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
32 #include "hard-reg-set.h"
35 #include "insn-config.h"
41 #include "typeclass.h"
47 #define CALLED_AS_BUILT_IN(NODE) \
48 (!strncmp (IDENTIFIER_POINTER (DECL_NAME (NODE)), "__builtin_", 10))
50 /* Register mappings for target machines without register windows. */
51 #ifndef INCOMING_REGNO
52 #define INCOMING_REGNO(OUT) (OUT)
54 #ifndef OUTGOING_REGNO
55 #define OUTGOING_REGNO(IN) (IN)
58 #ifndef PAD_VARARGS_DOWN
59 #define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
62 /* Define the names of the builtin function types and codes. */
63 const char *const built_in_class_names[4]
64 = {"NOT_BUILT_IN", "BUILT_IN_FRONTEND", "BUILT_IN_MD", "BUILT_IN_NORMAL"};
66 #define DEF_BUILTIN(X, N, C, T, LT, B, F, NA) STRINGX(X),
67 const char *const built_in_names[(int) END_BUILTINS] =
69 #include "builtins.def"
73 /* Setup an array of _DECL trees, make sure each element is
74 initialized to NULL_TREE. */
75 tree built_in_decls[(int) END_BUILTINS];
77 tree (*lang_type_promotes_to) PARAMS ((tree));
79 static int get_pointer_alignment PARAMS ((tree, unsigned int));
80 static tree c_strlen PARAMS ((tree));
81 static const char *c_getstr PARAMS ((tree));
82 static rtx c_readstr PARAMS ((const char *,
84 static int target_char_cast PARAMS ((tree, char *));
85 static rtx get_memory_rtx PARAMS ((tree));
86 static int apply_args_size PARAMS ((void));
87 static int apply_result_size PARAMS ((void));
88 #if defined (HAVE_untyped_call) || defined (HAVE_untyped_return)
89 static rtx result_vector PARAMS ((int, rtx));
91 static rtx expand_builtin_setjmp PARAMS ((tree, rtx));
92 static void expand_builtin_prefetch PARAMS ((tree));
93 static rtx expand_builtin_apply_args PARAMS ((void));
94 static rtx expand_builtin_apply_args_1 PARAMS ((void));
95 static rtx expand_builtin_apply PARAMS ((rtx, rtx, rtx));
96 static void expand_builtin_return PARAMS ((rtx));
97 static enum type_class type_to_class PARAMS ((tree));
98 static rtx expand_builtin_classify_type PARAMS ((tree));
99 static rtx expand_builtin_mathfn PARAMS ((tree, rtx, rtx));
100 static rtx expand_builtin_constant_p PARAMS ((tree));
101 static rtx expand_builtin_args_info PARAMS ((tree));
102 static rtx expand_builtin_next_arg PARAMS ((tree));
103 static rtx expand_builtin_va_start PARAMS ((int, tree));
104 static rtx expand_builtin_va_end PARAMS ((tree));
105 static rtx expand_builtin_va_copy PARAMS ((tree));
106 static rtx expand_builtin_memcmp PARAMS ((tree, tree, rtx,
108 static rtx expand_builtin_strcmp PARAMS ((tree, rtx,
110 static rtx expand_builtin_strncmp PARAMS ((tree, rtx,
112 static rtx builtin_memcpy_read_str PARAMS ((PTR, HOST_WIDE_INT,
114 static rtx expand_builtin_strcat PARAMS ((tree, rtx,
116 static rtx expand_builtin_strncat PARAMS ((tree, rtx,
118 static rtx expand_builtin_strspn PARAMS ((tree, rtx,
120 static rtx expand_builtin_strcspn PARAMS ((tree, rtx,
122 static rtx expand_builtin_memcpy PARAMS ((tree, rtx,
124 static rtx expand_builtin_strcpy PARAMS ((tree, rtx,
126 static rtx builtin_strncpy_read_str PARAMS ((PTR, HOST_WIDE_INT,
128 static rtx expand_builtin_strncpy PARAMS ((tree, rtx,
130 static rtx builtin_memset_read_str PARAMS ((PTR, HOST_WIDE_INT,
132 static rtx expand_builtin_memset PARAMS ((tree, rtx,
134 static rtx expand_builtin_bzero PARAMS ((tree));
135 static rtx expand_builtin_strlen PARAMS ((tree, rtx));
136 static rtx expand_builtin_strstr PARAMS ((tree, rtx,
138 static rtx expand_builtin_strpbrk PARAMS ((tree, rtx,
140 static rtx expand_builtin_strchr PARAMS ((tree, rtx,
142 static rtx expand_builtin_strrchr PARAMS ((tree, rtx,
144 static rtx expand_builtin_alloca PARAMS ((tree, rtx));
145 static rtx expand_builtin_ffs PARAMS ((tree, rtx, rtx));
146 static rtx expand_builtin_frame_address PARAMS ((tree));
147 static rtx expand_builtin_fputs PARAMS ((tree, int, int));
148 static tree stabilize_va_list PARAMS ((tree, int));
149 static rtx expand_builtin_expect PARAMS ((tree, rtx));
150 static tree fold_builtin_constant_p PARAMS ((tree));
151 static tree fold_builtin_classify_type PARAMS ((tree));
152 static tree build_function_call_expr PARAMS ((tree, tree));
153 static int validate_arglist PARAMS ((tree, ...));
155 /* Return the alignment in bits of EXP, a pointer valued expression.
156 But don't return more than MAX_ALIGN no matter what.
157 The alignment returned is, by default, the alignment of the thing that
158 EXP points to. If it is not a POINTER_TYPE, 0 is returned.
160 Otherwise, look at the expression to see if we can do better, i.e., if the
161 expression is actually pointing at an object whose alignment is tighter. */
164 get_pointer_alignment (exp, max_align)
166 unsigned int max_align;
168 unsigned int align, inner;
170 if (TREE_CODE (TREE_TYPE (exp)) != POINTER_TYPE)
173 align = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp)));
174 align = MIN (align, max_align);
178 switch (TREE_CODE (exp))
182 case NON_LVALUE_EXPR:
183 exp = TREE_OPERAND (exp, 0);
184 if (TREE_CODE (TREE_TYPE (exp)) != POINTER_TYPE)
187 inner = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp)));
188 align = MIN (inner, max_align);
192 /* If sum of pointer + int, restrict our maximum alignment to that
193 imposed by the integer. If not, we can't do any better than
195 if (! host_integerp (TREE_OPERAND (exp, 1), 1))
198 while (((tree_low_cst (TREE_OPERAND (exp, 1), 1))
199 & (max_align / BITS_PER_UNIT - 1))
203 exp = TREE_OPERAND (exp, 0);
207 /* See what we are pointing at and look at its alignment. */
208 exp = TREE_OPERAND (exp, 0);
209 if (TREE_CODE (exp) == FUNCTION_DECL)
210 align = FUNCTION_BOUNDARY;
211 else if (DECL_P (exp))
212 align = DECL_ALIGN (exp);
213 #ifdef CONSTANT_ALIGNMENT
214 else if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'c')
215 align = CONSTANT_ALIGNMENT (exp, align);
217 return MIN (align, max_align);
225 /* Compute the length of a C string. TREE_STRING_LENGTH is not the right
226 way, because it could contain a zero byte in the middle.
227 TREE_STRING_LENGTH is the size of the character array, not the string.
229 The value returned is of type `ssizetype'.
231 Unfortunately, string_constant can't access the values of const char
232 arrays with initializers, so neither can we do so here. */
239 HOST_WIDE_INT offset;
243 src = string_constant (src, &offset_node);
247 max = TREE_STRING_LENGTH (src) - 1;
248 ptr = TREE_STRING_POINTER (src);
250 if (offset_node && TREE_CODE (offset_node) != INTEGER_CST)
252 /* If the string has an internal zero byte (e.g., "foo\0bar"), we can't
253 compute the offset to the following null if we don't know where to
254 start searching for it. */
257 for (i = 0; i < max; i++)
261 /* We don't know the starting offset, but we do know that the string
262 has no internal zero bytes. We can assume that the offset falls
263 within the bounds of the string; otherwise, the programmer deserves
264 what he gets. Subtract the offset from the length of the string,
265 and return that. This would perhaps not be valid if we were dealing
266 with named arrays in addition to literal string constants. */
268 return size_diffop (size_int (max), offset_node);
271 /* We have a known offset into the string. Start searching there for
272 a null character if we can represent it as a single HOST_WIDE_INT. */
273 if (offset_node == 0)
275 else if (! host_integerp (offset_node, 0))
278 offset = tree_low_cst (offset_node, 0);
280 /* If the offset is known to be out of bounds, warn, and call strlen at
282 if (offset < 0 || offset > max)
284 warning ("offset outside bounds of constant string");
288 /* Use strlen to search for the first zero byte. Since any strings
289 constructed with build_string will have nulls appended, we win even
290 if we get handed something like (char[4])"abcd".
292 Since OFFSET is our starting index into the string, no further
293 calculation is needed. */
294 return ssize_int (strlen (ptr + offset));
297 /* Return a char pointer for a C string if it is a string constant
298 or sum of string constant and integer constant. */
306 src = string_constant (src, &offset_node);
310 if (offset_node == 0)
311 return TREE_STRING_POINTER (src);
312 else if (!host_integerp (offset_node, 1)
313 || compare_tree_int (offset_node, TREE_STRING_LENGTH (src) - 1) > 0)
316 return TREE_STRING_POINTER (src) + tree_low_cst (offset_node, 1);
319 /* Return a CONST_INT or CONST_DOUBLE corresponding to target reading
320 GET_MODE_BITSIZE (MODE) bits from string constant STR. */
323 c_readstr (str, mode)
325 enum machine_mode mode;
331 if (GET_MODE_CLASS (mode) != MODE_INT)
336 for (i = 0; i < GET_MODE_SIZE (mode); i++)
339 if (WORDS_BIG_ENDIAN)
340 j = GET_MODE_SIZE (mode) - i - 1;
341 if (BYTES_BIG_ENDIAN != WORDS_BIG_ENDIAN
342 && GET_MODE_SIZE (mode) > UNITS_PER_WORD)
343 j = j + UNITS_PER_WORD - 2 * (j % UNITS_PER_WORD) - 1;
345 if (j > 2 * HOST_BITS_PER_WIDE_INT)
348 ch = (unsigned char) str[i];
349 c[j / HOST_BITS_PER_WIDE_INT] |= ch << (j % HOST_BITS_PER_WIDE_INT);
351 return immed_double_const (c[0], c[1], mode);
354 /* Cast a target constant CST to target CHAR and if that value fits into
355 host char type, return zero and put that value into variable pointed by
359 target_char_cast (cst, p)
363 unsigned HOST_WIDE_INT val, hostval;
365 if (!host_integerp (cst, 1)
366 || CHAR_TYPE_SIZE > HOST_BITS_PER_WIDE_INT)
369 val = tree_low_cst (cst, 1);
370 if (CHAR_TYPE_SIZE < HOST_BITS_PER_WIDE_INT)
371 val &= (((unsigned HOST_WIDE_INT) 1) << CHAR_TYPE_SIZE) - 1;
374 if (HOST_BITS_PER_CHAR < HOST_BITS_PER_WIDE_INT)
375 hostval &= (((unsigned HOST_WIDE_INT) 1) << HOST_BITS_PER_CHAR) - 1;
384 /* Given TEM, a pointer to a stack frame, follow the dynamic chain COUNT
385 times to get the address of either a higher stack frame, or a return
386 address located within it (depending on FNDECL_CODE). */
389 expand_builtin_return_addr (fndecl_code, count, tem)
390 enum built_in_function fndecl_code;
396 /* Some machines need special handling before we can access
397 arbitrary frames. For example, on the sparc, we must first flush
398 all register windows to the stack. */
399 #ifdef SETUP_FRAME_ADDRESSES
401 SETUP_FRAME_ADDRESSES ();
404 /* On the sparc, the return address is not in the frame, it is in a
405 register. There is no way to access it off of the current frame
406 pointer, but it can be accessed off the previous frame pointer by
407 reading the value from the register window save area. */
408 #ifdef RETURN_ADDR_IN_PREVIOUS_FRAME
409 if (fndecl_code == BUILT_IN_RETURN_ADDRESS)
413 /* Scan back COUNT frames to the specified frame. */
414 for (i = 0; i < count; i++)
416 /* Assume the dynamic chain pointer is in the word that the
417 frame address points to, unless otherwise specified. */
418 #ifdef DYNAMIC_CHAIN_ADDRESS
419 tem = DYNAMIC_CHAIN_ADDRESS (tem);
421 tem = memory_address (Pmode, tem);
422 tem = gen_rtx_MEM (Pmode, tem);
423 set_mem_alias_set (tem, get_frame_alias_set ());
424 tem = copy_to_reg (tem);
427 /* For __builtin_frame_address, return what we've got. */
428 if (fndecl_code == BUILT_IN_FRAME_ADDRESS)
431 /* For __builtin_return_address, Get the return address from that
433 #ifdef RETURN_ADDR_RTX
434 tem = RETURN_ADDR_RTX (count, tem);
436 tem = memory_address (Pmode,
437 plus_constant (tem, GET_MODE_SIZE (Pmode)));
438 tem = gen_rtx_MEM (Pmode, tem);
439 set_mem_alias_set (tem, get_frame_alias_set ());
444 /* Alias set used for setjmp buffer. */
445 static HOST_WIDE_INT setjmp_alias_set = -1;
447 /* Construct the leading half of a __builtin_setjmp call. Control will
448 return to RECEIVER_LABEL. This is used directly by sjlj exception
452 expand_builtin_setjmp_setup (buf_addr, receiver_label)
456 enum machine_mode sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL);
460 if (setjmp_alias_set == -1)
461 setjmp_alias_set = new_alias_set ();
463 #ifdef POINTERS_EXTEND_UNSIGNED
464 if (GET_MODE (buf_addr) != Pmode)
465 buf_addr = convert_memory_address (Pmode, buf_addr);
468 buf_addr = force_reg (Pmode, force_operand (buf_addr, NULL_RTX));
472 /* We store the frame pointer and the address of receiver_label in
473 the buffer and use the rest of it for the stack save area, which
474 is machine-dependent. */
476 #ifndef BUILTIN_SETJMP_FRAME_VALUE
477 #define BUILTIN_SETJMP_FRAME_VALUE virtual_stack_vars_rtx
480 mem = gen_rtx_MEM (Pmode, buf_addr);
481 set_mem_alias_set (mem, setjmp_alias_set);
482 emit_move_insn (mem, BUILTIN_SETJMP_FRAME_VALUE);
484 mem = gen_rtx_MEM (Pmode, plus_constant (buf_addr, GET_MODE_SIZE (Pmode))),
485 set_mem_alias_set (mem, setjmp_alias_set);
487 emit_move_insn (validize_mem (mem),
488 force_reg (Pmode, gen_rtx_LABEL_REF (Pmode, receiver_label)));
490 stack_save = gen_rtx_MEM (sa_mode,
491 plus_constant (buf_addr,
492 2 * GET_MODE_SIZE (Pmode)));
493 set_mem_alias_set (stack_save, setjmp_alias_set);
494 emit_stack_save (SAVE_NONLOCAL, &stack_save, NULL_RTX);
496 /* If there is further processing to do, do it. */
497 #ifdef HAVE_builtin_setjmp_setup
498 if (HAVE_builtin_setjmp_setup)
499 emit_insn (gen_builtin_setjmp_setup (buf_addr));
502 /* Tell optimize_save_area_alloca that extra work is going to
503 need to go on during alloca. */
504 current_function_calls_setjmp = 1;
506 /* Set this so all the registers get saved in our frame; we need to be
507 able to copy the saved values for any registers from frames we unwind. */
508 current_function_has_nonlocal_label = 1;
511 /* Construct the trailing part of a __builtin_setjmp call.
