1 /* Expand builtin functions.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002 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"
44 #include "langhooks.h"
46 #define CALLED_AS_BUILT_IN(NODE) \
47 (!strncmp (IDENTIFIER_POINTER (DECL_NAME (NODE)), "__builtin_", 10))
49 /* Register mappings for target machines without register windows. */
50 #ifndef INCOMING_REGNO
51 #define INCOMING_REGNO(OUT) (OUT)
53 #ifndef OUTGOING_REGNO
54 #define OUTGOING_REGNO(IN) (IN)
57 #ifndef PAD_VARARGS_DOWN
58 #define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
61 /* Define the names of the builtin function types and codes. */
62 const char *const built_in_class_names[4]
63 = {"NOT_BUILT_IN", "BUILT_IN_FRONTEND", "BUILT_IN_MD", "BUILT_IN_NORMAL"};
65 #define DEF_BUILTIN(X, N, C, T, LT, B, F, NA, AT) STRINGX(X),
66 const char *const built_in_names[(int) END_BUILTINS] =
68 #include "builtins.def"
72 /* Setup an array of _DECL trees, make sure each element is
73 initialized to NULL_TREE. */
74 tree built_in_decls[(int) END_BUILTINS];
76 static int get_pointer_alignment PARAMS ((tree, unsigned int));
77 static tree c_strlen PARAMS ((tree));
78 static const char *c_getstr PARAMS ((tree));
79 static rtx c_readstr PARAMS ((const char *,
81 static int target_char_cast PARAMS ((tree, char *));
82 static rtx get_memory_rtx PARAMS ((tree));
83 static int apply_args_size PARAMS ((void));
84 static int apply_result_size PARAMS ((void));
85 #if defined (HAVE_untyped_call) || defined (HAVE_untyped_return)
86 static rtx result_vector PARAMS ((int, rtx));
88 static rtx expand_builtin_setjmp PARAMS ((tree, rtx));
89 static void expand_builtin_prefetch PARAMS ((tree));
90 static rtx expand_builtin_apply_args PARAMS ((void));
91 static rtx expand_builtin_apply_args_1 PARAMS ((void));
92 static rtx expand_builtin_apply PARAMS ((rtx, rtx, rtx));
93 static void expand_builtin_return PARAMS ((rtx));
94 static enum type_class type_to_class PARAMS ((tree));
95 static rtx expand_builtin_classify_type PARAMS ((tree));
96 static rtx expand_builtin_mathfn PARAMS ((tree, rtx, rtx));
97 static rtx expand_builtin_constant_p PARAMS ((tree));
98 static rtx expand_builtin_args_info PARAMS ((tree));
99 static rtx expand_builtin_next_arg PARAMS ((tree));
100 static rtx expand_builtin_va_start PARAMS ((tree));
101 static rtx expand_builtin_va_end PARAMS ((tree));
102 static rtx expand_builtin_va_copy PARAMS ((tree));
103 static rtx expand_builtin_memcmp PARAMS ((tree, tree, rtx,
105 static rtx expand_builtin_strcmp PARAMS ((tree, rtx,
107 static rtx expand_builtin_strncmp PARAMS ((tree, rtx,
109 static rtx builtin_memcpy_read_str PARAMS ((PTR, HOST_WIDE_INT,
111 static rtx expand_builtin_strcat PARAMS ((tree, rtx,
113 static rtx expand_builtin_strncat PARAMS ((tree, rtx,
115 static rtx expand_builtin_strspn PARAMS ((tree, rtx,
117 static rtx expand_builtin_strcspn PARAMS ((tree, rtx,
119 static rtx expand_builtin_memcpy PARAMS ((tree, rtx,
121 static rtx expand_builtin_strcpy PARAMS ((tree, rtx,
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 builtin_memset_gen_str PARAMS ((PTR, HOST_WIDE_INT,
131 static rtx expand_builtin_memset PARAMS ((tree, rtx,
133 static rtx expand_builtin_bzero PARAMS ((tree));
134 static rtx expand_builtin_strlen PARAMS ((tree, rtx));
135 static rtx expand_builtin_strstr PARAMS ((tree, rtx,
137 static rtx expand_builtin_strpbrk PARAMS ((tree, rtx,
139 static rtx expand_builtin_strchr PARAMS ((tree, rtx,
141 static rtx expand_builtin_strrchr PARAMS ((tree, rtx,
143 static rtx expand_builtin_alloca PARAMS ((tree, rtx));
144 static rtx expand_builtin_ffs PARAMS ((tree, rtx, rtx));
145 static rtx expand_builtin_frame_address PARAMS ((tree));
146 static rtx expand_builtin_fputs PARAMS ((tree, int, int));
147 static tree stabilize_va_list PARAMS ((tree, int));
148 static rtx expand_builtin_expect PARAMS ((tree, rtx));
149 static tree fold_builtin_constant_p PARAMS ((tree));
150 static tree fold_builtin_classify_type PARAMS ((tree));
151 static tree build_function_call_expr PARAMS ((tree, tree));
152 static int validate_arglist PARAMS ((tree, ...));
154 /* Return the alignment in bits of EXP, a pointer valued expression.
155 But don't return more than MAX_ALIGN no matter what.
156 The alignment returned is, by default, the alignment of the thing that
157 EXP points to. If it is not a POINTER_TYPE, 0 is returned.
159 Otherwise, look at the expression to see if we can do better, i.e., if the
160 expression is actually pointing at an object whose alignment is tighter. */
163 get_pointer_alignment (exp, max_align)
165 unsigned int max_align;
167 unsigned int align, inner;
169 if (TREE_CODE (TREE_TYPE (exp)) != POINTER_TYPE)
172 align = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp)));
173 align = MIN (align, max_align);
177 switch (TREE_CODE (exp))
181 case NON_LVALUE_EXPR:
182 exp = TREE_OPERAND (exp, 0);
183 if (TREE_CODE (TREE_TYPE (exp)) != POINTER_TYPE)
186 inner = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp)));
187 align = MIN (inner, max_align);
191 /* If sum of pointer + int, restrict our maximum alignment to that
192 imposed by the integer. If not, we can't do any better than
194 if (! host_integerp (TREE_OPERAND (exp, 1), 1))
197 while (((tree_low_cst (TREE_OPERAND (exp, 1), 1))
198 & (max_align / BITS_PER_UNIT - 1))
202 exp = TREE_OPERAND (exp, 0);
206 /* See what we are pointing at and look at its alignment. */
207 exp = TREE_OPERAND (exp, 0);
208 if (TREE_CODE (exp) == FUNCTION_DECL)
209 align = FUNCTION_BOUNDARY;
210 else if (DECL_P (exp))
211 align = DECL_ALIGN (exp);
212 #ifdef CONSTANT_ALIGNMENT
213 else if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'c')
214 align = CONSTANT_ALIGNMENT (exp, align);
216 return MIN (align, max_align);
224 /* Compute the length of a C string. TREE_STRING_LENGTH is not the right
225 way, because it could contain a zero byte in the middle.
226 TREE_STRING_LENGTH is the size of the character array, not the string.
228 The value returned is of type `ssizetype'.
230 Unfortunately, string_constant can't access the values of const char
231 arrays with initializers, so neither can we do so here. */
238 HOST_WIDE_INT offset;
242 src = string_constant (src, &offset_node);
246 max = TREE_STRING_LENGTH (src) - 1;
247 ptr = TREE_STRING_POINTER (src);
249 if (offset_node && TREE_CODE (offset_node) != INTEGER_CST)
251 /* If the string has an internal zero byte (e.g., "foo\0bar"), we can't
252 compute the offset to the following null if we don't know where to
253 start searching for it. */
256 for (i = 0; i < max; i++)
260 /* We don't know the starting offset, but we do know that the string
261 has no internal zero bytes. We can assume that the offset falls
262 within the bounds of the string; otherwise, the programmer deserves
263 what he gets. Subtract the offset from the length of the string,
264 and return that. This would perhaps not be valid if we were dealing
265 with named arrays in addition to literal string constants. */
267 return size_diffop (size_int (max), offset_node);
270 /* We have a known offset into the string. Start searching there for
271 a null character if we can represent it as a single HOST_WIDE_INT. */
272 if (offset_node == 0)
274 else if (! host_integerp (offset_node, 0))
277 offset = tree_low_cst (offset_node, 0);
279 /* If the offset is known to be out of bounds, warn, and call strlen at
281 if (offset < 0 || offset > max)
283 warning ("offset outside bounds of constant string");
287 /* Use strlen to search for the first zero byte. Since any strings
288 constructed with build_string will have nulls appended, we win even
289 if we get handed something like (char[4])"abcd".
291 Since OFFSET is our starting index into the string, no further
292 calculation is needed. */
293 return ssize_int (strlen (ptr + offset));
296 /* Return a char pointer for a C string if it is a string constant
297 or sum of string constant and integer constant. */
305 src = string_constant (src, &offset_node);
309 if (offset_node == 0)
310 return TREE_STRING_POINTER (src);
311 else if (!host_integerp (offset_node, 1)
312 || compare_tree_int (offset_node, TREE_STRING_LENGTH (src) - 1) > 0)
315 return TREE_STRING_POINTER (src) + tree_low_cst (offset_node, 1);
318 /* Return a CONST_INT or CONST_DOUBLE corresponding to target reading
319 GET_MODE_BITSIZE (MODE) bits from string constant STR. */
322 c_readstr (str, mode)
324 enum machine_mode mode;
330 if (GET_MODE_CLASS (mode) != MODE_INT)
335 for (i = 0; i < GET_MODE_SIZE (mode); i++)
338 if (WORDS_BIG_ENDIAN)
339 j = GET_MODE_SIZE (mode) - i - 1;
340 if (BYTES_BIG_ENDIAN != WORDS_BIG_ENDIAN
341 && GET_MODE_SIZE (mode) > UNITS_PER_WORD)
342 j = j + UNITS_PER_WORD - 2 * (j % UNITS_PER_WORD) - 1;
344 if (j > 2 * HOST_BITS_PER_WIDE_INT)
347 ch = (unsigned char) str[i];
348 c[j / HOST_BITS_PER_WIDE_INT] |= ch << (j % HOST_BITS_PER_WIDE_INT);
350 return immed_double_const (c[0], c[1], mode);
353 /* Cast a target constant CST to target CHAR and if that value fits into
354 host char type, return zero and put that value into variable pointed by
358 target_char_cast (cst, p)
362 unsigned HOST_WIDE_INT val, hostval;
364 if (!host_integerp (cst, 1)
365 || CHAR_TYPE_SIZE > HOST_BITS_PER_WIDE_INT)
368 val = tree_low_cst (cst, 1);
369 if (CHAR_TYPE_SIZE < HOST_BITS_PER_WIDE_INT)
370 val &= (((unsigned HOST_WIDE_INT) 1) << CHAR_TYPE_SIZE) - 1;
373 if (HOST_BITS_PER_CHAR < HOST_BITS_PER_WIDE_INT)
374 hostval &= (((unsigned HOST_WIDE_INT) 1) << HOST_BITS_PER_CHAR) - 1;
383 /* Given TEM, a pointer to a stack frame, follow the dynamic chain COUNT
384 times to get the address of either a higher stack frame, or a return
385 address located within it (depending on FNDECL_CODE). */
388 expand_builtin_return_addr (fndecl_code, count, tem)
389 enum built_in_function fndecl_code;
395 /* Some machines need special handling before we can access
396 arbitrary frames. For example, on the sparc, we must first flush
397 all register windows to the stack. */
398 #ifdef SETUP_FRAME_ADDRESSES
400 SETUP_FRAME_ADDRESSES ();
403 /* On the sparc, the return address is not in the frame, it is in a
404 register. There is no way to access it off of the current frame
405 pointer, but it can be accessed off the previous frame pointer by
406 reading the value from the register window save area. */
407 #ifdef RETURN_ADDR_IN_PREVIOUS_FRAME
408 if (fndecl_code == BUILT_IN_RETURN_ADDRESS)
412 /* Scan back COUNT frames to the specified frame. */
413 for (i = 0; i < count; i++)
415 /* Assume the dynamic chain pointer is in the word that the
416 frame address points to, unless otherwise specified. */
417 #ifdef DYNAMIC_CHAIN_ADDRESS
418 tem = DYNAMIC_CHAIN_ADDRESS (tem);
420 tem = memory_address (Pmode, tem);
421 tem = gen_rtx_MEM (Pmode, tem);
422 set_mem_alias_set (tem, get_frame_alias_set ());
423 tem = copy_to_reg (tem);
426 /* For __builtin_frame_address, return what we've got. */
427 if (fndecl_code == BUILT_IN_FRAME_ADDRESS)
430 /* For __builtin_return_address, Get the return address from that
432 #ifdef RETURN_ADDR_RTX
433 tem = RETURN_ADDR_RTX (count, tem);
435 tem = memory_address (Pmode,
436 plus_constant (tem, GET_MODE_SIZE (Pmode)));
437 tem = gen_rtx_MEM (Pmode, tem);
438 set_mem_alias_set (tem, get_frame_alias_set ());
443 /* Alias set used for setjmp buffer. */
444 static HOST_WIDE_INT setjmp_alias_set = -1;
446 /* Construct the leading half of a __builtin_setjmp call. Control will
447 return to RECEIVER_LABEL. This is used directly by sjlj exception
451 expand_builtin_setjmp_setup (buf_addr, receiver_label)
455 enum machine_mode sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL);
459 if (setjmp_alias_set == -1)
460 setjmp_alias_set = new_alias_set ();
462 #ifdef POINTERS_EXTEND_UNSIGNED
463 if (GET_MODE (buf_addr) != Pmode)
464 buf_addr = convert_memory_address (Pmode, buf_addr);
467 buf_addr = force_reg (Pmode, force_operand (buf_addr, NULL_RTX));
471 /* We store the frame pointer and the address of receiver_label in
472 the buffer and use the rest of it for the stack save area, which
473 is machine-dependent. */
475 #ifndef BUILTIN_SETJMP_FRAME_VALUE
476 #define BUILTIN_SETJMP_FRAME_VALUE virtual_stack_vars_rtx
479 mem = gen_rtx_MEM (Pmode, buf_addr);
480 set_mem_alias_set (mem, setjmp_alias_set);
481 emit_move_insn (mem, BUILTIN_SETJMP_FRAME_VALUE);
483 mem = gen_rtx_MEM (Pmode, plus_constant (buf_addr, GET_MODE_SIZE (Pmode))),
484 set_mem_alias_set (mem, setjmp_alias_set);
486 emit_move_insn (validize_mem (mem),
487 force_reg (Pmode, gen_rtx_LABEL_REF (Pmode, receiver_label)));
489 stack_save = gen_rtx_MEM (sa_mode,
490 plus_constant (buf_addr,
491 2 * GET_MODE_SIZE (Pmode)));
492 set_mem_alias_set (stack_save, setjmp_alias_set);
493 emit_stack_save (SAVE_NONLOCAL, &stack_save, NULL_RTX);
495 /* If there is further processing to do, do it. */
496 #ifdef HAVE_builtin_setjmp_setup
497 if (HAVE_builtin_setjmp_setup)
498 emit_insn (gen_builtin_setjmp_setup (buf_addr));
501 /* Tell optimize_save_area_alloca that extra work is going to
502 need to go on during alloca. */
503 current_function_calls_setjmp = 1;
505 /* Set this so all the registers get saved in our frame; we need to be
506 able to copy the saved values for any registers from frames we unwind. */
507 current_function_has_nonlocal_label = 1;
510 /* Construct the trailing part of a __builtin_setjmp call.
