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"
45 #define CALLED_AS_BUILT_IN(NODE) \
46 (!strncmp (IDENTIFIER_POINTER (DECL_NAME (NODE)), "__builtin_", 10))
48 /* Register mappings for target machines without register windows. */
49 #ifndef INCOMING_REGNO
50 #define INCOMING_REGNO(OUT) (OUT)
52 #ifndef OUTGOING_REGNO
53 #define OUTGOING_REGNO(IN) (IN)
56 #ifndef PAD_VARARGS_DOWN
57 #define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
60 /* Define the names of the builtin function types and codes. */
61 const char *const built_in_class_names[4]
62 = {"NOT_BUILT_IN", "BUILT_IN_FRONTEND", "BUILT_IN_MD", "BUILT_IN_NORMAL"};
64 #define DEF_BUILTIN(X, N, C, T, LT, B, F, NA) STRINGX(X),
65 const char *const built_in_names[(int) END_BUILTINS] =
67 #include "builtins.def"
71 /* Setup an array of _DECL trees, make sure each element is
72 initialized to NULL_TREE. */
73 tree built_in_decls[(int) END_BUILTINS];
75 tree (*lang_type_promotes_to) PARAMS ((tree));
77 static int get_pointer_alignment PARAMS ((tree, unsigned int));
78 static tree c_strlen PARAMS ((tree));
79 static const char *c_getstr PARAMS ((tree));
80 static rtx c_readstr PARAMS ((const char *,
82 static int target_char_cast PARAMS ((tree, char *));
83 static rtx get_memory_rtx PARAMS ((tree));
84 static int apply_args_size PARAMS ((void));
85 static int apply_result_size PARAMS ((void));
86 #if defined (HAVE_untyped_call) || defined (HAVE_untyped_return)
87 static rtx result_vector PARAMS ((int, rtx));
89 static rtx expand_builtin_setjmp PARAMS ((tree, rtx));
90 static void expand_builtin_prefetch PARAMS ((tree));
91 static rtx expand_builtin_apply_args PARAMS ((void));
92 static rtx expand_builtin_apply_args_1 PARAMS ((void));
93 static rtx expand_builtin_apply PARAMS ((rtx, rtx, rtx));
94 static void expand_builtin_return PARAMS ((rtx));
95 static enum type_class type_to_class PARAMS ((tree));
96 static rtx expand_builtin_classify_type PARAMS ((tree));
97 static rtx expand_builtin_mathfn PARAMS ((tree, rtx, rtx));
98 static rtx expand_builtin_constant_p PARAMS ((tree));
99 static rtx expand_builtin_args_info PARAMS ((tree));
100 static rtx expand_builtin_next_arg PARAMS ((tree));
101 static rtx expand_builtin_va_start PARAMS ((int, tree));
102 static rtx expand_builtin_va_end PARAMS ((tree));
103 static rtx expand_builtin_va_copy PARAMS ((tree));
104 static rtx expand_builtin_memcmp PARAMS ((tree, tree, rtx,
106 static rtx expand_builtin_strcmp PARAMS ((tree, rtx,
108 static rtx expand_builtin_strncmp PARAMS ((tree, rtx,
110 static rtx builtin_memcpy_read_str PARAMS ((PTR, HOST_WIDE_INT,
112 static rtx expand_builtin_strcat PARAMS ((tree, rtx,
114 static rtx expand_builtin_strncat PARAMS ((tree, rtx,
116 static rtx expand_builtin_strspn PARAMS ((tree, rtx,
118 static rtx expand_builtin_strcspn PARAMS ((tree, rtx,
120 static rtx expand_builtin_memcpy PARAMS ((tree, rtx,
122 static rtx expand_builtin_strcpy PARAMS ((tree, rtx,
124 static rtx builtin_strncpy_read_str PARAMS ((PTR, HOST_WIDE_INT,
126 static rtx expand_builtin_strncpy PARAMS ((tree, rtx,
128 static rtx builtin_memset_read_str PARAMS ((PTR, HOST_WIDE_INT,
130 static rtx expand_builtin_memset PARAMS ((tree, rtx,
132 static rtx expand_builtin_bzero PARAMS ((tree));
133 static rtx expand_builtin_strlen PARAMS ((tree, rtx));
134 static rtx expand_builtin_strstr PARAMS ((tree, rtx,
136 static rtx expand_builtin_strpbrk PARAMS ((tree, rtx,
138 static rtx expand_builtin_strchr PARAMS ((tree, rtx,
140 static rtx expand_builtin_strrchr PARAMS ((tree, rtx,
142 static rtx expand_builtin_alloca PARAMS ((tree, rtx));
143 static rtx expand_builtin_ffs PARAMS ((tree, rtx, rtx));
144 static rtx expand_builtin_frame_address PARAMS ((tree));
145 static rtx expand_builtin_fputs PARAMS ((tree, int, int));
146 static tree stabilize_va_list PARAMS ((tree, int));
147 static rtx expand_builtin_expect PARAMS ((tree, rtx));
148 static tree fold_builtin_constant_p PARAMS ((tree));
149 static tree fold_builtin_classify_type PARAMS ((tree));
150 static tree build_function_call_expr PARAMS ((tree, tree));
151 static int validate_arglist PARAMS ((tree, ...));
153 /* Return the alignment in bits of EXP, a pointer valued expression.
154 But don't return more than MAX_ALIGN no matter what.
155 The alignment returned is, by default, the alignment of the thing that
156 EXP points to. If it is not a POINTER_TYPE, 0 is returned.
158 Otherwise, look at the expression to see if we can do better, i.e., if the
159 expression is actually pointing at an object whose alignment is tighter. */
162 get_pointer_alignment (exp, max_align)
164 unsigned int max_align;
166 unsigned int align, inner;
168 if (TREE_CODE (TREE_TYPE (exp)) != POINTER_TYPE)
171 align = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp)));
172 align = MIN (align, max_align);
176 switch (TREE_CODE (exp))
180 case NON_LVALUE_EXPR:
181 exp = TREE_OPERAND (exp, 0);
182 if (TREE_CODE (TREE_TYPE (exp)) != POINTER_TYPE)
185 inner = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp)));
186 align = MIN (inner, max_align);
190 /* If sum of pointer + int, restrict our maximum alignment to that
191 imposed by the integer. If not, we can't do any better than
193 if (! host_integerp (TREE_OPERAND (exp, 1), 1))
196 while (((tree_low_cst (TREE_OPERAND (exp, 1), 1))
197 & (max_align / BITS_PER_UNIT - 1))
201 exp = TREE_OPERAND (exp, 0);
205 /* See what we are pointing at and look at its alignment. */
206 exp = TREE_OPERAND (exp, 0);
207 if (TREE_CODE (exp) == FUNCTION_DECL)
208 align = FUNCTION_BOUNDARY;
209 else if (DECL_P (exp))
210 align = DECL_ALIGN (exp);
211 #ifdef CONSTANT_ALIGNMENT
212 else if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'c')
213 align = CONSTANT_ALIGNMENT (exp, align);
215 return MIN (align, max_align);
223 /* Compute the length of a C string. TREE_STRING_LENGTH is not the right
224 way, because it could contain a zero byte in the middle.
225 TREE_STRING_LENGTH is the size of the character array, not the string.
227 The value returned is of type `ssizetype'.
229 Unfortunately, string_constant can't access the values of const char
230 arrays with initializers, so neither can we do so here. */
237 HOST_WIDE_INT offset;
241 src = string_constant (src, &offset_node);
245 max = TREE_STRING_LENGTH (src) - 1;
246 ptr = TREE_STRING_POINTER (src);
248 if (offset_node && TREE_CODE (offset_node) != INTEGER_CST)
250 /* If the string has an internal zero byte (e.g., "foo\0bar"), we can't
251 compute the offset to the following null if we don't know where to
252 start searching for it. */
255 for (i = 0; i < max; i++)
259 /* We don't know the starting offset, but we do know that the string
260 has no internal zero bytes. We can assume that the offset falls
261 within the bounds of the string; otherwise, the programmer deserves
262 what he gets. Subtract the offset from the length of the string,
263 and return that. This would perhaps not be valid if we were dealing
264 with named arrays in addition to literal string constants. */
266 return size_diffop (size_int (max), offset_node);
269 /* We have a known offset into the string. Start searching there for
270 a null character if we can represent it as a single HOST_WIDE_INT. */
271 if (offset_node == 0)
273 else if (! host_integerp (offset_node, 0))
276 offset = tree_low_cst (offset_node, 0);
278 /* If the offset is known to be out of bounds, warn, and call strlen at
280 if (offset < 0 || offset > max)
282 warning ("offset outside bounds of constant string");
286 /* Use strlen to search for the first zero byte. Since any strings
287 constructed with build_string will have nulls appended, we win even
288 if we get handed something like (char[4])"abcd".
290 Since OFFSET is our starting index into the string, no further
291 calculation is needed. */
292 return ssize_int (strlen (ptr + offset));
295 /* Return a char pointer for a C string if it is a string constant
296 or sum of string constant and integer constant. */
304 src = string_constant (src, &offset_node);
308 if (offset_node == 0)
309 return TREE_STRING_POINTER (src);
310 else if (!host_integerp (offset_node, 1)
311 || compare_tree_int (offset_node, TREE_STRING_LENGTH (src) - 1) > 0)
314 return TREE_STRING_POINTER (src) + tree_low_cst (offset_node, 1);
317 /* Return a CONST_INT or CONST_DOUBLE corresponding to target reading
318 GET_MODE_BITSIZE (MODE) bits from string constant STR. */
321 c_readstr (str, mode)
323 enum machine_mode mode;
329 if (GET_MODE_CLASS (mode) != MODE_INT)
334 for (i = 0; i < GET_MODE_SIZE (mode); i++)
337 if (WORDS_BIG_ENDIAN)
338 j = GET_MODE_SIZE (mode) - i - 1;
339 if (BYTES_BIG_ENDIAN != WORDS_BIG_ENDIAN
340 && GET_MODE_SIZE (mode) > UNITS_PER_WORD)
341 j = j + UNITS_PER_WORD - 2 * (j % UNITS_PER_WORD) - 1;
343 if (j > 2 * HOST_BITS_PER_WIDE_INT)
346 ch = (unsigned char) str[i];
347 c[j / HOST_BITS_PER_WIDE_INT] |= ch << (j % HOST_BITS_PER_WIDE_INT);
349 return immed_double_const (c[0], c[1], mode);
352 /* Cast a target constant CST to target CHAR and if that value fits into
353 host char type, return zero and put that value into variable pointed by
357 target_char_cast (cst, p)
361 unsigned HOST_WIDE_INT val, hostval;
363 if (!host_integerp (cst, 1)
364 || CHAR_TYPE_SIZE > HOST_BITS_PER_WIDE_INT)
367 val = tree_low_cst (cst, 1);
368 if (CHAR_TYPE_SIZE < HOST_BITS_PER_WIDE_INT)
369 val &= (((unsigned HOST_WIDE_INT) 1) << CHAR_TYPE_SIZE) - 1;
372 if (HOST_BITS_PER_CHAR < HOST_BITS_PER_WIDE_INT)
373 hostval &= (((unsigned HOST_WIDE_INT) 1) << HOST_BITS_PER_CHAR) - 1;
382 /* Given TEM, a pointer to a stack frame, follow the dynamic chain COUNT
383 times to get the address of either a higher stack frame, or a return
384 address located within it (depending on FNDECL_CODE). */
387 expand_builtin_return_addr (fndecl_code, count, tem)
388 enum built_in_function fndecl_code;
394 /* Some machines need special handling before we can access
395 arbitrary frames. For example, on the sparc, we must first flush
396 all register windows to the stack. */
397 #ifdef SETUP_FRAME_ADDRESSES
399 SETUP_FRAME_ADDRESSES ();
402 /* On the sparc, the return address is not in the frame, it is in a
403 register. There is no way to access it off of the current frame
404 pointer, but it can be accessed off the previous frame pointer by
405 reading the value from the register window save area. */
406 #ifdef RETURN_ADDR_IN_PREVIOUS_FRAME
407 if (fndecl_code == BUILT_IN_RETURN_ADDRESS)
411 /* Scan back COUNT frames to the specified frame. */
412 for (i = 0; i < count; i++)
414 /* Assume the dynamic chain pointer is in the word that the
415 frame address points to, unless otherwise specified. */
416 #ifdef DYNAMIC_CHAIN_ADDRESS
417 tem = DYNAMIC_CHAIN_ADDRESS (tem);
419 tem = memory_address (Pmode, tem);
420 tem = gen_rtx_MEM (Pmode, tem);
421 set_mem_alias_set (tem, get_frame_alias_set ());
422 tem = copy_to_reg (tem);
425 /* For __builtin_frame_address, return what we've got. */
426 if (fndecl_code == BUILT_IN_FRAME_ADDRESS)
429 /* For __builtin_return_address, Get the return address from that
431 #ifdef RETURN_ADDR_RTX
432 tem = RETURN_ADDR_RTX (count, tem);
434 tem = memory_address (Pmode,
435 plus_constant (tem, GET_MODE_SIZE (Pmode)));
436 tem = gen_rtx_MEM (Pmode, tem);
437 set_mem_alias_set (tem, get_frame_alias_set ());
442 /* Alias set used for setjmp buffer. */
443 static HOST_WIDE_INT setjmp_alias_set = -1;
445 /* Construct the leading half of a __builtin_setjmp call. Control will
446 return to RECEIVER_LABEL. This is used directly by sjlj exception
450 expand_builtin_setjmp_setup (buf_addr, receiver_label)
454 enum machine_mode sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL);
458 if (setjmp_alias_set == -1)
459 setjmp_alias_set = new_alias_set ();
461 #ifdef POINTERS_EXTEND_UNSIGNED
462 if (GET_MODE (buf_addr) != Pmode)
463 buf_addr = convert_memory_address (Pmode, buf_addr);
466 buf_addr = force_reg (Pmode, force_operand (buf_addr, NULL_RTX));
470 /* We store the frame pointer and the address of receiver_label in
471 the buffer and use the rest of it for the stack save area, which
472 is machine-dependent. */
474 #ifndef BUILTIN_SETJMP_FRAME_VALUE
475 #define BUILTIN_SETJMP_FRAME_VALUE virtual_stack_vars_rtx
478 mem = gen_rtx_MEM (Pmode, buf_addr);
479 set_mem_alias_set (mem, setjmp_alias_set);
480 emit_move_insn (mem, BUILTIN_SETJMP_FRAME_VALUE);
482 mem = gen_rtx_MEM (Pmode, plus_constant (buf_addr, GET_MODE_SIZE (Pmode))),
483 set_mem_alias_set (mem, setjmp_alias_set);
485 emit_move_insn (validize_mem (mem),
486 force_reg (Pmode, gen_rtx_LABEL_REF (Pmode, receiver_label)));
488 stack_save = gen_rtx_MEM (sa_mode,
489 plus_constant (buf_addr,
490 2 * GET_MODE_SIZE (Pmode)));
491 set_mem_alias_set (stack_save, setjmp_alias_set);
492 emit_stack_save (SAVE_NONLOCAL, &stack_save, NULL_RTX);
494 /* If there is further processing to do, do it. */
495 #ifdef HAVE_builtin_setjmp_setup
496 if (HAVE_builtin_setjmp_setup)
497 emit_insn (gen_builtin_setjmp_setup (buf_addr));
500 /* Tell optimize_save_area_alloca that extra work is going to
501 need to go on during alloca. */
502 current_function_calls_setjmp = 1;
504 /* Set this so all the registers get saved in our frame; we need to be
505 able to copy the saved values for any registers from frames we unwind. */
506 current_function_has_nonlocal_label = 1;
509 /* Construct the trailing part of a __builtin_setjmp call.