512 This is used directly by sjlj exception handling code. */
515 expand_builtin_setjmp_receiver (receiver_label)
516 rtx receiver_label ATTRIBUTE_UNUSED;
518 /* Clobber the FP when we get here, so we have to make sure it's
519 marked as used by this function. */
520 emit_insn (gen_rtx_USE (VOIDmode, hard_frame_pointer_rtx));
522 /* Mark the static chain as clobbered here so life information
523 doesn't get messed up for it. */
524 emit_insn (gen_rtx_CLOBBER (VOIDmode, static_chain_rtx));
526 /* Now put in the code to restore the frame pointer, and argument
527 pointer, if needed. The code below is from expand_end_bindings
528 in stmt.c; see detailed documentation there. */
529 #ifdef HAVE_nonlocal_goto
530 if (! HAVE_nonlocal_goto)
532 emit_move_insn (virtual_stack_vars_rtx, hard_frame_pointer_rtx);
534 #if ARG_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM
535 if (fixed_regs[ARG_POINTER_REGNUM])
537 #ifdef ELIMINABLE_REGS
539 static const struct elims {const int from, to;} elim_regs[] = ELIMINABLE_REGS;
541 for (i = 0; i < ARRAY_SIZE (elim_regs); i++)
542 if (elim_regs[i].from == ARG_POINTER_REGNUM
543 && elim_regs[i].to == HARD_FRAME_POINTER_REGNUM)
546 if (i == ARRAY_SIZE (elim_regs))
549 /* Now restore our arg pointer from the address at which it
550 was saved in our stack frame. */
551 emit_move_insn (virtual_incoming_args_rtx,
552 copy_to_reg (get_arg_pointer_save_area (cfun)));
557 #ifdef HAVE_builtin_setjmp_receiver
558 if (HAVE_builtin_setjmp_receiver)
559 emit_insn (gen_builtin_setjmp_receiver (receiver_label));
562 #ifdef HAVE_nonlocal_goto_receiver
563 if (HAVE_nonlocal_goto_receiver)
564 emit_insn (gen_nonlocal_goto_receiver ());
569 /* @@@ This is a kludge. Not all machine descriptions define a blockage
570 insn, but we must not allow the code we just generated to be reordered
571 by scheduling. Specifically, the update of the frame pointer must
572 happen immediately, not later. So emit an ASM_INPUT to act as blockage
574 emit_insn (gen_rtx_ASM_INPUT (VOIDmode, ""));
577 /* __builtin_setjmp is passed a pointer to an array of five words (not
578 all will be used on all machines). It operates similarly to the C
579 library function of the same name, but is more efficient. Much of
580 the code below (and for longjmp) is copied from the handling of
583 NOTE: This is intended for use by GNAT and the exception handling
584 scheme in the compiler and will only work in the method used by
588 expand_builtin_setjmp (arglist, target)
592 rtx buf_addr, next_lab, cont_lab;
594 if (!validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
597 if (target == 0 || GET_CODE (target) != REG
598 || REGNO (target) < FIRST_PSEUDO_REGISTER)
599 target = gen_reg_rtx (TYPE_MODE (integer_type_node));
601 buf_addr = expand_expr (TREE_VALUE (arglist), NULL_RTX, VOIDmode, 0);
603 next_lab = gen_label_rtx ();
604 cont_lab = gen_label_rtx ();
606 expand_builtin_setjmp_setup (buf_addr, next_lab);
608 /* Set TARGET to zero and branch to the continue label. */
609 emit_move_insn (target, const0_rtx);
610 emit_jump_insn (gen_jump (cont_lab));
612 emit_label (next_lab);
614 expand_builtin_setjmp_receiver (next_lab);
616 /* Set TARGET to one. */
617 emit_move_insn (target, const1_rtx);
618 emit_label (cont_lab);
620 /* Tell flow about the strange goings on. Putting `next_lab' on
621 `nonlocal_goto_handler_labels' to indicates that function
622 calls may traverse the arc back to this label. */
624 current_function_has_nonlocal_label = 1;
625 nonlocal_goto_handler_labels
626 = gen_rtx_EXPR_LIST (VOIDmode, next_lab, nonlocal_goto_handler_labels);
631 /* __builtin_longjmp is passed a pointer to an array of five words (not
632 all will be used on all machines). It operates similarly to the C
633 library function of the same name, but is more efficient. Much of
634 the code below is copied from the handling of non-local gotos.
636 NOTE: This is intended for use by GNAT and the exception handling
637 scheme in the compiler and will only work in the method used by
641 expand_builtin_longjmp (buf_addr, value)
644 rtx fp, lab, stack, insn;
645 enum machine_mode sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL);
647 if (setjmp_alias_set == -1)
648 setjmp_alias_set = new_alias_set ();
650 #ifdef POINTERS_EXTEND_UNSIGNED
651 if (GET_MODE (buf_addr) != Pmode)
652 buf_addr = convert_memory_address (Pmode, buf_addr);
655 buf_addr = force_reg (Pmode, buf_addr);
657 /* We used to store value in static_chain_rtx, but that fails if pointers
658 are smaller than integers. We instead require that the user must pass
659 a second argument of 1, because that is what builtin_setjmp will
660 return. This also makes EH slightly more efficient, since we are no
661 longer copying around a value that we don't care about. */
662 if (value != const1_rtx)
665 current_function_calls_longjmp = 1;
667 #ifdef HAVE_builtin_longjmp
668 if (HAVE_builtin_longjmp)
669 emit_insn (gen_builtin_longjmp (buf_addr));
673 fp = gen_rtx_MEM (Pmode, buf_addr);
674 lab = gen_rtx_MEM (Pmode, plus_constant (buf_addr,
675 GET_MODE_SIZE (Pmode)));
677 stack = gen_rtx_MEM (sa_mode, plus_constant (buf_addr,
678 2 * GET_MODE_SIZE (Pmode)));
679 set_mem_alias_set (fp, setjmp_alias_set);
680 set_mem_alias_set (lab, setjmp_alias_set);
681 set_mem_alias_set (stack, setjmp_alias_set);
683 /* Pick up FP, label, and SP from the block and jump. This code is
684 from expand_goto in stmt.c; see there for detailed comments. */
685 #if HAVE_nonlocal_goto
686 if (HAVE_nonlocal_goto)
687 /* We have to pass a value to the nonlocal_goto pattern that will
688 get copied into the static_chain pointer, but it does not matter
689 what that value is, because builtin_setjmp does not use it. */
690 emit_insn (gen_nonlocal_goto (value, lab, stack, fp));
694 lab = copy_to_reg (lab);
696 emit_move_insn (hard_frame_pointer_rtx, fp);
697 emit_stack_restore (SAVE_NONLOCAL, stack, NULL_RTX);
699 emit_insn (gen_rtx_USE (VOIDmode, hard_frame_pointer_rtx));
700 emit_insn (gen_rtx_USE (VOIDmode, stack_pointer_rtx));
701 emit_indirect_jump (lab);
705 /* Search backwards and mark the jump insn as a non-local goto.
706 Note that this precludes the use of __builtin_longjmp to a
707 __builtin_setjmp target in the same function. However, we've
708 already cautioned the user that these functions are for
709 internal exception handling use only. */
710 for (insn = get_last_insn (); insn; insn = PREV_INSN (insn))
712 if (GET_CODE (insn) == JUMP_INSN)
714 REG_NOTES (insn) = alloc_EXPR_LIST (REG_NON_LOCAL_GOTO, const0_rtx,
718 else if (GET_CODE (insn) == CALL_INSN)
723 /* Expand a call to __builtin_prefetch. For a target that does not support
724 data prefetch, evaluate the memory address argument in case it has side
728 expand_builtin_prefetch (arglist)
731 tree arg0, arg1, arg2;
734 if (!validate_arglist (arglist, POINTER_TYPE, 0))
737 arg0 = TREE_VALUE (arglist);
738 /* Arguments 1 and 2 are optional; argument 1 (read/write) defaults to
739 zero (read) and argument 2 (locality) defaults to 3 (high degree of
741 if (TREE_CHAIN (arglist))
743 arg1 = TREE_VALUE (TREE_CHAIN (arglist));
744 if (TREE_CHAIN (TREE_CHAIN (arglist)))
745 arg2 = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
747 arg2 = build_int_2 (3, 0);
751 arg1 = integer_zero_node;
752 arg2 = build_int_2 (3, 0);
755 /* Argument 0 is an address. */
756 op0 = expand_expr (arg0, NULL_RTX, Pmode, EXPAND_NORMAL);
758 /* Argument 1 (read/write flag) must be a compile-time constant int. */
759 if (TREE_CODE (arg1) != INTEGER_CST)
761 error ("second arg to `__builtin_prefetch' must be a constant");
762 arg1 = integer_zero_node;
764 op1 = expand_expr (arg1, NULL_RTX, VOIDmode, 0);
765 /* Argument 1 must be either zero or one. */
766 if (INTVAL (op1) != 0 && INTVAL (op1) != 1)
768 warning ("invalid second arg to __builtin_prefetch; using zero");
772 /* Argument 2 (locality) must be a compile-time constant int. */
773 if (TREE_CODE (arg2) != INTEGER_CST)
775 error ("third arg to `__builtin_prefetch' must be a constant");
776 arg2 = integer_zero_node;
778 op2 = expand_expr (arg2, NULL_RTX, VOIDmode, 0);
779 /* Argument 2 must be 0, 1, 2, or 3. */
780 if (INTVAL (op2) < 0 || INTVAL (op2) > 3)
782 warning ("invalid third arg to __builtin_prefetch; using zero");
789 if (! (*insn_data[(int)CODE_FOR_prefetch].operand[0].predicate)
791 insn_data[(int)CODE_FOR_prefetch].operand[0].mode))
792 op0 = force_reg (Pmode, op0);
793 emit_insn (gen_prefetch (op0, op1, op2));
797 op0 = protect_from_queue (op0, 0);
798 /* Don't do anything with direct references to volatile memory, but
799 generate code to handle other side effects. */
800 if (GET_CODE (op0) != MEM && side_effects_p (op0))
804 /* Get a MEM rtx for expression EXP which is the address of an operand
805 to be used to be used in a string instruction (cmpstrsi, movstrsi, ..). */
811 rtx addr = expand_expr (exp, NULL_RTX, ptr_mode, EXPAND_SUM);
814 #ifdef POINTERS_EXTEND_UNSIGNED
815 if (GET_MODE (addr) != Pmode)
816 addr = convert_memory_address (Pmode, addr);
819 mem = gen_rtx_MEM (BLKmode, memory_address (BLKmode, addr));
821 /* Get an expression we can use to find the attributes to assign to MEM.
822 If it is an ADDR_EXPR, use the operand. Otherwise, dereference it if
823 we can. First remove any nops. */
824 while ((TREE_CODE (exp) == NOP_EXPR || TREE_CODE (exp) == CONVERT_EXPR
825 || TREE_CODE (exp) == NON_LVALUE_EXPR)
826 && POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (exp, 0))))
827 exp = TREE_OPERAND (exp, 0);
829 if (TREE_CODE (exp) == ADDR_EXPR)
831 exp = TREE_OPERAND (exp, 0);
832 set_mem_attributes (mem, exp, 0);
834 else if (POINTER_TYPE_P (TREE_TYPE (exp)))
836 exp = build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (exp)), exp);
837 /* memcpy, memset and other builtin stringops can alias with anything. */
838 set_mem_alias_set (mem, 0);
844 /* Built-in functions to perform an untyped call and return. */
846 /* For each register that may be used for calling a function, this
847 gives a mode used to copy the register's value. VOIDmode indicates
848 the register is not used for calling a function. If the machine
849 has register windows, this gives only the outbound registers.
850 INCOMING_REGNO gives the corresponding inbound register. */
851 static enum machine_mode apply_args_mode[FIRST_PSEUDO_REGISTER];
853 /* For each register that may be used for returning values, this gives
854 a mode used to copy the register's value. VOIDmode indicates the
855 register is not used for returning values. If the machine has
856 register windows, this gives only the outbound registers.