511 This is used directly by sjlj exception handling code. */
514 expand_builtin_setjmp_receiver (receiver_label)
515 rtx receiver_label ATTRIBUTE_UNUSED;
517 /* Clobber the FP when we get here, so we have to make sure it's
518 marked as used by this function. */
519 emit_insn (gen_rtx_USE (VOIDmode, hard_frame_pointer_rtx));
521 /* Mark the static chain as clobbered here so life information
522 doesn't get messed up for it. */
523 emit_insn (gen_rtx_CLOBBER (VOIDmode, static_chain_rtx));
525 /* Now put in the code to restore the frame pointer, and argument
526 pointer, if needed. The code below is from expand_end_bindings
527 in stmt.c; see detailed documentation there. */
528 #ifdef HAVE_nonlocal_goto
529 if (! HAVE_nonlocal_goto)
531 emit_move_insn (virtual_stack_vars_rtx, hard_frame_pointer_rtx);
533 #if ARG_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM
534 if (fixed_regs[ARG_POINTER_REGNUM])
536 #ifdef ELIMINABLE_REGS
538 static const struct elims {const int from, to;} elim_regs[] = ELIMINABLE_REGS;
540 for (i = 0; i < ARRAY_SIZE (elim_regs); i++)
541 if (elim_regs[i].from == ARG_POINTER_REGNUM
542 && elim_regs[i].to == HARD_FRAME_POINTER_REGNUM)
545 if (i == ARRAY_SIZE (elim_regs))
548 /* Now restore our arg pointer from the address at which it
549 was saved in our stack frame. */
550 emit_move_insn (virtual_incoming_args_rtx,
551 copy_to_reg (get_arg_pointer_save_area (cfun)));
556 #ifdef HAVE_builtin_setjmp_receiver
557 if (HAVE_builtin_setjmp_receiver)
558 emit_insn (gen_builtin_setjmp_receiver (receiver_label));
561 #ifdef HAVE_nonlocal_goto_receiver
562 if (HAVE_nonlocal_goto_receiver)
563 emit_insn (gen_nonlocal_goto_receiver ());
568 /* @@@ This is a kludge. Not all machine descriptions define a blockage
569 insn, but we must not allow the code we just generated to be reordered
570 by scheduling. Specifically, the update of the frame pointer must
571 happen immediately, not later. So emit an ASM_INPUT to act as blockage
573 emit_insn (gen_rtx_ASM_INPUT (VOIDmode, ""));
576 /* __builtin_setjmp is passed a pointer to an array of five words (not
577 all will be used on all machines). It operates similarly to the C
578 library function of the same name, but is more efficient. Much of
579 the code below (and for longjmp) is copied from the handling of
582 NOTE: This is intended for use by GNAT and the exception handling
583 scheme in the compiler and will only work in the method used by
587 expand_builtin_setjmp (arglist, target)
591 rtx buf_addr, next_lab, cont_lab;
593 if (!validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
596 if (target == 0 || GET_CODE (target) != REG
597 || REGNO (target) < FIRST_PSEUDO_REGISTER)
598 target = gen_reg_rtx (TYPE_MODE (integer_type_node));
600 buf_addr = expand_expr (TREE_VALUE (arglist), NULL_RTX, VOIDmode, 0);
602 next_lab = gen_label_rtx ();
603 cont_lab = gen_label_rtx ();
605 expand_builtin_setjmp_setup (buf_addr, next_lab);
607 /* Set TARGET to zero and branch to the continue label. */
608 emit_move_insn (target, const0_rtx);
609 emit_jump_insn (gen_jump (cont_lab));
611 emit_label (next_lab);
613 expand_builtin_setjmp_receiver (next_lab);
615 /* Set TARGET to one. */
616 emit_move_insn (target, const1_rtx);
617 emit_label (cont_lab);
619 /* Tell flow about the strange goings on. Putting `next_lab' on
620 `nonlocal_goto_handler_labels' to indicates that function
621 calls may traverse the arc back to this label. */
623 current_function_has_nonlocal_label = 1;
624 nonlocal_goto_handler_labels
625 = gen_rtx_EXPR_LIST (VOIDmode, next_lab, nonlocal_goto_handler_labels);
630 /* __builtin_longjmp is passed a pointer to an array of five words (not
631 all will be used on all machines). It operates similarly to the C
632 library function of the same name, but is more efficient. Much of
633 the code below is copied from the handling of non-local gotos.
635 NOTE: This is intended for use by GNAT and the exception handling
636 scheme in the compiler and will only work in the method used by
640 expand_builtin_longjmp (buf_addr, value)
643 rtx fp, lab, stack, insn, last;
644 enum machine_mode sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL);
646 if (setjmp_alias_set == -1)
647 setjmp_alias_set = new_alias_set ();
649 #ifdef POINTERS_EXTEND_UNSIGNED
650 if (GET_MODE (buf_addr) != Pmode)
651 buf_addr = convert_memory_address (Pmode, buf_addr);
654 buf_addr = force_reg (Pmode, buf_addr);
656 /* We used to store value in static_chain_rtx, but that fails if pointers
657 are smaller than integers. We instead require that the user must pass
658 a second argument of 1, because that is what builtin_setjmp will
659 return. This also makes EH slightly more efficient, since we are no
660 longer copying around a value that we don't care about. */
661 if (value != const1_rtx)
664 current_function_calls_longjmp = 1;
666 last = get_last_insn ();
667 #ifdef HAVE_builtin_longjmp
668 if (HAVE_builtin_longjmp)
669 emit_insn (gen_builtin_longjmp (buf_addr));
673 fp = gen_rtx_MEM (Pmode, buf_addr);
674 lab = gen_rtx_MEM (Pmode, plus_constant (buf_addr,
675 GET_MODE_SIZE (Pmode)));
677 stack = gen_rtx_MEM (sa_mode, plus_constant (buf_addr,
678 2 * GET_MODE_SIZE (Pmode)));
679 set_mem_alias_set (fp, setjmp_alias_set);
680 set_mem_alias_set (lab, setjmp_alias_set);
681 set_mem_alias_set (stack, setjmp_alias_set);
683 /* Pick up FP, label, and SP from the block and jump. This code is
684 from expand_goto in stmt.c; see there for detailed comments. */
685 #if HAVE_nonlocal_goto
686 if (HAVE_nonlocal_goto)
687 /* We have to pass a value to the nonlocal_goto pattern that will
688 get copied into the static_chain pointer, but it does not matter
689 what that value is, because builtin_setjmp does not use it. */
690 emit_insn (gen_nonlocal_goto (value, lab, stack, fp));
694 lab = copy_to_reg (lab);
696 emit_move_insn (hard_frame_pointer_rtx, fp);
697 emit_stack_restore (SAVE_NONLOCAL, stack, NULL_RTX);
699 emit_insn (gen_rtx_USE (VOIDmode, hard_frame_pointer_rtx));
700 emit_insn (gen_rtx_USE (VOIDmode, stack_pointer_rtx));
701 emit_indirect_jump (lab);
705 /* Search backwards and mark the jump insn as a non-local goto.
706 Note that this precludes the use of __builtin_longjmp to a
707 __builtin_setjmp target in the same function. However, we've
708 already cautioned the user that these functions are for
709 internal exception handling use only. */
710 for (insn = get_last_insn (); insn; insn = PREV_INSN (insn))
714 if (GET_CODE (insn) == JUMP_INSN)
716 REG_NOTES (insn) = alloc_EXPR_LIST (REG_NON_LOCAL_GOTO, const0_rtx,
720 else if (GET_CODE (insn) == CALL_INSN)
725 /* Expand a call to __builtin_prefetch. For a target that does not support
726 data prefetch, evaluate the memory address argument in case it has side
730 expand_builtin_prefetch (arglist)
733 tree arg0, arg1, arg2;
736 if (!validate_arglist (arglist, POINTER_TYPE, 0))
739 arg0 = TREE_VALUE (arglist);
740 /* Arguments 1 and 2 are optional; argument 1 (read/write) defaults to
741 zero (read) and argument 2 (locality) defaults to 3 (high degree of
743 if (TREE_CHAIN (arglist))
745 arg1 = TREE_VALUE (TREE_CHAIN (arglist));
746 if (TREE_CHAIN (TREE_CHAIN (arglist)))
747 arg2 = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
749 arg2 = build_int_2 (3, 0);
753 arg1 = integer_zero_node;
754 arg2 = build_int_2 (3, 0);
757 /* Argument 0 is an address. */
758 op0 = expand_expr (arg0, NULL_RTX, Pmode, EXPAND_NORMAL);
760 /* Argument 1 (read/write flag) must be a compile-time constant int. */
761 if (TREE_CODE (arg1) != INTEGER_CST)
763 error ("second arg to `__builtin_prefetch' must be a constant");
764 arg1 = integer_zero_node;
766 op1 = expand_expr (arg1, NULL_RTX, VOIDmode, 0);
767 /* Argument 1 must be either zero or one. */
768 if (INTVAL (op1) != 0 && INTVAL (op1) != 1)
770 warning ("invalid second arg to __builtin_prefetch; using zero");
774 /* Argument 2 (locality) must be a compile-time constant int. */
775 if (TREE_CODE (arg2) != INTEGER_CST)
777 error ("third arg to `__builtin_prefetch' must be a constant");
778 arg2 = integer_zero_node;
780 op2 = expand_expr (arg2, NULL_RTX, VOIDmode, 0);
781 /* Argument 2 must be 0, 1, 2, or 3. */
782 if (INTVAL (op2) < 0 || INTVAL (op2) > 3)
784 warning ("invalid third arg to __builtin_prefetch; using zero");
791 if ((! (*insn_data[(int)CODE_FOR_prefetch].operand[0].predicate)
793 insn_data[(int)CODE_FOR_prefetch].operand[0].mode)) ||
794 (GET_MODE(op0) != Pmode))
796 #ifdef POINTERS_EXTEND_UNSIGNED
797 if (GET_MODE(op0) != Pmode)
798 op0 = convert_memory_address (Pmode, op0);
800 op0 = force_reg (Pmode, op0);
802 emit_insn (gen_prefetch (op0, op1, op2));
806 op0 = protect_from_queue (op0, 0);
807 /* Don't do anything with direct references to volatile memory, but
808 generate code to handle other side effects. */
809 if (GET_CODE (op0) != MEM && side_effects_p (op0))
813 /* Get a MEM rtx for expression EXP which is the address of an operand
814 to be used to be used in a string instruction (cmpstrsi, movstrsi, ..). */
820 rtx addr = expand_expr (exp, NULL_RTX, ptr_mode, EXPAND_SUM);
823 #ifdef POINTERS_EXTEND_UNSIGNED
824 if (GET_MODE (addr) != Pmode)
825 addr = convert_memory_address (Pmode, addr);
828 mem = gen_rtx_MEM (BLKmode, memory_address (BLKmode, addr));
830 /* Get an expression we can use to find the attributes to assign to MEM.
831 If it is an ADDR_EXPR, use the operand. Otherwise, dereference it if
832 we can. First remove any nops. */
833 while ((TREE_CODE (exp) == NOP_EXPR || TREE_CODE (exp) == CONVERT_EXPR
834 || TREE_CODE (exp) == NON_LVALUE_EXPR)
835 && POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (exp, 0))))
836 exp = TREE_OPERAND (exp, 0);
838 if (TREE_CODE (exp) == ADDR_EXPR)
840 exp = TREE_OPERAND (exp, 0);
841 set_mem_attributes (mem, exp, 0);
843 else if (POINTER_TYPE_P (TREE_TYPE (exp)))
845 exp = build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (exp)), exp);
846 /* memcpy, memset and other builtin stringops can alias with anything. */
847 set_mem_alias_set (mem, 0);
853 /* Built-in functions to perform an untyped call and return. */
855 /* For each register that may be used for calling a function, this
856 gives a mode used to copy the register's value. VOIDmode indicates
857 the register is not used for calling a function. If the machine
858 has register windows, this gives only the outbound registers.
859 INCOMING_REGNO gives the corresponding inbound register. */
860 static enum machine_mode apply_args_mode[FIRST_PSEUDO_REGISTER];
862 /* For each register that may be used for returning values, this gives
863 a mode used to copy the register's value. VOIDmode indicates the
864 register is not used for returning values. If the machine has
865 register windows, this gives only the outbound registers.
