IN_MEMSET:
3616 target = expand_builtin_memset (exp);
3621 case BUILT_IN_BZERO:
3622 target = expand_builtin_bzero (exp);
3627 case BUILT_IN_STRCMP:
3628 target = expand_builtin_strcmp (exp, target, mode);
3633 case BUILT_IN_STRNCMP:
3634 target = expand_builtin_strncmp (exp, target, mode);
3639 /* These comparison functions need an instruction that returns an actual
3640 index. An ordinary compare that just sets the condition codes
3642 #ifdef HAVE_cmpstrsi
3644 case BUILT_IN_MEMCMP:
3645 target = expand_builtin_memcmp (exp, arglist, target);
3651 case BUILT_IN_MEMCMP:
3655 case BUILT_IN_SETJMP:
3656 target = expand_builtin_setjmp (arglist, target);
3661 /* __builtin_longjmp is passed a pointer to an array of five words.
3662 It's similar to the C library longjmp function but works with
3663 __builtin_setjmp above. */
3664 case BUILT_IN_LONGJMP:
3665 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
3669 rtx buf_addr = expand_expr (TREE_VALUE (arglist), subtarget,
3671 rtx value = expand_expr (TREE_VALUE (TREE_CHAIN (arglist)),
3672 NULL_RTX, VOIDmode, 0);
3674 if (value != const1_rtx)
3676 error ("__builtin_longjmp second argument must be 1");
3680 expand_builtin_longjmp (buf_addr, value);
3687 emit_insn (gen_trap ());
3690 error ("__builtin_trap not supported by this target");
3694 case BUILT_IN_PUTCHAR:
3696 case BUILT_IN_FPUTC:
3697 case BUILT_IN_FWRITE:
3699 case BUILT_IN_FPUTS:
3700 target = expand_builtin_fputs (arglist, ignore);
3705 /* Various hooks for the DWARF 2 __throw routine. */
3706 case BUILT_IN_UNWIND_INIT:
3707 expand_builtin_unwind_init ();
3709 case BUILT_IN_DWARF_CFA:
3710 return virtual_cfa_rtx;
3711 #ifdef DWARF2_UNWIND_INFO
3712 case BUILT_IN_DWARF_FP_REGNUM:
3713 return expand_builtin_dwarf_fp_regnum ();
3714 case BUILT_IN_INIT_DWARF_REG_SIZES:
3715 expand_builtin_init_dwarf_reg_sizes (TREE_VALUE (arglist));
3718 case BUILT_IN_FROB_RETURN_ADDR:
3719 return expand_builtin_frob_return_addr (TREE_VALUE (arglist));
3720 case BUILT_IN_EXTRACT_RETURN_ADDR:
3721 return expand_builtin_extract_return_addr (TREE_VALUE (arglist));
3722 case BUILT_IN_EH_RETURN:
3723 expand_builtin_eh_return (TREE_VALUE (arglist),
3724 TREE_VALUE (TREE_CHAIN (arglist)));
3726 #ifdef EH_RETURN_DATA_REGNO
3727 case BUILT_IN_EH_RETURN_DATA_REGNO:
3728 return expand_builtin_eh_return_data_regno (arglist);
3730 case BUILT_IN_VARARGS_START:
3731 return expand_builtin_va_start (0, arglist);
3732 case BUILT_IN_STDARG_START:
3733 return expand_builtin_va_start (1, arglist);
3734 case BUILT_IN_VA_END:
3735 return expand_builtin_va_end (arglist);
3736 case BUILT_IN_VA_COPY:
3737 return expand_builtin_va_copy (arglist);
3738 case BUILT_IN_EXPECT:
3739 return expand_builtin_expect (arglist, target);
3741 default: /* just do library call, if unknown builtin */
3742 error ("built-in function `%s' not currently supported",
3743 IDENTIFIER_POINTER (DECL_NAME (fndecl)));
3746 /* The switch statement above can drop through to cause the function
3747 to be called normally. */
3748 return expand_call (exp, target, ignore);
3751 /* Fold a call to __builtin_constant_p, if we know it will evaluate to a
3752 constant. ARGLIST is the argument list of the call. */
3755 fold_builtin_constant_p (arglist)
3761 arglist = TREE_VALUE (arglist);
3763 /* We return 1 for a numeric type that's known to be a constant
3764 value at compile-time or for an aggregate type that's a
3765 literal constant. */
3766 STRIP_NOPS (arglist);
3768 /* If we know this is a constant, emit the constant of one. */
3769 if (TREE_CODE_CLASS (TREE_CODE (arglist)) == 'c'
3770 || (TREE_CODE (arglist) == CONSTRUCTOR
3771 && TREE_CONSTANT (arglist))
3772 || (TREE_CODE (arglist) == ADDR_EXPR
3773 && TREE_CODE (TREE_OPERAND (arglist, 0)) == STRING_CST))
3774 return integer_one_node;
3776 /* If we aren't going to be running CSE or this expression
3777 has side effects, show we don't know it to be a constant.
