1 /* Expand builtin functions.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
30 #include "hard-reg-set.h"
33 #include "insn-config.h"
39 #include "typeclass.h"
45 #define CALLED_AS_BUILT_IN(NODE) \
46 (!strncmp (IDENTIFIER_POINTER (DECL_NAME (NODE)), "__builtin_", 10))
48 /* Register mappings for target machines without register windows. */
49 #ifndef INCOMING_REGNO
50 #define INCOMING_REGNO(OUT) (OUT)
52 #ifndef OUTGOING_REGNO
53 #define OUTGOING_REGNO(IN) (IN)
56 #ifndef PAD_VARARGS_DOWN
57 #define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
60 /* Define the names of the builtin function types and codes. */
61 const char *const built_in_class_names
[4]
62 = {"NOT_BUILT_IN", "BUILT_IN_FRONTEND", "BUILT_IN_MD", "BUILT_IN_NORMAL"};
64 #define DEF_BUILTIN(X, N, C, T, LT, B, F, NA) STRINGX(X),
65 const char *const built_in_names
[(int) END_BUILTINS
] =
67 #include "builtins.def"
71 /* Setup an array of _DECL trees, make sure each element is
72 initialized to NULL_TREE. */
73 tree built_in_decls
[(int) END_BUILTINS
];
75 tree (*lang_type_promotes_to
) PARAMS ((tree
));
77 static int get_pointer_alignment
PARAMS ((tree
, unsigned int));
78 static tree c_strlen
PARAMS ((tree
));
79 static const char *c_getstr
PARAMS ((tree
));
80 static rtx c_readstr
PARAMS ((const char *,
82 static int target_char_cast
PARAMS ((tree
, char *));
83 static rtx get_memory_rtx
PARAMS ((tree
));
84 static int apply_args_size
PARAMS ((void));
85 static int apply_result_size
PARAMS ((void));
86 #if defined (HAVE_untyped_call) || defined (HAVE_untyped_return)
87 static rtx result_vector
PARAMS ((int, rtx
));
89 static rtx expand_builtin_setjmp
PARAMS ((tree
, rtx
));
90 static void expand_builtin_prefetch
PARAMS ((tree
));
91 static rtx expand_builtin_apply_args
PARAMS ((void));
92 static rtx expand_builtin_apply_args_1
PARAMS ((void));
93 static rtx expand_builtin_apply
PARAMS ((rtx
, rtx
, rtx
));
94 static void expand_builtin_return
PARAMS ((rtx
));
95 static enum type_class type_to_class
PARAMS ((tree
));
96 static rtx expand_builtin_classify_type
PARAMS ((tree
));
97 static rtx expand_builtin_mathfn
PARAMS ((tree
, rtx
, rtx
));
98 static rtx expand_builtin_constant_p
PARAMS ((tree
));
99 static rtx expand_builtin_args_info
PARAMS ((tree
));
100 static rtx expand_builtin_next_arg
PARAMS ((tree
));
101 static rtx expand_builtin_va_start
PARAMS ((int, tree
));
102 static rtx expand_builtin_va_end
PARAMS ((tree
));
103 static rtx expand_builtin_va_copy
PARAMS ((tree
));
104 static rtx expand_builtin_memcmp
PARAMS ((tree
, tree
, rtx
,
106 static rtx expand_builtin_strcmp
PARAMS ((tree
, rtx
,
108 static rtx expand_builtin_strncmp
PARAMS ((tree
, rtx
,
110 static rtx builtin_memcpy_read_str
PARAMS ((PTR
, HOST_WIDE_INT
,
112 static rtx expand_builtin_strcat
PARAMS ((tree
, rtx
,
114 static rtx expand_builtin_strncat
PARAMS ((tree
, rtx
,
116 static rtx expand_builtin_strspn
PARAMS ((tree
, rtx
,
118 static rtx expand_builtin_strcspn
PARAMS ((tree
, rtx
,
120 static rtx expand_builtin_memcpy
PARAMS ((tree
, rtx
,
122 static rtx expand_builtin_strcpy
PARAMS ((tree
, rtx
,
124 static rtx builtin_strncpy_read_str
PARAMS ((PTR
, HOST_WIDE_INT
,
126 static rtx expand_builtin_strncpy
PARAMS ((tree
, rtx
,
128 static rtx builtin_memset_read_str
PARAMS ((PTR
, HOST_WIDE_INT
,
130 static rtx expand_builtin_memset
PARAMS ((tree
, rtx
,
132 static rtx expand_builtin_bzero
PARAMS ((tree
));
133 static rtx expand_builtin_strlen
PARAMS ((tree
, rtx
));
134 static rtx expand_builtin_strstr
PARAMS ((tree
, rtx
,
136 static rtx expand_builtin_strpbrk
PARAMS ((tree
, rtx
,
138 static rtx expand_builtin_strchr
PARAMS ((tree
, rtx
,
140 static rtx expand_builtin_strrchr
PARAMS ((tree
, rtx
,
142 static rtx expand_builtin_alloca
PARAMS ((tree
, rtx
));
143 static rtx expand_builtin_ffs
PARAMS ((tree
, rtx
, rtx
));
144 static rtx expand_builtin_frame_address
PARAMS ((tree
));
145 static rtx expand_builtin_fputs
PARAMS ((tree
, int, int));
146 static tree stabilize_va_list
PARAMS ((tree
, int));
147 static rtx expand_builtin_expect
PARAMS ((tree
, rtx
));
148 static tree fold_builtin_constant_p
PARAMS ((tree
));
149 static tree fold_builtin_classify_type
PARAMS ((tree
));
150 static tree build_function_call_expr
PARAMS ((tree
, tree
));
151 static int validate_arglist
PARAMS ((tree
, ...));
153 /* Return the alignment in bits of EXP, a pointer valued expression.
154 But don't return more than MAX_ALIGN no matter what.
155 The alignment returned is, by default, the alignment of the thing that
156 EXP points to. If it is not a POINTER_TYPE, 0 is returned.
158 Otherwise, look at the expression to see if we can do better, i.e., if the
159 expression is actually pointing at an object whose alignment is tighter. */
162 get_pointer_alignment (exp
, max_align
)
164 unsigned int max_align
;
166 unsigned int align
, inner
;
168 if (TREE_CODE (TREE_TYPE (exp
)) != POINTER_TYPE
)
171 align
= TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp
)));
172 align
= MIN (align
, max_align
);
176 switch (TREE_CODE (exp
))
180 case NON_LVALUE_EXPR
:
181 exp
= TREE_OPERAND (exp
, 0);
182 if (TREE_CODE (TREE_TYPE (exp
)) != POINTER_TYPE
)
185 inner
= TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp
)));
186 align
= MIN (inner
, max_align
);
190 /* If sum of pointer + int, restrict our maximum alignment to that
191 imposed by the integer. If not, we can't do any better than
193 if (! host_integerp (TREE_OPERAND (exp
, 1), 1))
196 while (((tree_low_cst (TREE_OPERAND (exp
, 1), 1))
197 & (max_align
/ BITS_PER_UNIT
- 1))
201 exp
= TREE_OPERAND (exp
, 0);
205 /* See what we are pointing at and look at its alignment. */
206 exp
= TREE_OPERAND (exp
, 0);
207 if (TREE_CODE (exp
) == FUNCTION_DECL
)
208 align
= FUNCTION_BOUNDARY
;
209 else if (DECL_P (exp
))
210 align
= DECL_ALIGN (exp
);
211 #ifdef CONSTANT_ALIGNMENT
212 else if (TREE_CODE_CLASS (TREE_CODE (exp
)) == 'c')
213 align
= CONSTANT_ALIGNMENT (exp
, align
);
215 return MIN (align
, max_align
);
223 /* Compute the length of a C string. TREE_STRING_LENGTH is not the right
224 way, because it could contain a zero byte in the middle.
225 TREE_STRING_LENGTH is the size of the character array, not the string.
227 The value returned is of type `ssizetype'.
229 Unfortunately, string_constant can't access the values of const char
230 arrays with initializers, so neither can we do so here. */
237 HOST_WIDE_INT offset
;
241 src
= string_constant (src
, &offset_node
);
245 max
= TREE_STRING_LENGTH (src
) - 1;
246 ptr
= TREE_STRING_POINTER (src
);
248 if (offset_node
&& TREE_CODE (offset_node
) != INTEGER_CST
)
250 /* If the string has an internal zero byte (e.g., "foo\0bar"), we can't
251 compute the offset to the following null if we don't know where to
252 start searching for it. */
255 for (i
= 0; i
< max
; i
++)
259 /* We don't know the starting offset, but we do know that the string
260 has no internal zero bytes. We can assume that the offset falls
261 within the bounds of the string; otherwise, the programmer deserves
262 what he gets. Subtract the offset from the length of the string,
263 and return that. This would perhaps not be valid if we were dealing
264 with named arrays in addition to literal string constants. */
266 return size_diffop (size_int (max
), offset_node
);
269 /* We have a known offset into the string. Start searching there for
270 a null character if we can represent it as a single HOST_WIDE_INT. */
271 if (offset_node
== 0)
273 else if (! host_integerp (offset_node
, 0))
276 offset
= tree_low_cst (offset_node
, 0);
278 /* If the offset is known to be out of bounds, warn, and call strlen at
280 if (offset
< 0 || offset
> max
)
282 warning ("offset outside bounds of constant string");
286 /* Use strlen to search for the first zero byte. Since any strings
287 constructed with build_string will have nulls appended, we win even
288 if we get handed something like (char[4])"abcd".
290 Since OFFSET is our starting index into the string, no further
291 calculation is needed. */
292 return ssize_int (strlen (ptr
+ offset
));
295 /* Return a char pointer for a C string if it is a string constant
296 or sum of string constant and integer constant. */
304 src
= string_constant (src
, &offset_node
);
308 if (offset_node
== 0)
309 return TREE_STRING_POINTER (src
);
310 else if (!host_integerp (offset_node
, 1)
311 || compare_tree_int (offset_node
, TREE_STRING_LENGTH (src
) - 1) > 0)
314 return TREE_STRING_POINTER (src
) + tree_low_cst (offset_node
, 1);
317 /* Return a CONST_INT or CONST_DOUBLE corresponding to target reading
318 GET_MODE_BITSIZE (MODE) bits from string constant STR. */
321 c_readstr (str
, mode
)
323 enum machine_mode mode
;
329 if (GET_MODE_CLASS (mode
) != MODE_INT
)
334 for (i
= 0; i
< GET_MODE_SIZE (mode
); i
++)
337 if (WORDS_BIG_ENDIAN
)
338 j
= GET_MODE_SIZE (mode
) - i
- 1;
339 if (BYTES_BIG_ENDIAN
!= WORDS_BIG_ENDIAN
340 && GET_MODE_SIZE (mode
) > UNITS_PER_WORD
)
341 j
= j
+ UNITS_PER_WORD
- 2 * (j
% UNITS_PER_WORD
) - 1;
343 if (j
> 2 * HOST_BITS_PER_WIDE_INT
)
346 ch
= (unsigned char) str
[i
];
347 c
[j
/ HOST_BITS_PER_WIDE_INT
] |= ch
<< (j
% HOST_BITS_PER_WIDE_INT
);
349 return immed_double_const (c
[0], c
[1], mode
);
352 /* Cast a target constant CST to target CHAR and if that value fits into
353 host char type, return zero and put that value into variable pointed by
357 target_char_cast (cst
, p
)
361 unsigned HOST_WIDE_INT val
, hostval
;
363 if (!host_integerp (cst
, 1)
364 || CHAR_TYPE_SIZE
> HOST_BITS_PER_WIDE_INT
)
367 val
= tree_low_cst (cst
, 1);
368 if (CHAR_TYPE_SIZE
< HOST_BITS_PER_WIDE_INT
)
369 val
&= (((unsigned HOST_WIDE_INT
) 1) << CHAR_TYPE_SIZE
) - 1;
372 if (HOST_BITS_PER_CHAR
< HOST_BITS_PER_WIDE_INT
)
373 hostval
&= (((unsigned HOST_WIDE_INT
) 1) << HOST_BITS_PER_CHAR
) - 1;
382 /* Given TEM, a pointer to a stack frame, follow the dynamic chain COUNT
383 times to get the address of either a higher stack frame, or a return
384 address located within it (depending on FNDECL_CODE). */
387 expand_builtin_return_addr (fndecl_code
, count
, tem
)
388 enum built_in_function fndecl_code
;
394 /* Some machines need special handling before we can access
395 arbitrary frames. For example, on the sparc, we must first flush
396 all register windows to the stack. */
397 #ifdef SETUP_FRAME_ADDRESSES
399 SETUP_FRAME_ADDRESSES ();
402 /* On the sparc, the return address is not in the frame, it is in a
403 register. There is no way to access it off of the current frame
404 pointer, but it can be accessed off the previous frame pointer by
405 reading the value from the register window save area. */
406 #ifdef RETURN_ADDR_IN_PREVIOUS_FRAME
407 if (fndecl_code
== BUILT_IN_RETURN_ADDRESS
)
411 /* Scan back COUNT frames to the specified frame. */
412 for (i
= 0; i
< count
; i
++)
414 /* Assume the dynamic chain pointer is in the word that the
415 frame address points to, unless otherwise specified. */
416 #ifdef DYNAMIC_CHAIN_ADDRESS
417 tem
= DYNAMIC_CHAIN_ADDRESS (tem
);
419 tem
= memory_address (Pmode
, tem
);
420 tem
= gen_rtx_MEM (Pmode
, tem
);
421 set_mem_alias_set (tem
, get_frame_alias_set ());
422 tem
= copy_to_reg (tem
);
425 /* For __builtin_frame_address, return what we've got. */
426 if (fndecl_code
== BUILT_IN_FRAME_ADDRESS
)
429 /* For __builtin_return_address, Get the return address from that
431 #ifdef RETURN_ADDR_RTX
432 tem
= RETURN_ADDR_RTX (count
, tem
);
434 tem
= memory_address (Pmode
,
435 plus_constant (tem
, GET_MODE_SIZE (Pmode
)));
436 tem
= gen_rtx_MEM (Pmode
, tem
);
437 set_mem_alias_set (tem
, get_frame_alias_set ());
442 /* Alias set used for setjmp buffer. */
443 static HOST_WIDE_INT setjmp_alias_set
= -1;
445 /* Construct the leading half of a __builtin_setjmp call. Control will
446 return to RECEIVER_LABEL. This is used directly by sjlj exception
450 expand_builtin_setjmp_setup (buf_addr
, receiver_label
)
454 enum machine_mode sa_mode
= STACK_SAVEAREA_MODE (SAVE_NONLOCAL
);
458 if (setjmp_alias_set
== -1)
459 setjmp_alias_set
= new_alias_set ();
461 #ifdef POINTERS_EXTEND_UNSIGNED
462 if (GET_MODE (buf_addr
) != Pmode
)
463 buf_addr
= convert_memory_address (Pmode
, buf_addr
);
466 buf_addr
= force_reg (Pmode
, force_operand (buf_addr
, NULL_RTX
));
470 /* We store the frame pointer and the address of receiver_label in
471 the buffer and use the rest of it for the stack save area, which
472 is machine-dependent. */
474 #ifndef BUILTIN_SETJMP_FRAME_VALUE
475 #define BUILTIN_SETJMP_FRAME_VALUE virtual_stack_vars_rtx
478 mem
= gen_rtx_MEM (Pmode
, buf_addr
);
479 set_mem_alias_set (mem
, setjmp_alias_set
);
480 emit_move_insn (mem
, BUILTIN_SETJMP_FRAME_VALUE
);
482 mem
= gen_rtx_MEM (Pmode
, plus_constant (buf_addr
, GET_MODE_SIZE (Pmode
))),
483 set_mem_alias_set (mem
, setjmp_alias_set
);
485 emit_move_insn (validize_mem (mem
),
486 force_reg (Pmode
, gen_rtx_LABEL_REF (Pmode
, receiver_label
)));
488 stack_save
= gen_rtx_MEM (sa_mode
,
489 plus_constant (buf_addr
,
490 2 * GET_MODE_SIZE (Pmode
)));
491 set_mem_alias_set (stack_save
, setjmp_alias_set
);
492 emit_stack_save (SAVE_NONLOCAL
, &stack_save
, NULL_RTX
);
494 /* If there is further processing to do, do it. */
495 #ifdef HAVE_builtin_setjmp_setup
496 if (HAVE_builtin_setjmp_setup
)
497 emit_insn (gen_builtin_setjmp_setup (buf_addr
));
500 /* Tell optimize_save_area_alloca that extra work is going to
501 need to go on during alloca. */
502 current_function_calls_setjmp
= 1;
504 /* Set this so all the registers get saved in our frame; we need to be
505 able to copy the saved values for any registers from frames we unwind. */
506 current_function_has_nonlocal_label
= 1;
509 /* Construct the trailing part of a __builtin_setjmp call.