866 INCOMING_REGNO gives the corresponding inbound register. */
867 static enum machine_mode apply_result_mode[FIRST_PSEUDO_REGISTER];
869 /* For each register that may be used for calling a function, this
870 gives the offset of that register into the block returned by
871 __builtin_apply_args. 0 indicates that the register is not
872 used for calling a function. */
873 static int apply_args_reg_offset[FIRST_PSEUDO_REGISTER];
875 /* Return the offset of register REGNO into the block returned by
876 __builtin_apply_args. This is not declared static, since it is
877 needed in objc-act.c. */
880 apply_args_register_offset (regno)
885 /* Arguments are always put in outgoing registers (in the argument
886 block) if such make sense. */
887 #ifdef OUTGOING_REGNO
888 regno = OUTGOING_REGNO(regno);
890 return apply_args_reg_offset[regno];
893 /* Return the size required for the block returned by __builtin_apply_args,
894 and initialize apply_args_mode. */
899 static int size = -1;
902 enum machine_mode mode;
904 /* The values computed by this function never change. */
907 /* The first value is the incoming arg-pointer. */
908 size = GET_MODE_SIZE (Pmode);
910 /* The second value is the structure value address unless this is
911 passed as an "invisible" first argument. */
912 if (struct_value_rtx)
913 size += GET_MODE_SIZE (Pmode);
915 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
916 if (FUNCTION_ARG_REGNO_P (regno))
918 /* Search for the proper mode for copying this register's
919 value. I'm not sure this is right, but it works so far. */
920 enum machine_mode best_mode = VOIDmode;
922 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
924 mode = GET_MODE_WIDER_MODE (mode))
925 if (HARD_REGNO_MODE_OK (regno, mode)
926 && HARD_REGNO_NREGS (regno, mode) == 1)
929 if (best_mode == VOIDmode)
930 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
932 mode = GET_MODE_WIDER_MODE (mode))
933 if (HARD_REGNO_MODE_OK (regno, mode)
934 && have_insn_for (SET, mode))
937 if (best_mode == VOIDmode)
938 for (mode = GET_CLASS_NARROWEST_MODE (MODE_VECTOR_FLOAT);
940 mode = GET_MODE_WIDER_MODE (mode))
941 if (HARD_REGNO_MODE_OK (regno, mode)
942 && have_insn_for (SET, mode))
945 if (best_mode == VOIDmode)
946 for (mode = GET_CLASS_NARROWEST_MODE (MODE_VECTOR_INT);
948 mode = GET_MODE_WIDER_MODE (mode))
949 if (HARD_REGNO_MODE_OK (regno, mode)
950 && have_insn_for (SET, mode))
954 if (mode == VOIDmode)
957 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
958 if (size % align != 0)
959 size = CEIL (size, align) * align;
960 apply_args_reg_offset[regno] = size;
961 size += GET_MODE_SIZE (mode);
962 apply_args_mode[regno] = mode;
966 apply_args_mode[regno] = VOIDmode;
967 apply_args_reg_offset[regno] = 0;
973 /* Return the size required for the block returned by __builtin_apply,
974 and initialize apply_result_mode. */
979 static int size = -1;
981 enum machine_mode mode;
983 /* The values computed by this function never change. */
988 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
989 if (FUNCTION_VALUE_REGNO_P (regno))
991 /* Search for the proper mode for copying this register's
992 value. I'm not sure this is right, but it works so far. */
993 enum machine_mode best_mode = VOIDmode;
995 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
997 mode = GET_MODE_WIDER_MODE (mode))
998 if (HARD_REGNO_MODE_OK (regno, mode))
1001 if (best_mode == VOIDmode)
1002 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
1004 mode = GET_MODE_WIDER_MODE (mode))
1005 if (HARD_REGNO_MODE_OK (regno, mode)
1006 && have_insn_for (SET, mode))
1009 if (best_mode == VOIDmode)
1010 for (mode = GET_CLASS_NARROWEST_MODE (MODE_VECTOR_FLOAT);
1012 mode = GET_MODE_WIDER_MODE (mode))
1013 if (HARD_REGNO_MODE_OK (regno, mode)
1014 && have_insn_for (SET, mode))
1017 if (best_mode == VOIDmode)
1018 for (mode = GET_CLASS_NARROWEST_MODE (MODE_VECTOR_INT);
1020 mode = GET_MODE_WIDER_MODE (mode))
1021 if (HARD_REGNO_MODE_OK (regno, mode)
1022 && have_insn_for (SET, mode))
1026 if (mode == VOIDmode)
1029 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
1030 if (size % align != 0)
1031 size = CEIL (size, align) * align;
1032 size += GET_MODE_SIZE (mode);
1033 apply_result_mode[regno] = mode;
1036 apply_result_mode[regno] = VOIDmode;
1038 /* Allow targets that use untyped_call and untyped_return to override
1039 the size so that machine-specific information can be stored here. */
1040 #ifdef APPLY_RESULT_SIZE
1041 size = APPLY_RESULT_SIZE;
1047 #if defined (HAVE_untyped_call) || defined (HAVE_untyped_return)
1048 /* Create a vector describing the result block RESULT. If SAVEP is true,
1049 the result block is used to save the values; otherwise it is used to
1050 restore the values. */
1053 result_vector (savep, result)
1057 int regno, size, align, nelts;
1058 enum machine_mode mode;
1060 rtx *savevec = (rtx *) alloca (FIRST_PSEUDO_REGISTER * sizeof (rtx));
1063 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1064 if ((mode = apply_result_mode[regno]) != VOIDmode)
1066 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
1067 if (size % align != 0)
1068 size = CEIL (size, align) * align;
1069 reg = gen_rtx_REG (mode, savep ? regno : INCOMING_REGNO (regno));
1070 mem = adjust_address (result, mode, size);
1071 savevec[nelts++] = (savep
1072 ? gen_rtx_SET (VOIDmode, mem, reg)
1073 : gen_rtx_SET (VOIDmode, reg, mem));
1074 size += GET_MODE_SIZE (mode);
1076 return gen_rtx_PARALLEL (VOIDmode, gen_rtvec_v (nelts, savevec));
1078 #endif /* HAVE_untyped_call or HAVE_untyped_return */
1080 /* Save the state required to perform an untyped call with the same
1081 arguments as were passed to the current function. */
1084 expand_builtin_apply_args_1 ()
1087 int size, align, regno;
1088 enum machine_mode mode;
1090 /* Create a block where the arg-pointer, structure value address,
1091 and argument registers can be saved. */
1092 registers = assign_stack_local (BLKmode, apply_args_size (), -1);
1094 /* Walk past the arg-pointer and structure value address. */
1095 size = GET_MODE_SIZE (Pmode);
1096 if (struct_value_rtx)
1097 size += GET_MODE_SIZE (Pmode);
1099 /* Save each register used in calling a function to the block. */
1100 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1101 if ((mode = apply_args_mode[regno]) != VOIDmode)
1105 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
1106 if (size % align != 0)
1107 size = CEIL (size, align) * align;
1109 tem = gen_rtx_REG (mode, INCOMING_REGNO (regno));
1111 emit_move_insn (adjust_address (registers, mode, size), tem);
1112 size += GET_MODE_SIZE (mode);
1115 /* Save the arg pointer to the block. */
1116 emit_move_insn (adjust_address (registers, Pmode, 0),
1117 copy_to_reg (virtual_incoming_args_rtx));
1118 size = GET_MODE_SIZE (Pmode);
1120 /* Save the structure value address unless this is passed as an
1121 "invisible" first argument. */
1122 if (struct_value_incoming_rtx)
1124 emit_move_insn (adjust_address (registers, Pmode, size),
1125 copy_to_reg (struct_value_incoming_rtx));
1126 size += GET_MODE_SIZE (Pmode);
1129 /* Return the address of the block. */
1130 return copy_addr_to_reg (XEXP (registers, 0));
1133 /* __builtin_apply_args returns block of memory allocated on
1134 the stack into which is stored the arg pointer, structure
1135 value address, static chain, and all the registers that might
1136 possibly be used in performing a function call. The code is
1137 moved to the start of the function so the incoming values are
1141 expand_builtin_apply_args ()
1143 /* Don't do __builtin_apply_args more than once in a function.
1144 Save the result of the first call and reuse it. */
1145 if (apply_args_value != 0)
1146 return apply_args_value;
1148 /* When this function is called, it means that registers must be
1149 saved on entry to this function. So we migrate the
1150 call to the first insn of this function. */
1155 temp = expand_builtin_apply_args_1 ();
1159 apply_args_value = temp;
1161 /* Put the insns after the NOTE that starts the function.
1162 If this is inside a start_sequence, make the outer-level insn
1163 chain current, so the code is placed at the start of the
1165 push_topmost_sequence ();
1166 emit_insn_before (seq, NEXT_INSN (get_insns ()));
1167 pop_topmost_sequence ();
1172 /* Perform an untyped call and save the state required to perform an
1173 untyped return of whatever value was returned by the given function. */
1176 expand_builtin_apply (function, arguments, argsize)
1177 rtx function, arguments, argsize;
1179 int size, align, regno;
1180 enum machine_mode mode;
1181 rtx incoming_args, result, reg, dest, src, call_insn;
1182 rtx old_stack_level = 0;
1183 rtx call_fusage = 0;
1185 #ifdef POINTERS_EXTEND_UNSIGNED
1186 if (GET_MODE (arguments) != Pmode)
1187 arguments = convert_memory_address (Pmode, arguments);
1190 /* Create a block where the return registers can be saved. */
1191 result = assign_stack_local (BLKmode, apply_result_size (), -1);
1193 /* Fetch the arg pointer from the ARGUMENTS block. */
1194 incoming_args = gen_reg_rtx (Pmode);
1195 emit_move_insn (incoming_args, gen_rtx_MEM (Pmode, arguments));
1196 #ifndef STACK_GROWS_DOWNWARD
1197 incoming_args = expand_simple_binop (Pmode, MINUS, incoming_args, argsize,
1198 incoming_args, 0, OPTAB_LIB_WIDEN);
1201 /* Perform postincrements before actually calling the function. */
1204 /* Push a new argument block and copy the arguments. Do not allow
1205 the (potential) memcpy call below to interfere with our stack
1207 do_pending_stack_adjust ();
1210 /* Save the stack with nonlocal if available */
1211 #ifdef HAVE_save_stack_nonlocal
1212 if (HAVE_save_stack_nonlocal)
1213 emit_stack_save (SAVE_NONLOCAL, &old_stack_level, NULL_RTX);
1216 emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX);
1218 /* Push a block of memory onto the stack to store the memory arguments.
1219 Save the address in a register, and copy the memory arguments. ??? I
1220 haven't figured out how the calling convention macros effect this,
1221 but it's likely that the source and/or destination addresses in
1222 the block copy will need updating in machine specific ways. */
1223 dest = allocate_dynamic_stack_space (argsize, 0, BITS_PER_UNIT);
1224 dest = gen_rtx_MEM (BLKmode, dest);
1225 set_mem_align (dest, PARM_BOUNDARY);
1226 src = gen_rtx_MEM (BLKmode, incoming_args);
1227 set_mem_align (src, PARM_BOUNDARY);
1228 emit_block_move (dest, src, argsize, BLOCK_OP_NORMAL);
1230 /* Refer to the argument block. */
1232 arguments = gen_rtx_MEM (BLKmode, arguments);
1233 set_mem_align (arguments, PARM_BOUNDARY);
1235 /* Walk past the arg-pointer and structure value address. */
1236 size = GET_MODE_SIZE (Pmode);
1237 if (struct_value_rtx)
1238 size += GET_MODE_SIZE (Pmode);
1240 /* Restore each of the registers previously saved. Make USE insns
1241 for each of these registers for use in making the call. */
1242 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1243 if ((mode = apply_args_mode[regno]) != VOIDmode)
1245 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
1246 if (size % align != 0)
1247 size = CEIL (size, align) * align;
1248 reg = gen_rtx_REG (mode, regno);
1249 emit_move_insn (reg, adjust_address (arguments, mode, size));
1250 use_reg (&call_fusage, reg);
1251 size += GET_MODE_SIZE (mode);
1254 /* Restore the structure value address unless this is passed as an
1255 "invisible" first argument. */
1256 size = GET_MODE_SIZE (Pmode);
1257 if (struct_value_rtx)
1259 rtx value = gen_reg_rtx (Pmode);
1260 emit_move_insn (value, adjust_address (arguments, Pmode, size));
1261 emit_move_insn (struct_value_rtx, value);
1262 if (GET_CODE (struct_value_rtx) == REG)
1263 use_reg (&call_fusage, struct_value_rtx);
1264 size += GET_MODE_SIZE (Pmode);
1267 /* All arguments and registers used for the call are set up by now! */
1268 function = prepare_call_address (function, NULL_TREE, &call_fusage, 0, 0);
1270 /* Ensure address is valid. SYMBOL_REF is already valid, so no need,
1271 and we don't want to load it into a register as an optimization,
1272 because prepare_call_address already did it if it should be done. */
1273 if (GET_CODE (function) != SYMBOL_REF)
1274 function = memory_address (FUNCTION_MODE, function);
1276 /* Generate the actual call instruction and save the return value. */
1277 #ifdef HAVE_untyped_call
1278 if (HAVE_untyped_call)
1279 emit_call_insn (gen_untyped_call (gen_rtx_MEM (FUNCTION_MODE, function),
1280 result, result_vector (1, result)));
1283 #ifdef HAVE_call_value
1284 if (HAVE_call_value)
1288 /* Locate the unique return register. It is not possible to
1289 express a call that sets more than one return register using
1290 call_value; use untyped_call for that. In fact, untyped_call
1291 only needs to save the return registers in the given block. */
1292 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1293 if ((mode = apply_result_mode[regno]) != VOIDmode)
1296 abort (); /* HAVE_untyped_call required. */
1297 valreg = gen_rtx_REG (mode, regno);
1300 emit_call_insn (GEN_CALL_VALUE (valreg,
1301 gen_rtx_MEM (FUNCTION_MODE, function),
1302 const0_rtx, NULL_RTX, const0_rtx));
1304 emit_move_insn (adjust_address (result, GET_MODE (valreg), 0), valreg);
1310 /* Find the CALL insn we just emitted. */
1311 for (call_insn = get_last_insn ();
1312 call_insn && GET_CODE (call_insn) != CALL_INSN;
1313 call_insn = PREV_INSN (call_insn))
1319 /* Put the register usage information on the CALL. If there is already
1320 some usage information, put ours at the end. */
1321 if (CALL_INSN_FUNCTION_USAGE (call_insn))
1325 for (link = CALL_INSN_FUNCTION_USAGE (call_insn); XEXP (link, 1) != 0;
1326 link = XEXP (link, 1))
1329 XEXP (link, 1) = call_fusage;
1332 CALL_INSN_FUNCTION_USAGE (call_insn) = call_fusage;
1334 /* Restore the stack. */
1335 #ifdef HAVE_save_stack_nonlocal
1336 if (HAVE_save_stack_nonlocal)
1337 emit_stack_restore (SAVE_NONLOCAL, old_stack_level, NULL_RTX);
1340 emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX);
1344 /* Return the address of the result block. */
1345 return copy_addr_to_reg (XEXP (result, 0));
1348 /* Perform an untyped return. */
1351 expand_builtin_return (result)
1354 int size, align, regno;
1355 enum machine_mode mode;
1357 rtx call_fusage = 0;
1359 #ifdef POINTERS_EXTEND_UNSIGNED
1360 if (GET_MODE (result) != Pmode)
1361 result = convert_memory_address (Pmode, result);
1364 apply_result_size ();
1365 result = gen_rtx_MEM (BLKmode, result);
1367 #ifdef HAVE_untyped_return
1368 if (HAVE_untyped_return)
1370 emit_jump_insn (gen_untyped_return (result, result_vector (0, result)));
1376 /* Restore the return value and note that each value is used. */
1378 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1379 if ((mode = apply_result_mode[regno]) != VOIDmode)
1381 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
1382 if (size % align != 0)
1383 size = CEIL (size, align) * align;
1384 reg = gen_rtx_REG (mode, INCOMING_REGNO (regno));
1385 emit_move_insn (reg, adjust_address (result, mode, size));
1387 push_to_sequence (call_fusage);
1388 emit_insn (gen_rtx_USE (VOIDmode, reg));
1389 call_fusage = get_insns ();
1391 size += GET_MODE_SIZE (mode);
1394 /* Put the USE insns before the return. */
1395 emit_insn (call_fusage);
1397 /* Return whatever values was restored by jumping directly to the end
1399 expand_null_return ();
1402 /* Used by expand_builtin_classify_type and fold_builtin_classify_type. */
1404 static enum type_class
1405 type_to_class (type)
1408 switch (TREE_CODE (type))
1410 case VOID_TYPE: return void_type_class;
1411 case INTEGER_TYPE: return integer_type_class;
1412 case CHAR_TYPE: return char_type_class;
1413 case ENUMERAL_TYPE: return enumeral_type_class;
1414 case BOOLEAN_TYPE: return boolean_type_class;
1415 case POINTER_TYPE: return pointer_type_class;
1416 case REFERENCE_TYPE: return reference_type_class;
1417 case OFFSET_TYPE: return offset_type_class;
1418 case REAL_TYPE: return real_type_class;
1419 case COMPLEX_TYPE: return complex_type_class;
1420 case FUNCTION_TYPE: return function_type_class;
1421 case METHOD_TYPE: return method_type_class;
1422 case RECORD_TYPE: return record_type_class;
1424 case QUAL_UNION_TYPE: return union_type_class;
1425 case ARRAY_TYPE: return (TYPE_STRING_FLAG (type)
1426 ? string_type_class : array_type_class);
1427 case SET_TYPE: return set_type_class;
1428 case FILE_TYPE: return file_type_class;
1429 case LANG_TYPE: return lang_type_class;
1430 default: return no_type_class;
1434 /* Expand a call to __builtin_classify_type with arguments found in
1438 expand_builtin_classify_type (arglist)
1442 return GEN_INT (type_to_class (TREE_TYPE (TREE_VALUE (arglist))));
1443 return GEN_INT (no_type_class);
1446 /* Expand expression EXP, which is a call to __builtin_constant_p. */
1449 expand_builtin_constant_p (exp)
1452 tree arglist = TREE_OPERAND (exp, 1);
1453 enum machine_mode value_mode = TYPE_MODE (TREE_TYPE (exp));
1458 arglist = TREE_VALUE (arglist);
1460 /* We have taken care of the easy cases during constant folding. This
1461 case is not obvious, so emit (constant_p_rtx (ARGLIST)) and let CSE get a
1462 chance to see if it can deduce whether ARGLIST is constant. */
1464 tmp = expand_expr (arglist, NULL_RTX, VOIDmode, 0);
1465 tmp = gen_rtx_CONSTANT_P_RTX (value_mode, tmp);
1469 /* Expand a call to one of the builtin math functions (sin, cos, or sqrt).
1470 Return 0 if a normal call should be emitted rather than expanding the
1471 function in-line. EXP is the expression that is a call to the builtin
1472 function; if convenient, the result should be placed in TARGET.
1473 SUBTARGET may be used as the target for computing one of EXP's operands. */
1476 expand_builtin_mathfn (exp, target, subtarget)
1478 rtx target, subtarget;
1480 optab builtin_optab;
1482 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
1483 tree arglist = TREE_OPERAND (exp, 1);
1484 enum machine_mode argmode;
1486 if (!validate_arglist (arglist, REAL_TYPE, VOID_TYPE))
1489 /* Stabilize and compute the argument. */
1490 if (TREE_CODE (TREE_VALUE (arglist)) != VAR_DECL
1491 && TREE_CODE (TREE_VALUE (arglist)) != PARM_DECL)
1493 exp = copy_node (exp);
1494 TREE_OPERAND (exp, 1) = arglist;
1495 /* Wrap the computation of the argument in a SAVE_EXPR. That
1496 way, if we need to expand the argument again (as in the
1497 flag_errno_math case below where we cannot directly set
1498 errno), we will not perform side-effects more than once.
