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 void expand_builtin_prefetch PARAMS ((tree));
91 static rtx expand_builtin_apply_args PARAMS ((void));
92 static rtx expand_builtin_apply_args_1 PARAMS ((void));
93 static rtx expand_builtin_apply PARAMS ((rtx, rtx, rtx));
94 static void expand_builtin_return PARAMS ((rtx));
95 static enum type_class type_to_class PARAMS ((tree));
96 static rtx expand_builtin_classify_type PARAMS ((tree));
97 static rtx expand_builtin_mathfn PARAMS ((tree, rtx, rtx));
98 static rtx expand_builtin_constant_p PARAMS ((tree));
99 static rtx expand_builtin_args_info PARAMS ((tree));
100 static rtx expand_builtin_next_arg PARAMS ((tree));
101 static rtx expand_builtin_va_start PARAMS ((int, tree));
102 static rtx expand_builtin_va_end PARAMS ((tree));
103 static rtx expand_builtin_va_copy PARAMS ((tree));
105 static rtx expand_builtin_memcmp PARAMS ((tree, tree, rtx));
107 static rtx expand_builtin_strcmp PARAMS ((tree, rtx,
109 static rtx expand_builtin_strncmp PARAMS ((tree, rtx,
111 static rtx builtin_memcpy_read_str PARAMS ((PTR, HOST_WIDE_INT,
113 static rtx expand_builtin_strcat PARAMS ((tree, rtx,
115 static rtx expand_builtin_strncat PARAMS ((tree, rtx,
117 static rtx expand_builtin_strspn PARAMS ((tree, rtx,
119 static rtx expand_builtin_strcspn PARAMS ((tree, rtx,
121 static rtx expand_builtin_memcpy PARAMS ((tree));
122 static rtx expand_builtin_strcpy PARAMS ((tree));
123 static rtx builtin_strncpy_read_str PARAMS ((PTR, HOST_WIDE_INT,
125 static rtx expand_builtin_strncpy PARAMS ((tree, rtx,
127 static rtx builtin_memset_read_str PARAMS ((PTR, HOST_WIDE_INT,
129 static rtx expand_builtin_memset PARAMS ((tree));
130 static rtx expand_builtin_bzero PARAMS ((tree));
131 static rtx expand_builtin_strlen PARAMS ((tree, rtx));
132 static rtx expand_builtin_strstr PARAMS ((tree, rtx,
134 static rtx expand_builtin_strpbrk PARAMS ((tree, rtx,
136 static rtx expand_builtin_strchr PARAMS ((tree, rtx,
138 static rtx expand_builtin_strrchr PARAMS ((tree, rtx,
140 static rtx expand_builtin_alloca PARAMS ((tree, rtx));
141 static rtx expand_builtin_ffs PARAMS ((tree, rtx, rtx));
142 static rtx expand_builtin_frame_address PARAMS ((tree));
143 static rtx expand_builtin_fputs PARAMS ((tree, int));
144 static tree stabilize_va_list PARAMS ((tree, int));
145 static rtx expand_builtin_expect PARAMS ((tree, rtx));
146 static tree fold_builtin_constant_p PARAMS ((tree));
147 static tree fold_builtin_classify_type PARAMS ((tree));
148 static tree build_function_call_expr PARAMS ((tree, tree));
149 static int validate_arglist PARAMS ((tree, ...));
151 /* Return the alignment in bits of EXP, a pointer valued expression.
152 But don't return more than MAX_ALIGN no matter what.
153 The alignment returned is, by default, the alignment of the thing that
154 EXP points to. If it is not a POINTER_TYPE, 0 is returned.
156 Otherwise, look at the expression to see if we can do better, i.e., if the
157 expression is actually pointing at an object whose alignment is tighter. */
160 get_pointer_alignment (exp, max_align)
162 unsigned int max_align;
164 unsigned int align, inner;
166 if (TREE_CODE (TREE_TYPE (exp)) != POINTER_TYPE)
169 align = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp)));
170 align = MIN (align, max_align);
174 switch (TREE_CODE (exp))
178 case NON_LVALUE_EXPR:
179 exp = TREE_OPERAND (exp, 0);
180 if (TREE_CODE (TREE_TYPE (exp)) != POINTER_TYPE)
183 inner = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp)));
184 align = MIN (inner, max_align);
188 /* If sum of pointer + int, restrict our maximum alignment to that
189 imposed by the integer. If not, we can't do any better than
191 if (! host_integerp (TREE_OPERAND (exp, 1), 1))
194 while (((tree_low_cst (TREE_OPERAND (exp, 1), 1))
195 & (max_align / BITS_PER_UNIT - 1))
199 exp = TREE_OPERAND (exp, 0);
203 /* See what we are pointing at and look at its alignment. */
204 exp = TREE_OPERAND (exp, 0);
205 if (TREE_CODE (exp) == FUNCTION_DECL)
206 align = FUNCTION_BOUNDARY;
207 else if (DECL_P (exp))
208 align = DECL_ALIGN (exp);
209 #ifdef CONSTANT_ALIGNMENT
210 else if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'c')
211 align = CONSTANT_ALIGNMENT (exp, align);
213 return MIN (align, max_align);
221 /* Compute the length of a C string. TREE_STRING_LENGTH is not the right
222 way, because it could contain a zero byte in the middle.
223 TREE_STRING_LENGTH is the size of the character array, not the string.
225 The value returned is of type `ssizetype'.
227 Unfortunately, string_constant can't access the values of const char
228 arrays with initializers, so neither can we do so here. */
235 HOST_WIDE_INT offset;
239 src = string_constant (src, &offset_node);
243 max = TREE_STRING_LENGTH (src) - 1;
244 ptr = TREE_STRING_POINTER (src);
246 if (offset_node && TREE_CODE (offset_node) != INTEGER_CST)
248 /* If the string has an internal zero byte (e.g., "foo\0bar"), we can't
249 compute the offset to the following null if we don't know where to
250 start searching for it. */
253 for (i = 0; i < max; i++)
257 /* We don't know the starting offset, but we do know that the string
258 has no internal zero bytes. We can assume that the offset falls
259 within the bounds of the string; otherwise, the programmer deserves
260 what he gets. Subtract the offset from the length of the string,
261 and return that. This would perhaps not be valid if we were dealing
262 with named arrays in addition to literal string constants. */
264 return size_diffop (size_int (max), offset_node);
267 /* We have a known offset into the string. Start searching there for
268 a null character if we can represent it as a single HOST_WIDE_INT. */
269 if (offset_node == 0)
271 else if (! host_integerp (offset_node, 0))
274 offset = tree_low_cst (offset_node, 0);
276 /* If the offset is known to be out of bounds, warn, and call strlen at
278 if (offset < 0 || offset > max)
280 warning ("offset outside bounds of constant string");
284 /* Use strlen to search for the first zero byte. Since any strings
285 constructed with build_string will have nulls appended, we win even
286 if we get handed something like (char[4])"abcd".
288 Since OFFSET is our starting index into the string, no further
289 calculation is needed. */
290 return ssize_int (strlen (ptr + offset));
293 /* Return a char pointer for a C string if it is a string constant
294 or sum of string constant and integer constant. */
302 src = string_constant (src, &offset_node);
306 if (offset_node == 0)
307 return TREE_STRING_POINTER (src);
308 else if (!host_integerp (offset_node, 1)
309 || compare_tree_int (offset_node, TREE_STRING_LENGTH (src) - 1) > 0)
312 return TREE_STRING_POINTER (src) + tree_low_cst (offset_node, 1);
315 /* Return a CONST_INT or CONST_DOUBLE corresponding to target reading
316 GET_MODE_BITSIZE (MODE) bits from string constant STR. */
319 c_readstr (str, mode)
321 enum machine_mode mode;
327 if (GET_MODE_CLASS (mode) != MODE_INT)
332 for (i = 0; i < GET_MODE_SIZE (mode); i++)
335 if (WORDS_BIG_ENDIAN)
336 j = GET_MODE_SIZE (mode) - i - 1;
337 if (BYTES_BIG_ENDIAN != WORDS_BIG_ENDIAN
338 && GET_MODE_SIZE (mode) > UNITS_PER_WORD)
339 j = j + UNITS_PER_WORD - 2 * (j % UNITS_PER_WORD) - 1;
341 if (j > 2 * HOST_BITS_PER_WIDE_INT)
344 ch = (unsigned char) str[i];
345 c[j / HOST_BITS_PER_WIDE_INT] |= ch << (j % HOST_BITS_PER_WIDE_INT);
347 return immed_double_const (c[0], c[1], mode);
350 /* Cast a target constant CST to target CHAR and if that value fits into
351 host char type, return zero and put that value into variable pointed by
355 target_char_cast (cst, p)
359 unsigned HOST_WIDE_INT val, hostval;
361 if (!host_integerp (cst, 1)
362 || CHAR_TYPE_SIZE > HOST_BITS_PER_WIDE_INT)
365 val = tree_low_cst (cst, 1);
366 if (CHAR_TYPE_SIZE < HOST_BITS_PER_WIDE_INT)
367 val &= (((unsigned HOST_WIDE_INT) 1) << CHAR_TYPE_SIZE) - 1;
370 if (HOST_BITS_PER_CHAR < HOST_BITS_PER_WIDE_INT)
371 hostval &= (((unsigned HOST_WIDE_INT) 1) << HOST_BITS_PER_CHAR) - 1;
380 /* Given TEM, a pointer to a stack frame, follow the dynamic chain COUNT
381 times to get the address of either a higher stack frame, or a return
382 address located within it (depending on FNDECL_CODE). */
385 expand_builtin_return_addr (fndecl_code, count, tem)
386 enum built_in_function fndecl_code;
392 /* Some machines need special handling before we can access
393 arbitrary frames. For example, on the sparc, we must first flush
394 all register windows to the stack. */
395 #ifdef SETUP_FRAME_ADDRESSES
397 SETUP_FRAME_ADDRESSES ();
400 /* On the sparc, the return address is not in the frame, it is in a
401 register. There is no way to access it off of the current frame
402 pointer, but it can be accessed off the previous frame pointer by
403 reading the value from the register window save area. */
404 #ifdef RETURN_ADDR_IN_PREVIOUS_FRAME
405 if (fndecl_code == BUILT_IN_RETURN_ADDRESS)
409 /* Scan back COUNT frames to the specified frame. */
410 for (i = 0; i < count; i++)
412 /* Assume the dynamic chain pointer is in the word that the
413 frame address points to, unless otherwise specified. */
414 #ifdef DYNAMIC_CHAIN_ADDRESS
415 tem = DYNAMIC_CHAIN_ADDRESS (tem);
417 tem = memory_address (Pmode, tem);
418 tem = gen_rtx_MEM (Pmode, tem);
419 set_mem_alias_set (tem, get_frame_alias_set ());
420 tem = copy_to_reg (tem);
423 /* For __builtin_frame_address, return what we've got. */
424 if (fndecl_code == BUILT_IN_FRAME_ADDRESS)
427 /* For __builtin_return_address, Get the return address from that
429 #ifdef RETURN_ADDR_RTX
430 tem = RETURN_ADDR_RTX (count, tem);
432 tem = memory_address (Pmode,
433 plus_constant (tem, GET_MODE_SIZE (Pmode)));
434 tem = gen_rtx_MEM (Pmode, tem);
435 set_mem_alias_set (tem, get_frame_alias_set ());
440 /* Alias set used for setjmp buffer. */
441 static HOST_WIDE_INT setjmp_alias_set = -1;
443 /* Construct the leading half of a __builtin_setjmp call. Control will
444 return to RECEIVER_LABEL. This is used directly by sjlj exception
448 expand_builtin_setjmp_setup (buf_addr, receiver_label)
452 enum machine_mode sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL);
456 if (setjmp_alias_set == -1)
457 setjmp_alias_set = new_alias_set ();
459 #ifdef POINTERS_EXTEND_UNSIGNED
460 if (GET_MODE (buf_addr) != Pmode)
461 buf_addr = convert_memory_address (Pmode, buf_addr);
464 buf_addr = force_reg (Pmode, force_operand (buf_addr, NULL_RTX));
468 /* We store the frame pointer and the address of receiver_label in
469 the buffer and use the rest of it for the stack save area, which
470 is machine-dependent. */
472 #ifndef BUILTIN_SETJMP_FRAME_VALUE
473 #define BUILTIN_SETJMP_FRAME_VALUE virtual_stack_vars_rtx
476 mem = gen_rtx_MEM (Pmode, buf_addr);
477 set_mem_alias_set (mem, setjmp_alias_set);
478 emit_move_insn (mem, BUILTIN_SETJMP_FRAME_VALUE);
480 mem = gen_rtx_MEM (Pmode, plus_constant (buf_addr, GET_MODE_SIZE (Pmode))),
481 set_mem_alias_set (mem, setjmp_alias_set);
483 emit_move_insn (validize_mem (mem),
484 force_reg (Pmode, gen_rtx_LABEL_REF (Pmode, receiver_label)));
486 stack_save = gen_rtx_MEM (sa_mode,
487 plus_constant (buf_addr,
488 2 * GET_MODE_SIZE (Pmode)));
489 set_mem_alias_set (stack_save, setjmp_alias_set);
490 emit_stack_save (SAVE_NONLOCAL, &stack_save, NULL_RTX);
492 /* If there is further processing to do, do it. */
493 #ifdef HAVE_builtin_setjmp_setup
494 if (HAVE_builtin_setjmp_setup)
495 emit_insn (gen_builtin_setjmp_setup (buf_addr));
498 /* Tell optimize_save_area_alloca that extra work is going to
499 need to go on during alloca. */
500 current_function_calls_setjmp = 1;
502 /* Set this so all the registers get saved in our frame; we need to be
503 able to copy the saved values for any registers from frames we unwind. */
504 current_function_has_nonlocal_label = 1;
507 /* Construct the trailing part of a __builtin_setjmp call.