857 INCOMING_REGNO gives the corresponding inbound register. */
858 static enum machine_mode apply_result_mode[FIRST_PSEUDO_REGISTER];
860 /* For each register that may be used for calling a function, this
861 gives the offset of that register into the block returned by
862 __builtin_apply_args. 0 indicates that the register is not
863 used for calling a function. */
864 static int apply_args_reg_offset[FIRST_PSEUDO_REGISTER];
866 /* Return the offset of register REGNO into the block returned by
867 __builtin_apply_args. This is not declared static, since it is
868 needed in objc-act.c. */
871 apply_args_register_offset (regno)
876 /* Arguments are always put in outgoing registers (in the argument
877 block) if such make sense. */
878 #ifdef OUTGOING_REGNO
879 regno = OUTGOING_REGNO(regno);
881 return apply_args_reg_offset[regno];
884 /* Return the size required for the block returned by __builtin_apply_args,
885 and initialize apply_args_mode. */
890 static int size = -1;
893 enum machine_mode mode;
895 /* The values computed by this function never change. */
898 /* The first value is the incoming arg-pointer. */
899 size = GET_MODE_SIZE (Pmode);
901 /* The second value is the structure value address unless this is
902 passed as an "invisible" first argument. */
903 if (struct_value_rtx)
904 size += GET_MODE_SIZE (Pmode);
906 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
907 if (FUNCTION_ARG_REGNO_P (regno))
909 /* Search for the proper mode for copying this register's
910 value. I'm not sure this is right, but it works so far. */
911 enum machine_mode best_mode = VOIDmode;
913 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
915 mode = GET_MODE_WIDER_MODE (mode))
916 if (HARD_REGNO_MODE_OK (regno, mode)
917 && HARD_REGNO_NREGS (regno, mode) == 1)
920 if (best_mode == VOIDmode)
921 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
923 mode = GET_MODE_WIDER_MODE (mode))
924 if (HARD_REGNO_MODE_OK (regno, mode)
925 && have_insn_for (SET, mode))
928 if (best_mode == VOIDmode)
929 for (mode = GET_CLASS_NARROWEST_MODE (MODE_VECTOR_FLOAT);
931 mode = GET_MODE_WIDER_MODE (mode))
932 if (HARD_REGNO_MODE_OK (regno, mode)
933 && have_insn_for (SET, mode))
936 if (best_mode == VOIDmode)
937 for (mode = GET_CLASS_NARROWEST_MODE (MODE_VECTOR_INT);
939 mode = GET_MODE_WIDER_MODE (mode))
940 if (HARD_REGNO_MODE_OK (regno, mode)
941 && have_insn_for (SET, mode))
945 if (mode == VOIDmode)
948 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
949 if (size % align != 0)
950 size = CEIL (size, align) * align;
951 apply_args_reg_offset[regno] = size;
952 size += GET_MODE_SIZE (mode);
953 apply_args_mode[regno] = mode;
957 apply_args_mode[regno] = VOIDmode;
958 apply_args_reg_offset[regno] = 0;
964 /* Return the size required for the block returned by __builtin_apply,
965 and initialize apply_result_mode. */
970 static int size = -1;
972 enum machine_mode mode;
974 /* The values computed by this function never change. */
979 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
980 if (FUNCTION_VALUE_REGNO_P (regno))
982 /* Search for the proper mode for copying this register's
983 value. I'm not sure this is right, but it works so far. */
984 enum machine_mode best_mode = VOIDmode;
986 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
988 mode = GET_MODE_WIDER_MODE (mode))
989 if (HARD_REGNO_MODE_OK (regno, mode))
992 if (best_mode == VOIDmode)
993 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
995 mode = GET_MODE_WIDER_MODE (mode))
996 if (HARD_REGNO_MODE_OK (regno, mode)
997 && have_insn_for (SET, mode))
1000 if (best_mode == VOIDmode)
1001 for (mode = GET_CLASS_NARROWEST_MODE (MODE_VECTOR_FLOAT);
1003 mode = GET_MODE_WIDER_MODE (mode))
1004 if (HARD_REGNO_MODE_OK (regno, mode)
1005 && have_insn_for (SET, mode))
1008 if (best_mode == VOIDmode)
1009 for (mode = GET_CLASS_NARROWEST_MODE (MODE_VECTOR_INT);
1011 mode = GET_MODE_WIDER_MODE (mode))
1012 if (HARD_REGNO_MODE_OK (regno, mode)
1013 && have_insn_for (SET, mode))
1017 if (mode == VOIDmode)
1020 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
1021 if (size % align != 0)
1022 size = CEIL (size, align) * align;
1023 size += GET_MODE_SIZE (mode);
1024 apply_result_mode[regno] = mode;
1027 apply_result_mode[regno] = VOIDmode;
1029 /* Allow targets that use untyped_call and untyped_return to override
1030 the size so that machine-specific information can be stored here. */
1031 #ifdef APPLY_RESULT_SIZE
1032 size = APPLY_RESULT_SIZE;
1038 #if defined (HAVE_untyped_call) || defined (HAVE_untyped_return)
1039 /* Create a vector describing the result block RESULT. If SAVEP is true,
1040 the result block is used to save the values; otherwise it is used to
1041 restore the values. */
1044 result_vector (savep, result)
1048 int regno, size, align, nelts;
1049 enum machine_mode mode;
1051 rtx *savevec = (rtx *) alloca (FIRST_PSEUDO_REGISTER * sizeof (rtx));
1054 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1055 if ((mode = apply_result_mode[regno]) != VOIDmode)
1057 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
1058 if (size % align != 0)
1059 size = CEIL (size, align) * align;
1060 reg = gen_rtx_REG (mode, savep ? regno : INCOMING_REGNO (regno));
1061 mem = adjust_address (result, mode, size);
1062 savevec[nelts++] = (savep
1063 ? gen_rtx_SET (VOIDmode, mem, reg)
1064 : gen_rtx_SET (VOIDmode, reg, mem));
1065 size += GET_MODE_SIZE (mode);
1067 return gen_rtx_PARALLEL (VOIDmode, gen_rtvec_v (nelts, savevec));
1069 #endif /* HAVE_untyped_call or HAVE_untyped_return */
1071 /* Save the state required to perform an untyped call with the same
1072 arguments as were passed to the current function. */
1075 expand_builtin_apply_args_1 ()
1078 int size, align, regno;
1079 enum machine_mode mode;
1081 /* Create a block where the arg-pointer, structure value address,
1082 and argument registers can be saved. */
1083 registers = assign_stack_local (BLKmode, apply_args_size (), -1);
1085 /* Walk past the arg-pointer and structure value address. */
1086 size = GET_MODE_SIZE (Pmode);
1087 if (struct_value_rtx)
1088 size += GET_MODE_SIZE (Pmode);
1090 /* Save each register used in calling a function to the block. */
1091 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1092 if ((mode = apply_args_mode[regno]) != VOIDmode)
1096 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
1097 if (size % align != 0)
1098 size = CEIL (size, align) * align;
1100 tem = gen_rtx_REG (mode, INCOMING_REGNO (regno));
1102 emit_move_insn (adjust_address (registers, mode, size), tem);
1103 size += GET_MODE_SIZE (mode);
1106 /* Save the arg pointer to the block. */
1107 emit_move_insn (adjust_address (registers, Pmode, 0),
1108 copy_to_reg (virtual_incoming_args_rtx));
1109 size = GET_MODE_SIZE (Pmode);
1111 /* Save the structure value address unless this is passed as an
1112 "invisible" first argument. */
1113 if (struct_value_incoming_rtx)
1115 emit_move_insn (adjust_address (registers, Pmode, size),
1116 copy_to_reg (struct_value_incoming_rtx));
1117 size += GET_MODE_SIZE (Pmode);
1120 /* Return the address of the block. */
1121 return copy_addr_to_reg (XEXP (registers, 0));
1124 /* __builtin_apply_args returns block of memory allocated on
1125 the stack into which is stored the arg pointer, structure
1126 value address, static chain, and all the registers that might
1127 possibly be used in performing a function call. The code is
1128 moved to the start of the function so the incoming values are
1132 expand_builtin_apply_args ()
1134 /* Don't do __builtin_apply_args more than once in a function.
1135 Save the result of the first call and reuse it. */
1136 if (apply_args_value != 0)
1137 return apply_args_value;
1139 /* When this function is called, it means that registers must be
1140 saved on entry to this function. So we migrate the
1141 call to the first insn of this function. */
1146 temp = expand_builtin_apply_args_1 ();
1150 apply_args_value = temp;
1152 /* Put the sequence after the NOTE that starts the function.
1153 If this is inside a SEQUENCE, make the outer-level insn
1154 chain current, so the code is placed at the start of the
1156 push_topmost_sequence ();
1157 emit_insns_before (seq, NEXT_INSN (get_insns ()));
1158 pop_topmost_sequence ();
1163 /* Perform an untyped call and save the state required to perform an
1164 untyped return of whatever value was returned by the given function. */
1167 expand_builtin_apply (function, arguments, argsize)
1168 rtx function, arguments, argsize;
1170 int size, align, regno;
1171 enum machine_mode mode;
1172 rtx incoming_args, result, reg, dest, src, call_insn;
1173 rtx old_stack_level = 0;
1174 rtx call_fusage = 0;
1176 #ifdef POINTERS_EXTEND_UNSIGNED
1177 if (GET_MODE (arguments) != Pmode)
1178 arguments = convert_memory_address (Pmode, arguments);
1181 /* Create a block where the return registers can be saved. */
1182 result = assign_stack_local (BLKmode, apply_result_size (), -1);
1184 /* Fetch the arg pointer from the ARGUMENTS block. */
1185 incoming_args = gen_reg_rtx (Pmode);
1186 emit_move_insn (incoming_args, gen_rtx_MEM (Pmode, arguments));
1187 #ifndef STACK_GROWS_DOWNWARD
1188 incoming_args = expand_simple_binop (Pmode, MINUS, incoming_args, argsize,
1189 incoming_args, 0, OPTAB_LIB_WIDEN);
1192 /* Perform postincrements before actually calling the function. */
1195 /* Push a new argument block and copy the arguments. Do not allow
1196 the (potential) memcpy call below to interfere with our stack
1198 do_pending_stack_adjust ();
1201 /* Save the stack with nonlocal if available */
1202 #ifdef HAVE_save_stack_nonlocal
1203 if (HAVE_save_stack_nonlocal)
1204 emit_stack_save (SAVE_NONLOCAL, &old_stack_level, NULL_RTX);
1207 emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX);
1209 /* Push a block of memory onto the stack to store the memory arguments.
1210 Save the address in a register, and copy the memory arguments. ??? I
1211 haven't figured out how the calling convention macros effect this,
1212 but it's likely that the source and/or destination addresses in
1213 the block copy will need updating in machine specific ways. */
1214 dest = allocate_dynamic_stack_space (argsize, 0, BITS_PER_UNIT);
1215 dest = gen_rtx_MEM (BLKmode, dest);
1216 set_mem_align (dest, PARM_BOUNDARY);
1217 src = gen_rtx_MEM (BLKmode, incoming_args);
1218 set_mem_align (src, PARM_BOUNDARY);
1219 emit_block_move (dest, src, argsize);
1221 /* Refer to the argument block. */
1223 arguments = gen_rtx_MEM (BLKmode, arguments);
1224 set_mem_align (arguments, PARM_BOUNDARY);
1226 /* Walk past the arg-pointer and structure value address. */
1227 size = GET_MODE_SIZE (Pmode);
1228 if (struct_value_rtx)
1229 size += GET_MODE_SIZE (Pmode);
1231 /* Restore each of the registers previously saved. Make USE insns
1232 for each of these registers for use in making the call. */
1233 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1234 if ((mode = apply_args_mode[regno]) != VOIDmode)
1236 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
1237 if (size % align != 0)
1238 size = CEIL (size, align) * align;
1239 reg = gen_rtx_REG (mode, regno);
1240 emit_move_insn (reg, adjust_address (arguments, mode, size));
1241 use_reg (&call_fusage, reg);
1242 size += GET_MODE_SIZE (mode);
1245 /* Restore the structure value address unless this is passed as an
1246 "invisible" first argument. */
1247 size = GET_MODE_SIZE (Pmode);
1248 if (struct_value_rtx)
1250 rtx value = gen_reg_rtx (Pmode);
1251 emit_move_insn (value, adjust_address (arguments, Pmode, size));
1252 emit_move_insn (struct_value_rtx, value);
1253 if (GET_CODE (struct_value_rtx) == REG)
1254 use_reg (&call_fusage, struct_value_rtx);
1255 size += GET_MODE_SIZE (Pmode);
1258 /* All arguments and registers used for the call are set up by now! */
1259 function = prepare_call_address (function, NULL_TREE, &call_fusage, 0, 0);
1261 /* Ensure address is valid. SYMBOL_REF is already valid, so no need,
1262 and we don't want to load it into a register as an optimization,
1263 because prepare_call_address already did it if it should be done. */
1264 if (GET_CODE (function) != SYMBOL_REF)
1265 function = memory_address (FUNCTION_MODE, function);
1267 /* Generate the actual call instruction and save the return value. */
1268 #ifdef HAVE_untyped_call
1269 if (HAVE_untyped_call)
1270 emit_call_insn (gen_untyped_call (gen_rtx_MEM (FUNCTION_MODE, function),
1271 result, result_vector (1, result)));
1274 #ifdef HAVE_call_value
1275 if (HAVE_call_value)
1279 /* Locate the unique return register. It is not possible to
1280 express a call that sets more than one return register using
1281 call_value; use untyped_call for that. In fact, untyped_call
1282 only needs to save the return registers in the given block. */
1283 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1284 if ((mode = apply_result_mode[regno]) != VOIDmode)
1287 abort (); /* HAVE_untyped_call required. */
1288 valreg = gen_rtx_REG (mode, regno);
1291 emit_call_insn (GEN_CALL_VALUE (valreg,
1292 gen_rtx_MEM (FUNCTION_MODE, function),
1293 const0_rtx, NULL_RTX, const0_rtx));
1295 emit_move_insn (adjust_address (result, GET_MODE (valreg), 0), valreg);
1301 /* Find the CALL insn we just emitted. */
1302 for (call_insn = get_last_insn ();
1303 call_insn && GET_CODE (call_insn) != CALL_INSN;
1304 call_insn = PREV_INSN (call_insn))
1310 /* Put the register usage information on the CALL. If there is already
1311 some usage information, put ours at the end. */
1312 if (CALL_INSN_FUNCTION_USAGE (call_insn))
1316 for (link = CALL_INSN_FUNCTION_USAGE (call_insn); XEXP (link, 1) != 0;
1317 link = XEXP (link, 1))
1320 XEXP (link, 1) = call_fusage;
1323 CALL_INSN_FUNCTION_USAGE (call_insn) = call_fusage;
1325 /* Restore the stack. */
1326 #ifdef HAVE_save_stack_nonlocal
1327 if (HAVE_save_stack_nonlocal)
1328 emit_stack_restore (SAVE_NONLOCAL, old_stack_level, NULL_RTX);
1331 emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX);
1335 /* Return the address of the result block. */
1336 return copy_addr_to_reg (XEXP (result, 0));
1339 /* Perform an untyped return. */
1342 expand_builtin_return (result)
1345 int size, align, regno;
1346 enum machine_mode mode;
1348 rtx call_fusage = 0;
1350 #ifdef POINTERS_EXTEND_UNSIGNED
1351 if (GET_MODE (result) != Pmode)
1352 result = convert_memory_address (Pmode, result);
1355 apply_result_size ();
1356 result = gen_rtx_MEM (BLKmode, result);
1358 #ifdef HAVE_untyped_return
1359 if (HAVE_untyped_return)
1361 emit_jump_insn (gen_untyped_return (result, result_vector (0, result)));
1367 /* Restore the return value and note that each value is used. */
1369 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1370 if ((mode = apply_result_mode[regno]) != VOIDmode)
1372 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
1373 if (size % align != 0)
1374 size = CEIL (size, align) * align;
1375 reg = gen_rtx_REG (mode, INCOMING_REGNO (regno));
1376 emit_move_insn (reg, adjust_address (result, mode, size));
1378 push_to_sequence (call_fusage);
1379 emit_insn (gen_rtx_USE (VOIDmode, reg));
1380 call_fusage = get_insns ();
1382 size += GET_MODE_SIZE (mode);
1385 /* Put the USE insns before the return. */
1386 emit_insns (call_fusage);
1388 /* Return whatever values was restored by jumping directly to the end
1390 expand_null_return ();
1393 /* Used by expand_builtin_classify_type and fold_builtin_classify_type. */
1395 static enum type_class
1396 type_to_class (type)
1399 switch (TREE_CODE (type))
1401 case VOID_TYPE: return void_type_class;
1402 case INTEGER_TYPE: return integer_type_class;
1403 case CHAR_TYPE: return char_type_class;
1404 case ENUMERAL_TYPE: return enumeral_type_class;
1405 case BOOLEAN_TYPE: return boolean_type_class;
1406 case POINTER_TYPE: return pointer_type_class;
1407 case REFERENCE_TYPE: return reference_type_class;
1408 case OFFSET_TYPE: return offset_type_class;
1409 case REAL_TYPE: return real_type_class;
1410 case COMPLEX_TYPE: return complex_type_class;
1411 case FUNCTION_TYPE: return function_type_class;
1412 case METHOD_TYPE: return method_type_class;
1413 case RECORD_TYPE: return record_type_class;
1415 case QUAL_UNION_TYPE: return union_type_class;
1416 case ARRAY_TYPE: return (TYPE_STRING_FLAG (type)
1417 ? string_type_class : array_type_class);
1418 case SET_TYPE: return set_type_class;
1419 case FILE_TYPE: return file_type_class;
1420 case LANG_TYPE: return lang_type_class;
1421 default: return no_type_class;
1425 /* Expand a call to __builtin_classify_type with arguments found in
1429 expand_builtin_classify_type (arglist)
1433 return GEN_INT (type_to_class (TREE_TYPE (TREE_VALUE (arglist))));
1434 return GEN_INT (no_type_class);
1437 /* Expand expression EXP, which is a call to __builtin_constant_p. */
1440 expand_builtin_constant_p (exp)
1443 tree arglist = TREE_OPERAND (exp, 1);
1444 enum machine_mode value_mode = TYPE_MODE (TREE_TYPE (exp));
1449 arglist = TREE_VALUE (arglist);
1451 /* We have taken care of the easy cases during constant folding. This
1452 case is not obvious, so emit (constant_p_rtx (ARGLIST)) and let CSE get a
1453 chance to see if it can deduce whether ARGLIST is constant. */
1455 tmp = expand_expr (arglist, NULL_RTX, VOIDmode, 0);
1456 tmp = gen_rtx_CONSTANT_P_RTX (value_mode, tmp);
1460 /* Expand a call to one of the builtin math functions (sin, cos, or sqrt).
1461 Return 0 if a normal call should be emitted rather than expanding the
1462 function in-line. EXP is the expression that is a call to the builtin
1463 function; if convenient, the result should be placed in TARGET.