1499 Note that here we're mutating the original EXP as well as the
1500 copy; that's the right thing to do in case the original EXP
1501 is expanded later. */
1502 TREE_VALUE (arglist) = save_expr (TREE_VALUE (arglist));
1503 arglist = copy_node (arglist);
1505 op0 = expand_expr (TREE_VALUE (arglist), subtarget, VOIDmode, 0);
1507 /* Make a suitable register to place result in. */
1508 target = gen_reg_rtx (TYPE_MODE (TREE_TYPE (exp)));
1513 switch (DECL_FUNCTION_CODE (fndecl))
1518 builtin_optab = sin_optab; break;
1522 builtin_optab = cos_optab; break;
1524 case BUILT_IN_SQRTF:
1525 case BUILT_IN_SQRTL:
1526 builtin_optab = sqrt_optab; break;
1530 builtin_optab = exp_optab; break;
1534 builtin_optab = log_optab; break;
1539 /* Compute into TARGET.
1540 Set TARGET to wherever the result comes back. */
1541 argmode = TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist)));
1542 target = expand_unop (argmode, builtin_optab, op0, target, 0);
1544 /* If we were unable to expand via the builtin, stop the
1545 sequence (without outputting the insns) and return 0, causing
1546 a call to the library function. */
1553 /* If errno must be maintained, we must set it to EDOM for NaN results. */
1555 if (flag_errno_math && HONOR_NANS (argmode))
1559 lab1 = gen_label_rtx ();
1561 /* Test the result; if it is NaN, set errno=EDOM because
1562 the argument was not in the domain. */
1563 emit_cmp_and_jump_insns (target, target, EQ, 0, GET_MODE (target),
1568 #ifdef GEN_ERRNO_RTX
1569 rtx errno_rtx = GEN_ERRNO_RTX;
1572 = gen_rtx_MEM (word_mode, gen_rtx_SYMBOL_REF (Pmode, "errno"));
1575 emit_move_insn (errno_rtx, GEN_INT (TARGET_EDOM));
1578 /* We can't set errno=EDOM directly; let the library call do it.
1579 Pop the arguments right away in case the call gets deleted. */
1581 expand_call (exp, target, 0);
1588 /* Output the entire sequence. */
1589 insns = get_insns ();
1596 /* Expand expression EXP which is a call to the strlen builtin. Return 0
1597 if we failed the caller should emit a normal call, otherwise
1598 try to get the result in TARGET, if convenient. */
1601 expand_builtin_strlen (exp, target)
1605 tree arglist = TREE_OPERAND (exp, 1);
1606 enum machine_mode value_mode = TYPE_MODE (TREE_TYPE (exp));
1608 if (!validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
1613 tree src = TREE_VALUE (arglist);
1616 = get_pointer_alignment (src, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
1618 rtx result, src_reg, char_rtx, before_strlen;
1619 enum machine_mode insn_mode = value_mode, char_mode;
1620 enum insn_code icode = CODE_FOR_nothing;
1622 /* If SRC is not a pointer type, don't do this operation inline. */
1626 /* Bail out if we can't compute strlen in the right mode. */
1627 while (insn_mode != VOIDmode)
1629 icode = strlen_optab->handlers[(int) insn_mode].insn_code;
1630 if (icode != CODE_FOR_nothing)
1633 insn_mode = GET_MODE_WIDER_MODE (insn_mode);
1635 if (insn_mode == VOIDmode)
1638 /* Make a place to write the result of the instruction. */
1641 && GET_CODE (result) == REG
1642 && GET_MODE (result) == insn_mode
1643 && REGNO (result) >= FIRST_PSEUDO_REGISTER))
1644 result = gen_reg_rtx (insn_mode);
1646 /* Make a place to hold the source address. We will not expand
1647 the actual source until we are sure that the expansion will
1648 not fail -- there are trees that cannot be expanded twice. */
1649 src_reg = gen_reg_rtx (Pmode);
1651 /* Mark the beginning of the strlen sequence so we can emit the
1652 source operand later. */
1653 before_strlen = get_last_insn();
1655 char_rtx = const0_rtx;
1656 char_mode = insn_data[(int) icode].operand[2].mode;
1657 if (! (*insn_data[(int) icode].operand[2].predicate) (char_rtx,
1659 char_rtx = copy_to_mode_reg (char_mode, char_rtx);
1661 pat = GEN_FCN (icode) (result, gen_rtx_MEM (BLKmode, src_reg),
1662 char_rtx, GEN_INT (align));
1667 /* Now that we are assured of success, expand the source. */
1669 pat = memory_address (BLKmode,
1670 expand_expr (src, src_reg, ptr_mode, EXPAND_SUM));
1672 emit_move_insn (src_reg, pat);
1677 emit_insn_after (pat, before_strlen);
1679 emit_insn_before (pat, get_insns ());
1681 /* Return the value in the proper mode for this function. */
1682 if (GET_MODE (result) == value_mode)
1684 else if (target != 0)
1685 convert_move (target, result, 0);
1687 target = convert_to_mode (value_mode, result, 0);
1693 /* Expand a call to the strstr builtin. Return 0 if we failed the
1694 caller should emit a normal call, otherwise try to get the result
1695 in TARGET, if convenient (and in mode MODE if that's convenient). */
1698 expand_builtin_strstr (arglist, target, mode)
1701 enum machine_mode mode;
1703 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
1707 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1709 const char *p1, *p2;
1718 const char *r = strstr (p1, p2);
1723 /* Return an offset into the constant string argument. */
1724 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1725 s1, ssize_int (r - p1))),
1726 target, mode, EXPAND_NORMAL);
1730 return expand_expr (s1, target, mode, EXPAND_NORMAL);
1735 fn = built_in_decls[BUILT_IN_STRCHR];
1739 /* New argument list transforming strstr(s1, s2) to
1740 strchr(s1, s2[0]). */
1742 build_tree_list (NULL_TREE, build_int_2 (p2[0], 0));
1743 arglist = tree_cons (NULL_TREE, s1, arglist);
1744 return expand_expr (build_function_call_expr (fn, arglist),
1745 target, mode, EXPAND_NORMAL);
1749 /* Expand a call to the strchr builtin. Return 0 if we failed the
1750 caller should emit a normal call, otherwise try to get the result
1751 in TARGET, if convenient (and in mode MODE if that's convenient). */
1754 expand_builtin_strchr (arglist, target, mode)
1757 enum machine_mode mode;
1759 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
1763 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1766 if (TREE_CODE (s2) != INTEGER_CST)
1775 if (target_char_cast (s2, &c))
1783 /* Return an offset into the constant string argument. */
1784 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1785 s1, ssize_int (r - p1))),
1786 target, mode, EXPAND_NORMAL);
1789 /* FIXME: Should use here strchrM optab so that ports can optimize
1795 /* Expand a call to the strrchr builtin. Return 0 if we failed the
1796 caller should emit a normal call, otherwise try to get the result
1797 in TARGET, if convenient (and in mode MODE if that's convenient). */
1800 expand_builtin_strrchr (arglist, target, mode)
1803 enum machine_mode mode;
1805 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
1809 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1813 if (TREE_CODE (s2) != INTEGER_CST)
1822 if (target_char_cast (s2, &c))
1825 r = strrchr (p1, c);
1830 /* Return an offset into the constant string argument. */
1831 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1832 s1, ssize_int (r - p1))),
1833 target, mode, EXPAND_NORMAL);
1836 if (! integer_zerop (s2))
1839 fn = built_in_decls[BUILT_IN_STRCHR];
1843 /* Transform strrchr(s1, '\0') to strchr(s1, '\0'). */
1844 return expand_expr (build_function_call_expr (fn, arglist),
1845 target, mode, EXPAND_NORMAL);
1849 /* Expand a call to the strpbrk builtin. Return 0 if we failed the
1850 caller should emit a normal call, otherwise try to get the result
1851 in TARGET, if convenient (and in mode MODE if that's convenient). */
1854 expand_builtin_strpbrk (arglist, target, mode)
1857 enum machine_mode mode;
1859 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
1863 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1865 const char *p1, *p2;
1874 const char *r = strpbrk (p1, p2);
1879 /* Return an offset into the constant string argument. */
1880 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1881 s1, ssize_int (r - p1))),
1882 target, mode, EXPAND_NORMAL);
1887 /* strpbrk(x, "") == NULL.
1888 Evaluate and ignore the arguments in case they had
1890 expand_expr (s1, const0_rtx, VOIDmode, EXPAND_NORMAL);
1895 return 0; /* Really call strpbrk. */
1897 fn = built_in_decls[BUILT_IN_STRCHR];
1901 /* New argument list transforming strpbrk(s1, s2) to
1902 strchr(s1, s2[0]). */
1904 build_tree_list (NULL_TREE, build_int_2 (p2[0], 0));
1905 arglist = tree_cons (NULL_TREE, s1, arglist);
1906 return expand_expr (build_function_call_expr (fn, arglist),
1907 target, mode, EXPAND_NORMAL);
1911 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
1912 bytes from constant string DATA + OFFSET and return it as target
1916 builtin_memcpy_read_str (data, offset, mode)
1918 HOST_WIDE_INT offset;
1919 enum machine_mode mode;
1921 const char *str = (const char *) data;
1924 || ((unsigned HOST_WIDE_INT) offset + GET_MODE_SIZE (mode)
1925 > strlen (str) + 1))
1926 abort (); /* Attempt to read past the end of constant string. */
1928 return c_readstr (str + offset, mode);
1931 /* Expand a call to the memcpy builtin, with arguments in ARGLIST.
1932 Return 0 if we failed, the caller should emit a normal call, otherwise
1933 try to get the result in TARGET, if convenient (and in mode MODE if
1934 that's convenient). */
1937 expand_builtin_memcpy (arglist, target, mode)
1940 enum machine_mode mode;
1942 if (!validate_arglist (arglist,
1943 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
1947 tree dest = TREE_VALUE (arglist);
1948 tree src = TREE_VALUE (TREE_CHAIN (arglist));
1949 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
1950 const char *src_str;
1952 unsigned int src_align = get_pointer_alignment (src, BIGGEST_ALIGNMENT);
1953 unsigned int dest_align
1954 = get_pointer_alignment (dest, BIGGEST_ALIGNMENT);
1955 rtx dest_mem, src_mem, dest_addr, len_rtx;
1957 /* If DEST is not a pointer type, call the normal function. */
1958 if (dest_align == 0)
1961 /* If the LEN parameter is zero, return DEST. */
1962 if (host_integerp (len, 1) && tree_low_cst (len, 1) == 0)
1964 /* Evaluate and ignore SRC in case it has side-effects. */
1965 expand_expr (src, const0_rtx, VOIDmode, EXPAND_NORMAL);
1966 return expand_expr (dest, target, mode, EXPAND_NORMAL);
1969 /* If either SRC is not a pointer type, don't do this
1970 operation in-line. */
1974 dest_mem = get_memory_rtx (dest);
1975 set_mem_align (dest_mem, dest_align);
1976 len_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
1977 src_str = c_getstr (src);
1979 /* If SRC is a string constant and block move would be done
1980 by pieces, we can avoid loading the string from memory
1981 and only stored the computed constants. */
1983 && GET_CODE (len_rtx) == CONST_INT
1984 && (unsigned HOST_WIDE_INT) INTVAL (len_rtx) <= strlen (src_str) + 1
1985 && can_store_by_pieces (INTVAL (len_rtx), builtin_memcpy_read_str,
1986 (PTR) src_str, dest_align))
1988 store_by_pieces (dest_mem, INTVAL (len_rtx),
1989 builtin_memcpy_read_str,
1990 (PTR) src_str, dest_align);
1991 dest_mem = force_operand (XEXP (dest_mem, 0), NULL_RTX);
1992 #ifdef POINTERS_EXTEND_UNSIGNED
1993 if (GET_MODE (dest_mem) != ptr_mode)
1994 dest_mem = convert_memory_address (ptr_mode, dest_mem);
1999 src_mem = get_memory_rtx (src);
2000 set_mem_align (src_mem, src_align);
2002 /* Copy word part most expediently. */
2003 dest_addr = emit_block_move (dest_mem, src_mem, len_rtx,
2008 dest_addr = force_operand (XEXP (dest_mem, 0), NULL_RTX);
2009 #ifdef POINTERS_EXTEND_UNSIGNED
2010 if (GET_MODE (dest_addr) != ptr_mode)
2011 dest_addr = convert_memory_address (ptr_mode, dest_addr);
2019 /* Expand expression EXP, which is a call to the strcpy builtin. Return 0
2020 if we failed the caller should emit a normal call, otherwise try to get
2021 the result in TARGET, if convenient (and in mode MODE if that's
2025 expand_builtin_strcpy (exp, target, mode)
2028 enum machine_mode mode;
2030 tree arglist = TREE_OPERAND (exp, 1);
2033 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2036 fn = built_in_decls[BUILT_IN_MEMCPY];
2040 len = c_strlen (TREE_VALUE (TREE_CHAIN (arglist)));
2044 len = size_binop (PLUS_EXPR, len, ssize_int (1));
2045 chainon (arglist, build_tree_list (NULL_TREE, len));
2046 return expand_expr (build_function_call_expr (fn, arglist),
2047 target, mode, EXPAND_NORMAL);
2050 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
2051 bytes from constant string DATA + OFFSET and return it as target
2055 builtin_strncpy_read_str (data, offset, mode)
2057 HOST_WIDE_INT offset;
2058 enum machine_mode mode;
2060 const char *str = (const char *) data;
2062 if ((unsigned HOST_WIDE_INT) offset > strlen (str))
2065 return c_readstr (str + offset, mode);
2068 /* Expand expression EXP, which is a call to the strncpy builtin. Return 0
2069 if we failed the caller should emit a normal call. */
2072 expand_builtin_strncpy (arglist, target, mode)
2075 enum machine_mode mode;
2077 if (!validate_arglist (arglist,
2078 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2082 tree slen = c_strlen (TREE_VALUE (TREE_CHAIN (arglist)));
2083 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2086 /* We must be passed a constant len parameter. */
2087 if (TREE_CODE (len) != INTEGER_CST)
2090 /* If the len parameter is zero, return the dst parameter. */
2091 if (integer_zerop (len))
2093 /* Evaluate and ignore the src argument in case it has
2095 expand_expr (TREE_VALUE (TREE_CHAIN (arglist)), const0_rtx,
2096 VOIDmode, EXPAND_NORMAL);
2097 /* Return the dst parameter. */
2098 return expand_expr (TREE_VALUE (arglist), target, mode,
2102 /* Now, we must be passed a constant src ptr parameter. */
2103 if (slen == 0 || TREE_CODE (slen) != INTEGER_CST)
2106 slen = size_binop (PLUS_EXPR, slen, ssize_int (1));
2108 /* We're required to pad with trailing zeros if the requested
2109 len is greater than strlen(s2)+1. In that case try to
2110 use store_by_pieces, if it fails, punt. */
2111 if (tree_int_cst_lt (slen, len))
2113 tree dest = TREE_VALUE (arglist);
2114 unsigned int dest_align
2115 = get_pointer_alignment (dest, BIGGEST_ALIGNMENT);
2116 const char *p = c_getstr (TREE_VALUE (TREE_CHAIN (arglist)));
2119 if (!p || dest_align == 0 || !host_integerp (len, 1)
2120 || !can_store_by_pieces (tree_low_cst (len, 1),
2121 builtin_strncpy_read_str,
2122 (PTR) p, dest_align))
2125 dest_mem = get_memory_rtx (dest);
2126 store_by_pieces (dest_mem, tree_low_cst (len, 1),
2127 builtin_strncpy_read_str,
2128 (PTR) p, dest_align);
2129 dest_mem = force_operand (XEXP (dest_mem, 0), NULL_RTX);
2130 #ifdef POINTERS_EXTEND_UNSIGNED
2131 if (GET_MODE (dest_mem) != ptr_mode)
2132 dest_mem = convert_memory_address (ptr_mode, dest_mem);
2137 /* OK transform into builtin memcpy. */
2138 fn = built_in_decls[BUILT_IN_MEMCPY];
2141 return expand_expr (build_function_call_expr (fn, arglist),
2142 target, mode, EXPAND_NORMAL);
2146 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
2147 bytes from constant string DATA + OFFSET and return it as target
2151 builtin_memset_read_str (data, offset, mode)
2153 HOST_WIDE_INT offset ATTRIBUTE_UNUSED;
2154 enum machine_mode mode;
2156 const char *c = (const char *) data;
2157 char *p = alloca (GET_MODE_SIZE (mode));
2159 memset (p, *c, GET_MODE_SIZE (mode));
2161 return c_readstr (p, mode);
2164 /* Callback routine for store_by_pieces. Return the RTL of a register
2165 containing GET_MODE_SIZE (MODE) consecutive copies of the unsigned
2166 char value given in the RTL register data. For example, if mode is
2167 4 bytes wide, return the RTL for 0x01010101*data. */
2170 builtin_memset_gen_str (data, offset, mode)
2172 HOST_WIDE_INT offset ATTRIBUTE_UNUSED;
2173 enum machine_mode mode;
2179 size = GET_MODE_SIZE (mode);
2184 memset (p, 1, size);
2185 coeff = c_readstr (p, mode);
2187 target = convert_to_mode (mode, (rtx)data, 1);
2188 target = expand_mult (mode, target, coeff, NULL_RTX, 1);
2189 return force_reg (mode, target);
2192 /* Expand expression EXP, which is a call to the memset builtin. Return 0
2193 if we failed the caller should emit a normal call, otherwise try to get
2194 the result in TARGET, if convenient (and in mode MODE if that's
2198 expand_builtin_memset (exp, target, mode)
2201 enum machine_mode mode;
2203 tree arglist = TREE_OPERAND (exp, 1);
2205 if (!validate_arglist (arglist,
2206 POINTER_TYPE, INTEGER_TYPE, INTEGER_TYPE, VOID_TYPE))
2210 tree dest = TREE_VALUE (arglist);
2211 tree val = TREE_VALUE (TREE_CHAIN (arglist));
2212 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2215 unsigned int dest_align
2216 = get_pointer_alignment (dest, BIGGEST_ALIGNMENT);
2217 rtx dest_mem, dest_addr, len_rtx;
2219 /* If DEST is not a pointer type, don't do this
2220 operation in-line. */
2221 if (dest_align == 0)
2224 /* If the LEN parameter is zero, return DEST. */
2225 if (host_integerp (len, 1) && tree_low_cst (len, 1) == 0)
2227 /* Evaluate and ignore VAL in case it has side-effects. */
2228 expand_expr (val, const0_rtx, VOIDmode, EXPAND_NORMAL);
2229 return expand_expr (dest, target, mode, EXPAND_NORMAL);
2232 if (TREE_CODE (val) != INTEGER_CST)
2236 if (!host_integerp (len, 1))
2239 if (optimize_size && tree_low_cst (len, 1) > 1)
2242 /* Assume that we can memset by pieces if we can store the
2243 * the coefficients by pieces (in the required modes).