510 This is used directly by sjlj exception handling code. */
513 expand_builtin_setjmp_receiver (receiver_label)
514 rtx receiver_label ATTRIBUTE_UNUSED;
516 /* Clobber the FP when we get here, so we have to make sure it's
517 marked as used by this function. */
518 emit_insn (gen_rtx_USE (VOIDmode, hard_frame_pointer_rtx));
520 /* Mark the static chain as clobbered here so life information
521 doesn't get messed up for it. */
522 emit_insn (gen_rtx_CLOBBER (VOIDmode, static_chain_rtx));
524 /* Now put in the code to restore the frame pointer, and argument
525 pointer, if needed. The code below is from expand_end_bindings
526 in stmt.c; see detailed documentation there. */
527 #ifdef HAVE_nonlocal_goto
528 if (! HAVE_nonlocal_goto)
530 emit_move_insn (virtual_stack_vars_rtx, hard_frame_pointer_rtx);
532 #if ARG_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM
533 if (fixed_regs[ARG_POINTER_REGNUM])
535 #ifdef ELIMINABLE_REGS
537 static const struct elims {const int from, to;} elim_regs[] = ELIMINABLE_REGS;
539 for (i = 0; i < ARRAY_SIZE (elim_regs); i++)
540 if (elim_regs[i].from == ARG_POINTER_REGNUM
541 && elim_regs[i].to == HARD_FRAME_POINTER_REGNUM)
544 if (i == ARRAY_SIZE (elim_regs))
547 /* Now restore our arg pointer from the address at which it
548 was saved in our stack frame. */
549 emit_move_insn (virtual_incoming_args_rtx,
550 copy_to_reg (get_arg_pointer_save_area (cfun)));
555 #ifdef HAVE_builtin_setjmp_receiver
556 if (HAVE_builtin_setjmp_receiver)
557 emit_insn (gen_builtin_setjmp_receiver (receiver_label));
560 #ifdef HAVE_nonlocal_goto_receiver
561 if (HAVE_nonlocal_goto_receiver)
562 emit_insn (gen_nonlocal_goto_receiver ());
567 /* @@@ This is a kludge. Not all machine descriptions define a blockage
568 insn, but we must not allow the code we just generated to be reordered
569 by scheduling. Specifically, the update of the frame pointer must
570 happen immediately, not later. So emit an ASM_INPUT to act as blockage
572 emit_insn (gen_rtx_ASM_INPUT (VOIDmode, ""));
575 /* __builtin_setjmp is passed a pointer to an array of five words (not
576 all will be used on all machines). It operates similarly to the C
577 library function of the same name, but is more efficient. Much of
578 the code below (and for longjmp) is copied from the handling of
581 NOTE: This is intended for use by GNAT and the exception handling
582 scheme in the compiler and will only work in the method used by
586 expand_builtin_setjmp (arglist, target)
590 rtx buf_addr, next_lab, cont_lab;
592 if (!validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
595 if (target == 0 || GET_CODE (target) != REG
596 || REGNO (target) < FIRST_PSEUDO_REGISTER)
597 target = gen_reg_rtx (TYPE_MODE (integer_type_node));
599 buf_addr = expand_expr (TREE_VALUE (arglist), NULL_RTX, VOIDmode, 0);
601 next_lab = gen_label_rtx ();
602 cont_lab = gen_label_rtx ();
604 expand_builtin_setjmp_setup (buf_addr, next_lab);
606 /* Set TARGET to zero and branch to the continue label. */
607 emit_move_insn (target, const0_rtx);
608 emit_jump_insn (gen_jump (cont_lab));
610 emit_label (next_lab);
612 expand_builtin_setjmp_receiver (next_lab);
614 /* Set TARGET to one. */
615 emit_move_insn (target, const1_rtx);
616 emit_label (cont_lab);
618 /* Tell flow about the strange goings on. Putting `next_lab' on
619 `nonlocal_goto_handler_labels' to indicates that function
620 calls may traverse the arc back to this label. */
622 current_function_has_nonlocal_label = 1;
623 nonlocal_goto_handler_labels
624 = gen_rtx_EXPR_LIST (VOIDmode, next_lab, nonlocal_goto_handler_labels);
629 /* __builtin_longjmp is passed a pointer to an array of five words (not
630 all will be used on all machines). It operates similarly to the C
631 library function of the same name, but is more efficient. Much of
632 the code below is copied from the handling of non-local gotos.
634 NOTE: This is intended for use by GNAT and the exception handling
635 scheme in the compiler and will only work in the method used by
639 expand_builtin_longjmp (buf_addr, value)
642 rtx fp, lab, stack, insn, last;
643 enum machine_mode sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL);
645 if (setjmp_alias_set == -1)
646 setjmp_alias_set = new_alias_set ();
648 #ifdef POINTERS_EXTEND_UNSIGNED
649 if (GET_MODE (buf_addr) != Pmode)
650 buf_addr = convert_memory_address (Pmode, buf_addr);
653 buf_addr = force_reg (Pmode, buf_addr);
655 /* We used to store value in static_chain_rtx, but that fails if pointers
656 are smaller than integers. We instead require that the user must pass
657 a second argument of 1, because that is what builtin_setjmp will
658 return. This also makes EH slightly more efficient, since we are no
659 longer copying around a value that we don't care about. */
660 if (value != const1_rtx)
663 current_function_calls_longjmp = 1;
665 last = get_last_insn ();
666 #ifdef HAVE_builtin_longjmp
667 if (HAVE_builtin_longjmp)
668 emit_insn (gen_builtin_longjmp (buf_addr));
672 fp = gen_rtx_MEM (Pmode, buf_addr);
673 lab = gen_rtx_MEM (Pmode, plus_constant (buf_addr,
674 GET_MODE_SIZE (Pmode)));
676 stack = gen_rtx_MEM (sa_mode, plus_constant (buf_addr,
677 2 * GET_MODE_SIZE (Pmode)));
678 set_mem_alias_set (fp, setjmp_alias_set);
679 set_mem_alias_set (lab, setjmp_alias_set);
680 set_mem_alias_set (stack, setjmp_alias_set);
682 /* Pick up FP, label, and SP from the block and jump. This code is
683 from expand_goto in stmt.c; see there for detailed comments. */
684 #if HAVE_nonlocal_goto
685 if (HAVE_nonlocal_goto)
686 /* We have to pass a value to the nonlocal_goto pattern that will
687 get copied into the static_chain pointer, but it does not matter
688 what that value is, because builtin_setjmp does not use it. */
689 emit_insn (gen_nonlocal_goto (value, lab, stack, fp));
693 lab = copy_to_reg (lab);
695 emit_move_insn (hard_frame_pointer_rtx, fp);
696 emit_stack_restore (SAVE_NONLOCAL, stack, NULL_RTX);
698 emit_insn (gen_rtx_USE (VOIDmode, hard_frame_pointer_rtx));
699 emit_insn (gen_rtx_USE (VOIDmode, stack_pointer_rtx));
700 emit_indirect_jump (lab);
704 /* Search backwards and mark the jump insn as a non-local goto.
705 Note that this precludes the use of __builtin_longjmp to a
706 __builtin_setjmp target in the same function. However, we've
707 already cautioned the user that these functions are for
708 internal exception handling use only. */
709 for (insn = get_last_insn (); insn; insn = PREV_INSN (insn))
713 if (GET_CODE (insn) == JUMP_INSN)
715 REG_NOTES (insn) = alloc_EXPR_LIST (REG_NON_LOCAL_GOTO, const0_rtx,
719 else if (GET_CODE (insn) == CALL_INSN)
724 /* Expand a call to __builtin_prefetch. For a target that does not support
725 data prefetch, evaluate the memory address argument in case it has side
729 expand_builtin_prefetch (arglist)
732 tree arg0, arg1, arg2;
735 if (!validate_arglist (arglist, POINTER_TYPE, 0))
738 arg0 = TREE_VALUE (arglist);
739 /* Arguments 1 and 2 are optional; argument 1 (read/write) defaults to
740 zero (read) and argument 2 (locality) defaults to 3 (high degree of
742 if (TREE_CHAIN (arglist))
744 arg1 = TREE_VALUE (TREE_CHAIN (arglist));
745 if (TREE_CHAIN (TREE_CHAIN (arglist)))
746 arg2 = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
748 arg2 = build_int_2 (3, 0);
752 arg1 = integer_zero_node;
753 arg2 = build_int_2 (3, 0);
756 /* Argument 0 is an address. */
757 op0 = expand_expr (arg0, NULL_RTX, Pmode, EXPAND_NORMAL);
759 /* Argument 1 (read/write flag) must be a compile-time constant int. */
760 if (TREE_CODE (arg1) != INTEGER_CST)
762 error ("second arg to `__builtin_prefetch' must be a constant");
763 arg1 = integer_zero_node;
765 op1 = expand_expr (arg1, NULL_RTX, VOIDmode, 0);
766 /* Argument 1 must be either zero or one. */
767 if (INTVAL (op1) != 0 && INTVAL (op1) != 1)
769 warning ("invalid second arg to __builtin_prefetch; using zero");
773 /* Argument 2 (locality) must be a compile-time constant int. */
774 if (TREE_CODE (arg2) != INTEGER_CST)
776 error ("third arg to `__builtin_prefetch' must be a constant");
777 arg2 = integer_zero_node;
779 op2 = expand_expr (arg2, NULL_RTX, VOIDmode, 0);
780 /* Argument 2 must be 0, 1, 2, or 3. */
781 if (INTVAL (op2) < 0 || INTVAL (op2) > 3)
783 warning ("invalid third arg to __builtin_prefetch; using zero");
790 if (! (*insn_data[(int)CODE_FOR_prefetch].operand[0].predicate)
792 insn_data[(int)CODE_FOR_prefetch].operand[0].mode))
793 op0 = force_reg (Pmode, op0);
794 emit_insn (gen_prefetch (op0, op1, op2));
798 op0 = protect_from_queue (op0, 0);
799 /* Don't do anything with direct references to volatile memory, but
800 generate code to handle other side effects. */
801 if (GET_CODE (op0) != MEM && side_effects_p (op0))
805 /* Get a MEM rtx for expression EXP which is the address of an operand
806 to be used to be used in a string instruction (cmpstrsi, movstrsi, ..). */
812 rtx addr = expand_expr (exp, NULL_RTX, ptr_mode, EXPAND_SUM);
815 #ifdef POINTERS_EXTEND_UNSIGNED
816 if (GET_MODE (addr) != Pmode)
817 addr = convert_memory_address (Pmode, addr);
820 mem = gen_rtx_MEM (BLKmode, memory_address (BLKmode, addr));
822 /* Get an expression we can use to find the attributes to assign to MEM.
823 If it is an ADDR_EXPR, use the operand. Otherwise, dereference it if
824 we can. First remove any nops. */
825 while ((TREE_CODE (exp) == NOP_EXPR || TREE_CODE (exp) == CONVERT_EXPR
826 || TREE_CODE (exp) == NON_LVALUE_EXPR)
827 && POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (exp, 0))))
828 exp = TREE_OPERAND (exp, 0);
830 if (TREE_CODE (exp) == ADDR_EXPR)
832 exp = TREE_OPERAND (exp, 0);
833 set_mem_attributes (mem, exp, 0);
835 else if (POINTER_TYPE_P (TREE_TYPE (exp)))
837 exp = build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (exp)), exp);
838 /* memcpy, memset and other builtin stringops can alias with anything. */
839 set_mem_alias_set (mem, 0);
845 /* Built-in functions to perform an untyped call and return. */
847 /* For each register that may be used for calling a function, this
848 gives a mode used to copy the register's value. VOIDmode indicates
849 the register is not used for calling a function. If the machine
850 has register windows, this gives only the outbound registers.
851 INCOMING_REGNO gives the corresponding inbound register. */
852 static enum machine_mode apply_args_mode[FIRST_PSEUDO_REGISTER];
854 /* For each register that may be used for returning values, this gives
855 a mode used to copy the register's value. VOIDmode indicates the
856 register is not used for returning values. If the machine has
857 register windows, this gives only the outbound registers.