1464 SUBTARGET may be used as the target for computing one of EXP's operands. */
1467 expand_builtin_mathfn (exp, target, subtarget)
1469 rtx target, subtarget;
1471 optab builtin_optab;
1473 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
1474 tree arglist = TREE_OPERAND (exp, 1);
1476 if (!validate_arglist (arglist, REAL_TYPE, VOID_TYPE))
1479 /* Stabilize and compute the argument. */
1480 if (TREE_CODE (TREE_VALUE (arglist)) != VAR_DECL
1481 && TREE_CODE (TREE_VALUE (arglist)) != PARM_DECL)
1483 exp = copy_node (exp);
1484 TREE_OPERAND (exp, 1) = arglist;
1485 /* Wrap the computation of the argument in a SAVE_EXPR. That
1486 way, if we need to expand the argument again (as in the
1487 flag_errno_math case below where we cannot directly set
1488 errno), we will not perform side-effects more than once.
1489 Note that here we're mutating the original EXP as well as the
1490 copy; that's the right thing to do in case the original EXP
1491 is expanded later. */
1492 TREE_VALUE (arglist) = save_expr (TREE_VALUE (arglist));
1493 arglist = copy_node (arglist);
1495 op0 = expand_expr (TREE_VALUE (arglist), subtarget, VOIDmode, 0);
1497 /* Make a suitable register to place result in. */
1498 target = gen_reg_rtx (TYPE_MODE (TREE_TYPE (exp)));
1503 switch (DECL_FUNCTION_CODE (fndecl))
1508 builtin_optab = sin_optab; break;
1512 builtin_optab = cos_optab; break;
1514 case BUILT_IN_SQRTF:
1515 case BUILT_IN_SQRTL:
1516 builtin_optab = sqrt_optab; break;
1521 /* Compute into TARGET.
1522 Set TARGET to wherever the result comes back. */
1523 target = expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist))),
1524 builtin_optab, op0, target, 0);
1526 /* If we were unable to expand via the builtin, stop the
1527 sequence (without outputting the insns) and return 0, causing
1528 a call to the library function. */
1535 /* If errno must be maintained and if we are not allowing unsafe
1536 math optimizations, check the result. */
1538 if (flag_errno_math && ! flag_unsafe_math_optimizations)
1542 /* Don't define the builtin FP instructions
1543 if your machine is not IEEE. */
1544 if (TARGET_FLOAT_FORMAT != IEEE_FLOAT_FORMAT)
1547 lab1 = gen_label_rtx ();
1549 /* Test the result; if it is NaN, set errno=EDOM because
1550 the argument was not in the domain. */
1551 emit_cmp_and_jump_insns (target, target, EQ, 0, GET_MODE (target),
1556 #ifdef GEN_ERRNO_RTX
1557 rtx errno_rtx = GEN_ERRNO_RTX;
1560 = gen_rtx_MEM (word_mode, gen_rtx_SYMBOL_REF (Pmode, "errno"));
1563 emit_move_insn (errno_rtx, GEN_INT (TARGET_EDOM));
1566 /* We can't set errno=EDOM directly; let the library call do it.
1567 Pop the arguments right away in case the call gets deleted. */
1569 expand_call (exp, target, 0);
1576 /* Output the entire sequence. */
1577 insns = get_insns ();
1584 /* Expand expression EXP which is a call to the strlen builtin. Return 0
1585 if we failed the caller should emit a normal call, otherwise
1586 try to get the result in TARGET, if convenient. */
1589 expand_builtin_strlen (exp, target)
1593 tree arglist = TREE_OPERAND (exp, 1);
1594 enum machine_mode value_mode = TYPE_MODE (TREE_TYPE (exp));
1596 if (!validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
1601 tree src = TREE_VALUE (arglist);
1604 = get_pointer_alignment (src, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
1606 rtx result, src_reg, char_rtx, before_strlen;
1607 enum machine_mode insn_mode = value_mode, char_mode;
1608 enum insn_code icode = CODE_FOR_nothing;
1610 /* If SRC is not a pointer type, don't do this operation inline. */
1614 /* Bail out if we can't compute strlen in the right mode. */
1615 while (insn_mode != VOIDmode)
1617 icode = strlen_optab->handlers[(int) insn_mode].insn_code;
1618 if (icode != CODE_FOR_nothing)
1621 insn_mode = GET_MODE_WIDER_MODE (insn_mode);
1623 if (insn_mode == VOIDmode)
1626 /* Make a place to write the result of the instruction. */
1629 && GET_CODE (result) == REG
1630 && GET_MODE (result) == insn_mode
1631 && REGNO (result) >= FIRST_PSEUDO_REGISTER))
1632 result = gen_reg_rtx (insn_mode);
1634 /* Make a place to hold the source address. We will not expand
1635 the actual source until we are sure that the expansion will
1636 not fail -- there are trees that cannot be expanded twice. */
1637 src_reg = gen_reg_rtx (Pmode);
1639 /* Mark the beginning of the strlen sequence so we can emit the
1640 source operand later. */
1641 before_strlen = get_last_insn();
1643 char_rtx = const0_rtx;
1644 char_mode = insn_data[(int) icode].operand[2].mode;
1645 if (! (*insn_data[(int) icode].operand[2].predicate) (char_rtx,
1647 char_rtx = copy_to_mode_reg (char_mode, char_rtx);
1649 pat = GEN_FCN (icode) (result, gen_rtx_MEM (BLKmode, src_reg),
1650 char_rtx, GEN_INT (align));
1655 /* Now that we are assured of success, expand the source. */
1657 pat = memory_address (BLKmode,
1658 expand_expr (src, src_reg, ptr_mode, EXPAND_SUM));
1660 emit_move_insn (src_reg, pat);
1661 pat = gen_sequence ();
1665 emit_insn_after (pat, before_strlen);
1667 emit_insn_before (pat, get_insns ());
1669 /* Return the value in the proper mode for this function. */
1670 if (GET_MODE (result) == value_mode)
1672 else if (target != 0)
1673 convert_move (target, result, 0);
1675 target = convert_to_mode (value_mode, result, 0);
1681 /* Expand a call to the strstr builtin. Return 0 if we failed the
1682 caller should emit a normal call, otherwise try to get the result
1683 in TARGET, if convenient (and in mode MODE if that's convenient). */
1686 expand_builtin_strstr (arglist, target, mode)
1689 enum machine_mode mode;
1691 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
1695 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1697 const char *p1, *p2;
1706 const char *r = strstr (p1, p2);
1711 /* Return an offset into the constant string argument. */
1712 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1713 s1, ssize_int (r - p1))),
1714 target, mode, EXPAND_NORMAL);
1718 return expand_expr (s1, target, mode, EXPAND_NORMAL);
1723 fn = built_in_decls[BUILT_IN_STRCHR];
1727 /* New argument list transforming strstr(s1, s2) to
1728 strchr(s1, s2[0]). */
1730 build_tree_list (NULL_TREE, build_int_2 (p2[0], 0));
1731 arglist = tree_cons (NULL_TREE, s1, arglist);
1732 return expand_expr (build_function_call_expr (fn, arglist),
1733 target, mode, EXPAND_NORMAL);
1737 /* Expand a call to the strchr builtin. Return 0 if we failed the
1738 caller should emit a normal call, otherwise try to get the result
1739 in TARGET, if convenient (and in mode MODE if that's convenient). */
1742 expand_builtin_strchr (arglist, target, mode)
1745 enum machine_mode mode;
1747 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
1751 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1754 if (TREE_CODE (s2) != INTEGER_CST)
1763 if (target_char_cast (s2, &c))
1771 /* Return an offset into the constant string argument. */
1772 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1773 s1, ssize_int (r - p1))),
1774 target, mode, EXPAND_NORMAL);
1777 /* FIXME: Should use here strchrM optab so that ports can optimize
1783 /* Expand a call to the strrchr builtin. Return 0 if we failed the
1784 caller should emit a normal call, otherwise try to get the result
1785 in TARGET, if convenient (and in mode MODE if that's convenient). */
1788 expand_builtin_strrchr (arglist, target, mode)
1791 enum machine_mode mode;
1793 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
1797 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1801 if (TREE_CODE (s2) != INTEGER_CST)
1810 if (target_char_cast (s2, &c))
1813 r = strrchr (p1, c);
1818 /* Return an offset into the constant string argument. */
1819 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1820 s1, ssize_int (r - p1))),
1821 target, mode, EXPAND_NORMAL);
1824 if (! integer_zerop (s2))
1827 fn = built_in_decls[BUILT_IN_STRCHR];
1831 /* Transform strrchr(s1, '\0') to strchr(s1, '\0'). */
1832 return expand_expr (build_function_call_expr (fn, arglist),
1833 target, mode, EXPAND_NORMAL);
1837 /* Expand a call to the strpbrk builtin. Return 0 if we failed the
1838 caller should emit a normal call, otherwise try to get the result
1839 in TARGET, if convenient (and in mode MODE if that's convenient). */
1842 expand_builtin_strpbrk (arglist, target, mode)
1845 enum machine_mode mode;
1847 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
1851 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1853 const char *p1, *p2;
1862 const char *r = strpbrk (p1, p2);
1867 /* Return an offset into the constant string argument. */
1868 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1869 s1, ssize_int (r - p1))),
1870 target, mode, EXPAND_NORMAL);
1875 /* strpbrk(x, "") == NULL.
1876 Evaluate and ignore the arguments in case they had
1878 expand_expr (s1, const0_rtx, VOIDmode, EXPAND_NORMAL);
1883 return 0; /* Really call strpbrk. */
1885 fn = built_in_decls[BUILT_IN_STRCHR];
1889 /* New argument list transforming strpbrk(s1, s2) to
1890 strchr(s1, s2[0]). */
1892 build_tree_list (NULL_TREE, build_int_2 (p2[0], 0));
1893 arglist = tree_cons (NULL_TREE, s1, arglist);
1894 return expand_expr (build_function_call_expr (fn, arglist),
1895 target, mode, EXPAND_NORMAL);
1899 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
1900 bytes from constant string DATA + OFFSET and return it as target
1904 builtin_memcpy_read_str (data, offset, mode)
1906 HOST_WIDE_INT offset;
1907 enum machine_mode mode;
1909 const char *str = (const char *) data;
1912 || ((unsigned HOST_WIDE_INT) offset + GET_MODE_SIZE (mode)
1913 > strlen (str) + 1))
1914 abort (); /* Attempt to read past the end of constant string. */
1916 return c_readstr (str + offset, mode);
1919 /* Expand a call to the memcpy builtin, with arguments in ARGLIST.
1920 Return 0 if we failed, the caller should emit a normal call, otherwise
1921 try to get the result in TARGET, if convenient (and in mode MODE if
1922 that's convenient). */
1925 expand_builtin_memcpy (arglist, target, mode)
1928 enum machine_mode mode;
1930 if (!validate_arglist (arglist,
1931 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
1935 tree dest = TREE_VALUE (arglist);
1936 tree src = TREE_VALUE (TREE_CHAIN (arglist));
1937 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
1938 const char *src_str;
1940 unsigned int src_align = get_pointer_alignment (src, BIGGEST_ALIGNMENT);
1941 unsigned int dest_align
1942 = get_pointer_alignment (dest, BIGGEST_ALIGNMENT);
1943 rtx dest_mem, src_mem, dest_addr, len_rtx;
1945 /* If DEST is not a pointer type, call the normal function. */
1946 if (dest_align == 0)
1949 /* If the LEN parameter is zero, return DEST. */
1950 if (host_integerp (len, 1) && tree_low_cst (len, 1) == 0)
1952 /* Evaluate and ignore SRC in case it has side-effects. */
1953 expand_expr (src, const0_rtx, VOIDmode, EXPAND_NORMAL);
1954 return expand_expr (dest, target, mode, EXPAND_NORMAL);
1957 /* If either SRC is not a pointer type, don't do this
1958 operation in-line. */
1962 dest_mem = get_memory_rtx (dest);
1963 set_mem_align (dest_mem, dest_align);
1964 len_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
1965 src_str = c_getstr (src);
1967 /* If SRC is a string constant and block move would be done
1968 by pieces, we can avoid loading the string from memory
1969 and only stored the computed constants. */
1971 && GET_CODE (len_rtx) == CONST_INT
1972 && (unsigned HOST_WIDE_INT) INTVAL (len_rtx) <= strlen (src_str) + 1
1973 && can_store_by_pieces (INTVAL (len_rtx), builtin_memcpy_read_str,
1974 (PTR) src_str, dest_align))
1976 store_by_pieces (dest_mem, INTVAL (len_rtx),
1977 builtin_memcpy_read_str,
1978 (PTR) src_str, dest_align);
1979 return force_operand (XEXP (dest_mem, 0), NULL_RTX);
1982 src_mem = get_memory_rtx (src);
1983 set_mem_align (src_mem, src_align);
1985 /* Copy word part most expediently. */
1986 dest_addr = emit_block_move (dest_mem, src_mem, len_rtx);
1989 dest_addr = force_operand (XEXP (dest_mem, 0), NULL_RTX);
1995 /* Expand expression EXP, which is a call to the strcpy builtin. Return 0
1996 if we failed the caller should emit a normal call, otherwise try to get
1997 the result in TARGET, if convenient (and in mode MODE if that's
2001 expand_builtin_strcpy (exp, target, mode)
2004 enum machine_mode mode;
2006 tree arglist = TREE_OPERAND (exp, 1);
2009 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2012 fn = built_in_decls[BUILT_IN_MEMCPY];
2016 len = c_strlen (TREE_VALUE (TREE_CHAIN (arglist)));
2020 len = size_binop (PLUS_EXPR, len, ssize_int (1));
2021 chainon (arglist, build_tree_list (NULL_TREE, len));
2022 return expand_expr (build_function_call_expr (fn, arglist),
2023 target, mode, EXPAND_NORMAL);
2026 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
2027 bytes from constant string DATA + OFFSET and return it as target
2031 builtin_strncpy_read_str (data, offset, mode)
2033 HOST_WIDE_INT offset;
2034 enum machine_mode mode;
2036 const char *str = (const char *) data;
2038 if ((unsigned HOST_WIDE_INT) offset > strlen (str))
2041 return c_readstr (str + offset, mode);
2044 /* Expand expression EXP, which is a call to the strncpy builtin. Return 0
2045 if we failed the caller should emit a normal call. */
2048 expand_builtin_strncpy (arglist, target, mode)
2051 enum machine_mode mode;
2053 if (!validate_arglist (arglist,
2054 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2058 tree slen = c_strlen (TREE_VALUE (TREE_CHAIN (arglist)));
2059 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2062 /* We must be passed a constant len parameter. */
2063 if (TREE_CODE (len) != INTEGER_CST)
2066 /* If the len parameter is zero, return the dst parameter. */
2067 if (integer_zerop (len))
2069 /* Evaluate and ignore the src argument in case it has
2071 expand_expr (TREE_VALUE (TREE_CHAIN (arglist)), const0_rtx,
2072 VOIDmode, EXPAND_NORMAL);
2073 /* Return the dst parameter. */
2074 return expand_expr (TREE_VALUE (arglist), target, mode,
2078 /* Now, we must be passed a constant src ptr parameter. */
2079 if (slen == 0 || TREE_CODE (slen) != INTEGER_CST)
2082 slen = size_binop (PLUS_EXPR, slen, ssize_int (1));
2084 /* We're required to pad with trailing zeros if the requested
2085 len is greater than strlen(s2)+1. In that case try to
2086 use store_by_pieces, if it fails, punt. */
2087 if (tree_int_cst_lt (slen, len))
2089 tree dest = TREE_VALUE (arglist);
2090 unsigned int dest_align
2091 = get_pointer_alignment (dest, BIGGEST_ALIGNMENT);
2092 const char *p = c_getstr (TREE_VALUE (TREE_CHAIN (arglist)));
2095 if (!p || dest_align == 0 || !host_integerp (len, 1)
2096 || !can_store_by_pieces (tree_low_cst (len, 1),
2097 builtin_strncpy_read_str,
2098 (PTR) p, dest_align))
2101 dest_mem = get_memory_rtx (dest);
2102 store_by_pieces (dest_mem, tree_low_cst (len, 1),
2103 builtin_strncpy_read_str,
2104 (PTR) p, dest_align);
2105 return force_operand (XEXP (dest_mem, 0), NULL_RTX);
2108 /* OK transform into builtin memcpy. */
2109 fn = built_in_decls[BUILT_IN_MEMCPY];
2112 return expand_expr (build_function_call_expr (fn, arglist),
2113 target, mode, EXPAND_NORMAL);
2117 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
2118 bytes from constant string DATA + OFFSET and return it as target
2122 builtin_memset_read_str (data, offset, mode)
2124 HOST_WIDE_INT offset ATTRIBUTE_UNUSED;
2125 enum machine_mode mode;
2127 const char *c = (const char *) data;
2128 char *p = alloca (GET_MODE_SIZE (mode));
2130 memset (p, *c, GET_MODE_SIZE (mode));
2132 return c_readstr (p, mode);
2135 /* Expand expression EXP, which is a call to the memset builtin. Return 0
2136 if we failed the caller should emit a normal call, otherwise try to get
2137 the result in TARGET, if convenient (and in mode MODE if that's
2141 expand_builtin_memset (exp, target, mode)
2144 enum machine_mode mode;
2146 tree arglist = TREE_OPERAND (exp, 1);
2148 if (!validate_arglist (arglist,
2149 POINTER_TYPE, INTEGER_TYPE, INTEGER_TYPE, VOID_TYPE))
2153 tree dest = TREE_VALUE (arglist);
2154 tree val = TREE_VALUE (TREE_CHAIN (arglist));
2155 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2158 unsigned int dest_align
2159 = get_pointer_alignment (dest, BIGGEST_ALIGNMENT);
2160 rtx dest_mem, dest_addr, len_rtx;
2162 /* If DEST is not a pointer type, don't do this
2163 operation in-line. */
2164 if (dest_align == 0)
2167 /* If the LEN parameter is zero, return DEST. */
2168 if (host_integerp (len, 1) && tree_low_cst (len, 1) == 0)
2170 /* Evaluate and ignore VAL in case it has side-effects. */
2171 expand_expr (val, const0_rtx, VOIDmode, EXPAND_NORMAL);
2172 return expand_expr (dest, target, mode, EXPAND_NORMAL);
2175 if (TREE_CODE (val) != INTEGER_CST)
2178 if (target_char_cast (val, &c))
2183 if (!host_integerp (len, 1))
2185 if (!can_store_by_pieces (tree_low_cst (len, 1),
2186 builtin_memset_read_str, (PTR) &c,
2190 dest_mem = get_memory_rtx (dest);
2191 store_by_pieces (dest_mem, tree_low_cst (len, 1),
2192 builtin_memset_read_str,
2193 (PTR) &c, dest_align);
2194 return force_operand (XEXP (dest_mem, 0), NULL_RTX);
2197 len_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
2199 dest_mem = get_memory_rtx (dest);
2200 set_mem_align (dest_mem, dest_align);
2201 dest_addr = clear_storage (dest_mem, len_rtx);
2204 dest_addr = force_operand (XEXP (dest_mem, 0), NULL_RTX);
2210 /* Expand expression EXP, which is a call to the bzero builtin. Return 0
2211 if we failed the caller should emit a normal call. */
2214 expand_builtin_bzero (exp)
2217 tree arglist = TREE_OPERAND (exp, 1);
2218 tree dest, size, newarglist;
2221 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2224 dest = TREE_VALUE (arglist);
2225 size = TREE_VALUE (TREE_CHAIN (arglist));
2227 /* New argument list transforming bzero(ptr x, int y) to
2228 memset(ptr x, int 0, size_t y). This is done this way
2229 so that if it isn't expanded inline, we fallback to
2230 calling bzero instead of memset. */
2232 newarglist = build_tree_list (NULL_TREE, convert (sizetype, size));
2233 newarglist = tree_cons (NULL_TREE, integer_zero_node, newarglist);
2234 newarglist = tree_cons (NULL_TREE, dest, newarglist);
2236 TREE_OPERAND (exp, 1) = newarglist;
2237 result = expand_builtin_memset (exp, const0_rtx, VOIDmode);
2239 /* Always restore the original arguments. */
2240 TREE_OPERAND (exp, 1) = arglist;
2245 /* Expand expression EXP, which is a call to the memcmp or the strcmp builtin.