2244 * We can't pass builtin_memset_gen_str as that emits RTL. */
2246 if (!can_store_by_pieces (tree_low_cst (len, 1),
2247 builtin_memset_read_str,
2248 (PTR) &c, dest_align))
2251 val = fold (build1 (CONVERT_EXPR, unsigned_char_type_node, val));
2252 val_rtx = expand_expr (val, NULL_RTX, VOIDmode, 0);
2253 val_rtx = force_reg (TYPE_MODE (unsigned_char_type_node),
2255 dest_mem = get_memory_rtx (dest);
2256 store_by_pieces (dest_mem, tree_low_cst (len, 1),
2257 builtin_memset_gen_str,
2258 (PTR)val_rtx, dest_align);
2259 dest_mem = force_operand (XEXP (dest_mem, 0), NULL_RTX);
2260 #ifdef POINTERS_EXTEND_UNSIGNED
2261 if (GET_MODE (dest_mem) != ptr_mode)
2262 dest_mem = convert_memory_address (ptr_mode, dest_mem);
2267 if (target_char_cast (val, &c))
2272 if (!host_integerp (len, 1))
2274 if (!can_store_by_pieces (tree_low_cst (len, 1),
2275 builtin_memset_read_str, (PTR) &c,
2279 dest_mem = get_memory_rtx (dest);
2280 store_by_pieces (dest_mem, tree_low_cst (len, 1),
2281 builtin_memset_read_str,
2282 (PTR) &c, dest_align);
2283 dest_mem = force_operand (XEXP (dest_mem, 0), NULL_RTX);
2284 #ifdef POINTERS_EXTEND_UNSIGNED
2285 if (GET_MODE (dest_mem) != ptr_mode)
2286 dest_mem = convert_memory_address (ptr_mode, dest_mem);
2291 len_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
2293 dest_mem = get_memory_rtx (dest);
2294 set_mem_align (dest_mem, dest_align);
2295 dest_addr = clear_storage (dest_mem, len_rtx);
2299 dest_addr = force_operand (XEXP (dest_mem, 0), NULL_RTX);
2300 #ifdef POINTERS_EXTEND_UNSIGNED
2301 if (GET_MODE (dest_addr) != ptr_mode)
2302 dest_addr = convert_memory_address (ptr_mode, dest_addr);
2310 /* Expand expression EXP, which is a call to the bzero builtin. Return 0
2311 if we failed the caller should emit a normal call. */
2314 expand_builtin_bzero (exp)
2317 tree arglist = TREE_OPERAND (exp, 1);
2318 tree dest, size, newarglist;
2321 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2324 dest = TREE_VALUE (arglist);
2325 size = TREE_VALUE (TREE_CHAIN (arglist));
2327 /* New argument list transforming bzero(ptr x, int y) to
2328 memset(ptr x, int 0, size_t y). This is done this way
2329 so that if it isn't expanded inline, we fallback to
2330 calling bzero instead of memset. */
2332 newarglist = build_tree_list (NULL_TREE, convert (sizetype, size));
2333 newarglist = tree_cons (NULL_TREE, integer_zero_node, newarglist);
2334 newarglist = tree_cons (NULL_TREE, dest, newarglist);
2336 TREE_OPERAND (exp, 1) = newarglist;
2337 result = expand_builtin_memset (exp, const0_rtx, VOIDmode);
2339 /* Always restore the original arguments. */
2340 TREE_OPERAND (exp, 1) = arglist;
2345 /* Expand expression EXP, which is a call to the memcmp or the strcmp builtin.
2346 ARGLIST is the argument list for this call. Return 0 if we failed and the
2347 caller should emit a normal call, otherwise try to get the result in
2348 TARGET, if convenient (and in mode MODE, if that's convenient). */
2351 expand_builtin_memcmp (exp, arglist, target, mode)
2352 tree exp ATTRIBUTE_UNUSED;
2355 enum machine_mode mode;
2357 tree arg1, arg2, len;
2358 const char *p1, *p2;
2360 if (!validate_arglist (arglist,
2361 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2364 arg1 = TREE_VALUE (arglist);
2365 arg2 = TREE_VALUE (TREE_CHAIN (arglist));
2366 len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2368 /* If the len parameter is zero, return zero. */
2369 if (host_integerp (len, 1) && tree_low_cst (len, 1) == 0)
2371 /* Evaluate and ignore arg1 and arg2 in case they have
2373 expand_expr (arg1, const0_rtx, VOIDmode, EXPAND_NORMAL);
2374 expand_expr (arg2, const0_rtx, VOIDmode, EXPAND_NORMAL);
2378 p1 = c_getstr (arg1);
2379 p2 = c_getstr (arg2);
2381 /* If all arguments are constant, and the value of len is not greater
2382 than the lengths of arg1 and arg2, evaluate at compile-time. */
2383 if (host_integerp (len, 1) && p1 && p2
2384 && compare_tree_int (len, strlen (p1) + 1) <= 0
2385 && compare_tree_int (len, strlen (p2) + 1) <= 0)
2387 const int r = memcmp (p1, p2, tree_low_cst (len, 1));
2389 return (r < 0 ? constm1_rtx : (r > 0 ? const1_rtx : const0_rtx));
2392 /* If len parameter is one, return an expression corresponding to
2393 (*(const unsigned char*)arg1 - (const unsigned char*)arg2). */
2394 if (host_integerp (len, 1) && tree_low_cst (len, 1) == 1)
2396 tree cst_uchar_node = build_type_variant (unsigned_char_type_node, 1, 0);
2397 tree cst_uchar_ptr_node = build_pointer_type (cst_uchar_node);
2399 fold (build1 (CONVERT_EXPR, integer_type_node,
2400 build1 (INDIRECT_REF, cst_uchar_node,
2401 build1 (NOP_EXPR, cst_uchar_ptr_node, arg1))));
2403 fold (build1 (CONVERT_EXPR, integer_type_node,
2404 build1 (INDIRECT_REF, cst_uchar_node,
2405 build1 (NOP_EXPR, cst_uchar_ptr_node, arg2))));
2406 tree result = fold (build (MINUS_EXPR, integer_type_node, ind1, ind2));
2407 return expand_expr (result, target, mode, EXPAND_NORMAL);
2410 #ifdef HAVE_cmpstrsi
2412 rtx arg1_rtx, arg2_rtx, arg3_rtx;
2417 = get_pointer_alignment (arg1, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
2419 = get_pointer_alignment (arg2, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
2420 enum machine_mode insn_mode
2421 = insn_data[(int) CODE_FOR_cmpstrsi].operand[0].mode;
2423 /* If we don't have POINTER_TYPE, call the function. */
2424 if (arg1_align == 0 || arg2_align == 0)
2427 /* Make a place to write the result of the instruction. */
2430 && GET_CODE (result) == REG && GET_MODE (result) == insn_mode
2431 && REGNO (result) >= FIRST_PSEUDO_REGISTER))
2432 result = gen_reg_rtx (insn_mode);
2434 arg1_rtx = get_memory_rtx (arg1);
2435 arg2_rtx = get_memory_rtx (arg2);
2436 arg3_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
2440 insn = gen_cmpstrsi (result, arg1_rtx, arg2_rtx, arg3_rtx,
2441 GEN_INT (MIN (arg1_align, arg2_align)));
2446 emit_library_call_value (memcmp_libfunc, result, LCT_PURE_MAKE_BLOCK,
2447 TYPE_MODE (integer_type_node), 3,
2448 XEXP (arg1_rtx, 0), Pmode,
2449 XEXP (arg2_rtx, 0), Pmode,
2450 convert_to_mode (TYPE_MODE (sizetype), arg3_rtx,
2451 TREE_UNSIGNED (sizetype)),
2452 TYPE_MODE (sizetype));
2454 /* Return the value in the proper mode for this function. */
2455 mode = TYPE_MODE (TREE_TYPE (exp));
2456 if (GET_MODE (result) == mode)
2458 else if (target != 0)
2460 convert_move (target, result, 0);
2464 return convert_to_mode (mode, result, 0);
2471 /* Expand expression EXP, which is a call to the strcmp builtin. Return 0
2472 if we failed the caller should emit a normal call, otherwise try to get
2473 the result in TARGET, if convenient. */
2476 expand_builtin_strcmp (exp, target, mode)
2479 enum machine_mode mode;
2481 tree arglist = TREE_OPERAND (exp, 1);
2482 tree arg1, arg2, len, len2, fn;
2483 const char *p1, *p2;
2485 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2488 arg1 = TREE_VALUE (arglist);
2489 arg2 = TREE_VALUE (TREE_CHAIN (arglist));
2491 p1 = c_getstr (arg1);
2492 p2 = c_getstr (arg2);
2496 const int i = strcmp (p1, p2);
2497 return (i < 0 ? constm1_rtx : (i > 0 ? const1_rtx : const0_rtx));
2500 /* If either arg is "", return an expression corresponding to
2501 (*(const unsigned char*)arg1 - (const unsigned char*)arg2). */
2502 if ((p1 && *p1 == '\0') || (p2 && *p2 == '\0'))
2504 tree cst_uchar_node = build_type_variant (unsigned_char_type_node, 1, 0);
2505 tree cst_uchar_ptr_node = build_pointer_type (cst_uchar_node);
2507 fold (build1 (CONVERT_EXPR, integer_type_node,
2508 build1 (INDIRECT_REF, cst_uchar_node,
2509 build1 (NOP_EXPR, cst_uchar_ptr_node, arg1))));
2511 fold (build1 (CONVERT_EXPR, integer_type_node,
2512 build1 (INDIRECT_REF, cst_uchar_node,
2513 build1 (NOP_EXPR, cst_uchar_ptr_node, arg2))));
2514 tree result = fold (build (MINUS_EXPR, integer_type_node, ind1, ind2));
2515 return expand_expr (result, target, mode, EXPAND_NORMAL);
2518 len = c_strlen (arg1);
2519 len2 = c_strlen (arg2);
2522 len = size_binop (PLUS_EXPR, ssize_int (1), len);
2525 len2 = size_binop (PLUS_EXPR, ssize_int (1), len2);
2527 /* If we don't have a constant length for the first, use the length
2528 of the second, if we know it. We don't require a constant for
2529 this case; some cost analysis could be done if both are available
2530 but neither is constant. For now, assume they're equally cheap
2531 unless one has side effects.