510 This is used directly by sjlj exception handling code. */
513 expand_builtin_setjmp_receiver (receiver_label
)
514 rtx receiver_label ATTRIBUTE_UNUSED
;
516 /* Clobber the FP when we get here, so we have to make sure it's
517 marked as used by this function. */
518 emit_insn (gen_rtx_USE (VOIDmode
, hard_frame_pointer_rtx
));
520 /* Mark the static chain as clobbered here so life information
521 doesn't get messed up for it. */
522 emit_insn (gen_rtx_CLOBBER (VOIDmode
, static_chain_rtx
));
524 /* Now put in the code to restore the frame pointer, and argument
525 pointer, if needed. The code below is from expand_end_bindings
526 in stmt.c; see detailed documentation there. */
527 #ifdef HAVE_nonlocal_goto
528 if (! HAVE_nonlocal_goto
)
530 emit_move_insn (virtual_stack_vars_rtx
, hard_frame_pointer_rtx
);
532 #if ARG_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM
533 if (fixed_regs
[ARG_POINTER_REGNUM
])
535 #ifdef ELIMINABLE_REGS
537 static const struct elims
{const int from
, to
;} elim_regs
[] = ELIMINABLE_REGS
;
539 for (i
= 0; i
< ARRAY_SIZE (elim_regs
); i
++)
540 if (elim_regs
[i
].from
== ARG_POINTER_REGNUM
541 && elim_regs
[i
].to
== HARD_FRAME_POINTER_REGNUM
)
544 if (i
== ARRAY_SIZE (elim_regs
))
547 /* Now restore our arg pointer from the address at which it
548 was saved in our stack frame. */
549 emit_move_insn (virtual_incoming_args_rtx
,
550 copy_to_reg (get_arg_pointer_save_area (cfun
)));
555 #ifdef HAVE_builtin_setjmp_receiver
556 if (HAVE_builtin_setjmp_receiver
)
557 emit_insn (gen_builtin_setjmp_receiver (receiver_label
));
560 #ifdef HAVE_nonlocal_goto_receiver
561 if (HAVE_nonlocal_goto_receiver
)
562 emit_insn (gen_nonlocal_goto_receiver ());
567 /* @@@ This is a kludge. Not all machine descriptions define a blockage
568 insn, but we must not allow the code we just generated to be reordered
569 by scheduling. Specifically, the update of the frame pointer must
570 happen immediately, not later. So emit an ASM_INPUT to act as blockage
572 emit_insn (gen_rtx_ASM_INPUT (VOIDmode
, ""));
575 /* __builtin_setjmp is passed a pointer to an array of five words (not
576 all will be used on all machines). It operates similarly to the C
577 library function of the same name, but is more efficient. Much of
578 the code below (and for longjmp) is copied from the handling of
581 NOTE: This is intended for use by GNAT and the exception handling
582 scheme in the compiler and will only work in the method used by
586 expand_builtin_setjmp (arglist
, target
)
590 rtx buf_addr
, next_lab
, cont_lab
;
592 if (!validate_arglist (arglist
, POINTER_TYPE
, VOID_TYPE
))
595 if (target
== 0 || GET_CODE (target
) != REG
596 || REGNO (target
) < FIRST_PSEUDO_REGISTER
)
597 target
= gen_reg_rtx (TYPE_MODE (integer_type_node
));
599 buf_addr
= expand_expr (TREE_VALUE (arglist
), NULL_RTX
, VOIDmode
, 0);
601 next_lab
= gen_label_rtx ();
602 cont_lab
= gen_label_rtx ();
604 expand_builtin_setjmp_setup (buf_addr
, next_lab
);
606 /* Set TARGET to zero and branch to the continue label. */
607 emit_move_insn (target
, const0_rtx
);
608 emit_jump_insn (gen_jump (cont_lab
));
610 emit_label (next_lab
);
612 expand_builtin_setjmp_receiver (next_lab
);
614 /* Set TARGET to one. */
615 emit_move_insn (target
, const1_rtx
);
616 emit_label (cont_lab
);
618 /* Tell flow about the strange goings on. Putting `next_lab' on
619 `nonlocal_goto_handler_labels' to indicates that function
620 calls may traverse the arc back to this label. */
622 current_function_has_nonlocal_label
= 1;
623 nonlocal_goto_handler_labels
624 = gen_rtx_EXPR_LIST (VOIDmode
, next_lab
, nonlocal_goto_handler_labels
);
629 /* __builtin_longjmp is passed a pointer to an array of five words (not
630 all will be used on all machines). It operates similarly to the C
631 library function of the same name, but is more efficient. Much of
632 the code below is copied from the handling of non-local gotos.
634 NOTE: This is intended for use by GNAT and the exception handling
635 scheme in the compiler and will only work in the method used by
639 expand_builtin_longjmp (buf_addr
, value
)
642 rtx fp
, lab
, stack
, insn
;
643 enum machine_mode sa_mode
= STACK_SAVEAREA_MODE (SAVE_NONLOCAL
);
645 if (setjmp_alias_set
== -1)
646 setjmp_alias_set
= new_alias_set ();
648 #ifdef POINTERS_EXTEND_UNSIGNED
649 if (GET_MODE (buf_addr
) != Pmode
)
650 buf_addr
= convert_memory_address (Pmode
, buf_addr
);
653 buf_addr
= force_reg (Pmode
, buf_addr
);
655 /* We used to store value in static_chain_rtx, but that fails if pointers
656 are smaller than integers. We instead require that the user must pass
657 a second argument of 1, because that is what builtin_setjmp will
658 return. This also makes EH slightly more efficient, since we are no
659 longer copying around a value that we don't care about. */
660 if (value
!= const1_rtx
)
663 current_function_calls_longjmp
= 1;
665 #ifdef HAVE_builtin_longjmp
666 if (HAVE_builtin_longjmp
)
667 emit_insn (gen_builtin_longjmp (buf_addr
));
671 fp
= gen_rtx_MEM (Pmode
, buf_addr
);
672 lab
= gen_rtx_MEM (Pmode
, plus_constant (buf_addr
,
673 GET_MODE_SIZE (Pmode
)));
675 stack
= gen_rtx_MEM (sa_mode
, plus_constant (buf_addr
,
676 2 * GET_MODE_SIZE (Pmode
)));
677 set_mem_alias_set (fp
, setjmp_alias_set
);
678 set_mem_alias_set (lab
, setjmp_alias_set
);
679 set_mem_alias_set (stack
, setjmp_alias_set
);
681 /* Pick up FP, label, and SP from the block and jump. This code is
682 from expand_goto in stmt.c; see there for detailed comments. */
683 #if HAVE_nonlocal_goto
684 if (HAVE_nonlocal_goto
)
685 /* We have to pass a value to the nonlocal_goto pattern that will
686 get copied into the static_chain pointer, but it does not matter
687 what that value is, because builtin_setjmp does not use it. */
688 emit_insn (gen_nonlocal_goto (value
, lab
, stack
, fp
));
692 lab
= copy_to_reg (lab
);
694 emit_move_insn (hard_frame_pointer_rtx
, fp
);
695 emit_stack_restore (SAVE_NONLOCAL
, stack
, NULL_RTX
);
697 emit_insn (gen_rtx_USE (VOIDmode
, hard_frame_pointer_rtx
));
698 emit_insn (gen_rtx_USE (VOIDmode
, stack_pointer_rtx
));
699 emit_indirect_jump (lab
);
703 /* Search backwards and mark the jump insn as a non-local goto.
704 Note that this precludes the use of __builtin_longjmp to a
705 __builtin_setjmp target in the same function. However, we've
706 already cautioned the user that these functions are for
707 internal exception handling use only. */
708 for (insn
= get_last_insn (); insn
; insn
= PREV_INSN (insn
))
710 if (GET_CODE (insn
) == JUMP_INSN
)
712 REG_NOTES (insn
) = alloc_EXPR_LIST (REG_NON_LOCAL_GOTO
, const0_rtx
,
716 else if (GET_CODE (insn
) == CALL_INSN
)
721 /* Expand a call to __builtin_prefetch. For a target that does not support
722 data prefetch, evaluate the memory address argument in case it has side
726 expand_builtin_prefetch (arglist
)
729 tree arg0
, arg1
, arg2
;
732 if (!validate_arglist (arglist
, POINTER_TYPE
, 0))
735 arg0
= TREE_VALUE (arglist
);
736 /* Arguments 1 and 2 are optional; argument 1 (read/write) defaults to
737 zero (read) and argument 2 (locality) defaults to 3 (high degree of
739 if (TREE_CHAIN (arglist
))
741 arg1
= TREE_VALUE (TREE_CHAIN (arglist
));
742 if (TREE_CHAIN (TREE_CHAIN (arglist
)))
743 arg2
= TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist
)));
745 arg2
= build_int_2 (3, 0);
749 arg1
= integer_zero_node
;
750 arg2
= build_int_2 (3, 0);
753 /* Argument 0 is an address. */
754 op0
= expand_expr (arg0
, NULL_RTX
, Pmode
, EXPAND_NORMAL
);
756 /* Argument 1 (read/write flag) must be a compile-time constant int. */
757 if (TREE_CODE (arg1
) != INTEGER_CST
)
759 error ("second arg to `__builtin_prefetch' must be a constant");
760 arg1
= integer_zero_node
;
762 op1
= expand_expr (arg1
, NULL_RTX
, VOIDmode
, 0);
763 /* Argument 1 must be either zero or one. */
764 if (INTVAL (op1
) != 0 && INTVAL (op1
) != 1)
766 warning ("invalid second arg to __builtin_prefetch; using zero");
770 /* Argument 2 (locality) must be a compile-time constant int. */
771 if (TREE_CODE (arg2
) != INTEGER_CST
)
773 error ("third arg to `__builtin_prefetch' must be a constant");
774 arg2
= integer_zero_node
;
776 op2
= expand_expr (arg2
, NULL_RTX
, VOIDmode
, 0);
777 /* Argument 2 must be 0, 1, 2, or 3. */
778 if (INTVAL (op2
) < 0 || INTVAL (op2
) > 3)
780 warning ("invalid third arg to __builtin_prefetch; using zero");
787 if (! (*insn_data
[(int)CODE_FOR_prefetch
].operand
[0].predicate
)
789 insn_data
[(int)CODE_FOR_prefetch
].operand
[0].mode
))
790 op0
= force_reg (Pmode
, op0
);
791 emit_insn (gen_prefetch (op0
, op1
, op2
));
795 op0
= protect_from_queue (op0
, 0);
796 /* Don't do anything with direct references to volatile memory, but
797 generate code to handle other side effects. */
798 if (GET_CODE (op0
) != MEM
&& side_effects_p (op0
))
802 /* Get a MEM rtx for expression EXP which is the address of an operand
803 to be used to be used in a string instruction (cmpstrsi, movstrsi, ..). */
809 rtx addr
= expand_expr (exp
, NULL_RTX
, ptr_mode
, EXPAND_SUM
);
812 #ifdef POINTERS_EXTEND_UNSIGNED
813 if (GET_MODE (addr
) != Pmode
)
814 addr
= convert_memory_address (Pmode
, addr
);
817 mem
= gen_rtx_MEM (BLKmode
, memory_address (BLKmode
, addr
));
819 /* Get an expression we can use to find the attributes to assign to MEM.
820 If it is an ADDR_EXPR, use the operand. Otherwise, dereference it if
821 we can. First remove any nops. */
822 while ((TREE_CODE (exp
) == NOP_EXPR
|| TREE_CODE (exp
) == CONVERT_EXPR
823 || TREE_CODE (exp
) == NON_LVALUE_EXPR
)
824 && POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (exp
, 0))))
825 exp
= TREE_OPERAND (exp
, 0);
827 if (TREE_CODE (exp
) == ADDR_EXPR
)
829 exp
= TREE_OPERAND (exp
, 0);
830 set_mem_attributes (mem
, exp
, 0);
832 else if (POINTER_TYPE_P (TREE_TYPE (exp
)))
834 exp
= build1 (INDIRECT_REF
, TREE_TYPE (TREE_TYPE (exp
)), exp
);
835 /* memcpy, memset and other builtin stringops can alias with anything. */
836 set_mem_alias_set (mem
, 0);
842 /* Built-in functions to perform an untyped call and return. */
844 /* For each register that may be used for calling a function, this
845 gives a mode used to copy the register's value. VOIDmode indicates
846 the register is not used for calling a function. If the machine
847 has register windows, this gives only the outbound registers.
848 INCOMING_REGNO gives the corresponding inbound register. */
849 static enum machine_mode apply_args_mode
[FIRST_PSEUDO_REGISTER
];
851 /* For each register that may be used for returning values, this gives
852 a mode used to copy the register's value. VOIDmode indicates the
853 register is not used for returning values. If the machine has
854 register windows, this gives only the outbound registers.