2246 ARGLIST is the argument list for this call. Return 0 if we failed and the
2247 caller should emit a normal call, otherwise try to get the result in
2248 TARGET, if convenient (and in mode MODE, if that's convenient). */
2251 expand_builtin_memcmp (exp, arglist, target, mode)
2252 tree exp ATTRIBUTE_UNUSED;
2255 enum machine_mode mode;
2257 tree arg1, arg2, len;
2258 const char *p1, *p2;
2260 if (!validate_arglist (arglist,
2261 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2264 arg1 = TREE_VALUE (arglist);
2265 arg2 = TREE_VALUE (TREE_CHAIN (arglist));
2266 len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2268 /* If the len parameter is zero, return zero. */
2269 if (host_integerp (len, 1) && tree_low_cst (len, 1) == 0)
2271 /* Evaluate and ignore arg1 and arg2 in case they have
2273 expand_expr (arg1, const0_rtx, VOIDmode, EXPAND_NORMAL);
2274 expand_expr (arg2, const0_rtx, VOIDmode, EXPAND_NORMAL);
2278 p1 = c_getstr (arg1);
2279 p2 = c_getstr (arg2);
2281 /* If all arguments are constant, and the value of len is not greater
2282 than the lengths of arg1 and arg2, evaluate at compile-time. */
2283 if (host_integerp (len, 1) && p1 && p2
2284 && compare_tree_int (len, strlen (p1) + 1) <= 0
2285 && compare_tree_int (len, strlen (p2) + 1) <= 0)
2287 const int r = memcmp (p1, p2, tree_low_cst (len, 1));
2289 return (r < 0 ? constm1_rtx : (r > 0 ? const1_rtx : const0_rtx));
2292 /* If len parameter is one, return an expression corresponding to
2293 (*(const unsigned char*)arg1 - (const unsigned char*)arg2). */
2294 if (host_integerp (len, 1) && tree_low_cst (len, 1) == 1)
2296 tree cst_uchar_node = build_type_variant (unsigned_char_type_node, 1, 0);
2297 tree cst_uchar_ptr_node = build_pointer_type (cst_uchar_node);
2299 fold (build1 (CONVERT_EXPR, integer_type_node,
2300 build1 (INDIRECT_REF, cst_uchar_node,
2301 build1 (NOP_EXPR, cst_uchar_ptr_node, arg1))));
2303 fold (build1 (CONVERT_EXPR, integer_type_node,
2304 build1 (INDIRECT_REF, cst_uchar_node,
2305 build1 (NOP_EXPR, cst_uchar_ptr_node, arg2))));
2306 tree result = fold (build (MINUS_EXPR, integer_type_node, ind1, ind2));
2307 return expand_expr (result, target, mode, EXPAND_NORMAL);
2310 #ifdef HAVE_cmpstrsi
2312 rtx arg1_rtx, arg2_rtx, arg3_rtx;
2317 = get_pointer_alignment (arg1, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
2319 = get_pointer_alignment (arg2, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
2320 enum machine_mode insn_mode
2321 = insn_data[(int) CODE_FOR_cmpstrsi].operand[0].mode;
2323 /* If we don't have POINTER_TYPE, call the function. */
2324 if (arg1_align == 0 || arg2_align == 0)
2327 /* Make a place to write the result of the instruction. */
2330 && GET_CODE (result) == REG && GET_MODE (result) == insn_mode
2331 && REGNO (result) >= FIRST_PSEUDO_REGISTER))
2332 result = gen_reg_rtx (insn_mode);
2334 arg1_rtx = get_memory_rtx (arg1);
2335 arg2_rtx = get_memory_rtx (arg2);
2336 arg3_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
2340 insn = gen_cmpstrsi (result, arg1_rtx, arg2_rtx, arg3_rtx,
2341 GEN_INT (MIN (arg1_align, arg2_align)));
2346 emit_library_call_value (memcmp_libfunc, result, LCT_PURE_MAKE_BLOCK,
2347 TYPE_MODE (integer_type_node), 3,
2348 XEXP (arg1_rtx, 0), Pmode,
2349 XEXP (arg2_rtx, 0), Pmode,
2350 convert_to_mode (TYPE_MODE (sizetype), arg3_rtx,
2351 TREE_UNSIGNED (sizetype)),
2352 TYPE_MODE (sizetype));
2354 /* Return the value in the proper mode for this function. */
2355 mode = TYPE_MODE (TREE_TYPE (exp));
2356 if (GET_MODE (result) == mode)
2358 else if (target != 0)
2360 convert_move (target, result, 0);
2364 return convert_to_mode (mode, result, 0);
2371 /* Expand expression EXP, which is a call to the strcmp builtin. Return 0
2372 if we failed the caller should emit a normal call, otherwise try to get
2373 the result in TARGET, if convenient. */
2376 expand_builtin_strcmp (exp, target, mode)
2379 enum machine_mode mode;
2381 tree arglist = TREE_OPERAND (exp, 1);
2382 tree arg1, arg2, len, len2, fn;
2383 const char *p1, *p2;
2385 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2388 arg1 = TREE_VALUE (arglist);
2389 arg2 = TREE_VALUE (TREE_CHAIN (arglist));
2391 p1 = c_getstr (arg1);
2392 p2 = c_getstr (arg2);
2396 const int i = strcmp (p1, p2);
2397 return (i < 0 ? constm1_rtx : (i > 0 ? const1_rtx : const0_rtx));
2400 /* If either arg is "", return an expression corresponding to
2401 (*(const unsigned char*)arg1 - (const unsigned char*)arg2). */
2402 if ((p1 && *p1 == '\0') || (p2 && *p2 == '\0'))
2404 tree cst_uchar_node = build_type_variant (unsigned_char_type_node, 1, 0);
2405 tree cst_uchar_ptr_node = build_pointer_type (cst_uchar_node);
2407 fold (build1 (CONVERT_EXPR, integer_type_node,
2408 build1 (INDIRECT_REF, cst_uchar_node,
2409 build1 (NOP_EXPR, cst_uchar_ptr_node, arg1))));
2411 fold (build1 (CONVERT_EXPR, integer_type_node,
2412 build1 (INDIRECT_REF, cst_uchar_node,
2413 build1 (NOP_EXPR, cst_uchar_ptr_node, arg2))));
2414 tree result = fold (build (MINUS_EXPR, integer_type_node, ind1, ind2));
2415 return expand_expr (result, target, mode, EXPAND_NORMAL);
2418 len = c_strlen (arg1);
2419 len2 = c_strlen (arg2);
2422 len = size_binop (PLUS_EXPR, ssize_int (1), len);
2425 len2 = size_binop (PLUS_EXPR, ssize_int (1), len2);
2427 /* If we don't have a constant length for the first, use the length
2428 of the second, if we know it. We don't require a constant for
2429 this case; some cost analysis could be done if both are available
2430 but neither is constant. For now, assume they're equally cheap
2431 unless one has side effects.
2433 If both strings have constant lengths, use the smaller. This
2434 could arise if optimization results in strcpy being called with
2435 two fixed strings, or if the code was machine-generated. We should
2436 add some code to the `memcmp' handler below to deal with such
2437 situations, someday. */
2439 if (!len || TREE_CODE (len) != INTEGER_CST)
2441 if (len2 && !TREE_SIDE_EFFECTS (len2))
2446 else if (len2 && TREE_CODE (len2) == INTEGER_CST
2447 && tree_int_cst_lt (len2, len))
2450 /* If both arguments have side effects, we cannot optimize. */
2451 if (TREE_SIDE_EFFECTS (len))
2454 fn = built_in_decls[BUILT_IN_MEMCMP];
2458 chainon (arglist, build_tree_list (NULL_TREE, len));
2459 return expand_expr (build_function_call_expr (fn, arglist),
2460 target, mode, EXPAND_NORMAL);
2463 /* Expand expression EXP, which is a call to the strncmp builtin. Return 0
2464 if we failed the caller should emit a normal call, otherwise try to get
2465 the result in TARGET, if convenient. */
2468 expand_builtin_strncmp (exp, target, mode)
2471 enum machine_mode mode;
2473 tree arglist = TREE_OPERAND (exp, 1);
2474 tree fn, newarglist, len = 0;
2475 tree arg1, arg2, arg3;
2476 const char *p1, *p2;
2478 if (!validate_arglist (arglist,
2479 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2482 arg1 = TREE_VALUE (arglist);
2483 arg2 = TREE_VALUE (TREE_CHAIN (arglist));
2484 arg3 = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2486 /* If the len parameter is zero, return zero. */
2487 if (host_integerp (arg3, 1) && tree_low_cst (arg3, 1) == 0)
2489 /* Evaluate and ignore arg1 and arg2 in case they have
2491 expand_expr (arg1, const0_rtx, VOIDmode, EXPAND_NORMAL);
2492 expand_expr (arg2, const0_rtx, VOIDmode, EXPAND_NORMAL);
2496 p1 = c_getstr (arg1);
2497 p2 = c_getstr (arg2);
2499 /* If all arguments are constant, evaluate at compile-time. */
2500 if (host_integerp (arg3, 1) && p1 && p2)
2502 const int r = strncmp (p1, p2, tree_low_cst (arg3, 1));
2503 return (r < 0 ? constm1_rtx : (r > 0 ? const1_rtx : const0_rtx));
2506 /* If len == 1 or (either string parameter is "" and (len >= 1)),
2507 return (*(const u_char*)arg1 - *(const u_char*)arg2). */
2508 if (host_integerp (arg3, 1)
2509 && (tree_low_cst (arg3, 1) == 1
2510 || (tree_low_cst (arg3, 1) > 1
2511 && ((p1 && *p1 == '\0') || (p2 && *p2 == '\0')))))
2513 tree cst_uchar_node = build_type_variant (unsigned_char_type_node, 1, 0);
2514 tree cst_uchar_ptr_node = build_pointer_type (cst_uchar_node);
2516 fold (build1 (CONVERT_EXPR, integer_type_node,
2517 build1 (INDIRECT_REF, cst_uchar_node,
2518 build1 (NOP_EXPR, cst_uchar_ptr_node, arg1))));
2520 fold (build1 (CONVERT_EXPR, integer_type_node,
2521 build1 (INDIRECT_REF, cst_uchar_node,
2522 build1 (NOP_EXPR, cst_uchar_ptr_node, arg2))));
2523 tree result = fold (build (MINUS_EXPR, integer_type_node, ind1, ind2));
2524 return expand_expr (result, target, mode, EXPAND_NORMAL);
2527 /* If c_strlen can determine an expression for one of the string
2528 lengths, and it doesn't have side effects, then call
2529 expand_builtin_memcmp() using length MIN(strlen(string)+1, arg3). */
2531 /* Perhaps one of the strings is really constant, if so prefer
2532 that constant length over the other string's length. */
2534 len = c_strlen (arg1);
2536 len = c_strlen (arg2);
2538 /* If we still don't have a len, try either string arg as long
2539 as they don't have side effects. */
2540 if (!len && !TREE_SIDE_EFFECTS (arg1))
2541 len = c_strlen (arg1);
2542 if (!len && !TREE_SIDE_EFFECTS (arg2))
2543 len = c_strlen (arg2);
2544 /* If we still don't have a length, punt. */
2548 fn = built_in_decls[BUILT_IN_MEMCMP];
2552 /* Add one to the string length. */
2553 len = fold (size_binop (PLUS_EXPR, len, ssize_int (1)));
2555 /* The actual new length parameter is MIN(len,arg3). */
2556 len = fold (build (MIN_EXPR, TREE_TYPE (len), len, arg3));
2558 newarglist = build_tree_list (NULL_TREE, len);
2559 newarglist = tree_cons (NULL_TREE, arg2, newarglist);
2560 newarglist = tree_cons (NULL_TREE, arg1, newarglist);
2561 return expand_expr (build_function_call_expr (fn, newarglist),
2562 target, mode, EXPAND_NORMAL);
2565 /* Expand expression EXP, which is a call to the strcat builtin.
