1 /* Expand builtin functions.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
30 #include "hard-reg-set.h"
33 #include "insn-config.h"
39 #include "typeclass.h"
45 #define CALLED_AS_BUILT_IN(NODE) \
46 (!strncmp (IDENTIFIER_POINTER (DECL_NAME (NODE)), "__builtin_", 10))
48 /* Register mappings for target machines without register windows. */
49 #ifndef INCOMING_REGNO
50 #define INCOMING_REGNO(OUT) (OUT)
52 #ifndef OUTGOING_REGNO
53 #define OUTGOING_REGNO(IN) (IN)
56 #ifndef PAD_VARARGS_DOWN
57 #define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
60 /* Define the names of the builtin function types and codes. */
61 const char *const built_in_class_names
[4]
62 = {"NOT_BUILT_IN", "BUILT_IN_FRONTEND", "BUILT_IN_MD", "BUILT_IN_NORMAL"};
64 #define DEF_BUILTIN(X, N, C, T, LT, B, F, NA) STRINGX(X),
65 const char *const built_in_names
[(int) END_BUILTINS
] =
67 #include "builtins.def"
71 /* Setup an array of _DECL trees, make sure each element is
72 initialized to NULL_TREE. */
73 tree built_in_decls
[(int) END_BUILTINS
];
75 tree (*lang_type_promotes_to
) PARAMS ((tree
));
77 static int get_pointer_alignment
PARAMS ((tree
, unsigned int));
78 static tree c_strlen
PARAMS ((tree
));
79 static const char *c_getstr
PARAMS ((tree
));
80 static rtx c_readstr
PARAMS ((const char *,
82 static int target_char_cast
PARAMS ((tree
, char *));
83 static rtx get_memory_rtx
PARAMS ((tree
));
84 static int apply_args_size
PARAMS ((void));
85 static int apply_result_size
PARAMS ((void));
86 #if defined (HAVE_untyped_call) || defined (HAVE_untyped_return)
87 static rtx result_vector
PARAMS ((int, rtx
));
89 static rtx expand_builtin_setjmp
PARAMS ((tree
, rtx
));
90 static void expand_builtin_prefetch
PARAMS ((tree
));
91 static rtx expand_builtin_apply_args
PARAMS ((void));
92 static rtx expand_builtin_apply_args_1
PARAMS ((void));
93 static rtx expand_builtin_apply
PARAMS ((rtx
, rtx
, rtx
));
94 static void expand_builtin_return
PARAMS ((rtx
));
95 static enum type_class type_to_class
PARAMS ((tree
));
96 static rtx expand_builtin_classify_type
PARAMS ((tree
));
97 static rtx expand_builtin_mathfn
PARAMS ((tree
, rtx
, rtx
));
98 static rtx expand_builtin_constant_p
PARAMS ((tree
));
99 static rtx expand_builtin_args_info
PARAMS ((tree
));
100 static rtx expand_builtin_next_arg
PARAMS ((tree
));
101 static rtx expand_builtin_va_start
PARAMS ((int, tree
));
102 static rtx expand_builtin_va_end
PARAMS ((tree
));
103 static rtx expand_builtin_va_copy
PARAMS ((tree
));
105 static rtx expand_builtin_memcmp
PARAMS ((tree
, tree
, rtx
));
107 static rtx expand_builtin_strcmp
PARAMS ((tree
, rtx
,
109 static rtx expand_builtin_strncmp
PARAMS ((tree
, rtx
,
111 static rtx builtin_memcpy_read_str
PARAMS ((PTR
, HOST_WIDE_INT
,
113 static rtx expand_builtin_strcat
PARAMS ((tree
, rtx
,
115 static rtx expand_builtin_strncat
PARAMS ((tree
, rtx
,
117 static rtx expand_builtin_strspn
PARAMS ((tree
, rtx
,
119 static rtx expand_builtin_strcspn
PARAMS ((tree
, rtx
,
121 static rtx expand_builtin_memcpy
PARAMS ((tree
));
122 static rtx expand_builtin_strcpy
PARAMS ((tree
));
123 static rtx builtin_strncpy_read_str
PARAMS ((PTR
, HOST_WIDE_INT
,
125 static rtx expand_builtin_strncpy
PARAMS ((tree
, rtx
,
127 static rtx builtin_memset_read_str
PARAMS ((PTR
, HOST_WIDE_INT
,
129 static rtx expand_builtin_memset
PARAMS ((tree
));
130 static rtx expand_builtin_bzero
PARAMS ((tree
));
131 static rtx expand_builtin_strlen
PARAMS ((tree
, rtx
));
132 static rtx expand_builtin_strstr
PARAMS ((tree
, rtx
,
134 static rtx expand_builtin_strpbrk
PARAMS ((tree
, rtx
,
136 static rtx expand_builtin_strchr
PARAMS ((tree
, rtx
,
138 static rtx expand_builtin_strrchr
PARAMS ((tree
, rtx
,
140 static rtx expand_builtin_alloca
PARAMS ((tree
, rtx
));
141 static rtx expand_builtin_ffs
PARAMS ((tree
, rtx
, rtx
));
142 static rtx expand_builtin_frame_address
PARAMS ((tree
));
143 static rtx expand_builtin_fputs
PARAMS ((tree
, int));
144 static tree stabilize_va_list
PARAMS ((tree
, int));
145 static rtx expand_builtin_expect
PARAMS ((tree
, rtx
));
146 static tree fold_builtin_constant_p
PARAMS ((tree
));
147 static tree fold_builtin_classify_type
PARAMS ((tree
));
148 static tree build_function_call_expr
PARAMS ((tree
, tree
));
149 static int validate_arglist
PARAMS ((tree
, ...));
151 /* Return the alignment in bits of EXP, a pointer valued expression.
152 But don't return more than MAX_ALIGN no matter what.
153 The alignment returned is, by default, the alignment of the thing that
154 EXP points to. If it is not a POINTER_TYPE, 0 is returned.
156 Otherwise, look at the expression to see if we can do better, i.e., if the
157 expression is actually pointing at an object whose alignment is tighter. */
160 get_pointer_alignment (exp
, max_align
)
162 unsigned int max_align
;
164 unsigned int align
, inner
;
166 if (TREE_CODE (TREE_TYPE (exp
)) != POINTER_TYPE
)
169 align
= TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp
)));
170 align
= MIN (align
, max_align
);
174 switch (TREE_CODE (exp
))
178 case NON_LVALUE_EXPR
:
179 exp
= TREE_OPERAND (exp
, 0);
180 if (TREE_CODE (TREE_TYPE (exp
)) != POINTER_TYPE
)
183 inner
= TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp
)));
184 align
= MIN (inner
, max_align
);
188 /* If sum of pointer + int, restrict our maximum alignment to that
189 imposed by the integer. If not, we can't do any better than
191 if (! host_integerp (TREE_OPERAND (exp
, 1), 1))
194 while (((tree_low_cst (TREE_OPERAND (exp
, 1), 1))
195 & (max_align
/ BITS_PER_UNIT
- 1))
199 exp
= TREE_OPERAND (exp
, 0);
203 /* See what we are pointing at and look at its alignment. */
204 exp
= TREE_OPERAND (exp
, 0);
205 if (TREE_CODE (exp
) == FUNCTION_DECL
)
206 align
= FUNCTION_BOUNDARY
;
207 else if (DECL_P (exp
))
208 align
= DECL_ALIGN (exp
);
209 #ifdef CONSTANT_ALIGNMENT
210 else if (TREE_CODE_CLASS (TREE_CODE (exp
)) == 'c')
211 align
= CONSTANT_ALIGNMENT (exp
, align
);
213 return MIN (align
, max_align
);
221 /* Compute the length of a C string. TREE_STRING_LENGTH is not the right
222 way, because it could contain a zero byte in the middle.
223 TREE_STRING_LENGTH is the size of the character array, not the string.
225 The value returned is of type `ssizetype'.
227 Unfortunately, string_constant can't access the values of const char
228 arrays with initializers, so neither can we do so here. */
235 HOST_WIDE_INT offset
;
239 src
= string_constant (src
, &offset_node
);
243 max
= TREE_STRING_LENGTH (src
) - 1;
244 ptr
= TREE_STRING_POINTER (src
);
246 if (offset_node
&& TREE_CODE (offset_node
) != INTEGER_CST
)
248 /* If the string has an internal zero byte (e.g., "foo\0bar"), we can't
249 compute the offset to the following null if we don't know where to
250 start searching for it. */
253 for (i
= 0; i
< max
; i
++)
257 /* We don't know the starting offset, but we do know that the string
258 has no internal zero bytes. We can assume that the offset falls
259 within the bounds of the string; otherwise, the programmer deserves
260 what he gets. Subtract the offset from the length of the string,
261 and return that. This would perhaps not be valid if we were dealing
262 with named arrays in addition to literal string constants. */
264 return size_diffop (size_int (max
), offset_node
);
267 /* We have a known offset into the string. Start searching there for
268 a null character if we can represent it as a single HOST_WIDE_INT. */
269 if (offset_node
== 0)
271 else if (! host_integerp (offset_node
, 0))
274 offset
= tree_low_cst (offset_node
, 0);
276 /* If the offset is known to be out of bounds, warn, and call strlen at
278 if (offset
< 0 || offset
> max
)
280 warning ("offset outside bounds of constant string");
284 /* Use strlen to search for the first zero byte. Since any strings
285 constructed with build_string will have nulls appended, we win even
286 if we get handed something like (char[4])"abcd".