3778 Likewise if it's a pointer or aggregate type since in those
3779 case we only want literals, since those are only optimized
3780 when generating RTL, not later.
3781 And finally, if we are compiling an initializer, not code, we
3782 need to return a definite result now; there's not going to be any
3783 more optimization done. */
3784 if (TREE_SIDE_EFFECTS (arglist) || cse_not_expected
3785 || AGGREGATE_TYPE_P (TREE_TYPE (arglist))
3786 || POINTER_TYPE_P (TREE_TYPE (arglist))
3788 return integer_zero_node;
3793 /* Fold a call to __builtin_classify_type. */
3796 fold_builtin_classify_type (arglist)
3800 return build_int_2 (no_type_class, 0);
3802 return build_int_2 (type_to_class (TREE_TYPE (TREE_VALUE (arglist))), 0);
3805 /* Used by constant folding to eliminate some builtin calls early. EXP is
3806 the CALL_EXPR of a call to a builtin function. */
3812 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
3813 tree arglist = TREE_OPERAND (exp, 1);
3814 enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
3816 if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_MD)
3821 case BUILT_IN_CONSTANT_P:
3822 return fold_builtin_constant_p (arglist);
3824 case BUILT_IN_CLASSIFY_TYPE:
3825 return fold_builtin_classify_type (arglist);
3827 case BUILT_IN_STRLEN:
3828 if (validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
3830 tree len = c_strlen (TREE_VALUE (arglist));
3844 build_function_call_expr (fn, arglist)
3849 call_expr = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (fn)), fn);
3850 call_expr = build (CALL_EXPR, TREE_TYPE (TREE_TYPE (fn)),
3851 call_expr, arglist);
3852 TREE_SIDE_EFFECTS (call_expr) = 1;
3853 return fold (call_expr);
3856 /* This function validates the types of a function call argument list
3857 represented as a tree chain of parameters against a specified list
3858 of tree_codes. If the last specifier is a 0, that represents an
3859 ellipses, otherwise the last specifier must be a VOID_TYPE. */
3862 validate_arglist VPARAMS ((tree arglist, ...))
3864 enum tree_code code;
3867 VA_OPEN (ap, arglist);
3868 VA_FIXEDARG (ap, tree, arglist);
3871 code = va_arg (ap, enum tree_code);
3875 /* This signifies an ellipses, any further arguments are all ok. */
3879 /* This signifies an endlink, if no arguments remain, return
3880 true, otherwise return false. */
3884 /* If no parameters remain or the parameter's code does not
3885 match the specified code, return false. Otherwise continue
3886 checking any remaining arguments. */
3887 if (arglist == 0 || code != TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))))
3891 arglist = TREE_CHAIN (arglist);
3894 /* We need gotos here since we can only have one VA_CLOSE in a
3902 /* Default version of target-specific builtin setup that does nothing. */
3905 default_init_builtins ()
3909 /* Default target-specific builtin expander that does nothing. */
3912 default_expand_builtin (exp, target, subtarget, mode, ignore)
3913 tree exp ATTRIBUTE_UNUSED;
3914 rtx target ATTRIBUTE_UNUSED;
3915 rtx subtarget ATTRIBUTE_UNUSED;
3916 enum machine_mode mode ATTRIBUTE_UNUSED;
3917 int ignore ATTRIBUTE_UNUSED;