858 INCOMING_REGNO gives the corresponding inbound register. */
859 static enum machine_mode apply_result_mode[FIRST_PSEUDO_REGISTER];
861 /* For each register that may be used for calling a function, this
862 gives the offset of that register into the block returned by
863 __builtin_apply_args. 0 indicates that the register is not
864 used for calling a function. */
865 static int apply_args_reg_offset[FIRST_PSEUDO_REGISTER];
867 /* Return the offset of register REGNO into the block returned by
868 __builtin_apply_args. This is not declared static, since it is
869 needed in objc-act.c. */
872 apply_args_register_offset (regno)
877 /* Arguments are always put in outgoing registers (in the argument
878 block) if such make sense. */
879 #ifdef OUTGOING_REGNO
880 regno = OUTGOING_REGNO(regno);
882 return apply_args_reg_offset[regno];
885 /* Return the size required for the block returned by __builtin_apply_args,
886 and initialize apply_args_mode. */
891 static int size = -1;
894 enum machine_mode mode;
896 /* The values computed by this function never change. */
899 /* The first value is the incoming arg-pointer. */
900 size = GET_MODE_SIZE (Pmode);
902 /* The second value is the structure value address unless this is
903 passed as an "invisible" first argument. */
904 if (struct_value_rtx)
905 size += GET_MODE_SIZE (Pmode);
907 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
908 if (FUNCTION_ARG_REGNO_P (regno))
910 /* Search for the proper mode for copying this register's
911 value. I'm not sure this is right, but it works so far. */
912 enum machine_mode best_mode = VOIDmode;
914 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
916 mode = GET_MODE_WIDER_MODE (mode))
917 if (HARD_REGNO_MODE_OK (regno, mode)
918 && HARD_REGNO_NREGS (regno, mode) == 1)
921 if (best_mode == VOIDmode)
922 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
924 mode = GET_MODE_WIDER_MODE (mode))
925 if (HARD_REGNO_MODE_OK (regno, mode)
926 && have_insn_for (SET, mode))
929 if (best_mode == VOIDmode)
930 for (mode = GET_CLASS_NARROWEST_MODE (MODE_VECTOR_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_INT);
940 mode = GET_MODE_WIDER_MODE (mode))
941 if (HARD_REGNO_MODE_OK (regno, mode)
942 && have_insn_for (SET, mode))
946 if (mode == VOIDmode)
949 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
950 if (size % align != 0)
951 size = CEIL (size, align) * align;
952 apply_args_reg_offset[regno] = size;
953 size += GET_MODE_SIZE (mode);
954 apply_args_mode[regno] = mode;
958 apply_args_mode[regno] = VOIDmode;
959 apply_args_reg_offset[regno] = 0;
965 /* Return the size required for the block returned by __builtin_apply,
966 and initialize apply_result_mode. */
971 static int size = -1;
973 enum machine_mode mode;
975 /* The values computed by this function never change. */
980 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
981 if (FUNCTION_VALUE_REGNO_P (regno))
983 /* Search for the proper mode for copying this register's
984 value. I'm not sure this is right, but it works so far. */
985 enum machine_mode best_mode = VOIDmode;
987 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
989 mode = GET_MODE_WIDER_MODE (mode))
990 if (HARD_REGNO_MODE_OK (regno, mode))
993 if (best_mode == VOIDmode)
994 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
996 mode = GET_MODE_WIDER_MODE (mode))
997 if (HARD_REGNO_MODE_OK (regno, mode)
998 && have_insn_for (SET, mode))
1001 if (best_mode == VOIDmode)
1002 for (mode = GET_CLASS_NARROWEST_MODE (MODE_VECTOR_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_INT);
1012 mode = GET_MODE_WIDER_MODE (mode))
1013 if (HARD_REGNO_MODE_OK (regno, mode)
1014 && have_insn_for (SET, mode))
1018 if (mode == VOIDmode)
1021 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
1022 if (size % align != 0)
1023 size = CEIL (size, align) * align;
1024 size += GET_MODE_SIZE (mode);
1025 apply_result_mode[regno] = mode;
1028 apply_result_mode[regno] = VOIDmode;
1030 /* Allow targets that use untyped_call and untyped_return to override
1031 the size so that machine-specific information can be stored here. */
1032 #ifdef APPLY_RESULT_SIZE
1033 size = APPLY_RESULT_SIZE;
1039 #if defined (HAVE_untyped_call) || defined (HAVE_untyped_return)
1040 /* Create a vector describing the result block RESULT. If SAVEP is true,
1041 the result block is used to save the values; otherwise it is used to
1042 restore the values. */
1045 result_vector (savep, result)
1049 int regno, size, align, nelts;
1050 enum machine_mode mode;
1052 rtx *savevec = (rtx *) alloca (FIRST_PSEUDO_REGISTER * sizeof (rtx));
1055 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1056 if ((mode = apply_result_mode[regno]) != VOIDmode)
1058 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
1059 if (size % align != 0)
1060 size = CEIL (size, align) * align;
1061 reg = gen_rtx_REG (mode, savep ? regno : INCOMING_REGNO (regno));
1062 mem = adjust_address (result, mode, size);
1063 savevec[nelts++] = (savep
1064 ? gen_rtx_SET (VOIDmode, mem, reg)
1065 : gen_rtx_SET (VOIDmode, reg, mem));
1066 size += GET_MODE_SIZE (mode);
1068 return gen_rtx_PARALLEL (VOIDmode, gen_rtvec_v (nelts, savevec));
1070 #endif /* HAVE_untyped_call or HAVE_untyped_return */
1072 /* Save the state required to perform an untyped call with the same
1073 arguments as were passed to the current function. */
1076 expand_builtin_apply_args_1 ()
1079 int size, align, regno;
1080 enum machine_mode mode;
1082 /* Create a block where the arg-pointer, structure value address,
1083 and argument registers can be saved. */
1084 registers = assign_stack_local (BLKmode, apply_args_size (), -1);
1086 /* Walk past the arg-pointer and structure value address. */
1087 size = GET_MODE_SIZE (Pmode);
1088 if (struct_value_rtx)
1089 size += GET_MODE_SIZE (Pmode);
1091 /* Save each register used in calling a function to the block. */
1092 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1093 if ((mode = apply_args_mode[regno]) != VOIDmode)
1097 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
1098 if (size % align != 0)
1099 size = CEIL (size, align) * align;
1101 tem = gen_rtx_REG (mode, INCOMING_REGNO (regno));
1103 emit_move_insn (adjust_address (registers, mode, size), tem);
1104 size += GET_MODE_SIZE (mode);
1107 /* Save the arg pointer to the block. */
1108 emit_move_insn (adjust_address (registers, Pmode, 0),
1109 copy_to_reg (virtual_incoming_args_rtx));
1110 size = GET_MODE_SIZE (Pmode);
1112 /* Save the structure value address unless this is passed as an
1113 "invisible" first argument. */
1114 if (struct_value_incoming_rtx)
1116 emit_move_insn (adjust_address (registers, Pmode, size),
1117 copy_to_reg (struct_value_incoming_rtx));
1118 size += GET_MODE_SIZE (Pmode);
1121 /* Return the address of the block. */
1122 return copy_addr_to_reg (XEXP (registers, 0));
1125 /* __builtin_apply_args returns block of memory allocated on
1126 the stack into which is stored the arg pointer, structure
1127 value address, static chain, and all the registers that might
1128 possibly be used in performing a function call. The code is
1129 moved to the start of the function so the incoming values are
1133 expand_builtin_apply_args ()
1135 /* Don't do __builtin_apply_args more than once in a function.
1136 Save the result of the first call and reuse it. */
1137 if (apply_args_value != 0)
1138 return apply_args_value;
1140 /* When this function is called, it means that registers must be
1141 saved on entry to this function. So we migrate the
1142 call to the first insn of this function. */
1147 temp = expand_builtin_apply_args_1 ();
1151 apply_args_value = temp;
1153 /* Put the sequence after the NOTE that starts the function.
1154 If this is inside a SEQUENCE, make the outer-level insn
1155 chain current, so the code is placed at the start of the
1157 push_topmost_sequence ();
1158 emit_insns_before (seq, NEXT_INSN (get_insns ()));
1159 pop_topmost_sequence ();
1164 /* Perform an untyped call and save the state required to perform an
1165 untyped return of whatever value was returned by the given function. */
1168 expand_builtin_apply (function, arguments, argsize)
1169 rtx function, arguments, argsize;
1171 int size, align, regno;
1172 enum machine_mode mode;
1173 rtx incoming_args, result, reg, dest, src, call_insn;
1174 rtx old_stack_level = 0;
1175 rtx call_fusage = 0;
1177 #ifdef POINTERS_EXTEND_UNSIGNED
1178 if (GET_MODE (arguments) != Pmode)
1179 arguments = convert_memory_address (Pmode, arguments);
1182 /* Create a block where the return registers can be saved. */
1183 result = assign_stack_local (BLKmode, apply_result_size (), -1);
1185 /* Fetch the arg pointer from the ARGUMENTS block. */
1186 incoming_args = gen_reg_rtx (Pmode);
1187 emit_move_insn (incoming_args, gen_rtx_MEM (Pmode, arguments));
1188 #ifndef STACK_GROWS_DOWNWARD
1189 incoming_args = expand_simple_binop (Pmode, MINUS, incoming_args, argsize,
1190 incoming_args, 0, OPTAB_LIB_WIDEN);
1193 /* Perform postincrements before actually calling the function. */
1196 /* Push a new argument block and copy the arguments. Do not allow
1197 the (potential) memcpy call below to interfere with our stack
1199 do_pending_stack_adjust ();
1202 /* Save the stack with nonlocal if available */
1203 #ifdef HAVE_save_stack_nonlocal
1204 if (HAVE_save_stack_nonlocal)
1205 emit_stack_save (SAVE_NONLOCAL, &old_stack_level, NULL_RTX);
1208 emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX);
1210 /* Push a block of memory onto the stack to store the memory arguments.
1211 Save the address in a register, and copy the memory arguments. ??? I
1212 haven't figured out how the calling convention macros effect this,
1213 but it's likely that the source and/or destination addresses in
1214 the block copy will need updating in machine specific ways. */
1215 dest = allocate_dynamic_stack_space (argsize, 0, BITS_PER_UNIT);
1216 dest = gen_rtx_MEM (BLKmode, dest);
1217 set_mem_align (dest, PARM_BOUNDARY);
1218 src = gen_rtx_MEM (BLKmode, incoming_args);
1219 set_mem_align (src, PARM_BOUNDARY);
1220 emit_block_move (dest, src, argsize);
1222 /* Refer to the argument block. */
1224 arguments = gen_rtx_MEM (BLKmode, arguments);
1225 set_mem_align (arguments, PARM_BOUNDARY);
1227 /* Walk past the arg-pointer and structure value address. */
1228 size = GET_MODE_SIZE (Pmode);
1229 if (struct_value_rtx)
1230 size += GET_MODE_SIZE (Pmode);
1232 /* Restore each of the registers previously saved. Make USE insns
1233 for each of these registers for use in making the call. */
1234 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1235 if ((mode = apply_args_mode[regno]) != VOIDmode)
1237 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
1238 if (size % align != 0)
1239 size = CEIL (size, align) * align;
1240 reg = gen_rtx_REG (mode, regno);
1241 emit_move_insn (reg, adjust_address (arguments, mode, size));
1242 use_reg (&call_fusage, reg);
1243 size += GET_MODE_SIZE (mode);
1246 /* Restore the structure value address unless this is passed as an
1247 "invisible" first argument. */
1248 size = GET_MODE_SIZE (Pmode);
1249 if (struct_value_rtx)
1251 rtx value = gen_reg_rtx (Pmode);
1252 emit_move_insn (value, adjust_address (arguments, Pmode, size));
1253 emit_move_insn (struct_value_rtx, value);
1254 if (GET_CODE (struct_value_rtx) == REG)
1255 use_reg (&call_fusage, struct_value_rtx);
1256 size += GET_MODE_SIZE (Pmode);
1259 /* All arguments and registers used for the call are set up by now! */
1260 function = prepare_call_address (function, NULL_TREE, &call_fusage, 0, 0);
1262 /* Ensure address is valid. SYMBOL_REF is already valid, so no need,
1263 and we don't want to load it into a register as an optimization,
1264 because prepare_call_address already did it if it should be done. */
1265 if (GET_CODE (function) != SYMBOL_REF)
1266 function = memory_address (FUNCTION_MODE, function);
1268 /* Generate the actual call instruction and save the return value. */
1269 #ifdef HAVE_untyped_call
1270 if (HAVE_untyped_call)
1271 emit_call_insn (gen_untyped_call (gen_rtx_MEM (FUNCTION_MODE, function),
1272 result, result_vector (1, result)));
1275 #ifdef HAVE_call_value
1276 if (HAVE_call_value)
1280 /* Locate the unique return register. It is not possible to
1281 express a call that sets more than one return register using
1282 call_value; use untyped_call for that. In fact, untyped_call
1283 only needs to save the return registers in the given block. */
1284 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1285 if ((mode = apply_result_mode[regno]) != VOIDmode)
1288 abort (); /* HAVE_untyped_call required. */
1289 valreg = gen_rtx_REG (mode, regno);
1292 emit_call_insn (GEN_CALL_VALUE (valreg,
1293 gen_rtx_MEM (FUNCTION_MODE, function),
1294 const0_rtx, NULL_RTX, const0_rtx));
1296 emit_move_insn (adjust_address (result, GET_MODE (valreg), 0), valreg);
1302 /* Find the CALL insn we just emitted. */
1303 for (call_insn = get_last_insn ();
1304 call_insn && GET_CODE (call_insn) != CALL_INSN;
1305 call_insn = PREV_INSN (call_insn))
1311 /* Put the register usage information on the CALL. If there is already
1312 some usage information, put ours at the end. */
1313 if (CALL_INSN_FUNCTION_USAGE (call_insn))
1317 for (link = CALL_INSN_FUNCTION_USAGE (call_insn); XEXP (link, 1) != 0;
1318 link = XEXP (link, 1))
1321 XEXP (link, 1) = call_fusage;
1324 CALL_INSN_FUNCTION_USAGE (call_insn) = call_fusage;
1326 /* Restore the stack. */
1327 #ifdef HAVE_save_stack_nonlocal
1328 if (HAVE_save_stack_nonlocal)
1329 emit_stack_restore (SAVE_NONLOCAL, old_stack_level, NULL_RTX);
1332 emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX);
1336 /* Return the address of the result block. */
1337 return copy_addr_to_reg (XEXP (result, 0));
1340 /* Perform an untyped return. */
1343 expand_builtin_return (result)
1346 int size, align, regno;
1347 enum machine_mode mode;
1349 rtx call_fusage = 0;
1351 #ifdef POINTERS_EXTEND_UNSIGNED
1352 if (GET_MODE (result) != Pmode)
1353 result = convert_memory_address (Pmode, result);
1356 apply_result_size ();
1357 result = gen_rtx_MEM (BLKmode, result);
1359 #ifdef HAVE_untyped_return
1360 if (HAVE_untyped_return)
1362 emit_jump_insn (gen_untyped_return (result, result_vector (0, result)));
1368 /* Restore the return value and note that each value is used. */
1370 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1371 if ((mode = apply_result_mode[regno]) != VOIDmode)
1373 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
1374 if (size % align != 0)
1375 size = CEIL (size, align) * align;
1376 reg = gen_rtx_REG (mode, INCOMING_REGNO (regno));
1377 emit_move_insn (reg, adjust_address (result, mode, size));
1379 push_to_sequence (call_fusage);
1380 emit_insn (gen_rtx_USE (VOIDmode, reg));
1381 call_fusage = get_insns ();
1383 size += GET_MODE_SIZE (mode);
1386 /* Put the USE insns before the return. */
1387 emit_insns (call_fusage);
1389 /* Return whatever values was restored by jumping directly to the end
1391 expand_null_return ();
1394 /* Used by expand_builtin_classify_type and fold_builtin_classify_type. */
1396 static enum type_class
1397 type_to_class (type)
1400 switch (TREE_CODE (type))
1402 case VOID_TYPE: return void_type_class;
1403 case INTEGER_TYPE: return integer_type_class;
1404 case CHAR_TYPE: return char_type_class;
1405 case ENUMERAL_TYPE: return enumeral_type_class;
1406 case BOOLEAN_TYPE: return boolean_type_class;
1407 case POINTER_TYPE: return pointer_type_class;
1408 case REFERENCE_TYPE: return reference_type_class;
1409 case OFFSET_TYPE: return offset_type_class;
1410 case REAL_TYPE: return real_type_class;
1411 case COMPLEX_TYPE: return complex_type_class;
1412 case FUNCTION_TYPE: return function_type_class;
1413 case METHOD_TYPE: return method_type_class;
1414 case RECORD_TYPE: return record_type_class;
1416 case QUAL_UNION_TYPE: return union_type_class;
1417 case ARRAY_TYPE: return (TYPE_STRING_FLAG (type)
1418 ? string_type_class : array_type_class);
1419 case SET_TYPE: return set_type_class;
1420 case FILE_TYPE: return file_type_class;
1421 case LANG_TYPE: return lang_type_class;
1422 default: return no_type_class;
1426 /* Expand a call to __builtin_classify_type with arguments found in
1430 expand_builtin_classify_type (arglist)
1434 return GEN_INT (type_to_class (TREE_TYPE (TREE_VALUE (arglist))));
1435 return GEN_INT (no_type_class);
1438 /* Expand expression EXP, which is a call to __builtin_constant_p. */
1441 expand_builtin_constant_p (exp)
1444 tree arglist = TREE_OPERAND (exp, 1);
1445 enum machine_mode value_mode = TYPE_MODE (TREE_TYPE (exp));
1450 arglist = TREE_VALUE (arglist);
1452 /* We have taken care of the easy cases during constant folding. This
1453 case is not obvious, so emit (constant_p_rtx (ARGLIST)) and let CSE get a
1454 chance to see if it can deduce whether ARGLIST is constant. */
1456 tmp = expand_expr (arglist, NULL_RTX, VOIDmode, 0);
1457 tmp = gen_rtx_CONSTANT_P_RTX (value_mode, tmp);
1461 /* Expand a call to one of the builtin math functions (sin, cos, or sqrt).
1462 Return 0 if a normal call should be emitted rather than expanding the
1463 function in-line. EXP is the expression that is a call to the builtin
1464 function; if convenient, the result should be placed in TARGET.
1465 SUBTARGET may be used as the target for computing one of EXP's operands. */
1468 expand_builtin_mathfn (exp, target, subtarget)
1470 rtx target, subtarget;
1472 optab builtin_optab;
1474 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
1475 tree arglist = TREE_OPERAND (exp, 1);
1476 enum machine_mode argmode;
1478 if (!validate_arglist (arglist, REAL_TYPE, VOID_TYPE))
1481 /* Stabilize and compute the argument. */
1482 if (TREE_CODE (TREE_VALUE (arglist)) != VAR_DECL
1483 && TREE_CODE (TREE_VALUE (arglist)) != PARM_DECL)
1485 exp = copy_node (exp);
1486 TREE_OPERAND (exp, 1) = arglist;
1487 /* Wrap the computation of the argument in a SAVE_EXPR. That
1488 way, if we need to expand the argument again (as in the
1489 flag_errno_math case below where we cannot directly set
1490 errno), we will not perform side-effects more than once.