288 Since OFFSET is our starting index into the string, no further
289 calculation is needed. */
290 return ssize_int (strlen (ptr
+ offset
));
293 /* Return a char pointer for a C string if it is a string constant
294 or sum of string constant and integer constant. */
302 src
= string_constant (src
, &offset_node
);
306 if (offset_node
== 0)
307 return TREE_STRING_POINTER (src
);
308 else if (!host_integerp (offset_node
, 1)
309 || compare_tree_int (offset_node
, TREE_STRING_LENGTH (src
) - 1) > 0)
312 return TREE_STRING_POINTER (src
) + tree_low_cst (offset_node
, 1);
315 /* Return a CONST_INT or CONST_DOUBLE corresponding to target reading
316 GET_MODE_BITSIZE (MODE) bits from string constant STR. */
319 c_readstr (str
, mode
)
321 enum machine_mode mode
;
327 if (GET_MODE_CLASS (mode
) != MODE_INT
)
332 for (i
= 0; i
< GET_MODE_SIZE (mode
); i
++)
335 if (WORDS_BIG_ENDIAN
)
336 j
= GET_MODE_SIZE (mode
) - i
- 1;
337 if (BYTES_BIG_ENDIAN
!= WORDS_BIG_ENDIAN
338 && GET_MODE_SIZE (mode
) > UNITS_PER_WORD
)
339 j
= j
+ UNITS_PER_WORD
- 2 * (j
% UNITS_PER_WORD
) - 1;
341 if (j
> 2 * HOST_BITS_PER_WIDE_INT
)
344 ch
= (unsigned char) str
[i
];
345 c
[j
/ HOST_BITS_PER_WIDE_INT
] |= ch
<< (j
% HOST_BITS_PER_WIDE_INT
);
347 return immed_double_const (c
[0], c
[1], mode
);
350 /* Cast a target constant CST to target CHAR and if that value fits into
351 host char type, return zero and put that value into variable pointed by
355 target_char_cast (cst
, p
)
359 unsigned HOST_WIDE_INT val
, hostval
;
361 if (!host_integerp (cst
, 1)
362 || CHAR_TYPE_SIZE
> HOST_BITS_PER_WIDE_INT
)
365 val
= tree_low_cst (cst
, 1);
366 if (CHAR_TYPE_SIZE
< HOST_BITS_PER_WIDE_INT
)
367 val
&= (((unsigned HOST_WIDE_INT
) 1) << CHAR_TYPE_SIZE
) - 1;
370 if (HOST_BITS_PER_CHAR
< HOST_BITS_PER_WIDE_INT
)
371 hostval
&= (((unsigned HOST_WIDE_INT
) 1) << HOST_BITS_PER_CHAR
) - 1;
380 /* Given TEM, a pointer to a stack frame, follow the dynamic chain COUNT
381 times to get the address of either a higher stack frame, or a return
382 address located within it (depending on FNDECL_CODE). */
385 expand_builtin_return_addr (fndecl_code
, count
, tem
)
386 enum built_in_function fndecl_code
;
392 /* Some machines need special handling before we can access
393 arbitrary frames. For example, on the sparc, we must first flush
394 all register windows to the stack. */
395 #ifdef SETUP_FRAME_ADDRESSES
397 SETUP_FRAME_ADDRESSES ();
400 /* On the sparc, the return address is not in the frame, it is in a
401 register. There is no way to access it off of the current frame
402 pointer, but it can be accessed off the previous frame pointer by
403 reading the value from the register window save area. */
404 #ifdef RETURN_ADDR_IN_PREVIOUS_FRAME
405 if (fndecl_code
== BUILT_IN_RETURN_ADDRESS
)
409 /* Scan back COUNT frames to the specified frame. */
410 for (i
= 0; i
< count
; i
++)
412 /* Assume the dynamic chain pointer is in the word that the
413 frame address points to, unless otherwise specified. */
414 #ifdef DYNAMIC_CHAIN_ADDRESS
415 tem
= DYNAMIC_CHAIN_ADDRESS (tem
);
417 tem
= memory_address (Pmode
, tem
);
418 tem
= gen_rtx_MEM (Pmode
, tem
);
419 set_mem_alias_set (tem
, get_frame_alias_set ());
420 tem
= copy_to_reg (tem
);
423 /* For __builtin_frame_address, return what we've got. */
424 if (fndecl_code
== BUILT_IN_FRAME_ADDRESS
)
427 /* For __builtin_return_address, Get the return address from that
429 #ifdef RETURN_ADDR_RTX
430 tem
= RETURN_ADDR_RTX (count
, tem
);
432 tem
= memory_address (Pmode
,
433 plus_constant (tem
, GET_MODE_SIZE (Pmode
)));
434 tem
= gen_rtx_MEM (Pmode
, tem
);
435 set_mem_alias_set (tem
, get_frame_alias_set ());
440 /* Alias set used for setjmp buffer. */
441 static HOST_WIDE_INT setjmp_alias_set
= -1;
443 /* Construct the leading half of a __builtin_setjmp call. Control will
444 return to RECEIVER_LABEL. This is used directly by sjlj exception
448 expand_builtin_setjmp_setup (buf_addr
, receiver_label
)
452 enum machine_mode sa_mode
= STACK_SAVEAREA_MODE (SAVE_NONLOCAL
);
456 if (setjmp_alias_set
== -1)
457 setjmp_alias_set
= new_alias_set ();
459 #ifdef POINTERS_EXTEND_UNSIGNED
460 if (GET_MODE (buf_addr
) != Pmode
)
461 buf_addr
= convert_memory_address (Pmode
, buf_addr
);
464 buf_addr
= force_reg (Pmode
, force_operand (buf_addr
, NULL_RTX
));
468 /* We store the frame pointer and the address of receiver_label in
469 the buffer and use the rest of it for the stack save area, which
470 is machine-dependent. */
472 #ifndef BUILTIN_SETJMP_FRAME_VALUE
473 #define BUILTIN_SETJMP_FRAME_VALUE virtual_stack_vars_rtx
476 mem
= gen_rtx_MEM (Pmode
, buf_addr
);
477 set_mem_alias_set (mem
, setjmp_alias_set
);
478 emit_move_insn (mem
, BUILTIN_SETJMP_FRAME_VALUE
);
480 mem
= gen_rtx_MEM (Pmode
, plus_constant (buf_addr
, GET_MODE_SIZE (Pmode
))),
481 set_mem_alias_set (mem
, setjmp_alias_set
);
483 emit_move_insn (validize_mem (mem
),
484 force_reg (Pmode
, gen_rtx_LABEL_REF (Pmode
, receiver_label
)));
486 stack_save
= gen_rtx_MEM (sa_mode
,
487 plus_constant (buf_addr
,
488 2 * GET_MODE_SIZE (Pmode
)));
489 set_mem_alias_set (stack_save
, setjmp_alias_set
);
490 emit_stack_save (SAVE_NONLOCAL
, &stack_save
, NULL_RTX
);
492 /* If there is further processing to do, do it. */
493 #ifdef HAVE_builtin_setjmp_setup
494 if (HAVE_builtin_setjmp_setup
)
495 emit_insn (gen_builtin_setjmp_setup (buf_addr
));
498 /* Tell optimize_save_area_alloca that extra work is going to
499 need to go on during alloca. */
500 current_function_calls_setjmp
= 1;
502 /* Set this so all the registers get saved in our frame; we need to be
503 able to copy the saved values for any registers from frames we unwind. */
504 current_function_has_nonlocal_label
= 1;
507 /* Construct the trailing part of a __builtin_setjmp call.
508 This is used directly by sjlj exception handling code. */
511 expand_builtin_setjmp_receiver (receiver_label
)
512 rtx receiver_label ATTRIBUTE_UNUSED
;
514 /* Clobber the FP when we get here, so we have to make sure it's
515 marked as used by this function. */
516 emit_insn (gen_rtx_USE (VOIDmode
, hard_frame_pointer_rtx
));
518 /* Mark the static chain as clobbered here so life information
519 doesn't get messed up for it. */
520 emit_insn (gen_rtx_CLOBBER (VOIDmode
, static_chain_rtx
));
522 /* Now put in the code to restore the frame pointer, and argument
523 pointer, if needed. The code below is from expand_end_bindings
524 in stmt.c; see detailed documentation there. */
525 #ifdef HAVE_nonlocal_goto
526 if (! HAVE_nonlocal_goto
)
528 emit_move_insn (virtual_stack_vars_rtx
, hard_frame_pointer_rtx
);
530 #if ARG_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM
531 if (fixed_regs
[ARG_POINTER_REGNUM
])
533 #ifdef ELIMINABLE_REGS
535 static const struct elims
{const int from
, to
;} elim_regs
[] = ELIMINABLE_REGS
;
537 for (i
= 0; i
< ARRAY_SIZE (elim_regs
); i
++)
538 if (elim_regs
[i
].from
== ARG_POINTER_REGNUM
539 && elim_regs
[i
].to
== HARD_FRAME_POINTER_REGNUM
)
542 if (i
== ARRAY_SIZE (elim_regs
))
545 /* Now restore our arg pointer from the address at which it
546 was saved in our stack frame. */
547 emit_move_insn (virtual_incoming_args_rtx
,
548 copy_to_reg (get_arg_pointer_save_area (cfun
)));
553 #ifdef HAVE_builtin_setjmp_receiver
554 if (HAVE_builtin_setjmp_receiver
)
555 emit_insn (gen_builtin_setjmp_receiver (receiver_label
));
558 #ifdef HAVE_nonlocal_goto_receiver
559 if (HAVE_nonlocal_goto_receiver
)
560 emit_insn (gen_nonlocal_goto_receiver ());
565 /* @@@ This is a kludge. Not all machine descriptions define a blockage
566 insn, but we must not allow the code we just generated to be reordered
567 by scheduling. Specifically, the update of the frame pointer must
568 happen immediately, not later. So emit an ASM_INPUT to act as blockage
570 emit_insn (gen_rtx_ASM_INPUT (VOIDmode
, ""));
573 /* __builtin_setjmp is passed a pointer to an array of five words (not
574 all will be used on all machines). It operates similarly to the C
575 library function of the same name, but is more efficient. Much of
576 the code below (and for longjmp) is copied from the handling of
579 NOTE: This is intended for use by GNAT and the exception handling
580 scheme in the compiler and will only work in the method used by
584 expand_builtin_setjmp (arglist
, target
)
588 rtx buf_addr
, next_lab
, cont_lab
;
590 if (!validate_arglist (arglist
, POINTER_TYPE
, VOID_TYPE
))
593 if (target
== 0 || GET_CODE (target
) != REG
594 || REGNO (target
) < FIRST_PSEUDO_REGISTER
)
595 target
= gen_reg_rtx (TYPE_MODE (integer_type_node
));
597 buf_addr
= expand_expr (TREE_VALUE (arglist
), NULL_RTX
, VOIDmode
, 0);
599 next_lab
= gen_label_rtx ();
600 cont_lab
= gen_label_rtx ();
602 expand_builtin_setjmp_setup (buf_addr
, next_lab
);
604 /* Set TARGET to zero and branch to the continue label. */
605 emit_move_insn (target
, const0_rtx
);
606 emit_jump_insn (gen_jump (cont_lab
));
608 emit_label (next_lab
);
610 expand_builtin_setjmp_receiver (next_lab
);
612 /* Set TARGET to one. */
613 emit_move_insn (target
, const1_rtx
);
614 emit_label (cont_lab
);
616 /* Tell flow about the strange goings on. Putting `next_lab' on
617 `nonlocal_goto_handler_labels' to indicates that function
618 calls may traverse the arc back to this label. */
620 current_function_has_nonlocal_label
= 1;
621 nonlocal_goto_handler_labels
622 = gen_rtx_EXPR_LIST (VOIDmode
, next_lab
, nonlocal_goto_handler_labels
);
627 /* __builtin_longjmp is passed a pointer to an array of five words (not
628 all will be used on all machines). It operates similarly to the C
629 library function of the same name, but is more efficient. Much of
630 the code below is copied from the handling of non-local gotos.
632 NOTE: This is intended for use by GNAT and the exception handling
633 scheme in the compiler and will only work in the method used by
637 expand_builtin_longjmp (buf_addr
, value
)
640 rtx fp
, lab
, stack
, insn
;
641 enum machine_mode sa_mode
= STACK_SAVEAREA_MODE (SAVE_NONLOCAL
);
643 if (setjmp_alias_set
== -1)
644 setjmp_alias_set
= new_alias_set ();
646 #ifdef POINTERS_EXTEND_UNSIGNED
647 if (GET_MODE (buf_addr
) != Pmode
)
648 buf_addr
= convert_memory_address (Pmode
, buf_addr
);
651 buf_addr
= force_reg (Pmode
, buf_addr
);
653 /* We used to store value in static_chain_rtx, but that fails if pointers
654 are smaller than integers. We instead require that the user must pass
655 a second argument of 1, because that is what builtin_setjmp will
656 return. This also makes EH slightly more efficient, since we are no
657 longer copying around a value that we don't care about. */
658 if (value
!= const1_rtx
)
661 current_function_calls_longjmp
= 1;
663 #ifdef HAVE_builtin_longjmp
664 if (HAVE_builtin_longjmp
)
665 emit_insn (gen_builtin_longjmp (buf_addr
));
669 fp
= gen_rtx_MEM (Pmode
, buf_addr
);
670 lab
= gen_rtx_MEM (Pmode
, plus_constant (buf_addr
,
671 GET_MODE_SIZE (Pmode
)));
673 stack
= gen_rtx_MEM (sa_mode
, plus_constant (buf_addr
,
674 2 * GET_MODE_SIZE (Pmode
)));
675 set_mem_alias_set (fp
, setjmp_alias_set
);
676 set_mem_alias_set (lab
, setjmp_alias_set
);
677 set_mem_alias_set (stack
, setjmp_alias_set
);
679 /* Pick up FP, label, and SP from the block and jump. This code is
680 from expand_goto in stmt.c; see there for detailed comments. */
681 #if HAVE_nonlocal_goto
682 if (HAVE_nonlocal_goto
)
683 /* We have to pass a value to the nonlocal_goto pattern that will
684 get copied into the static_chain pointer, but it does not matter
685 what that value is, because builtin_setjmp does not use it. */
686 emit_insn (gen_nonlocal_goto (value
, lab
, stack
, fp
));
690 lab
= copy_to_reg (lab
);
692 emit_move_insn (hard_frame_pointer_rtx
, fp
);
693 emit_stack_restore (SAVE_NONLOCAL
, stack
, NULL_RTX
);
695 emit_insn (gen_rtx_USE (VOIDmode
, hard_frame_pointer_rtx
));
696 emit_insn (gen_rtx_USE (VOIDmode
, stack_pointer_rtx
));
697 emit_indirect_jump (lab
);
701 /* Search backwards and mark the jump insn as a non-local goto.