855 INCOMING_REGNO gives the corresponding inbound register. */
856 static enum machine_mode apply_result_mode
[FIRST_PSEUDO_REGISTER
];
858 /* For each register that may be used for calling a function, this
859 gives the offset of that register into the block returned by
860 __builtin_apply_args. 0 indicates that the register is not
861 used for calling a function. */
862 static int apply_args_reg_offset
[FIRST_PSEUDO_REGISTER
];
864 /* Return the offset of register REGNO into the block returned by
865 __builtin_apply_args. This is not declared static, since it is
866 needed in objc-act.c. */
869 apply_args_register_offset (regno
)
874 /* Arguments are always put in outgoing registers (in the argument
875 block) if such make sense. */
876 #ifdef OUTGOING_REGNO
877 regno
= OUTGOING_REGNO(regno
);
879 return apply_args_reg_offset
[regno
];
882 /* Return the size required for the block returned by __builtin_apply_args,
883 and initialize apply_args_mode. */
888 static int size
= -1;
891 enum machine_mode mode
;
893 /* The values computed by this function never change. */
896 /* The first value is the incoming arg-pointer. */
897 size
= GET_MODE_SIZE (Pmode
);
899 /* The second value is the structure value address unless this is
900 passed as an "invisible" first argument. */
901 if (struct_value_rtx
)
902 size
+= GET_MODE_SIZE (Pmode
);
904 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
905 if (FUNCTION_ARG_REGNO_P (regno
))
907 /* Search for the proper mode for copying this register's
908 value. I'm not sure this is right, but it works so far. */
909 enum machine_mode best_mode
= VOIDmode
;
911 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_INT
);
913 mode
= GET_MODE_WIDER_MODE (mode
))
914 if (HARD_REGNO_MODE_OK (regno
, mode
)
915 && HARD_REGNO_NREGS (regno
, mode
) == 1)
918 if (best_mode
== VOIDmode
)
919 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_FLOAT
);
921 mode
= GET_MODE_WIDER_MODE (mode
))
922 if (HARD_REGNO_MODE_OK (regno
, mode
)
923 && have_insn_for (SET
, mode
))
926 if (best_mode
== VOIDmode
)
927 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_VECTOR_FLOAT
);
929 mode
= GET_MODE_WIDER_MODE (mode
))
930 if (HARD_REGNO_MODE_OK (regno
, mode
)
931 && have_insn_for (SET
, mode
))
934 if (best_mode
== VOIDmode
)
935 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_VECTOR_INT
);
937 mode
= GET_MODE_WIDER_MODE (mode
))
938 if (HARD_REGNO_MODE_OK (regno
, mode
)
939 && have_insn_for (SET
, mode
))
943 if (mode
== VOIDmode
)
946 align
= GET_MODE_ALIGNMENT (mode
) / BITS_PER_UNIT
;
947 if (size
% align
!= 0)
948 size
= CEIL (size
, align
) * align
;
949 apply_args_reg_offset
[regno
] = size
;
950 size
+= GET_MODE_SIZE (mode
);
951 apply_args_mode
[regno
] = mode
;
955 apply_args_mode
[regno
] = VOIDmode
;
956 apply_args_reg_offset
[regno
] = 0;
962 /* Return the size required for the block returned by __builtin_apply,
963 and initialize apply_result_mode. */
968 static int size
= -1;
970 enum machine_mode mode
;
972 /* The values computed by this function never change. */
977 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
978 if (FUNCTION_VALUE_REGNO_P (regno
))
980 /* Search for the proper mode for copying this register's
981 value. I'm not sure this is right, but it works so far. */
982 enum machine_mode best_mode
= VOIDmode
;
984 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_INT
);
986 mode
= GET_MODE_WIDER_MODE (mode
))
987 if (HARD_REGNO_MODE_OK (regno
, mode
))
990 if (best_mode
== VOIDmode
)
991 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_FLOAT
);
993 mode
= GET_MODE_WIDER_MODE (mode
))
994 if (HARD_REGNO_MODE_OK (regno
, mode
)
995 && have_insn_for (SET
, mode
))
998 if (best_mode
== VOIDmode
)
999 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_VECTOR_FLOAT
);
1001 mode
= GET_MODE_WIDER_MODE (mode
))
1002 if (HARD_REGNO_MODE_OK (regno
, mode
)
1003 && have_insn_for (SET
, mode
))
1006 if (best_mode
== VOIDmode
)
1007 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_VECTOR_INT
);
1009 mode
= GET_MODE_WIDER_MODE (mode
))
1010 if (HARD_REGNO_MODE_OK (regno
, mode
)
1011 && have_insn_for (SET
, mode
))
1015 if (mode
== VOIDmode
)
1018 align
= GET_MODE_ALIGNMENT (mode
) / BITS_PER_UNIT
;
1019 if (size
% align
!= 0)
1020 size
= CEIL (size
, align
) * align
;
1021 size
+= GET_MODE_SIZE (mode
);
1022 apply_result_mode
[regno
] = mode
;
1025 apply_result_mode
[regno
] = VOIDmode
;
1027 /* Allow targets that use untyped_call and untyped_return to override
1028 the size so that machine-specific information can be stored here. */
1029 #ifdef APPLY_RESULT_SIZE
1030 size
= APPLY_RESULT_SIZE
;
1036 #if defined (HAVE_untyped_call) || defined (HAVE_untyped_return)
1037 /* Create a vector describing the result block RESULT. If SAVEP is true,
1038 the result block is used to save the values; otherwise it is used to
1039 restore the values. */
1042 result_vector (savep
, result
)
1046 int regno
, size
, align
, nelts
;
1047 enum machine_mode mode
;
1049 rtx
*savevec
= (rtx
*) alloca (FIRST_PSEUDO_REGISTER
* sizeof (rtx
));
1052 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
1053 if ((mode
= apply_result_mode
[regno
]) != VOIDmode
)
1055 align
= GET_MODE_ALIGNMENT (mode
) / BITS_PER_UNIT
;
1056 if (size
% align
!= 0)
1057 size
= CEIL (size
, align
) * align
;
1058 reg
= gen_rtx_REG (mode
, savep
? regno
: INCOMING_REGNO (regno
));
1059 mem
= adjust_address (result
, mode
, size
);
1060 savevec
[nelts
++] = (savep
1061 ? gen_rtx_SET (VOIDmode
, mem
, reg
)
1062 : gen_rtx_SET (VOIDmode
, reg
, mem
));
1063 size
+= GET_MODE_SIZE (mode
);
1065 return gen_rtx_PARALLEL (VOIDmode
, gen_rtvec_v (nelts
, savevec
));
1067 #endif /* HAVE_untyped_call or HAVE_untyped_return */
1069 /* Save the state required to perform an untyped call with the same
1070 arguments as were passed to the current function. */
1073 expand_builtin_apply_args_1 ()
1076 int size
, align
, regno
;
1077 enum machine_mode mode
;
1079 /* Create a block where the arg-pointer, structure value address,
1080 and argument registers can be saved. */
1081 registers
= assign_stack_local (BLKmode
, apply_args_size (), -1);
1083 /* Walk past the arg-pointer and structure value address. */
1084 size
= GET_MODE_SIZE (Pmode
);
1085 if (struct_value_rtx
)
1086 size
+= GET_MODE_SIZE (Pmode
);
1088 /* Save each register used in calling a function to the block. */
1089 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
1090 if ((mode
= apply_args_mode
[regno
]) != VOIDmode
)
1094 align
= GET_MODE_ALIGNMENT (mode
) / BITS_PER_UNIT
;
1095 if (size
% align
!= 0)
1096 size
= CEIL (size
, align
) * align
;
1098 tem
= gen_rtx_REG (mode
, INCOMING_REGNO (regno
));
1100 emit_move_insn (adjust_address (registers
, mode
, size
), tem
);
1101 size
+= GET_MODE_SIZE (mode
);
1104 /* Save the arg pointer to the block. */
1105 emit_move_insn (adjust_address (registers
, Pmode
, 0),
1106 copy_to_reg (virtual_incoming_args_rtx
));
1107 size
= GET_MODE_SIZE (Pmode
);
1109 /* Save the structure value address unless this is passed as an
1110 "invisible" first argument. */
1111 if (struct_value_incoming_rtx
)
1113 emit_move_insn (adjust_address (registers
, Pmode
, size
),
1114 copy_to_reg (struct_value_incoming_rtx
));
1115 size
+= GET_MODE_SIZE (Pmode
);
1118 /* Return the address of the block. */
1119 return copy_addr_to_reg (XEXP (registers
, 0));
1122 /* __builtin_apply_args returns block of memory allocated on
1123 the stack into which is stored the arg pointer, structure
1124 value address, static chain, and all the registers that might
1125 possibly be used in performing a function call. The code is
1126 moved to the start of the function so the incoming values are
1130 expand_builtin_apply_args ()
1132 /* Don't do __builtin_apply_args more than once in a function.
1133 Save the result of the first call and reuse it. */
1134 if (apply_args_value
!= 0)
1135 return apply_args_value
;
1137 /* When this function is called, it means that registers must be
1138 saved on entry to this function. So we migrate the
1139 call to the first insn of this function. */
1144 temp
= expand_builtin_apply_args_1 ();
1148 apply_args_value
= temp
;
1150 /* Put the sequence after the NOTE that starts the function.
1151 If this is inside a SEQUENCE, make the outer-level insn
1152 chain current, so the code is placed at the start of the
1154 push_topmost_sequence ();
1155 emit_insns_before (seq
, NEXT_INSN (get_insns ()));
1156 pop_topmost_sequence ();
1161 /* Perform an untyped call and save the state required to perform an
1162 untyped return of whatever value was returned by the given function. */
1165 expand_builtin_apply (function
, arguments
, argsize
)
1166 rtx function
, arguments
, argsize
;
1168 int size
, align
, regno
;
1169 enum machine_mode mode
;
1170 rtx incoming_args
, result
, reg
, dest
, src
, call_insn
;
1171 rtx old_stack_level
= 0;
1172 rtx call_fusage
= 0;
1174 #ifdef POINTERS_EXTEND_UNSIGNED
1175 if (GET_MODE (arguments
) != Pmode
)
1176 arguments
= convert_memory_address (Pmode
, arguments
);
1179 /* Create a block where the return registers can be saved. */
1180 result
= assign_stack_local (BLKmode
, apply_result_size (), -1);
1182 /* Fetch the arg pointer from the ARGUMENTS block. */
1183 incoming_args
= gen_reg_rtx (Pmode
);
1184 emit_move_insn (incoming_args
, gen_rtx_MEM (Pmode
, arguments
));
1185 #ifndef STACK_GROWS_DOWNWARD
1186 incoming_args
= expand_simple_binop (Pmode
, MINUS
, incoming_args
, argsize
,
1187 incoming_args
, 0, OPTAB_LIB_WIDEN
);
1190 /* Perform postincrements before actually calling the function. */
1193 /* Push a new argument block and copy the arguments. Do not allow
1194 the (potential) memcpy call below to interfere with our stack
1196 do_pending_stack_adjust ();
1199 /* Save the stack with nonlocal if available */
1200 #ifdef HAVE_save_stack_nonlocal
1201 if (HAVE_save_stack_nonlocal
)
1202 emit_stack_save (SAVE_NONLOCAL
, &old_stack_level
, NULL_RTX
);
1205 emit_stack_save (SAVE_BLOCK
, &old_stack_level
, NULL_RTX
);
1207 /* Push a block of memory onto the stack to store the memory arguments.
1208 Save the address in a register, and copy the memory arguments. ??? I
1209 haven't figured out how the calling convention macros effect this,
1210 but it's likely that the source and/or destination addresses in
1211 the block copy will need updating in machine specific ways. */
1212 dest
= allocate_dynamic_stack_space (argsize
, 0, BITS_PER_UNIT
);
1213 dest
= gen_rtx_MEM (BLKmode
, dest
);
1214 set_mem_align (dest
, PARM_BOUNDARY
);
1215 src
= gen_rtx_MEM (BLKmode
, incoming_args
);
1216 set_mem_align (src
, PARM_BOUNDARY
);
1217 emit_block_move (dest
, src
, argsize
);
1219 /* Refer to the argument block. */
1221 arguments
= gen_rtx_MEM (BLKmode
, arguments
);
1222 set_mem_align (arguments
, PARM_BOUNDARY
);
1224 /* Walk past the arg-pointer and structure value address. */
1225 size
= GET_MODE_SIZE (Pmode
);
1226 if (struct_value_rtx
)
1227 size
+= GET_MODE_SIZE (Pmode
);
1229 /* Restore each of the registers previously saved. Make USE insns
1230 for each of these registers for use in making the call. */
1231 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
1232 if ((mode
= apply_args_mode
[regno
]) != VOIDmode
)
1234 align
= GET_MODE_ALIGNMENT (mode
) / BITS_PER_UNIT
;
1235 if (size
% align
!= 0)
1236 size
= CEIL (size
, align
) * align
;
1237 reg
= gen_rtx_REG (mode
, regno
);
1238 emit_move_insn (reg
, adjust_address (arguments
, mode
, size
));
1239 use_reg (&call_fusage
, reg
);
1240 size
+= GET_MODE_SIZE (mode
);
1243 /* Restore the structure value address unless this is passed as an
1244 "invisible" first argument. */
1245 size
= GET_MODE_SIZE (Pmode
);
1246 if (struct_value_rtx
)
1248 rtx value
= gen_reg_rtx (Pmode
);
1249 emit_move_insn (value
, adjust_address (arguments
, Pmode
, size
));
1250 emit_move_insn (struct_value_rtx
, value
);
1251 if (GET_CODE (struct_value_rtx
) == REG
)
1252 use_reg (&call_fusage
, struct_value_rtx
);
1253 size
+= GET_MODE_SIZE (Pmode
);
1256 /* All arguments and registers used for the call are set up by now! */
1257 function
= prepare_call_address (function
, NULL_TREE
, &call_fusage
, 0, 0);
1259 /* Ensure address is valid. SYMBOL_REF is already valid, so no need,
1260 and we don't want to load it into a register as an optimization,
1261 because prepare_call_address already did it if it should be done. */
1262 if (GET_CODE (function
) != SYMBOL_REF
)
1263 function
= memory_address (FUNCTION_MODE
, function
);
1265 /* Generate the actual call instruction and save the return value. */
1266 #ifdef HAVE_untyped_call
1267 if (HAVE_untyped_call
)
1268 emit_call_insn (gen_untyped_call (gen_rtx_MEM (FUNCTION_MODE
, function
),
1269 result
, result_vector (1, result
)));
1272 #ifdef HAVE_call_value
1273 if (HAVE_call_value
)
1277 /* Locate the unique return register. It is not possible to
1278 express a call that sets more than one return register using
1279 call_value; use untyped_call for that. In fact, untyped_call
1280 only needs to save the return registers in the given block. */
1281 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
1282 if ((mode
= apply_result_mode
[regno
]) != VOIDmode
)
1285 abort (); /* HAVE_untyped_call required. */
1286 valreg
= gen_rtx_REG (mode
, regno
);
1289 emit_call_insn (GEN_CALL_VALUE (valreg
,
1290 gen_rtx_MEM (FUNCTION_MODE
, function
),
1291 const0_rtx
, NULL_RTX
, const0_rtx
));
1293 emit_move_insn (adjust_address (result
, GET_MODE (valreg
), 0), valreg
);
1299 /* Find the CALL insn we just emitted. */
1300 for (call_insn
= get_last_insn ();
1301 call_insn
&& GET_CODE (call_insn
) != CALL_INSN
;
1302 call_insn
= PREV_INSN (call_insn
))
1308 /* Put the register usage information on the CALL. If there is already
1309 some usage information, put ours at the end. */
1310 if (CALL_INSN_FUNCTION_USAGE (call_insn
))
1314 for (link
= CALL_INSN_FUNCTION_USAGE (call_insn
); XEXP (link
, 1) != 0;
1315 link
= XEXP (link
, 1))
1318 XEXP (link
, 1) = call_fusage
;
1321 CALL_INSN_FUNCTION_USAGE (call_insn
) = call_fusage
;
1323 /* Restore the stack. */
1324 #ifdef HAVE_save_stack_nonlocal
1325 if (HAVE_save_stack_nonlocal
)
1326 emit_stack_restore (SAVE_NONLOCAL
, old_stack_level
, NULL_RTX
);
1329 emit_stack_restore (SAVE_BLOCK
, old_stack_level
, NULL_RTX
);
1333 /* Return the address of the result block. */
1334 return copy_addr_to_reg (XEXP (result
, 0));
1337 /* Perform an untyped return. */
1340 expand_builtin_return (result
)
1343 int size
, align
, regno
;
1344 enum machine_mode mode
;
1346 rtx call_fusage
= 0;
1348 #ifdef POINTERS_EXTEND_UNSIGNED
1349 if (GET_MODE (result
) != Pmode
)
1350 result
= convert_memory_address (Pmode
, result
);
1353 apply_result_size ();
1354 result
= gen_rtx_MEM (BLKmode
, result
);
1356 #ifdef HAVE_untyped_return
1357 if (HAVE_untyped_return
)
1359 emit_jump_insn (gen_untyped_return (result
, result_vector (0, result
)));
1365 /* Restore the return value and note that each value is used. */
1367 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
1368 if ((mode
= apply_result_mode
[regno
]) != VOIDmode
)
1370 align
= GET_MODE_ALIGNMENT (mode
) / BITS_PER_UNIT
;
1371 if (size
% align
!= 0)
1372 size
= CEIL (size
, align
) * align
;
1373 reg
= gen_rtx_REG (mode
, INCOMING_REGNO (regno
));
1374 emit_move_insn (reg
, adjust_address (result
, mode
, size
));
1376 push_to_sequence (call_fusage
);
1377 emit_insn (gen_rtx_USE (VOIDmode
, reg
));
1378 call_fusage
= get_insns ();
1380 size
+= GET_MODE_SIZE (mode
);
1383 /* Put the USE insns before the return. */
1384 emit_insns (call_fusage
);
1386 /* Return whatever values was restored by jumping directly to the end
1388 expand_null_return ();
1391 /* Used by expand_builtin_classify_type and fold_builtin_classify_type. */
1393 static enum type_class
1394 type_to_class (type
)
1397 switch (TREE_CODE (type
))
1399 case VOID_TYPE
: return void_type_class
;
1400 case INTEGER_TYPE
: return integer_type_class
;
1401 case CHAR_TYPE
: return char_type_class
;
1402 case ENUMERAL_TYPE
: return enumeral_type_class
;
1403 case BOOLEAN_TYPE
: return boolean_type_class
;
1404 case POINTER_TYPE
: return pointer_type_class
;
1405 case REFERENCE_TYPE
: return reference_type_class
;
1406 case OFFSET_TYPE
: return offset_type_class
;
1407 case REAL_TYPE
: return real_type_class
;
1408 case COMPLEX_TYPE
: return complex_type_class
;
1409 case FUNCTION_TYPE
: return function_type_class
;
1410 case METHOD_TYPE
: return method_type_class
;
1411 case RECORD_TYPE
: return record_type_class
;
1413 case QUAL_UNION_TYPE
: return union_type_class
;
1414 case ARRAY_TYPE
: return (TYPE_STRING_FLAG (type
)
1415 ? string_type_class
: array_type_class
);
1416 case SET_TYPE
: return set_type_class
;
1417 case FILE_TYPE
: return file_type_class
;
1418 case LANG_TYPE
: return lang_type_class
;
1419 default: return no_type_class
;
1423 /* Expand a call to __builtin_classify_type with arguments found in
1427 expand_builtin_classify_type (arglist
)
1431 return GEN_INT (type_to_class (TREE_TYPE (TREE_VALUE (arglist
))));
1432 return GEN_INT (no_type_class
);
1435 /* Expand expression EXP, which is a call to __builtin_constant_p. */
1438 expand_builtin_constant_p (exp
)
1441 tree arglist
= TREE_OPERAND (exp
, 1);
1442 enum machine_mode value_mode
= TYPE_MODE (TREE_TYPE (exp
));
1447 arglist
= TREE_VALUE (arglist
);
1449 /* We have taken care of the easy cases during constant folding. This
1450 case is not obvious, so emit (constant_p_rtx (ARGLIST)) and let CSE get a
1451 chance to see if it can deduce whether ARGLIST is constant. */
1453 tmp
= expand_expr (arglist
, NULL_RTX
, VOIDmode
, 0);
1454 tmp
= gen_rtx_CONSTANT_P_RTX (value_mode
, tmp
);
1458 /* Expand a call to one of the builtin math functions (sin, cos, or sqrt).
1459 Return 0 if a normal call should be emitted rather than expanding the
1460 function in-line. EXP is the expression that is a call to the builtin
1461 function; if convenient, the result should be placed in TARGET.