508 This is used directly by sjlj exception handling code. */
511 expand_builtin_setjmp_receiver (receiver_label)
512 rtx receiver_label ATTRIBUTE_UNUSED;
514 /* Clobber the FP when we get here, so we have to make sure it's
515 marked as used by this function. */
516 emit_insn (gen_rtx_USE (VOIDmode, hard_frame_pointer_rtx));
518 /* Mark the static chain as clobbered here so life information
519 doesn't get messed up for it. */
520 emit_insn (gen_rtx_CLOBBER (VOIDmode, static_chain_rtx));
522 /* Now put in the code to restore the frame pointer, and argument
523 pointer, if needed. The code below is from expand_end_bindings
524 in stmt.c; see detailed documentation there. */
525 #ifdef HAVE_nonlocal_goto
526 if (! HAVE_nonlocal_goto)
528 emit_move_insn (virtual_stack_vars_rtx, hard_frame_pointer_rtx);
530 #if ARG_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM
531 if (fixed_regs[ARG_POINTER_REGNUM])
533 #ifdef ELIMINABLE_REGS
535 static const struct elims {const int from, to;} elim_regs[] = ELIMINABLE_REGS;
537 for (i = 0; i < ARRAY_SIZE (elim_regs); i++)
538 if (elim_regs[i].from == ARG_POINTER_REGNUM
539 && elim_regs[i].to == HARD_FRAME_POINTER_REGNUM)
542 if (i == ARRAY_SIZE (elim_regs))
545 /* Now restore our arg pointer from the address at which it
546 was saved in our stack frame. */
547 emit_move_insn (virtual_incoming_args_rtx,
548 copy_to_reg (get_arg_pointer_save_area (cfun)));
553 #ifdef HAVE_builtin_setjmp_receiver
554 if (HAVE_builtin_setjmp_receiver)
555 emit_insn (gen_builtin_setjmp_receiver (receiver_label));
558 #ifdef HAVE_nonlocal_goto_receiver
559 if (HAVE_nonlocal_goto_receiver)
560 emit_insn (gen_nonlocal_goto_receiver ());
565 /* @@@ This is a kludge. Not all machine descriptions define a blockage
566 insn, but we must not allow the code we just generated to be reordered
567 by scheduling. Specifically, the update of the frame pointer must
568 happen immediately, not later. So emit an ASM_INPUT to act as blockage
570 emit_insn (gen_rtx_ASM_INPUT (VOIDmode, ""));
573 /* __builtin_setjmp is passed a pointer to an array of five words (not
574 all will be used on all machines). It operates similarly to the C
575 library function of the same name, but is more efficient. Much of
576 the code below (and for longjmp) is copied from the handling of
579 NOTE: This is intended for use by GNAT and the exception handling
580 scheme in the compiler and will only work in the method used by
584 expand_builtin_setjmp (arglist, target)
588 rtx buf_addr, next_lab, cont_lab;
590 if (!validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
593 if (target == 0 || GET_CODE (target) != REG
594 || REGNO (target) < FIRST_PSEUDO_REGISTER)
595 target = gen_reg_rtx (TYPE_MODE (integer_type_node));
597 buf_addr = expand_expr (TREE_VALUE (arglist), NULL_RTX, VOIDmode, 0);
599 next_lab = gen_label_rtx ();
600 cont_lab = gen_label_rtx ();
602 expand_builtin_setjmp_setup (buf_addr, next_lab);
604 /* Set TARGET to zero and branch to the continue label. */
605 emit_move_insn (target, const0_rtx);
606 emit_jump_insn (gen_jump (cont_lab));
608 emit_label (next_lab);
610 expand_builtin_setjmp_receiver (next_lab);
612 /* Set TARGET to one. */
613 emit_move_insn (target, const1_rtx);
614 emit_label (cont_lab);
616 /* Tell flow about the strange goings on. Putting `next_lab' on
617 `nonlocal_goto_handler_labels' to indicates that function
618 calls may traverse the arc back to this label. */
620 current_function_has_nonlocal_label = 1;
621 nonlocal_goto_handler_labels
622 = gen_rtx_EXPR_LIST (VOIDmode, next_lab, nonlocal_goto_handler_labels);
627 /* __builtin_longjmp is passed a pointer to an array of five words (not
628 all will be used on all machines). It operates similarly to the C
629 library function of the same name, but is more efficient. Much of
630 the code below is copied from the handling of non-local gotos.
632 NOTE: This is intended for use by GNAT and the exception handling
633 scheme in the compiler and will only work in the method used by
637 expand_builtin_longjmp (buf_addr, value)
640 rtx fp, lab, stack, insn;
641 enum machine_mode sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL);
643 if (setjmp_alias_set == -1)
644 setjmp_alias_set = new_alias_set ();
646 #ifdef POINTERS_EXTEND_UNSIGNED
647 if (GET_MODE (buf_addr) != Pmode)
648 buf_addr = convert_memory_address (Pmode, buf_addr);
651 buf_addr = force_reg (Pmode, buf_addr);
653 /* We used to store value in static_chain_rtx, but that fails if pointers
654 are smaller than integers. We instead require that the user must pass
655 a second argument of 1, because that is what builtin_setjmp will
656 return. This also makes EH slightly more efficient, since we are no
657 longer copying around a value that we don't care about. */
658 if (value != const1_rtx)
661 current_function_calls_longjmp = 1;
663 #ifdef HAVE_builtin_longjmp
664 if (HAVE_builtin_longjmp)
665 emit_insn (gen_builtin_longjmp (buf_addr));
669 fp = gen_rtx_MEM (Pmode, buf_addr);
670 lab = gen_rtx_MEM (Pmode, plus_constant (buf_addr,
671 GET_MODE_SIZE (Pmode)));
673 stack = gen_rtx_MEM (sa_mode, plus_constant (buf_addr,
674 2 * GET_MODE_SIZE (Pmode)));
675 set_mem_alias_set (fp, setjmp_alias_set);
676 set_mem_alias_set (lab, setjmp_alias_set);
677 set_mem_alias_set (stack, setjmp_alias_set);
679 /* Pick up FP, label, and SP from the block and jump. This code is
680 from expand_goto in stmt.c; see there for detailed comments. */
681 #if HAVE_nonlocal_goto
682 if (HAVE_nonlocal_goto)
683 /* We have to pass a value to the nonlocal_goto pattern that will
684 get copied into the static_chain pointer, but it does not matter
685 what that value is, because builtin_setjmp does not use it. */
686 emit_insn (gen_nonlocal_goto (value, lab, stack, fp));
690 lab = copy_to_reg (lab);
692 emit_move_insn (hard_frame_pointer_rtx, fp);
693 emit_stack_restore (SAVE_NONLOCAL, stack, NULL_RTX);
695 emit_insn (gen_rtx_USE (VOIDmode, hard_frame_pointer_rtx));
696 emit_insn (gen_rtx_USE (VOIDmode, stack_pointer_rtx));
697 emit_indirect_jump (lab);
701 /* Search backwards and mark the jump insn as a non-local goto.
702 Note that this precludes the use of __builtin_longjmp to a
703 __builtin_setjmp target in the same function. However, we've
704 already cautioned the user that these functions are for
705 internal exception handling use only. */
706 for (insn = get_last_insn (); insn; insn = PREV_INSN (insn))
708 if (GET_CODE (insn) == JUMP_INSN)
710 REG_NOTES (insn) = alloc_EXPR_LIST (REG_NON_LOCAL_GOTO, const0_rtx,
714 else if (GET_CODE (insn) == CALL_INSN)
719 /* Expand a call to __builtin_prefetch. For a target that does not support
720 data prefetch, evaluate the memory address argument in case it has side
724 expand_builtin_prefetch (arglist)
727 tree arg0, arg1, arg2;
730 arg0 = TREE_VALUE (arglist);
731 arg1 = TREE_VALUE (TREE_CHAIN (arglist));
732 arg2 = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
734 /* Argument 0 is an address. */
735 op0 = expand_expr (arg0, NULL_RTX, Pmode, EXPAND_NORMAL);
737 /* Argument 1 (read/write flag) must be a compile-time constant int. */
738 if (TREE_CODE (arg1) != INTEGER_CST)
740 error ("second arg to `__builtin_prefetch' must be a constant");
741 arg1 = integer_zero_node;
743 op1 = expand_expr (arg1, NULL_RTX, VOIDmode, 0);
744 /* Argument 1 must be either zero or one. */
745 if (INTVAL (op1) != 0 && INTVAL (op1) != 1)
747 warning ("invalid second arg to __builtin_prefetch; using zero");
751 /* Argument 2 (locality) must be a compile-time constant int. */
752 if (TREE_CODE (arg2) != INTEGER_CST)
754 error ("third arg to `__builtin_prefetch' must be a constant");
755 arg2 = integer_zero_node;
757 op2 = expand_expr (arg2, NULL_RTX, VOIDmode, 0);
758 /* Argument 2 must be 0, 1, 2, or 3. */
759 if (INTVAL (op2) < 0 || INTVAL (op2) > 3)
761 warning ("invalid third arg to __builtin_prefetch; using zero");
768 if (! (*insn_data[(int)CODE_FOR_prefetch].operand[0].predicate)
770 op0 = force_reg (Pmode, op0);
771 emit_insn (gen_prefetch (op0, op1, op2));
775 op0 = protect_from_queue (op0, 0);
776 /* Don't do anything with direct references to volatile memory, but
777 generate code to handle other side effects. */
778 if (GET_CODE (op0) != MEM && side_effects_p (op0))
782 /* Get a MEM rtx for expression EXP which is the address of an operand
783 to be used to be used in a string instruction (cmpstrsi, movstrsi, ..). */
789 rtx addr = expand_expr (exp, NULL_RTX, ptr_mode, EXPAND_SUM);
792 #ifdef POINTERS_EXTEND_UNSIGNED
793 if (GET_MODE (addr) != Pmode)
794 addr = convert_memory_address (Pmode, addr);
797 mem = gen_rtx_MEM (BLKmode, memory_address (BLKmode, addr));
799 /* Get an expression we can use to find the attributes to assign to MEM.
800 If it is an ADDR_EXPR, use the operand. Otherwise, dereference it if
801 we can. First remove any nops. */
802 while ((TREE_CODE (exp) == NOP_EXPR || TREE_CODE (exp) == CONVERT_EXPR
803 || TREE_CODE (exp) == NON_LVALUE_EXPR)
804 && POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (exp, 0))))
805 exp = TREE_OPERAND (exp, 0);
807 if (TREE_CODE (exp) == ADDR_EXPR)
809 exp = TREE_OPERAND (exp, 0);
810 set_mem_attributes (mem, exp, 0);
812 else if (POINTER_TYPE_P (TREE_TYPE (exp)))
814 exp = build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (exp)), exp);
815 /* memcpy, memset and other builtin stringops can alias with anything. */
816 set_mem_alias_set (mem, 0);
822 /* Built-in functions to perform an untyped call and return. */
824 /* For each register that may be used for calling a function, this
825 gives a mode used to copy the register's value. VOIDmode indicates
826 the register is not used for calling a function. If the machine
827 has register windows, this gives only the outbound registers.
828 INCOMING_REGNO gives the corresponding inbound register. */
829 static enum machine_mode apply_args_mode[FIRST_PSEUDO_REGISTER];
831 /* For each register that may be used for returning values, this gives
832 a mode used to copy the register's value. VOIDmode indicates the
833 register is not used for returning values. If the machine has
834 register windows, this gives only the outbound registers.
835 INCOMING_REGNO gives the corresponding inbound register. */
836 static enum machine_mode apply_result_mode[FIRST_PSEUDO_REGISTER];
838 /* For each register that may be used for calling a function, this
839 gives the offset of that register into the block returned by
840 __builtin_apply_args. 0 indicates that the register is not
841 used for calling a function. */
842 static int apply_args_reg_offset[FIRST_PSEUDO_REGISTER];
844 /* Return the offset of register REGNO into the block returned by
845 __builtin_apply_args. This is not declared static, since it is
846 needed in objc-act.c. */
849 apply_args_register_offset (regno)
854 /* Arguments are always put in outgoing registers (in the argument
855 block) if such make sense. */
856 #ifdef OUTGOING_REGNO
857 regno = OUTGOING_REGNO(regno);
859 return apply_args_reg_offset[regno];
862 /* Return the size required for the block returned by __builtin_apply_args,
863 and initialize apply_args_mode. */
868 static int size = -1;
870 enum machine_mode mode;
872 /* The values computed by this function never change. */
875 /* The first value is the incoming arg-pointer. */
876 size = GET_MODE_SIZE (Pmode);
878 /* The second value is the structure value address unless this is
879 passed as an "invisible" first argument. */
880 if (struct_value_rtx)
881 size += GET_MODE_SIZE (Pmode);
883 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
884 if (FUNCTION_ARG_REGNO_P (regno))
886 /* Search for the proper mode for copying this register's
887 value. I'm not sure this is right, but it works so far. */
888 enum machine_mode best_mode = VOIDmode;
890 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
892 mode = GET_MODE_WIDER_MODE (mode))
893 if (HARD_REGNO_MODE_OK (regno, mode)
894 && HARD_REGNO_NREGS (regno, mode) == 1)
897 if (best_mode == VOIDmode)
898 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
900 mode = GET_MODE_WIDER_MODE (mode))
901 if (HARD_REGNO_MODE_OK (regno, mode)
902 && have_insn_for (SET, mode))
905 if (best_mode == VOIDmode)
906 for (mode = GET_CLASS_NARROWEST_MODE (MODE_VECTOR_FLOAT);
908 mode = GET_MODE_WIDER_MODE (mode))
909 if (HARD_REGNO_MODE_OK (regno, mode)
910 && have_insn_for (SET, mode))
913 if (best_mode == VOIDmode)
914 for (mode = GET_CLASS_NARROWEST_MODE (MODE_VECTOR_INT);
916 mode = GET_MODE_WIDER_MODE (mode))
917 if (HARD_REGNO_MODE_OK (regno, mode)
918 && have_insn_for (SET, mode))
922 if (mode == VOIDmode)
925 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
926 if (size % align != 0)
927 size = CEIL (size, align) * align;
928 apply_args_reg_offset[regno] = size;
929 size += GET_MODE_SIZE (mode);
930 apply_args_mode[regno] = mode;
934 apply_args_mode[regno] = VOIDmode;
935 apply_args_reg_offset[regno] = 0;
941 /* Return the size required for the block returned by __builtin_apply,
942 and initialize apply_result_mode. */
947 static int size = -1;
949 enum machine_mode mode;
951 /* The values computed by this function never change. */
956 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
957 if (FUNCTION_VALUE_REGNO_P (regno))
959 /* Search for the proper mode for copying this register's
960 value. I'm not sure this is right, but it works so far. */
961 enum machine_mode best_mode = VOIDmode;
963 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
965 mode = GET_MODE_WIDER_MODE (mode))
966 if (HARD_REGNO_MODE_OK (regno, mode))
969 if (best_mode == VOIDmode)
970 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
972 mode = GET_MODE_WIDER_MODE (mode))
973 if (HARD_REGNO_MODE_OK (regno, mode)
974 && have_insn_for (SET, mode))
977 if (best_mode == VOIDmode)
978 for (mode = GET_CLASS_NARROWEST_MODE (MODE_VECTOR_FLOAT);
980 mode = GET_MODE_WIDER_MODE (mode))
981 if (HARD_REGNO_MODE_OK (regno, mode)
982 && have_insn_for (SET, mode))
985 if (best_mode == VOIDmode)
986 for (mode = GET_CLASS_NARROWEST_MODE (MODE_VECTOR_INT);
988 mode = GET_MODE_WIDER_MODE (mode))
989 if (HARD_REGNO_MODE_OK (regno, mode)
990 && have_insn_for (SET, mode))
994 if (mode == VOIDmode)
997 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
998 if (size % align != 0)
999 size = CEIL (size, align) * align;
1000 size += GET_MODE_SIZE (mode);
1001 apply_result_mode[regno] = mode;
1004 apply_result_mode[regno] = VOIDmode;
1006 /* Allow targets that use untyped_call and untyped_return to override
1007 the size so that machine-specific information can be stored here. */
1008 #ifdef APPLY_RESULT_SIZE
1009 size = APPLY_RESULT_SIZE;
1015 #if defined (HAVE_untyped_call) || defined (HAVE_untyped_return)
1016 /* Create a vector describing the result block RESULT. If SAVEP is true,
1017 the result block is used to save the values; otherwise it is used to
1018 restore the values. */
1021 result_vector (savep, result)
1025 int regno, size, align, nelts;
1026 enum machine_mode mode;
1028 rtx *savevec = (rtx *) alloca (FIRST_PSEUDO_REGISTER * sizeof (rtx));
1031 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1032 if ((mode = apply_result_mode[regno]) != VOIDmode)
1034 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
1035 if (size % align != 0)
1036 size = CEIL (size, align) * align;
1037 reg = gen_rtx_REG (mode, savep ? regno : INCOMING_REGNO (regno));
1038 mem = adjust_address (result, mode, size);
1039 savevec[nelts++] = (savep
1040 ? gen_rtx_SET (VOIDmode, mem, reg)
1041 : gen_rtx_SET (VOIDmode, reg, mem));
1042 size += GET_MODE_SIZE (mode);
1044 return gen_rtx_PARALLEL (VOIDmode, gen_rtvec_v (nelts, savevec));
1046 #endif /* HAVE_untyped_call or HAVE_untyped_return */
1048 /* Save the state required to perform an untyped call with the same
1049 arguments as were passed to the current function. */
1052 expand_builtin_apply_args_1 ()
1055 int size, align, regno;
1056 enum machine_mode mode;
1058 /* Create a block where the arg-pointer, structure value address,
1059 and argument registers can be saved. */
1060 registers = assign_stack_local (BLKmode, apply_args_size (), -1);
1062 /* Walk past the arg-pointer and structure value address. */
1063 size = GET_MODE_SIZE (Pmode);
1064 if (struct_value_rtx)
1065 size += GET_MODE_SIZE (Pmode);
1067 /* Save each register used in calling a function to the block. */
1068 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1069 if ((mode = apply_args_mode[regno]) != VOIDmode)
1073 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
1074 if (size % align != 0)
1075 size = CEIL (size, align) * align;
1077 tem = gen_rtx_REG (mode, INCOMING_REGNO (regno));
1079 emit_move_insn (adjust_address (registers, mode, size), tem);
1080 size += GET_MODE_SIZE (mode);
1083 /* Save the arg pointer to the block. */
1084 emit_move_insn (adjust_address (registers, Pmode, 0),
1085 copy_to_reg (virtual_incoming_args_rtx));
1086 size = GET_MODE_SIZE (Pmode);
1088 /* Save the structure value address unless this is passed as an
1089 "invisible" first argument. */
1090 if (struct_value_incoming_rtx)
1092 emit_move_insn (adjust_address (registers, Pmode, size),
1093 copy_to_reg (struct_value_incoming_rtx));
1094 size += GET_MODE_SIZE (Pmode);
1097 /* Return the address of the block. */
1098 return copy_addr_to_reg (XEXP (registers, 0));
1101 /* __builtin_apply_args returns block of memory allocated on
1102 the stack into which is stored the arg pointer, structure
1103 value address, static chain, and all the registers that might
1104 possibly be used in performing a function call. The code is
1105 moved to the start of the function so the incoming values are
1109 expand_builtin_apply_args ()
1111 /* Don't do __builtin_apply_args more than once in a function.