702 Note that this precludes the use of __builtin_longjmp to a
703 __builtin_setjmp target in the same function. However, we've
704 already cautioned the user that these functions are for
705 internal exception handling use only. */
706 for (insn
= get_last_insn (); insn
; insn
= PREV_INSN (insn
))
708 if (GET_CODE (insn
) == JUMP_INSN
)
710 REG_NOTES (insn
) = alloc_EXPR_LIST (REG_NON_LOCAL_GOTO
, const0_rtx
,
714 else if (GET_CODE (insn
) == CALL_INSN
)
719 /* Expand a call to __builtin_prefetch. For a target that does not support
720 data prefetch, evaluate the memory address argument in case it has side
724 expand_builtin_prefetch (arglist
)
727 tree arg0
, arg1
, arg2
;
730 if (!validate_arglist (arglist
, POINTER_TYPE
, 0))
733 arg0
= TREE_VALUE (arglist
);
734 /* Arguments 1 and 2 are optional; argument 1 (read/write) defaults to
735 zero (read) and argument 2 (locality) defaults to 3 (high degree of
737 if (TREE_CHAIN (arglist
))
739 arg1
= TREE_VALUE (TREE_CHAIN (arglist
));
740 if (TREE_CHAIN (TREE_CHAIN (arglist
)))
741 arg2
= TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist
)));
743 arg2
= build_int_2 (3, 0);
747 arg1
= integer_zero_node
;
748 arg2
= build_int_2 (3, 0);
751 /* Argument 0 is an address. */
752 op0
= expand_expr (arg0
, NULL_RTX
, Pmode
, EXPAND_NORMAL
);
754 /* Argument 1 (read/write flag) must be a compile-time constant int. */
755 if (TREE_CODE (arg1
) != INTEGER_CST
)
757 error ("second arg to `__builtin_prefetch' must be a constant");
758 arg1
= integer_zero_node
;
760 op1
= expand_expr (arg1
, NULL_RTX
, VOIDmode
, 0);
761 /* Argument 1 must be either zero or one. */
762 if (INTVAL (op1
) != 0 && INTVAL (op1
) != 1)
764 warning ("invalid second arg to __builtin_prefetch; using zero");
768 /* Argument 2 (locality) must be a compile-time constant int. */
769 if (TREE_CODE (arg2
) != INTEGER_CST
)
771 error ("third arg to `__builtin_prefetch' must be a constant");
772 arg2
= integer_zero_node
;
774 op2
= expand_expr (arg2
, NULL_RTX
, VOIDmode
, 0);
775 /* Argument 2 must be 0, 1, 2, or 3. */
776 if (INTVAL (op2
) < 0 || INTVAL (op2
) > 3)
778 warning ("invalid third arg to __builtin_prefetch; using zero");
785 if (! (*insn_data
[(int)CODE_FOR_prefetch
].operand
[0].predicate
)
787 op0
= force_reg (Pmode
, op0
);
788 emit_insn (gen_prefetch (op0
, op1
, op2
));
792 op0
= protect_from_queue (op0
, 0);
793 /* Don't do anything with direct references to volatile memory, but
794 generate code to handle other side effects. */
795 if (GET_CODE (op0
) != MEM
&& side_effects_p (op0
))
799 /* Get a MEM rtx for expression EXP which is the address of an operand
800 to be used to be used in a string instruction (cmpstrsi, movstrsi, ..). */
806 rtx addr
= expand_expr (exp
, NULL_RTX
, ptr_mode
, EXPAND_SUM
);
809 #ifdef POINTERS_EXTEND_UNSIGNED
810 if (GET_MODE (addr
) != Pmode
)
811 addr
= convert_memory_address (Pmode
, addr
);
814 mem
= gen_rtx_MEM (BLKmode
, memory_address (BLKmode
, addr
));
816 /* Get an expression we can use to find the attributes to assign to MEM.
817 If it is an ADDR_EXPR, use the operand. Otherwise, dereference it if
818 we can. First remove any nops. */
819 while ((TREE_CODE (exp
) == NOP_EXPR
|| TREE_CODE (exp
) == CONVERT_EXPR
820 || TREE_CODE (exp
) == NON_LVALUE_EXPR
)
821 && POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (exp
, 0))))
822 exp
= TREE_OPERAND (exp
, 0);
824 if (TREE_CODE (exp
) == ADDR_EXPR
)
826 exp
= TREE_OPERAND (exp
, 0);
827 set_mem_attributes (mem
, exp
, 0);
829 else if (POINTER_TYPE_P (TREE_TYPE (exp
)))
831 exp
= build1 (INDIRECT_REF
, TREE_TYPE (TREE_TYPE (exp
)), exp
);
832 /* memcpy, memset and other builtin stringops can alias with anything. */
833 set_mem_alias_set (mem
, 0);
839 /* Built-in functions to perform an untyped call and return. */
841 /* For each register that may be used for calling a function, this
842 gives a mode used to copy the register's value. VOIDmode indicates
843 the register is not used for calling a function. If the machine
844 has register windows, this gives only the outbound registers.
845 INCOMING_REGNO gives the corresponding inbound register. */
846 static enum machine_mode apply_args_mode
[FIRST_PSEUDO_REGISTER
];
848 /* For each register that may be used for returning values, this gives
849 a mode used to copy the register's value. VOIDmode indicates the
850 register is not used for returning values. If the machine has
851 register windows, this gives only the outbound registers.
852 INCOMING_REGNO gives the corresponding inbound register. */
853 static enum machine_mode apply_result_mode
[FIRST_PSEUDO_REGISTER
];
855 /* For each register that may be used for calling a function, this
856 gives the offset of that register into the block returned by
857 __builtin_apply_args. 0 indicates that the register is not
858 used for calling a function. */
859 static int apply_args_reg_offset
[FIRST_PSEUDO_REGISTER
];
861 /* Return the offset of register REGNO into the block returned by
862 __builtin_apply_args. This is not declared static, since it is
863 needed in objc-act.c. */
866 apply_args_register_offset (regno
)
871 /* Arguments are always put in outgoing registers (in the argument
872 block) if such make sense. */
873 #ifdef OUTGOING_REGNO
874 regno
= OUTGOING_REGNO(regno
);
876 return apply_args_reg_offset
[regno
];
879 /* Return the size required for the block returned by __builtin_apply_args,
880 and initialize apply_args_mode. */
885 static int size
= -1;
887 enum machine_mode mode
;
889 /* The values computed by this function never change. */
892 /* The first value is the incoming arg-pointer. */
893 size
= GET_MODE_SIZE (Pmode
);
895 /* The second value is the structure value address unless this is
896 passed as an "invisible" first argument. */
897 if (struct_value_rtx
)
898 size
+= GET_MODE_SIZE (Pmode
);
900 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
901 if (FUNCTION_ARG_REGNO_P (regno
))
903 /* Search for the proper mode for copying this register's
904 value. I'm not sure this is right, but it works so far. */
905 enum machine_mode best_mode
= VOIDmode
;
907 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_INT
);
909 mode
= GET_MODE_WIDER_MODE (mode
))
910 if (HARD_REGNO_MODE_OK (regno
, mode
)
911 && HARD_REGNO_NREGS (regno
, mode
) == 1)
914 if (best_mode
== VOIDmode
)
915 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_FLOAT
);
917 mode
= GET_MODE_WIDER_MODE (mode
))
918 if (HARD_REGNO_MODE_OK (regno
, mode
)
919 && have_insn_for (SET
, mode
))
922 if (best_mode
== VOIDmode
)
923 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_VECTOR_FLOAT
);
925 mode
= GET_MODE_WIDER_MODE (mode
))
926 if (HARD_REGNO_MODE_OK (regno
, mode
)
927 && have_insn_for (SET
, mode
))
930 if (best_mode
== VOIDmode
)
931 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_VECTOR_INT
);
933 mode
= GET_MODE_WIDER_MODE (mode
))
934 if (HARD_REGNO_MODE_OK (regno
, mode
)
935 && have_insn_for (SET
, mode
))
939 if (mode
== VOIDmode
)
942 align
= GET_MODE_ALIGNMENT (mode
) / BITS_PER_UNIT
;
943 if (size
% align
!= 0)
944 size
= CEIL (size
, align
) * align
;
945 apply_args_reg_offset
[regno
] = size
;
946 size
+= GET_MODE_SIZE (mode
);
947 apply_args_mode
[regno
] = mode
;
951 apply_args_mode
[regno
] = VOIDmode
;
952 apply_args_reg_offset
[regno
] = 0;
958 /* Return the size required for the block returned by __builtin_apply,
959 and initialize apply_result_mode. */
964 static int size
= -1;
966 enum machine_mode mode
;
968 /* The values computed by this function never change. */
973 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
974 if (FUNCTION_VALUE_REGNO_P (regno
))
976 /* Search for the proper mode for copying this register's
977 value. I'm not sure this is right, but it works so far. */
978 enum machine_mode best_mode
= VOIDmode
;
980 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_INT
);
982 mode
= GET_MODE_WIDER_MODE (mode
))
983 if (HARD_REGNO_MODE_OK (regno
, mode
))
986 if (best_mode
== VOIDmode
)
987 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_FLOAT
);
989 mode
= GET_MODE_WIDER_MODE (mode
))
990 if (HARD_REGNO_MODE_OK (regno
, mode
)
991 && have_insn_for (SET
, mode
))
994 if (best_mode
== VOIDmode
)
995 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_VECTOR_FLOAT
);
997 mode
= GET_MODE_WIDER_MODE (mode
))
998 if (HARD_REGNO_MODE_OK (regno
, mode
)
999 && have_insn_for (SET
, mode
))
1002 if (best_mode
== VOIDmode
)
1003 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_VECTOR_INT
);
1005 mode
= GET_MODE_WIDER_MODE (mode
))
1006 if (HARD_REGNO_MODE_OK (regno
, mode
)
1007 && have_insn_for (SET
, mode
))
1011 if (mode
== VOIDmode
)
1014 align
= GET_MODE_ALIGNMENT (mode
) / BITS_PER_UNIT
;
1015 if (size
% align
!= 0)
1016 size
= CEIL (size
, align
) * align
;
1017 size
+= GET_MODE_SIZE (mode
);
1018 apply_result_mode
[regno
] = mode
;
1021 apply_result_mode
[regno
] = VOIDmode
;
1023 /* Allow targets that use untyped_call and untyped_return to override
1024 the size so that machine-specific information can be stored here. */
1025 #ifdef APPLY_RESULT_SIZE
1026 size
= APPLY_RESULT_SIZE
;
1032 #if defined (HAVE_untyped_call) || defined (HAVE_untyped_return)
1033 /* Create a vector describing the result block RESULT. If SAVEP is true,
1034 the result block is used to save the values; otherwise it is used to
1035 restore the values. */
1038 result_vector (savep
, result
)
1042 int regno
, size
, align
, nelts
;
1043 enum machine_mode mode
;
1045 rtx
*savevec
= (rtx
*) alloca (FIRST_PSEUDO_REGISTER
* sizeof (rtx
));
1048 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
1049 if ((mode
= apply_result_mode
[regno
]) != VOIDmode
)
1051 align
= GET_MODE_ALIGNMENT (mode
) / BITS_PER_UNIT
;
1052 if (size
% align
!= 0)
1053 size
= CEIL (size
, align
) * align
;
1054 reg
= gen_rtx_REG (mode
, savep
? regno
: INCOMING_REGNO (regno
));
1055 mem
= adjust_address (result
, mode
, size
);
1056 savevec
[nelts
++] = (savep
1057 ? gen_rtx_SET (VOIDmode
, mem
, reg
)
1058 : gen_rtx_SET (VOIDmode
, reg
, mem
));
1059 size
+= GET_MODE_SIZE (mode
);
1061 return gen_rtx_PARALLEL (VOIDmode
, gen_rtvec_v (nelts
, savevec
));
1063 #endif /* HAVE_untyped_call or HAVE_untyped_return */
1065 /* Save the state required to perform an untyped call with the same
1066 arguments as were passed to the current function. */
1069 expand_builtin_apply_args_1 ()
1072 int size
, align
, regno
;
1073 enum machine_mode mode
;
1075 /* Create a block where the arg-pointer, structure value address,
1076 and argument registers can be saved. */
1077 registers
= assign_stack_local (BLKmode
, apply_args_size (), -1);
1079 /* Walk past the arg-pointer and structure value address. */
1080 size
= GET_MODE_SIZE (Pmode
);
1081 if (struct_value_rtx
)
1082 size
+= GET_MODE_SIZE (Pmode
);
1084 /* Save each register used in calling a function to the block. */
1085 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
1086 if ((mode
= apply_args_mode
[regno
]) != VOIDmode
)
1090 align
= GET_MODE_ALIGNMENT (mode
) / BITS_PER_UNIT
;
1091 if (size
% align
!= 0)
1092 size
= CEIL (size
, align
) * align
;
1094 tem
= gen_rtx_REG (mode
, INCOMING_REGNO (regno
));
1096 emit_move_insn (adjust_address (registers
, mode
, size
), tem
);
1097 size
+= GET_MODE_SIZE (mode
);
1100 /* Save the arg pointer to the block. */
1101 emit_move_insn (adjust_address (registers
, Pmode
, 0),
1102 copy_to_reg (virtual_incoming_args_rtx
));
1103 size
= GET_MODE_SIZE (Pmode
);
1105 /* Save the structure value address unless this is passed as an
1106 "invisible" first argument. */
1107 if (struct_value_incoming_rtx
)
1109 emit_move_insn (adjust_address (registers
, Pmode
, size
),
1110 copy_to_reg (struct_value_incoming_rtx
));
1111 size
+= GET_MODE_SIZE (Pmode
);
1114 /* Return the address of the block. */
1115 return copy_addr_to_reg (XEXP (registers
, 0));
1118 /* __builtin_apply_args returns block of memory allocated on
1119 the stack into which is stored the arg pointer, structure
1120 value address, static chain, and all the registers that might
1121 possibly be used in performing a function call. The code is
1122 moved to the start of the function so the incoming values are
1126 expand_builtin_apply_args ()
1128 /* Don't do __builtin_apply_args more than once in a function.