1491 Note that here we're mutating the original EXP as well as the
1492 copy; that's the right thing to do in case the original EXP
1493 is expanded later. */
1494 TREE_VALUE (arglist) = save_expr (TREE_VALUE (arglist));
1495 arglist = copy_node (arglist);
1497 op0 = expand_expr (TREE_VALUE (arglist), subtarget, VOIDmode, 0);
1499 /* Make a suitable register to place result in. */
1500 target = gen_reg_rtx (TYPE_MODE (TREE_TYPE (exp)));
1505 switch (DECL_FUNCTION_CODE (fndecl))
1510 builtin_optab = sin_optab; break;
1514 builtin_optab = cos_optab; break;
1516 case BUILT_IN_SQRTF:
1517 case BUILT_IN_SQRTL:
1518 builtin_optab = sqrt_optab; break;
1523 /* Compute into TARGET.
1524 Set TARGET to wherever the result comes back. */
1525 argmode = TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist)));
1526 target = expand_unop (argmode, builtin_optab, op0, target, 0);
1528 /* If we were unable to expand via the builtin, stop the
1529 sequence (without outputting the insns) and return 0, causing
1530 a call to the library function. */
1537 /* If errno must be maintained, we must set it to EDOM for NaN results. */
1539 if (flag_errno_math && HONOR_NANS (argmode))
1543 lab1 = gen_label_rtx ();
1545 /* Test the result; if it is NaN, set errno=EDOM because
1546 the argument was not in the domain. */
1547 emit_cmp_and_jump_insns (target, target, EQ, 0, GET_MODE (target),
1552 #ifdef GEN_ERRNO_RTX
1553 rtx errno_rtx = GEN_ERRNO_RTX;
1556 = gen_rtx_MEM (word_mode, gen_rtx_SYMBOL_REF (Pmode, "errno"));
1559 emit_move_insn (errno_rtx, GEN_INT (TARGET_EDOM));
1562 /* We can't set errno=EDOM directly; let the library call do it.
1563 Pop the arguments right away in case the call gets deleted. */
1565 expand_call (exp, target, 0);
1572 /* Output the entire sequence. */
1573 insns = get_insns ();
1580 /* Expand expression EXP which is a call to the strlen builtin. Return 0
1581 if we failed the caller should emit a normal call, otherwise
1582 try to get the result in TARGET, if convenient. */
1585 expand_builtin_strlen (exp, target)
1589 tree arglist = TREE_OPERAND (exp, 1);
1590 enum machine_mode value_mode = TYPE_MODE (TREE_TYPE (exp));
1592 if (!validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
1597 tree src = TREE_VALUE (arglist);
1600 = get_pointer_alignment (src, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
1602 rtx result, src_reg, char_rtx, before_strlen;
1603 enum machine_mode insn_mode = value_mode, char_mode;
1604 enum insn_code icode = CODE_FOR_nothing;
1606 /* If SRC is not a pointer type, don't do this operation inline. */
1610 /* Bail out if we can't compute strlen in the right mode. */
1611 while (insn_mode != VOIDmode)
1613 icode = strlen_optab->handlers[(int) insn_mode].insn_code;
1614 if (icode != CODE_FOR_nothing)
1617 insn_mode = GET_MODE_WIDER_MODE (insn_mode);
1619 if (insn_mode == VOIDmode)
1622 /* Make a place to write the result of the instruction. */
1625 && GET_CODE (result) == REG
1626 && GET_MODE (result) == insn_mode
1627 && REGNO (result) >= FIRST_PSEUDO_REGISTER))
1628 result = gen_reg_rtx (insn_mode);
1630 /* Make a place to hold the source address. We will not expand
1631 the actual source until we are sure that the expansion will
1632 not fail -- there are trees that cannot be expanded twice. */
1633 src_reg = gen_reg_rtx (Pmode);
1635 /* Mark the beginning of the strlen sequence so we can emit the
1636 source operand later. */
1637 before_strlen = get_last_insn();
1639 char_rtx = const0_rtx;
1640 char_mode = insn_data[(int) icode].operand[2].mode;
1641 if (! (*insn_data[(int) icode].operand[2].predicate) (char_rtx,
1643 char_rtx = copy_to_mode_reg (char_mode, char_rtx);
1645 pat = GEN_FCN (icode) (result, gen_rtx_MEM (BLKmode, src_reg),
1646 char_rtx, GEN_INT (align));
1651 /* Now that we are assured of success, expand the source. */
1653 pat = memory_address (BLKmode,
1654 expand_expr (src, src_reg, ptr_mode, EXPAND_SUM));
1656 emit_move_insn (src_reg, pat);
1657 pat = gen_sequence ();
1661 emit_insn_after (pat, before_strlen);
1663 emit_insn_before (pat, get_insns ());
1665 /* Return the value in the proper mode for this function. */
1666 if (GET_MODE (result) == value_mode)
1668 else if (target != 0)
1669 convert_move (target, result, 0);
1671 target = convert_to_mode (value_mode, result, 0);
1677 /* Expand a call to the strstr builtin. Return 0 if we failed the
1678 caller should emit a normal call, otherwise try to get the result
1679 in TARGET, if convenient (and in mode MODE if that's convenient). */
1682 expand_builtin_strstr (arglist, target, mode)
1685 enum machine_mode mode;
1687 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
1691 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1693 const char *p1, *p2;
1702 const char *r = strstr (p1, p2);
1707 /* Return an offset into the constant string argument. */
1708 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1709 s1, ssize_int (r - p1))),
1710 target, mode, EXPAND_NORMAL);
1714 return expand_expr (s1, target, mode, EXPAND_NORMAL);
1719 fn = built_in_decls[BUILT_IN_STRCHR];
1723 /* New argument list transforming strstr(s1, s2) to
1724 strchr(s1, s2[0]). */
1726 build_tree_list (NULL_TREE, build_int_2 (p2[0], 0));
1727 arglist = tree_cons (NULL_TREE, s1, arglist);
1728 return expand_expr (build_function_call_expr (fn, arglist),
1729 target, mode, EXPAND_NORMAL);
1733 /* Expand a call to the strchr builtin. Return 0 if we failed the
1734 caller should emit a normal call, otherwise try to get the result
1735 in TARGET, if convenient (and in mode MODE if that's convenient). */
1738 expand_builtin_strchr (arglist, target, mode)
1741 enum machine_mode mode;
1743 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
1747 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1750 if (TREE_CODE (s2) != INTEGER_CST)
1759 if (target_char_cast (s2, &c))
1767 /* Return an offset into the constant string argument. */
1768 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1769 s1, ssize_int (r - p1))),
1770 target, mode, EXPAND_NORMAL);
1773 /* FIXME: Should use here strchrM optab so that ports can optimize
1779 /* Expand a call to the strrchr builtin. Return 0 if we failed the
1780 caller should emit a normal call, otherwise try to get the result
1781 in TARGET, if convenient (and in mode MODE if that's convenient). */
1784 expand_builtin_strrchr (arglist, target, mode)
1787 enum machine_mode mode;
1789 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
1793 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1797 if (TREE_CODE (s2) != INTEGER_CST)
1806 if (target_char_cast (s2, &c))
1809 r = strrchr (p1, c);
1814 /* Return an offset into the constant string argument. */
1815 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1816 s1, ssize_int (r - p1))),
1817 target, mode, EXPAND_NORMAL);
1820 if (! integer_zerop (s2))
1823 fn = built_in_decls[BUILT_IN_STRCHR];
1827 /* Transform strrchr(s1, '\0') to strchr(s1, '\0'). */
1828 return expand_expr (build_function_call_expr (fn, arglist),
1829 target, mode, EXPAND_NORMAL);
1833 /* Expand a call to the strpbrk builtin. Return 0 if we failed the
1834 caller should emit a normal call, otherwise try to get the result
1835 in TARGET, if convenient (and in mode MODE if that's convenient). */
1838 expand_builtin_strpbrk (arglist, target, mode)
1841 enum machine_mode mode;
1843 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
1847 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1849 const char *p1, *p2;
1858 const char *r = strpbrk (p1, p2);
1863 /* Return an offset into the constant string argument. */
1864 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1865 s1, ssize_int (r - p1))),
1866 target, mode, EXPAND_NORMAL);
1871 /* strpbrk(x, "") == NULL.
1872 Evaluate and ignore the arguments in case they had
1874 expand_expr (s1, const0_rtx, VOIDmode, EXPAND_NORMAL);
1879 return 0; /* Really call strpbrk. */
1881 fn = built_in_decls[BUILT_IN_STRCHR];
1885 /* New argument list transforming strpbrk(s1, s2) to
1886 strchr(s1, s2[0]). */
1888 build_tree_list (NULL_TREE, build_int_2 (p2[0], 0));
1889 arglist = tree_cons (NULL_TREE, s1, arglist);
1890 return expand_expr (build_function_call_expr (fn, arglist),
1891 target, mode, EXPAND_NORMAL);
1895 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
1896 bytes from constant string DATA + OFFSET and return it as target
1900 builtin_memcpy_read_str (data, offset, mode)
1902 HOST_WIDE_INT offset;
1903 enum machine_mode mode;
1905 const char *str = (const char *) data;
1908 || ((unsigned HOST_WIDE_INT) offset + GET_MODE_SIZE (mode)
1909 > strlen (str) + 1))
1910 abort (); /* Attempt to read past the end of constant string. */
1912 return c_readstr (str + offset, mode);
1915 /* Expand a call to the memcpy builtin, with arguments in ARGLIST.
1916 Return 0 if we failed, the caller should emit a normal call, otherwise
1917 try to get the result in TARGET, if convenient (and in mode MODE if
1918 that's convenient). */
1921 expand_builtin_memcpy (arglist, target, mode)
1924 enum machine_mode mode;
1926 if (!validate_arglist (arglist,
1927 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
1931 tree dest = TREE_VALUE (arglist);
1932 tree src = TREE_VALUE (TREE_CHAIN (arglist));
1933 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
1934 const char *src_str;
1936 unsigned int src_align = get_pointer_alignment (src, BIGGEST_ALIGNMENT);
1937 unsigned int dest_align
1938 = get_pointer_alignment (dest, BIGGEST_ALIGNMENT);
1939 rtx dest_mem, src_mem, dest_addr, len_rtx;
1941 /* If DEST is not a pointer type, call the normal function. */
1942 if (dest_align == 0)
1945 /* If the LEN parameter is zero, return DEST. */
1946 if (host_integerp (len, 1) && tree_low_cst (len, 1) == 0)
1948 /* Evaluate and ignore SRC in case it has side-effects. */
1949 expand_expr (src, const0_rtx, VOIDmode, EXPAND_NORMAL);
1950 return expand_expr (dest, target, mode, EXPAND_NORMAL);
1953 /* If either SRC is not a pointer type, don't do this
1954 operation in-line. */
1958 dest_mem = get_memory_rtx (dest);
1959 set_mem_align (dest_mem, dest_align);
1960 len_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
1961 src_str = c_getstr (src);
1963 /* If SRC is a string constant and block move would be done
1964 by pieces, we can avoid loading the string from memory
1965 and only stored the computed constants. */
1967 && GET_CODE (len_rtx) == CONST_INT
1968 && (unsigned HOST_WIDE_INT) INTVAL (len_rtx) <= strlen (src_str) + 1
1969 && can_store_by_pieces (INTVAL (len_rtx), builtin_memcpy_read_str,
1970 (PTR) src_str, dest_align))
1972 store_by_pieces (dest_mem, INTVAL (len_rtx),
1973 builtin_memcpy_read_str,
1974 (PTR) src_str, dest_align);
1975 return force_operand (XEXP (dest_mem, 0), NULL_RTX);
1978 src_mem = get_memory_rtx (src);
1979 set_mem_align (src_mem, src_align);
1981 /* Copy word part most expediently. */
1982 dest_addr = emit_block_move (dest_mem, src_mem, len_rtx);
1985 dest_addr = force_operand (XEXP (dest_mem, 0), NULL_RTX);
1991 /* Expand expression EXP, which is a call to the strcpy builtin. Return 0
1992 if we failed the caller should emit a normal call, otherwise try to get
1993 the result in TARGET, if convenient (and in mode MODE if that's
1997 expand_builtin_strcpy (exp, target, mode)
2000 enum machine_mode mode;
2002 tree arglist = TREE_OPERAND (exp, 1);
2005 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2008 fn = built_in_decls[BUILT_IN_MEMCPY];
2012 len = c_strlen (TREE_VALUE (TREE_CHAIN (arglist)));
2016 len = size_binop (PLUS_EXPR, len, ssize_int (1));
2017 chainon (arglist, build_tree_list (NULL_TREE, len));
2018 return expand_expr (build_function_call_expr (fn, arglist),
2019 target, mode, EXPAND_NORMAL);
2022 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
2023 bytes from constant string DATA + OFFSET and return it as target
2027 builtin_strncpy_read_str (data, offset, mode)
2029 HOST_WIDE_INT offset;
2030 enum machine_mode mode;
2032 const char *str = (const char *) data;
2034 if ((unsigned HOST_WIDE_INT) offset > strlen (str))
2037 return c_readstr (str + offset, mode);
2040 /* Expand expression EXP, which is a call to the strncpy builtin. Return 0
2041 if we failed the caller should emit a normal call. */
2044 expand_builtin_strncpy (arglist, target, mode)
2047 enum machine_mode mode;
2049 if (!validate_arglist (arglist,
2050 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2054 tree slen = c_strlen (TREE_VALUE (TREE_CHAIN (arglist)));
2055 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2058 /* We must be passed a constant len parameter. */
2059 if (TREE_CODE (len) != INTEGER_CST)
2062 /* If the len parameter is zero, return the dst parameter. */
2063 if (integer_zerop (len))
2065 /* Evaluate and ignore the src argument in case it has
2067 expand_expr (TREE_VALUE (TREE_CHAIN (arglist)), const0_rtx,
2068 VOIDmode, EXPAND_NORMAL);
2069 /* Return the dst parameter. */
2070 return expand_expr (TREE_VALUE (arglist), target, mode,
2074 /* Now, we must be passed a constant src ptr parameter. */
2075 if (slen == 0 || TREE_CODE (slen) != INTEGER_CST)
2078 slen = size_binop (PLUS_EXPR, slen, ssize_int (1));
2080 /* We're required to pad with trailing zeros if the requested
2081 len is greater than strlen(s2)+1. In that case try to
2082 use store_by_pieces, if it fails, punt. */
2083 if (tree_int_cst_lt (slen, len))
2085 tree dest = TREE_VALUE (arglist);
2086 unsigned int dest_align
2087 = get_pointer_alignment (dest, BIGGEST_ALIGNMENT);
2088 const char *p = c_getstr (TREE_VALUE (TREE_CHAIN (arglist)));
2091 if (!p || dest_align == 0 || !host_integerp (len, 1)
2092 || !can_store_by_pieces (tree_low_cst (len, 1),
2093 builtin_strncpy_read_str,
2094 (PTR) p, dest_align))
2097 dest_mem = get_memory_rtx (dest);
2098 store_by_pieces (dest_mem, tree_low_cst (len, 1),
2099 builtin_strncpy_read_str,
2100 (PTR) p, dest_align);
2101 return force_operand (XEXP (dest_mem, 0), NULL_RTX);
2104 /* OK transform into builtin memcpy. */
2105 fn = built_in_decls[BUILT_IN_MEMCPY];
2108 return expand_expr (build_function_call_expr (fn, arglist),
2109 target, mode, EXPAND_NORMAL);
2113 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
2114 bytes from constant string DATA + OFFSET and return it as target
2118 builtin_memset_read_str (data, offset, mode)
2120 HOST_WIDE_INT offset ATTRIBUTE_UNUSED;
2121 enum machine_mode mode;
2123 const char *c = (const char *) data;
2124 char *p = alloca (GET_MODE_SIZE (mode));
2126 memset (p, *c, GET_MODE_SIZE (mode));
2128 return c_readstr (p, mode);
2131 /* Expand expression EXP, which is a call to the memset builtin. Return 0
2132 if we failed the caller should emit a normal call, otherwise try to get
2133 the result in TARGET, if convenient (and in mode MODE if that's
2137 expand_builtin_memset (exp, target, mode)
2140 enum machine_mode mode;
2142 tree arglist = TREE_OPERAND (exp, 1);
2144 if (!validate_arglist (arglist,
2145 POINTER_TYPE, INTEGER_TYPE, INTEGER_TYPE, VOID_TYPE))
2149 tree dest = TREE_VALUE (arglist);
2150 tree val = TREE_VALUE (TREE_CHAIN (arglist));
2151 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2154 unsigned int dest_align
2155 = get_pointer_alignment (dest, BIGGEST_ALIGNMENT);
2156 rtx dest_mem, dest_addr, len_rtx;
2158 /* If DEST is not a pointer type, don't do this
2159 operation in-line. */
2160 if (dest_align == 0)
2163 /* If the LEN parameter is zero, return DEST. */
2164 if (host_integerp (len, 1) && tree_low_cst (len, 1) == 0)
2166 /* Evaluate and ignore VAL in case it has side-effects. */
2167 expand_expr (val, const0_rtx, VOIDmode, EXPAND_NORMAL);
2168 return expand_expr (dest, target, mode, EXPAND_NORMAL);
2171 if (TREE_CODE (val) != INTEGER_CST)
2174 if (target_char_cast (val, &c))
2179 if (!host_integerp (len, 1))
2181 if (!can_store_by_pieces (tree_low_cst (len, 1),
2182 builtin_memset_read_str, (PTR) &c,
2186 dest_mem = get_memory_rtx (dest);
2187 store_by_pieces (dest_mem, tree_low_cst (len, 1),
2188 builtin_memset_read_str,
2189 (PTR) &c, dest_align);
2190 return force_operand (XEXP (dest_mem, 0), NULL_RTX);
2193 len_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
2195 dest_mem = get_memory_rtx (dest);
2196 set_mem_align (dest_mem, dest_align);
2197 dest_addr = clear_storage (dest_mem, len_rtx);
2200 dest_addr = force_operand (XEXP (dest_mem, 0), NULL_RTX);
2206 /* Expand expression EXP, which is a call to the bzero builtin. Return 0
2207 if we failed the caller should emit a normal call. */
2210 expand_builtin_bzero (exp)
2213 tree arglist = TREE_OPERAND (exp, 1);
2214 tree dest, size, newarglist;
2217 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2220 dest = TREE_VALUE (arglist);
2221 size = TREE_VALUE (TREE_CHAIN (arglist));
2223 /* New argument list transforming bzero(ptr x, int y) to
2224 memset(ptr x, int 0, size_t y). This is done this way
2225 so that if it isn't expanded inline, we fallback to
2226 calling bzero instead of memset. */
2228 newarglist = build_tree_list (NULL_TREE, convert (sizetype, size));
2229 newarglist = tree_cons (NULL_TREE, integer_zero_node, newarglist);
2230 newarglist = tree_cons (NULL_TREE, dest, newarglist);
2232 TREE_OPERAND (exp, 1) = newarglist;
2233 result = expand_builtin_memset (exp, const0_rtx, VOIDmode);
2235 /* Always restore the original arguments. */
2236 TREE_OPERAND (exp, 1) = arglist;
2241 /* Expand expression EXP, which is a call to the memcmp or the strcmp builtin.