2566 Return 0 if we failed the caller should emit a normal call,
2567 otherwise try to get the result in TARGET, if convenient. */
2570 expand_builtin_strcat (arglist, target, mode)
2573 enum machine_mode mode;
2575 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2579 tree dst = TREE_VALUE (arglist),
2580 src = TREE_VALUE (TREE_CHAIN (arglist));
2581 const char *p = c_getstr (src);
2583 /* If the string length is zero, return the dst parameter. */
2584 if (p && *p == '\0')
2585 return expand_expr (dst, target, mode, EXPAND_NORMAL);
2591 /* Expand expression EXP, which is a call to the strncat builtin.
2592 Return 0 if we failed the caller should emit a normal call,
2593 otherwise try to get the result in TARGET, if convenient. */
2596 expand_builtin_strncat (arglist, target, mode)
2599 enum machine_mode mode;
2601 if (!validate_arglist (arglist,
2602 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2606 tree dst = TREE_VALUE (arglist),
2607 src = TREE_VALUE (TREE_CHAIN (arglist)),
2608 len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2609 const char *p = c_getstr (src);
2611 /* If the requested length is zero, or the src parameter string
2612 length is zero, return the dst parameter. */
2613 if (integer_zerop (len) || (p && *p == '\0'))
2615 /* Evaluate and ignore the src and len parameters in case
2616 they have side-effects. */
2617 expand_expr (src, const0_rtx, VOIDmode, EXPAND_NORMAL);
2618 expand_expr (len, const0_rtx, VOIDmode, EXPAND_NORMAL);
2619 return expand_expr (dst, target, mode, EXPAND_NORMAL);
2622 /* If the requested len is greater than or equal to the string
2623 length, call strcat. */
2624 if (TREE_CODE (len) == INTEGER_CST && p
2625 && compare_tree_int (len, strlen (p)) >= 0)
2628 = tree_cons (NULL_TREE, dst, build_tree_list (NULL_TREE, src));
2629 tree fn = built_in_decls[BUILT_IN_STRCAT];
2631 /* If the replacement _DECL isn't initialized, don't do the
2636 return expand_expr (build_function_call_expr (fn, newarglist),
2637 target, mode, EXPAND_NORMAL);
2643 /* Expand expression EXP, which is a call to the strspn builtin.
2644 Return 0 if we failed the caller should emit a normal call,
2645 otherwise try to get the result in TARGET, if convenient. */
2648 expand_builtin_strspn (arglist, target, mode)
2651 enum machine_mode mode;
2653 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2657 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
2658 const char *p1 = c_getstr (s1), *p2 = c_getstr (s2);
2660 /* If both arguments are constants, evaluate at compile-time. */
2663 const size_t r = strspn (p1, p2);
2664 return expand_expr (size_int (r), target, mode, EXPAND_NORMAL);
2667 /* If either argument is "", return 0. */
2668 if ((p1 && *p1 == '\0') || (p2 && *p2 == '\0'))
2670 /* Evaluate and ignore both arguments in case either one has
2672 expand_expr (s1, const0_rtx, VOIDmode, EXPAND_NORMAL);
2673 expand_expr (s2, const0_rtx, VOIDmode, EXPAND_NORMAL);
2680 /* Expand expression EXP, which is a call to the strcspn builtin.
2681 Return 0 if we failed the caller should emit a normal call,
2682 otherwise try to get the result in TARGET, if convenient. */
2685 expand_builtin_strcspn (arglist, target, mode)
2688 enum machine_mode mode;
2690 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2694 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
2695 const char *p1 = c_getstr (s1), *p2 = c_getstr (s2);
2697 /* If both arguments are constants, evaluate at compile-time. */
2700 const size_t r = strcspn (p1, p2);
2701 return expand_expr (size_int (r), target, mode, EXPAND_NORMAL);
2704 /* If the first argument is "", return 0. */
2705 if (p1 && *p1 == '\0')
2707 /* Evaluate and ignore argument s2 in case it has
2709 expand_expr (s2, const0_rtx, VOIDmode, EXPAND_NORMAL);
2713 /* If the second argument is "", return __builtin_strlen(s1). */
2714 if (p2 && *p2 == '\0')
2716 tree newarglist = build_tree_list (NULL_TREE, s1),
2717 fn = built_in_decls[BUILT_IN_STRLEN];
2719 /* If the replacement _DECL isn't initialized, don't do the
2724 return expand_expr (build_function_call_expr (fn, newarglist),
2725 target, mode, EXPAND_NORMAL);
2731 /* Expand a call to __builtin_saveregs, generating the result in TARGET,
2732 if that's convenient. */
2735 expand_builtin_saveregs ()
2739 /* Don't do __builtin_saveregs more than once in a function.
2740 Save the result of the first call and reuse it. */
2741 if (saveregs_value != 0)
2742 return saveregs_value;
2744 /* When this function is called, it means that registers must be
2745 saved on entry to this function. So we migrate the call to the
2746 first insn of this function. */
2750 #ifdef EXPAND_BUILTIN_SAVEREGS
2751 /* Do whatever the machine needs done in this case. */
2752 val = EXPAND_BUILTIN_SAVEREGS ();
2754 /* ??? We used to try and build up a call to the out of line function,
2755 guessing about what registers needed saving etc. This became much
2756 harder with __builtin_va_start, since we don't have a tree for a
2757 call to __builtin_saveregs to fall back on. There was exactly one
2758 port (i860) that used this code, and I'm unconvinced it could actually
2759 handle the general case. So we no longer try to handle anything
2760 weird and make the backend absorb the evil. */
2762 error ("__builtin_saveregs not supported by this target");
2769 saveregs_value = val;
2771 /* Put the sequence after the NOTE that starts the function. If this
2772 is inside a SEQUENCE, make the outer-level insn chain current, so
2773 the code is placed at the start of the function. */
2774 push_topmost_sequence ();
2775 emit_insns_after (seq, get_insns ());
2776 pop_topmost_sequence ();
2781 /* __builtin_args_info (N) returns word N of the arg space info
2782 for the current function. The number and meanings of words
2783 is controlled by the definition of CUMULATIVE_ARGS. */
2786 expand_builtin_args_info (exp)
2789 tree arglist = TREE_OPERAND (exp, 1);
2790 int nwords = sizeof (CUMULATIVE_ARGS) / sizeof (int);
2791 int *word_ptr = (int *) ¤t_function_args_info;
2793 /* These are used by the code below that is if 0'ed away */
2795 tree type, elts, result;
2798 if (sizeof (CUMULATIVE_ARGS) % sizeof (int) != 0)
2803 if (!host_integerp (TREE_VALUE (arglist), 0))
2804 error ("argument of `__builtin_args_info' must be constant");
2807 HOST_WIDE_INT wordnum = tree_low_cst (TREE_VALUE (arglist), 0);
2809 if (wordnum < 0 || wordnum >= nwords)
2810 error ("argument of `__builtin_args_info' out of range");
2812 return GEN_INT (word_ptr[wordnum]);
2816 error ("missing argument in `__builtin_args_info'");
2821 for (i = 0; i < nwords; i++)
2822 elts = tree_cons (NULL_TREE, build_int_2 (word_ptr[i], 0));
2824 type = build_array_type (integer_type_node,
2825 build_index_type (build_int_2 (nwords, 0)));
2826 result = build (CONSTRUCTOR, type, NULL_TREE, nreverse (elts));
2827 TREE_CONSTANT (result) = 1;
2828 TREE_STATIC (result) = 1;
2829 result = build1 (INDIRECT_REF, build_pointer_type (type), result);
2830 TREE_CONSTANT (result) = 1;
2831 return expand_expr (result, NULL_RTX, VOIDmode, 0);
2835 /* Expand ARGLIST, from a call to __builtin_next_arg. */
2838 expand_builtin_next_arg (arglist)
2841 tree fntype = TREE_TYPE (current_function_decl);
2843 if ((TYPE_ARG_TYPES (fntype) == 0
2844 || (TREE_VALUE (tree_last (TYPE_ARG_TYPES (fntype)))
2846 && ! current_function_varargs)
2848 error ("`va_start' used in function with fixed args");
2854 tree last_parm = tree_last (DECL_ARGUMENTS (current_function_decl));
2855 tree arg = TREE_VALUE (arglist);
2857 /* Strip off all nops for the sake of the comparison. This
2858 is not quite the same as STRIP_NOPS. It does more.
2859 We must also strip off INDIRECT_EXPR for C++ reference
2861 while (TREE_CODE (arg) == NOP_EXPR
2862 || TREE_CODE (arg) == CONVERT_EXPR
2863 || TREE_CODE (arg) == NON_LVALUE_EXPR
2864 || TREE_CODE (arg) == INDIRECT_REF)
2865 arg = TREE_OPERAND (arg, 0);
2866 if (arg != last_parm)
2867 warning ("second parameter of `va_start' not last named argument");
2869 else if (! current_function_varargs)
2870 /* Evidently an out of date version of <stdarg.h>; can't validate
2871 va_start's second argument, but can still work as intended. */
2872 warning ("`__builtin_next_arg' called without an argument");
2874 return expand_binop (Pmode, add_optab,
2875 current_function_internal_arg_pointer,
2876 current_function_arg_offset_rtx,
2877 NULL_RTX, 0, OPTAB_LIB_WIDEN);
2880 /* Make it easier for the backends by protecting the valist argument
2881 from multiple evaluations. */
2884 stabilize_va_list (valist, needs_lvalue)
2888 if (TREE_CODE (va_list_type_node) == ARRAY_TYPE)
2890 if (TREE_SIDE_EFFECTS (valist))
2891 valist = save_expr (valist);
2893 /* For this case, the backends will be expecting a pointer to
2894 TREE_TYPE (va_list_type_node), but it's possible we've
2895 actually been given an array (an actual va_list_type_node).
2897 if (TREE_CODE (TREE_TYPE (valist)) == ARRAY_TYPE)
2899 tree p1 = build_pointer_type (TREE_TYPE (va_list_type_node));
2900 tree p2 = build_pointer_type (va_list_type_node);
2902 valist = build1 (ADDR_EXPR, p2, valist);
2903 valist = fold (build1 (NOP_EXPR, p1, valist));
2912 if (! TREE_SIDE_EFFECTS (valist))
2915 pt = build_pointer_type (va_list_type_node);
2916 valist = fold (build1 (ADDR_EXPR, pt, valist));
2917 TREE_SIDE_EFFECTS (valist) = 1;
2920 if (TREE_SIDE_EFFECTS (valist))
2921 valist = save_expr (valist);
2922 valist = fold (build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (valist)),
2929 /* The "standard" implementation of va_start: just assign `nextarg' to
2933 std_expand_builtin_va_start (stdarg_p, valist, nextarg)
2942 /* The dummy named parameter is declared as a 'word' sized
2943 object, but if a 'word' is smaller than an 'int', it would
2944 have been promoted to int when it was added to the arglist. */
2945 int align = PARM_BOUNDARY / BITS_PER_UNIT;
2946 int size = MAX (UNITS_PER_WORD,
2947 GET_MODE_SIZE (TYPE_MODE (integer_type_node)));
2948 int offset = ((size + align - 1) / align) * align;
2949 nextarg = plus_constant (nextarg, -offset);
2952 t = build (MODIFY_EXPR, TREE_TYPE (valist), valist,
2953 make_tree (ptr_type_node, nextarg));
2954 TREE_SIDE_EFFECTS (t) = 1;
2956 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
2959 /* Expand ARGLIST, which from a call to __builtin_stdarg_va_start or
2960 __builtin_varargs_va_start, depending on STDARG_P. */
2963 expand_builtin_va_start (stdarg_p, arglist)
2968 tree chain = arglist, valist;
2971 nextarg = expand_builtin_next_arg (chain = TREE_CHAIN (arglist));
2973 nextarg = expand_builtin_next_arg (NULL_TREE);
2975 if (TREE_CHAIN (chain))
2976 error ("too many arguments to function `va_start'");
2978 valist = stabilize_va_list (TREE_VALUE (arglist), 1);
2980 #ifdef EXPAND_BUILTIN_VA_START
2981 EXPAND_BUILTIN_VA_START (stdarg_p, valist, nextarg);
2983 std_expand_builtin_va_start (stdarg_p, valist, nextarg);
2989 /* The "standard" implementation of va_arg: read the value from the
2990 current (padded) address and increment by the (padded) size. */
2993 std_expand_builtin_va_arg (valist, type)
2996 tree addr_tree, t, type_size = NULL;
2997 tree align, alignm1;
3001 /* Compute the rounded size of the type. */
3002 align = size_int (PARM_BOUNDARY / BITS_PER_UNIT);
3003 alignm1 = size_int (PARM_BOUNDARY / BITS_PER_UNIT - 1);
3004 if (type == error_mark_node
3005 || (type_size = TYPE_SIZE_UNIT (TYPE_MAIN_VARIANT (type))) == NULL
3006 || TREE_OVERFLOW (type_size))
3007 rounded_size = size_zero_node;
3009 rounded_size = fold (build (MULT_EXPR, sizetype,
3010 fold (build (TRUNC_DIV_EXPR, sizetype,
3011 fold (build (PLUS_EXPR, sizetype,
3012 type_size, alignm1)),
3018 if (PAD_VARARGS_DOWN && ! integer_zerop (rounded_size))
3020 /* Small args are padded downward. */
3021 addr_tree = fold (build (PLUS_EXPR, TREE_TYPE (addr_tree), addr_tree,
3022 fold (build (COND_EXPR, sizetype,
3023 fold (build (GT_EXPR, sizetype,
3027 fold (build (MINUS_EXPR, sizetype,
3032 addr = expand_expr (addr_tree, NULL_RTX, Pmode, EXPAND_NORMAL);
3033 addr = copy_to_reg (addr);
3035 /* Compute new value for AP. */
3036 if (! integer_zerop (rounded_size))
3038 t = build (MODIFY_EXPR, TREE_TYPE (valist), valist,
3039 build (PLUS_EXPR, TREE_TYPE (valist), valist,
3041 TREE_SIDE_EFFECTS (t) = 1;
3042 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
3048 /* Expand __builtin_va_arg, which is not really a builtin function, but
3049 a very special sort of operator. */
3052 expand_builtin_va_arg (valist, type)
3056 tree promoted_type, want_va_type, have_va_type;
3058 /* Verify that valist is of the proper type. */
3060 want_va_type = va_list_type_node;
3061 have_va_type = TREE_TYPE (valist);
3062 if (TREE_CODE (want_va_type) == ARRAY_TYPE)
3064 /* If va_list is an array type, the argument may have decayed
3065 to a pointer type, e.g. by being passed to another function.