1129 Save the result of the first call and reuse it. */
1130 if (apply_args_value
!= 0)
1131 return apply_args_value
;
1133 /* When this function is called, it means that registers must be
1134 saved on entry to this function. So we migrate the
1135 call to the first insn of this function. */
1140 temp
= expand_builtin_apply_args_1 ();
1144 apply_args_value
= temp
;
1146 /* Put the sequence after the NOTE that starts the function.
1147 If this is inside a SEQUENCE, make the outer-level insn
1148 chain current, so the code is placed at the start of the
1150 push_topmost_sequence ();
1151 emit_insns_before (seq
, NEXT_INSN (get_insns ()));
1152 pop_topmost_sequence ();
1157 /* Perform an untyped call and save the state required to perform an
1158 untyped return of whatever value was returned by the given function. */
1161 expand_builtin_apply (function
, arguments
, argsize
)
1162 rtx function
, arguments
, argsize
;
1164 int size
, align
, regno
;
1165 enum machine_mode mode
;
1166 rtx incoming_args
, result
, reg
, dest
, src
, call_insn
;
1167 rtx old_stack_level
= 0;
1168 rtx call_fusage
= 0;
1170 #ifdef POINTERS_EXTEND_UNSIGNED
1171 if (GET_MODE (arguments
) != Pmode
)
1172 arguments
= convert_memory_address (Pmode
, arguments
);
1175 /* Create a block where the return registers can be saved. */
1176 result
= assign_stack_local (BLKmode
, apply_result_size (), -1);
1178 /* Fetch the arg pointer from the ARGUMENTS block. */
1179 incoming_args
= gen_reg_rtx (Pmode
);
1180 emit_move_insn (incoming_args
, gen_rtx_MEM (Pmode
, arguments
));
1181 #ifndef STACK_GROWS_DOWNWARD
1182 incoming_args
= expand_simple_binop (Pmode
, MINUS
, incoming_args
, argsize
,
1183 incoming_args
, 0, OPTAB_LIB_WIDEN
);
1186 /* Perform postincrements before actually calling the function. */
1189 /* Push a new argument block and copy the arguments. Do not allow
1190 the (potential) memcpy call below to interfere with our stack
1192 do_pending_stack_adjust ();
1195 /* Save the stack with nonlocal if available */
1196 #ifdef HAVE_save_stack_nonlocal
1197 if (HAVE_save_stack_nonlocal
)
1198 emit_stack_save (SAVE_NONLOCAL
, &old_stack_level
, NULL_RTX
);
1201 emit_stack_save (SAVE_BLOCK
, &old_stack_level
, NULL_RTX
);
1203 /* Push a block of memory onto the stack to store the memory arguments.
1204 Save the address in a register, and copy the memory arguments. ??? I
1205 haven't figured out how the calling convention macros effect this,
1206 but it's likely that the source and/or destination addresses in
1207 the block copy will need updating in machine specific ways. */
1208 dest
= allocate_dynamic_stack_space (argsize
, 0, BITS_PER_UNIT
);
1209 dest
= gen_rtx_MEM (BLKmode
, dest
);
1210 set_mem_align (dest
, PARM_BOUNDARY
);
1211 src
= gen_rtx_MEM (BLKmode
, incoming_args
);
1212 set_mem_align (src
, PARM_BOUNDARY
);
1213 emit_block_move (dest
, src
, argsize
);
1215 /* Refer to the argument block. */
1217 arguments
= gen_rtx_MEM (BLKmode
, arguments
);
1218 set_mem_align (arguments
, PARM_BOUNDARY
);
1220 /* Walk past the arg-pointer and structure value address. */
1221 size
= GET_MODE_SIZE (Pmode
);
1222 if (struct_value_rtx
)
1223 size
+= GET_MODE_SIZE (Pmode
);
1225 /* Restore each of the registers previously saved. Make USE insns
1226 for each of these registers for use in making the call. */
1227 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
1228 if ((mode
= apply_args_mode
[regno
]) != VOIDmode
)
1230 align
= GET_MODE_ALIGNMENT (mode
) / BITS_PER_UNIT
;
1231 if (size
% align
!= 0)
1232 size
= CEIL (size
, align
) * align
;
1233 reg
= gen_rtx_REG (mode
, regno
);
1234 emit_move_insn (reg
, adjust_address (arguments
, mode
, size
));
1235 use_reg (&call_fusage
, reg
);
1236 size
+= GET_MODE_SIZE (mode
);
1239 /* Restore the structure value address unless this is passed as an
1240 "invisible" first argument. */
1241 size
= GET_MODE_SIZE (Pmode
);
1242 if (struct_value_rtx
)
1244 rtx value
= gen_reg_rtx (Pmode
);
1245 emit_move_insn (value
, adjust_address (arguments
, Pmode
, size
));
1246 emit_move_insn (struct_value_rtx
, value
);
1247 if (GET_CODE (struct_value_rtx
) == REG
)
1248 use_reg (&call_fusage
, struct_value_rtx
);
1249 size
+= GET_MODE_SIZE (Pmode
);
1252 /* All arguments and registers used for the call are set up by now! */
1253 function
= prepare_call_address (function
, NULL_TREE
, &call_fusage
, 0, 0);
1255 /* Ensure address is valid. SYMBOL_REF is already valid, so no need,
1256 and we don't want to load it into a register as an optimization,
1257 because prepare_call_address already did it if it should be done. */
1258 if (GET_CODE (function
) != SYMBOL_REF
)
1259 function
= memory_address (FUNCTION_MODE
, function
);
1261 /* Generate the actual call instruction and save the return value. */
1262 #ifdef HAVE_untyped_call
1263 if (HAVE_untyped_call
)
1264 emit_call_insn (gen_untyped_call (gen_rtx_MEM (FUNCTION_MODE
, function
),
1265 result
, result_vector (1, result
)));
1268 #ifdef HAVE_call_value
1269 if (HAVE_call_value
)
1273 /* Locate the unique return register. It is not possible to
1274 express a call that sets more than one return register using
1275 call_value; use untyped_call for that. In fact, untyped_call
1276 only needs to save the return registers in the given block. */
1277 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
1278 if ((mode
= apply_result_mode
[regno
]) != VOIDmode
)
1281 abort (); /* HAVE_untyped_call required. */
1282 valreg
= gen_rtx_REG (mode
, regno
);
1285 emit_call_insn (GEN_CALL_VALUE (valreg
,
1286 gen_rtx_MEM (FUNCTION_MODE
, function
),
1287 const0_rtx
, NULL_RTX
, const0_rtx
));
1289 emit_move_insn (adjust_address (result
, GET_MODE (valreg
), 0), valreg
);
1295 /* Find the CALL insn we just emitted. */
1296 for (call_insn
= get_last_insn ();
1297 call_insn
&& GET_CODE (call_insn
) != CALL_INSN
;
1298 call_insn
= PREV_INSN (call_insn
))
1304 /* Put the register usage information on the CALL. If there is already
1305 some usage information, put ours at the end. */
1306 if (CALL_INSN_FUNCTION_USAGE (call_insn
))
1310 for (link
= CALL_INSN_FUNCTION_USAGE (call_insn
); XEXP (link
, 1) != 0;
1311 link
= XEXP (link
, 1))
1314 XEXP (link
, 1) = call_fusage
;
1317 CALL_INSN_FUNCTION_USAGE (call_insn
) = call_fusage
;
1319 /* Restore the stack. */
1320 #ifdef HAVE_save_stack_nonlocal
1321 if (HAVE_save_stack_nonlocal
)
1322 emit_stack_restore (SAVE_NONLOCAL
, old_stack_level
, NULL_RTX
);
1325 emit_stack_restore (SAVE_BLOCK
, old_stack_level
, NULL_RTX
);
1329 /* Return the address of the result block. */
1330 return copy_addr_to_reg (XEXP (result
, 0));
1333 /* Perform an untyped return. */
1336 expand_builtin_return (result
)
1339 int size
, align
, regno
;
1340 enum machine_mode mode
;
1342 rtx call_fusage
= 0;
1344 #ifdef POINTERS_EXTEND_UNSIGNED
1345 if (GET_MODE (result
) != Pmode
)
1346 result
= convert_memory_address (Pmode
, result
);
1349 apply_result_size ();
1350 result
= gen_rtx_MEM (BLKmode
, result
);
1352 #ifdef HAVE_untyped_return
1353 if (HAVE_untyped_return
)
1355 emit_jump_insn (gen_untyped_return (result
, result_vector (0, result
)));
1361 /* Restore the return value and note that each value is used. */
1363 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
1364 if ((mode
= apply_result_mode
[regno
]) != VOIDmode
)
1366 align
= GET_MODE_ALIGNMENT (mode
) / BITS_PER_UNIT
;
1367 if (size
% align
!= 0)
1368 size
= CEIL (size
, align
) * align
;
1369 reg
= gen_rtx_REG (mode
, INCOMING_REGNO (regno
));
1370 emit_move_insn (reg
, adjust_address (result
, mode
, size
));
1372 push_to_sequence (call_fusage
);
1373 emit_insn (gen_rtx_USE (VOIDmode
, reg
));
1374 call_fusage
= get_insns ();
1376 size
+= GET_MODE_SIZE (mode
);
1379 /* Put the USE insns before the return. */
1380 emit_insns (call_fusage
);
1382 /* Return whatever values was restored by jumping directly to the end
1384 expand_null_return ();
1387 /* Used by expand_builtin_classify_type and fold_builtin_classify_type. */
1389 static enum type_class
1390 type_to_class (type
)
1393 switch (TREE_CODE (type
))
1395 case VOID_TYPE
: return void_type_class
;
1396 case INTEGER_TYPE
: return integer_type_class
;
1397 case CHAR_TYPE
: return char_type_class
;
1398 case ENUMERAL_TYPE
: return enumeral_type_class
;
1399 case BOOLEAN_TYPE
: return boolean_type_class
;
1400 case POINTER_TYPE
: return pointer_type_class
;
1401 case REFERENCE_TYPE
: return reference_type_class
;
1402 case OFFSET_TYPE
: return offset_type_class
;
1403 case REAL_TYPE
: return real_type_class
;
1404 case COMPLEX_TYPE
: return complex_type_class
;
1405 case FUNCTION_TYPE
: return function_type_class
;
1406 case METHOD_TYPE
: return method_type_class
;
1407 case RECORD_TYPE
: return record_type_class
;
1409 case QUAL_UNION_TYPE
: return union_type_class
;
1410 case ARRAY_TYPE
: return (TYPE_STRING_FLAG (type
)
1411 ? string_type_class
: array_type_class
);
1412 case SET_TYPE
: return set_type_class
;
1413 case FILE_TYPE
: return file_type_class
;
1414 case LANG_TYPE
: return lang_type_class
;
1415 default: return no_type_class
;
1419 /* Expand a call to __builtin_classify_type with arguments found in
1423 expand_builtin_classify_type (arglist
)
1427 return GEN_INT (type_to_class (TREE_TYPE (TREE_VALUE (arglist
))));
1428 return GEN_INT (no_type_class
);
1431 /* Expand expression EXP, which is a call to __builtin_constant_p. */
1434 expand_builtin_constant_p (exp
)
1437 tree arglist
= TREE_OPERAND (exp
, 1);
1438 enum machine_mode value_mode
= TYPE_MODE (TREE_TYPE (exp
));
1443 arglist
= TREE_VALUE (arglist
);
1445 /* We have taken care of the easy cases during constant folding. This
1446 case is not obvious, so emit (constant_p_rtx (ARGLIST)) and let CSE get a
1447 chance to see if it can deduce whether ARGLIST is constant. */
1449 tmp
= expand_expr (arglist
, NULL_RTX
, VOIDmode
, 0);
1450 tmp
= gen_rtx_CONSTANT_P_RTX (value_mode
, tmp
);
1454 /* Expand a call to one of the builtin math functions (sin, cos, or sqrt).