2242 ARGLIST is the argument list for this call. Return 0 if we failed and the
2243 caller should emit a normal call, otherwise try to get the result in
2244 TARGET, if convenient (and in mode MODE, if that's convenient). */
2247 expand_builtin_memcmp (exp, arglist, target, mode)
2248 tree exp ATTRIBUTE_UNUSED;
2251 enum machine_mode mode;
2253 tree arg1, arg2, len;
2254 const char *p1, *p2;
2256 if (!validate_arglist (arglist,
2257 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2260 arg1 = TREE_VALUE (arglist);
2261 arg2 = TREE_VALUE (TREE_CHAIN (arglist));
2262 len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2264 /* If the len parameter is zero, return zero. */
2265 if (host_integerp (len, 1) && tree_low_cst (len, 1) == 0)
2267 /* Evaluate and ignore arg1 and arg2 in case they have
2269 expand_expr (arg1, const0_rtx, VOIDmode, EXPAND_NORMAL);
2270 expand_expr (arg2, const0_rtx, VOIDmode, EXPAND_NORMAL);
2274 p1 = c_getstr (arg1);
2275 p2 = c_getstr (arg2);
2277 /* If all arguments are constant, and the value of len is not greater
2278 than the lengths of arg1 and arg2, evaluate at compile-time. */
2279 if (host_integerp (len, 1) && p1 && p2
2280 && compare_tree_int (len, strlen (p1) + 1) <= 0
2281 && compare_tree_int (len, strlen (p2) + 1) <= 0)
2283 const int r = memcmp (p1, p2, tree_low_cst (len, 1));
2285 return (r < 0 ? constm1_rtx : (r > 0 ? const1_rtx : const0_rtx));
2288 /* If len parameter is one, return an expression corresponding to
2289 (*(const unsigned char*)arg1 - (const unsigned char*)arg2). */
2290 if (host_integerp (len, 1) && tree_low_cst (len, 1) == 1)
2292 tree cst_uchar_node = build_type_variant (unsigned_char_type_node, 1, 0);
2293 tree cst_uchar_ptr_node = build_pointer_type (cst_uchar_node);
2295 fold (build1 (CONVERT_EXPR, integer_type_node,
2296 build1 (INDIRECT_REF, cst_uchar_node,
2297 build1 (NOP_EXPR, cst_uchar_ptr_node, arg1))));
2299 fold (build1 (CONVERT_EXPR, integer_type_node,
2300 build1 (INDIRECT_REF, cst_uchar_node,
2301 build1 (NOP_EXPR, cst_uchar_ptr_node, arg2))));
2302 tree result = fold (build (MINUS_EXPR, integer_type_node, ind1, ind2));
2303 return expand_expr (result, target, mode, EXPAND_NORMAL);
2306 #ifdef HAVE_cmpstrsi
2308 rtx arg1_rtx, arg2_rtx, arg3_rtx;
2313 = get_pointer_alignment (arg1, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
2315 = get_pointer_alignment (arg2, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
2316 enum machine_mode insn_mode
2317 = insn_data[(int) CODE_FOR_cmpstrsi].operand[0].mode;
2319 /* If we don't have POINTER_TYPE, call the function. */
2320 if (arg1_align == 0 || arg2_align == 0)
2323 /* Make a place to write the result of the instruction. */
2326 && GET_CODE (result) == REG && GET_MODE (result) == insn_mode
2327 && REGNO (result) >= FIRST_PSEUDO_REGISTER))
2328 result = gen_reg_rtx (insn_mode);
2330 arg1_rtx = get_memory_rtx (arg1);
2331 arg2_rtx = get_memory_rtx (arg2);
2332 arg3_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
2336 insn = gen_cmpstrsi (result, arg1_rtx, arg2_rtx, arg3_rtx,
2337 GEN_INT (MIN (arg1_align, arg2_align)));
2342 emit_library_call_value (memcmp_libfunc, result, LCT_PURE_MAKE_BLOCK,
2343 TYPE_MODE (integer_type_node), 3,
2344 XEXP (arg1_rtx, 0), Pmode,
2345 XEXP (arg2_rtx, 0), Pmode,
2346 convert_to_mode (TYPE_MODE (sizetype), arg3_rtx,
2347 TREE_UNSIGNED (sizetype)),
2348 TYPE_MODE (sizetype));
2350 /* Return the value in the proper mode for this function. */
2351 mode = TYPE_MODE (TREE_TYPE (exp));
2352 if (GET_MODE (result) == mode)
2354 else if (target != 0)
2356 convert_move (target, result, 0);
2360 return convert_to_mode (mode, result, 0);
2367 /* Expand expression EXP, which is a call to the strcmp builtin. Return 0
2368 if we failed the caller should emit a normal call, otherwise try to get
2369 the result in TARGET, if convenient. */
2372 expand_builtin_strcmp (exp, target, mode)
2375 enum machine_mode mode;
2377 tree arglist = TREE_OPERAND (exp, 1);
2378 tree arg1, arg2, len, len2, fn;
2379 const char *p1, *p2;
2381 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2384 arg1 = TREE_VALUE (arglist);
2385 arg2 = TREE_VALUE (TREE_CHAIN (arglist));
2387 p1 = c_getstr (arg1);
2388 p2 = c_getstr (arg2);
2392 const int i = strcmp (p1, p2);
2393 return (i < 0 ? constm1_rtx : (i > 0 ? const1_rtx : const0_rtx));
2396 /* If either arg is "", return an expression corresponding to
2397 (*(const unsigned char*)arg1 - (const unsigned char*)arg2). */
2398 if ((p1 && *p1 == '\0') || (p2 && *p2 == '\0'))
2400 tree cst_uchar_node = build_type_variant (unsigned_char_type_node, 1, 0);
2401 tree cst_uchar_ptr_node = build_pointer_type (cst_uchar_node);
2403 fold (build1 (CONVERT_EXPR, integer_type_node,
2404 build1 (INDIRECT_REF, cst_uchar_node,
2405 build1 (NOP_EXPR, cst_uchar_ptr_node, arg1))));
2407 fold (build1 (CONVERT_EXPR, integer_type_node,
2408 build1 (INDIRECT_REF, cst_uchar_node,
2409 build1 (NOP_EXPR, cst_uchar_ptr_node, arg2))));
2410 tree result = fold (build (MINUS_EXPR, integer_type_node, ind1, ind2));
2411 return expand_expr (result, target, mode, EXPAND_NORMAL);
2414 len = c_strlen (arg1);
2415 len2 = c_strlen (arg2);
2418 len = size_binop (PLUS_EXPR, ssize_int (1), len);
2421 len2 = size_binop (PLUS_EXPR, ssize_int (1), len2);
2423 /* If we don't have a constant length for the first, use the length
2424 of the second, if we know it. We don't require a constant for
2425 this case; some cost analysis could be done if both are available
2426 but neither is constant. For now, assume they're equally cheap
2427 unless one has side effects.
2429 If both strings have constant lengths, use the smaller. This
2430 could arise if optimization results in strcpy being called with
2431 two fixed strings, or if the code was machine-generated. We should
2432 add some code to the `memcmp' handler below to deal with such
2433 situations, someday. */
2435 if (!len || TREE_CODE (len) != INTEGER_CST)
2437 if (len2 && !TREE_SIDE_EFFECTS (len2))
2442 else if (len2 && TREE_CODE (len2) == INTEGER_CST
2443 && tree_int_cst_lt (len2, len))
2446 /* If both arguments have side effects, we cannot optimize. */
2447 if (TREE_SIDE_EFFECTS (len))
2450 fn = built_in_decls[BUILT_IN_MEMCMP];
2454 chainon (arglist, build_tree_list (NULL_TREE, len));
2455 return expand_expr (build_function_call_expr (fn, arglist),
2456 target, mode, EXPAND_NORMAL);
2459 /* Expand expression EXP, which is a call to the strncmp builtin. Return 0
2460 if we failed the caller should emit a normal call, otherwise try to get
2461 the result in TARGET, if convenient. */
2464 expand_builtin_strncmp (exp, target, mode)
2467 enum machine_mode mode;
2469 tree arglist = TREE_OPERAND (exp, 1);
2470 tree fn, newarglist, len = 0;
2471 tree arg1, arg2, arg3;
2472 const char *p1, *p2;
2474 if (!validate_arglist (arglist,
2475 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2478 arg1 = TREE_VALUE (arglist);
2479 arg2 = TREE_VALUE (TREE_CHAIN (arglist));
2480 arg3 = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2482 /* If the len parameter is zero, return zero. */
2483 if (host_integerp (arg3, 1) && tree_low_cst (arg3, 1) == 0)
2485 /* Evaluate and ignore arg1 and arg2 in case they have
2487 expand_expr (arg1, const0_rtx, VOIDmode, EXPAND_NORMAL);
2488 expand_expr (arg2, const0_rtx, VOIDmode, EXPAND_NORMAL);
2492 p1 = c_getstr (arg1);
2493 p2 = c_getstr (arg2);
2495 /* If all arguments are constant, evaluate at compile-time. */
2496 if (host_integerp (arg3, 1) && p1 && p2)
2498 const int r = strncmp (p1, p2, tree_low_cst (arg3, 1));
2499 return (r < 0 ? constm1_rtx : (r > 0 ? const1_rtx : const0_rtx));
2502 /* If len == 1 or (either string parameter is "" and (len >= 1)),
2503 return (*(const u_char*)arg1 - *(const u_char*)arg2). */
2504 if (host_integerp (arg3, 1)
2505 && (tree_low_cst (arg3, 1) == 1
2506 || (tree_low_cst (arg3, 1) > 1
2507 && ((p1 && *p1 == '\0') || (p2 && *p2 == '\0')))))
2509 tree cst_uchar_node = build_type_variant (unsigned_char_type_node, 1, 0);
2510 tree cst_uchar_ptr_node = build_pointer_type (cst_uchar_node);
2512 fold (build1 (CONVERT_EXPR, integer_type_node,
2513 build1 (INDIRECT_REF, cst_uchar_node,
2514 build1 (NOP_EXPR, cst_uchar_ptr_node, arg1))));
2516 fold (build1 (CONVERT_EXPR, integer_type_node,
2517 build1 (INDIRECT_REF, cst_uchar_node,
2518 build1 (NOP_EXPR, cst_uchar_ptr_node, arg2))));
2519 tree result = fold (build (MINUS_EXPR, integer_type_node, ind1, ind2));
2520 return expand_expr (result, target, mode, EXPAND_NORMAL);
2523 /* If c_strlen can determine an expression for one of the string
2524 lengths, and it doesn't have side effects, then call
2525 expand_builtin_memcmp() using length MIN(strlen(string)+1, arg3). */
2527 /* Perhaps one of the strings is really constant, if so prefer
2528 that constant length over the other string's length. */
2530 len = c_strlen (arg1);
2532 len = c_strlen (arg2);
2534 /* If we still don't have a len, try either string arg as long
2535 as they don't have side effects. */
2536 if (!len && !TREE_SIDE_EFFECTS (arg1))
2537 len = c_strlen (arg1);
2538 if (!len && !TREE_SIDE_EFFECTS (arg2))
2539 len = c_strlen (arg2);
2540 /* If we still don't have a length, punt. */
2544 fn = built_in_decls[BUILT_IN_MEMCMP];
2548 /* Add one to the string length. */
2549 len = fold (size_binop (PLUS_EXPR, len, ssize_int (1)));
2551 /* The actual new length parameter is MIN(len,arg3). */
2552 len = fold (build (MIN_EXPR, TREE_TYPE (len), len, arg3));
2554 newarglist = build_tree_list (NULL_TREE, len);
2555 newarglist = tree_cons (NULL_TREE, arg2, newarglist);
2556 newarglist = tree_cons (NULL_TREE, arg1, newarglist);
2557 return expand_expr (build_function_call_expr (fn, newarglist),
2558 target, mode, EXPAND_NORMAL);
2561 /* Expand expression EXP, which is a call to the strcat builtin.