3066 In that case, unwrap both types so that we can compare the
3067 underlying records. */
3068 if (TREE_CODE (have_va_type) == ARRAY_TYPE
3069 || TREE_CODE (have_va_type) == POINTER_TYPE)
3071 want_va_type = TREE_TYPE (want_va_type);
3072 have_va_type = TREE_TYPE (have_va_type);
3075 if (TYPE_MAIN_VARIANT (want_va_type) != TYPE_MAIN_VARIANT (have_va_type))
3077 error ("first argument to `va_arg' not of type `va_list'");
3081 /* Generate a diagnostic for requesting data of a type that cannot
3082 be passed through `...' due to type promotion at the call site. */
3083 else if ((promoted_type = (*lang_type_promotes_to) (type)) != NULL_TREE)
3085 const char *name = "<anonymous type>", *pname = 0;
3086 static bool gave_help;
3088 if (TYPE_NAME (type))
3090 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
3091 name = IDENTIFIER_POINTER (TYPE_NAME (type));
3092 else if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
3093 && DECL_NAME (TYPE_NAME (type)))
3094 name = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type)));
3096 if (TYPE_NAME (promoted_type))
3098 if (TREE_CODE (TYPE_NAME (promoted_type)) == IDENTIFIER_NODE)
3099 pname = IDENTIFIER_POINTER (TYPE_NAME (promoted_type));
3100 else if (TREE_CODE (TYPE_NAME (promoted_type)) == TYPE_DECL
3101 && DECL_NAME (TYPE_NAME (promoted_type)))
3102 pname = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (promoted_type)));
3105 /* Unfortunately, this is merely undefined, rather than a constraint
3106 violation, so we cannot make this an error. If this call is never
3107 executed, the program is still strictly conforming. */
3108 warning ("`%s' is promoted to `%s' when passed through `...'",
3113 warning ("(so you should pass `%s' not `%s' to `va_arg')",
3117 /* We can, however, treat "undefined" any way we please.
3118 Call abort to encourage the user to fix the program. */
3119 expand_builtin_trap ();
3121 /* This is dead code, but go ahead and finish so that the
3122 mode of the result comes out right. */
3127 /* Make it easier for the backends by protecting the valist argument
3128 from multiple evaluations. */
3129 valist = stabilize_va_list (valist, 0);
3131 #ifdef EXPAND_BUILTIN_VA_ARG
3132 addr = EXPAND_BUILTIN_VA_ARG (valist, type);
3134 addr = std_expand_builtin_va_arg (valist, type);
3138 #ifdef POINTERS_EXTEND_UNSIGNED
3139 if (GET_MODE (addr) != Pmode)
3140 addr = convert_memory_address (Pmode, addr);
3143 result = gen_rtx_MEM (TYPE_MODE (type), addr);
3144 set_mem_alias_set (result, get_varargs_alias_set ());
3149 /* Expand ARGLIST, from a call to __builtin_va_end. */
3152 expand_builtin_va_end (arglist)
3155 tree valist = TREE_VALUE (arglist);
3157 #ifdef EXPAND_BUILTIN_VA_END
3158 valist = stabilize_va_list (valist, 0);
3159 EXPAND_BUILTIN_VA_END(arglist);
3161 /* Evaluate for side effects, if needed. I hate macros that don't
3163 if (TREE_SIDE_EFFECTS (valist))
3164 expand_expr (valist, const0_rtx, VOIDmode, EXPAND_NORMAL);
3170 /* Expand ARGLIST, from a call to __builtin_va_copy. We do this as a
3171 builtin rather than just as an assignment in stdarg.h because of the
3172 nastiness of array-type va_list types. */
3175 expand_builtin_va_copy (arglist)
3180 dst = TREE_VALUE (arglist);
3181 src = TREE_VALUE (TREE_CHAIN (arglist));
3183 dst = stabilize_va_list (dst, 1);
3184 src = stabilize_va_list (src, 0);
3186 if (TREE_CODE (va_list_type_node) != ARRAY_TYPE)
3188 t = build (MODIFY_EXPR, va_list_type_node, dst, src);
3189 TREE_SIDE_EFFECTS (t) = 1;
3190 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
3194 rtx dstb, srcb, size;
3196 /* Evaluate to pointers. */
3197 dstb = expand_expr (dst, NULL_RTX, Pmode, EXPAND_NORMAL);
3198 srcb = expand_expr (src, NULL_RTX, Pmode, EXPAND_NORMAL);
3199 size = expand_expr (TYPE_SIZE_UNIT (va_list_type_node), NULL_RTX,
3200 VOIDmode, EXPAND_NORMAL);
3202 #ifdef POINTERS_EXTEND_UNSIGNED
3203 if (GET_MODE (dstb) != Pmode)
3204 dstb = convert_memory_address (Pmode, dstb);
3206 if (GET_MODE (srcb) != Pmode)
3207 srcb = convert_memory_address (Pmode, srcb);
3210 /* "Dereference" to BLKmode memories. */
3211 dstb = gen_rtx_MEM (BLKmode, dstb);
3212 set_mem_alias_set (dstb, get_alias_set (TREE_TYPE (TREE_TYPE (dst))));
3213 set_mem_align (dstb, TYPE_ALIGN (va_list_type_node));
3214 srcb = gen_rtx_MEM (BLKmode, srcb);
3215 set_mem_alias_set (srcb, get_alias_set (TREE_TYPE (TREE_TYPE (src))));
3216 set_mem_align (srcb, TYPE_ALIGN (va_list_type_node));
3219 emit_block_move (dstb, srcb, size);
3225 /* Expand a call to one of the builtin functions __builtin_frame_address or
3226 __builtin_return_address. */
3229 expand_builtin_frame_address (exp)
3232 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
3233 tree arglist = TREE_OPERAND (exp, 1);
3235 /* The argument must be a nonnegative integer constant.
3236 It counts the number of frames to scan up the stack.
3237 The value is the return address saved in that frame. */
3239 /* Warning about missing arg was already issued. */
3241 else if (! host_integerp (TREE_VALUE (arglist), 1))
3243 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
3244 error ("invalid arg to `__builtin_frame_address'");
3246 error ("invalid arg to `__builtin_return_address'");
3252 = expand_builtin_return_addr (DECL_FUNCTION_CODE (fndecl),
3253 tree_low_cst (TREE_VALUE (arglist), 1),
3254 hard_frame_pointer_rtx);
3256 /* Some ports cannot access arbitrary stack frames. */
3259 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
3260 warning ("unsupported arg to `__builtin_frame_address'");
3262 warning ("unsupported arg to `__builtin_return_address'");
3266 /* For __builtin_frame_address, return what we've got. */
3267 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
3270 if (GET_CODE (tem) != REG
3271 && ! CONSTANT_P (tem))
3272 tem = copy_to_mode_reg (Pmode, tem);
3277 /* Expand a call to the alloca builtin, with arguments ARGLIST. Return 0 if
3278 we failed and the caller should emit a normal call, otherwise try to get
3279 the result in TARGET, if convenient. */
3282 expand_builtin_alloca (arglist, target)
3289 if (!validate_arglist (arglist, INTEGER_TYPE, VOID_TYPE))
3292 /* Compute the argument. */
3293 op0 = expand_expr (TREE_VALUE (arglist), NULL_RTX, VOIDmode, 0);
3295 /* Allocate the desired space. */
3296 result = allocate_dynamic_stack_space (op0, target, BITS_PER_UNIT);
3298 #ifdef POINTERS_EXTEND_UNSIGNED
3299 if (GET_MODE (result) != ptr_mode)
3300 result = convert_memory_address (ptr_mode, result);
3306 /* Expand a call to the ffs builtin. The arguments are in ARGLIST.
3307 Return 0 if a normal call should be emitted rather than expanding the
3308 function in-line. If convenient, the result should be placed in TARGET.
3309 SUBTARGET may be used as the target for computing one of EXP's operands. */
3312 expand_builtin_ffs (arglist, target, subtarget)
3314 rtx target, subtarget;
3317 if (!validate_arglist (arglist, INTEGER_TYPE, VOID_TYPE))
3320 /* Compute the argument. */
3321 op0 = expand_expr (TREE_VALUE (arglist), subtarget, VOIDmode, 0);
3322 /* Compute ffs, into TARGET if possible.
3323 Set TARGET to wherever the result comes back. */
3324 target = expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist))),
3325 ffs_optab, op0, target, 1);
3331 /* If the string passed to fputs is a constant and is one character
3332 long, we attempt to transform this call into __builtin_fputc(). */
3335 expand_builtin_fputs (arglist, ignore, unlocked)
3341 tree fn_fputc = unlocked ? built_in_decls[BUILT_IN_FPUTC_UNLOCKED]
3342 : built_in_decls[BUILT_IN_FPUTC];
3343 tree fn_fwrite = unlocked ? built_in_decls[BUILT_IN_FWRITE_UNLOCKED]
3344 : built_in_decls[BUILT_IN_FWRITE];
3346 /* If the return value is used, or the replacement _DECL isn't
3347 initialized, don't do the transformation. */
3348 if (!ignore || !fn_fputc || !fn_fwrite)
3351 /* Verify the arguments in the original call. */
3352 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
3355 /* Get the length of the string passed to fputs. If the length
3356 can't be determined, punt. */
3357 if (!(len = c_strlen (TREE_VALUE (arglist)))
3358 || TREE_CODE (len) != INTEGER_CST)
3361 switch (compare_tree_int (len, 1))
3363 case -1: /* length is 0, delete the call entirely . */
3365 /* Evaluate and ignore the argument in case it has
3367 expand_expr (TREE_VALUE (TREE_CHAIN (arglist)), const0_rtx,
3368 VOIDmode, EXPAND_NORMAL);
3371 case 0: /* length is 1, call fputc. */
3373 const char *p = c_getstr (TREE_VALUE (arglist));
3377 /* New argument list transforming fputs(string, stream) to
3378 fputc(string[0], stream). */
3380 build_tree_list (NULL_TREE, TREE_VALUE (TREE_CHAIN (arglist)));
3382 tree_cons (NULL_TREE, build_int_2 (p[0], 0), arglist);
3388 case 1: /* length is greater than 1, call fwrite. */
3390 tree string_arg = TREE_VALUE (arglist);
3392 /* New argument list transforming fputs(string, stream) to
3393 fwrite(string, 1, len, stream). */
3394 arglist = build_tree_list (NULL_TREE, TREE_VALUE (TREE_CHAIN (arglist)));
3395 arglist = tree_cons (NULL_TREE, len, arglist);
3396 arglist = tree_cons (NULL_TREE, size_one_node, arglist);
3397 arglist = tree_cons (NULL_TREE, string_arg, arglist);
3405 return expand_expr (build_function_call_expr (fn, arglist),
3406 (ignore ? const0_rtx : NULL_RTX),
3407 VOIDmode, EXPAND_NORMAL);
3410 /* Expand a call to __builtin_expect. We return our argument and emit a
3411 NOTE_INSN_EXPECTED_VALUE note. This is the expansion of __builtin_expect in
3412 a non-jump context. */
3415 expand_builtin_expect (arglist, target)
3422 if (arglist == NULL_TREE
3423 || TREE_CHAIN (arglist) == NULL_TREE)
3425 exp = TREE_VALUE (arglist);
3426 c = TREE_VALUE (TREE_CHAIN (arglist));
3428 if (TREE_CODE (c) != INTEGER_CST)
3430 error ("second arg to `__builtin_expect' must be a constant");
3431 c = integer_zero_node;
3434 target = expand_expr (exp, target, VOIDmode, EXPAND_NORMAL);
3436 /* Don't bother with expected value notes for integral constants. */
3437 if (GET_CODE (target) != CONST_INT)
3439 /* We do need to force this into a register so that we can be
3440 moderately sure to be able to correctly interpret the branch
3442 target = force_reg (GET_MODE (target), target);
3444 rtx_c = expand_expr (c, NULL_RTX, GET_MODE (target), EXPAND_NORMAL);
3446 note = emit_note (NULL, NOTE_INSN_EXPECTED_VALUE);
3447 NOTE_EXPECTED_VALUE (note) = gen_rtx_EQ (VOIDmode, target, rtx_c);
3453 /* Like expand_builtin_expect, except do this in a jump context. This is
3454 called from do_jump if the conditional is a __builtin_expect. Return either
3455 a SEQUENCE of insns to emit the jump or NULL if we cannot optimize
3456 __builtin_expect. We need to optimize this at jump time so that machines
3457 like the PowerPC don't turn the test into a SCC operation, and then jump
3458 based on the test being 0/1. */
3461 expand_builtin_expect_jump (exp, if_false_label, if_true_label)
3466 tree arglist = TREE_OPERAND (exp, 1);
3467 tree arg0 = TREE_VALUE (arglist);
3468 tree arg1 = TREE_VALUE (TREE_CHAIN (arglist));
3471 /* Only handle __builtin_expect (test, 0) and
3472 __builtin_expect (test, 1). */
3473 if (TREE_CODE (TREE_TYPE (arg1)) == INTEGER_TYPE
3474 && (integer_zerop (arg1) || integer_onep (arg1)))
3479 /* If we fail to locate an appropriate conditional jump, we'll
3480 fall back to normal evaluation. Ensure that the expression
3481 can be re-evaluated. */
3482 switch (unsafe_for_reeval (arg0))
3487 case 1: /* Mildly unsafe. */
3488 arg0 = unsave_expr (arg0);
3491 case 2: /* Wildly unsafe. */
3495 /* Expand the jump insns. */
3497 do_jump (arg0, if_false_label, if_true_label);
3498 ret = gen_sequence ();
3501 /* Now that the __builtin_expect has been validated, go through and add
3502 the expect's to each of the conditional jumps. If we run into an
3503 error, just give up and generate the 'safe' code of doing a SCC
3504 operation and then doing a branch on that. */
3505 for (j = 0; j < XVECLEN (ret, 0); j++)
3507 rtx insn = XVECEXP (ret, 0, j);
3510 if (GET_CODE (insn) == JUMP_INSN && any_condjump_p (insn)
3511 && (pattern = pc_set (insn)) != NULL_RTX)
3513 rtx ifelse = SET_SRC (pattern);
3517 if (GET_CODE (ifelse) != IF_THEN_ELSE)
3520 if (GET_CODE (XEXP (ifelse, 1)) == LABEL_REF)
3523 label = XEXP (XEXP (ifelse, 1), 0);
3525 /* An inverted jump reverses the probabilities. */
3526 else if (GET_CODE (XEXP (ifelse, 2)) == LABEL_REF)
3529 label = XEXP (XEXP (ifelse, 2), 0);
3531 /* We shouldn't have to worry about conditional returns during
3532 the expansion stage, but handle it gracefully anyway. */
3533 else if (GET_CODE (XEXP (ifelse, 1)) == RETURN)
3538 /* An inverted return reverses the probabilities. */
3539 else if (GET_CODE (XEXP (ifelse, 2)) == RETURN)
3547 /* If the test is expected to fail, reverse the
3549 if (integer_zerop (arg1))
3552 /* If we are jumping to the false label, reverse the
3554 if (label == NULL_RTX)
3555 ; /* conditional return */
3556 else if (label == if_false_label)
3558 else if (label != if_true_label)
3562 predict_insn_def (insn, PRED_BUILTIN_EXPECT, taken);
3566 /* If no jumps were modified, fail and do __builtin_expect the normal
3576 expand_builtin_trap ()
3580 emit_insn (gen_trap ());
3583 emit_library_call (abort_libfunc, LCT_NORETURN, VOIDmode, 0);
3587 /* Expand an expression EXP that calls a built-in function,
3588 with result going to TARGET if that's convenient
3589 (and in mode MODE if that's convenient).