2533 If both strings have constant lengths, use the smaller. This
2534 could arise if optimization results in strcpy being called with
2535 two fixed strings, or if the code was machine-generated. We should
2536 add some code to the `memcmp' handler below to deal with such
2537 situations, someday. */
2539 if (!len || TREE_CODE (len) != INTEGER_CST)
2541 if (len2 && !TREE_SIDE_EFFECTS (len2))
2546 else if (len2 && TREE_CODE (len2) == INTEGER_CST
2547 && tree_int_cst_lt (len2, len))
2550 /* If both arguments have side effects, we cannot optimize. */
2551 if (TREE_SIDE_EFFECTS (len))
2554 fn = built_in_decls[BUILT_IN_MEMCMP];
2558 chainon (arglist, build_tree_list (NULL_TREE, len));
2559 return expand_expr (build_function_call_expr (fn, arglist),
2560 target, mode, EXPAND_NORMAL);
2563 /* Expand expression EXP, which is a call to the strncmp builtin. Return 0
2564 if we failed the caller should emit a normal call, otherwise try to get
2565 the result in TARGET, if convenient. */
2568 expand_builtin_strncmp (exp, target, mode)
2571 enum machine_mode mode;
2573 tree arglist = TREE_OPERAND (exp, 1);
2574 tree fn, newarglist, len = 0;
2575 tree arg1, arg2, arg3;
2576 const char *p1, *p2;
2578 if (!validate_arglist (arglist,
2579 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2582 arg1 = TREE_VALUE (arglist);
2583 arg2 = TREE_VALUE (TREE_CHAIN (arglist));
2584 arg3 = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2586 /* If the len parameter is zero, return zero. */
2587 if (host_integerp (arg3, 1) && tree_low_cst (arg3, 1) == 0)
2589 /* Evaluate and ignore arg1 and arg2 in case they have
2591 expand_expr (arg1, const0_rtx, VOIDmode, EXPAND_NORMAL);
2592 expand_expr (arg2, const0_rtx, VOIDmode, EXPAND_NORMAL);
2596 p1 = c_getstr (arg1);
2597 p2 = c_getstr (arg2);
2599 /* If all arguments are constant, evaluate at compile-time. */
2600 if (host_integerp (arg3, 1) && p1 && p2)
2602 const int r = strncmp (p1, p2, tree_low_cst (arg3, 1));
2603 return (r < 0 ? constm1_rtx : (r > 0 ? const1_rtx : const0_rtx));
2606 /* If len == 1 or (either string parameter is "" and (len >= 1)),
2607 return (*(const u_char*)arg1 - *(const u_char*)arg2). */
2608 if (host_integerp (arg3, 1)
2609 && (tree_low_cst (arg3, 1) == 1
2610 || (tree_low_cst (arg3, 1) > 1
2611 && ((p1 && *p1 == '\0') || (p2 && *p2 == '\0')))))
2613 tree cst_uchar_node = build_type_variant (unsigned_char_type_node, 1, 0);
2614 tree cst_uchar_ptr_node = build_pointer_type (cst_uchar_node);
2616 fold (build1 (CONVERT_EXPR, integer_type_node,
2617 build1 (INDIRECT_REF, cst_uchar_node,
2618 build1 (NOP_EXPR, cst_uchar_ptr_node, arg1))));
2620 fold (build1 (CONVERT_EXPR, integer_type_node,
2621 build1 (INDIRECT_REF, cst_uchar_node,
2622 build1 (NOP_EXPR, cst_uchar_ptr_node, arg2))));
2623 tree result = fold (build (MINUS_EXPR, integer_type_node, ind1, ind2));
2624 return expand_expr (result, target, mode, EXPAND_NORMAL);
2627 /* If c_strlen can determine an expression for one of the string
2628 lengths, and it doesn't have side effects, then call
2629 expand_builtin_memcmp() using length MIN(strlen(string)+1, arg3). */
2631 /* Perhaps one of the strings is really constant, if so prefer
2632 that constant length over the other string's length. */
2634 len = c_strlen (arg1);
2636 len = c_strlen (arg2);
2638 /* If we still don't have a len, try either string arg as long
2639 as they don't have side effects. */
2640 if (!len && !TREE_SIDE_EFFECTS (arg1))
2641 len = c_strlen (arg1);
2642 if (!len && !TREE_SIDE_EFFECTS (arg2))
2643 len = c_strlen (arg2);
2644 /* If we still don't have a length, punt. */
2648 fn = built_in_decls[BUILT_IN_MEMCMP];
2652 /* Add one to the string length. */
2653 len = fold (size_binop (PLUS_EXPR, len, ssize_int (1)));
2655 /* The actual new length parameter is MIN(len,arg3). */
2656 len = fold (build (MIN_EXPR, TREE_TYPE (len), len, arg3));
2658 newarglist = build_tree_list (NULL_TREE, len);
2659 newarglist = tree_cons (NULL_TREE, arg2, newarglist);
2660 newarglist = tree_cons (NULL_TREE, arg1, newarglist);
2661 return expand_expr (build_function_call_expr (fn, newarglist),
2662 target, mode, EXPAND_NORMAL);
2665 /* Expand expression EXP, which is a call to the strcat builtin.
2666 Return 0 if we failed the caller should emit a normal call,
2667 otherwise try to get the result in TARGET, if convenient. */
2670 expand_builtin_strcat (arglist, target, mode)
2673 enum machine_mode mode;
2675 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2679 tree dst = TREE_VALUE (arglist),
2680 src = TREE_VALUE (TREE_CHAIN (arglist));
2681 const char *p = c_getstr (src);
2683 /* If the string length is zero, return the dst parameter. */
2684 if (p && *p == '\0')
2685 return expand_expr (dst, target, mode, EXPAND_NORMAL);
2691 /* Expand expression EXP, which is a call to the strncat builtin.
2692 Return 0 if we failed the caller should emit a normal call,
2693 otherwise try to get the result in TARGET, if convenient. */
2696 expand_builtin_strncat (arglist, target, mode)
2699 enum machine_mode mode;
2701 if (!validate_arglist (arglist,
2702 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2706 tree dst = TREE_VALUE (arglist),
2707 src = TREE_VALUE (TREE_CHAIN (arglist)),
2708 len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2709 const char *p = c_getstr (src);
2711 /* If the requested length is zero, or the src parameter string
2712 length is zero, return the dst parameter. */
2713 if (integer_zerop (len) || (p && *p == '\0'))
2715 /* Evaluate and ignore the src and len parameters in case
2716 they have side-effects. */
2717 expand_expr (src, const0_rtx, VOIDmode, EXPAND_NORMAL);
2718 expand_expr (len, const0_rtx, VOIDmode, EXPAND_NORMAL);
2719 return expand_expr (dst, target, mode, EXPAND_NORMAL);
2722 /* If the requested len is greater than or equal to the string
2723 length, call strcat. */
2724 if (TREE_CODE (len) == INTEGER_CST && p
2725 && compare_tree_int (len, strlen (p)) >= 0)
2728 = tree_cons (NULL_TREE, dst, build_tree_list (NULL_TREE, src));
2729 tree fn = built_in_decls[BUILT_IN_STRCAT];
2731 /* If the replacement _DECL isn't initialized, don't do the
2736 return expand_expr (build_function_call_expr (fn, newarglist),
2737 target, mode, EXPAND_NORMAL);
2743 /* Expand expression EXP, which is a call to the strspn builtin.
2744 Return 0 if we failed the caller should emit a normal call,
2745 otherwise try to get the result in TARGET, if convenient. */
2748 expand_builtin_strspn (arglist, target, mode)
2751 enum machine_mode mode;
2753 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2757 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
2758 const char *p1 = c_getstr (s1), *p2 = c_getstr (s2);
2760 /* If both arguments are constants, evaluate at compile-time. */
2763 const size_t r = strspn (p1, p2);
2764 return expand_expr (size_int (r), target, mode, EXPAND_NORMAL);
2767 /* If either argument is "", return 0. */
2768 if ((p1 && *p1 == '\0') || (p2 && *p2 == '\0'))
2770 /* Evaluate and ignore both arguments in case either one has
2772 expand_expr (s1, const0_rtx, VOIDmode, EXPAND_NORMAL);
2773 expand_expr (s2, const0_rtx, VOIDmode, EXPAND_NORMAL);
2780 /* Expand expression EXP, which is a call to the strcspn builtin.
2781 Return 0 if we failed the caller should emit a normal call,
2782 otherwise try to get the result in TARGET, if convenient. */
2785 expand_builtin_strcspn (arglist, target, mode)
2788 enum machine_mode mode;
2790 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2794 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
2795 const char *p1 = c_getstr (s1), *p2 = c_getstr (s2);
2797 /* If both arguments are constants, evaluate at compile-time. */
2800 const size_t r = strcspn (p1, p2);
2801 return expand_expr (size_int (r), target, mode, EXPAND_NORMAL);
2804 /* If the first argument is "", return 0. */
2805 if (p1 && *p1 == '\0')
2807 /* Evaluate and ignore argument s2 in case it has
2809 expand_expr (s2, const0_rtx, VOIDmode, EXPAND_NORMAL);
2813 /* If the second argument is "", return __builtin_strlen(s1). */
2814 if (p2 && *p2 == '\0')
2816 tree newarglist = build_tree_list (NULL_TREE, s1),
2817 fn = built_in_decls[BUILT_IN_STRLEN];
2819 /* If the replacement _DECL isn't initialized, don't do the
2824 return expand_expr (build_function_call_expr (fn, newarglist),
2825 target, mode, EXPAND_NORMAL);
2831 /* Expand a call to __builtin_saveregs, generating the result in TARGET,
2832 if that's convenient. */
2835 expand_builtin_saveregs ()
2839 /* Don't do __builtin_saveregs more than once in a function.
2840 Save the result of the first call and reuse it. */
2841 if (saveregs_value != 0)
2842 return saveregs_value;
2844 /* When this function is called, it means that registers must be
2845 saved on entry to this function. So we migrate the call to the
2846 first insn of this function. */
2850 #ifdef EXPAND_BUILTIN_SAVEREGS
2851 /* Do whatever the machine needs done in this case. */
2852 val = EXPAND_BUILTIN_SAVEREGS ();
2854 /* ??? We used to try and build up a call to the out of line function,
2855 guessing about what registers needed saving etc. This became much
2856 harder with __builtin_va_start, since we don't have a tree for a
2857 call to __builtin_saveregs to fall back on. There was exactly one
2858 port (i860) that used this code, and I'm unconvinced it could actually
2859 handle the general case. So we no longer try to handle anything
2860 weird and make the backend absorb the evil. */
2862 error ("__builtin_saveregs not supported by this target");
2869 saveregs_value = val;
2871 /* Put the insns after the NOTE that starts the function. If this
2872 is inside a start_sequence, make the outer-level insn chain current, so
2873 the code is placed at the start of the function. */
2874 push_topmost_sequence ();
2875 emit_insn_after (seq, get_insns ());
2876 pop_topmost_sequence ();
2881 /* __builtin_args_info (N) returns word N of the arg space info
2882 for the current function. The number and meanings of words
2883 is controlled by the definition of CUMULATIVE_ARGS. */
2886 expand_builtin_args_info (exp)
2889 tree arglist = TREE_OPERAND (exp, 1);
2890 int nwords = sizeof (CUMULATIVE_ARGS) / sizeof (int);
2891 int *word_ptr = (int *) ¤t_function_args_info;
2893 /* These are used by the code below that is if 0'ed away */
2895 tree type, elts, result;
2898 if (sizeof (CUMULATIVE_ARGS) % sizeof (int) != 0)
2903 if (!host_integerp (TREE_VALUE (arglist), 0))
2904 error ("argument of `__builtin_args_info' must be constant");
2907 HOST_WIDE_INT wordnum = tree_low_cst (TREE_VALUE (arglist), 0);
2909 if (wordnum < 0 || wordnum >= nwords)
2910 error ("argument of `__builtin_args_info' out of range");
2912 return GEN_INT (word_ptr[wordnum]);
2916 error ("missing argument in `__builtin_args_info'");
2921 for (i = 0; i < nwords; i++)
2922 elts = tree_cons (NULL_TREE, build_int_2 (word_ptr[i], 0));
2924 type = build_array_type (integer_type_node,
2925 build_index_type (build_int_2 (nwords, 0)));
2926 result = build (CONSTRUCTOR, type, NULL_TREE, nreverse (elts));
2927 TREE_CONSTANT (result) = 1;
2928 TREE_STATIC (result) = 1;
2929 result = build1 (INDIRECT_REF, build_pointer_type (type), result);
2930 TREE_CONSTANT (result) = 1;
2931 return expand_expr (result, NULL_RTX, VOIDmode, 0);
2935 /* Expand ARGLIST, from a call to __builtin_next_arg. */
2938 expand_builtin_next_arg (arglist)
2941 tree fntype = TREE_TYPE (current_function_decl);
2943 if (TYPE_ARG_TYPES (fntype) == 0
2944 || (TREE_VALUE (tree_last (TYPE_ARG_TYPES (fntype)))
2947 error ("`va_start' used in function with fixed args");
2953 tree last_parm = tree_last (DECL_ARGUMENTS (current_function_decl));
2954 tree arg = TREE_VALUE (arglist);
2956 /* Strip off all nops for the sake of the comparison. This
2957 is not quite the same as STRIP_NOPS. It does more.
2958 We must also strip off INDIRECT_EXPR for C++ reference
2960 while (TREE_CODE (arg) == NOP_EXPR
2961 || TREE_CODE (arg) == CONVERT_EXPR
2962 || TREE_CODE (arg) == NON_LVALUE_EXPR
2963 || TREE_CODE (arg) == INDIRECT_REF)
2964 arg = TREE_OPERAND (arg, 0);
2965 if (arg != last_parm)
2966 warning ("second parameter of `va_start' not last named argument");
2969 /* Evidently an out of date version of <stdarg.h>; can't validate
2970 va_start's second argument, but can still work as intended. */
2971 warning ("`__builtin_next_arg' called without an argument");
2973 return expand_binop (Pmode, add_optab,
2974 current_function_internal_arg_pointer,
2975 current_function_arg_offset_rtx,
2976 NULL_RTX, 0, OPTAB_LIB_WIDEN);
2979 /* Make it easier for the backends by protecting the valist argument
2980 from multiple evaluations. */
2983 stabilize_va_list (valist, needs_lvalue)
2987 if (TREE_CODE (va_list_type_node) == ARRAY_TYPE)
2989 if (TREE_SIDE_EFFECTS (valist))
2990 valist = save_expr (valist);
2992 /* For this case, the backends will be expecting a pointer to
2993 TREE_TYPE (va_list_type_node), but it's possible we've
2994 actually been given an array (an actual va_list_type_node).
2996 if (TREE_CODE (TREE_TYPE (valist)) == ARRAY_TYPE)
2998 tree p1 = build_pointer_type (TREE_TYPE (va_list_type_node));
2999 tree p2 = build_pointer_type (va_list_type_node);
3001 valist = build1 (ADDR_EXPR, p2, valist);
3002 valist = fold (build1 (NOP_EXPR, p1, valist));
3011 if (! TREE_SIDE_EFFECTS (valist))
3014 pt = build_pointer_type (va_list_type_node);
3015 valist = fold (build1 (ADDR_EXPR, pt, valist));
3016 TREE_SIDE_EFFECTS (valist) = 1;
3019 if (TREE_SIDE_EFFECTS (valist))
3020 valist = save_expr (valist);
3021 valist = fold (build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (valist)),
3028 /* The "standard" implementation of va_start: just assign `nextarg' to
3032 std_expand_builtin_va_start (valist, nextarg)
3038 t = build (MODIFY_EXPR, TREE_TYPE (valist), valist,
3039 make_tree (ptr_type_node, nextarg));
3040 TREE_SIDE_EFFECTS (t) = 1;
3042 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
3045 /* Expand ARGLIST, from a call to __builtin_va_start. */
3048 expand_builtin_va_start (arglist)
3054 chain = TREE_CHAIN (arglist);
3056 if (TREE_CHAIN (chain))
3057 error ("too many arguments to function `va_start'");
3059 nextarg = expand_builtin_next_arg (chain);
3060 valist = stabilize_va_list (TREE_VALUE (arglist), 1);
3062 #ifdef EXPAND_BUILTIN_VA_START
3063 EXPAND_BUILTIN_VA_START (valist, nextarg);
3065 std_expand_builtin_va_start (valist, nextarg);
3071 /* The "standard" implementation of va_arg: read the value from the
3072 current (padded) address and increment by the (padded) size. */
3075 std_expand_builtin_va_arg (valist, type)
3078 tree addr_tree, t, type_size = NULL;
3079 tree align, alignm1;
3083 /* Compute the rounded size of the type. */
3084 align = size_int (PARM_BOUNDARY / BITS_PER_UNIT);
3085 alignm1 = size_int (PARM_BOUNDARY / BITS_PER_UNIT - 1);
3086 if (type == error_mark_node
3087 || (type_size = TYPE_SIZE_UNIT (TYPE_MAIN_VARIANT (type))) == NULL
3088 || TREE_OVERFLOW (type_size))
3089 rounded_size = size_zero_node;
3091 rounded_size = fold (build (MULT_EXPR, sizetype,
3092 fold (build (TRUNC_DIV_EXPR, sizetype,
3093 fold (build (PLUS_EXPR, sizetype,
3094 type_size, alignm1)),
3100 if (PAD_VARARGS_DOWN && ! integer_zerop (rounded_size))
3102 /* Small args are padded downward. */
3103 addr_tree = fold (build (PLUS_EXPR, TREE_TYPE (addr_tree), addr_tree,
3104 fold (build (COND_EXPR, sizetype,
3105 fold (build (GT_EXPR, sizetype,
3109 fold (build (MINUS_EXPR, sizetype,
3114 addr = expand_expr (addr_tree, NULL_RTX, Pmode, EXPAND_NORMAL);
3115 addr = copy_to_reg (addr);
3117 /* Compute new value for AP. */
3118 if (! integer_zerop (rounded_size))
3120 t = build (MODIFY_EXPR, TREE_TYPE (valist), valist,
3121 build (PLUS_EXPR, TREE_TYPE (valist), valist,
3123 TREE_SIDE_EFFECTS (t) = 1;
3124 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
3130 /* Expand __builtin_va_arg, which is not really a builtin function, but
3131 a very special sort of operator. */
3134 expand_builtin_va_arg (valist, type)
3138 tree promoted_type, want_va_type, have_va_type;
3140 /* Verify that valist is of the proper type. */
3142 want_va_type = va_list_type_node;
3143 have_va_type = TREE_TYPE (valist);
3144 if (TREE_CODE (want_va_type) == ARRAY_TYPE)
3146 /* If va_list is an array type, the argument may have decayed
3147 to a pointer type, e.g. by being passed to another function.