1455 Return 0 if a normal call should be emitted rather than expanding the
1456 function in-line. EXP is the expression that is a call to the builtin
1457 function; if convenient, the result should be placed in TARGET.
1458 SUBTARGET may be used as the target for computing one of EXP's operands. */
1461 expand_builtin_mathfn (exp
, target
, subtarget
)
1463 rtx target
, subtarget
;
1465 optab builtin_optab
;
1467 tree fndecl
= TREE_OPERAND (TREE_OPERAND (exp
, 0), 0);
1468 tree arglist
= TREE_OPERAND (exp
, 1);
1470 if (!validate_arglist (arglist
, REAL_TYPE
, VOID_TYPE
))
1473 /* Stabilize and compute the argument. */
1474 if (TREE_CODE (TREE_VALUE (arglist
)) != VAR_DECL
1475 && TREE_CODE (TREE_VALUE (arglist
)) != PARM_DECL
)
1477 exp
= copy_node (exp
);
1478 TREE_OPERAND (exp
, 1) = arglist
;
1479 /* Wrap the computation of the argument in a SAVE_EXPR. That
1480 way, if we need to expand the argument again (as in the
1481 flag_errno_math case below where we cannot directly set
1482 errno), we will not perform side-effects more than once.
1483 Note that here we're mutating the original EXP as well as the
1484 copy; that's the right thing to do in case the original EXP
1485 is expanded later. */
1486 TREE_VALUE (arglist
) = save_expr (TREE_VALUE (arglist
));
1487 arglist
= copy_node (arglist
);
1489 op0
= expand_expr (TREE_VALUE (arglist
), subtarget
, VOIDmode
, 0);
1491 /* Make a suitable register to place result in. */
1492 target
= gen_reg_rtx (TYPE_MODE (TREE_TYPE (exp
)));
1497 switch (DECL_FUNCTION_CODE (fndecl
))
1502 builtin_optab
= sin_optab
; break;
1506 builtin_optab
= cos_optab
; break;
1507 case BUILT_IN_FSQRT
:
1508 case BUILT_IN_SQRTF
:
1509 case BUILT_IN_SQRTL
:
1510 builtin_optab
= sqrt_optab
; break;
1515 /* Compute into TARGET.
1516 Set TARGET to wherever the result comes back. */
1517 target
= expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist
))),
1518 builtin_optab
, op0
, target
, 0);
1520 /* If we were unable to expand via the builtin, stop the
1521 sequence (without outputting the insns) and return 0, causing
1522 a call to the library function. */
1529 /* If errno must be maintained and if we are not allowing unsafe
1530 math optimizations, check the result. */
1532 if (flag_errno_math
&& ! flag_unsafe_math_optimizations
)
1536 /* Don't define the builtin FP instructions
1537 if your machine is not IEEE. */
1538 if (TARGET_FLOAT_FORMAT
!= IEEE_FLOAT_FORMAT
)
1541 lab1
= gen_label_rtx ();
1543 /* Test the result; if it is NaN, set errno=EDOM because
1544 the argument was not in the domain. */
1545 emit_cmp_and_jump_insns (target
, target
, EQ
, 0, GET_MODE (target
),
1550 #ifdef GEN_ERRNO_RTX
1551 rtx errno_rtx
= GEN_ERRNO_RTX
;
1554 = gen_rtx_MEM (word_mode
, gen_rtx_SYMBOL_REF (Pmode
, "errno"));
1557 emit_move_insn (errno_rtx
, GEN_INT (TARGET_EDOM
));
1560 /* We can't set errno=EDOM directly; let the library call do it.
1561 Pop the arguments right away in case the call gets deleted. */
1563 expand_call (exp
, target
, 0);
1570 /* Output the entire sequence. */
1571 insns
= get_insns ();
1578 /* Expand expression EXP which is a call to the strlen builtin. Return 0
1579 if we failed the caller should emit a normal call, otherwise
1580 try to get the result in TARGET, if convenient. */
1583 expand_builtin_strlen (exp
, target
)
1587 tree arglist
= TREE_OPERAND (exp
, 1);
1588 enum machine_mode value_mode
= TYPE_MODE (TREE_TYPE (exp
));
1590 if (!validate_arglist (arglist
, POINTER_TYPE
, VOID_TYPE
))
1595 tree src
= TREE_VALUE (arglist
);
1598 = get_pointer_alignment (src
, BIGGEST_ALIGNMENT
) / BITS_PER_UNIT
;
1600 rtx result
, src_reg
, char_rtx
, before_strlen
;
1601 enum machine_mode insn_mode
= value_mode
, char_mode
;
1602 enum insn_code icode
= CODE_FOR_nothing
;
1604 /* If SRC is not a pointer type, don't do this operation inline. */
1608 /* Bail out if we can't compute strlen in the right mode. */
1609 while (insn_mode
!= VOIDmode
)
1611 icode
= strlen_optab
->handlers
[(int) insn_mode
].insn_code
;
1612 if (icode
!= CODE_FOR_nothing
)
1615 insn_mode
= GET_MODE_WIDER_MODE (insn_mode
);
1617 if (insn_mode
== VOIDmode
)
1620 /* Make a place to write the result of the instruction. */
1623 && GET_CODE (result
) == REG
1624 && GET_MODE (result
) == insn_mode
1625 && REGNO (result
) >= FIRST_PSEUDO_REGISTER
))
1626 result
= gen_reg_rtx (insn_mode
);
1628 /* Make a place to hold the source address. We will not expand
1629 the actual source until we are sure that the expansion will
1630 not fail -- there are trees that cannot be expanded twice. */
1631 src_reg
= gen_reg_rtx (Pmode
);
1633 /* Mark the beginning of the strlen sequence so we can emit the
1634 source operand later. */
1635 before_strlen
= get_last_insn();
1637 char_rtx
= const0_rtx
;
1638 char_mode
= insn_data
[(int) icode
].operand
[2].mode
;
1639 if (! (*insn_data
[(int) icode
].operand
[2].predicate
) (char_rtx
,
1641 char_rtx
= copy_to_mode_reg (char_mode
, char_rtx
);
1643 pat
= GEN_FCN (icode
) (result
, gen_rtx_MEM (BLKmode
, src_reg
),
1644 char_rtx
, GEN_INT (align
));
1649 /* Now that we are assured of success, expand the source. */
1651 pat
= memory_address (BLKmode
,
1652 expand_expr (src
, src_reg
, ptr_mode
, EXPAND_SUM
));
1654 emit_move_insn (src_reg
, pat
);
1655 pat
= gen_sequence ();
1659 emit_insn_after (pat
, before_strlen
);
1661 emit_insn_before (pat
, get_insns ());
1663 /* Return the value in the proper mode for this function. */
1664 if (GET_MODE (result
) == value_mode
)
1666 else if (target
!= 0)
1667 convert_move (target
, result
, 0);
1669 target
= convert_to_mode (value_mode
, result
, 0);
1675 /* Expand a call to the strstr builtin. Return 0 if we failed the
1676 caller should emit a normal call, otherwise try to get the result
1677 in TARGET, if convenient (and in mode MODE if that's convenient). */
1680 expand_builtin_strstr (arglist
, target
, mode
)
1683 enum machine_mode mode
;
1685 if (!validate_arglist (arglist
, POINTER_TYPE
, POINTER_TYPE
, VOID_TYPE
))
1689 tree s1
= TREE_VALUE (arglist
), s2
= TREE_VALUE (TREE_CHAIN (arglist
));
1691 const char *p1
, *p2
;
1700 const char *r
= strstr (p1
, p2
);
1705 /* Return an offset into the constant string argument. */
1706 return expand_expr (fold (build (PLUS_EXPR
, TREE_TYPE (s1
),
1707 s1
, ssize_int (r
- p1
))),
1708 target
, mode
, EXPAND_NORMAL
);
1712 return expand_expr (s1
, target
, mode
, EXPAND_NORMAL
);
1717 fn
= built_in_decls
[BUILT_IN_STRCHR
];
1721 /* New argument list transforming strstr(s1, s2) to
1722 strchr(s1, s2[0]). */
1724 build_tree_list (NULL_TREE
, build_int_2 (p2
[0], 0));
1725 arglist
= tree_cons (NULL_TREE
, s1
, arglist
);
1726 return expand_expr (build_function_call_expr (fn
, arglist
),
1727 target
, mode
, EXPAND_NORMAL
);
1731 /* Expand a call to the strchr builtin. Return 0 if we failed the
1732 caller should emit a normal call, otherwise try to get the result
1733 in TARGET, if convenient (and in mode MODE if that's convenient). */
1736 expand_builtin_strchr (arglist
, target
, mode
)
1739 enum machine_mode mode
;
1741 if (!validate_arglist (arglist
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
1745 tree s1
= TREE_VALUE (arglist
), s2
= TREE_VALUE (TREE_CHAIN (arglist
));
1748 if (TREE_CODE (s2
) != INTEGER_CST
)
1757 if (target_char_cast (s2
, &c
))
1765 /* Return an offset into the constant string argument. */
1766 return expand_expr (fold (build (PLUS_EXPR
, TREE_TYPE (s1
),
1767 s1
, ssize_int (r
- p1
))),
1768 target
, mode
, EXPAND_NORMAL
);
1771 /* FIXME: Should use here strchrM optab so that ports can optimize
1777 /* Expand a call to the strrchr builtin. Return 0 if we failed the
1778 caller should emit a normal call, otherwise try to get the result
1779 in TARGET, if convenient (and in mode MODE if that's convenient). */
1782 expand_builtin_strrchr (arglist
, target
, mode
)
1785 enum machine_mode mode
;
1787 if (!validate_arglist (arglist
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
1791 tree s1
= TREE_VALUE (arglist
), s2
= TREE_VALUE (TREE_CHAIN (arglist
));
1795 if (TREE_CODE (s2
) != INTEGER_CST
)
1804 if (target_char_cast (s2
, &c
))
1807 r
= strrchr (p1
, c
);
1812 /* Return an offset into the constant string argument. */
1813 return expand_expr (fold (build (PLUS_EXPR
, TREE_TYPE (s1
),
1814 s1
, ssize_int (r
- p1
))),
1815 target
, mode
, EXPAND_NORMAL
);
1818 if (! integer_zerop (s2
))
1821 fn
= built_in_decls
[BUILT_IN_STRCHR
];
1825 /* Transform strrchr(s1, '\0') to strchr(s1, '\0'). */
1826 return expand_expr (build_function_call_expr (fn
, arglist
),
1827 target
, mode
, EXPAND_NORMAL
);
1831 /* Expand a call to the strpbrk builtin. Return 0 if we failed the
1832 caller should emit a normal call, otherwise try to get the result
1833 in TARGET, if convenient (and in mode MODE if that's convenient). */
1836 expand_builtin_strpbrk (arglist
, target
, mode
)
1839 enum machine_mode mode
;
1841 if (!validate_arglist (arglist
, POINTER_TYPE
, POINTER_TYPE
, VOID_TYPE
))
1845 tree s1
= TREE_VALUE (arglist
), s2
= TREE_VALUE (TREE_CHAIN (arglist
));
1847 const char *p1
, *p2
;
1856 const char *r
= strpbrk (p1
, p2
);
1861 /* Return an offset into the constant string argument. */
1862 return expand_expr (fold (build (PLUS_EXPR
, TREE_TYPE (s1
),
1863 s1
, ssize_int (r
- p1
))),
1864 target
, mode
, EXPAND_NORMAL
);
1869 /* strpbrk(x, "") == NULL.