1462 SUBTARGET may be used as the target for computing one of EXP's operands. */
1465 expand_builtin_mathfn (exp
, target
, subtarget
)
1467 rtx target
, subtarget
;
1469 optab builtin_optab
;
1471 tree fndecl
= TREE_OPERAND (TREE_OPERAND (exp
, 0), 0);
1472 tree arglist
= TREE_OPERAND (exp
, 1);
1474 if (!validate_arglist (arglist
, REAL_TYPE
, VOID_TYPE
))
1477 /* Stabilize and compute the argument. */
1478 if (TREE_CODE (TREE_VALUE (arglist
)) != VAR_DECL
1479 && TREE_CODE (TREE_VALUE (arglist
)) != PARM_DECL
)
1481 exp
= copy_node (exp
);
1482 TREE_OPERAND (exp
, 1) = arglist
;
1483 /* Wrap the computation of the argument in a SAVE_EXPR. That
1484 way, if we need to expand the argument again (as in the
1485 flag_errno_math case below where we cannot directly set
1486 errno), we will not perform side-effects more than once.
1487 Note that here we're mutating the original EXP as well as the
1488 copy; that's the right thing to do in case the original EXP
1489 is expanded later. */
1490 TREE_VALUE (arglist
) = save_expr (TREE_VALUE (arglist
));
1491 arglist
= copy_node (arglist
);
1493 op0
= expand_expr (TREE_VALUE (arglist
), subtarget
, VOIDmode
, 0);
1495 /* Make a suitable register to place result in. */
1496 target
= gen_reg_rtx (TYPE_MODE (TREE_TYPE (exp
)));
1501 switch (DECL_FUNCTION_CODE (fndecl
))
1506 builtin_optab
= sin_optab
; break;
1510 builtin_optab
= cos_optab
; break;
1512 case BUILT_IN_SQRTF
:
1513 case BUILT_IN_SQRTL
:
1514 builtin_optab
= sqrt_optab
; break;
1519 /* Compute into TARGET.
1520 Set TARGET to wherever the result comes back. */
1521 target
= expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist
))),
1522 builtin_optab
, op0
, target
, 0);
1524 /* If we were unable to expand via the builtin, stop the
1525 sequence (without outputting the insns) and return 0, causing
1526 a call to the library function. */
1533 /* If errno must be maintained and if we are not allowing unsafe
1534 math optimizations, check the result. */
1536 if (flag_errno_math
&& ! flag_unsafe_math_optimizations
)
1540 /* Don't define the builtin FP instructions
1541 if your machine is not IEEE. */
1542 if (TARGET_FLOAT_FORMAT
!= IEEE_FLOAT_FORMAT
)
1545 lab1
= gen_label_rtx ();
1547 /* Test the result; if it is NaN, set errno=EDOM because
1548 the argument was not in the domain. */
1549 emit_cmp_and_jump_insns (target
, target
, EQ
, 0, GET_MODE (target
),
1554 #ifdef GEN_ERRNO_RTX
1555 rtx errno_rtx
= GEN_ERRNO_RTX
;
1558 = gen_rtx_MEM (word_mode
, gen_rtx_SYMBOL_REF (Pmode
, "errno"));
1561 emit_move_insn (errno_rtx
, GEN_INT (TARGET_EDOM
));
1564 /* We can't set errno=EDOM directly; let the library call do it.
1565 Pop the arguments right away in case the call gets deleted. */
1567 expand_call (exp
, target
, 0);
1574 /* Output the entire sequence. */
1575 insns
= get_insns ();
1582 /* Expand expression EXP which is a call to the strlen builtin. Return 0
1583 if we failed the caller should emit a normal call, otherwise
1584 try to get the result in TARGET, if convenient. */
1587 expand_builtin_strlen (exp
, target
)
1591 tree arglist
= TREE_OPERAND (exp
, 1);
1592 enum machine_mode value_mode
= TYPE_MODE (TREE_TYPE (exp
));
1594 if (!validate_arglist (arglist
, POINTER_TYPE
, VOID_TYPE
))
1599 tree src
= TREE_VALUE (arglist
);
1602 = get_pointer_alignment (src
, BIGGEST_ALIGNMENT
) / BITS_PER_UNIT
;
1604 rtx result
, src_reg
, char_rtx
, before_strlen
;
1605 enum machine_mode insn_mode
= value_mode
, char_mode
;
1606 enum insn_code icode
= CODE_FOR_nothing
;
1608 /* If SRC is not a pointer type, don't do this operation inline. */
1612 /* Bail out if we can't compute strlen in the right mode. */
1613 while (insn_mode
!= VOIDmode
)
1615 icode
= strlen_optab
->handlers
[(int) insn_mode
].insn_code
;
1616 if (icode
!= CODE_FOR_nothing
)
1619 insn_mode
= GET_MODE_WIDER_MODE (insn_mode
);
1621 if (insn_mode
== VOIDmode
)
1624 /* Make a place to write the result of the instruction. */
1627 && GET_CODE (result
) == REG
1628 && GET_MODE (result
) == insn_mode
1629 && REGNO (result
) >= FIRST_PSEUDO_REGISTER
))
1630 result
= gen_reg_rtx (insn_mode
);
1632 /* Make a place to hold the source address. We will not expand
1633 the actual source until we are sure that the expansion will
1634 not fail -- there are trees that cannot be expanded twice. */
1635 src_reg
= gen_reg_rtx (Pmode
);
1637 /* Mark the beginning of the strlen sequence so we can emit the
1638 source operand later. */
1639 before_strlen
= get_last_insn();
1641 char_rtx
= const0_rtx
;
1642 char_mode
= insn_data
[(int) icode
].operand
[2].mode
;
1643 if (! (*insn_data
[(int) icode
].operand
[2].predicate
) (char_rtx
,
1645 char_rtx
= copy_to_mode_reg (char_mode
, char_rtx
);
1647 pat
= GEN_FCN (icode
) (result
, gen_rtx_MEM (BLKmode
, src_reg
),
1648 char_rtx
, GEN_INT (align
));
1653 /* Now that we are assured of success, expand the source. */
1655 pat
= memory_address (BLKmode
,
1656 expand_expr (src
, src_reg
, ptr_mode
, EXPAND_SUM
));
1658 emit_move_insn (src_reg
, pat
);
1659 pat
= gen_sequence ();
1663 emit_insn_after (pat
, before_strlen
);
1665 emit_insn_before (pat
, get_insns ());
1667 /* Return the value in the proper mode for this function. */
1668 if (GET_MODE (result
) == value_mode
)
1670 else if (target
!= 0)
1671 convert_move (target
, result
, 0);
1673 target
= convert_to_mode (value_mode
, result
, 0);
1679 /* Expand a call to the strstr builtin. Return 0 if we failed the
1680 caller should emit a normal call, otherwise try to get the result
1681 in TARGET, if convenient (and in mode MODE if that's convenient). */
1684 expand_builtin_strstr (arglist
, target
, mode
)
1687 enum machine_mode mode
;
1689 if (!validate_arglist (arglist
, POINTER_TYPE
, POINTER_TYPE
, VOID_TYPE
))
1693 tree s1
= TREE_VALUE (arglist
), s2
= TREE_VALUE (TREE_CHAIN (arglist
));
1695 const char *p1
, *p2
;
1704 const char *r
= strstr (p1
, p2
);
1709 /* Return an offset into the constant string argument. */
1710 return expand_expr (fold (build (PLUS_EXPR
, TREE_TYPE (s1
),
1711 s1
, ssize_int (r
- p1
))),
1712 target
, mode
, EXPAND_NORMAL
);
1716 return expand_expr (s1
, target
, mode
, EXPAND_NORMAL
);
1721 fn
= built_in_decls
[BUILT_IN_STRCHR
];
1725 /* New argument list transforming strstr(s1, s2) to
1726 strchr(s1, s2[0]). */
1728 build_tree_list (NULL_TREE
, build_int_2 (p2
[0], 0));
1729 arglist
= tree_cons (NULL_TREE
, s1
, arglist
);
1730 return expand_expr (build_function_call_expr (fn
, arglist
),
1731 target
, mode
, EXPAND_NORMAL
);
1735 /* Expand a call to the strchr builtin. Return 0 if we failed the
1736 caller should emit a normal call, otherwise try to get the result
1737 in TARGET, if convenient (and in mode MODE if that's convenient). */
1740 expand_builtin_strchr (arglist
, target
, mode
)
1743 enum machine_mode mode
;
1745 if (!validate_arglist (arglist
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
1749 tree s1
= TREE_VALUE (arglist
), s2
= TREE_VALUE (TREE_CHAIN (arglist
));
1752 if (TREE_CODE (s2
) != INTEGER_CST
)
1761 if (target_char_cast (s2
, &c
))
1769 /* Return an offset into the constant string argument. */
1770 return expand_expr (fold (build (PLUS_EXPR
, TREE_TYPE (s1
),
1771 s1
, ssize_int (r
- p1
))),
1772 target
, mode
, EXPAND_NORMAL
);
1775 /* FIXME: Should use here strchrM optab so that ports can optimize
1781 /* Expand a call to the strrchr builtin. Return 0 if we failed the
1782 caller should emit a normal call, otherwise try to get the result
1783 in TARGET, if convenient (and in mode MODE if that's convenient). */
1786 expand_builtin_strrchr (arglist
, target
, mode
)
1789 enum machine_mode mode
;
1791 if (!validate_arglist (arglist
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
1795 tree s1
= TREE_VALUE (arglist
), s2
= TREE_VALUE (TREE_CHAIN (arglist
));
1799 if (TREE_CODE (s2
) != INTEGER_CST
)
1808 if (target_char_cast (s2
, &c
))
1811 r
= strrchr (p1
, c
);
1816 /* Return an offset into the constant string argument. */
1817 return expand_expr (fold (build (PLUS_EXPR
, TREE_TYPE (s1
),
1818 s1
, ssize_int (r
- p1
))),
1819 target
, mode
, EXPAND_NORMAL
);
1822 if (! integer_zerop (s2
))
1825 fn
= built_in_decls
[BUILT_IN_STRCHR
];
1829 /* Transform strrchr(s1, '\0') to strchr(s1, '\0'). */
1830 return expand_expr (build_function_call_expr (fn
, arglist
),
1831 target
, mode
, EXPAND_NORMAL
);
1835 /* Expand a call to the strpbrk builtin. Return 0 if we failed the
1836 caller should emit a normal call, otherwise try to get the result
1837 in TARGET, if convenient (and in mode MODE if that's convenient). */
1840 expand_builtin_strpbrk (arglist
, target
, mode
)
1843 enum machine_mode mode
;
1845 if (!validate_arglist (arglist
, POINTER_TYPE
, POINTER_TYPE
, VOID_TYPE
))
1849 tree s1
= TREE_VALUE (arglist
), s2
= TREE_VALUE (TREE_CHAIN (arglist
));
1851 const char *p1
, *p2
;
1860 const char *r
= strpbrk (p1
, p2
);
1865 /* Return an offset into the constant string argument. */
1866 return expand_expr (fold (build (PLUS_EXPR
, TREE_TYPE (s1
),
1867 s1
, ssize_int (r
- p1
))),
1868 target
, mode
, EXPAND_NORMAL
);
1873 /* strpbrk(x, "") == NULL.
1874 Evaluate and ignore the arguments in case they had
1876 expand_expr (s1
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
1881 return 0; /* Really call strpbrk. */
1883 fn
= built_in_decls
[BUILT_IN_STRCHR
];
1887 /* New argument list transforming strpbrk(s1, s2) to
1888 strchr(s1, s2[0]). */
1890 build_tree_list (NULL_TREE
, build_int_2 (p2
[0], 0));
1891 arglist
= tree_cons (NULL_TREE
, s1
, arglist
);
1892 return expand_expr (build_function_call_expr (fn
, arglist
),
1893 target
, mode
, EXPAND_NORMAL
);
1897 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
1898 bytes from constant string DATA + OFFSET and return it as target
1902 builtin_memcpy_read_str (data
, offset
, mode
)
1904 HOST_WIDE_INT offset
;
1905 enum machine_mode mode
;
1907 const char *str
= (const char *) data
;
1910 || ((unsigned HOST_WIDE_INT
) offset
+ GET_MODE_SIZE (mode
)
1911 > strlen (str
) + 1))
1912 abort (); /* Attempt to read past the end of constant string. */
1914 return c_readstr (str
+ offset
, mode
);
1917 /* Expand a call to the memcpy builtin, with arguments in ARGLIST.