2562 Return 0 if we failed the caller should emit a normal call,
2563 otherwise try to get the result in TARGET, if convenient. */
2566 expand_builtin_strcat (arglist, target, mode)
2569 enum machine_mode mode;
2571 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2575 tree dst = TREE_VALUE (arglist),
2576 src = TREE_VALUE (TREE_CHAIN (arglist));
2577 const char *p = c_getstr (src);
2579 /* If the string length is zero, return the dst parameter. */
2580 if (p && *p == '\0')
2581 return expand_expr (dst, target, mode, EXPAND_NORMAL);
2587 /* Expand expression EXP, which is a call to the strncat builtin.
2588 Return 0 if we failed the caller should emit a normal call,
2589 otherwise try to get the result in TARGET, if convenient. */
2592 expand_builtin_strncat (arglist, target, mode)
2595 enum machine_mode mode;
2597 if (!validate_arglist (arglist,
2598 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2602 tree dst = TREE_VALUE (arglist),
2603 src = TREE_VALUE (TREE_CHAIN (arglist)),
2604 len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2605 const char *p = c_getstr (src);
2607 /* If the requested length is zero, or the src parameter string
2608 length is zero, return the dst parameter. */
2609 if (integer_zerop (len) || (p && *p == '\0'))
2611 /* Evaluate and ignore the src and len parameters in case
2612 they have side-effects. */
2613 expand_expr (src, const0_rtx, VOIDmode, EXPAND_NORMAL);
2614 expand_expr (len, const0_rtx, VOIDmode, EXPAND_NORMAL);
2615 return expand_expr (dst, target, mode, EXPAND_NORMAL);
2618 /* If the requested len is greater than or equal to the string
2619 length, call strcat. */
2620 if (TREE_CODE (len) == INTEGER_CST && p
2621 && compare_tree_int (len, strlen (p)) >= 0)
2624 = tree_cons (NULL_TREE, dst, build_tree_list (NULL_TREE, src));
2625 tree fn = built_in_decls[BUILT_IN_STRCAT];
2627 /* If the replacement _DECL isn't initialized, don't do the
2632 return expand_expr (build_function_call_expr (fn, newarglist),
2633 target, mode, EXPAND_NORMAL);
2639 /* Expand expression EXP, which is a call to the strspn builtin.
2640 Return 0 if we failed the caller should emit a normal call,
2641 otherwise try to get the result in TARGET, if convenient. */
2644 expand_builtin_strspn (arglist, target, mode)
2647 enum machine_mode mode;
2649 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2653 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
2654 const char *p1 = c_getstr (s1), *p2 = c_getstr (s2);
2656 /* If both arguments are constants, evaluate at compile-time. */
2659 const size_t r = strspn (p1, p2);
2660 return expand_expr (size_int (r), target, mode, EXPAND_NORMAL);
2663 /* If either argument is "", return 0. */
2664 if ((p1 && *p1 == '\0') || (p2 && *p2 == '\0'))
2666 /* Evaluate and ignore both arguments in case either one has
2668 expand_expr (s1, const0_rtx, VOIDmode, EXPAND_NORMAL);
2669 expand_expr (s2, const0_rtx, VOIDmode, EXPAND_NORMAL);
2676 /* Expand expression EXP, which is a call to the strcspn builtin.
2677 Return 0 if we failed the caller should emit a normal call,
2678 otherwise try to get the result in TARGET, if convenient. */
2681 expand_builtin_strcspn (arglist, target, mode)
2684 enum machine_mode mode;
2686 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2690 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
2691 const char *p1 = c_getstr (s1), *p2 = c_getstr (s2);
2693 /* If both arguments are constants, evaluate at compile-time. */
2696 const size_t r = strcspn (p1, p2);
2697 return expand_expr (size_int (r), target, mode, EXPAND_NORMAL);
2700 /* If the first argument is "", return 0. */
2701 if (p1 && *p1 == '\0')
2703 /* Evaluate and ignore argument s2 in case it has
2705 expand_expr (s2, const0_rtx, VOIDmode, EXPAND_NORMAL);
2709 /* If the second argument is "", return __builtin_strlen(s1). */
2710 if (p2 && *p2 == '\0')
2712 tree newarglist = build_tree_list (NULL_TREE, s1),
2713 fn = built_in_decls[BUILT_IN_STRLEN];
2715 /* If the replacement _DECL isn't initialized, don't do the
2720 return expand_expr (build_function_call_expr (fn, newarglist),
2721 target, mode, EXPAND_NORMAL);
2727 /* Expand a call to __builtin_saveregs, generating the result in TARGET,
2728 if that's convenient. */
2731 expand_builtin_saveregs ()
2735 /* Don't do __builtin_saveregs more than once in a function.
2736 Save the result of the first call and reuse it. */
2737 if (saveregs_value != 0)
2738 return saveregs_value;
2740 /* When this function is called, it means that registers must be
2741 saved on entry to this function. So we migrate the call to the
2742 first insn of this function. */
2746 #ifdef EXPAND_BUILTIN_SAVEREGS
2747 /* Do whatever the machine needs done in this case. */
2748 val = EXPAND_BUILTIN_SAVEREGS ();
2750 /* ??? We used to try and build up a call to the out of line function,
2751 guessing about what registers needed saving etc. This became much
2752 harder with __builtin_va_start, since we don't have a tree for a
2753 call to __builtin_saveregs to fall back on. There was exactly one
2754 port (i860) that used this code, and I'm unconvinced it could actually
2755 handle the general case. So we no longer try to handle anything
2756 weird and make the backend absorb the evil. */
2758 error ("__builtin_saveregs not supported by this target");
2765 saveregs_value = val;
2767 /* Put the sequence after the NOTE that starts the function. If this
2768 is inside a SEQUENCE, make the outer-level insn chain current, so
2769 the code is placed at the start of the function. */
2770 push_topmost_sequence ();
2771 emit_insns_after (seq, get_insns ());
2772 pop_topmost_sequence ();
2777 /* __builtin_args_info (N) returns word N of the arg space info
2778 for the current function. The number and meanings of words
2779 is controlled by the definition of CUMULATIVE_ARGS. */
2782 expand_builtin_args_info (exp)
2785 tree arglist = TREE_OPERAND (exp, 1);
2786 int nwords = sizeof (CUMULATIVE_ARGS) / sizeof (int);
2787 int *word_ptr = (int *) ¤t_function_args_info;
2789 /* These are used by the code below that is if 0'ed away */
2791 tree type, elts, result;
2794 if (sizeof (CUMULATIVE_ARGS) % sizeof (int) != 0)
2799 if (!host_integerp (TREE_VALUE (arglist), 0))
2800 error ("argument of `__builtin_args_info' must be constant");
2803 HOST_WIDE_INT wordnum = tree_low_cst (TREE_VALUE (arglist), 0);
2805 if (wordnum < 0 || wordnum >= nwords)
2806 error ("argument of `__builtin_args_info' out of range");
2808 return GEN_INT (word_ptr[wordnum]);
2812 error ("missing argument in `__builtin_args_info'");
2817 for (i = 0; i < nwords; i++)
2818 elts = tree_cons (NULL_TREE, build_int_2 (word_ptr[i], 0));
2820 type = build_array_type (integer_type_node,
2821 build_index_type (build_int_2 (nwords, 0)));
2822 result = build (CONSTRUCTOR, type, NULL_TREE, nreverse (elts));
2823 TREE_CONSTANT (result) = 1;
2824 TREE_STATIC (result) = 1;
2825 result = build1 (INDIRECT_REF, build_pointer_type (type), result);
2826 TREE_CONSTANT (result) = 1;
2827 return expand_expr (result, NULL_RTX, VOIDmode, 0);
2831 /* Expand ARGLIST, from a call to __builtin_next_arg. */
2834 expand_builtin_next_arg (arglist)
2837 tree fntype = TREE_TYPE (current_function_decl);
2839 if ((TYPE_ARG_TYPES (fntype) == 0
2840 || (TREE_VALUE (tree_last (TYPE_ARG_TYPES (fntype)))
2842 && ! current_function_varargs)
2844 error ("`va_start' used in function with fixed args");
2850 tree last_parm = tree_last (DECL_ARGUMENTS (current_function_decl));
2851 tree arg = TREE_VALUE (arglist);
2853 /* Strip off all nops for the sake of the comparison. This
2854 is not quite the same as STRIP_NOPS. It does more.
2855 We must also strip off INDIRECT_EXPR for C++ reference
2857 while (TREE_CODE (arg) == NOP_EXPR
2858 || TREE_CODE (arg) == CONVERT_EXPR
2859 || TREE_CODE (arg) == NON_LVALUE_EXPR
2860 || TREE_CODE (arg) == INDIRECT_REF)
2861 arg = TREE_OPERAND (arg, 0);
2862 if (arg != last_parm)
2863 warning ("second parameter of `va_start' not last named argument");
2865 else if (! current_function_varargs)
2866 /* Evidently an out of date version of <stdarg.h>; can't validate
2867 va_start's second argument, but can still work as intended. */
2868 warning ("`__builtin_next_arg' called without an argument");
2870 return expand_binop (Pmode, add_optab,
2871 current_function_internal_arg_pointer,
2872 current_function_arg_offset_rtx,
2873 NULL_RTX, 0, OPTAB_LIB_WIDEN);
2876 /* Make it easier for the backends by protecting the valist argument
2877 from multiple evaluations. */
2880 stabilize_va_list (valist, needs_lvalue)
2884 if (TREE_CODE (va_list_type_node) == ARRAY_TYPE)
2886 if (TREE_SIDE_EFFECTS (valist))
2887 valist = save_expr (valist);
2889 /* For this case, the backends will be expecting a pointer to
2890 TREE_TYPE (va_list_type_node), but it's possible we've
2891 actually been given an array (an actual va_list_type_node).
2893 if (TREE_CODE (TREE_TYPE (valist)) == ARRAY_TYPE)
2895 tree p1 = build_pointer_type (TREE_TYPE (va_list_type_node));
2896 tree p2 = build_pointer_type (va_list_type_node);
2898 valist = build1 (ADDR_EXPR, p2, valist);
2899 valist = fold (build1 (NOP_EXPR, p1, valist));
2908 if (! TREE_SIDE_EFFECTS (valist))
2911 pt = build_pointer_type (va_list_type_node);
2912 valist = fold (build1 (ADDR_EXPR, pt, valist));
2913 TREE_SIDE_EFFECTS (valist) = 1;
2916 if (TREE_SIDE_EFFECTS (valist))
2917 valist = save_expr (valist);
2918 valist = fold (build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (valist)),
2925 /* The "standard" implementation of va_start: just assign `nextarg' to
2929 std_expand_builtin_va_start (stdarg_p, valist, nextarg)
2938 /* The dummy named parameter is declared as a 'word' sized
2939 object, but if a 'word' is smaller than an 'int', it would
2940 have been promoted to int when it was added to the arglist. */
2941 int align = PARM_BOUNDARY / BITS_PER_UNIT;
2942 int size = MAX (UNITS_PER_WORD,
2943 GET_MODE_SIZE (TYPE_MODE (integer_type_node)));
2944 int offset = ((size + align - 1) / align) * align;
2945 nextarg = plus_constant (nextarg, -offset);
2948 t = build (MODIFY_EXPR, TREE_TYPE (valist), valist,
2949 make_tree (ptr_type_node, nextarg));
2950 TREE_SIDE_EFFECTS (t) = 1;
2952 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
2955 /* Expand ARGLIST, which from a call to __builtin_stdarg_va_start or
2956 __builtin_varargs_va_start, depending on STDARG_P. */
2959 expand_builtin_va_start (stdarg_p, arglist)
2964 tree chain = arglist, valist;
2967 nextarg = expand_builtin_next_arg (chain = TREE_CHAIN (arglist));
2969 nextarg = expand_builtin_next_arg (NULL_TREE);
2971 if (TREE_CHAIN (chain))
2972 error ("too many arguments to function `va_start'");
2974 valist = stabilize_va_list (TREE_VALUE (arglist), 1);
2976 #ifdef EXPAND_BUILTIN_VA_START
2977 EXPAND_BUILTIN_VA_START (stdarg_p, valist, nextarg);
2979 std_expand_builtin_va_start (stdarg_p, valist, nextarg);
2985 /* The "standard" implementation of va_arg: read the value from the
2986 current (padded) address and increment by the (padded) size. */
2989 std_expand_builtin_va_arg (valist, type)
2992 tree addr_tree, t, type_size = NULL;
2993 tree align, alignm1;
2997 /* Compute the rounded size of the type. */
2998 align = size_int (PARM_BOUNDARY / BITS_PER_UNIT);
2999 alignm1 = size_int (PARM_BOUNDARY / BITS_PER_UNIT - 1);
3000 if (type == error_mark_node
3001 || (type_size = TYPE_SIZE_UNIT (TYPE_MAIN_VARIANT (type))) == NULL
3002 || TREE_OVERFLOW (type_size))
3003 rounded_size = size_zero_node;
3005 rounded_size = fold (build (MULT_EXPR, sizetype,
3006 fold (build (TRUNC_DIV_EXPR, sizetype,
3007 fold (build (PLUS_EXPR, sizetype,
3008 type_size, alignm1)),
3014 if (PAD_VARARGS_DOWN && ! integer_zerop (rounded_size))
3016 /* Small args are padded downward. */
3017 addr_tree = fold (build (PLUS_EXPR, TREE_TYPE (addr_tree), addr_tree,
3018 fold (build (COND_EXPR, sizetype,
3019 fold (build (GT_EXPR, sizetype,
3023 fold (build (MINUS_EXPR, sizetype,
3028 addr = expand_expr (addr_tree, NULL_RTX, Pmode, EXPAND_NORMAL);
3029 addr = copy_to_reg (addr);
3031 /* Compute new value for AP. */
3032 if (! integer_zerop (rounded_size))
3034 t = build (MODIFY_EXPR, TREE_TYPE (valist), valist,
3035 build (PLUS_EXPR, TREE_TYPE (valist), valist,
3037 TREE_SIDE_EFFECTS (t) = 1;
3038 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
3044 /* Expand __builtin_va_arg, which is not really a builtin function, but
3045 a very special sort of operator. */
3048 expand_builtin_va_arg (valist, type)
3052 tree promoted_type, want_va_type, have_va_type;
3054 /* Verify that valist is of the proper type. */
3056 want_va_type = va_list_type_node;
3057 have_va_type = TREE_TYPE (valist);
3058 if (TREE_CODE (want_va_type) == ARRAY_TYPE)
3060 /* If va_list is an array type, the argument may have decayed
3061 to a pointer type, e.g. by being passed to another function.