1870 Evaluate and ignore the arguments in case they had
1872 expand_expr (s1
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
1877 return 0; /* Really call strpbrk. */
1879 fn
= built_in_decls
[BUILT_IN_STRCHR
];
1883 /* New argument list transforming strpbrk(s1, s2) to
1884 strchr(s1, s2[0]). */
1886 build_tree_list (NULL_TREE
, build_int_2 (p2
[0], 0));
1887 arglist
= tree_cons (NULL_TREE
, s1
, arglist
);
1888 return expand_expr (build_function_call_expr (fn
, arglist
),
1889 target
, mode
, EXPAND_NORMAL
);
1893 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
1894 bytes from constant string DATA + OFFSET and return it as target
1898 builtin_memcpy_read_str (data
, offset
, mode
)
1900 HOST_WIDE_INT offset
;
1901 enum machine_mode mode
;
1903 const char *str
= (const char *) data
;
1906 || ((unsigned HOST_WIDE_INT
) offset
+ GET_MODE_SIZE (mode
)
1907 > strlen (str
) + 1))
1908 abort (); /* Attempt to read past the end of constant string. */
1910 return c_readstr (str
+ offset
, mode
);
1913 /* Expand a call to the memcpy builtin, with arguments in ARGLIST. */
1916 expand_builtin_memcpy (arglist
)
1919 if (!validate_arglist (arglist
,
1920 POINTER_TYPE
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
1924 tree dest
= TREE_VALUE (arglist
);
1925 tree src
= TREE_VALUE (TREE_CHAIN (arglist
));
1926 tree len
= TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist
)));
1927 const char *src_str
;
1929 unsigned int src_align
= get_pointer_alignment (src
, BIGGEST_ALIGNMENT
);
1930 unsigned int dest_align
1931 = get_pointer_alignment (dest
, BIGGEST_ALIGNMENT
);
1932 rtx dest_mem
, src_mem
, dest_addr
, len_rtx
;
1934 /* If either SRC or DEST is not a pointer type, don't do
1935 this operation in-line. */
1936 if (src_align
== 0 || dest_align
== 0)
1939 dest_mem
= get_memory_rtx (dest
);
1940 set_mem_align (dest_mem
, dest_align
);
1941 len_rtx
= expand_expr (len
, NULL_RTX
, VOIDmode
, 0);
1942 src_str
= c_getstr (src
);
1944 /* If SRC is a string constant and block move would be done
1945 by pieces, we can avoid loading the string from memory
1946 and only stored the computed constants. */
1948 && GET_CODE (len_rtx
) == CONST_INT
1949 && (unsigned HOST_WIDE_INT
) INTVAL (len_rtx
) <= strlen (src_str
) + 1
1950 && can_store_by_pieces (INTVAL (len_rtx
), builtin_memcpy_read_str
,
1951 (PTR
) src_str
, dest_align
))
1953 store_by_pieces (dest_mem
, INTVAL (len_rtx
),
1954 builtin_memcpy_read_str
,
1955 (PTR
) src_str
, dest_align
);
1956 return force_operand (XEXP (dest_mem
, 0), NULL_RTX
);
1959 src_mem
= get_memory_rtx (src
);
1960 set_mem_align (src_mem
, src_align
);
1962 /* Copy word part most expediently. */
1963 dest_addr
= emit_block_move (dest_mem
, src_mem
, len_rtx
);
1966 dest_addr
= force_operand (XEXP (dest_mem
, 0), NULL_RTX
);
1972 /* Expand expression EXP, which is a call to the strcpy builtin. Return 0
1973 if we failed the caller should emit a normal call. */
1976 expand_builtin_strcpy (exp
)
1979 tree arglist
= TREE_OPERAND (exp
, 1);
1982 if (!validate_arglist (arglist
, POINTER_TYPE
, POINTER_TYPE
, VOID_TYPE
))
1986 tree len
= c_strlen (TREE_VALUE (TREE_CHAIN (arglist
)));
1991 len
= size_binop (PLUS_EXPR
, len
, ssize_int (1));
1992 chainon (arglist
, build_tree_list (NULL_TREE
, len
));
1995 result
= expand_builtin_memcpy (arglist
);
1998 TREE_CHAIN (TREE_CHAIN (arglist
)) = 0;
2002 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
2003 bytes from constant string DATA + OFFSET and return it as target
2007 builtin_strncpy_read_str (data
, offset
, mode
)
2009 HOST_WIDE_INT offset
;
2010 enum machine_mode mode
;
2012 const char *str
= (const char *) data
;
2014 if ((unsigned HOST_WIDE_INT
) offset
> strlen (str
))
2017 return c_readstr (str
+ offset
, mode
);
2020 /* Expand expression EXP, which is a call to the strncpy builtin. Return 0
2021 if we failed the caller should emit a normal call. */
2024 expand_builtin_strncpy (arglist
, target
, mode
)
2027 enum machine_mode mode
;
2029 if (!validate_arglist (arglist
,
2030 POINTER_TYPE
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
2034 tree slen
= c_strlen (TREE_VALUE (TREE_CHAIN (arglist
)));
2035 tree len
= TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist
)));
2037 /* We must be passed a constant len parameter. */
2038 if (TREE_CODE (len
) != INTEGER_CST
)
2041 /* If the len parameter is zero, return the dst parameter. */
2042 if (compare_tree_int (len
, 0) == 0)
2044 /* Evaluate and ignore the src argument in case it has
2046 expand_expr (TREE_VALUE (TREE_CHAIN (arglist
)), const0_rtx
,
2047 VOIDmode
, EXPAND_NORMAL
);
2048 /* Return the dst parameter. */
2049 return expand_expr (TREE_VALUE (arglist
), target
, mode
,
2053 /* Now, we must be passed a constant src ptr parameter. */
2054 if (slen
== 0 || TREE_CODE (slen
) != INTEGER_CST
)
2057 slen
= size_binop (PLUS_EXPR
, slen
, ssize_int (1));
2059 /* We're required to pad with trailing zeros if the requested
2060 len is greater than strlen(s2)+1. In that case try to
2061 use store_by_pieces, if it fails, punt. */
2062 if (tree_int_cst_lt (slen
, len
))
2064 tree dest
= TREE_VALUE (arglist
);
2065 unsigned int dest_align
2066 = get_pointer_alignment (dest
, BIGGEST_ALIGNMENT
);
2067 const char *p
= c_getstr (TREE_VALUE (TREE_CHAIN (arglist
)));
2070 if (!p
|| dest_align
== 0 || !host_integerp (len
, 1)
2071 || !can_store_by_pieces (tree_low_cst (len
, 1),
2072 builtin_strncpy_read_str
,
2073 (PTR
) p
, dest_align
))
2076 dest_mem
= get_memory_rtx (dest
);
2077 store_by_pieces (dest_mem
, tree_low_cst (len
, 1),
2078 builtin_strncpy_read_str
,
2079 (PTR
) p
, dest_align
);
2080 return force_operand (XEXP (dest_mem
, 0), NULL_RTX
);
2083 /* OK transform into builtin memcpy. */
2084 return expand_builtin_memcpy (arglist
);
2088 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
2089 bytes from constant string DATA + OFFSET and return it as target
2093 builtin_memset_read_str (data
, offset
, mode
)
2095 HOST_WIDE_INT offset ATTRIBUTE_UNUSED
;
2096 enum machine_mode mode
;
2098 const char *c
= (const char *) data
;
2099 char *p
= alloca (GET_MODE_SIZE (mode
));
2101 memset (p
, *c
, GET_MODE_SIZE (mode
));
2103 return c_readstr (p
, mode
);
2106 /* Expand expression EXP, which is a call to the memset builtin. Return 0
2107 if we failed the caller should emit a normal call. */
2110 expand_builtin_memset (exp
)
2113 tree arglist
= TREE_OPERAND (exp
, 1);
2115 if (!validate_arglist (arglist
,
2116 POINTER_TYPE
, INTEGER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
2120 tree dest
= TREE_VALUE (arglist
);
2121 tree val
= TREE_VALUE (TREE_CHAIN (arglist
));
2122 tree len
= TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist
)));
2125 unsigned int dest_align
2126 = get_pointer_alignment (dest
, BIGGEST_ALIGNMENT
);
2127 rtx dest_mem
, dest_addr
, len_rtx
;
2129 /* If DEST is not a pointer type, don't do this
2130 operation in-line. */
2131 if (dest_align
== 0)
2134 if (TREE_CODE (val
) != INTEGER_CST
)
2137 if (target_char_cast (val
, &c
))
2142 if (!host_integerp (len
, 1))
2144 if (!can_store_by_pieces (tree_low_cst (len
, 1),
2145 builtin_memset_read_str
, (PTR
) &c
,
2149 dest_mem
= get_memory_rtx (dest
);
2150 store_by_pieces (dest_mem
, tree_low_cst (len
, 1),
2151 builtin_memset_read_str
,
2152 (PTR
) &c
, dest_align
);
2153 return force_operand (XEXP (dest_mem
, 0), NULL_RTX
);
2156 len_rtx
= expand_expr (len
, NULL_RTX
, VOIDmode
, 0);
2158 dest_mem
= get_memory_rtx (dest
);
2159 set_mem_align (dest_mem
, dest_align
);
2160 dest_addr
= clear_storage (dest_mem
, len_rtx
);
2163 dest_addr
= force_operand (XEXP (dest_mem
, 0), NULL_RTX
);
2169 /* Expand expression EXP, which is a call to the bzero builtin. Return 0
2170 if we failed the caller should emit a normal call. */
2173 expand_builtin_bzero (exp
)
2176 tree arglist
= TREE_OPERAND (exp
, 1);
2177 tree dest
, size
, newarglist
;
2180 if (!validate_arglist (arglist
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
2183 dest
= TREE_VALUE (arglist
);
2184 size
= TREE_VALUE (TREE_CHAIN (arglist
));
2186 /* New argument list transforming bzero(ptr x, int y) to
2187 memset(ptr x, int 0, size_t y). */
2189 newarglist
= build_tree_list (NULL_TREE
, convert (sizetype
, size
));
2190 newarglist
= tree_cons (NULL_TREE
, integer_zero_node
, newarglist
);
2191 newarglist
= tree_cons (NULL_TREE
, dest
, newarglist
);
2193 TREE_OPERAND (exp
, 1) = newarglist
;
2194 result
= expand_builtin_memset(exp
);
2196 /* Always restore the original arguments. */
2197 TREE_OPERAND (exp
, 1) = arglist
;
2202 #ifdef HAVE_cmpstrsi
2204 /* Expand expression EXP, which is a call to the memcmp or the strcmp builtin.