1112 Save the result of the first call and reuse it. */
1113 if (apply_args_value != 0)
1114 return apply_args_value;
1116 /* When this function is called, it means that registers must be
1117 saved on entry to this function. So we migrate the
1118 call to the first insn of this function. */
1123 temp = expand_builtin_apply_args_1 ();
1127 apply_args_value = temp;
1129 /* Put the sequence after the NOTE that starts the function.
1130 If this is inside a SEQUENCE, make the outer-level insn
1131 chain current, so the code is placed at the start of the
1133 push_topmost_sequence ();
1134 emit_insns_before (seq, NEXT_INSN (get_insns ()));
1135 pop_topmost_sequence ();
1140 /* Perform an untyped call and save the state required to perform an
1141 untyped return of whatever value was returned by the given function. */
1144 expand_builtin_apply (function, arguments, argsize)
1145 rtx function, arguments, argsize;
1147 int size, align, regno;
1148 enum machine_mode mode;
1149 rtx incoming_args, result, reg, dest, src, call_insn;
1150 rtx old_stack_level = 0;
1151 rtx call_fusage = 0;
1153 #ifdef POINTERS_EXTEND_UNSIGNED
1154 if (GET_MODE (arguments) != Pmode)
1155 arguments = convert_memory_address (Pmode, arguments);
1158 /* Create a block where the return registers can be saved. */
1159 result = assign_stack_local (BLKmode, apply_result_size (), -1);
1161 /* Fetch the arg pointer from the ARGUMENTS block. */
1162 incoming_args = gen_reg_rtx (Pmode);
1163 emit_move_insn (incoming_args, gen_rtx_MEM (Pmode, arguments));
1164 #ifndef STACK_GROWS_DOWNWARD
1165 incoming_args = expand_simple_binop (Pmode, MINUS, incoming_args, argsize,
1166 incoming_args, 0, OPTAB_LIB_WIDEN);
1169 /* Perform postincrements before actually calling the function. */
1172 /* Push a new argument block and copy the arguments. Do not allow
1173 the (potential) memcpy call below to interfere with our stack
1175 do_pending_stack_adjust ();
1178 /* Save the stack with nonlocal if available */
1179 #ifdef HAVE_save_stack_nonlocal
1180 if (HAVE_save_stack_nonlocal)
1181 emit_stack_save (SAVE_NONLOCAL, &old_stack_level, NULL_RTX);
1184 emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX);
1186 /* Push a block of memory onto the stack to store the memory arguments.
1187 Save the address in a register, and copy the memory arguments. ??? I
1188 haven't figured out how the calling convention macros effect this,
1189 but it's likely that the source and/or destination addresses in
1190 the block copy will need updating in machine specific ways. */
1191 dest = allocate_dynamic_stack_space (argsize, 0, BITS_PER_UNIT);
1192 dest = gen_rtx_MEM (BLKmode, dest);
1193 set_mem_align (dest, PARM_BOUNDARY);
1194 src = gen_rtx_MEM (BLKmode, incoming_args);
1195 set_mem_align (src, PARM_BOUNDARY);
1196 emit_block_move (dest, src, argsize);
1198 /* Refer to the argument block. */
1200 arguments = gen_rtx_MEM (BLKmode, arguments);
1201 set_mem_align (arguments, PARM_BOUNDARY);
1203 /* Walk past the arg-pointer and structure value address. */
1204 size = GET_MODE_SIZE (Pmode);
1205 if (struct_value_rtx)
1206 size += GET_MODE_SIZE (Pmode);
1208 /* Restore each of the registers previously saved. Make USE insns
1209 for each of these registers for use in making the call. */
1210 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1211 if ((mode = apply_args_mode[regno]) != VOIDmode)
1213 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
1214 if (size % align != 0)
1215 size = CEIL (size, align) * align;
1216 reg = gen_rtx_REG (mode, regno);
1217 emit_move_insn (reg, adjust_address (arguments, mode, size));
1218 use_reg (&call_fusage, reg);
1219 size += GET_MODE_SIZE (mode);
1222 /* Restore the structure value address unless this is passed as an
1223 "invisible" first argument. */
1224 size = GET_MODE_SIZE (Pmode);
1225 if (struct_value_rtx)
1227 rtx value = gen_reg_rtx (Pmode);
1228 emit_move_insn (value, adjust_address (arguments, Pmode, size));
1229 emit_move_insn (struct_value_rtx, value);
1230 if (GET_CODE (struct_value_rtx) == REG)
1231 use_reg (&call_fusage, struct_value_rtx);
1232 size += GET_MODE_SIZE (Pmode);
1235 /* All arguments and registers used for the call are set up by now! */
1236 function = prepare_call_address (function, NULL_TREE, &call_fusage, 0, 0);
1238 /* Ensure address is valid. SYMBOL_REF is already valid, so no need,
1239 and we don't want to load it into a register as an optimization,
1240 because prepare_call_address already did it if it should be done. */
1241 if (GET_CODE (function) != SYMBOL_REF)
1242 function = memory_address (FUNCTION_MODE, function);
1244 /* Generate the actual call instruction and save the return value. */
1245 #ifdef HAVE_untyped_call
1246 if (HAVE_untyped_call)
1247 emit_call_insn (gen_untyped_call (gen_rtx_MEM (FUNCTION_MODE, function),
1248 result, result_vector (1, result)));
1251 #ifdef HAVE_call_value
1252 if (HAVE_call_value)
1256 /* Locate the unique return register. It is not possible to
1257 express a call that sets more than one return register using
1258 call_value; use untyped_call for that. In fact, untyped_call
1259 only needs to save the return registers in the given block. */
1260 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1261 if ((mode = apply_result_mode[regno]) != VOIDmode)
1264 abort (); /* HAVE_untyped_call required. */
1265 valreg = gen_rtx_REG (mode, regno);
1268 emit_call_insn (GEN_CALL_VALUE (valreg,
1269 gen_rtx_MEM (FUNCTION_MODE, function),
1270 const0_rtx, NULL_RTX, const0_rtx));
1272 emit_move_insn (adjust_address (result, GET_MODE (valreg), 0), valreg);
1278 /* Find the CALL insn we just emitted. */
1279 for (call_insn = get_last_insn ();
1280 call_insn && GET_CODE (call_insn) != CALL_INSN;
1281 call_insn = PREV_INSN (call_insn))
1287 /* Put the register usage information on the CALL. If there is already
1288 some usage information, put ours at the end. */
1289 if (CALL_INSN_FUNCTION_USAGE (call_insn))
1293 for (link = CALL_INSN_FUNCTION_USAGE (call_insn); XEXP (link, 1) != 0;
1294 link = XEXP (link, 1))
1297 XEXP (link, 1) = call_fusage;
1300 CALL_INSN_FUNCTION_USAGE (call_insn) = call_fusage;
1302 /* Restore the stack. */
1303 #ifdef HAVE_save_stack_nonlocal
1304 if (HAVE_save_stack_nonlocal)
1305 emit_stack_restore (SAVE_NONLOCAL, old_stack_level, NULL_RTX);
1308 emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX);
1312 /* Return the address of the result block. */
1313 return copy_addr_to_reg (XEXP (result, 0));
1316 /* Perform an untyped return. */
1319 expand_builtin_return (result)
1322 int size, align, regno;
1323 enum machine_mode mode;
1325 rtx call_fusage = 0;
1327 #ifdef POINTERS_EXTEND_UNSIGNED
1328 if (GET_MODE (result) != Pmode)
1329 result = convert_memory_address (Pmode, result);
1332 apply_result_size ();
1333 result = gen_rtx_MEM (BLKmode, result);
1335 #ifdef HAVE_untyped_return
1336 if (HAVE_untyped_return)
1338 emit_jump_insn (gen_untyped_return (result, result_vector (0, result)));
1344 /* Restore the return value and note that each value is used. */
1346 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1347 if ((mode = apply_result_mode[regno]) != VOIDmode)
1349 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
1350 if (size % align != 0)
1351 size = CEIL (size, align) * align;
1352 reg = gen_rtx_REG (mode, INCOMING_REGNO (regno));
1353 emit_move_insn (reg, adjust_address (result, mode, size));
1355 push_to_sequence (call_fusage);
1356 emit_insn (gen_rtx_USE (VOIDmode, reg));
1357 call_fusage = get_insns ();
1359 size += GET_MODE_SIZE (mode);
1362 /* Put the USE insns before the return. */
1363 emit_insns (call_fusage);
1365 /* Return whatever values was restored by jumping directly to the end
1367 expand_null_return ();
1370 /* Used by expand_builtin_classify_type and fold_builtin_classify_type. */
1372 static enum type_class
1373 type_to_class (type)
1376 switch (TREE_CODE (type))
1378 case VOID_TYPE: return void_type_class;
1379 case INTEGER_TYPE: return integer_type_class;
1380 case CHAR_TYPE: return char_type_class;
1381 case ENUMERAL_TYPE: return enumeral_type_class;
1382 case BOOLEAN_TYPE: return boolean_type_class;
1383 case POINTER_TYPE: return pointer_type_class;
1384 case REFERENCE_TYPE: return reference_type_class;
1385 case OFFSET_TYPE: return offset_type_class;
1386 case REAL_TYPE: return real_type_class;
1387 case COMPLEX_TYPE: return complex_type_class;
1388 case FUNCTION_TYPE: return function_type_class;
1389 case METHOD_TYPE: return method_type_class;
1390 case RECORD_TYPE: return record_type_class;
1392 case QUAL_UNION_TYPE: return union_type_class;
1393 case ARRAY_TYPE: return (TYPE_STRING_FLAG (type)
1394 ? string_type_class : array_type_class);
1395 case SET_TYPE: return set_type_class;
1396 case FILE_TYPE: return file_type_class;
1397 case LANG_TYPE: return lang_type_class;
1398 default: return no_type_class;
1402 /* Expand a call to __builtin_classify_type with arguments found in
1406 expand_builtin_classify_type (arglist)
1410 return GEN_INT (type_to_class (TREE_TYPE (TREE_VALUE (arglist))));
1411 return GEN_INT (no_type_class);
1414 /* Expand expression EXP, which is a call to __builtin_constant_p. */
1417 expand_builtin_constant_p (exp)
1420 tree arglist = TREE_OPERAND (exp, 1);
1421 enum machine_mode value_mode = TYPE_MODE (TREE_TYPE (exp));
1426 arglist = TREE_VALUE (arglist);
1428 /* We have taken care of the easy cases during constant folding. This
1429 case is not obvious, so emit (constant_p_rtx (ARGLIST)) and let CSE get a
1430 chance to see if it can deduce whether ARGLIST is constant. */
1432 tmp = expand_expr (arglist, NULL_RTX, VOIDmode, 0);
1433 tmp = gen_rtx_CONSTANT_P_RTX (value_mode, tmp);
1437 /* Expand a call to one of the builtin math functions (sin, cos, or sqrt).
1438 Return 0 if a normal call should be emitted rather than expanding the
1439 function in-line. EXP is the expression that is a call to the builtin
1440 function; if convenient, the result should be placed in TARGET.
1441 SUBTARGET may be used as the target for computing one of EXP's operands. */
1444 expand_builtin_mathfn (exp, target, subtarget)
1446 rtx target, subtarget;
1448 optab builtin_optab;
1450 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
1451 tree arglist = TREE_OPERAND (exp, 1);
1453 if (!validate_arglist (arglist, REAL_TYPE, VOID_TYPE))
1456 /* Stabilize and compute the argument. */
1457 if (TREE_CODE (TREE_VALUE (arglist)) != VAR_DECL
1458 && TREE_CODE (TREE_VALUE (arglist)) != PARM_DECL)
1460 exp = copy_node (exp);
1461 TREE_OPERAND (exp, 1) = arglist;
1462 /* Wrap the computation of the argument in a SAVE_EXPR. That
1463 way, if we need to expand the argument again (as in the
1464 flag_errno_math case below where we cannot directly set
1465 errno), we will not perform side-effects more than once.