3062 In that case, unwrap both types so that we can compare the
3063 underlying records. */
3064 if (TREE_CODE (have_va_type) == ARRAY_TYPE
3065 || TREE_CODE (have_va_type) == POINTER_TYPE)
3067 want_va_type = TREE_TYPE (want_va_type);
3068 have_va_type = TREE_TYPE (have_va_type);
3071 if (TYPE_MAIN_VARIANT (want_va_type) != TYPE_MAIN_VARIANT (have_va_type))
3073 error ("first argument to `va_arg' not of type `va_list'");
3077 /* Generate a diagnostic for requesting data of a type that cannot
3078 be passed through `...' due to type promotion at the call site. */
3079 else if ((promoted_type = (*lang_type_promotes_to) (type)) != NULL_TREE)
3081 const char *name = "<anonymous type>", *pname = 0;
3082 static bool gave_help;
3084 if (TYPE_NAME (type))
3086 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
3087 name = IDENTIFIER_POINTER (TYPE_NAME (type));
3088 else if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
3089 && DECL_NAME (TYPE_NAME (type)))
3090 name = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type)));
3092 if (TYPE_NAME (promoted_type))
3094 if (TREE_CODE (TYPE_NAME (promoted_type)) == IDENTIFIER_NODE)
3095 pname = IDENTIFIER_POINTER (TYPE_NAME (promoted_type));
3096 else if (TREE_CODE (TYPE_NAME (promoted_type)) == TYPE_DECL
3097 && DECL_NAME (TYPE_NAME (promoted_type)))
3098 pname = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (promoted_type)));
3101 /* Unfortunately, this is merely undefined, rather than a constraint
3102 violation, so we cannot make this an error. If this call is never
3103 executed, the program is still strictly conforming. */
3104 warning ("`%s' is promoted to `%s' when passed through `...'",
3109 warning ("(so you should pass `%s' not `%s' to `va_arg')",
3113 /* We can, however, treat "undefined" any way we please.
3114 Call abort to encourage the user to fix the program. */
3115 expand_builtin_trap ();
3117 /* This is dead code, but go ahead and finish so that the
3118 mode of the result comes out right. */
3123 /* Make it easier for the backends by protecting the valist argument
3124 from multiple evaluations. */
3125 valist = stabilize_va_list (valist, 0);
3127 #ifdef EXPAND_BUILTIN_VA_ARG
3128 addr = EXPAND_BUILTIN_VA_ARG (valist, type);
3130 addr = std_expand_builtin_va_arg (valist, type);
3134 #ifdef POINTERS_EXTEND_UNSIGNED
3135 if (GET_MODE (addr) != Pmode)
3136 addr = convert_memory_address (Pmode, addr);
3139 result = gen_rtx_MEM (TYPE_MODE (type), addr);
3140 set_mem_alias_set (result, get_varargs_alias_set ());
3145 /* Expand ARGLIST, from a call to __builtin_va_end. */
3148 expand_builtin_va_end (arglist)
3151 tree valist = TREE_VALUE (arglist);
3153 #ifdef EXPAND_BUILTIN_VA_END
3154 valist = stabilize_va_list (valist, 0);
3155 EXPAND_BUILTIN_VA_END(arglist);
3157 /* Evaluate for side effects, if needed. I hate macros that don't
3159 if (TREE_SIDE_EFFECTS (valist))
3160 expand_expr (valist, const0_rtx, VOIDmode, EXPAND_NORMAL);
3166 /* Expand ARGLIST, from a call to __builtin_va_copy. We do this as a
3167 builtin rather than just as an assignment in stdarg.h because of the
3168 nastiness of array-type va_list types. */
3171 expand_builtin_va_copy (arglist)
3176 dst = TREE_VALUE (arglist);
3177 src = TREE_VALUE (TREE_CHAIN (arglist));
3179 dst = stabilize_va_list (dst, 1);
3180 src = stabilize_va_list (src, 0);
3182 if (TREE_CODE (va_list_type_node) != ARRAY_TYPE)
3184 t = build (MODIFY_EXPR, va_list_type_node, dst, src);
3185 TREE_SIDE_EFFECTS (t) = 1;
3186 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
3190 rtx dstb, srcb, size;
3192 /* Evaluate to pointers. */
3193 dstb = expand_expr (dst, NULL_RTX, Pmode, EXPAND_NORMAL);
3194 srcb = expand_expr (src, NULL_RTX, Pmode, EXPAND_NORMAL);
3195 size = expand_expr (TYPE_SIZE_UNIT (va_list_type_node), NULL_RTX,
3196 VOIDmode, EXPAND_NORMAL);
3198 #ifdef POINTERS_EXTEND_UNSIGNED
3199 if (GET_MODE (dstb) != Pmode)
3200 dstb = convert_memory_address (Pmode, dstb);
3202 if (GET_MODE (srcb) != Pmode)
3203 srcb = convert_memory_address (Pmode, srcb);
3206 /* "Dereference" to BLKmode memories. */
3207 dstb = gen_rtx_MEM (BLKmode, dstb);
3208 set_mem_alias_set (dstb, get_alias_set (TREE_TYPE (TREE_TYPE (dst))));
3209 set_mem_align (dstb, TYPE_ALIGN (va_list_type_node));
3210 srcb = gen_rtx_MEM (BLKmode, srcb);
3211 set_mem_alias_set (srcb, get_alias_set (TREE_TYPE (TREE_TYPE (src))));
3212 set_mem_align (srcb, TYPE_ALIGN (va_list_type_node));
3215 emit_block_move (dstb, srcb, size);
3221 /* Expand a call to one of the builtin functions __builtin_frame_address or
3222 __builtin_return_address. */
3225 expand_builtin_frame_address (exp)
3228 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
3229 tree arglist = TREE_OPERAND (exp, 1);
3231 /* The argument must be a nonnegative integer constant.
3232 It counts the number of frames to scan up the stack.
3233 The value is the return address saved in that frame. */
3235 /* Warning about missing arg was already issued. */
3237 else if (! host_integerp (TREE_VALUE (arglist), 1))
3239 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
3240 error ("invalid arg to `__builtin_frame_address'");
3242 error ("invalid arg to `__builtin_return_address'");
3248 = expand_builtin_return_addr (DECL_FUNCTION_CODE (fndecl),
3249 tree_low_cst (TREE_VALUE (arglist), 1),
3250 hard_frame_pointer_rtx);
3252 /* Some ports cannot access arbitrary stack frames. */
3255 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
3256 warning ("unsupported arg to `__builtin_frame_address'");
3258 warning ("unsupported arg to `__builtin_return_address'");
3262 /* For __builtin_frame_address, return what we've got. */
3263 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
3266 if (GET_CODE (tem) != REG
3267 && ! CONSTANT_P (tem))
3268 tem = copy_to_mode_reg (Pmode, tem);
3273 /* Expand a call to the alloca builtin, with arguments ARGLIST. Return 0 if
3274 we failed and the caller should emit a normal call, otherwise try to get
3275 the result in TARGET, if convenient. */
3278 expand_builtin_alloca (arglist, target)
3285 if (!validate_arglist (arglist, INTEGER_TYPE, VOID_TYPE))
3288 /* Compute the argument. */
3289 op0 = expand_expr (TREE_VALUE (arglist), NULL_RTX, VOIDmode, 0);
3291 /* Allocate the desired space. */
3292 result = allocate_dynamic_stack_space (op0, target, BITS_PER_UNIT);
3294 #ifdef POINTERS_EXTEND_UNSIGNED
3295 if (GET_MODE (result) != ptr_mode)
3296 result = convert_memory_address (ptr_mode, result);
3302 /* Expand a call to the ffs builtin. The arguments are in ARGLIST.
3303 Return 0 if a normal call should be emitted rather than expanding the
3304 function in-line. If convenient, the result should be placed in TARGET.
3305 SUBTARGET may be used as the target for computing one of EXP's operands. */
3308 expand_builtin_ffs (arglist, target, subtarget)
3310 rtx target, subtarget;
3313 if (!validate_arglist (arglist, INTEGER_TYPE, VOID_TYPE))
3316 /* Compute the argument. */
3317 op0 = expand_expr (TREE_VALUE (arglist), subtarget, VOIDmode, 0);
3318 /* Compute ffs, into TARGET if possible.
3319 Set TARGET to wherever the result comes back. */
3320 target = expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist))),
3321 ffs_optab, op0, target, 1);
3327 /* If the string passed to fputs is a constant and is one character
3328 long, we attempt to transform this call into __builtin_fputc(). */
3331 expand_builtin_fputs (arglist, ignore, unlocked)
3337 tree fn_fputc = unlocked ? built_in_decls[BUILT_IN_FPUTC_UNLOCKED]
3338 : built_in_decls[BUILT_IN_FPUTC];
3339 tree fn_fwrite = unlocked ? built_in_decls[BUILT_IN_FWRITE_UNLOCKED]
3340 : built_in_decls[BUILT_IN_FWRITE];
3342 /* If the return value is used, or the replacement _DECL isn't
3343 initialized, don't do the transformation. */
3344 if (!ignore || !fn_fputc || !fn_fwrite)
3347 /* Verify the arguments in the original call. */
3348 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
3351 /* Get the length of the string passed to fputs. If the length
3352 can't be determined, punt. */
3353 if (!(len = c_strlen (TREE_VALUE (arglist)))
3354 || TREE_CODE (len) != INTEGER_CST)
3357 switch (compare_tree_int (len, 1))
3359 case -1: /* length is 0, delete the call entirely . */
3361 /* Evaluate and ignore the argument in case it has
3363 expand_expr (TREE_VALUE (TREE_CHAIN (arglist)), const0_rtx,
3364 VOIDmode, EXPAND_NORMAL);
3367 case 0: /* length is 1, call fputc. */
3369 const char *p = c_getstr (TREE_VALUE (arglist));
3373 /* New argument list transforming fputs(string, stream) to
3374 fputc(string[0], stream). */
3376 build_tree_list (NULL_TREE, TREE_VALUE (TREE_CHAIN (arglist)));
3378 tree_cons (NULL_TREE, build_int_2 (p[0], 0), arglist);
3384 case 1: /* length is greater than 1, call fwrite. */
3386 tree string_arg = TREE_VALUE (arglist);
3388 /* New argument list transforming fputs(string, stream) to
3389 fwrite(string, 1, len, stream). */
3390 arglist = build_tree_list (NULL_TREE, TREE_VALUE (TREE_CHAIN (arglist)));
3391 arglist = tree_cons (NULL_TREE, len, arglist);
3392 arglist = tree_cons (NULL_TREE, size_one_node, arglist);
3393 arglist = tree_cons (NULL_TREE, string_arg, arglist);
3401 return expand_expr (build_function_call_expr (fn, arglist),
3402 (ignore ? const0_rtx : NULL_RTX),
3403 VOIDmode, EXPAND_NORMAL);
3406 /* Expand a call to __builtin_expect. We return our argument and emit a
3407 NOTE_INSN_EXPECTED_VALUE note. This is the expansion of __builtin_expect in
3408 a non-jump context. */
3411 expand_builtin_expect (arglist, target)
3418 if (arglist == NULL_TREE
3419 || TREE_CHAIN (arglist) == NULL_TREE)
3421 exp = TREE_VALUE (arglist);
3422 c = TREE_VALUE (TREE_CHAIN (arglist));
3424 if (TREE_CODE (c) != INTEGER_CST)
3426 error ("second arg to `__builtin_expect' must be a constant");
3427 c = integer_zero_node;
3430 target = expand_expr (exp, target, VOIDmode, EXPAND_NORMAL);
3432 /* Don't bother with expected value notes for integral constants. */
3433 if (GET_CODE (target) != CONST_INT)
3435 /* We do need to force this into a register so that we can be
3436 moderately sure to be able to correctly interpret the branch
3438 target = force_reg (GET_MODE (target), target);
3440 rtx_c = expand_expr (c, NULL_RTX, GET_MODE (target), EXPAND_NORMAL);
3442 note = emit_note (NULL, NOTE_INSN_EXPECTED_VALUE);
3443 NOTE_EXPECTED_VALUE (note) = gen_rtx_EQ (VOIDmode, target, rtx_c);
3449 /* Like expand_builtin_expect, except do this in a jump context. This is
3450 called from do_jump if the conditional is a __builtin_expect. Return either
3451 a SEQUENCE of insns to emit the jump or NULL if we cannot optimize
3452 __builtin_expect. We need to optimize this at jump time so that machines
3453 like the PowerPC don't turn the test into a SCC operation, and then jump
3454 based on the test being 0/1. */
3457 expand_builtin_expect_jump (exp, if_false_label, if_true_label)
3462 tree arglist = TREE_OPERAND (exp, 1);
3463 tree arg0 = TREE_VALUE (arglist);
3464 tree arg1 = TREE_VALUE (TREE_CHAIN (arglist));
3467 /* Only handle __builtin_expect (test, 0) and
3468 __builtin_expect (test, 1). */
3469 if (TREE_CODE (TREE_TYPE (arg1)) == INTEGER_TYPE
3470 && (integer_zerop (arg1) || integer_onep (arg1)))
3475 /* If we fail to locate an appropriate conditional jump, we'll
3476 fall back to normal evaluation. Ensure that the expression
3477 can be re-evaluated. */
3478 switch (unsafe_for_reeval (arg0))
3483 case 1: /* Mildly unsafe. */
3484 arg0 = unsave_expr (arg0);
3487 case 2: /* Wildly unsafe. */
3491 /* Expand the jump insns. */
3493 do_jump (arg0, if_false_label, if_true_label);
3494 ret = gen_sequence ();
3497 /* Now that the __builtin_expect has been validated, go through and add
3498 the expect's to each of the conditional jumps. If we run into an
3499 error, just give up and generate the 'safe' code of doing a SCC
3500 operation and then doing a branch on that. */
3501 for (j = 0; j < XVECLEN (ret, 0); j++)
3503 rtx insn = XVECEXP (ret, 0, j);
3506 if (GET_CODE (insn) == JUMP_INSN && any_condjump_p (insn)
3507 && (pattern = pc_set (insn)) != NULL_RTX)
3509 rtx ifelse = SET_SRC (pattern);
3513 if (GET_CODE (ifelse) != IF_THEN_ELSE)
3516 if (GET_CODE (XEXP (ifelse, 1)) == LABEL_REF)
3519 label = XEXP (XEXP (ifelse, 1), 0);
3521 /* An inverted jump reverses the probabilities. */
3522 else if (GET_CODE (XEXP (ifelse, 2)) == LABEL_REF)
3525 label = XEXP (XEXP (ifelse, 2), 0);
3527 /* We shouldn't have to worry about conditional returns during
3528 the expansion stage, but handle it gracefully anyway. */
3529 else if (GET_CODE (XEXP (ifelse, 1)) == RETURN)
3534 /* An inverted return reverses the probabilities. */
3535 else if (GET_CODE (XEXP (ifelse, 2)) == RETURN)
3543 /* If the test is expected to fail, reverse the
3545 if (integer_zerop (arg1))
3548 /* If we are jumping to the false label, reverse the
3550 if (label == NULL_RTX)
3551 ; /* conditional return */
3552 else if (label == if_false_label)
3554 else if (label != if_true_label)
3558 predict_insn_def (insn, PRED_BUILTIN_EXPECT, taken);
3562 /* If no jumps were modified, fail and do __builtin_expect the normal
3572 expand_builtin_trap ()
3576 emit_insn (gen_trap ());
3579 emit_library_call (abort_libfunc, LCT_NORETURN, VOIDmode, 0);
3583 /* Expand an expression EXP that calls a built-in function,
3584 with result going to TARGET if that's convenient
3585 (and in mode MODE if that's convenient).