2205 ARGLIST is the argument list for this call. Return 0 if we failed and the
2206 caller should emit a normal call, otherwise try to get the result in
2207 TARGET, if convenient. */
2210 expand_builtin_memcmp (exp
, arglist
, target
)
2215 if (!validate_arglist (arglist
,
2216 POINTER_TYPE
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
2220 enum machine_mode mode
;
2221 tree arg1
= TREE_VALUE (arglist
);
2222 tree arg2
= TREE_VALUE (TREE_CHAIN (arglist
));
2223 tree len
= TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist
)));
2224 rtx arg1_rtx
, arg2_rtx
, arg3_rtx
;
2229 = get_pointer_alignment (arg1
, BIGGEST_ALIGNMENT
) / BITS_PER_UNIT
;
2231 = get_pointer_alignment (arg2
, BIGGEST_ALIGNMENT
) / BITS_PER_UNIT
;
2232 enum machine_mode insn_mode
2233 = insn_data
[(int) CODE_FOR_cmpstrsi
].operand
[0].mode
;
2235 /* If we don't have POINTER_TYPE, call the function. */
2236 if (arg1_align
== 0 || arg2_align
== 0)
2239 /* Make a place to write the result of the instruction. */
2242 && GET_CODE (result
) == REG
&& GET_MODE (result
) == insn_mode
2243 && REGNO (result
) >= FIRST_PSEUDO_REGISTER
))
2244 result
= gen_reg_rtx (insn_mode
);
2246 arg1_rtx
= get_memory_rtx (arg1
);
2247 arg2_rtx
= get_memory_rtx (arg2
);
2248 arg3_rtx
= expand_expr (len
, NULL_RTX
, VOIDmode
, 0);
2252 insn
= gen_cmpstrsi (result
, arg1_rtx
, arg2_rtx
, arg3_rtx
,
2253 GEN_INT (MIN (arg1_align
, arg2_align
)));
2258 emit_library_call_value (memcmp_libfunc
, result
, LCT_PURE_MAKE_BLOCK
,
2259 TYPE_MODE (integer_type_node
), 3,
2260 XEXP (arg1_rtx
, 0), Pmode
,
2261 XEXP (arg2_rtx
, 0), Pmode
,
2262 convert_to_mode (TYPE_MODE (sizetype
), arg3_rtx
,
2263 TREE_UNSIGNED (sizetype
)),
2264 TYPE_MODE (sizetype
));
2266 /* Return the value in the proper mode for this function. */
2267 mode
= TYPE_MODE (TREE_TYPE (exp
));
2268 if (GET_MODE (result
) == mode
)
2270 else if (target
!= 0)
2272 convert_move (target
, result
, 0);
2276 return convert_to_mode (mode
, result
, 0);
2281 /* Expand expression EXP, which is a call to the strcmp builtin. Return 0
2282 if we failed the caller should emit a normal call, otherwise try to get
2283 the result in TARGET, if convenient. */
2286 expand_builtin_strcmp (exp
, target
, mode
)
2289 enum machine_mode mode
;
2291 tree arglist
= TREE_OPERAND (exp
, 1);
2293 const char *p1
, *p2
;
2295 if (!validate_arglist (arglist
, POINTER_TYPE
, POINTER_TYPE
, VOID_TYPE
))
2298 arg1
= TREE_VALUE (arglist
);
2299 arg2
= TREE_VALUE (TREE_CHAIN (arglist
));
2301 p1
= c_getstr (arg1
);
2302 p2
= c_getstr (arg2
);
2306 const int i
= strcmp (p1
, p2
);
2307 return (i
< 0 ? constm1_rtx
: (i
> 0 ? const1_rtx
: const0_rtx
));
2310 /* If either arg is "", return an expression corresponding to
2311 (*(const unsigned char*)arg1 - (const unsigned char*)arg2). */
2312 if ((p1
&& *p1
== '\0') || (p2
&& *p2
== '\0'))
2314 tree cst_uchar_node
= build_type_variant (unsigned_char_type_node
, 1, 0);
2315 tree cst_uchar_ptr_node
= build_pointer_type (cst_uchar_node
);
2317 fold (build1 (CONVERT_EXPR
, integer_type_node
,
2318 build1 (INDIRECT_REF
, cst_uchar_node
,
2319 build1 (NOP_EXPR
, cst_uchar_ptr_node
, arg1
))));
2321 fold (build1 (CONVERT_EXPR
, integer_type_node
,
2322 build1 (INDIRECT_REF
, cst_uchar_node
,
2323 build1 (NOP_EXPR
, cst_uchar_ptr_node
, arg2
))));
2324 tree result
= fold (build (MINUS_EXPR
, integer_type_node
, ind1
, ind2
));
2325 return expand_expr (result
, target
, mode
, EXPAND_NORMAL
);
2328 #ifdef HAVE_cmpstrsi
2329 if (! HAVE_cmpstrsi
)
2333 tree len
= c_strlen (arg1
);
2334 tree len2
= c_strlen (arg2
);
2338 len
= size_binop (PLUS_EXPR
, ssize_int (1), len
);
2341 len2
= size_binop (PLUS_EXPR
, ssize_int (1), len2
);
2343 /* If we don't have a constant length for the first, use the length
2344 of the second, if we know it. We don't require a constant for
2345 this case; some cost analysis could be done if both are available
2346 but neither is constant. For now, assume they're equally cheap
2347 unless one has side effects.
2349 If both strings have constant lengths, use the smaller. This
2350 could arise if optimization results in strcpy being called with
2351 two fixed strings, or if the code was machine-generated. We should
2352 add some code to the `memcmp' handler below to deal with such
2353 situations, someday. */
2355 if (!len
|| TREE_CODE (len
) != INTEGER_CST
)
2357 if (len2
&& !TREE_SIDE_EFFECTS (len2
))
2362 else if (len2
&& TREE_CODE (len2
) == INTEGER_CST
2363 && tree_int_cst_lt (len2
, len
))
2366 /* If both arguments have side effects, we cannot optimize. */
2367 if (TREE_SIDE_EFFECTS (len
))
2370 chainon (arglist
, build_tree_list (NULL_TREE
, len
));
2371 result
= expand_builtin_memcmp (exp
, arglist
, target
);
2373 TREE_CHAIN (TREE_CHAIN (arglist
)) = 0;
2382 /* Expand expression EXP, which is a call to the strncmp builtin. Return 0
2383 if we failed the caller should emit a normal call, otherwise try to get
2384 the result in TARGET, if convenient. */
2387 expand_builtin_strncmp (exp
, target
, mode
)
2390 enum machine_mode mode
;
2392 tree arglist
= TREE_OPERAND (exp
, 1);
2393 tree arg1
, arg2
, arg3
;
2394 const char *p1
, *p2
;
2396 if (!validate_arglist (arglist
,
2397 POINTER_TYPE
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
2400 arg1
= TREE_VALUE (arglist
);
2401 arg2
= TREE_VALUE (TREE_CHAIN (arglist
));
2402 arg3
= TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist
)));
2404 /* If the len parameter is zero, return zero. */
2405 if (host_integerp (arg3
, 1) && tree_low_cst (arg3
, 1) == 0)
2407 /* Evaluate and ignore arg1 and arg2 in case they have
2409 expand_expr (arg1
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2410 expand_expr (arg2
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2414 p1
= c_getstr (arg1
);
2415 p2
= c_getstr (arg2
);
2417 /* If all arguments are constant, evaluate at compile-time. */
2418 if (host_integerp (arg3
, 1) && p1
&& p2
)
2420 const int r
= strncmp (p1
, p2
, tree_low_cst (arg3
, 1));
2421 return (r
< 0 ? constm1_rtx
: (r
> 0 ? const1_rtx
: const0_rtx
));
2424 /* If len == 1 or (either string parameter is "" and (len >= 1)),
2425 return (*(const u_char*)arg1 - *(const u_char*)arg2). */
2426 if (host_integerp (arg3
, 1)
2427 && (tree_low_cst (arg3
, 1) == 1
2428 || (tree_low_cst (arg3
, 1) > 1
2429 && ((p1
&& *p1
== '\0') || (p2
&& *p2
== '\0')))))
2431 tree cst_uchar_node
= build_type_variant (unsigned_char_type_node
, 1, 0);
2432 tree cst_uchar_ptr_node
= build_pointer_type (cst_uchar_node
);
2434 fold (build1 (CONVERT_EXPR
, integer_type_node
,
2435 build1 (INDIRECT_REF
, cst_uchar_node
,
2436 build1 (NOP_EXPR
, cst_uchar_ptr_node
, arg1
))));
2438 fold (build1 (CONVERT_EXPR
, integer_type_node
,
2439 build1 (INDIRECT_REF
, cst_uchar_node
,
2440 build1 (NOP_EXPR
, cst_uchar_ptr_node
, arg2
))));
2441 tree result
= fold (build (MINUS_EXPR
, integer_type_node
, ind1
, ind2
));
2442 return expand_expr (result
, target
, mode
, EXPAND_NORMAL
);
2445 #ifdef HAVE_cmpstrsi
2446 /* If c_strlen can determine an expression for one of the string
2447 lengths, and it doesn't have side effects, then call
2448 expand_builtin_memcmp() using length MIN(strlen(string)+1, arg3). */
2451 tree newarglist
, len
= 0;
2453 /* Perhaps one of the strings is really constant, if so prefer
2454 that constant length over the other string's length. */
2456 len
= c_strlen (arg1
);
2458 len
= c_strlen (arg2
);
2460 /* If we still don't have a len, try either string arg as long
2461 as they don't have side effects. */
2462 if (!len
&& !TREE_SIDE_EFFECTS (arg1
))
2463 len
= c_strlen (arg1
);
2464 if (!len
&& !TREE_SIDE_EFFECTS (arg2
))
2465 len
= c_strlen (arg2
);
2466 /* If we still don't have a length, punt. */
2470 /* Add one to the string length. */
2471 len
= fold (size_binop (PLUS_EXPR
, len
, ssize_int (1)));
2473 /* The actual new length parameter is MIN(len,arg3). */
2474 len
= fold (build (MIN_EXPR
, TREE_TYPE (len
), len
, arg3
));
2476 newarglist
= build_tree_list (NULL_TREE
, len
);
2477 newarglist
= tree_cons (NULL_TREE
, arg2
, newarglist
);
2478 newarglist
= tree_cons (NULL_TREE
, arg1
, newarglist
);
2479 return expand_builtin_memcmp (exp
, newarglist
, target
);
2486 /* Expand expression EXP, which is a call to the strcat builtin.
2487 Return 0 if we failed the caller should emit a normal call,
2488 otherwise try to get the result in TARGET, if convenient. */
2491 expand_builtin_strcat (arglist
, target
, mode
)
2494 enum machine_mode mode
;
2496 if (!validate_arglist (arglist
, POINTER_TYPE
, POINTER_TYPE
, VOID_TYPE
))
2500 tree dst
= TREE_VALUE (arglist
),
2501 src
= TREE_VALUE (TREE_CHAIN (arglist
));
2502 const char *p
= c_getstr (src
);
2504 /* If the string length is zero, return the dst parameter. */
2505 if (p
&& *p
== '\0')
2506 return expand_expr (dst
, target
, mode
, EXPAND_NORMAL
);
2512 /* Expand expression EXP, which is a call to the strncat builtin.
2513 Return 0 if we failed the caller should emit a normal call,
2514 otherwise try to get the result in TARGET, if convenient. */
2517 expand_builtin_strncat (arglist
, target
, mode
)
2520 enum machine_mode mode
;
2522 if (!validate_arglist (arglist
,
2523 POINTER_TYPE
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
2527 tree dst
= TREE_VALUE (arglist
),
2528 src
= TREE_VALUE (TREE_CHAIN (arglist
)),
2529 len
= TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist
)));
2530 const char *p
= c_getstr (src
);
2532 /* If the requested length is zero, or the src parameter string
2533 length is zero, return the dst parameter. */
2534 if ((TREE_CODE (len
) == INTEGER_CST
&& compare_tree_int (len
, 0) == 0)
2535 || (p
&& *p
== '\0'))
2537 /* Evaluate and ignore the src and len parameters in case
2538 they have side-effects. */
2539 expand_expr (src
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2540 expand_expr (len
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2541 return expand_expr (dst
, target
, mode
, EXPAND_NORMAL
);
2544 /* If the requested len is greater than or equal to the string
2545 length, call strcat. */
2546 if (TREE_CODE (len
) == INTEGER_CST
&& p
2547 && compare_tree_int (len
, strlen (p
)) >= 0)
2550 tree_cons (NULL_TREE
, dst
, build_tree_list (NULL_TREE
, src
)),
2551 fn
= built_in_decls
[BUILT_IN_STRCAT
];
2553 /* If the replacement _DECL isn't initialized, don't do the
2558 return expand_expr (build_function_call_expr (fn
, newarglist
),
2559 target
, mode
, EXPAND_NORMAL
);
2565 /* Expand expression EXP, which is a call to the strspn builtin.
2566 Return 0 if we failed the caller should emit a normal call,
2567 otherwise try to get the result in TARGET, if convenient. */
2570 expand_builtin_strspn (arglist
, target
, mode
)
2573 enum machine_mode mode
;
2575 if (!validate_arglist (arglist
, POINTER_TYPE
, POINTER_TYPE
, VOID_TYPE
))
2579 tree s1
= TREE_VALUE (arglist
), s2
= TREE_VALUE (TREE_CHAIN (arglist
));
2580 const char *p1
= c_getstr (s1
), *p2
= c_getstr (s2
);
2582 /* If both arguments are constants, evaluate at compile-time. */
2585 const size_t r
= strspn (p1
, p2
);
2586 return expand_expr (size_int (r
), target
, mode
, EXPAND_NORMAL
);
2589 /* If either argument is "", return 0. */
2590 if ((p1
&& *p1
== '\0') || (p2
&& *p2
== '\0'))
2592 /* Evaluate and ignore both arguments in case either one has
2594 expand_expr (s1
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2595 expand_expr (s2
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2602 /* Expand expression EXP, which is a call to the strcspn builtin.