3148 In that case, unwrap both types so that we can compare the
3149 underlying records. */
3150 if (TREE_CODE (have_va_type) == ARRAY_TYPE
3151 || TREE_CODE (have_va_type) == POINTER_TYPE)
3153 want_va_type = TREE_TYPE (want_va_type);
3154 have_va_type = TREE_TYPE (have_va_type);
3157 if (TYPE_MAIN_VARIANT (want_va_type) != TYPE_MAIN_VARIANT (have_va_type))
3159 error ("first argument to `va_arg' not of type `va_list'");
3163 /* Generate a diagnostic for requesting data of a type that cannot
3164 be passed through `...' due to type promotion at the call site. */
3165 else if ((promoted_type = (*lang_hooks.types.type_promotes_to) (type))
3168 const char *name = "<anonymous type>", *pname = 0;
3169 static bool gave_help;
3171 if (TYPE_NAME (type))
3173 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
3174 name = IDENTIFIER_POINTER (TYPE_NAME (type));
3175 else if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
3176 && DECL_NAME (TYPE_NAME (type)))
3177 name = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type)));
3179 if (TYPE_NAME (promoted_type))
3181 if (TREE_CODE (TYPE_NAME (promoted_type)) == IDENTIFIER_NODE)
3182 pname = IDENTIFIER_POINTER (TYPE_NAME (promoted_type));
3183 else if (TREE_CODE (TYPE_NAME (promoted_type)) == TYPE_DECL
3184 && DECL_NAME (TYPE_NAME (promoted_type)))
3185 pname = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (promoted_type)));
3188 /* Unfortunately, this is merely undefined, rather than a constraint
3189 violation, so we cannot make this an error. If this call is never
3190 executed, the program is still strictly conforming. */
3191 warning ("`%s' is promoted to `%s' when passed through `...'",
3196 warning ("(so you should pass `%s' not `%s' to `va_arg')",
3200 /* We can, however, treat "undefined" any way we please.
3201 Call abort to encourage the user to fix the program. */
3202 expand_builtin_trap ();
3204 /* This is dead code, but go ahead and finish so that the
3205 mode of the result comes out right. */
3210 /* Make it easier for the backends by protecting the valist argument
3211 from multiple evaluations. */
3212 valist = stabilize_va_list (valist, 0);
3214 #ifdef EXPAND_BUILTIN_VA_ARG
3215 addr = EXPAND_BUILTIN_VA_ARG (valist, type);
3217 addr = std_expand_builtin_va_arg (valist, type);
3221 #ifdef POINTERS_EXTEND_UNSIGNED
3222 if (GET_MODE (addr) != Pmode)
3223 addr = convert_memory_address (Pmode, addr);
3226 result = gen_rtx_MEM (TYPE_MODE (type), addr);
3227 set_mem_alias_set (result, get_varargs_alias_set ());
3232 /* Expand ARGLIST, from a call to __builtin_va_end. */
3235 expand_builtin_va_end (arglist)
3238 tree valist = TREE_VALUE (arglist);
3240 #ifdef EXPAND_BUILTIN_VA_END
3241 valist = stabilize_va_list (valist, 0);
3242 EXPAND_BUILTIN_VA_END(arglist);
3244 /* Evaluate for side effects, if needed. I hate macros that don't
3246 if (TREE_SIDE_EFFECTS (valist))
3247 expand_expr (valist, const0_rtx, VOIDmode, EXPAND_NORMAL);
3253 /* Expand ARGLIST, from a call to __builtin_va_copy. We do this as a
3254 builtin rather than just as an assignment in stdarg.h because of the
3255 nastiness of array-type va_list types. */
3258 expand_builtin_va_copy (arglist)
3263 dst = TREE_VALUE (arglist);
3264 src = TREE_VALUE (TREE_CHAIN (arglist));
3266 dst = stabilize_va_list (dst, 1);
3267 src = stabilize_va_list (src, 0);
3269 if (TREE_CODE (va_list_type_node) != ARRAY_TYPE)
3271 t = build (MODIFY_EXPR, va_list_type_node, dst, src);
3272 TREE_SIDE_EFFECTS (t) = 1;
3273 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
3277 rtx dstb, srcb, size;
3279 /* Evaluate to pointers. */
3280 dstb = expand_expr (dst, NULL_RTX, Pmode, EXPAND_NORMAL);
3281 srcb = expand_expr (src, NULL_RTX, Pmode, EXPAND_NORMAL);
3282 size = expand_expr (TYPE_SIZE_UNIT (va_list_type_node), NULL_RTX,
3283 VOIDmode, EXPAND_NORMAL);
3285 #ifdef POINTERS_EXTEND_UNSIGNED
3286 if (GET_MODE (dstb) != Pmode)
3287 dstb = convert_memory_address (Pmode, dstb);
3289 if (GET_MODE (srcb) != Pmode)
3290 srcb = convert_memory_address (Pmode, srcb);
3293 /* "Dereference" to BLKmode memories. */
3294 dstb = gen_rtx_MEM (BLKmode, dstb);
3295 set_mem_alias_set (dstb, get_alias_set (TREE_TYPE (TREE_TYPE (dst))));
3296 set_mem_align (dstb, TYPE_ALIGN (va_list_type_node));
3297 srcb = gen_rtx_MEM (BLKmode, srcb);
3298 set_mem_alias_set (srcb, get_alias_set (TREE_TYPE (TREE_TYPE (src))));
3299 set_mem_align (srcb, TYPE_ALIGN (va_list_type_node));
3302 emit_block_move (dstb, srcb, size, BLOCK_OP_NORMAL);
3308 /* Expand a call to one of the builtin functions __builtin_frame_address or
3309 __builtin_return_address. */
3312 expand_builtin_frame_address (exp)
3315 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
3316 tree arglist = TREE_OPERAND (exp, 1);
3318 /* The argument must be a nonnegative integer constant.
3319 It counts the number of frames to scan up the stack.
3320 The value is the return address saved in that frame. */
3322 /* Warning about missing arg was already issued. */
3324 else if (! host_integerp (TREE_VALUE (arglist), 1))
3326 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
3327 error ("invalid arg to `__builtin_frame_address'");
3329 error ("invalid arg to `__builtin_return_address'");
3335 = expand_builtin_return_addr (DECL_FUNCTION_CODE (fndecl),
3336 tree_low_cst (TREE_VALUE (arglist), 1),
3337 hard_frame_pointer_rtx);
3339 /* Some ports cannot access arbitrary stack frames. */
3342 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
3343 warning ("unsupported arg to `__builtin_frame_address'");
3345 warning ("unsupported arg to `__builtin_return_address'");
3349 /* For __builtin_frame_address, return what we've got. */
3350 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
3353 if (GET_CODE (tem) != REG
3354 && ! CONSTANT_P (tem))
3355 tem = copy_to_mode_reg (Pmode, tem);
3360 /* Expand a call to the alloca builtin, with arguments ARGLIST. Return 0 if
3361 we failed and the caller should emit a normal call, otherwise try to get
3362 the result in TARGET, if convenient. */
3365 expand_builtin_alloca (arglist, target)
3372 if (!validate_arglist (arglist, INTEGER_TYPE, VOID_TYPE))
3375 /* Compute the argument. */
3376 op0 = expand_expr (TREE_VALUE (arglist), NULL_RTX, VOIDmode, 0);
3378 /* Allocate the desired space. */
3379 result = allocate_dynamic_stack_space (op0, target, BITS_PER_UNIT);
3381 #ifdef POINTERS_EXTEND_UNSIGNED
3382 if (GET_MODE (result) != ptr_mode)
3383 result = convert_memory_address (ptr_mode, result);
3389 /* Expand a call to the ffs builtin. The arguments are in ARGLIST.
3390 Return 0 if a normal call should be emitted rather than expanding the
3391 function in-line. If convenient, the result should be placed in TARGET.
3392 SUBTARGET may be used as the target for computing one of EXP's operands. */
3395 expand_builtin_ffs (arglist, target, subtarget)
3397 rtx target, subtarget;
3400 if (!validate_arglist (arglist, INTEGER_TYPE, VOID_TYPE))
3403 /* Compute the argument. */
3404 op0 = expand_expr (TREE_VALUE (arglist), subtarget, VOIDmode, 0);
3405 /* Compute ffs, into TARGET if possible.
3406 Set TARGET to wherever the result comes back. */
3407 target = expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist))),
3408 ffs_optab, op0, target, 1);
3414 /* If the string passed to fputs is a constant and is one character
3415 long, we attempt to transform this call into __builtin_fputc(). */
3418 expand_builtin_fputs (arglist, ignore, unlocked)
3424 tree fn_fputc = unlocked ? built_in_decls[BUILT_IN_FPUTC_UNLOCKED]
3425 : built_in_decls[BUILT_IN_FPUTC];
3426 tree fn_fwrite = unlocked ? built_in_decls[BUILT_IN_FWRITE_UNLOCKED]
3427 : built_in_decls[BUILT_IN_FWRITE];
3429 /* If the return value is used, or the replacement _DECL isn't
3430 initialized, don't do the transformation. */
3431 if (!ignore || !fn_fputc || !fn_fwrite)
3434 /* Verify the arguments in the original call. */
3435 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
3438 /* Get the length of the string passed to fputs. If the length
3439 can't be determined, punt. */
3440 if (!(len = c_strlen (TREE_VALUE (arglist)))
3441 || TREE_CODE (len) != INTEGER_CST)
3444 switch (compare_tree_int (len, 1))
3446 case -1: /* length is 0, delete the call entirely . */
3448 /* Evaluate and ignore the argument in case it has
3450 expand_expr (TREE_VALUE (TREE_CHAIN (arglist)), const0_rtx,
3451 VOIDmode, EXPAND_NORMAL);
3454 case 0: /* length is 1, call fputc. */
3456 const char *p = c_getstr (TREE_VALUE (arglist));
3460 /* New argument list transforming fputs(string, stream) to
3461 fputc(string[0], stream). */
3463 build_tree_list (NULL_TREE, TREE_VALUE (TREE_CHAIN (arglist)));
3465 tree_cons (NULL_TREE, build_int_2 (p[0], 0), arglist);
3471 case 1: /* length is greater than 1, call fwrite. */
3473 tree string_arg = TREE_VALUE (arglist);
3475 /* New argument list transforming fputs(string, stream) to
3476 fwrite(string, 1, len, stream). */
3477 arglist = build_tree_list (NULL_TREE, TREE_VALUE (TREE_CHAIN (arglist)));
3478 arglist = tree_cons (NULL_TREE, len, arglist);
3479 arglist = tree_cons (NULL_TREE, size_one_node, arglist);
3480 arglist = tree_cons (NULL_TREE, string_arg, arglist);
3488 return expand_expr (build_function_call_expr (fn, arglist),
3489 (ignore ? const0_rtx : NULL_RTX),
3490 VOIDmode, EXPAND_NORMAL);
3493 /* Expand a call to __builtin_expect. We return our argument and emit a
3494 NOTE_INSN_EXPECTED_VALUE note. This is the expansion of __builtin_expect in
3495 a non-jump context. */
3498 expand_builtin_expect (arglist, target)
3505 if (arglist == NULL_TREE
3506 || TREE_CHAIN (arglist) == NULL_TREE)
3508 exp = TREE_VALUE (arglist);
3509 c = TREE_VALUE (TREE_CHAIN (arglist));
3511 if (TREE_CODE (c) != INTEGER_CST)
3513 error ("second arg to `__builtin_expect' must be a constant");
3514 c = integer_zero_node;
3517 target = expand_expr (exp, target, VOIDmode, EXPAND_NORMAL);
3519 /* Don't bother with expected value notes for integral constants. */
3520 if (GET_CODE (target) != CONST_INT)
3522 /* We do need to force this into a register so that we can be
3523 moderately sure to be able to correctly interpret the branch
3525 target = force_reg (GET_MODE (target), target);
3527 rtx_c = expand_expr (c, NULL_RTX, GET_MODE (target), EXPAND_NORMAL);
3529 note = emit_note (NULL, NOTE_INSN_EXPECTED_VALUE);
3530 NOTE_EXPECTED_VALUE (note) = gen_rtx_EQ (VOIDmode, target, rtx_c);
3536 /* Like expand_builtin_expect, except do this in a jump context. This is
3537 called from do_jump if the conditional is a __builtin_expect. Return either
3538 a list of insns to emit the jump or NULL if we cannot optimize
3539 __builtin_expect. We need to optimize this at jump time so that machines
3540 like the PowerPC don't turn the test into a SCC operation, and then jump
3541 based on the test being 0/1. */
3544 expand_builtin_expect_jump (exp, if_false_label, if_true_label)
3549 tree arglist = TREE_OPERAND (exp, 1);
3550 tree arg0 = TREE_VALUE (arglist);
3551 tree arg1 = TREE_VALUE (TREE_CHAIN (arglist));
3554 /* Only handle __builtin_expect (test, 0) and
3555 __builtin_expect (test, 1). */
3556 if (TREE_CODE (TREE_TYPE (arg1)) == INTEGER_TYPE
3557 && (integer_zerop (arg1) || integer_onep (arg1)))
3562 /* If we fail to locate an appropriate conditional jump, we'll
3563 fall back to normal evaluation. Ensure that the expression
3564 can be re-evaluated. */
3565 switch (unsafe_for_reeval (arg0))
3570 case 1: /* Mildly unsafe. */
3571 arg0 = unsave_expr (arg0);
3574 case 2: /* Wildly unsafe. */
3578 /* Expand the jump insns. */
3580 do_jump (arg0, if_false_label, if_true_label);
3584 /* Now that the __builtin_expect has been validated, go through and add
3585 the expect's to each of the conditional jumps. If we run into an
3586 error, just give up and generate the 'safe' code of doing a SCC
3587 operation and then doing a branch on that. */
3589 while (insn != NULL_RTX)
3591 rtx next = NEXT_INSN (insn);
3594 if (GET_CODE (insn) == JUMP_INSN && any_condjump_p (insn)
3595 && (pattern = pc_set (insn)) != NULL_RTX)
3597 rtx ifelse = SET_SRC (pattern);
3601 if (GET_CODE (ifelse) != IF_THEN_ELSE)
3604 if (GET_CODE (XEXP (ifelse, 1)) == LABEL_REF)
3607 label = XEXP (XEXP (ifelse, 1), 0);
3609 /* An inverted jump reverses the probabilities. */
3610 else if (GET_CODE (XEXP (ifelse, 2)) == LABEL_REF)
3613 label = XEXP (XEXP (ifelse, 2), 0);
3615 /* We shouldn't have to worry about conditional returns during
3616 the expansion stage, but handle it gracefully anyway. */
3617 else if (GET_CODE (XEXP (ifelse, 1)) == RETURN)
3622 /* An inverted return reverses the probabilities. */
3623 else if (GET_CODE (XEXP (ifelse, 2)) == RETURN)
3631 /* If the test is expected to fail, reverse the
3633 if (integer_zerop (arg1))
3636 /* If we are jumping to the false label, reverse the
3638 if (label == NULL_RTX)
3639 ; /* conditional return */
3640 else if (label == if_false_label)
3642 else if (label != if_true_label)
3646 predict_insn_def (insn, PRED_BUILTIN_EXPECT, taken);
3653 /* If no jumps were modified, fail and do __builtin_expect the normal
3663 expand_builtin_trap ()
3667 emit_insn (gen_trap ());
3670 emit_library_call (abort_libfunc, LCT_NORETURN, VOIDmode, 0);
3674 /* Expand an expression EXP that calls a built-in function,
3675 with result going to TARGET if that's convenient
3676 (and in mode MODE if that's convenient).