1466 Note that here we're mutating the original EXP as well as the
1467 copy; that's the right thing to do in case the original EXP
1468 is expanded later. */
1469 TREE_VALUE (arglist) = save_expr (TREE_VALUE (arglist));
1470 arglist = copy_node (arglist);
1472 op0 = expand_expr (TREE_VALUE (arglist), subtarget, VOIDmode, 0);
1474 /* Make a suitable register to place result in. */
1475 target = gen_reg_rtx (TYPE_MODE (TREE_TYPE (exp)));
1480 switch (DECL_FUNCTION_CODE (fndecl))
1485 builtin_optab = sin_optab; break;
1489 builtin_optab = cos_optab; break;
1490 case BUILT_IN_FSQRT:
1491 case BUILT_IN_SQRTF:
1492 case BUILT_IN_SQRTL:
1493 builtin_optab = sqrt_optab; break;
1498 /* Compute into TARGET.
1499 Set TARGET to wherever the result comes back. */
1500 target = expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist))),
1501 builtin_optab, op0, target, 0);
1503 /* If we were unable to expand via the builtin, stop the
1504 sequence (without outputting the insns) and return 0, causing
1505 a call to the library function. */
1512 /* If errno must be maintained and if we are not allowing unsafe
1513 math optimizations, check the result. */
1515 if (flag_errno_math && ! flag_unsafe_math_optimizations)
1519 /* Don't define the builtin FP instructions
1520 if your machine is not IEEE. */
1521 if (TARGET_FLOAT_FORMAT != IEEE_FLOAT_FORMAT)
1524 lab1 = gen_label_rtx ();
1526 /* Test the result; if it is NaN, set errno=EDOM because
1527 the argument was not in the domain. */
1528 emit_cmp_and_jump_insns (target, target, EQ, 0, GET_MODE (target),
1533 #ifdef GEN_ERRNO_RTX
1534 rtx errno_rtx = GEN_ERRNO_RTX;
1537 = gen_rtx_MEM (word_mode, gen_rtx_SYMBOL_REF (Pmode, "errno"));
1540 emit_move_insn (errno_rtx, GEN_INT (TARGET_EDOM));
1543 /* We can't set errno=EDOM directly; let the library call do it.
1544 Pop the arguments right away in case the call gets deleted. */
1546 expand_call (exp, target, 0);
1553 /* Output the entire sequence. */
1554 insns = get_insns ();
1561 /* Expand expression EXP which is a call to the strlen builtin. Return 0
1562 if we failed the caller should emit a normal call, otherwise
1563 try to get the result in TARGET, if convenient. */
1566 expand_builtin_strlen (exp, target)
1570 tree arglist = TREE_OPERAND (exp, 1);
1571 enum machine_mode value_mode = TYPE_MODE (TREE_TYPE (exp));
1573 if (!validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
1578 tree src = TREE_VALUE (arglist);
1581 = get_pointer_alignment (src, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
1583 rtx result, src_reg, char_rtx, before_strlen;
1584 enum machine_mode insn_mode = value_mode, char_mode;
1585 enum insn_code icode = CODE_FOR_nothing;
1587 /* If SRC is not a pointer type, don't do this operation inline. */
1591 /* Bail out if we can't compute strlen in the right mode. */
1592 while (insn_mode != VOIDmode)
1594 icode = strlen_optab->handlers[(int) insn_mode].insn_code;
1595 if (icode != CODE_FOR_nothing)
1598 insn_mode = GET_MODE_WIDER_MODE (insn_mode);
1600 if (insn_mode == VOIDmode)
1603 /* Make a place to write the result of the instruction. */
1606 && GET_CODE (result) == REG
1607 && GET_MODE (result) == insn_mode
1608 && REGNO (result) >= FIRST_PSEUDO_REGISTER))
1609 result = gen_reg_rtx (insn_mode);
1611 /* Make a place to hold the source address. We will not expand
1612 the actual source until we are sure that the expansion will
1613 not fail -- there are trees that cannot be expanded twice. */
1614 src_reg = gen_reg_rtx (Pmode);
1616 /* Mark the beginning of the strlen sequence so we can emit the
1617 source operand later. */
1618 before_strlen = get_last_insn();
1620 /* Check the string is readable and has an end. */
1621 if (current_function_check_memory_usage)
1622 emit_library_call (chkr_check_str_libfunc, LCT_CONST_MAKE_BLOCK,
1623 VOIDmode, 2, src_reg, Pmode,
1624 GEN_INT (MEMORY_USE_RO),
1625 TYPE_MODE (integer_type_node));
1627 char_rtx = const0_rtx;
1628 char_mode = insn_data[(int) icode].operand[2].mode;
1629 if (! (*insn_data[(int) icode].operand[2].predicate) (char_rtx,
1631 char_rtx = copy_to_mode_reg (char_mode, char_rtx);
1633 pat = GEN_FCN (icode) (result, gen_rtx_MEM (BLKmode, src_reg),
1634 char_rtx, GEN_INT (align));
1639 /* Now that we are assured of success, expand the source. */
1641 pat = memory_address (BLKmode,
1642 expand_expr (src, src_reg, ptr_mode, EXPAND_SUM));
1644 emit_move_insn (src_reg, pat);
1645 pat = gen_sequence ();
1649 emit_insn_after (pat, before_strlen);
1651 emit_insn_before (pat, get_insns ());
1653 /* Return the value in the proper mode for this function. */
1654 if (GET_MODE (result) == value_mode)
1656 else if (target != 0)
1657 convert_move (target, result, 0);
1659 target = convert_to_mode (value_mode, result, 0);
1665 /* Expand a call to the strstr builtin. Return 0 if we failed the
1666 caller should emit a normal call, otherwise try to get the result
1667 in TARGET, if convenient (and in mode MODE if that's convenient). */
1670 expand_builtin_strstr (arglist, target, mode)
1673 enum machine_mode mode;
1675 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE)
1676 || current_function_check_memory_usage)
1680 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1682 const char *p1, *p2;
1691 const char *r = strstr (p1, p2);
1696 /* Return an offset into the constant string argument. */
1697 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1698 s1, ssize_int (r - p1))),
1699 target, mode, EXPAND_NORMAL);
1703 return expand_expr (s1, target, mode, EXPAND_NORMAL);
1708 fn = built_in_decls[BUILT_IN_STRCHR];
1712 /* New argument list transforming strstr(s1, s2) to
1713 strchr(s1, s2[0]). */
1715 build_tree_list (NULL_TREE, build_int_2 (p2[0], 0));
1716 arglist = tree_cons (NULL_TREE, s1, arglist);
1717 return expand_expr (build_function_call_expr (fn, arglist),
1718 target, mode, EXPAND_NORMAL);
1722 /* Expand a call to the strchr builtin. Return 0 if we failed the
1723 caller should emit a normal call, otherwise try to get the result
1724 in TARGET, if convenient (and in mode MODE if that's convenient). */
1727 expand_builtin_strchr (arglist, target, mode)
1730 enum machine_mode mode;
1732 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE)
1733 || current_function_check_memory_usage)
1737 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1740 if (TREE_CODE (s2) != INTEGER_CST)
1749 if (target_char_cast (s2, &c))
1757 /* Return an offset into the constant string argument. */
1758 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1759 s1, ssize_int (r - p1))),
1760 target, mode, EXPAND_NORMAL);
1763 /* FIXME: Should use here strchrM optab so that ports can optimize
1769 /* Expand a call to the strrchr builtin. Return 0 if we failed the
1770 caller should emit a normal call, otherwise try to get the result
1771 in TARGET, if convenient (and in mode MODE if that's convenient). */
1774 expand_builtin_strrchr (arglist, target, mode)
1777 enum machine_mode mode;
1779 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE)
1780 || current_function_check_memory_usage)
1784 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1788 if (TREE_CODE (s2) != INTEGER_CST)
1797 if (target_char_cast (s2, &c))
1800 r = strrchr (p1, c);
1805 /* Return an offset into the constant string argument. */
1806 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1807 s1, ssize_int (r - p1))),
1808 target, mode, EXPAND_NORMAL);
1811 if (! integer_zerop (s2))
1814 fn = built_in_decls[BUILT_IN_STRCHR];
1818 /* Transform strrchr(s1, '\0') to strchr(s1, '\0'). */
1819 return expand_expr (build_function_call_expr (fn, arglist),
1820 target, mode, EXPAND_NORMAL);
1824 /* Expand a call to the strpbrk builtin. Return 0 if we failed the
1825 caller should emit a normal call, otherwise try to get the result
1826 in TARGET, if convenient (and in mode MODE if that's convenient). */
1829 expand_builtin_strpbrk (arglist, target, mode)
1832 enum machine_mode mode;
1834 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE)
1835 || current_function_check_memory_usage)
1839 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1841 const char *p1, *p2;
1850 const char *r = strpbrk (p1, p2);
1855 /* Return an offset into the constant string argument. */
1856 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1857 s1, ssize_int (r - p1))),
1858 target, mode, EXPAND_NORMAL);
1863 /* strpbrk(x, "") == NULL.
1864 Evaluate and ignore the arguments in case they had
1866 expand_expr (s1, const0_rtx, VOIDmode, EXPAND_NORMAL);
1871 return 0; /* Really call strpbrk. */
1873 fn = built_in_decls[BUILT_IN_STRCHR];
1877 /* New argument list transforming strpbrk(s1, s2) to
1878 strchr(s1, s2[0]). */
1880 build_tree_list (NULL_TREE, build_int_2 (p2[0], 0));
1881 arglist = tree_cons (NULL_TREE, s1, arglist);
1882 return expand_expr (build_function_call_expr (fn, arglist),
1883 target, mode, EXPAND_NORMAL);
1887 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
1888 bytes from constant string DATA + OFFSET and return it as target
1892 builtin_memcpy_read_str (data, offset, mode)
1894 HOST_WIDE_INT offset;
1895 enum machine_mode mode;
1897 const char *str = (const char *) data;
1900 || ((unsigned HOST_WIDE_INT) offset + GET_MODE_SIZE (mode)
1901 > strlen (str) + 1))
1902 abort (); /* Attempt to read past the end of constant string. */
1904 return c_readstr (str + offset, mode);
1907 /* Expand a call to the memcpy builtin, with arguments in ARGLIST. */
1910 expand_builtin_memcpy (arglist)
1913 if (!validate_arglist (arglist,
1914 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
1918 tree dest = TREE_VALUE (arglist);
1919 tree src = TREE_VALUE (TREE_CHAIN (arglist));
1920 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
1921 const char *src_str;
1923 unsigned int src_align = get_pointer_alignment (src, BIGGEST_ALIGNMENT);
1924 unsigned int dest_align
1925 = get_pointer_alignment (dest, BIGGEST_ALIGNMENT);
1926 rtx dest_mem, src_mem, dest_addr, len_rtx;
1928 /* If either SRC or DEST is not a pointer type, don't do
1929 this operation in-line. */
1930 if (src_align == 0 || dest_align == 0)
1933 dest_mem = get_memory_rtx (dest);
1934 set_mem_align (dest_mem, dest_align);
1935 len_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
1936 src_str = c_getstr (src);
1938 /* If SRC is a string constant and block move would be done
1939 by pieces, we can avoid loading the string from memory
1940 and only stored the computed constants. */
1942 && !current_function_check_memory_usage
1943 && GET_CODE (len_rtx) == CONST_INT
1944 && (unsigned HOST_WIDE_INT) INTVAL (len_rtx) <= strlen (src_str) + 1
1945 && can_store_by_pieces (INTVAL (len_rtx), builtin_memcpy_read_str,
1946 (PTR) src_str, dest_align))
1948 store_by_pieces (dest_mem, INTVAL (len_rtx),
1949 builtin_memcpy_read_str,
1950 (PTR) src_str, dest_align);
1951 return force_operand (XEXP (dest_mem, 0), NULL_RTX);
1954 src_mem = get_memory_rtx (src);
1955 set_mem_align (src_mem, src_align);
1957 /* Just copy the rights of SRC to the rights of DEST. */
1958 if (current_function_check_memory_usage)
1959 emit_library_call (chkr_copy_bitmap_libfunc, LCT_CONST_MAKE_BLOCK,
1960 VOIDmode, 3, XEXP (dest_mem, 0), Pmode,
1961 XEXP (src_mem, 0), Pmode,
1962 len_rtx, TYPE_MODE (sizetype));
1964 /* Copy word part most expediently. */
1965 dest_addr = emit_block_move (dest_mem, src_mem, len_rtx);
1968 dest_addr = force_operand (XEXP (dest_mem, 0), NULL_RTX);
1974 /* Expand expression EXP, which is a call to the strcpy builtin. Return 0
1975 if we failed the caller should emit a normal call. */
1978 expand_builtin_strcpy (exp)
1981 tree arglist = TREE_OPERAND (exp, 1);
1984 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
1988 tree len = c_strlen (TREE_VALUE (TREE_CHAIN (arglist)));
1993 len = size_binop (PLUS_EXPR, len, ssize_int (1));
1994 chainon (arglist, build_tree_list (NULL_TREE, len));
1997 result = expand_builtin_memcpy (arglist);
2000 TREE_CHAIN (TREE_CHAIN (arglist)) = 0;
2004 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
2005 bytes from constant string DATA + OFFSET and return it as target
2009 builtin_strncpy_read_str (data, offset, mode)
2011 HOST_WIDE_INT offset;
2012 enum machine_mode mode;
2014 const char *str = (const char *) data;
2016 if ((unsigned HOST_WIDE_INT) offset > strlen (str))
2019 return c_readstr (str + offset, mode);
2022 /* Expand expression EXP, which is a call to the strncpy builtin. Return 0
2023 if we failed the caller should emit a normal call. */
2026 expand_builtin_strncpy (arglist, target, mode)
2029 enum machine_mode mode;
2031 if (!validate_arglist (arglist,
2032 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2036 tree slen = c_strlen (TREE_VALUE (TREE_CHAIN (arglist)));
2037 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2039 /* We must be passed a constant len parameter. */
2040 if (TREE_CODE (len) != INTEGER_CST)