1918 Return 0 if we failed, the caller should emit a normal call, otherwise
1919 try to get the result in TARGET, if convenient (and in mode MODE if
1920 that's convenient). */
1923 expand_builtin_memcpy (arglist
, target
, mode
)
1926 enum machine_mode mode
;
1928 if (!validate_arglist (arglist
,
1929 POINTER_TYPE
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
1933 tree dest
= TREE_VALUE (arglist
);
1934 tree src
= TREE_VALUE (TREE_CHAIN (arglist
));
1935 tree len
= TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist
)));
1936 const char *src_str
;
1938 unsigned int src_align
= get_pointer_alignment (src
, BIGGEST_ALIGNMENT
);
1939 unsigned int dest_align
1940 = get_pointer_alignment (dest
, BIGGEST_ALIGNMENT
);
1941 rtx dest_mem
, src_mem
, dest_addr
, len_rtx
;
1943 /* If DEST is not a pointer type, call the normal function. */
1944 if (dest_align
== 0)
1947 /* If the LEN parameter is zero, return DEST. */
1948 if (host_integerp (len
, 1) && tree_low_cst (len
, 1) == 0)
1950 /* Evaluate and ignore SRC in case it has side-effects. */
1951 expand_expr (src
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
1952 return expand_expr (dest
, target
, mode
, EXPAND_NORMAL
);
1955 /* If either SRC is not a pointer type, don't do this
1956 operation in-line. */
1960 dest_mem
= get_memory_rtx (dest
);
1961 set_mem_align (dest_mem
, dest_align
);
1962 len_rtx
= expand_expr (len
, NULL_RTX
, VOIDmode
, 0);
1963 src_str
= c_getstr (src
);
1965 /* If SRC is a string constant and block move would be done
1966 by pieces, we can avoid loading the string from memory
1967 and only stored the computed constants. */
1969 && GET_CODE (len_rtx
) == CONST_INT
1970 && (unsigned HOST_WIDE_INT
) INTVAL (len_rtx
) <= strlen (src_str
) + 1
1971 && can_store_by_pieces (INTVAL (len_rtx
), builtin_memcpy_read_str
,
1972 (PTR
) src_str
, dest_align
))
1974 store_by_pieces (dest_mem
, INTVAL (len_rtx
),
1975 builtin_memcpy_read_str
,
1976 (PTR
) src_str
, dest_align
);
1977 return force_operand (XEXP (dest_mem
, 0), NULL_RTX
);
1980 src_mem
= get_memory_rtx (src
);
1981 set_mem_align (src_mem
, src_align
);
1983 /* Copy word part most expediently. */
1984 dest_addr
= emit_block_move (dest_mem
, src_mem
, len_rtx
);
1987 dest_addr
= force_operand (XEXP (dest_mem
, 0), NULL_RTX
);
1993 /* Expand expression EXP, which is a call to the strcpy builtin. Return 0
1994 if we failed the caller should emit a normal call, otherwise try to get
1995 the result in TARGET, if convenient (and in mode MODE if that's
1999 expand_builtin_strcpy (exp
, target
, mode
)
2002 enum machine_mode mode
;
2004 tree arglist
= TREE_OPERAND (exp
, 1);
2007 if (!validate_arglist (arglist
, POINTER_TYPE
, POINTER_TYPE
, VOID_TYPE
))
2010 fn
= built_in_decls
[BUILT_IN_MEMCPY
];
2014 len
= c_strlen (TREE_VALUE (TREE_CHAIN (arglist
)));
2018 len
= size_binop (PLUS_EXPR
, len
, ssize_int (1));
2019 chainon (arglist
, build_tree_list (NULL_TREE
, len
));
2020 return expand_expr (build_function_call_expr (fn
, arglist
),
2021 target
, mode
, EXPAND_NORMAL
);
2024 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
2025 bytes from constant string DATA + OFFSET and return it as target
2029 builtin_strncpy_read_str (data
, offset
, mode
)
2031 HOST_WIDE_INT offset
;
2032 enum machine_mode mode
;
2034 const char *str
= (const char *) data
;
2036 if ((unsigned HOST_WIDE_INT
) offset
> strlen (str
))
2039 return c_readstr (str
+ offset
, mode
);
2042 /* Expand expression EXP, which is a call to the strncpy builtin. Return 0
2043 if we failed the caller should emit a normal call. */
2046 expand_builtin_strncpy (arglist
, target
, mode
)
2049 enum machine_mode mode
;
2051 if (!validate_arglist (arglist
,
2052 POINTER_TYPE
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
2056 tree slen
= c_strlen (TREE_VALUE (TREE_CHAIN (arglist
)));
2057 tree len
= TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist
)));
2060 /* We must be passed a constant len parameter. */
2061 if (TREE_CODE (len
) != INTEGER_CST
)
2064 /* If the len parameter is zero, return the dst parameter. */
2065 if (integer_zerop (len
))
2067 /* Evaluate and ignore the src argument in case it has
2069 expand_expr (TREE_VALUE (TREE_CHAIN (arglist
)), const0_rtx
,
2070 VOIDmode
, EXPAND_NORMAL
);
2071 /* Return the dst parameter. */
2072 return expand_expr (TREE_VALUE (arglist
), target
, mode
,
2076 /* Now, we must be passed a constant src ptr parameter. */
2077 if (slen
== 0 || TREE_CODE (slen
) != INTEGER_CST
)
2080 slen
= size_binop (PLUS_EXPR
, slen
, ssize_int (1));
2082 /* We're required to pad with trailing zeros if the requested
2083 len is greater than strlen(s2)+1. In that case try to
2084 use store_by_pieces, if it fails, punt. */
2085 if (tree_int_cst_lt (slen
, len
))
2087 tree dest
= TREE_VALUE (arglist
);
2088 unsigned int dest_align
2089 = get_pointer_alignment (dest
, BIGGEST_ALIGNMENT
);
2090 const char *p
= c_getstr (TREE_VALUE (TREE_CHAIN (arglist
)));
2093 if (!p
|| dest_align
== 0 || !host_integerp (len
, 1)
2094 || !can_store_by_pieces (tree_low_cst (len
, 1),
2095 builtin_strncpy_read_str
,
2096 (PTR
) p
, dest_align
))
2099 dest_mem
= get_memory_rtx (dest
);
2100 store_by_pieces (dest_mem
, tree_low_cst (len
, 1),
2101 builtin_strncpy_read_str
,
2102 (PTR
) p
, dest_align
);
2103 return force_operand (XEXP (dest_mem
, 0), NULL_RTX
);
2106 /* OK transform into builtin memcpy. */
2107 fn
= built_in_decls
[BUILT_IN_MEMCPY
];
2110 return expand_expr (build_function_call_expr (fn
, arglist
),
2111 target
, mode
, EXPAND_NORMAL
);
2115 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
2116 bytes from constant string DATA + OFFSET and return it as target
2120 builtin_memset_read_str (data
, offset
, mode
)
2122 HOST_WIDE_INT offset ATTRIBUTE_UNUSED
;
2123 enum machine_mode mode
;
2125 const char *c
= (const char *) data
;
2126 char *p
= alloca (GET_MODE_SIZE (mode
));
2128 memset (p
, *c
, GET_MODE_SIZE (mode
));
2130 return c_readstr (p
, mode
);
2133 /* Expand expression EXP, which is a call to the memset builtin. Return 0
2134 if we failed the caller should emit a normal call, otherwise try to get
2135 the result in TARGET, if convenient (and in mode MODE if that's
2139 expand_builtin_memset (exp
, target
, mode
)
2142 enum machine_mode mode
;
2144 tree arglist
= TREE_OPERAND (exp
, 1);
2146 if (!validate_arglist (arglist
,
2147 POINTER_TYPE
, INTEGER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
2151 tree dest
= TREE_VALUE (arglist
);
2152 tree val
= TREE_VALUE (TREE_CHAIN (arglist
));
2153 tree len
= TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist
)));
2156 unsigned int dest_align
2157 = get_pointer_alignment (dest
, BIGGEST_ALIGNMENT
);
2158 rtx dest_mem
, dest_addr
, len_rtx
;
2160 /* If DEST is not a pointer type, don't do this
2161 operation in-line. */
2162 if (dest_align
== 0)
2165 /* If the LEN parameter is zero, return DEST. */
2166 if (host_integerp (len
, 1) && tree_low_cst (len
, 1) == 0)
2168 /* Evaluate and ignore VAL in case it has side-effects. */
2169 expand_expr (val
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2170 return expand_expr (dest
, target
, mode
, EXPAND_NORMAL
);
2173 if (TREE_CODE (val
) != INTEGER_CST
)
2176 if (target_char_cast (val
, &c
))
2181 if (!host_integerp (len
, 1))
2183 if (!can_store_by_pieces (tree_low_cst (len
, 1),
2184 builtin_memset_read_str
, (PTR
) &c
,
2188 dest_mem
= get_memory_rtx (dest
);
2189 store_by_pieces (dest_mem
, tree_low_cst (len
, 1),
2190 builtin_memset_read_str
,
2191 (PTR
) &c
, dest_align
);
2192 return force_operand (XEXP (dest_mem
, 0), NULL_RTX
);
2195 len_rtx
= expand_expr (len
, NULL_RTX
, VOIDmode
, 0);
2197 dest_mem
= get_memory_rtx (dest
);
2198 set_mem_align (dest_mem
, dest_align
);
2199 dest_addr
= clear_storage (dest_mem
, len_rtx
);
2202 dest_addr
= force_operand (XEXP (dest_mem
, 0), NULL_RTX
);
2208 /* Expand expression EXP, which is a call to the bzero builtin. Return 0
2209 if we failed the caller should emit a normal call. */
2212 expand_builtin_bzero (exp
)
2215 tree arglist
= TREE_OPERAND (exp
, 1);
2216 tree dest
, size
, newarglist
;
2219 if (!validate_arglist (arglist
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
2222 dest
= TREE_VALUE (arglist
);
2223 size
= TREE_VALUE (TREE_CHAIN (arglist
));
2225 /* New argument list transforming bzero(ptr x, int y) to
2226 memset(ptr x, int 0, size_t y). This is done this way
2227 so that if it isn't expanded inline, we fallback to
2228 calling bzero instead of memset. */
2230 newarglist
= build_tree_list (NULL_TREE
, convert (sizetype
, size
));
2231 newarglist
= tree_cons (NULL_TREE
, integer_zero_node
, newarglist
);
2232 newarglist
= tree_cons (NULL_TREE
, dest
, newarglist
);
2234 TREE_OPERAND (exp
, 1) = newarglist
;
2235 result
= expand_builtin_memset (exp
, const0_rtx
, VOIDmode
);
2237 /* Always restore the original arguments. */
2238 TREE_OPERAND (exp
, 1) = arglist
;
2243 /* Expand expression EXP, which is a call to the memcmp or the strcmp builtin.
2244 ARGLIST is the argument list for this call. Return 0 if we failed and the
2245 caller should emit a normal call, otherwise try to get the result in
2246 TARGET, if convenient (and in mode MODE, if that's convenient). */
2249 expand_builtin_memcmp (exp
, arglist
, target
, mode
)
2250 tree exp ATTRIBUTE_UNUSED
;
2253 enum machine_mode mode
;
2255 tree arg1
, arg2
, len
;
2256 const char *p1
, *p2
;
2258 if (!validate_arglist (arglist
,
2259 POINTER_TYPE
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
2262 arg1
= TREE_VALUE (arglist
);
2263 arg2
= TREE_VALUE (TREE_CHAIN (arglist
));
2264 len
= TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist
)));
2266 /* If the len parameter is zero, return zero. */
2267 if (host_integerp (len
, 1) && tree_low_cst (len
, 1) == 0)
2269 /* Evaluate and ignore arg1 and arg2 in case they have
2271 expand_expr (arg1
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2272 expand_expr (arg2
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2276 p1
= c_getstr (arg1
);
2277 p2
= c_getstr (arg2
);
2279 /* If all arguments are constant, and the value of len is not greater
2280 than the lengths of arg1 and arg2, evaluate at compile-time. */
2281 if (host_integerp (len
, 1) && p1
&& p2
2282 && compare_tree_int (len
, strlen (p1
) + 1) <= 0
2283 && compare_tree_int (len
, strlen (p2
) + 1) <= 0)
2285 const int r
= memcmp (p1
, p2
, tree_low_cst (len
, 1));
2287 return (r
< 0 ? constm1_rtx
: (r
> 0 ? const1_rtx
: const0_rtx
));
2290 /* If len parameter is one, return an expression corresponding to
2291 (*(const unsigned char*)arg1 - (const unsigned char*)arg2). */
2292 if (host_integerp (len
, 1) && tree_low_cst (len
, 1) == 1)
2294 tree cst_uchar_node
= build_type_variant (unsigned_char_type_node
, 1, 0);
2295 tree cst_uchar_ptr_node
= build_pointer_type (cst_uchar_node
);
2297 fold (build1 (CONVERT_EXPR
, integer_type_node
,
2298 build1 (INDIRECT_REF
, cst_uchar_node
,
2299 build1 (NOP_EXPR
, cst_uchar_ptr_node
, arg1
))));
2301 fold (build1 (CONVERT_EXPR
, integer_type_node
,
2302 build1 (INDIRECT_REF
, cst_uchar_node
,
2303 build1 (NOP_EXPR
, cst_uchar_ptr_node
, arg2
))));
2304 tree result
= fold (build (MINUS_EXPR
, integer_type_node
, ind1
, ind2
));
2305 return expand_expr (result
, target
, mode
, EXPAND_NORMAL
);
2308 #ifdef HAVE_cmpstrsi
2310 rtx arg1_rtx
, arg2_rtx
, arg3_rtx
;
2315 = get_pointer_alignment (arg1
, BIGGEST_ALIGNMENT
) / BITS_PER_UNIT
;
2317 = get_pointer_alignment (arg2
, BIGGEST_ALIGNMENT
) / BITS_PER_UNIT
;
2318 enum machine_mode insn_mode
2319 = insn_data
[(int) CODE_FOR_cmpstrsi
].operand
[0].mode
;
2321 /* If we don't have POINTER_TYPE, call the function. */
2322 if (arg1_align
== 0 || arg2_align
== 0)
2325 /* Make a place to write the result of the instruction. */
2328 && GET_CODE (result
) == REG
&& GET_MODE (result
) == insn_mode
2329 && REGNO (result
) >= FIRST_PSEUDO_REGISTER
))
2330 result
= gen_reg_rtx (insn_mode
);
2332 arg1_rtx
= get_memory_rtx (arg1
);
2333 arg2_rtx
= get_memory_rtx (arg2
);
2334 arg3_rtx
= expand_expr (len
, NULL_RTX
, VOIDmode
, 0);
2338 insn
= gen_cmpstrsi (result
, arg1_rtx
, arg2_rtx
, arg3_rtx
,
2339 GEN_INT (MIN (arg1_align
, arg2_align
)));
2344 emit_library_call_value (memcmp_libfunc
, result
, LCT_PURE_MAKE_BLOCK
,
2345 TYPE_MODE (integer_type_node
), 3,
2346 XEXP (arg1_rtx
, 0), Pmode
,
2347 XEXP (arg2_rtx
, 0), Pmode
,
2348 convert_to_mode (TYPE_MODE (sizetype
), arg3_rtx
,
2349 TREE_UNSIGNED (sizetype
)),
2350 TYPE_MODE (sizetype
));
2352 /* Return the value in the proper mode for this function. */
2353 mode
= TYPE_MODE (TREE_TYPE (exp
));
2354 if (GET_MODE (result
) == mode
)
2356 else if (target
!= 0)
2358 convert_move (target
, result
, 0);
2362 return convert_to_mode (mode
, result
, 0);
2369 /* Expand expression EXP, which is a call to the strcmp builtin. Return 0
2370 if we failed the caller should emit a normal call, otherwise try to get
2371 the result in TARGET, if convenient. */
2374 expand_builtin_strcmp (exp
, target
, mode
)
2377 enum machine_mode mode
;
2379 tree arglist
= TREE_OPERAND (exp
, 1);
2380 tree arg1
, arg2
, len
, len2
, fn
;
2381 const char *p1
, *p2
;
2383 if (!validate_arglist (arglist
, POINTER_TYPE
, POINTER_TYPE
, VOID_TYPE
))
2386 arg1
= TREE_VALUE (arglist
);
2387 arg2
= TREE_VALUE (TREE_CHAIN (arglist
));
2389 p1
= c_getstr (arg1
);
2390 p2
= c_getstr (arg2
);
2394 const int i
= strcmp (p1
, p2
);
2395 return (i
< 0 ? constm1_rtx
: (i
> 0 ? const1_rtx
: const0_rtx
));
2398 /* If either arg is "", return an expression corresponding to
2399 (*(const unsigned char*)arg1 - (const unsigned char*)arg2). */
2400 if ((p1
&& *p1
== '\0') || (p2
&& *p2
== '\0'))
2402 tree cst_uchar_node
= build_type_variant (unsigned_char_type_node
, 1, 0);
2403 tree cst_uchar_ptr_node
= build_pointer_type (cst_uchar_node
);
2405 fold (build1 (CONVERT_EXPR
, integer_type_node
,
2406 build1 (INDIRECT_REF
, cst_uchar_node
,
2407 build1 (NOP_EXPR
, cst_uchar_ptr_node
, arg1
))));
2409 fold (build1 (CONVERT_EXPR
, integer_type_node
,
2410 build1 (INDIRECT_REF
, cst_uchar_node
,
2411 build1 (NOP_EXPR
, cst_uchar_ptr_node
, arg2
))));
2412 tree result
= fold (build (MINUS_EXPR
, integer_type_node
, ind1
, ind2
));
2413 return expand_expr (result
, target
, mode
, EXPAND_NORMAL
);
2416 len
= c_strlen (arg1
);
2417 len2
= c_strlen (arg2
);
2420 len
= size_binop (PLUS_EXPR
, ssize_int (1), len
);
2423 len2
= size_binop (PLUS_EXPR
, ssize_int (1), len2
);
2425 /* If we don't have a constant length for the first, use the length
2426 of the second, if we know it. We don't require a constant for
2427 this case; some cost analysis could be done if both are available
2428 but neither is constant. For now, assume they're equally cheap
2429 unless one has side effects.
2431 If both strings have constant lengths, use the smaller. This
2432 could arise if optimization results in strcpy being called with
2433 two fixed strings, or if the code was machine-generated. We should
2434 add some code to the `memcmp' handler below to deal with such
2435 situations, someday. */
2437 if (!len
|| TREE_CODE (len
) != INTEGER_CST
)
2439 if (len2
&& !TREE_SIDE_EFFECTS (len2
))
2444 else if (len2
&& TREE_CODE (len2
) == INTEGER_CST
2445 && tree_int_cst_lt (len2
, len
))
2448 /* If both arguments have side effects, we cannot optimize. */
2449 if (TREE_SIDE_EFFECTS (len
))
2452 fn
= built_in_decls
[BUILT_IN_MEMCMP
];
2456 chainon (arglist
, build_tree_list (NULL_TREE
, len
));
2457 return expand_expr (build_function_call_expr (fn
, arglist
),
2458 target
, mode
, EXPAND_NORMAL
);
2461 /* Expand expression EXP, which is a call to the strncmp builtin. Return 0
2462 if we failed the caller should emit a normal call, otherwise try to get
2463 the result in TARGET, if convenient. */
2466 expand_builtin_strncmp (exp
, target
, mode
)
2469 enum machine_mode mode
;
2471 tree arglist
= TREE_OPERAND (exp
, 1);
2472 tree fn
, newarglist
, len
= 0;
2473 tree arg1
, arg2
, arg3
;
2474 const char *p1
, *p2
;
2476 if (!validate_arglist (arglist
,
2477 POINTER_TYPE
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
2480 arg1
= TREE_VALUE (arglist
);
2481 arg2
= TREE_VALUE (TREE_CHAIN (arglist
));
2482 arg3
= TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist
)));
2484 /* If the len parameter is zero, return zero. */
2485 if (host_integerp (arg3
, 1) && tree_low_cst (arg3
, 1) == 0)
2487 /* Evaluate and ignore arg1 and arg2 in case they have
2489 expand_expr (arg1
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2490 expand_expr (arg2
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2494 p1
= c_getstr (arg1
);
2495 p2
= c_getstr (arg2
);
2497 /* If all arguments are constant, evaluate at compile-time. */
2498 if (host_integerp (arg3
, 1) && p1
&& p2
)
2500 const int r
= strncmp (p1
, p2
, tree_low_cst (arg3
, 1));
2501 return (r
< 0 ? constm1_rtx
: (r
> 0 ? const1_rtx
: const0_rtx
));
2504 /* If len == 1 or (either string parameter is "" and (len >= 1)),
2505 return (*(const u_char*)arg1 - *(const u_char*)arg2). */
2506 if (host_integerp (arg3
, 1)
2507 && (tree_low_cst (arg3
, 1) == 1
2508 || (tree_low_cst (arg3
, 1) > 1
2509 && ((p1
&& *p1
== '\0') || (p2
&& *p2
== '\0')))))
2511 tree cst_uchar_node
= build_type_variant (unsigned_char_type_node
, 1, 0);
2512 tree cst_uchar_ptr_node
= build_pointer_type (cst_uchar_node
);
2514 fold (build1 (CONVERT_EXPR
, integer_type_node
,
2515 build1 (INDIRECT_REF
, cst_uchar_node
,
2516 build1 (NOP_EXPR
, cst_uchar_ptr_node
, arg1
))));
2518 fold (build1 (CONVERT_EXPR
, integer_type_node
,
2519 build1 (INDIRECT_REF
, cst_uchar_node
,
2520 build1 (NOP_EXPR
, cst_uchar_ptr_node
, arg2
))));
2521 tree result
= fold (build (MINUS_EXPR
, integer_type_node
, ind1
, ind2
));
2522 return expand_expr (result
, target
, mode
, EXPAND_NORMAL
);
2525 /* If c_strlen can determine an expression for one of the string
2526 lengths, and it doesn't have side effects, then call
2527 expand_builtin_memcmp() using length MIN(strlen(string)+1, arg3). */
2529 /* Perhaps one of the strings is really constant, if so prefer
2530 that constant length over the other string's length. */
2532 len
= c_strlen (arg1
);
2534 len
= c_strlen (arg2
);
2536 /* If we still don't have a len, try either string arg as long
2537 as they don't have side effects. */
2538 if (!len
&& !TREE_SIDE_EFFECTS (arg1
))
2539 len
= c_strlen (arg1
);
2540 if (!len
&& !TREE_SIDE_EFFECTS (arg2
))
2541 len
= c_strlen (arg2
);
2542 /* If we still don't have a length, punt. */
2546 fn
= built_in_decls
[BUILT_IN_MEMCMP
];
2550 /* Add one to the string length. */
2551 len
= fold (size_binop (PLUS_EXPR
, len
, ssize_int (1)));
2553 /* The actual new length parameter is MIN(len,arg3). */
2554 len
= fold (build (MIN_EXPR
, TREE_TYPE (len
), len
, arg3
));
2556 newarglist
= build_tree_list (NULL_TREE
, len
);
2557 newarglist
= tree_cons (NULL_TREE
, arg2
, newarglist
);
2558 newarglist
= tree_cons (NULL_TREE
, arg1
, newarglist
);
2559 return expand_expr (build_function_call_expr (fn
, newarglist
),
2560 target
, mode
, EXPAND_NORMAL
);
2563 /* Expand expression EXP, which is a call to the strcat builtin.