3586 SUBTARGET may be used as the target for computing one of EXP's operands.
3587 IGNORE is nonzero if the value is to be ignored. */
3590 expand_builtin (exp, target, subtarget, mode, ignore)
3594 enum machine_mode mode;
3597 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
3598 tree arglist = TREE_OPERAND (exp, 1);
3599 enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
3601 if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_MD)
3602 return (*targetm.expand_builtin) (exp, target, subtarget, mode, ignore);
3604 /* When not optimizing, generate calls to library functions for a certain
3606 if (!optimize && !CALLED_AS_BUILT_IN (fndecl))
3612 case BUILT_IN_SQRTF:
3613 case BUILT_IN_SQRTL:
3614 case BUILT_IN_MEMSET:
3615 case BUILT_IN_MEMCPY:
3616 case BUILT_IN_MEMCMP:
3618 case BUILT_IN_BZERO:
3619 case BUILT_IN_INDEX:
3620 case BUILT_IN_RINDEX:
3621 case BUILT_IN_STRCHR:
3622 case BUILT_IN_STRRCHR:
3623 case BUILT_IN_STRLEN:
3624 case BUILT_IN_STRCPY:
3625 case BUILT_IN_STRNCPY:
3626 case BUILT_IN_STRNCMP:
3627 case BUILT_IN_STRSTR:
3628 case BUILT_IN_STRPBRK:
3629 case BUILT_IN_STRCAT:
3630 case BUILT_IN_STRNCAT:
3631 case BUILT_IN_STRSPN:
3632 case BUILT_IN_STRCSPN:
3633 case BUILT_IN_STRCMP:
3635 case BUILT_IN_PUTCHAR:
3637 case BUILT_IN_PRINTF:
3638 case BUILT_IN_FPUTC:
3639 case BUILT_IN_FPUTS:
3640 case BUILT_IN_FWRITE:
3641 case BUILT_IN_PUTCHAR_UNLOCKED:
3642 case BUILT_IN_PUTS_UNLOCKED:
3643 case BUILT_IN_PRINTF_UNLOCKED:
3644 case BUILT_IN_FPUTC_UNLOCKED:
3645 case BUILT_IN_FPUTS_UNLOCKED:
3646 case BUILT_IN_FWRITE_UNLOCKED:
3647 return expand_call (exp, target, ignore);
3657 case BUILT_IN_LLABS:
3658 case BUILT_IN_IMAXABS:
3660 case BUILT_IN_FABSF:
3661 case BUILT_IN_FABSL:
3662 /* build_function_call changes these into ABS_EXPR. */
3666 case BUILT_IN_CONJF:
3667 case BUILT_IN_CONJL:
3668 case BUILT_IN_CREAL:
3669 case BUILT_IN_CREALF:
3670 case BUILT_IN_CREALL:
3671 case BUILT_IN_CIMAG:
3672 case BUILT_IN_CIMAGF:
3673 case BUILT_IN_CIMAGL:
3674 /* expand_tree_builtin changes these into CONJ_EXPR, REALPART_EXPR
3675 and IMAGPART_EXPR. */
3684 /* Treat these like sqrt only if unsafe math optimizations are allowed,
3685 because of possible accuracy problems. */
3686 if (! flag_unsafe_math_optimizations)
3689 case BUILT_IN_SQRTF:
3690 case BUILT_IN_SQRTL:
3691 target = expand_builtin_mathfn (exp, target, subtarget);
3699 case BUILT_IN_APPLY_ARGS:
3700 return expand_builtin_apply_args ();
3702 /* __builtin_apply (FUNCTION, ARGUMENTS, ARGSIZE) invokes
3703 FUNCTION with a copy of the parameters described by
3704 ARGUMENTS, and ARGSIZE. It returns a block of memory
3705 allocated on the stack into which is stored all the registers
3706 that might possibly be used for returning the result of a
3707 function. ARGUMENTS is the value returned by
3708 __builtin_apply_args. ARGSIZE is the number of bytes of
3709 arguments that must be copied. ??? How should this value be
3710 computed? We'll also need a safe worst case value for varargs
3712 case BUILT_IN_APPLY:
3713 if (!validate_arglist (arglist, POINTER_TYPE,
3714 POINTER_TYPE, INTEGER_TYPE, VOID_TYPE)
3715 && !validate_arglist (arglist, REFERENCE_TYPE,
3716 POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
3724 for (t = arglist, i = 0; t; t = TREE_CHAIN (t), i++)
3725 ops[i] = expand_expr (TREE_VALUE (t), NULL_RTX, VOIDmode, 0);
3727 return expand_builtin_apply (ops[0], ops[1], ops[2]);
3730 /* __builtin_return (RESULT) causes the function to return the
3731 value described by RESULT. RESULT is address of the block of
3732 memory returned by __builtin_apply. */
3733 case BUILT_IN_RETURN:
3734 if (validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
3735 expand_builtin_return (expand_expr (TREE_VALUE (arglist),
3736 NULL_RTX, VOIDmode, 0));
3739 case BUILT_IN_SAVEREGS:
3740 return expand_builtin_saveregs ();
3742 case BUILT_IN_ARGS_INFO:
3743 return expand_builtin_args_info (exp);
3745 /* Return the address of the first anonymous stack arg. */
3746 case BUILT_IN_NEXT_ARG:
3747 return expand_builtin_next_arg (arglist);
3749 case BUILT_IN_CLASSIFY_TYPE:
3750 return expand_builtin_classify_type (arglist);
3752 case BUILT_IN_CONSTANT_P:
3753 return expand_builtin_constant_p (exp);
3755 case BUILT_IN_FRAME_ADDRESS:
3756 case BUILT_IN_RETURN_ADDRESS:
3757 return expand_builtin_frame_address (exp);
3759 /* Returns the address of the area where the structure is returned.
3761 case BUILT_IN_AGGREGATE_INCOMING_ADDRESS:
3763 || ! AGGREGATE_TYPE_P (TREE_TYPE (TREE_TYPE (current_function_decl)))
3764 || GET_CODE (DECL_RTL (DECL_RESULT (current_function_decl))) != MEM)
3767 return XEXP (DECL_RTL (DECL_RESULT (current_function_decl)), 0);
3769 case BUILT_IN_ALLOCA:
3770 target = expand_builtin_alloca (arglist, target);
3776 target = expand_builtin_ffs (arglist, target, subtarget);
3781 case BUILT_IN_STRLEN:
3782 target = expand_builtin_strlen (exp, target);
3787 case BUILT_IN_STRCPY:
3788 target = expand_builtin_strcpy (exp, target, mode);
3793 case BUILT_IN_STRNCPY:
3794 target = expand_builtin_strncpy (arglist, target, mode);
3799 case BUILT_IN_STRCAT:
3800 target = expand_builtin_strcat (arglist, target, mode);
3805 case BUILT_IN_STRNCAT:
3806 target = expand_builtin_strncat (arglist, target, mode);
3811 case BUILT_IN_STRSPN:
3812 target = expand_builtin_strspn (arglist, target, mode);
3817 case BUILT_IN_STRCSPN:
3818 target = expand_builtin_strcspn (arglist, target, mode);
3823 case BUILT_IN_STRSTR:
3824 target = expand_builtin_strstr (arglist, target, mode);
3829 case BUILT_IN_STRPBRK:
3830 target = expand_builtin_strpbrk (arglist, target, mode);
3835 case BUILT_IN_INDEX:
3836 case BUILT_IN_STRCHR:
3837 target = expand_builtin_strchr (arglist, target, mode);
3842 case BUILT_IN_RINDEX:
3843 case BUILT_IN_STRRCHR:
3844 target = expand_builtin_strrchr (arglist, target, mode);
3849 case BUILT_IN_MEMCPY:
3850 target = expand_builtin_memcpy (arglist, target, mode);
3855 case BUILT_IN_MEMSET:
3856 target = expand_builtin_memset (exp, target, mode);
3861 case BUILT_IN_BZERO:
3862 target = expand_builtin_bzero (exp);
3867 case BUILT_IN_STRCMP:
3868 target = expand_builtin_strcmp (exp, target, mode);
3873 case BUILT_IN_STRNCMP:
3874 target = expand_builtin_strncmp (exp, target, mode);
3880 case BUILT_IN_MEMCMP:
3881 target = expand_builtin_memcmp (exp, arglist, target, mode);
3886 case BUILT_IN_SETJMP:
3887 target = expand_builtin_setjmp (arglist, target);
3892 /* __builtin_longjmp is passed a pointer to an array of five words.
3893 It's similar to the C library longjmp function but works with
3894 __builtin_setjmp above. */
3895 case BUILT_IN_LONGJMP:
3896 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
3900 rtx buf_addr = expand_expr (TREE_VALUE (arglist), subtarget,
3902 rtx value = expand_expr (TREE_VALUE (TREE_CHAIN (arglist)),
3903 NULL_RTX, VOIDmode, 0);
3905 if (value != const1_rtx)
3907 error ("__builtin_longjmp second argument must be 1");
3911 expand_builtin_longjmp (buf_addr, value);
3916 expand_builtin_trap ();
3919 case BUILT_IN_PUTCHAR:
3921 case BUILT_IN_FPUTC:
3922 case BUILT_IN_FWRITE:
3923 case BUILT_IN_PUTCHAR_UNLOCKED:
3924 case BUILT_IN_PUTS_UNLOCKED:
3925 case BUILT_IN_FPUTC_UNLOCKED:
3926 case BUILT_IN_FWRITE_UNLOCKED:
3928 case BUILT_IN_FPUTS:
3929 target = expand_builtin_fputs (arglist, ignore,/*unlocked=*/ 0);
3933 case BUILT_IN_FPUTS_UNLOCKED:
3934 target = expand_builtin_fputs (arglist, ignore,/*unlocked=*/ 1);
3939 /* Various hooks for the DWARF 2 __throw routine. */
3940 case BUILT_IN_UNWIND_INIT:
3941 expand_builtin_unwind_init ();
3943 case BUILT_IN_DWARF_CFA:
3944 return virtual_cfa_rtx;
3945 #ifdef DWARF2_UNWIND_INFO
3946 case BUILT_IN_DWARF_FP_REGNUM:
3947 return expand_builtin_dwarf_fp_regnum ();
3948 case BUILT_IN_INIT_DWARF_REG_SIZES:
3949 expand_builtin_init_dwarf_reg_sizes (TREE_VALUE (arglist));
3952 case BUILT_IN_FROB_RETURN_ADDR:
3953 return expand_builtin_frob_return_addr (TREE_VALUE (arglist));
3954 case BUILT_IN_EXTRACT_RETURN_ADDR:
3955 return expand_builtin_extract_return_addr (TREE_VALUE (arglist));
3956 case BUILT_IN_EH_RETURN:
3957 expand_builtin_eh_return (TREE_VALUE (arglist),
3958 TREE_VALUE (TREE_CHAIN (arglist)));
3960 #ifdef EH_RETURN_DATA_REGNO
3961 case BUILT_IN_EH_RETURN_DATA_REGNO:
3962 return expand_builtin_eh_return_data_regno (arglist);
3964 case BUILT_IN_VARARGS_START:
3965 return expand_builtin_va_start (0, arglist);
3966 case BUILT_IN_STDARG_START:
3967 return expand_builtin_va_start (1, arglist);
3968 case BUILT_IN_VA_END:
3969 return expand_builtin_va_end (arglist);
3970 case BUILT_IN_VA_COPY:
3971 return expand_builtin_va_copy (arglist);
3972 case BUILT_IN_EXPECT:
3973 return expand_builtin_expect (arglist, target);
3974 case BUILT_IN_PREFETCH:
3975 expand_builtin_prefetch (arglist);
3979 default: /* just do library call, if unknown builtin */
3980 error ("built-in function `%s' not currently supported",
3981 IDENTIFIER_POINTER (DECL_NAME (fndecl)));
3984 /* The switch statement above can drop through to cause the function
3985 to be called normally. */
3986 return expand_call (exp, target, ignore);
3989 /* Fold a call to __builtin_constant_p, if we know it will evaluate to a
3990 constant. ARGLIST is the argument list of the call. */
3993 fold_builtin_constant_p (arglist)
3999 arglist = TREE_VALUE (arglist);
4001 /* We return 1 for a numeric type that's known to be a constant
4002 value at compile-time or for an aggregate type that's a
4003 literal constant. */
4004 STRIP_NOPS (arglist);
4006 /* If we know this is a constant, emit the constant of one. */
4007 if (TREE_CODE_CLASS (TREE_CODE (arglist)) == 'c'
4008 || (TREE_CODE (arglist) == CONSTRUCTOR
4009 && TREE_CONSTANT (arglist))
4010 || (TREE_CODE (arglist) == ADDR_EXPR
4011 && TREE_CODE (TREE_OPERAND (arglist, 0)) == STRING_CST))
4012 return integer_one_node;
4014 /* If we aren't going to be running CSE or this expression
4015 has side effects, show we don't know it to be a constant.
4016 Likewise if it's a pointer or aggregate type since in those
4017 case we only want literals, since those are only optimized
4018 when generating RTL, not later.
4019 And finally, if we are compiling an initializer, not code, we
4020 need to return a definite result now; there's not going to be any
4021 more optimization done. */
4022 if (TREE_SIDE_EFFECTS (arglist) || cse_not_expected
4023 || AGGREGATE_TYPE_P (TREE_TYPE (arglist))
4024 || POINTER_TYPE_P (TREE_TYPE (arglist))
4026 return integer_zero_node;
4031 /* Fold a call to __builtin_classify_type. */
4034 fold_builtin_classify_type (arglist)
4038 return build_int_2 (no_type_class, 0);
4040 return build_int_2 (type_to_class (TREE_TYPE (TREE_VALUE (arglist))), 0);
4043 /* Used by constant folding to eliminate some builtin calls early. EXP is
4044 the CALL_EXPR of a call to a builtin function. */
4050 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
4051 tree arglist = TREE_OPERAND (exp, 1);
4052 enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
4054 if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_MD)
4059 case BUILT_IN_CONSTANT_P:
4060 return fold_builtin_constant_p (arglist);
4062 case BUILT_IN_CLASSIFY_TYPE:
4063 return fold_builtin_classify_type (arglist);
4065 case BUILT_IN_STRLEN:
4066 if (validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
4068 tree len = c_strlen (TREE_VALUE (arglist));
4082 build_function_call_expr (fn, arglist)
4087 call_expr = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (fn)), fn);
4088 call_expr = build (CALL_EXPR, TREE_TYPE (TREE_TYPE (fn)),
4089 call_expr, arglist);
4090 TREE_SIDE_EFFECTS (call_expr) = 1;
4091 return fold (call_expr);
4094 /* This function validates the types of a function call argument list
4095 represented as a tree chain of parameters against a specified list
4096 of tree_codes. If the last specifier is a 0, that represents an
4097 ellipses, otherwise the last specifier must be a VOID_TYPE. */
4100 validate_arglist VPARAMS ((tree arglist, ...))
4102 enum tree_code code;
4105 VA_OPEN (ap, arglist);
4106 VA_FIXEDARG (ap, tree, arglist);
4109 code = va_arg (ap, enum tree_code);
4113 /* This signifies an ellipses, any further arguments are all ok. */
4117 /* This signifies an endlink, if no arguments remain, return
4118 true, otherwise return false. */
4122 /* If no parameters remain or the parameter's code does not
4123 match the specified code, return false. Otherwise continue
4124 checking any remaining arguments. */
4125 if (arglist == 0 || code != TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))))
4129 arglist = TREE_CHAIN (arglist);
4132 /* We need gotos here since we can only have one VA_CLOSE in a
4140 /* Default version of target-specific builtin setup that does nothing. */
4143 default_init_builtins ()
4147 /* Default target-specific builtin expander that does nothing. */
4150 default_expand_builtin (exp, target, subtarget, mode, ignore)
4151 tree exp ATTRIBUTE_UNUSED;
4152 rtx target ATTRIBUTE_UNUSED;
4153 rtx subtarget ATTRIBUTE_UNUSED;
4154 enum machine_mode mode ATTRIBUTE_UNUSED;
4155 int ignore ATTRIBUTE_UNUSED;