2043 /* If the len parameter is zero, return the dst parameter. */
2044 if (compare_tree_int (len, 0) == 0)
2046 /* Evaluate and ignore the src argument in case it has
2048 expand_expr (TREE_VALUE (TREE_CHAIN (arglist)), const0_rtx,
2049 VOIDmode, EXPAND_NORMAL);
2050 /* Return the dst parameter. */
2051 return expand_expr (TREE_VALUE (arglist), target, mode,
2055 /* Now, we must be passed a constant src ptr parameter. */
2056 if (slen == 0 || TREE_CODE (slen) != INTEGER_CST)
2059 slen = size_binop (PLUS_EXPR, slen, ssize_int (1));
2061 /* We're required to pad with trailing zeros if the requested
2062 len is greater than strlen(s2)+1. In that case try to
2063 use store_by_pieces, if it fails, punt. */
2064 if (tree_int_cst_lt (slen, len))
2066 tree dest = TREE_VALUE (arglist);
2067 unsigned int dest_align
2068 = get_pointer_alignment (dest, BIGGEST_ALIGNMENT);
2069 const char *p = c_getstr (TREE_VALUE (TREE_CHAIN (arglist)));
2072 if (!p || dest_align == 0 || !host_integerp (len, 1)
2073 || !can_store_by_pieces (tree_low_cst (len, 1),
2074 builtin_strncpy_read_str,
2075 (PTR) p, dest_align))
2078 dest_mem = get_memory_rtx (dest);
2079 store_by_pieces (dest_mem, tree_low_cst (len, 1),
2080 builtin_strncpy_read_str,
2081 (PTR) p, dest_align);
2082 return force_operand (XEXP (dest_mem, 0), NULL_RTX);
2085 /* OK transform into builtin memcpy. */
2086 return expand_builtin_memcpy (arglist);
2090 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
2091 bytes from constant string DATA + OFFSET and return it as target
2095 builtin_memset_read_str (data, offset, mode)
2097 HOST_WIDE_INT offset ATTRIBUTE_UNUSED;
2098 enum machine_mode mode;
2100 const char *c = (const char *) data;
2101 char *p = alloca (GET_MODE_SIZE (mode));
2103 memset (p, *c, GET_MODE_SIZE (mode));
2105 return c_readstr (p, mode);
2108 /* Expand expression EXP, which is a call to the memset builtin. Return 0
2109 if we failed the caller should emit a normal call. */
2112 expand_builtin_memset (exp)
2115 tree arglist = TREE_OPERAND (exp, 1);
2117 if (!validate_arglist (arglist,
2118 POINTER_TYPE, INTEGER_TYPE, INTEGER_TYPE, VOID_TYPE))
2122 tree dest = TREE_VALUE (arglist);
2123 tree val = TREE_VALUE (TREE_CHAIN (arglist));
2124 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2127 unsigned int dest_align
2128 = get_pointer_alignment (dest, BIGGEST_ALIGNMENT);
2129 rtx dest_mem, dest_addr, len_rtx;
2131 /* If DEST is not a pointer type, don't do this
2132 operation in-line. */
2133 if (dest_align == 0)
2136 if (TREE_CODE (val) != INTEGER_CST)
2139 if (target_char_cast (val, &c))
2144 if (!host_integerp (len, 1))
2146 if (current_function_check_memory_usage
2147 || !can_store_by_pieces (tree_low_cst (len, 1),
2148 builtin_memset_read_str,
2149 (PTR) &c, dest_align))
2152 dest_mem = get_memory_rtx (dest);
2153 store_by_pieces (dest_mem, tree_low_cst (len, 1),
2154 builtin_memset_read_str,
2155 (PTR) &c, dest_align);
2156 return force_operand (XEXP (dest_mem, 0), NULL_RTX);
2159 len_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
2161 dest_mem = get_memory_rtx (dest);
2162 set_mem_align (dest_mem, dest_align);
2164 /* Just check DST is writable and mark it as readable. */
2165 if (current_function_check_memory_usage)
2166 emit_library_call (chkr_check_addr_libfunc, LCT_CONST_MAKE_BLOCK,
2167 VOIDmode, 3, XEXP (dest_mem, 0), Pmode,
2168 len_rtx, TYPE_MODE (sizetype),
2169 GEN_INT (MEMORY_USE_WO),
2170 TYPE_MODE (integer_type_node));
2173 dest_addr = clear_storage (dest_mem, len_rtx);
2176 dest_addr = force_operand (XEXP (dest_mem, 0), NULL_RTX);
2182 /* Expand expression EXP, which is a call to the bzero builtin. Return 0
2183 if we failed the caller should emit a normal call. */
2186 expand_builtin_bzero (exp)
2189 tree arglist = TREE_OPERAND (exp, 1);
2190 tree dest, size, newarglist;
2193 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2196 dest = TREE_VALUE (arglist);
2197 size = TREE_VALUE (TREE_CHAIN (arglist));
2199 /* New argument list transforming bzero(ptr x, int y) to
2200 memset(ptr x, int 0, size_t y). */
2202 newarglist = build_tree_list (NULL_TREE, convert (sizetype, size));
2203 newarglist = tree_cons (NULL_TREE, integer_zero_node, newarglist);
2204 newarglist = tree_cons (NULL_TREE, dest, newarglist);
2206 TREE_OPERAND (exp, 1) = newarglist;
2207 result = expand_builtin_memset(exp);
2209 /* Always restore the original arguments. */
2210 TREE_OPERAND (exp, 1) = arglist;
2215 #ifdef HAVE_cmpstrsi
2217 /* Expand expression EXP, which is a call to the memcmp or the strcmp builtin.
2218 ARGLIST is the argument list for this call. Return 0 if we failed and the
2219 caller should emit a normal call, otherwise try to get the result in
2220 TARGET, if convenient. */
2223 expand_builtin_memcmp (exp, arglist, target)
2228 /* If we need to check memory accesses, call the library function. */
2229 if (current_function_check_memory_usage)
2232 if (!validate_arglist (arglist,
2233 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2237 enum machine_mode mode;
2238 tree arg1 = TREE_VALUE (arglist);
2239 tree arg2 = TREE_VALUE (TREE_CHAIN (arglist));
2240 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2241 rtx arg1_rtx, arg2_rtx, arg3_rtx;
2246 = get_pointer_alignment (arg1, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
2248 = get_pointer_alignment (arg2, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
2249 enum machine_mode insn_mode
2250 = insn_data[(int) CODE_FOR_cmpstrsi].operand[0].mode;
2252 /* If we don't have POINTER_TYPE, call the function. */
2253 if (arg1_align == 0 || arg2_align == 0)
2256 /* Make a place to write the result of the instruction. */
2259 && GET_CODE (result) == REG && GET_MODE (result) == insn_mode
2260 && REGNO (result) >= FIRST_PSEUDO_REGISTER))
2261 result = gen_reg_rtx (insn_mode);
2263 arg1_rtx = get_memory_rtx (arg1);
2264 arg2_rtx = get_memory_rtx (arg2);
2265 arg3_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
2269 insn = gen_cmpstrsi (result, arg1_rtx, arg2_rtx, arg3_rtx,
2270 GEN_INT (MIN (arg1_align, arg2_align)));
2275 emit_library_call_value (memcmp_libfunc, result, LCT_PURE_MAKE_BLOCK,
2276 TYPE_MODE (integer_type_node), 3,
2277 XEXP (arg1_rtx, 0), Pmode,
2278 XEXP (arg2_rtx, 0), Pmode,
2279 convert_to_mode (TYPE_MODE (sizetype), arg3_rtx,
2280 TREE_UNSIGNED (sizetype)),
2281 TYPE_MODE (sizetype));
2283 /* Return the value in the proper mode for this function. */
2284 mode = TYPE_MODE (TREE_TYPE (exp));
2285 if (GET_MODE (result) == mode)
2287 else if (target != 0)
2289 convert_move (target, result, 0);
2293 return convert_to_mode (mode, result, 0);
2298 /* Expand expression EXP, which is a call to the strcmp builtin. Return 0
2299 if we failed the caller should emit a normal call, otherwise try to get
2300 the result in TARGET, if convenient. */
2303 expand_builtin_strcmp (exp, target, mode)
2306 enum machine_mode mode;
2308 tree arglist = TREE_OPERAND (exp, 1);
2310 const char *p1, *p2;
2312 /* If we need to check memory accesses, call the library function. */
2313 if (current_function_check_memory_usage)
2316 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2319 arg1 = TREE_VALUE (arglist);
2320 arg2 = TREE_VALUE (TREE_CHAIN (arglist));
2322 p1 = c_getstr (arg1);
2323 p2 = c_getstr (arg2);
2327 const int i = strcmp (p1, p2);
2328 return (i < 0 ? constm1_rtx : (i > 0 ? const1_rtx : const0_rtx));
2331 /* If either arg is "", return an expression corresponding to
2332 (*(const unsigned char*)arg1 - (const unsigned char*)arg2). */
2333 if ((p1 && *p1 == '\0') || (p2 && *p2 == '\0'))
2335 tree cst_uchar_node = build_type_variant (unsigned_char_type_node, 1, 0);
2336 tree cst_uchar_ptr_node = build_pointer_type (cst_uchar_node);
2338 fold (build1 (CONVERT_EXPR, integer_type_node,
2339 build1 (INDIRECT_REF, cst_uchar_node,
2340 build1 (NOP_EXPR, cst_uchar_ptr_node, arg1))));
2342 fold (build1 (CONVERT_EXPR, integer_type_node,
2343 build1 (INDIRECT_REF, cst_uchar_node,
2344 build1 (NOP_EXPR, cst_uchar_ptr_node, arg2))));
2345 tree result = fold (build (MINUS_EXPR, integer_type_node, ind1, ind2));
2346 return expand_expr (result, target, mode, EXPAND_NORMAL);
2349 #ifdef HAVE_cmpstrsi
2350 if (! HAVE_cmpstrsi)
2354 tree len = c_strlen (arg1);
2355 tree len2 = c_strlen (arg2);
2359 len = size_binop (PLUS_EXPR, ssize_int (1), len);
2362 len2 = size_binop (PLUS_EXPR, ssize_int (1), len2);
2364 /* If we don't have a constant length for the first, use the length
2365 of the second, if we know it. We don't require a constant for
2366 this case; some cost analysis could be done if both are available
2367 but neither is constant. For now, assume they're equally cheap
2368 unless one has side effects.
2370 If both strings have constant lengths, use the smaller. This
2371 could arise if optimization results in strcpy being called with
2372 two fixed strings, or if the code was machine-generated. We should
2373 add some code to the `memcmp' handler below to deal with such
2374 situations, someday. */
2376 if (!len || TREE_CODE (len) != INTEGER_CST)
2378 if (len2 && !TREE_SIDE_EFFECTS (len2))
2383 else if (len2 && TREE_CODE (len2) == INTEGER_CST
2384 && tree_int_cst_lt (len2, len))
2387 /* If both arguments have side effects, we cannot optimize. */
2388 if (TREE_SIDE_EFFECTS (len))
2391 chainon (arglist, build_tree_list (NULL_TREE, len));
2392 result = expand_builtin_memcmp (exp, arglist, target);
2394 TREE_CHAIN (TREE_CHAIN (arglist)) = 0;
2403 /* Expand expression EXP, which is a call to the strncmp builtin. Return 0
2404 if we failed the caller should emit a normal call, otherwise try to get
2405 the result in TARGET, if convenient. */
2408 expand_builtin_strncmp (exp, target, mode)
2411 enum machine_mode mode;
2413 tree arglist = TREE_OPERAND (exp, 1);
2414 tree arg1, arg2, arg3;
2415 const char *p1, *p2;
2417 /* If we need to check memory accesses, call the library function. */
2418 if (current_function_check_memory_usage)
2421 if (!validate_arglist (arglist,
2422 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2425 arg1 = TREE_VALUE (arglist);
2426 arg2 = TREE_VALUE (TREE_CHAIN (arglist));
2427 arg3 = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2429 /* If the len parameter is zero, return zero. */
2430 if (host_integerp (arg3, 1) && tree_low_cst (arg3, 1) == 0)
2432 /* Evaluate and ignore arg1 and arg2 in case they have
2434 expand_expr (arg1, const0_rtx, VOIDmode, EXPAND_NORMAL);
2435 expand_expr (arg2, const0_rtx, VOIDmode, EXPAND_NORMAL);
2439 p1 = c_getstr (arg1);
2440 p2 = c_getstr (arg2);
2442 /* If all arguments are constant, evaluate at compile-time. */
2443 if (host_integerp (arg3, 1) && p1 && p2)
2445 const int r = strncmp (p1, p2, tree_low_cst (arg3, 1));
2446 return (r < 0 ? constm1_rtx : (r > 0 ? const1_rtx : const0_rtx));
2449 /* If len == 1 or (either string parameter is "" and (len >= 1)),
2450 return (*(const u_char*)arg1 - *(const u_char*)arg2). */
2451 if (host_integerp (arg3, 1)
2452 && (tree_low_cst (arg3, 1) == 1
2453 || (tree_low_cst (arg3, 1) > 1
2454 && ((p1 && *p1 == '\0') || (p2 && *p2 == '\0')))))
2456 tree cst_uchar_node = build_type_variant (unsigned_char_type_node, 1, 0);
2457 tree cst_uchar_ptr_node = build_pointer_type (cst_uchar_node);
2459 fold (build1 (CONVERT_EXPR, integer_type_node,
2460 build1 (INDIRECT_REF, cst_uchar_node,
2461 build1 (NOP_EXPR, cst_uchar_ptr_node, arg1))));
2463 fold (build1 (CONVERT_EXPR, integer_type_node,
2464 build1 (INDIRECT_REF, cst_uchar_node,
2465 build1 (NOP_EXPR, cst_uchar_ptr_node, arg2))));
2466 tree result = fold (build (MINUS_EXPR, integer_type_node, ind1, ind2));
2467 return expand_expr (result, target, mode, EXPAND_NORMAL);
2470 #ifdef HAVE_cmpstrsi
2471 /* If c_strlen can determine an expression for one of the string
2472 lengths, and it doesn't have side effects, then call
2473 expand_builtin_memcmp() using length MIN(strlen(string)+1, arg3). */
2476 tree newarglist, len = 0;
2478 /* Perhaps one of the strings is really constant, if so prefer
2479 that constant length over the other string's length. */
2481 len = c_strlen (arg1);
2483 len = c_strlen (arg2);
2485 /* If we still don't have a len, try either string arg as long
2486 as they don't have side effects. */
2487 if (!len && !TREE_SIDE_EFFECTS (arg1))
2488 len = c_strlen (arg1);
2489 if (!len && !TREE_SIDE_EFFECTS (arg2))
2490 len = c_strlen (arg2);
2491 /* If we still don't have a length, punt. */
2495 /* Add one to the string length. */
2496 len = fold (size_binop (PLUS_EXPR, len, ssize_int (1)));
2498 /* The actual new length parameter is MIN(len,arg3). */
2499 len = fold (build (MIN_EXPR, TREE_TYPE (len), len, arg3));
2501 newarglist = build_tree_list (NULL_TREE, len);
2502 newarglist = tree_cons (NULL_TREE, arg2, newarglist);
2503 newarglist = tree_cons (NULL_TREE, arg1, newarglist);
2504 return expand_builtin_memcmp (exp, newarglist, target);
2511 /* Expand expression EXP, which is a call to the strcat builtin.