3677 SUBTARGET may be used as the target for computing one of EXP's operands.
3678 IGNORE is nonzero if the value is to be ignored. */
3681 expand_builtin (exp, target, subtarget, mode, ignore)
3685 enum machine_mode mode;
3688 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
3689 tree arglist = TREE_OPERAND (exp, 1);
3690 enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
3692 if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_MD)
3693 return (*targetm.expand_builtin) (exp, target, subtarget, mode, ignore);
3695 /* When not optimizing, generate calls to library functions for a certain
3697 if (!optimize && !CALLED_AS_BUILT_IN (fndecl))
3701 case BUILT_IN_SQRTF:
3702 case BUILT_IN_SQRTL:
3712 case BUILT_IN_MEMSET:
3713 case BUILT_IN_MEMCPY:
3714 case BUILT_IN_MEMCMP:
3716 case BUILT_IN_BZERO:
3717 case BUILT_IN_INDEX:
3718 case BUILT_IN_RINDEX:
3719 case BUILT_IN_STRCHR:
3720 case BUILT_IN_STRRCHR:
3721 case BUILT_IN_STRLEN:
3722 case BUILT_IN_STRCPY:
3723 case BUILT_IN_STRNCPY:
3724 case BUILT_IN_STRNCMP:
3725 case BUILT_IN_STRSTR:
3726 case BUILT_IN_STRPBRK:
3727 case BUILT_IN_STRCAT:
3728 case BUILT_IN_STRNCAT:
3729 case BUILT_IN_STRSPN:
3730 case BUILT_IN_STRCSPN:
3731 case BUILT_IN_STRCMP:
3733 case BUILT_IN_PUTCHAR:
3735 case BUILT_IN_PRINTF:
3736 case BUILT_IN_FPUTC:
3737 case BUILT_IN_FPUTS:
3738 case BUILT_IN_FWRITE:
3739 case BUILT_IN_PUTCHAR_UNLOCKED:
3740 case BUILT_IN_PUTS_UNLOCKED:
3741 case BUILT_IN_PRINTF_UNLOCKED:
3742 case BUILT_IN_FPUTC_UNLOCKED:
3743 case BUILT_IN_FPUTS_UNLOCKED:
3744 case BUILT_IN_FWRITE_UNLOCKED:
3745 return expand_call (exp, target, ignore);
3755 case BUILT_IN_LLABS:
3756 case BUILT_IN_IMAXABS:
3758 case BUILT_IN_FABSF:
3759 case BUILT_IN_FABSL:
3760 /* build_function_call changes these into ABS_EXPR. */
3764 case BUILT_IN_CONJF:
3765 case BUILT_IN_CONJL:
3766 case BUILT_IN_CREAL:
3767 case BUILT_IN_CREALF:
3768 case BUILT_IN_CREALL:
3769 case BUILT_IN_CIMAG:
3770 case BUILT_IN_CIMAGF:
3771 case BUILT_IN_CIMAGL:
3772 /* expand_tree_builtin changes these into CONJ_EXPR, REALPART_EXPR
3773 and IMAGPART_EXPR. */
3788 /* Treat these like sqrt only if unsafe math optimizations are allowed,
3789 because of possible accuracy problems. */
3790 if (! flag_unsafe_math_optimizations)
3793 case BUILT_IN_SQRTF:
3794 case BUILT_IN_SQRTL:
3795 target = expand_builtin_mathfn (exp, target, subtarget);
3800 case BUILT_IN_APPLY_ARGS:
3801 return expand_builtin_apply_args ();
3803 /* __builtin_apply (FUNCTION, ARGUMENTS, ARGSIZE) invokes
3804 FUNCTION with a copy of the parameters described by
3805 ARGUMENTS, and ARGSIZE. It returns a block of memory
3806 allocated on the stack into which is stored all the registers
3807 that might possibly be used for returning the result of a
3808 function. ARGUMENTS is the value returned by
3809 __builtin_apply_args. ARGSIZE is the number of bytes of
3810 arguments that must be copied. ??? How should this value be
3811 computed? We'll also need a safe worst case value for varargs
3813 case BUILT_IN_APPLY:
3814 if (!validate_arglist (arglist, POINTER_TYPE,
3815 POINTER_TYPE, INTEGER_TYPE, VOID_TYPE)
3816 && !validate_arglist (arglist, REFERENCE_TYPE,
3817 POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
3825 for (t = arglist, i = 0; t; t = TREE_CHAIN (t), i++)
3826 ops[i] = expand_expr (TREE_VALUE (t), NULL_RTX, VOIDmode, 0);
3828 return expand_builtin_apply (ops[0], ops[1], ops[2]);
3831 /* __builtin_return (RESULT) causes the function to return the
3832 value described by RESULT. RESULT is address of the block of
3833 memory returned by __builtin_apply. */
3834 case BUILT_IN_RETURN:
3835 if (validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
3836 expand_builtin_return (expand_expr (TREE_VALUE (arglist),
3837 NULL_RTX, VOIDmode, 0));
3840 case BUILT_IN_SAVEREGS:
3841 return expand_builtin_saveregs ();
3843 case BUILT_IN_ARGS_INFO:
3844 return expand_builtin_args_info (exp);
3846 /* Return the address of the first anonymous stack arg. */
3847 case BUILT_IN_NEXT_ARG:
3848 return expand_builtin_next_arg (arglist);
3850 case BUILT_IN_CLASSIFY_TYPE:
3851 return expand_builtin_classify_type (arglist);
3853 case BUILT_IN_CONSTANT_P:
3854 return expand_builtin_constant_p (exp);
3856 case BUILT_IN_FRAME_ADDRESS:
3857 case BUILT_IN_RETURN_ADDRESS:
3858 return expand_builtin_frame_address (exp);
3860 /* Returns the address of the area where the structure is returned.
3862 case BUILT_IN_AGGREGATE_INCOMING_ADDRESS:
3864 || ! AGGREGATE_TYPE_P (TREE_TYPE (TREE_TYPE (current_function_decl)))
3865 || GET_CODE (DECL_RTL (DECL_RESULT (current_function_decl))) != MEM)
3868 return XEXP (DECL_RTL (DECL_RESULT (current_function_decl)), 0);
3870 case BUILT_IN_ALLOCA:
3871 target = expand_builtin_alloca (arglist, target);
3877 target = expand_builtin_ffs (arglist, target, subtarget);
3882 case BUILT_IN_STRLEN:
3883 target = expand_builtin_strlen (exp, target);
3888 case BUILT_IN_STRCPY:
3889 target = expand_builtin_strcpy (exp, target, mode);
3894 case BUILT_IN_STRNCPY:
3895 target = expand_builtin_strncpy (arglist, target, mode);
3900 case BUILT_IN_STRCAT:
3901 target = expand_builtin_strcat (arglist, target, mode);
3906 case BUILT_IN_STRNCAT:
3907 target = expand_builtin_strncat (arglist, target, mode);
3912 case BUILT_IN_STRSPN:
3913 target = expand_builtin_strspn (arglist, target, mode);
3918 case BUILT_IN_STRCSPN:
3919 target = expand_builtin_strcspn (arglist, target, mode);
3924 case BUILT_IN_STRSTR:
3925 target = expand_builtin_strstr (arglist, target, mode);
3930 case BUILT_IN_STRPBRK:
3931 target = expand_builtin_strpbrk (arglist, target, mode);
3936 case BUILT_IN_INDEX:
3937 case BUILT_IN_STRCHR:
3938 target = expand_builtin_strchr (arglist, target, mode);
3943 case BUILT_IN_RINDEX:
3944 case BUILT_IN_STRRCHR:
3945 target = expand_builtin_strrchr (arglist, target, mode);
3950 case BUILT_IN_MEMCPY:
3951 target = expand_builtin_memcpy (arglist, target, mode);
3956 case BUILT_IN_MEMSET:
3957 target = expand_builtin_memset (exp, target, mode);
3962 case BUILT_IN_BZERO:
3963 target = expand_builtin_bzero (exp);
3968 case BUILT_IN_STRCMP:
3969 target = expand_builtin_strcmp (exp, target, mode);
3974 case BUILT_IN_STRNCMP:
3975 target = expand_builtin_strncmp (exp, target, mode);
3981 case BUILT_IN_MEMCMP:
3982 target = expand_builtin_memcmp (exp, arglist, target, mode);
3987 case BUILT_IN_SETJMP:
3988 target = expand_builtin_setjmp (arglist, target);
3993 /* __builtin_longjmp is passed a pointer to an array of five words.
3994 It's similar to the C library longjmp function but works with
3995 __builtin_setjmp above. */
3996 case BUILT_IN_LONGJMP:
3997 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
4001 rtx buf_addr = expand_expr (TREE_VALUE (arglist), subtarget,
4003 rtx value = expand_expr (TREE_VALUE (TREE_CHAIN (arglist)),
4004 NULL_RTX, VOIDmode, 0);
4006 if (value != const1_rtx)
4008 error ("__builtin_longjmp second argument must be 1");
4012 expand_builtin_longjmp (buf_addr, value);
4017 expand_builtin_trap ();
4020 case BUILT_IN_FPUTS:
4021 target = expand_builtin_fputs (arglist, ignore,/*unlocked=*/ 0);
4025 case BUILT_IN_FPUTS_UNLOCKED:
4026 target = expand_builtin_fputs (arglist, ignore,/*unlocked=*/ 1);
4031 /* Various hooks for the DWARF 2 __throw routine. */
4032 case BUILT_IN_UNWIND_INIT:
4033 expand_builtin_unwind_init ();
4035 case BUILT_IN_DWARF_CFA:
4036 return virtual_cfa_rtx;
4037 #ifdef DWARF2_UNWIND_INFO
4038 case BUILT_IN_DWARF_FP_REGNUM:
4039 return expand_builtin_dwarf_fp_regnum ();
4040 case BUILT_IN_INIT_DWARF_REG_SIZES:
4041 expand_builtin_init_dwarf_reg_sizes (TREE_VALUE (arglist));
4044 case BUILT_IN_FROB_RETURN_ADDR:
4045 return expand_builtin_frob_return_addr (TREE_VALUE (arglist));
4046 case BUILT_IN_EXTRACT_RETURN_ADDR:
4047 return expand_builtin_extract_return_addr (TREE_VALUE (arglist));
4048 case BUILT_IN_EH_RETURN:
4049 expand_builtin_eh_return (TREE_VALUE (arglist),
4050 TREE_VALUE (TREE_CHAIN (arglist)));
4052 #ifdef EH_RETURN_DATA_REGNO
4053 case BUILT_IN_EH_RETURN_DATA_REGNO:
4054 return expand_builtin_eh_return_data_regno (arglist);
4056 case BUILT_IN_VA_START:
4057 case BUILT_IN_STDARG_START:
4058 return expand_builtin_va_start (arglist);
4059 case BUILT_IN_VA_END:
4060 return expand_builtin_va_end (arglist);
4061 case BUILT_IN_VA_COPY:
4062 return expand_builtin_va_copy (arglist);
4063 case BUILT_IN_EXPECT:
4064 return expand_builtin_expect (arglist, target);
4065 case BUILT_IN_PREFETCH:
4066 expand_builtin_prefetch (arglist);
4070 default: /* just do library call, if unknown builtin */
4071 if (!DECL_ASSEMBLER_NAME_SET_P (fndecl))
4072 error ("built-in function `%s' not currently supported",
4073 IDENTIFIER_POINTER (DECL_NAME (fndecl)));
4076 /* The switch statement above can drop through to cause the function
4077 to be called normally. */
4078 return expand_call (exp, target, ignore);
4081 /* Fold a call to __builtin_constant_p, if we know it will evaluate to a
4082 constant. ARGLIST is the argument list of the call. */
4085 fold_builtin_constant_p (arglist)
4091 arglist = TREE_VALUE (arglist);
4093 /* We return 1 for a numeric type that's known to be a constant
4094 value at compile-time or for an aggregate type that's a
4095 literal constant. */
4096 STRIP_NOPS (arglist);
4098 /* If we know this is a constant, emit the constant of one. */
4099 if (TREE_CODE_CLASS (TREE_CODE (arglist)) == 'c'
4100 || (TREE_CODE (arglist) == CONSTRUCTOR
4101 && TREE_CONSTANT (arglist))
4102 || (TREE_CODE (arglist) == ADDR_EXPR
4103 && TREE_CODE (TREE_OPERAND (arglist, 0)) == STRING_CST))
4104 return integer_one_node;
4106 /* If we aren't going to be running CSE or this expression
4107 has side effects, show we don't know it to be a constant.
4108 Likewise if it's a pointer or aggregate type since in those
4109 case we only want literals, since those are only optimized
4110 when generating RTL, not later.
4111 And finally, if we are compiling an initializer, not code, we
4112 need to return a definite result now; there's not going to be any
4113 more optimization done. */
4114 if (TREE_SIDE_EFFECTS (arglist) || cse_not_expected
4115 || AGGREGATE_TYPE_P (TREE_TYPE (arglist))
4116 || POINTER_TYPE_P (TREE_TYPE (arglist))
4118 return integer_zero_node;
4123 /* Fold a call to __builtin_classify_type. */
4126 fold_builtin_classify_type (arglist)
4130 return build_int_2 (no_type_class, 0);
4132 return build_int_2 (type_to_class (TREE_TYPE (TREE_VALUE (arglist))), 0);
4135 /* Used by constant folding to eliminate some builtin calls early. EXP is
4136 the CALL_EXPR of a call to a builtin function. */
4142 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
4143 tree arglist = TREE_OPERAND (exp, 1);
4144 enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
4146 if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_MD)
4151 case BUILT_IN_CONSTANT_P:
4152 return fold_builtin_constant_p (arglist);
4154 case BUILT_IN_CLASSIFY_TYPE:
4155 return fold_builtin_classify_type (arglist);
4157 case BUILT_IN_STRLEN:
4158 if (validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
4160 tree len = c_strlen (TREE_VALUE (arglist));
4174 build_function_call_expr (fn, arglist)
4179 call_expr = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (fn)), fn);
4180 call_expr = build (CALL_EXPR, TREE_TYPE (TREE_TYPE (fn)),
4181 call_expr, arglist);
4182 TREE_SIDE_EFFECTS (call_expr) = 1;
4183 return fold (call_expr);
4186 /* This function validates the types of a function call argument list
4187 represented as a tree chain of parameters against a specified list
4188 of tree_codes. If the last specifier is a 0, that represents an
4189 ellipses, otherwise the last specifier must be a VOID_TYPE. */
4192 validate_arglist VPARAMS ((tree arglist, ...))
4194 enum tree_code code;
4197 VA_OPEN (ap, arglist);
4198 VA_FIXEDARG (ap, tree, arglist);
4201 code = va_arg (ap, enum tree_code);
4205 /* This signifies an ellipses, any further arguments are all ok. */
4209 /* This signifies an endlink, if no arguments remain, return
4210 true, otherwise return false. */
4214 /* If no parameters remain or the parameter's code does not
4215 match the specified code, return false. Otherwise continue
4216 checking any remaining arguments. */
4217 if (arglist == 0 || code != TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))))
4221 arglist = TREE_CHAIN (arglist);
4224 /* We need gotos here since we can only have one VA_CLOSE in a
4232 /* Default version of target-specific builtin setup that does nothing. */
4235 default_init_builtins ()
4239 /* Default target-specific builtin expander that does nothing. */
4242 default_expand_builtin (exp, target, subtarget, mode, ignore)
4243 tree exp ATTRIBUTE_UNUSED;
4244 rtx target ATTRIBUTE_UNUSED;
4245 rtx subtarget ATTRIBUTE_UNUSED;
4246 enum machine_mode mode ATTRIBUTE_UNUSED;
4247 int ignore ATTRIBUTE_UNUSED;