2564 Return 0 if we failed the caller should emit a normal call,
2565 otherwise try to get the result in TARGET, if convenient. */
2568 expand_builtin_strcat (arglist
, target
, mode
)
2571 enum machine_mode mode
;
2573 if (!validate_arglist (arglist
, POINTER_TYPE
, POINTER_TYPE
, VOID_TYPE
))
2577 tree dst
= TREE_VALUE (arglist
),
2578 src
= TREE_VALUE (TREE_CHAIN (arglist
));
2579 const char *p
= c_getstr (src
);
2581 /* If the string length is zero, return the dst parameter. */
2582 if (p
&& *p
== '\0')
2583 return expand_expr (dst
, target
, mode
, EXPAND_NORMAL
);
2589 /* Expand expression EXP, which is a call to the strncat builtin.
2590 Return 0 if we failed the caller should emit a normal call,
2591 otherwise try to get the result in TARGET, if convenient. */
2594 expand_builtin_strncat (arglist
, target
, mode
)
2597 enum machine_mode mode
;
2599 if (!validate_arglist (arglist
,
2600 POINTER_TYPE
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
2604 tree dst
= TREE_VALUE (arglist
),
2605 src
= TREE_VALUE (TREE_CHAIN (arglist
)),
2606 len
= TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist
)));
2607 const char *p
= c_getstr (src
);
2609 /* If the requested length is zero, or the src parameter string
2610 length is zero, return the dst parameter. */
2611 if (integer_zerop (len
) || (p
&& *p
== '\0'))
2613 /* Evaluate and ignore the src and len parameters in case
2614 they have side-effects. */
2615 expand_expr (src
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2616 expand_expr (len
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2617 return expand_expr (dst
, target
, mode
, EXPAND_NORMAL
);
2620 /* If the requested len is greater than or equal to the string
2621 length, call strcat. */
2622 if (TREE_CODE (len
) == INTEGER_CST
&& p
2623 && compare_tree_int (len
, strlen (p
)) >= 0)
2626 = tree_cons (NULL_TREE
, dst
, build_tree_list (NULL_TREE
, src
));
2627 tree fn
= built_in_decls
[BUILT_IN_STRCAT
];
2629 /* If the replacement _DECL isn't initialized, don't do the
2634 return expand_expr (build_function_call_expr (fn
, newarglist
),
2635 target
, mode
, EXPAND_NORMAL
);
2641 /* Expand expression EXP, which is a call to the strspn builtin.
2642 Return 0 if we failed the caller should emit a normal call,
2643 otherwise try to get the result in TARGET, if convenient. */
2646 expand_builtin_strspn (arglist
, target
, mode
)
2649 enum machine_mode mode
;
2651 if (!validate_arglist (arglist
, POINTER_TYPE
, POINTER_TYPE
, VOID_TYPE
))
2655 tree s1
= TREE_VALUE (arglist
), s2
= TREE_VALUE (TREE_CHAIN (arglist
));
2656 const char *p1
= c_getstr (s1
), *p2
= c_getstr (s2
);
2658 /* If both arguments are constants, evaluate at compile-time. */
2661 const size_t r
= strspn (p1
, p2
);
2662 return expand_expr (size_int (r
), target
, mode
, EXPAND_NORMAL
);
2665 /* If either argument is "", return 0. */
2666 if ((p1
&& *p1
== '\0') || (p2
&& *p2
== '\0'))
2668 /* Evaluate and ignore both arguments in case either one has
2670 expand_expr (s1
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2671 expand_expr (s2
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2678 /* Expand expression EXP, which is a call to the strcspn builtin.
2679 Return 0 if we failed the caller should emit a normal call,
2680 otherwise try to get the result in TARGET, if convenient. */
2683 expand_builtin_strcspn (arglist
, target
, mode
)
2686 enum machine_mode mode
;
2688 if (!validate_arglist (arglist
, POINTER_TYPE
, POINTER_TYPE
, VOID_TYPE
))
2692 tree s1
= TREE_VALUE (arglist
), s2
= TREE_VALUE (TREE_CHAIN (arglist
));
2693 const char *p1
= c_getstr (s1
), *p2
= c_getstr (s2
);
2695 /* If both arguments are constants, evaluate at compile-time. */
2698 const size_t r
= strcspn (p1
, p2
);
2699 return expand_expr (size_int (r
), target
, mode
, EXPAND_NORMAL
);
2702 /* If the first argument is "", return 0. */
2703 if (p1
&& *p1
== '\0')
2705 /* Evaluate and ignore argument s2 in case it has
2707 expand_expr (s2
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2711 /* If the second argument is "", return __builtin_strlen(s1). */
2712 if (p2
&& *p2
== '\0')
2714 tree newarglist
= build_tree_list (NULL_TREE
, s1
),
2715 fn
= built_in_decls
[BUILT_IN_STRLEN
];
2717 /* If the replacement _DECL isn't initialized, don't do the
2722 return expand_expr (build_function_call_expr (fn
, newarglist
),
2723 target
, mode
, EXPAND_NORMAL
);
2729 /* Expand a call to __builtin_saveregs, generating the result in TARGET,
2730 if that's convenient. */
2733 expand_builtin_saveregs ()
2737 /* Don't do __builtin_saveregs more than once in a function.
2738 Save the result of the first call and reuse it. */
2739 if (saveregs_value
!= 0)
2740 return saveregs_value
;
2742 /* When this function is called, it means that registers must be
2743 saved on entry to this function. So we migrate the call to the
2744 first insn of this function. */
2748 #ifdef EXPAND_BUILTIN_SAVEREGS
2749 /* Do whatever the machine needs done in this case. */
2750 val
= EXPAND_BUILTIN_SAVEREGS ();
2752 /* ??? We used to try and build up a call to the out of line function,
2753 guessing about what registers needed saving etc. This became much
2754 harder with __builtin_va_start, since we don't have a tree for a
2755 call to __builtin_saveregs to fall back on. There was exactly one
2756 port (i860) that used this code, and I'm unconvinced it could actually
2757 handle the general case. So we no longer try to handle anything
2758 weird and make the backend absorb the evil. */
2760 error ("__builtin_saveregs not supported by this target");
2767 saveregs_value
= val
;
2769 /* Put the sequence after the NOTE that starts the function. If this
2770 is inside a SEQUENCE, make the outer-level insn chain current, so
2771 the code is placed at the start of the function. */
2772 push_topmost_sequence ();
2773 emit_insns_after (seq
, get_insns ());
2774 pop_topmost_sequence ();
2779 /* __builtin_args_info (N) returns word N of the arg space info
2780 for the current function. The number and meanings of words
2781 is controlled by the definition of CUMULATIVE_ARGS. */
2784 expand_builtin_args_info (exp
)
2787 tree arglist
= TREE_OPERAND (exp
, 1);
2788 int nwords
= sizeof (CUMULATIVE_ARGS
) / sizeof (int);
2789 int *word_ptr
= (int *) ¤t_function_args_info
;
2791 /* These are used by the code below that is if 0'ed away */
2793 tree type
, elts
, result
;
2796 if (sizeof (CUMULATIVE_ARGS
) % sizeof (int) != 0)
2801 if (!host_integerp (TREE_VALUE (arglist
), 0))
2802 error ("argument of `__builtin_args_info' must be constant");
2805 HOST_WIDE_INT wordnum
= tree_low_cst (TREE_VALUE (arglist
), 0);
2807 if (wordnum
< 0 || wordnum
>= nwords
)
2808 error ("argument of `__builtin_args_info' out of range");
2810 return GEN_INT (word_ptr
[wordnum
]);
2814 error ("missing argument in `__builtin_args_info'");
2819 for (i
= 0; i
< nwords
; i
++)
2820 elts
= tree_cons (NULL_TREE
, build_int_2 (word_ptr
[i
], 0));
2822 type
= build_array_type (integer_type_node
,
2823 build_index_type (build_int_2 (nwords
, 0)));
2824 result
= build (CONSTRUCTOR
, type
, NULL_TREE
, nreverse (elts
));
2825 TREE_CONSTANT (result
) = 1;
2826 TREE_STATIC (result
) = 1;
2827 result
= build1 (INDIRECT_REF
, build_pointer_type (type
), result
);
2828 TREE_CONSTANT (result
) = 1;
2829 return expand_expr (result
, NULL_RTX
, VOIDmode
, 0);
2833 /* Expand ARGLIST, from a call to __builtin_next_arg. */
2836 expand_builtin_next_arg (arglist
)
2839 tree fntype
= TREE_TYPE (current_function_decl
);
2841 if ((TYPE_ARG_TYPES (fntype
) == 0
2842 || (TREE_VALUE (tree_last (TYPE_ARG_TYPES (fntype
)))
2844 && ! current_function_varargs
)
2846 error ("`va_start' used in function with fixed args");
2852 tree last_parm
= tree_last (DECL_ARGUMENTS (current_function_decl
));
2853 tree arg
= TREE_VALUE (arglist
);
2855 /* Strip off all nops for the sake of the comparison. This
2856 is not quite the same as STRIP_NOPS. It does more.
2857 We must also strip off INDIRECT_EXPR for C++ reference
2859 while (TREE_CODE (arg
) == NOP_EXPR
2860 || TREE_CODE (arg
) == CONVERT_EXPR
2861 || TREE_CODE (arg
) == NON_LVALUE_EXPR
2862 || TREE_CODE (arg
) == INDIRECT_REF
)
2863 arg
= TREE_OPERAND (arg
, 0);
2864 if (arg
!= last_parm
)
2865 warning ("second parameter of `va_start' not last named argument");
2867 else if (! current_function_varargs
)
2868 /* Evidently an out of date version of <stdarg.h>; can't validate
2869 va_start's second argument, but can still work as intended. */
2870 warning ("`__builtin_next_arg' called without an argument");
2872 return expand_binop (Pmode
, add_optab
,
2873 current_function_internal_arg_pointer
,
2874 current_function_arg_offset_rtx
,
2875 NULL_RTX
, 0, OPTAB_LIB_WIDEN
);
2878 /* Make it easier for the backends by protecting the valist argument
2879 from multiple evaluations. */
2882 stabilize_va_list (valist
, needs_lvalue
)
2886 if (TREE_CODE (va_list_type_node
) == ARRAY_TYPE
)
2888 if (TREE_SIDE_EFFECTS (valist
))
2889 valist
= save_expr (valist
);
2891 /* For this case, the backends will be expecting a pointer to
2892 TREE_TYPE (va_list_type_node), but it's possible we've
2893 actually been given an array (an actual va_list_type_node).
2895 if (TREE_CODE (TREE_TYPE (valist
)) == ARRAY_TYPE
)
2897 tree p1
= build_pointer_type (TREE_TYPE (va_list_type_node
));
2898 tree p2
= build_pointer_type (va_list_type_node
);
2900 valist
= build1 (ADDR_EXPR
, p2
, valist
);
2901 valist
= fold (build1 (NOP_EXPR
, p1
, valist
));
2910 if (! TREE_SIDE_EFFECTS (valist
))
2913 pt
= build_pointer_type (va_list_type_node
);
2914 valist
= fold (build1 (ADDR_EXPR
, pt
, valist
));
2915 TREE_SIDE_EFFECTS (valist
) = 1;
2918 if (TREE_SIDE_EFFECTS (valist
))
2919 valist
= save_expr (valist
);
2920 valist
= fold (build1 (INDIRECT_REF
, TREE_TYPE (TREE_TYPE (valist
)),
2927 /* The "standard" implementation of va_start: just assign `nextarg' to
2931 std_expand_builtin_va_start (stdarg_p
, valist
, nextarg
)
2940 /* The dummy named parameter is declared as a 'word' sized
2941 object, but if a 'word' is smaller than an 'int', it would
2942 have been promoted to int when it was added to the arglist. */
2943 int align
= PARM_BOUNDARY
/ BITS_PER_UNIT
;
2944 int size
= MAX (UNITS_PER_WORD
,
2945 GET_MODE_SIZE (TYPE_MODE (integer_type_node
)));
2946 int offset
= ((size
+ align
- 1) / align
) * align
;
2947 nextarg
= plus_constant (nextarg
, -offset
);
2950 t
= build (MODIFY_EXPR
, TREE_TYPE (valist
), valist
,
2951 make_tree (ptr_type_node
, nextarg
));
2952 TREE_SIDE_EFFECTS (t
) = 1;
2954 expand_expr (t
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2957 /* Expand ARGLIST, which from a call to __builtin_stdarg_va_start or
2958 __builtin_varargs_va_start, depending on STDARG_P. */
2961 expand_builtin_va_start (stdarg_p
, arglist
)
2966 tree chain
= arglist
, valist
;
2969 nextarg
= expand_builtin_next_arg (chain
= TREE_CHAIN (arglist
));
2971 nextarg
= expand_builtin_next_arg (NULL_TREE
);
2973 if (TREE_CHAIN (chain
))
2974 error ("too many arguments to function `va_start'");
2976 valist
= stabilize_va_list (TREE_VALUE (arglist
), 1);
2978 #ifdef EXPAND_BUILTIN_VA_START
2979 EXPAND_BUILTIN_VA_START (stdarg_p
, valist
, nextarg
);
2981 std_expand_builtin_va_start (stdarg_p
, valist
, nextarg
);
2987 /* The "standard" implementation of va_arg: read the value from the
2988 current (padded) address and increment by the (padded) size. */
2991 std_expand_builtin_va_arg (valist
, type
)
2995 HOST_WIDE_INT align
;
2996 HOST_WIDE_INT rounded_size
;
2999 /* Compute the rounded size of the type. */
3000 align
= PARM_BOUNDARY
/ BITS_PER_UNIT
;
3001 rounded_size
= (((int_size_in_bytes (type
) + align
- 1) / align
) * align
);
3005 if (PAD_VARARGS_DOWN
)
3007 /* Small args are padded downward. */
3010 = rounded_size
> align
? rounded_size
: int_size_in_bytes (type
);
3012 addr_tree
= build (PLUS_EXPR
, TREE_TYPE (addr_tree
), addr_tree
,
3013 build_int_2 (rounded_size
- adj
, 0));
3016 addr
= expand_expr (addr_tree
, NULL_RTX
, Pmode
, EXPAND_NORMAL
);
3017 addr
= copy_to_reg (addr
);
3019 /* Compute new value for AP. */
3020 t
= build (MODIFY_EXPR
, TREE_TYPE (valist
), valist
,
3021 build (PLUS_EXPR
, TREE_TYPE (valist
), valist
,
3022 build_int_2 (rounded_size
, 0)));
3023 TREE_SIDE_EFFECTS (t
) = 1;
3024 expand_expr (t
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
3029 /* Expand __builtin_va_arg, which is not really a builtin function, but
3030 a very special sort of operator. */
3033 expand_builtin_va_arg (valist
, type
)
3037 tree promoted_type
, want_va_type
, have_va_type
;
3039 /* Verify that valist is of the proper type. */
3041 want_va_type
= va_list_type_node
;
3042 have_va_type
= TREE_TYPE (valist
);
3043 if (TREE_CODE (want_va_type
) == ARRAY_TYPE
)
3045 /* If va_list is an array type, the argument may have decayed
3046 to a pointer type, e.g. by being passed to another function.