2512 Return 0 if we failed the caller should emit a normal call,
2513 otherwise try to get the result in TARGET, if convenient. */
2516 expand_builtin_strcat (arglist, target, mode)
2519 enum machine_mode mode;
2521 /* If we need to check memory accesses, call the library function. */
2522 if (current_function_check_memory_usage)
2525 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2529 tree dst = TREE_VALUE (arglist),
2530 src = TREE_VALUE (TREE_CHAIN (arglist));
2531 const char *p = c_getstr (src);
2533 /* If the string length is zero, return the dst parameter. */
2534 if (p && *p == '\0')
2535 return expand_expr (dst, target, mode, EXPAND_NORMAL);
2541 /* Expand expression EXP, which is a call to the strncat builtin.
2542 Return 0 if we failed the caller should emit a normal call,
2543 otherwise try to get the result in TARGET, if convenient. */
2546 expand_builtin_strncat (arglist, target, mode)
2549 enum machine_mode mode;
2551 /* If we need to check memory accesses, call the library function. */
2552 if (current_function_check_memory_usage)
2555 if (!validate_arglist (arglist,
2556 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2560 tree dst = TREE_VALUE (arglist),
2561 src = TREE_VALUE (TREE_CHAIN (arglist)),
2562 len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2563 const char *p = c_getstr (src);
2565 /* If the requested length is zero, or the src parameter string
2566 length is zero, return the dst parameter. */
2567 if ((TREE_CODE (len) == INTEGER_CST && compare_tree_int (len, 0) == 0)
2568 || (p && *p == '\0'))
2570 /* Evaluate and ignore the src and len parameters in case
2571 they have side-effects. */
2572 expand_expr (src, const0_rtx, VOIDmode, EXPAND_NORMAL);
2573 expand_expr (len, const0_rtx, VOIDmode, EXPAND_NORMAL);
2574 return expand_expr (dst, target, mode, EXPAND_NORMAL);
2577 /* If the requested len is greater than or equal to the string
2578 length, call strcat. */
2579 if (TREE_CODE (len) == INTEGER_CST && p
2580 && compare_tree_int (len, strlen (p)) >= 0)
2583 tree_cons (NULL_TREE, dst, build_tree_list (NULL_TREE, src)),
2584 fn = built_in_decls[BUILT_IN_STRCAT];
2586 /* If the replacement _DECL isn't initialized, don't do the
2591 return expand_expr (build_function_call_expr (fn, newarglist),
2592 target, mode, EXPAND_NORMAL);
2598 /* Expand expression EXP, which is a call to the strspn builtin.
2599 Return 0 if we failed the caller should emit a normal call,
2600 otherwise try to get the result in TARGET, if convenient. */
2603 expand_builtin_strspn (arglist, target, mode)
2606 enum machine_mode mode;
2608 /* If we need to check memory accesses, call the library function. */
2609 if (current_function_check_memory_usage)
2612 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2616 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
2617 const char *p1 = c_getstr (s1), *p2 = c_getstr (s2);
2619 /* If both arguments are constants, evaluate at compile-time. */
2622 const size_t r = strspn (p1, p2);
2623 return expand_expr (size_int (r), target, mode, EXPAND_NORMAL);
2626 /* If either argument is "", return 0. */
2627 if ((p1 && *p1 == '\0') || (p2 && *p2 == '\0'))
2629 /* Evaluate and ignore both arguments in case either one has
2631 expand_expr (s1, const0_rtx, VOIDmode, EXPAND_NORMAL);
2632 expand_expr (s2, const0_rtx, VOIDmode, EXPAND_NORMAL);
2639 /* Expand expression EXP, which is a call to the strcspn builtin.
2640 Return 0 if we failed the caller should emit a normal call,
2641 otherwise try to get the result in TARGET, if convenient. */
2644 expand_builtin_strcspn (arglist, target, mode)
2647 enum machine_mode mode;
2649 /* If we need to check memory accesses, call the library function. */
2650 if (current_function_check_memory_usage)
2653 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2657 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
2658 const char *p1 = c_getstr (s1), *p2 = c_getstr (s2);
2660 /* If both arguments are constants, evaluate at compile-time. */
2663 const size_t r = strcspn (p1, p2);
2664 return expand_expr (size_int (r), target, mode, EXPAND_NORMAL);
2667 /* If the first argument is "", return 0. */
2668 if (p1 && *p1 == '\0')
2670 /* Evaluate and ignore argument s2 in case it has
2672 expand_expr (s2, const0_rtx, VOIDmode, EXPAND_NORMAL);
2676 /* If the second argument is "", return __builtin_strlen(s1). */
2677 if (p2 && *p2 == '\0')
2679 tree newarglist = build_tree_list (NULL_TREE, s1),
2680 fn = built_in_decls[BUILT_IN_STRLEN];
2682 /* If the replacement _DECL isn't initialized, don't do the
2687 return expand_expr (build_function_call_expr (fn, newarglist),
2688 target, mode, EXPAND_NORMAL);
2694 /* Expand a call to __builtin_saveregs, generating the result in TARGET,
2695 if that's convenient. */
2698 expand_builtin_saveregs ()
2702 /* Don't do __builtin_saveregs more than once in a function.
2703 Save the result of the first call and reuse it. */
2704 if (saveregs_value != 0)
2705 return saveregs_value;
2707 /* When this function is called, it means that registers must be
2708 saved on entry to this function. So we migrate the call to the
2709 first insn of this function. */
2713 #ifdef EXPAND_BUILTIN_SAVEREGS
2714 /* Do whatever the machine needs done in this case. */
2715 val = EXPAND_BUILTIN_SAVEREGS ();
2717 /* ??? We used to try and build up a call to the out of line function,
2718 guessing about what registers needed saving etc. This became much
2719 harder with __builtin_va_start, since we don't have a tree for a
2720 call to __builtin_saveregs to fall back on. There was exactly one
2721 port (i860) that used this code, and I'm unconvinced it could actually
2722 handle the general case. So we no longer try to handle anything
2723 weird and make the backend absorb the evil. */
2725 error ("__builtin_saveregs not supported by this target");
2732 saveregs_value = val;
2734 /* Put the sequence after the NOTE that starts the function. If this
2735 is inside a SEQUENCE, make the outer-level insn chain current, so
2736 the code is placed at the start of the function. */
2737 push_topmost_sequence ();
2738 emit_insns_after (seq, get_insns ());
2739 pop_topmost_sequence ();
2744 /* __builtin_args_info (N) returns word N of the arg space info
2745 for the current function. The number and meanings of words
2746 is controlled by the definition of CUMULATIVE_ARGS. */
2749 expand_builtin_args_info (exp)
2752 tree arglist = TREE_OPERAND (exp, 1);
2753 int nwords = sizeof (CUMULATIVE_ARGS) / sizeof (int);
2754 int *word_ptr = (int *) ¤t_function_args_info;
2756 /* These are used by the code below that is if 0'ed away */
2758 tree type, elts, result;
2761 if (sizeof (CUMULATIVE_ARGS) % sizeof (int) != 0)
2766 if (!host_integerp (TREE_VALUE (arglist), 0))
2767 error ("argument of `__builtin_args_info' must be constant");
2770 HOST_WIDE_INT wordnum = tree_low_cst (TREE_VALUE (arglist), 0);
2772 if (wordnum < 0 || wordnum >= nwords)
2773 error ("argument of `__builtin_args_info' out of range");
2775 return GEN_INT (word_ptr[wordnum]);
2779 error ("missing argument in `__builtin_args_info'");
2784 for (i = 0; i < nwords; i++)
2785 elts = tree_cons (NULL_TREE, build_int_2 (word_ptr[i], 0));
2787 type = build_array_type (integer_type_node,
2788 build_index_type (build_int_2 (nwords, 0)));
2789 result = build (CONSTRUCTOR, type, NULL_TREE, nreverse (elts));
2790 TREE_CONSTANT (result) = 1;
2791 TREE_STATIC (result) = 1;
2792 result = build1 (INDIRECT_REF, build_pointer_type (type), result);
2793 TREE_CONSTANT (result) = 1;
2794 return expand_expr (result, NULL_RTX, VOIDmode, EXPAND_MEMORY_USE_BAD);
2798 /* Expand ARGLIST, from a call to __builtin_next_arg. */
2801 expand_builtin_next_arg (arglist)
2804 tree fntype = TREE_TYPE (current_function_decl);
2806 if ((TYPE_ARG_TYPES (fntype) == 0
2807 || (TREE_VALUE (tree_last (TYPE_ARG_TYPES (fntype)))
2809 && ! current_function_varargs)
2811 error ("`va_start' used in function with fixed args");
2817 tree last_parm = tree_last (DECL_ARGUMENTS (current_function_decl));
2818 tree arg = TREE_VALUE (arglist);
2820 /* Strip off all nops for the sake of the comparison. This
2821 is not quite the same as STRIP_NOPS. It does more.
2822 We must also strip off INDIRECT_EXPR for C++ reference
2824 while (TREE_CODE (arg) == NOP_EXPR
2825 || TREE_CODE (arg) == CONVERT_EXPR
2826 || TREE_CODE (arg) == NON_LVALUE_EXPR
2827 || TREE_CODE (arg) == INDIRECT_REF)
2828 arg = TREE_OPERAND (arg, 0);
2829 if (arg != last_parm)
2830 warning ("second parameter of `va_start' not last named argument");
2832 else if (! current_function_varargs)
2833 /* Evidently an out of date version of <stdarg.h>; can't validate
2834 va_start's second argument, but can still work as intended. */
2835 warning ("`__builtin_next_arg' called without an argument");
2837 return expand_binop (Pmode, add_optab,
2838 current_function_internal_arg_pointer,
2839 current_function_arg_offset_rtx,
2840 NULL_RTX, 0, OPTAB_LIB_WIDEN);
2843 /* Make it easier for the backends by protecting the valist argument
2844 from multiple evaluations. */
2847 stabilize_va_list (valist, needs_lvalue)
2851 if (TREE_CODE (va_list_type_node) == ARRAY_TYPE)
2853 if (TREE_SIDE_EFFECTS (valist))
2854 valist = save_expr (valist);
2856 /* For this case, the backends will be expecting a pointer to
2857 TREE_TYPE (va_list_type_node), but it's possible we've
2858 actually been given an array (an actual va_list_type_node).
2860 if (TREE_CODE (TREE_TYPE (valist)) == ARRAY_TYPE)
2862 tree p1 = build_pointer_type (TREE_TYPE (va_list_type_node));
2863 tree p2 = build_pointer_type (va_list_type_node);
2865 valist = build1 (ADDR_EXPR, p2, valist);
2866 valist = fold (build1 (NOP_EXPR, p1, valist));
2875 if (! TREE_SIDE_EFFECTS (valist))
2878 pt = build_pointer_type (va_list_type_node);
2879 valist = fold (build1 (ADDR_EXPR, pt, valist));
2880 TREE_SIDE_EFFECTS (valist) = 1;
2883 if (TREE_SIDE_EFFECTS (valist))
2884 valist = save_expr (valist);
2885 valist = fold (build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (valist)),
2892 /* The "standard" implementation of va_start: just assign `nextarg' to
2896 std_expand_builtin_va_start (stdarg_p, valist, nextarg)
2905 /* The dummy named parameter is declared as a 'word' sized
2906 object, but if a 'word' is smaller than an 'int', it would
2907 have been promoted to int when it was added to the arglist. */
2908 int align = PARM_BOUNDARY / BITS_PER_UNIT;
2909 int size = MAX (UNITS_PER_WORD,
2910 GET_MODE_SIZE (TYPE_MODE (integer_type_node)));
2911 int offset = ((size + align - 1) / align) * align;
2912 nextarg = plus_constant (nextarg, -offset);
2915 t = build (MODIFY_EXPR, TREE_TYPE (valist), valist,
2916 make_tree (ptr_type_node, nextarg));
2917 TREE_SIDE_EFFECTS (t) = 1;
2919 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
2922 /* Expand ARGLIST, which from a call to __builtin_stdarg_va_start or
2923 __builtin_varargs_va_start, depending on STDARG_P. */
2926 expand_builtin_va_start (stdarg_p, arglist)
2931 tree chain = arglist, valist;
2934 nextarg = expand_builtin_next_arg (chain = TREE_CHAIN (arglist));
2936 nextarg = expand_builtin_next_arg (NULL_TREE);
2938 if (TREE_CHAIN (chain))
2939 error ("too many arguments to function `va_start'");
2941 valist = stabilize_va_list (TREE_VALUE (arglist), 1);
2943 #ifdef EXPAND_BUILTIN_VA_START
2944 EXPAND_BUILTIN_VA_START (stdarg_p, valist, nextarg);
2946 std_expand_builtin_va_start (stdarg_p, valist, nextarg);
2952 /* The "standard" implementation of va_arg: read the value from the
2953 current (padded) address and increment by the (padded) size. */
2956 std_expand_builtin_va_arg (valist, type)
2960 HOST_WIDE_INT align;
2961 HOST_WIDE_INT rounded_size;
2964 /* Compute the rounded size of the type. */
2965 align = PARM_BOUNDARY / BITS_PER_UNIT;
2966 rounded_size = (((int_size_in_bytes (type) + align - 1) / align) * align);
2970 if (PAD_VARARGS_DOWN)
2972 /* Small args are padded downward. */
2975 = rounded_size > align ? rounded_size : int_size_in_bytes (type);
2977 addr_tree = build (PLUS_EXPR, TREE_TYPE (addr_tree), addr_tree,
2978 build_int_2 (rounded_size - adj, 0));
2981 addr = expand_expr (addr_tree, NULL_RTX, Pmode, EXPAND_NORMAL);
2982 addr = copy_to_reg (addr);
2984 /* Compute new value for AP. */
2985 t = build (MODIFY_EXPR, TREE_TYPE (valist), valist,
2986 build (PLUS_EXPR, TREE_TYPE (valist), valist,
2987 build_int_2 (rounded_size, 0)));
2988 TREE_SIDE_EFFECTS (t) = 1;
2989 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
2994 /* Expand __builtin_va_arg, which is not really a builtin function, but
2995 a very special sort of operator. */
2998 expand_builtin_va_arg (valist, type)
3002 tree promoted_type, want_va_type, have_va_type;
3004 /* Verify that valist is of the proper type. */
3006 want_va_type = va_list_type_node;
3007 have_va_type = TREE_TYPE (valist);
3008 if (TREE_CODE (want_va_type) == ARRAY_TYPE)
3010 /* If va_list is an array type, the argument may have decayed
3011 to a pointer type, e.g. by being passed to another function.