3590 SUBTARGET may be used as the target for computing one of EXP's operands.
3591 IGNORE is nonzero if the value is to be ignored. */
3594 expand_builtin (exp, target, subtarget, mode, ignore)
3598 enum machine_mode mode;
3601 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
3602 tree arglist = TREE_OPERAND (exp, 1);
3603 enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
3605 if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_MD)
3606 return (*targetm.expand_builtin) (exp, target, subtarget, mode, ignore);
3608 /* When not optimizing, generate calls to library functions for a certain
3610 if (!optimize && !CALLED_AS_BUILT_IN (fndecl))
3616 case BUILT_IN_SQRTF:
3617 case BUILT_IN_SQRTL:
3618 case BUILT_IN_MEMSET:
3619 case BUILT_IN_MEMCPY:
3620 case BUILT_IN_MEMCMP:
3622 case BUILT_IN_BZERO:
3623 case BUILT_IN_INDEX:
3624 case BUILT_IN_RINDEX:
3625 case BUILT_IN_STRCHR:
3626 case BUILT_IN_STRRCHR:
3627 case BUILT_IN_STRLEN:
3628 case BUILT_IN_STRCPY:
3629 case BUILT_IN_STRNCPY:
3630 case BUILT_IN_STRNCMP:
3631 case BUILT_IN_STRSTR:
3632 case BUILT_IN_STRPBRK:
3633 case BUILT_IN_STRCAT:
3634 case BUILT_IN_STRNCAT:
3635 case BUILT_IN_STRSPN:
3636 case BUILT_IN_STRCSPN:
3637 case BUILT_IN_STRCMP:
3639 case BUILT_IN_PUTCHAR:
3641 case BUILT_IN_PRINTF:
3642 case BUILT_IN_FPUTC:
3643 case BUILT_IN_FPUTS:
3644 case BUILT_IN_FWRITE:
3645 case BUILT_IN_PUTCHAR_UNLOCKED:
3646 case BUILT_IN_PUTS_UNLOCKED:
3647 case BUILT_IN_PRINTF_UNLOCKED:
3648 case BUILT_IN_FPUTC_UNLOCKED:
3649 case BUILT_IN_FPUTS_UNLOCKED:
3650 case BUILT_IN_FWRITE_UNLOCKED:
3651 return expand_call (exp, target, ignore);
3661 case BUILT_IN_LLABS:
3662 case BUILT_IN_IMAXABS:
3664 case BUILT_IN_FABSF:
3665 case BUILT_IN_FABSL:
3666 /* build_function_call changes these into ABS_EXPR. */
3670 case BUILT_IN_CONJF:
3671 case BUILT_IN_CONJL:
3672 case BUILT_IN_CREAL:
3673 case BUILT_IN_CREALF:
3674 case BUILT_IN_CREALL:
3675 case BUILT_IN_CIMAG:
3676 case BUILT_IN_CIMAGF:
3677 case BUILT_IN_CIMAGL:
3678 /* expand_tree_builtin changes these into CONJ_EXPR, REALPART_EXPR
3679 and IMAGPART_EXPR. */
3688 /* Treat these like sqrt only if unsafe math optimizations are allowed,
3689 because of possible accuracy problems. */
3690 if (! flag_unsafe_math_optimizations)
3693 case BUILT_IN_SQRTF:
3694 case BUILT_IN_SQRTL:
3695 target = expand_builtin_mathfn (exp, target, subtarget);
3703 case BUILT_IN_APPLY_ARGS:
3704 return expand_builtin_apply_args ();
3706 /* __builtin_apply (FUNCTION, ARGUMENTS, ARGSIZE) invokes
3707 FUNCTION with a copy of the parameters described by
3708 ARGUMENTS, and ARGSIZE. It returns a block of memory
3709 allocated on the stack into which is stored all the registers
3710 that might possibly be used for returning the result of a
3711 function. ARGUMENTS is the value returned by
3712 __builtin_apply_args. ARGSIZE is the number of bytes of
3713 arguments that must be copied. ??? How should this value be
3714 computed? We'll also need a safe worst case value for varargs
3716 case BUILT_IN_APPLY:
3717 if (!validate_arglist (arglist, POINTER_TYPE,
3718 POINTER_TYPE, INTEGER_TYPE, VOID_TYPE)
3719 && !validate_arglist (arglist, REFERENCE_TYPE,
3720 POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
3728 for (t = arglist, i = 0; t; t = TREE_CHAIN (t), i++)
3729 ops[i] = expand_expr (TREE_VALUE (t), NULL_RTX, VOIDmode, 0);
3731 return expand_builtin_apply (ops[0], ops[1], ops[2]);
3734 /* __builtin_return (RESULT) causes the function to return the
3735 value described by RESULT. RESULT is address of the block of
3736 memory returned by __builtin_apply. */
3737 case BUILT_IN_RETURN:
3738 if (validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
3739 expand_builtin_return (expand_expr (TREE_VALUE (arglist),
3740 NULL_RTX, VOIDmode, 0));
3743 case BUILT_IN_SAVEREGS:
3744 return expand_builtin_saveregs ();
3746 case BUILT_IN_ARGS_INFO:
3747 return expand_builtin_args_info (exp);
3749 /* Return the address of the first anonymous stack arg. */
3750 case BUILT_IN_NEXT_ARG:
3751 return expand_builtin_next_arg (arglist);
3753 case BUILT_IN_CLASSIFY_TYPE:
3754 return expand_builtin_classify_type (arglist);
3756 case BUILT_IN_CONSTANT_P:
3757 return expand_builtin_constant_p (exp);
3759 case BUILT_IN_FRAME_ADDRESS:
3760 case BUILT_IN_RETURN_ADDRESS:
3761 return expand_builtin_frame_address (exp);
3763 /* Returns the address of the area where the structure is returned.
3765 case BUILT_IN_AGGREGATE_INCOMING_ADDRESS:
3767 || ! AGGREGATE_TYPE_P (TREE_TYPE (TREE_TYPE (current_function_decl)))
3768 || GET_CODE (DECL_RTL (DECL_RESULT (current_function_decl))) != MEM)
3771 return XEXP (DECL_RTL (DECL_RESULT (current_function_decl)), 0);
3773 case BUILT_IN_ALLOCA:
3774 target = expand_builtin_alloca (arglist, target);
3780 target = expand_builtin_ffs (arglist, target, subtarget);
3785 case BUILT_IN_STRLEN:
3786 target = expand_builtin_strlen (exp, target);
3791 case BUILT_IN_STRCPY:
3792 target = expand_builtin_strcpy (exp, target, mode);
3797 case BUILT_IN_STRNCPY:
3798 target = expand_builtin_strncpy (arglist, target, mode);
3803 case BUILT_IN_STRCAT:
3804 target = expand_builtin_strcat (arglist, target, mode);
3809 case BUILT_IN_STRNCAT:
3810 target = expand_builtin_strncat (arglist, target, mode);
3815 case BUILT_IN_STRSPN:
3816 target = expand_builtin_strspn (arglist, target, mode);
3821 case BUILT_IN_STRCSPN:
3822 target = expand_builtin_strcspn (arglist, target, mode);
3827 case BUILT_IN_STRSTR:
3828 target = expand_builtin_strstr (arglist, target, mode);
3833 case BUILT_IN_STRPBRK:
3834 target = expand_builtin_strpbrk (arglist, target, mode);
3839 case BUILT_IN_INDEX:
3840 case BUILT_IN_STRCHR:
3841 target = expand_builtin_strchr (arglist, target, mode);
3846 case BUILT_IN_RINDEX:
3847 case BUILT_IN_STRRCHR:
3848 target = expand_builtin_strrchr (arglist, target, mode);
3853 case BUILT_IN_MEMCPY:
3854 target = expand_builtin_memcpy (arglist, target, mode);
3859 case BUILT_IN_MEMSET:
3860 target = expand_builtin_memset (exp, target, mode);
3865 case BUILT_IN_BZERO:
3866 target = expand_builtin_bzero (exp);
3871 case BUILT_IN_STRCMP:
3872 target = expand_builtin_strcmp (exp, target, mode);
3877 case BUILT_IN_STRNCMP:
3878 target = expand_builtin_strncmp (exp, target, mode);
3884 case BUILT_IN_MEMCMP:
3885 target = expand_builtin_memcmp (exp, arglist, target, mode);
3890 case BUILT_IN_SETJMP:
3891 target = expand_builtin_setjmp (arglist, target);
3896 /* __builtin_longjmp is passed a pointer to an array of five words.
3897 It's similar to the C library longjmp function but works with
3898 __builtin_setjmp above. */
3899 case BUILT_IN_LONGJMP:
3900 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
3904 rtx buf_addr = expand_expr (TREE_VALUE (arglist), subtarget,
3906 rtx value = expand_expr (TREE_VALUE (TREE_CHAIN (arglist)),
3907 NULL_RTX, VOIDmode, 0);
3909 if (value != const1_rtx)
3911 error ("__builtin_longjmp second argument must be 1");
3915 expand_builtin_longjmp (buf_addr, value);
3920 expand_builtin_trap ();
3923 case BUILT_IN_PUTCHAR:
3925 case BUILT_IN_FPUTC:
3926 case BUILT_IN_FWRITE:
3927 case BUILT_IN_PUTCHAR_UNLOCKED:
3928 case BUILT_IN_PUTS_UNLOCKED:
3929 case BUILT_IN_FPUTC_UNLOCKED:
3930 case BUILT_IN_FWRITE_UNLOCKED:
3932 case BUILT_IN_FPUTS:
3933 target = expand_builtin_fputs (arglist, ignore,/*unlocked=*/ 0);
3937 case BUILT_IN_FPUTS_UNLOCKED:
3938 target = expand_builtin_fputs (arglist, ignore,/*unlocked=*/ 1);
3943 /* Various hooks for the DWARF 2 __throw routine. */
3944 case BUILT_IN_UNWIND_INIT:
3945 expand_builtin_unwind_init ();
3947 case BUILT_IN_DWARF_CFA:
3948 return virtual_cfa_rtx;
3949 #ifdef DWARF2_UNWIND_INFO
3950 case BUILT_IN_DWARF_FP_REGNUM:
3951 return expand_builtin_dwarf_fp_regnum ();
3952 case BUILT_IN_INIT_DWARF_REG_SIZES:
3953 expand_builtin_init_dwarf_reg_sizes (TREE_VALUE (arglist));
3956 case BUILT_IN_FROB_RETURN_ADDR:
3957 return expand_builtin_frob_return_addr (TREE_VALUE (arglist));
3958 case BUILT_IN_EXTRACT_RETURN_ADDR:
3959 return expand_builtin_extract_return_addr (TREE_VALUE (arglist));
3960 case BUILT_IN_EH_RETURN:
3961 expand_builtin_eh_return (TREE_VALUE (arglist),
3962 TREE_VALUE (TREE_CHAIN (arglist)));
3964 #ifdef EH_RETURN_DATA_REGNO
3965 case BUILT_IN_EH_RETURN_DATA_REGNO:
3966 return expand_builtin_eh_return_data_regno (arglist);
3968 case BUILT_IN_VARARGS_START:
3969 return expand_builtin_va_start (0, arglist);
3970 case BUILT_IN_STDARG_START:
3971 return expand_builtin_va_start (1, arglist);
3972 case BUILT_IN_VA_END:
3973 return expand_builtin_va_end (arglist);
3974 case BUILT_IN_VA_COPY:
3975 return expand_builtin_va_copy (arglist);
3976 case BUILT_IN_EXPECT:
3977 return expand_builtin_expect (arglist, target);
3978 case BUILT_IN_PREFETCH:
3979 expand_builtin_prefetch (arglist);
3983 default: /* just do library call, if unknown builtin */
3984 error ("built-in function `%s' not currently supported",
3985 IDENTIFIER_POINTER (DECL_NAME (fndecl)));
3988 /* The switch statement above can drop through to cause the function
3989 to be called normally. */
3990 return expand_call (exp, target, ignore);
3993 /* Fold a call to __builtin_constant_p, if we know it will evaluate to a
3994 constant. ARGLIST is the argument list of the call. */
3997 fold_builtin_constant_p (arglist)
4003 arglist = TREE_VALUE (arglist);
4005 /* We return 1 for a numeric type that's known to be a constant
4006 value at compile-time or for an aggregate type that's a
4007 literal constant. */
4008 STRIP_NOPS (arglist);
4010 /* If we know this is a constant, emit the constant of one. */
4011 if (TREE_CODE_CLASS (TREE_CODE (arglist)) == 'c'
4012 || (TREE_CODE (arglist) == CONSTRUCTOR
4013 && TREE_CONSTANT (arglist))
4014 || (TREE_CODE (arglist) == ADDR_EXPR
4015 && TREE_CODE (TREE_OPERAND (arglist, 0)) == STRING_CST))
4016 return integer_one_node;
4018 /* If we aren't going to be running CSE or this expression
4019 has side effects, show we don't know it to be a constant.
4020 Likewise if it's a pointer or aggregate type since in those
4021 case we only want literals, since those are only optimized
4022 when generating RTL, not later.
4023 And finally, if we are compiling an initializer, not code, we
4024 need to return a definite result now; there's not going to be any
4025 more optimization done. */
4026 if (TREE_SIDE_EFFECTS (arglist) || cse_not_expected
4027 || AGGREGATE_TYPE_P (TREE_TYPE (arglist))
4028 || POINTER_TYPE_P (TREE_TYPE (arglist))
4030 return integer_zero_node;
4035 /* Fold a call to __builtin_classify_type. */
4038 fold_builtin_classify_type (arglist)
4042 return build_int_2 (no_type_class, 0);
4044 return build_int_2 (type_to_class (TREE_TYPE (TREE_VALUE (arglist))), 0);
4047 /* Used by constant folding to eliminate some builtin calls early. EXP is
4048 the CALL_EXPR of a call to a builtin function. */
4054 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
4055 tree arglist = TREE_OPERAND (exp, 1);
4056 enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
4058 if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_MD)
4063 case BUILT_IN_CONSTANT_P:
4064 return fold_builtin_constant_p (arglist);
4066 case BUILT_IN_CLASSIFY_TYPE:
4067 return fold_builtin_classify_type (arglist);
4069 case BUILT_IN_STRLEN:
4070 if (validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
4072 tree len = c_strlen (TREE_VALUE (arglist));
4086 build_function_call_expr (fn, arglist)
4091 call_expr = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (fn)), fn);
4092 call_expr = build (CALL_EXPR, TREE_TYPE (TREE_TYPE (fn)),
4093 call_expr, arglist);
4094 TREE_SIDE_EFFECTS (call_expr) = 1;
4095 return fold (call_expr);
4098 /* This function validates the types of a function call argument list
4099 represented as a tree chain of parameters against a specified list
4100 of tree_codes. If the last specifier is a 0, that represents an
4101 ellipses, otherwise the last specifier must be a VOID_TYPE. */
4104 validate_arglist VPARAMS ((tree arglist, ...))
4106 enum tree_code code;
4109 VA_OPEN (ap, arglist);
4110 VA_FIXEDARG (ap, tree, arglist);
4113 code = va_arg (ap, enum tree_code);
4117 /* This signifies an ellipses, any further arguments are all ok. */
4121 /* This signifies an endlink, if no arguments remain, return
4122 true, otherwise return false. */
4126 /* If no parameters remain or the parameter's code does not
4127 match the specified code, return false. Otherwise continue
4128 checking any remaining arguments. */
4129 if (arglist == 0 || code != TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))))
4133 arglist = TREE_CHAIN (arglist);
4136 /* We need gotos here since we can only have one VA_CLOSE in a
4144 /* Default version of target-specific builtin setup that does nothing. */
4147 default_init_builtins ()
4151 /* Default target-specific builtin expander that does nothing. */
4154 default_expand_builtin (exp, target, subtarget, mode, ignore)
4155 tree exp ATTRIBUTE_UNUSED;
4156 rtx target ATTRIBUTE_UNUSED;
4157 rtx subtarget ATTRIBUTE_UNUSED;
4158 enum machine_mode mode ATTRIBUTE_UNUSED;
4159 int ignore ATTRIBUTE_UNUSED;