3047 In that case, unwrap both types so that we can compare the
3048 underlying records. */
3049 if (TREE_CODE (have_va_type
) == ARRAY_TYPE
3050 || TREE_CODE (have_va_type
) == POINTER_TYPE
)
3052 want_va_type
= TREE_TYPE (want_va_type
);
3053 have_va_type
= TREE_TYPE (have_va_type
);
3056 if (TYPE_MAIN_VARIANT (want_va_type
) != TYPE_MAIN_VARIANT (have_va_type
))
3058 error ("first argument to `va_arg' not of type `va_list'");
3062 /* Generate a diagnostic for requesting data of a type that cannot
3063 be passed through `...' due to type promotion at the call site. */
3064 else if ((promoted_type
= (*lang_type_promotes_to
) (type
)) != NULL_TREE
)
3066 const char *name
= "<anonymous type>", *pname
= 0;
3067 static int gave_help
;
3069 if (TYPE_NAME (type
))
3071 if (TREE_CODE (TYPE_NAME (type
)) == IDENTIFIER_NODE
)
3072 name
= IDENTIFIER_POINTER (TYPE_NAME (type
));
3073 else if (TREE_CODE (TYPE_NAME (type
)) == TYPE_DECL
3074 && DECL_NAME (TYPE_NAME (type
)))
3075 name
= IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type
)));
3077 if (TYPE_NAME (promoted_type
))
3079 if (TREE_CODE (TYPE_NAME (promoted_type
)) == IDENTIFIER_NODE
)
3080 pname
= IDENTIFIER_POINTER (TYPE_NAME (promoted_type
));
3081 else if (TREE_CODE (TYPE_NAME (promoted_type
)) == TYPE_DECL
3082 && DECL_NAME (TYPE_NAME (promoted_type
)))
3083 pname
= IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (promoted_type
)));
3086 error ("`%s' is promoted to `%s' when passed through `...'", name
, pname
);
3090 error ("(so you should pass `%s' not `%s' to `va_arg')", pname
, name
);
3097 /* Make it easier for the backends by protecting the valist argument
3098 from multiple evaluations. */
3099 valist
= stabilize_va_list (valist
, 0);
3101 #ifdef EXPAND_BUILTIN_VA_ARG
3102 addr
= EXPAND_BUILTIN_VA_ARG (valist
, type
);
3104 addr
= std_expand_builtin_va_arg (valist
, type
);
3108 #ifdef POINTERS_EXTEND_UNSIGNED
3109 if (GET_MODE (addr
) != Pmode
)
3110 addr
= convert_memory_address (Pmode
, addr
);
3113 result
= gen_rtx_MEM (TYPE_MODE (type
), addr
);
3114 set_mem_alias_set (result
, get_varargs_alias_set ());
3119 /* Expand ARGLIST, from a call to __builtin_va_end. */
3122 expand_builtin_va_end (arglist
)
3125 tree valist
= TREE_VALUE (arglist
);
3127 #ifdef EXPAND_BUILTIN_VA_END
3128 valist
= stabilize_va_list (valist
, 0);
3129 EXPAND_BUILTIN_VA_END(arglist
);
3131 /* Evaluate for side effects, if needed. I hate macros that don't
3133 if (TREE_SIDE_EFFECTS (valist
))
3134 expand_expr (valist
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
3140 /* Expand ARGLIST, from a call to __builtin_va_copy. We do this as a
3141 builtin rather than just as an assignment in stdarg.h because of the
3142 nastiness of array-type va_list types. */
3145 expand_builtin_va_copy (arglist
)
3150 dst
= TREE_VALUE (arglist
);
3151 src
= TREE_VALUE (TREE_CHAIN (arglist
));
3153 dst
= stabilize_va_list (dst
, 1);
3154 src
= stabilize_va_list (src
, 0);
3156 if (TREE_CODE (va_list_type_node
) != ARRAY_TYPE
)
3158 t
= build (MODIFY_EXPR
, va_list_type_node
, dst
, src
);
3159 TREE_SIDE_EFFECTS (t
) = 1;
3160 expand_expr (t
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
3164 rtx dstb
, srcb
, size
;
3166 /* Evaluate to pointers. */
3167 dstb
= expand_expr (dst
, NULL_RTX
, Pmode
, EXPAND_NORMAL
);
3168 srcb
= expand_expr (src
, NULL_RTX
, Pmode
, EXPAND_NORMAL
);
3169 size
= expand_expr (TYPE_SIZE_UNIT (va_list_type_node
), NULL_RTX
,
3170 VOIDmode
, EXPAND_NORMAL
);
3172 #ifdef POINTERS_EXTEND_UNSIGNED
3173 if (GET_MODE (dstb
) != Pmode
)
3174 dstb
= convert_memory_address (Pmode
, dstb
);
3176 if (GET_MODE (srcb
) != Pmode
)
3177 srcb
= convert_memory_address (Pmode
, srcb
);
3180 /* "Dereference" to BLKmode memories. */
3181 dstb
= gen_rtx_MEM (BLKmode
, dstb
);
3182 set_mem_alias_set (dstb
, get_alias_set (TREE_TYPE (TREE_TYPE (dst
))));
3183 set_mem_align (dstb
, TYPE_ALIGN (va_list_type_node
));
3184 srcb
= gen_rtx_MEM (BLKmode
, srcb
);
3185 set_mem_alias_set (srcb
, get_alias_set (TREE_TYPE (TREE_TYPE (src
))));
3186 set_mem_align (srcb
, TYPE_ALIGN (va_list_type_node
));
3189 emit_block_move (dstb
, srcb
, size
);
3195 /* Expand a call to one of the builtin functions __builtin_frame_address or
3196 __builtin_return_address. */
3199 expand_builtin_frame_address (exp
)
3202 tree fndecl
= TREE_OPERAND (TREE_OPERAND (exp
, 0), 0);
3203 tree arglist
= TREE_OPERAND (exp
, 1);
3205 /* The argument must be a nonnegative integer constant.
3206 It counts the number of frames to scan up the stack.
3207 The value is the return address saved in that frame. */
3209 /* Warning about missing arg was already issued. */
3211 else if (! host_integerp (TREE_VALUE (arglist
), 1))
3213 if (DECL_FUNCTION_CODE (fndecl
) == BUILT_IN_FRAME_ADDRESS
)
3214 error ("invalid arg to `__builtin_frame_address'");
3216 error ("invalid arg to `__builtin_return_address'");
3222 = expand_builtin_return_addr (DECL_FUNCTION_CODE (fndecl
),
3223 tree_low_cst (TREE_VALUE (arglist
), 1),
3224 hard_frame_pointer_rtx
);
3226 /* Some ports cannot access arbitrary stack frames. */
3229 if (DECL_FUNCTION_CODE (fndecl
) == BUILT_IN_FRAME_ADDRESS
)
3230 warning ("unsupported arg to `__builtin_frame_address'");
3232 warning ("unsupported arg to `__builtin_return_address'");
3236 /* For __builtin_frame_address, return what we've got. */
3237 if (DECL_FUNCTION_CODE (fndecl
) == BUILT_IN_FRAME_ADDRESS
)
3240 if (GET_CODE (tem
) != REG
3241 && ! CONSTANT_P (tem
))
3242 tem
= copy_to_mode_reg (Pmode
, tem
);
3247 /* Expand a call to the alloca builtin, with arguments ARGLIST. Return 0 if
3248 we failed and the caller should emit a normal call, otherwise try to get
3249 the result in TARGET, if convenient. */
3252 expand_builtin_alloca (arglist
, target
)
3259 if (!validate_arglist (arglist
, INTEGER_TYPE
, VOID_TYPE
))
3262 /* Compute the argument. */
3263 op0
= expand_expr (TREE_VALUE (arglist
), NULL_RTX
, VOIDmode
, 0);
3265 /* Allocate the desired space. */
3266 result
= allocate_dynamic_stack_space (op0
, target
, BITS_PER_UNIT
);
3268 #ifdef POINTERS_EXTEND_UNSIGNED
3269 if (GET_MODE (result
) != ptr_mode
)
3270 result
= convert_memory_address (ptr_mode
, result
);
3276 /* Expand a call to the ffs builtin. The arguments are in ARGLIST.
3277 Return 0 if a normal call should be emitted rather than expanding the
3278 function in-line. If convenient, the result should be placed in TARGET.
3279 SUBTARGET may be used as the target for computing one of EXP's operands. */
3282 expand_builtin_ffs (arglist
, target
, subtarget
)
3284 rtx target
, subtarget
;
3287 if (!validate_arglist (arglist
, INTEGER_TYPE
, VOID_TYPE
))
3290 /* Compute the argument. */
3291 op0
= expand_expr (TREE_VALUE (arglist
), subtarget
, VOIDmode
, 0);
3292 /* Compute ffs, into TARGET if possible.
3293 Set TARGET to wherever the result comes back. */
3294 target
= expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist
))),
3295 ffs_optab
, op0
, target
, 1);
3301 /* If the string passed to fputs is a constant and is one character
3302 long, we attempt to transform this call into __builtin_fputc(). */
3305 expand_builtin_fputs (arglist
, ignore
, unlocked
)
3311 tree fn_fputc
= unlocked
? built_in_decls
[BUILT_IN_FPUTC_UNLOCKED
]
3312 : built_in_decls
[BUILT_IN_FPUTC
];
3313 tree fn_fwrite
= unlocked
? built_in_decls
[BUILT_IN_FWRITE_UNLOCKED
]
3314 : built_in_decls
[BUILT_IN_FWRITE
];
3316 /* If the return value is used, or the replacement _DECL isn't
3317 initialized, don't do the transformation. */
3318 if (!ignore
|| !fn_fputc
|| !fn_fwrite
)
3321 /* Verify the arguments in the original call. */
3322 if (!validate_arglist (arglist
, POINTER_TYPE
, POINTER_TYPE
, VOID_TYPE
))
3325 /* Get the length of the string passed to fputs. If the length
3326 can't be determined, punt. */
3327 if (!(len
= c_strlen (TREE_VALUE (arglist
)))
3328 || TREE_CODE (len
) != INTEGER_CST
)
3331 switch (compare_tree_int (len
, 1))
3333 case -1: /* length is 0, delete the call entirely . */
3335 /* Evaluate and ignore the argument in case it has
3337 expand_expr (TREE_VALUE (TREE_CHAIN (arglist
)), const0_rtx
,
3338 VOIDmode
, EXPAND_NORMAL
);
3341 case 0: /* length is 1, call fputc. */
3343 const char *p
= c_getstr (TREE_VALUE (arglist
));
3347 /* New argument list transforming fputs(string, stream) to
3348 fputc(string[0], stream). */
3350 build_tree_list (NULL_TREE
, TREE_VALUE (TREE_CHAIN (arglist
)));
3352 tree_cons (NULL_TREE
, build_int_2 (p
[0], 0), arglist
);
3358 case 1: /* length is greater than 1, call fwrite. */
3360 tree string_arg
= TREE_VALUE (arglist
);
3362 /* New argument list transforming fputs(string, stream) to
3363 fwrite(string, 1, len, stream). */
3364 arglist
= build_tree_list (NULL_TREE
, TREE_VALUE (TREE_CHAIN (arglist
)));
3365 arglist
= tree_cons (NULL_TREE
, len
, arglist
);
3366 arglist
= tree_cons (NULL_TREE
, size_one_node
, arglist
);
3367 arglist
= tree_cons (NULL_TREE
, string_arg
, arglist
);
3375 return expand_expr (build_function_call_expr (fn
, arglist
),
3376 (ignore
? const0_rtx
: NULL_RTX
),
3377 VOIDmode
, EXPAND_NORMAL
);
3380 /* Expand a call to __builtin_expect. We return our argument and emit a
3381 NOTE_INSN_EXPECTED_VALUE note. This is the expansion of __builtin_expect in
3382 a non-jump context. */
3385 expand_builtin_expect (arglist
, target
)
3392 if (arglist
== NULL_TREE
3393 || TREE_CHAIN (arglist
) == NULL_TREE
)
3395 exp
= TREE_VALUE (arglist
);
3396 c
= TREE_VALUE (TREE_CHAIN (arglist
));
3398 if (TREE_CODE (c
) != INTEGER_CST
)
3400 error ("second arg to `__builtin_expect' must be a constant");
3401 c
= integer_zero_node
;
3404 target
= expand_expr (exp
, target
, VOIDmode
, EXPAND_NORMAL
);
3406 /* Don't bother with expected value notes for integral constants. */
3407 if (GET_CODE (target
) != CONST_INT
)
3409 /* We do need to force this into a register so that we can be
3410 moderately sure to be able to correctly interpret the branch
3412 target
= force_reg (GET_MODE (target
), target
);
3414 rtx_c
= expand_expr (c
, NULL_RTX
, GET_MODE (target
), EXPAND_NORMAL
);
3416 note
= emit_note (NULL
, NOTE_INSN_EXPECTED_VALUE
);
3417 NOTE_EXPECTED_VALUE (note
) = gen_rtx_EQ (VOIDmode
, target
, rtx_c
);
3423 /* Like expand_builtin_expect, except do this in a jump context. This is
3424 called from do_jump if the conditional is a __builtin_expect. Return either
3425 a SEQUENCE of insns to emit the jump or NULL if we cannot optimize
3426 __builtin_expect. We need to optimize this at jump time so that machines
3427 like the PowerPC don't turn the test into a SCC operation, and then jump
3428 based on the test being 0/1. */
3431 expand_builtin_expect_jump (exp
, if_false_label
, if_true_label
)
3436 tree arglist
= TREE_OPERAND (exp
, 1);
3437 tree arg0
= TREE_VALUE (arglist
);
3438 tree arg1
= TREE_VALUE (TREE_CHAIN (arglist
));
3441 /* Only handle __builtin_expect (test, 0) and
3442 __builtin_expect (test, 1). */
3443 if (TREE_CODE (TREE_TYPE (arg1
)) == INTEGER_TYPE
3444 && (integer_zerop (arg1
) || integer_onep (arg1
)))
3449 /* If we fail to locate an appropriate conditional jump, we'll
3450 fall back to normal evaluation. Ensure that the expression
3451 can be re-evaluated. */
3452 switch (unsafe_for_reeval (arg0
))
3457 case 1: /* Mildly unsafe. */
3458 arg0
= unsave_expr (arg0
);
3461 case 2: /* Wildly unsafe. */
3465 /* Expand the jump insns. */
3467 do_jump (arg0
, if_false_label
, if_true_label
);
3468 ret
= gen_sequence ();
3471 /* Now that the __builtin_expect has been validated, go through and add
3472 the expect's to each of the conditional jumps. If we run into an
3473 error, just give up and generate the 'safe' code of doing a SCC
3474 operation and then doing a branch on that. */
3475 for (j
= 0; j
< XVECLEN (ret
, 0); j
++)
3477 rtx insn
= XVECEXP (ret
, 0, j
);
3480 if (GET_CODE (insn
) == JUMP_INSN
&& any_condjump_p (insn
)
3481 && (pattern
= pc_set (insn
)) != NULL_RTX
)
3483 rtx ifelse
= SET_SRC (pattern
);
3487 if (GET_CODE (ifelse
) != IF_THEN_ELSE
)
3490 if (GET_CODE (XEXP (ifelse
, 1)) == LABEL_REF
)
3493 label
= XEXP (XEXP (ifelse
, 1), 0);
3495 /* An inverted jump reverses the probabilities. */
3496 else if (GET_CODE (XEXP (ifelse
, 2)) == LABEL_REF
)
3499 label
= XEXP (XEXP (ifelse
, 2), 0);
3501 /* We shouldn't have to worry about conditional returns during
3502 the expansion stage, but handle it gracefully anyway. */
3503 else if (GET_CODE (XEXP (ifelse
, 1)) == RETURN
)
3508 /* An inverted return reverses the probabilities. */
3509 else if (GET_CODE (XEXP (ifelse
, 2)) == RETURN
)
3517 /* If the test is expected to fail, reverse the
3519 if (integer_zerop (arg1
))
3522 /* If we are jumping to the false label, reverse the
3524 if (label
== NULL_RTX
)
3525 ; /* conditional return */
3526 else if (label
== if_false_label
)
3528 else if (label
!= if_true_label
)
3532 predict_insn_def (insn
, PRED_BUILTIN_EXPECT
, taken
);
3536 /* If no jumps were modified, fail and do __builtin_expect the normal
3545 /* Expand an expression EXP that calls a built-in function,
3546 with result going to TARGET if that's convenient
3547 (and in mode MODE if that's convenient).