3012 In that case, unwrap both types so that we can compare the
3013 underlying records. */
3014 if (TREE_CODE (have_va_type) == ARRAY_TYPE
3015 || TREE_CODE (have_va_type) == POINTER_TYPE)
3017 want_va_type = TREE_TYPE (want_va_type);
3018 have_va_type = TREE_TYPE (have_va_type);
3021 if (TYPE_MAIN_VARIANT (want_va_type) != TYPE_MAIN_VARIANT (have_va_type))
3023 error ("first argument to `va_arg' not of type `va_list'");
3027 /* Generate a diagnostic for requesting data of a type that cannot
3028 be passed through `...' due to type promotion at the call site. */
3029 else if ((promoted_type = (*lang_type_promotes_to) (type)) != NULL_TREE)
3031 const char *name = "<anonymous type>", *pname = 0;
3032 static int gave_help;
3034 if (TYPE_NAME (type))
3036 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
3037 name = IDENTIFIER_POINTER (TYPE_NAME (type));
3038 else if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
3039 && DECL_NAME (TYPE_NAME (type)))
3040 name = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type)));
3042 if (TYPE_NAME (promoted_type))
3044 if (TREE_CODE (TYPE_NAME (promoted_type)) == IDENTIFIER_NODE)
3045 pname = IDENTIFIER_POINTER (TYPE_NAME (promoted_type));
3046 else if (TREE_CODE (TYPE_NAME (promoted_type)) == TYPE_DECL
3047 && DECL_NAME (TYPE_NAME (promoted_type)))
3048 pname = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (promoted_type)));
3051 error ("`%s' is promoted to `%s' when passed through `...'", name, pname);
3055 error ("(so you should pass `%s' not `%s' to `va_arg')", pname, name);
3062 /* Make it easier for the backends by protecting the valist argument
3063 from multiple evaluations. */
3064 valist = stabilize_va_list (valist, 0);
3066 #ifdef EXPAND_BUILTIN_VA_ARG
3067 addr = EXPAND_BUILTIN_VA_ARG (valist, type);
3069 addr = std_expand_builtin_va_arg (valist, type);
3073 #ifdef POINTERS_EXTEND_UNSIGNED
3074 if (GET_MODE (addr) != Pmode)
3075 addr = convert_memory_address (Pmode, addr);
3078 result = gen_rtx_MEM (TYPE_MODE (type), addr);
3079 set_mem_alias_set (result, get_varargs_alias_set ());
3084 /* Expand ARGLIST, from a call to __builtin_va_end. */
3087 expand_builtin_va_end (arglist)
3090 tree valist = TREE_VALUE (arglist);
3092 #ifdef EXPAND_BUILTIN_VA_END
3093 valist = stabilize_va_list (valist, 0);
3094 EXPAND_BUILTIN_VA_END(arglist);
3096 /* Evaluate for side effects, if needed. I hate macros that don't
3098 if (TREE_SIDE_EFFECTS (valist))
3099 expand_expr (valist, const0_rtx, VOIDmode, EXPAND_NORMAL);
3105 /* Expand ARGLIST, from a call to __builtin_va_copy. We do this as a
3106 builtin rather than just as an assignment in stdarg.h because of the
3107 nastiness of array-type va_list types. */
3110 expand_builtin_va_copy (arglist)
3115 dst = TREE_VALUE (arglist);
3116 src = TREE_VALUE (TREE_CHAIN (arglist));
3118 dst = stabilize_va_list (dst, 1);
3119 src = stabilize_va_list (src, 0);
3121 if (TREE_CODE (va_list_type_node) != ARRAY_TYPE)
3123 t = build (MODIFY_EXPR, va_list_type_node, dst, src);
3124 TREE_SIDE_EFFECTS (t) = 1;
3125 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
3129 rtx dstb, srcb, size;
3131 /* Evaluate to pointers. */
3132 dstb = expand_expr (dst, NULL_RTX, Pmode, EXPAND_NORMAL);
3133 srcb = expand_expr (src, NULL_RTX, Pmode, EXPAND_NORMAL);
3134 size = expand_expr (TYPE_SIZE_UNIT (va_list_type_node), NULL_RTX,
3135 VOIDmode, EXPAND_NORMAL);
3137 #ifdef POINTERS_EXTEND_UNSIGNED
3138 if (GET_MODE (dstb) != Pmode)
3139 dstb = convert_memory_address (Pmode, dstb);
3141 if (GET_MODE (srcb) != Pmode)
3142 srcb = convert_memory_address (Pmode, srcb);
3145 /* "Dereference" to BLKmode memories. */
3146 dstb = gen_rtx_MEM (BLKmode, dstb);
3147 set_mem_alias_set (dstb, get_alias_set (TREE_TYPE (TREE_TYPE (dst))));
3148 set_mem_align (dstb, TYPE_ALIGN (va_list_type_node));
3149 srcb = gen_rtx_MEM (BLKmode, srcb);
3150 set_mem_alias_set (srcb, get_alias_set (TREE_TYPE (TREE_TYPE (src))));
3151 set_mem_align (srcb, TYPE_ALIGN (va_list_type_node));
3154 emit_block_move (dstb, srcb, size);
3160 /* Expand a call to one of the builtin functions __builtin_frame_address or
3161 __builtin_return_address. */
3164 expand_builtin_frame_address (exp)
3167 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
3168 tree arglist = TREE_OPERAND (exp, 1);
3170 /* The argument must be a nonnegative integer constant.
3171 It counts the number of frames to scan up the stack.
3172 The value is the return address saved in that frame. */
3174 /* Warning about missing arg was already issued. */
3176 else if (! host_integerp (TREE_VALUE (arglist), 1))
3178 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
3179 error ("invalid arg to `__builtin_frame_address'");
3181 error ("invalid arg to `__builtin_return_address'");
3187 = expand_builtin_return_addr (DECL_FUNCTION_CODE (fndecl),
3188 tree_low_cst (TREE_VALUE (arglist), 1),
3189 hard_frame_pointer_rtx);
3191 /* Some ports cannot access arbitrary stack frames. */
3194 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
3195 warning ("unsupported arg to `__builtin_frame_address'");
3197 warning ("unsupported arg to `__builtin_return_address'");
3201 /* For __builtin_frame_address, return what we've got. */
3202 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
3205 if (GET_CODE (tem) != REG
3206 && ! CONSTANT_P (tem))
3207 tem = copy_to_mode_reg (Pmode, tem);
3212 /* Expand a call to the alloca builtin, with arguments ARGLIST. Return 0 if
3213 we failed and the caller should emit a normal call, otherwise try to get
3214 the result in TARGET, if convenient. */
3217 expand_builtin_alloca (arglist, target)
3224 if (!validate_arglist (arglist, INTEGER_TYPE, VOID_TYPE))
3227 /* Compute the argument. */
3228 op0 = expand_expr (TREE_VALUE (arglist), NULL_RTX, VOIDmode, 0);
3230 /* Allocate the desired space. */
3231 result = allocate_dynamic_stack_space (op0, target, BITS_PER_UNIT);
3233 #ifdef POINTERS_EXTEND_UNSIGNED
3234 if (GET_MODE (result) != ptr_mode)
3235 result = convert_memory_address (ptr_mode, result);
3241 /* Expand a call to the ffs builtin. The arguments are in ARGLIST.
3242 Return 0 if a normal call should be emitted rather than expanding the
3243 function in-line. If convenient, the result should be placed in TARGET.
3244 SUBTARGET may be used as the target for computing one of EXP's operands. */
3247 expand_builtin_ffs (arglist, target, subtarget)
3249 rtx target, subtarget;
3252 if (!validate_arglist (arglist, INTEGER_TYPE, VOID_TYPE))
3255 /* Compute the argument. */
3256 op0 = expand_expr (TREE_VALUE (arglist), subtarget, VOIDmode, 0);
3257 /* Compute ffs, into TARGET if possible.
3258 Set TARGET to wherever the result comes back. */
3259 target = expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist))),
3260 ffs_optab, op0, target, 1);
3266 /* If the string passed to fputs is a constant and is one character
3267 long, we attempt to transform this call into __builtin_fputc(). */
3270 expand_builtin_fputs (arglist, ignore)
3274 tree len, fn, fn_fputc = built_in_decls[BUILT_IN_FPUTC],
3275 fn_fwrite = built_in_decls[BUILT_IN_FWRITE];
3277 /* If the return value is used, or the replacement _DECL isn't
3278 initialized, don't do the transformation. */
3279 if (!ignore || !fn_fputc || !fn_fwrite)
3282 /* Verify the arguments in the original call. */
3283 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE)
3284 || current_function_check_memory_usage)
3287 /* Get the length of the string passed to fputs. If the length
3288 can't be determined, punt. */
3289 if (!(len = c_strlen (TREE_VALUE (arglist)))
3290 || TREE_CODE (len) != INTEGER_CST)
3293 switch (compare_tree_int (len, 1))
3295 case -1: /* length is 0, delete the call entirely . */
3297 /* Evaluate and ignore the argument in case it has
3299 expand_expr (TREE_VALUE (TREE_CHAIN (arglist)), const0_rtx,
3300 VOIDmode, EXPAND_NORMAL);
3303 case 0: /* length is 1, call fputc. */
3305 const char *p = c_getstr (TREE_VALUE (arglist));
3309 /* New argument list transforming fputs(string, stream) to
3310 fputc(string[0], stream). */
3312 build_tree_list (NULL_TREE, TREE_VALUE (TREE_CHAIN (arglist)));
3314 tree_cons (NULL_TREE, build_int_2 (p[0], 0), arglist);
3320 case 1: /* length is greater than 1, call fwrite. */
3322 tree string_arg = TREE_VALUE (arglist);
3324 /* New argument list transforming fputs(string, stream) to
3325 fwrite(string, 1, len, stream). */
3326 arglist = build_tree_list (NULL_TREE, TREE_VALUE (TREE_CHAIN (arglist)));
3327 arglist = tree_cons (NULL_TREE, len, arglist);
3328 arglist = tree_cons (NULL_TREE, size_one_node, arglist);
3329 arglist = tree_cons (NULL_TREE, string_arg, arglist);
3337 return expand_expr (build_function_call_expr (fn, arglist),
3338 (ignore ? const0_rtx : NULL_RTX),
3339 VOIDmode, EXPAND_NORMAL);
3342 /* Expand a call to __builtin_expect. We return our argument and emit a
3343 NOTE_INSN_EXPECTED_VALUE note. This is the expansion of __builtin_expect in
3344 a non-jump context. */
3347 expand_builtin_expect (arglist, target)
3354 if (arglist == NULL_TREE
3355 || TREE_CHAIN (arglist) == NULL_TREE)
3357 exp = TREE_VALUE (arglist);
3358 c = TREE_VALUE (TREE_CHAIN (arglist));
3360 if (TREE_CODE (c) != INTEGER_CST)
3362 error ("second arg to `__builtin_expect' must be a constant");
3363 c = integer_zero_node;
3366 target = expand_expr (exp, target, VOIDmode, EXPAND_NORMAL);
3368 /* Don't bother with expected value notes for integral constants. */
3369 if (GET_CODE (target) != CONST_INT)
3371 /* We do need to force this into a register so that we can be
3372 moderately sure to be able to correctly interpret the branch
3374 target = force_reg (GET_MODE (target), target);
3376 rtx_c = expand_expr (c, NULL_RTX, GET_MODE (target), EXPAND_NORMAL);
3378 note = emit_note (NULL, NOTE_INSN_EXPECTED_VALUE);
3379 NOTE_EXPECTED_VALUE (note) = gen_rtx_EQ (VOIDmode, target, rtx_c);
3385 /* Like expand_builtin_expect, except do this in a jump context. This is
3386 called from do_jump if the conditional is a __builtin_expect. Return either
3387 a SEQUENCE of insns to emit the jump or NULL if we cannot optimize
3388 __builtin_expect. We need to optimize this at jump time so that machines
3389 like the PowerPC don't turn the test into a SCC operation, and then jump
3390 based on the test being 0/1. */
3393 expand_builtin_expect_jump (exp, if_false_label, if_true_label)
3398 tree arglist = TREE_OPERAND (exp, 1);
3399 tree arg0 = TREE_VALUE (arglist);
3400 tree arg1 = TREE_VALUE (TREE_CHAIN (arglist));
3403 /* Only handle __builtin_expect (test, 0) and
3404 __builtin_expect (test, 1). */
3405 if (TREE_CODE (TREE_TYPE (arg1)) == INTEGER_TYPE
3406 && (integer_zerop (arg1) || integer_onep (arg1)))
3411 /* If we fail to locate an appropriate conditional jump, we'll
3412 fall back to normal evaluation. Ensure that the expression
3413 can be re-evaluated. */
3414 switch (unsafe_for_reeval (arg0))
3419 case 1: /* Mildly unsafe. */
3420 arg0 = unsave_expr (arg0);
3423 case 2: /* Wildly unsafe. */
3427 /* Expand the jump insns. */
3429 do_jump (arg0, if_false_label, if_true_label);
3430 ret = gen_sequence ();
3433 /* Now that the __builtin_expect has been validated, go through and add
3434 the expect's to each of the conditional jumps. If we run into an
3435 error, just give up and generate the 'safe' code of doing a SCC
3436 operation and then doing a branch on that. */
3437 for (j = 0; j < XVECLEN (ret, 0); j++)
3439 rtx insn = XVECEXP (ret, 0, j);
3442 if (GET_CODE (insn) == JUMP_INSN && any_condjump_p (insn)
3443 && (pattern = pc_set (insn)) != NULL_RTX)
3445 rtx ifelse = SET_SRC (pattern);
3449 if (GET_CODE (ifelse) != IF_THEN_ELSE)
3452 if (GET_CODE (XEXP (ifelse, 1)) == LABEL_REF)
3455 label = XEXP (XEXP (ifelse, 1), 0);
3457 /* An inverted jump reverses the probabilities. */
3458 else if (GET_CODE (XEXP (ifelse, 2)) == LABEL_REF)
3461 label = XEXP (XEXP (ifelse, 2), 0);
3463 /* We shouldn't have to worry about conditional returns during
3464 the expansion stage, but handle it gracefully anyway. */
3465 else if (GET_CODE (XEXP (ifelse, 1)) == RETURN)
3470 /* An inverted return reverses the probabilities. */
3471 else if (GET_CODE (XEXP (ifelse, 2)) == RETURN)
3479 /* If the test is expected to fail, reverse the
3481 if (integer_zerop (arg1))
3484 /* If we are jumping to the false label, reverse the
3486 if (label == NULL_RTX)
3487 ; /* conditional return */
3488 else if (label == if_false_label)
3490 else if (label != if_true_label)
3494 predict_insn_def (insn, PRED_BUILTIN_EXPECT, taken);
3498 /* If no jumps were modified, fail and do __builtin_expect the normal
3507 /* Expand an expression EXP that calls a built-in function,
3508 with result going to TARGET if that's convenient
3509 (and in mode MODE if that's convenient).