3548 SUBTARGET may be used as the target for computing one of EXP's operands.
3549 IGNORE is nonzero if the value is to be ignored. */
3552 expand_builtin (exp
, target
, subtarget
, mode
, ignore
)
3556 enum machine_mode mode
;
3559 tree fndecl
= TREE_OPERAND (TREE_OPERAND (exp
, 0), 0);
3560 tree arglist
= TREE_OPERAND (exp
, 1);
3561 enum built_in_function fcode
= DECL_FUNCTION_CODE (fndecl
);
3563 if (DECL_BUILT_IN_CLASS (fndecl
) == BUILT_IN_MD
)
3564 return (*targetm
.expand_builtin
) (exp
, target
, subtarget
, mode
, ignore
);
3566 /* When not optimizing, generate calls to library functions for a certain
3568 if (!optimize
&& !CALLED_AS_BUILT_IN (fndecl
))
3574 case BUILT_IN_SQRTF
:
3575 case BUILT_IN_SQRTL
:
3576 case BUILT_IN_MEMSET
:
3577 case BUILT_IN_MEMCPY
:
3578 case BUILT_IN_MEMCMP
:
3580 case BUILT_IN_BZERO
:
3581 case BUILT_IN_INDEX
:
3582 case BUILT_IN_RINDEX
:
3583 case BUILT_IN_STRCHR
:
3584 case BUILT_IN_STRRCHR
:
3585 case BUILT_IN_STRLEN
:
3586 case BUILT_IN_STRCPY
:
3587 case BUILT_IN_STRNCPY
:
3588 case BUILT_IN_STRNCMP
:
3589 case BUILT_IN_STRSTR
:
3590 case BUILT_IN_STRPBRK
:
3591 case BUILT_IN_STRCAT
:
3592 case BUILT_IN_STRNCAT
:
3593 case BUILT_IN_STRSPN
:
3594 case BUILT_IN_STRCSPN
:
3595 case BUILT_IN_STRCMP
:
3597 case BUILT_IN_PUTCHAR
:
3599 case BUILT_IN_PRINTF
:
3600 case BUILT_IN_FPUTC
:
3601 case BUILT_IN_FPUTS
:
3602 case BUILT_IN_FWRITE
:
3603 case BUILT_IN_PUTCHAR_UNLOCKED
:
3604 case BUILT_IN_PUTS_UNLOCKED
:
3605 case BUILT_IN_PRINTF_UNLOCKED
:
3606 case BUILT_IN_FPUTC_UNLOCKED
:
3607 case BUILT_IN_FPUTS_UNLOCKED
:
3608 case BUILT_IN_FWRITE_UNLOCKED
:
3609 return expand_call (exp
, target
, ignore
);
3619 case BUILT_IN_LLABS
:
3620 case BUILT_IN_IMAXABS
:
3622 case BUILT_IN_FABSF
:
3623 case BUILT_IN_FABSL
:
3624 /* build_function_call changes these into ABS_EXPR. */
3628 case BUILT_IN_CONJF
:
3629 case BUILT_IN_CONJL
:
3630 case BUILT_IN_CREAL
:
3631 case BUILT_IN_CREALF
:
3632 case BUILT_IN_CREALL
:
3633 case BUILT_IN_CIMAG
:
3634 case BUILT_IN_CIMAGF
:
3635 case BUILT_IN_CIMAGL
:
3636 /* expand_tree_builtin changes these into CONJ_EXPR, REALPART_EXPR
3637 and IMAGPART_EXPR. */
3646 /* Treat these like sqrt only if unsafe math optimizations are allowed,
3647 because of possible accuracy problems. */
3648 if (! flag_unsafe_math_optimizations
)
3651 case BUILT_IN_SQRTF
:
3652 case BUILT_IN_SQRTL
:
3653 target
= expand_builtin_mathfn (exp
, target
, subtarget
);
3661 case BUILT_IN_APPLY_ARGS
:
3662 return expand_builtin_apply_args ();
3664 /* __builtin_apply (FUNCTION, ARGUMENTS, ARGSIZE) invokes
3665 FUNCTION with a copy of the parameters described by
3666 ARGUMENTS, and ARGSIZE. It returns a block of memory
3667 allocated on the stack into which is stored all the registers
3668 that might possibly be used for returning the result of a
3669 function. ARGUMENTS is the value returned by
3670 __builtin_apply_args. ARGSIZE is the number of bytes of
3671 arguments that must be copied. ??? How should this value be
3672 computed? We'll also need a safe worst case value for varargs
3674 case BUILT_IN_APPLY
:
3675 if (!validate_arglist (arglist
, POINTER_TYPE
,
3676 POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
)
3677 && !validate_arglist (arglist
, REFERENCE_TYPE
,
3678 POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
3686 for (t
= arglist
, i
= 0; t
; t
= TREE_CHAIN (t
), i
++)
3687 ops
[i
] = expand_expr (TREE_VALUE (t
), NULL_RTX
, VOIDmode
, 0);
3689 return expand_builtin_apply (ops
[0], ops
[1], ops
[2]);
3692 /* __builtin_return (RESULT) causes the function to return the
3693 value described by RESULT. RESULT is address of the block of
3694 memory returned by __builtin_apply. */
3695 case BUILT_IN_RETURN
:
3696 if (validate_arglist (arglist
, POINTER_TYPE
, VOID_TYPE
))
3697 expand_builtin_return (expand_expr (TREE_VALUE (arglist
),
3698 NULL_RTX
, VOIDmode
, 0));
3701 case BUILT_IN_SAVEREGS
:
3702 return expand_builtin_saveregs ();
3704 case BUILT_IN_ARGS_INFO
:
3705 return expand_builtin_args_info (exp
);
3707 /* Return the address of the first anonymous stack arg. */
3708 case BUILT_IN_NEXT_ARG
:
3709 return expand_builtin_next_arg (arglist
);
3711 case BUILT_IN_CLASSIFY_TYPE
:
3712 return expand_builtin_classify_type (arglist
);
3714 case BUILT_IN_CONSTANT_P
:
3715 return expand_builtin_constant_p (exp
);
3717 case BUILT_IN_FRAME_ADDRESS
:
3718 case BUILT_IN_RETURN_ADDRESS
:
3719 return expand_builtin_frame_address (exp
);
3721 /* Returns the address of the area where the structure is returned.
3723 case BUILT_IN_AGGREGATE_INCOMING_ADDRESS
:
3725 || ! AGGREGATE_TYPE_P (TREE_TYPE (TREE_TYPE (current_function_decl
)))
3726 || GET_CODE (DECL_RTL (DECL_RESULT (current_function_decl
))) != MEM
)
3729 return XEXP (DECL_RTL (DECL_RESULT (current_function_decl
)), 0);
3731 case BUILT_IN_ALLOCA
:
3732 target
= expand_builtin_alloca (arglist
, target
);
3738 target
= expand_builtin_ffs (arglist
, target
, subtarget
);
3743 case BUILT_IN_STRLEN
:
3744 target
= expand_builtin_strlen (exp
, target
);
3749 case BUILT_IN_STRCPY
:
3750 target
= expand_builtin_strcpy (exp
, target
, mode
);
3755 case BUILT_IN_STRNCPY
:
3756 target
= expand_builtin_strncpy (arglist
, target
, mode
);
3761 case BUILT_IN_STRCAT
:
3762 target
= expand_builtin_strcat (arglist
, target
, mode
);
3767 case BUILT_IN_STRNCAT
:
3768 target
= expand_builtin_strncat (arglist
, target
, mode
);
3773 case BUILT_IN_STRSPN
:
3774 target
= expand_builtin_strspn (arglist
, target
, mode
);
3779 case BUILT_IN_STRCSPN
:
3780 target
= expand_builtin_strcspn (arglist
, target
, mode
);
3785 case BUILT_IN_STRSTR
:
3786 target
= expand_builtin_strstr (arglist
, target
, mode
);
3791 case BUILT_IN_STRPBRK
:
3792 target
= expand_builtin_strpbrk (arglist
, target
, mode
);
3797 case BUILT_IN_INDEX
:
3798 case BUILT_IN_STRCHR
:
3799 target
= expand_builtin_strchr (arglist
, target
, mode
);
3804 case BUILT_IN_RINDEX
:
3805 case BUILT_IN_STRRCHR
:
3806 target
= expand_builtin_strrchr (arglist
, target
, mode
);
3811 case BUILT_IN_MEMCPY
:
3812 target
= expand_builtin_memcpy (arglist
, target
, mode
);
3817 case BUILT_IN_MEMSET
:
3818 target
= expand_builtin_memset (exp
, target
, mode
);
3823 case BUILT_IN_BZERO
:
3824 target
= expand_builtin_bzero (exp
);
3829 case BUILT_IN_STRCMP
:
3830 target
= expand_builtin_strcmp (exp
, target
, mode
);
3835 case BUILT_IN_STRNCMP
:
3836 target
= expand_builtin_strncmp (exp
, target
, mode
);
3842 case BUILT_IN_MEMCMP
:
3843 target
= expand_builtin_memcmp (exp
, arglist
, target
, mode
);
3848 case BUILT_IN_SETJMP
:
3849 target
= expand_builtin_setjmp (arglist
, target
);
3854 /* __builtin_longjmp is passed a pointer to an array of five words.
3855 It's similar to the C library longjmp function but works with
3856 __builtin_setjmp above. */
3857 case BUILT_IN_LONGJMP
:
3858 if (!validate_arglist (arglist
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
3862 rtx buf_addr
= expand_expr (TREE_VALUE (arglist
), subtarget
,
3864 rtx value
= expand_expr (TREE_VALUE (TREE_CHAIN (arglist
)),
3865 NULL_RTX
, VOIDmode
, 0);
3867 if (value
!= const1_rtx
)
3869 error ("__builtin_longjmp second argument must be 1");
3873 expand_builtin_longjmp (buf_addr
, value
);
3880 emit_insn (gen_trap ());
3883 error ("__builtin_trap not supported by this target");
3887 case BUILT_IN_PUTCHAR
:
3889 case BUILT_IN_FPUTC
:
3890 case BUILT_IN_FWRITE
:
3891 case BUILT_IN_PUTCHAR_UNLOCKED
:
3892 case BUILT_IN_PUTS_UNLOCKED
:
3893 case BUILT_IN_FPUTC_UNLOCKED
:
3894 case BUILT_IN_FWRITE_UNLOCKED
:
3896 case BUILT_IN_FPUTS
:
3897 target
= expand_builtin_fputs (arglist
, ignore
,/*unlocked=*/ 0);
3901 case BUILT_IN_FPUTS_UNLOCKED
:
3902 target
= expand_builtin_fputs (arglist
, ignore
,/*unlocked=*/ 1);
3907 /* Various hooks for the DWARF 2 __throw routine. */
3908 case BUILT_IN_UNWIND_INIT
:
3909 expand_builtin_unwind_init ();
3911 case BUILT_IN_DWARF_CFA
:
3912 return virtual_cfa_rtx
;
3913 #ifdef DWARF2_UNWIND_INFO
3914 case BUILT_IN_DWARF_FP_REGNUM
:
3915 return expand_builtin_dwarf_fp_regnum ();
3916 case BUILT_IN_INIT_DWARF_REG_SIZES
:
3917 expand_builtin_init_dwarf_reg_sizes (TREE_VALUE (arglist
));
3920 case BUILT_IN_FROB_RETURN_ADDR
:
3921 return expand_builtin_frob_return_addr (TREE_VALUE (arglist
));
3922 case BUILT_IN_EXTRACT_RETURN_ADDR
:
3923 return expand_builtin_extract_return_addr (TREE_VALUE (arglist
));
3924 case BUILT_IN_EH_RETURN
:
3925 expand_builtin_eh_return (TREE_VALUE (arglist
),
3926 TREE_VALUE (TREE_CHAIN (arglist
)));
3928 #ifdef EH_RETURN_DATA_REGNO
3929 case BUILT_IN_EH_RETURN_DATA_REGNO
:
3930 return expand_builtin_eh_return_data_regno (arglist
);
3932 case BUILT_IN_VARARGS_START
:
3933 return expand_builtin_va_start (0, arglist
);
3934 case BUILT_IN_STDARG_START
:
3935 return expand_builtin_va_start (1, arglist
);
3936 case BUILT_IN_VA_END
:
3937 return expand_builtin_va_end (arglist
);
3938 case BUILT_IN_VA_COPY
:
3939 return expand_builtin_va_copy (arglist
);
3940 case BUILT_IN_EXPECT
:
3941 return expand_builtin_expect (arglist
, target
);
3942 case BUILT_IN_PREFETCH
:
3943 expand_builtin_prefetch (arglist
);
3947 default: /* just do library call, if unknown builtin */
3948 error ("built-in function `%s' not currently supported",
3949 IDENTIFIER_POINTER (DECL_NAME (fndecl
)));
3952 /* The switch statement above can drop through to cause the function
3953 to be called normally. */
3954 return expand_call (exp
, target
, ignore
);
3957 /* Fold a call to __builtin_constant_p, if we know it will evaluate to a
3958 constant. ARGLIST is the argument list of the call. */
3961 fold_builtin_constant_p (arglist
)
3967 arglist
= TREE_VALUE (arglist
);
3969 /* We return 1 for a numeric type that's known to be a constant
3970 value at compile-time or for an aggregate type that's a
3971 literal constant. */
3972 STRIP_NOPS (arglist
);
3974 /* If we know this is a constant, emit the constant of one. */
3975 if (TREE_CODE_CLASS (TREE_CODE (arglist
)) == 'c'
3976 || (TREE_CODE (arglist
) == CONSTRUCTOR
3977 && TREE_CONSTANT (arglist
))
3978 || (TREE_CODE (arglist
) == ADDR_EXPR
3979 && TREE_CODE (TREE_OPERAND (arglist
, 0)) == STRING_CST
))
3980 return integer_one_node
;
3982 /* If we aren't going to be running CSE or this expression
3983 has side effects, show we don't know it to be a constant.
3984 Likewise if it's a pointer or aggregate type since in those
3985 case we only want literals, since those are only optimized
3986 when generating RTL, not later.
3987 And finally, if we are compiling an initializer, not code, we
3988 need to return a definite result now; there's not going to be any
3989 more optimization done. */
3990 if (TREE_SIDE_EFFECTS (arglist
) || cse_not_expected
3991 || AGGREGATE_TYPE_P (TREE_TYPE (arglist
))
3992 || POINTER_TYPE_P (TREE_TYPE (arglist
))
3994 return integer_zero_node
;
3999 /* Fold a call to __builtin_classify_type. */
4002 fold_builtin_classify_type (arglist
)
4006 return build_int_2 (no_type_class
, 0);
4008 return build_int_2 (type_to_class (TREE_TYPE (TREE_VALUE (arglist
))), 0);
4011 /* Used by constant folding to eliminate some builtin calls early. EXP is
4012 the CALL_EXPR of a call to a builtin function. */
4018 tree fndecl
= TREE_OPERAND (TREE_OPERAND (exp
, 0), 0);
4019 tree arglist
= TREE_OPERAND (exp
, 1);
4020 enum built_in_function fcode
= DECL_FUNCTION_CODE (fndecl
);
4022 if (DECL_BUILT_IN_CLASS (fndecl
) == BUILT_IN_MD
)
4027 case BUILT_IN_CONSTANT_P
:
4028 return fold_builtin_constant_p (arglist
);
4030 case BUILT_IN_CLASSIFY_TYPE
:
4031 return fold_builtin_classify_type (arglist
);
4033 case BUILT_IN_STRLEN
:
4034 if (validate_arglist (arglist
, POINTER_TYPE
, VOID_TYPE
))
4036 tree len
= c_strlen (TREE_VALUE (arglist
));
4050 build_function_call_expr (fn
, arglist
)
4055 call_expr
= build1 (ADDR_EXPR
, build_pointer_type (TREE_TYPE (fn
)), fn
);
4056 call_expr
= build (CALL_EXPR
, TREE_TYPE (TREE_TYPE (fn
)),
4057 call_expr
, arglist
);
4058 TREE_SIDE_EFFECTS (call_expr
) = 1;
4059 return fold (call_expr
);
4062 /* This function validates the types of a function call argument list
4063 represented as a tree chain of parameters against a specified list
4064 of tree_codes. If the last specifier is a 0, that represents an
4065 ellipses, otherwise the last specifier must be a VOID_TYPE. */
4068 validate_arglist
VPARAMS ((tree arglist
, ...))
4070 enum tree_code code
;
4073 VA_OPEN (ap
, arglist
);
4074 VA_FIXEDARG (ap
, tree
, arglist
);
4077 code
= va_arg (ap
, enum tree_code
);
4081 /* This signifies an ellipses, any further arguments are all ok. */
4085 /* This signifies an endlink, if no arguments remain, return
4086 true, otherwise return false. */
4090 /* If no parameters remain or the parameter's code does not
4091 match the specified code, return false. Otherwise continue
4092 checking any remaining arguments. */
4093 if (arglist
== 0 || code
!= TREE_CODE (TREE_TYPE (TREE_VALUE (arglist
))))
4097 arglist
= TREE_CHAIN (arglist
);
4100 /* We need gotos here since we can only have one VA_CLOSE in a
4108 /* Default version of target-specific builtin setup that does nothing. */
4111 default_init_builtins ()
4115 /* Default target-specific builtin expander that does nothing. */
4118 default_expand_builtin (exp
, target
, subtarget
, mode
, ignore
)
4119 tree exp ATTRIBUTE_UNUSED
;
4120 rtx target ATTRIBUTE_UNUSED
;
4121 rtx subtarget ATTRIBUTE_UNUSED
;
4122 enum machine_mode mode ATTRIBUTE_UNUSED
;
4123 int ignore ATTRIBUTE_UNUSED
;