3510 SUBTARGET may be used as the target for computing one of EXP's operands.
3511 IGNORE is nonzero if the value is to be ignored. */
3514 expand_builtin (exp, target, subtarget, mode, ignore)
3518 enum machine_mode mode;
3521 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
3522 tree arglist = TREE_OPERAND (exp, 1);
3523 enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
3525 if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_MD)
3526 return (*targetm.expand_builtin) (exp, target, subtarget, mode, ignore);
3528 /* When not optimizing, generate calls to library functions for a certain
3530 if (! optimize && ! CALLED_AS_BUILT_IN (fndecl)
3531 && (fcode == BUILT_IN_SIN || fcode == BUILT_IN_COS
3532 || fcode == BUILT_IN_FSQRT || fcode == BUILT_IN_SQRTF
3533 || fcode == BUILT_IN_SQRTL || fcode == BUILT_IN_MEMSET
3534 || fcode == BUILT_IN_MEMCPY || fcode == BUILT_IN_MEMCMP
3535 || fcode == BUILT_IN_BCMP || fcode == BUILT_IN_BZERO
3536 || fcode == BUILT_IN_INDEX || fcode == BUILT_IN_RINDEX
3537 || fcode == BUILT_IN_STRCHR || fcode == BUILT_IN_STRRCHR
3538 || fcode == BUILT_IN_STRLEN || fcode == BUILT_IN_STRCPY
3539 || fcode == BUILT_IN_STRNCPY || fcode == BUILT_IN_STRNCMP
3540 || fcode == BUILT_IN_STRSTR || fcode == BUILT_IN_STRPBRK
3541 || fcode == BUILT_IN_STRCAT || fcode == BUILT_IN_STRNCAT
3542 || fcode == BUILT_IN_STRSPN || fcode == BUILT_IN_STRCSPN
3543 || fcode == BUILT_IN_STRCMP || fcode == BUILT_IN_FFS
3544 || fcode == BUILT_IN_PUTCHAR || fcode == BUILT_IN_PUTS
3545 || fcode == BUILT_IN_PRINTF || fcode == BUILT_IN_FPUTC
3546 || fcode == BUILT_IN_FPUTS || fcode == BUILT_IN_FWRITE))
3547 return expand_call (exp, target, ignore);
3553 case BUILT_IN_LLABS:
3554 case BUILT_IN_IMAXABS:
3556 case BUILT_IN_FABSF:
3557 case BUILT_IN_FABSL:
3558 /* build_function_call changes these into ABS_EXPR. */
3562 case BUILT_IN_CONJF:
3563 case BUILT_IN_CONJL:
3564 case BUILT_IN_CREAL:
3565 case BUILT_IN_CREALF:
3566 case BUILT_IN_CREALL:
3567 case BUILT_IN_CIMAG:
3568 case BUILT_IN_CIMAGF:
3569 case BUILT_IN_CIMAGL:
3570 /* expand_tree_builtin changes these into CONJ_EXPR, REALPART_EXPR
3571 and IMAGPART_EXPR. */
3580 /* Treat these like sqrt only if unsafe math optimizations are allowed,
3581 because of possible accuracy problems. */
3582 if (! flag_unsafe_math_optimizations)
3584 case BUILT_IN_FSQRT:
3585 case BUILT_IN_SQRTF:
3586 case BUILT_IN_SQRTL:
3587 target = expand_builtin_mathfn (exp, target, subtarget);
3595 case BUILT_IN_APPLY_ARGS:
3596 return expand_builtin_apply_args ();
3598 /* __builtin_apply (FUNCTION, ARGUMENTS, ARGSIZE) invokes
3599 FUNCTION with a copy of the parameters described by
3600 ARGUMENTS, and ARGSIZE. It returns a block of memory
3601 allocated on the stack into which is stored all the registers
3602 that might possibly be used for returning the result of a
3603 function. ARGUMENTS is the value returned by
3604 __builtin_apply_args. ARGSIZE is the number of bytes of
3605 arguments that must be copied. ??? How should this value be
3606 computed? We'll also need a safe worst case value for varargs
3608 case BUILT_IN_APPLY:
3609 if (!validate_arglist (arglist, POINTER_TYPE,
3610 POINTER_TYPE, INTEGER_TYPE, VOID_TYPE)
3611 && !validate_arglist (arglist, REFERENCE_TYPE,
3612 POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
3620 for (t = arglist, i = 0; t; t = TREE_CHAIN (t), i++)
3621 ops[i] = expand_expr (TREE_VALUE (t), NULL_RTX, VOIDmode, 0);
3623 return expand_builtin_apply (ops[0], ops[1], ops[2]);
3626 /* __builtin_return (RESULT) causes the function to return the
3627 value described by RESULT. RESULT is address of the block of
3628 memory returned by __builtin_apply. */
3629 case BUILT_IN_RETURN:
3630 if (validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
3631 expand_builtin_return (expand_expr (TREE_VALUE (arglist),
3632 NULL_RTX, VOIDmode, 0));
3635 case BUILT_IN_SAVEREGS:
3636 return expand_builtin_saveregs ();
3638 case BUILT_IN_ARGS_INFO:
3639 return expand_builtin_args_info (exp);
3641 /* Return the address of the first anonymous stack arg. */
3642 case BUILT_IN_NEXT_ARG:
3643 return expand_builtin_next_arg (arglist);
3645 case BUILT_IN_CLASSIFY_TYPE:
3646 return expand_builtin_classify_type (arglist);
3648 case BUILT_IN_CONSTANT_P:
3649 return expand_builtin_constant_p (exp);
3651 case BUILT_IN_FRAME_ADDRESS:
3652 case BUILT_IN_RETURN_ADDRESS:
3653 return expand_builtin_frame_address (exp);
3655 /* Returns the address of the area where the structure is returned.
3657 case BUILT_IN_AGGREGATE_INCOMING_ADDRESS:
3659 || ! AGGREGATE_TYPE_P (TREE_TYPE (TREE_TYPE (current_function_decl)))
3660 || GET_CODE (DECL_RTL (DECL_RESULT (current_function_decl))) != MEM)
3663 return XEXP (DECL_RTL (DECL_RESULT (current_function_decl)), 0);
3665 case BUILT_IN_ALLOCA:
3666 target = expand_builtin_alloca (arglist, target);
3672 target = expand_builtin_ffs (arglist, target, subtarget);
3677 case BUILT_IN_STRLEN:
3678 target = expand_builtin_strlen (exp, target);
3683 case BUILT_IN_STRCPY:
3684 target = expand_builtin_strcpy (exp);
3689 case BUILT_IN_STRNCPY:
3690 target = expand_builtin_strncpy (arglist, target, mode);
3695 case BUILT_IN_STRCAT:
3696 target = expand_builtin_strcat (arglist, target, mode);
3701 case BUILT_IN_STRNCAT:
3702 target = expand_builtin_strncat (arglist, target, mode);
3707 case BUILT_IN_STRSPN:
3708 target = expand_builtin_strspn (arglist, target, mode);
3713 case BUILT_IN_STRCSPN:
3714 target = expand_builtin_strcspn (arglist, target, mode);
3719 case BUILT_IN_STRSTR:
3720 target = expand_builtin_strstr (arglist, target, mode);
3725 case BUILT_IN_STRPBRK:
3726 target = expand_builtin_strpbrk (arglist, target, mode);
3731 case BUILT_IN_INDEX:
3732 case BUILT_IN_STRCHR:
3733 target = expand_builtin_strchr (arglist, target, mode);
3738 case BUILT_IN_RINDEX:
3739 case BUILT_IN_STRRCHR:
3740 target = expand_builtin_strrchr (arglist, target, mode);
3745 case BUILT_IN_MEMCPY:
3746 target = expand_builtin_memcpy (arglist);
3751 case BUILT_IN_MEMSET:
3752 target = expand_builtin_memset (exp);
3757 case BUILT_IN_BZERO:
3758 target = expand_builtin_bzero (exp);
3763 case BUILT_IN_STRCMP:
3764 target = expand_builtin_strcmp (exp, target, mode);
3769 case BUILT_IN_STRNCMP:
3770 target = expand_builtin_strncmp (exp, target, mode);
3775 /* These comparison functions need an instruction that returns an actual
3776 index. An ordinary compare that just sets the condition codes
3778 #ifdef HAVE_cmpstrsi
3780 case BUILT_IN_MEMCMP:
3781 target = expand_builtin_memcmp (exp, arglist, target);
3787 case BUILT_IN_MEMCMP:
3791 case BUILT_IN_SETJMP:
3792 target = expand_builtin_setjmp (arglist, target);
3797 /* __builtin_longjmp is passed a pointer to an array of five words.
3798 It's similar to the C library longjmp function but works with
3799 __builtin_setjmp above. */
3800 case BUILT_IN_LONGJMP:
3801 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
3805 rtx buf_addr = expand_expr (TREE_VALUE (arglist), subtarget,
3807 rtx value = expand_expr (TREE_VALUE (TREE_CHAIN (arglist)),
3808 NULL_RTX, VOIDmode, 0);
3810 if (value != const1_rtx)
3812 error ("__builtin_longjmp second argument must be 1");
3816 expand_builtin_longjmp (buf_addr, value);
3823 emit_insn (gen_trap ());
3826 error ("__builtin_trap not supported by this target");
3830 case BUILT_IN_PUTCHAR:
3832 case BUILT_IN_FPUTC:
3833 case BUILT_IN_FWRITE:
3835 case BUILT_IN_FPUTS:
3836 target = expand_builtin_fputs (arglist, ignore);
3841 /* Various hooks for the DWARF 2 __throw routine. */
3842 case BUILT_IN_UNWIND_INIT:
3843 expand_builtin_unwind_init ();
3845 case BUILT_IN_DWARF_CFA:
3846 return virtual_cfa_rtx;
3847 #ifdef DWARF2_UNWIND_INFO
3848 case BUILT_IN_DWARF_FP_REGNUM:
3849 return expand_builtin_dwarf_fp_regnum ();
3850 case BUILT_IN_INIT_DWARF_REG_SIZES:
3851 expand_builtin_init_dwarf_reg_sizes (TREE_VALUE (arglist));
3854 case BUILT_IN_FROB_RETURN_ADDR:
3855 return expand_builtin_frob_return_addr (TREE_VALUE (arglist));
3856 case BUILT_IN_EXTRACT_RETURN_ADDR:
3857 return expand_builtin_extract_return_addr (TREE_VALUE (arglist));
3858 case BUILT_IN_EH_RETURN:
3859 expand_builtin_eh_return (TREE_VALUE (arglist),
3860 TREE_VALUE (TREE_CHAIN (arglist)));
3862 #ifdef EH_RETURN_DATA_REGNO
3863 case BUILT_IN_EH_RETURN_DATA_REGNO:
3864 return expand_builtin_eh_return_data_regno (arglist);
3866 case BUILT_IN_VARARGS_START:
3867 return expand_builtin_va_start (0, arglist);
3868 case BUILT_IN_STDARG_START:
3869 return expand_builtin_va_start (1, arglist);
3870 case BUILT_IN_VA_END:
3871 return expand_builtin_va_end (arglist);
3872 case BUILT_IN_VA_COPY:
3873 return expand_builtin_va_copy (arglist);
3874 case BUILT_IN_EXPECT:
3875 return expand_builtin_expect (arglist, target);
3876 case BUILT_IN_PREFETCH:
3877 expand_builtin_prefetch (arglist);
3881 default: /* just do library call, if unknown builtin */
3882 error ("built-in function `%s' not currently supported",
3883 IDENTIFIER_POINTER (DECL_NAME (fndecl)));
3886 /* The switch statement above can drop through to cause the function
3887 to be called normally. */
3888 return expand_call (exp, target, ignore);
3891 /* Fold a call to __builtin_constant_p, if we know it will evaluate to a
3892 constant. ARGLIST is the argument list of the call. */
3895 fold_builtin_constant_p (arglist)
3901 arglist = TREE_VALUE (arglist);
3903 /* We return 1 for a numeric type that's known to be a constant
3904 value at compile-time or for an aggregate type that's a
3905 literal constant. */
3906 STRIP_NOPS (arglist);
3908 /* If we know this is a constant, emit the constant of one. */
3909 if (TREE_CODE_CLASS (TREE_CODE (arglist)) == 'c'
3910 || (TREE_CODE (arglist) == CONSTRUCTOR
3911 && TREE_CONSTANT (arglist))
3912 || (TREE_CODE (arglist) == ADDR_EXPR
3913 && TREE_CODE (TREE_OPERAND (arglist, 0)) == STRING_CST))
3914 return integer_one_node;
3916 /* If we aren't going to be running CSE or this expression
3917 has side effects, show we don't know it to be a constant.
3918 Likewise if it's a pointer or aggregate type since in those
3919 case we only want literals, since those are only optimized
3920 when generating RTL, not later.
3921 And finally, if we are compiling an initializer, not code, we
3922 need to return a definite result now; there's not going to be any
3923 more optimization done. */
3924 if (TREE_SIDE_EFFECTS (arglist) || cse_not_expected
3925 || AGGREGATE_TYPE_P (TREE_TYPE (arglist))
3926 || POINTER_TYPE_P (TREE_TYPE (arglist))
3928 return integer_zero_node;
3933 /* Fold a call to __builtin_classify_type. */
3936 fold_builtin_classify_type (arglist)
3940 return build_int_2 (no_type_class, 0);
3942 return build_int_2 (type_to_class (TREE_TYPE (TREE_VALUE (arglist))), 0);
3945 /* Used by constant folding to eliminate some builtin calls early. EXP is
3946 the CALL_EXPR of a call to a builtin function. */
3952 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
3953 tree arglist = TREE_OPERAND (exp, 1);
3954 enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
3956 if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_MD)
3961 case BUILT_IN_CONSTANT_P:
3962 return fold_builtin_constant_p (arglist);
3964 case BUILT_IN_CLASSIFY_TYPE:
3965 return fold_builtin_classify_type (arglist);
3967 case BUILT_IN_STRLEN:
3968 if (validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
3970 tree len = c_strlen (TREE_VALUE (arglist));
3984 build_function_call_expr (fn, arglist)
3989 call_expr = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (fn)), fn);
3990 call_expr = build (CALL_EXPR, TREE_TYPE (TREE_TYPE (fn)),
3991 call_expr, arglist);
3992 TREE_SIDE_EFFECTS (call_expr) = 1;
3993 return fold (call_expr);
3996 /* This function validates the types of a function call argument list
3997 represented as a tree chain of parameters against a specified list
3998 of tree_codes. If the last specifier is a 0, that represents an
3999 ellipses, otherwise the last specifier must be a VOID_TYPE. */
4002 validate_arglist VPARAMS ((tree arglist, ...))
4004 enum tree_code code;
4007 VA_OPEN (ap, arglist);
4008 VA_FIXEDARG (ap, tree, arglist);
4011 code = va_arg (ap, enum tree_code);
4015 /* This signifies an ellipses, any further arguments are all ok. */
4019 /* This signifies an endlink, if no arguments remain, return
4020 true, otherwise return false. */
4024 /* If no parameters remain or the parameter's code does not
4025 match the specified code, return false. Otherwise continue
4026 checking any remaining arguments. */
4027 if (arglist == 0 || code != TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))))
4031 arglist = TREE_CHAIN (arglist);
4034 /* We need gotos here since we can only have one VA_CLOSE in a
4042 /* Default version of target-specific builtin setup that does nothing. */
4045 default_init_builtins ()
4049 /* Default target-specific builtin expander that does nothing. */
4052 default_expand_builtin (exp, target, subtarget, mode, ignore)
4053 tree exp ATTRIBUTE_UNUSED;
4054 rtx target ATTRIBUTE_UNUSED;
4055 rtx subtarget ATTRIBUTE_UNUSED;
4056 enum machine_mode mode ATTRIBUTE_UNUSED;
4057 int ignore ATTRIBUTE_UNUSED;