2603 Return 0 if we failed the caller should emit a normal call,
2604 otherwise try to get the result in TARGET, if convenient. */
2607 expand_builtin_strcspn (arglist
, target
, mode
)
2610 enum machine_mode mode
;
2612 if (!validate_arglist (arglist
, POINTER_TYPE
, POINTER_TYPE
, VOID_TYPE
))
2616 tree s1
= TREE_VALUE (arglist
), s2
= TREE_VALUE (TREE_CHAIN (arglist
));
2617 const char *p1
= c_getstr (s1
), *p2
= c_getstr (s2
);
2619 /* If both arguments are constants, evaluate at compile-time. */
2622 const size_t r
= strcspn (p1
, p2
);
2623 return expand_expr (size_int (r
), target
, mode
, EXPAND_NORMAL
);
2626 /* If the first argument is "", return 0. */
2627 if (p1
&& *p1
== '\0')
2629 /* Evaluate and ignore argument s2 in case it has
2631 expand_expr (s2
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2635 /* If the second argument is "", return __builtin_strlen(s1). */
2636 if (p2
&& *p2
== '\0')
2638 tree newarglist
= build_tree_list (NULL_TREE
, s1
),
2639 fn
= built_in_decls
[BUILT_IN_STRLEN
];
2641 /* If the replacement _DECL isn't initialized, don't do the
2646 return expand_expr (build_function_call_expr (fn
, newarglist
),
2647 target
, mode
, EXPAND_NORMAL
);
2653 /* Expand a call to __builtin_saveregs, generating the result in TARGET,
2654 if that's convenient. */
2657 expand_builtin_saveregs ()
2661 /* Don't do __builtin_saveregs more than once in a function.
2662 Save the result of the first call and reuse it. */
2663 if (saveregs_value
!= 0)
2664 return saveregs_value
;
2666 /* When this function is called, it means that registers must be
2667 saved on entry to this function. So we migrate the call to the
2668 first insn of this function. */
2672 #ifdef EXPAND_BUILTIN_SAVEREGS
2673 /* Do whatever the machine needs done in this case. */
2674 val
= EXPAND_BUILTIN_SAVEREGS ();
2676 /* ??? We used to try and build up a call to the out of line function,
2677 guessing about what registers needed saving etc. This became much
2678 harder with __builtin_va_start, since we don't have a tree for a
2679 call to __builtin_saveregs to fall back on. There was exactly one
2680 port (i860) that used this code, and I'm unconvinced it could actually
2681 handle the general case. So we no longer try to handle anything
2682 weird and make the backend absorb the evil. */
2684 error ("__builtin_saveregs not supported by this target");
2691 saveregs_value
= val
;
2693 /* Put the sequence after the NOTE that starts the function. If this
2694 is inside a SEQUENCE, make the outer-level insn chain current, so
2695 the code is placed at the start of the function. */
2696 push_topmost_sequence ();
2697 emit_insns_after (seq
, get_insns ());
2698 pop_topmost_sequence ();
2703 /* __builtin_args_info (N) returns word N of the arg space info
2704 for the current function. The number and meanings of words
2705 is controlled by the definition of CUMULATIVE_ARGS. */
2708 expand_builtin_args_info (exp
)
2711 tree arglist
= TREE_OPERAND (exp
, 1);
2712 int nwords
= sizeof (CUMULATIVE_ARGS
) / sizeof (int);
2713 int *word_ptr
= (int *) ¤t_function_args_info
;
2715 /* These are used by the code below that is if 0'ed away */
2717 tree type
, elts
, result
;
2720 if (sizeof (CUMULATIVE_ARGS
) % sizeof (int) != 0)
2725 if (!host_integerp (TREE_VALUE (arglist
), 0))
2726 error ("argument of `__builtin_args_info' must be constant");
2729 HOST_WIDE_INT wordnum
= tree_low_cst (TREE_VALUE (arglist
), 0);
2731 if (wordnum
< 0 || wordnum
>= nwords
)
2732 error ("argument of `__builtin_args_info' out of range");
2734 return GEN_INT (word_ptr
[wordnum
]);
2738 error ("missing argument in `__builtin_args_info'");
2743 for (i
= 0; i
< nwords
; i
++)
2744 elts
= tree_cons (NULL_TREE
, build_int_2 (word_ptr
[i
], 0));
2746 type
= build_array_type (integer_type_node
,
2747 build_index_type (build_int_2 (nwords
, 0)));
2748 result
= build (CONSTRUCTOR
, type
, NULL_TREE
, nreverse (elts
));
2749 TREE_CONSTANT (result
) = 1;
2750 TREE_STATIC (result
) = 1;
2751 result
= build1 (INDIRECT_REF
, build_pointer_type (type
), result
);
2752 TREE_CONSTANT (result
) = 1;
2753 return expand_expr (result
, NULL_RTX
, VOIDmode
, 0);
2757 /* Expand ARGLIST, from a call to __builtin_next_arg. */
2760 expand_builtin_next_arg (arglist
)
2763 tree fntype
= TREE_TYPE (current_function_decl
);
2765 if ((TYPE_ARG_TYPES (fntype
) == 0
2766 || (TREE_VALUE (tree_last (TYPE_ARG_TYPES (fntype
)))
2768 && ! current_function_varargs
)
2770 error ("`va_start' used in function with fixed args");
2776 tree last_parm
= tree_last (DECL_ARGUMENTS (current_function_decl
));
2777 tree arg
= TREE_VALUE (arglist
);
2779 /* Strip off all nops for the sake of the comparison. This
2780 is not quite the same as STRIP_NOPS. It does more.
2781 We must also strip off INDIRECT_EXPR for C++ reference
2783 while (TREE_CODE (arg
) == NOP_EXPR
2784 || TREE_CODE (arg
) == CONVERT_EXPR
2785 || TREE_CODE (arg
) == NON_LVALUE_EXPR
2786 || TREE_CODE (arg
) == INDIRECT_REF
)
2787 arg
= TREE_OPERAND (arg
, 0);
2788 if (arg
!= last_parm
)
2789 warning ("second parameter of `va_start' not last named argument");
2791 else if (! current_function_varargs
)
2792 /* Evidently an out of date version of <stdarg.h>; can't validate
2793 va_start's second argument, but can still work as intended. */
2794 warning ("`__builtin_next_arg' called without an argument");
2796 return expand_binop (Pmode
, add_optab
,
2797 current_function_internal_arg_pointer
,
2798 current_function_arg_offset_rtx
,
2799 NULL_RTX
, 0, OPTAB_LIB_WIDEN
);
2802 /* Make it easier for the backends by protecting the valist argument
2803 from multiple evaluations. */
2806 stabilize_va_list (valist
, needs_lvalue
)
2810 if (TREE_CODE (va_list_type_node
) == ARRAY_TYPE
)
2812 if (TREE_SIDE_EFFECTS (valist
))
2813 valist
= save_expr (valist
);
2815 /* For this case, the backends will be expecting a pointer to
2816 TREE_TYPE (va_list_type_node), but it's possible we've
2817 actually been given an array (an actual va_list_type_node).
2819 if (TREE_CODE (TREE_TYPE (valist
)) == ARRAY_TYPE
)
2821 tree p1
= build_pointer_type (TREE_TYPE (va_list_type_node
));
2822 tree p2
= build_pointer_type (va_list_type_node
);
2824 valist
= build1 (ADDR_EXPR
, p2
, valist
);
2825 valist
= fold (build1 (NOP_EXPR
, p1
, valist
));
2834 if (! TREE_SIDE_EFFECTS (valist
))
2837 pt
= build_pointer_type (va_list_type_node
);
2838 valist
= fold (build1 (ADDR_EXPR
, pt
, valist
));
2839 TREE_SIDE_EFFECTS (valist
) = 1;
2842 if (TREE_SIDE_EFFECTS (valist
))
2843 valist
= save_expr (valist
);
2844 valist
= fold (build1 (INDIRECT_REF
, TREE_TYPE (TREE_TYPE (valist
)),
2851 /* The "standard" implementation of va_start: just assign `nextarg' to
2855 std_expand_builtin_va_start (stdarg_p
, valist
, nextarg
)
2864 /* The dummy named parameter is declared as a 'word' sized
2865 object, but if a 'word' is smaller than an 'int', it would
2866 have been promoted to int when it was added to the arglist. */
2867 int align
= PARM_BOUNDARY
/ BITS_PER_UNIT
;
2868 int size
= MAX (UNITS_PER_WORD
,
2869 GET_MODE_SIZE (TYPE_MODE (integer_type_node
)));
2870 int offset
= ((size
+ align
- 1) / align
) * align
;
2871 nextarg
= plus_constant (nextarg
, -offset
);
2874 t
= build (MODIFY_EXPR
, TREE_TYPE (valist
), valist
,
2875 make_tree (ptr_type_node
, nextarg
));
2876 TREE_SIDE_EFFECTS (t
) = 1;
2878 expand_expr (t
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2881 /* Expand ARGLIST, which from a call to __builtin_stdarg_va_start or
2882 __builtin_varargs_va_start, depending on STDARG_P. */
2885 expand_builtin_va_start (stdarg_p
, arglist
)
2890 tree chain
= arglist
, valist
;
2893 nextarg
= expand_builtin_next_arg (chain
= TREE_CHAIN (arglist
));
2895 nextarg
= expand_builtin_next_arg (NULL_TREE
);
2897 if (TREE_CHAIN (chain
))
2898 error ("too many arguments to function `va_start'");
2900 valist
= stabilize_va_list (TREE_VALUE (arglist
), 1);
2902 #ifdef EXPAND_BUILTIN_VA_START
2903 EXPAND_BUILTIN_VA_START (stdarg_p
, valist
, nextarg
);
2905 std_expand_builtin_va_start (stdarg_p
, valist
, nextarg
);
2911 /* The "standard" implementation of va_arg: read the value from the
2912 current (padded) address and increment by the (padded) size. */
2915 std_expand_builtin_va_arg (valist
, type
)
2919 HOST_WIDE_INT align
;
2920 HOST_WIDE_INT rounded_size
;
2923 /* Compute the rounded size of the type. */
2924 align
= PARM_BOUNDARY
/ BITS_PER_UNIT
;
2925 rounded_size
= (((int_size_in_bytes (type
) + align
- 1) / align
) * align
);
2929 if (PAD_VARARGS_DOWN
)
2931 /* Small args are padded downward. */
2934 = rounded_size
> align
? rounded_size
: int_size_in_bytes (type
);
2936 addr_tree
= build (PLUS_EXPR
, TREE_TYPE (addr_tree
), addr_tree
,
2937 build_int_2 (rounded_size
- adj
, 0));
2940 addr
= expand_expr (addr_tree
, NULL_RTX
, Pmode
, EXPAND_NORMAL
);
2941 addr
= copy_to_reg (addr
);
2943 /* Compute new value for AP. */
2944 t
= build (MODIFY_EXPR
, TREE_TYPE (valist
), valist
,
2945 build (PLUS_EXPR
, TREE_TYPE (valist
), valist
,
2946 build_int_2 (rounded_size
, 0)));
2947 TREE_SIDE_EFFECTS (t
) = 1;
2948 expand_expr (t
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2953 /* Expand __builtin_va_arg, which is not really a builtin function, but
2954 a very special sort of operator. */
2957 expand_builtin_va_arg (valist
, type
)
2961 tree promoted_type
, want_va_type
, have_va_type
;
2963 /* Verify that valist is of the proper type. */
2965 want_va_type
= va_list_type_node
;
2966 have_va_type
= TREE_TYPE (valist
);
2967 if (TREE_CODE (want_va_type
) == ARRAY_TYPE
)
2969 /* If va_list is an array type, the argument may have decayed
2970 to a pointer type, e.g. by being passed to another function.
2971 In that case, unwrap both types so that we can compare the
2972 underlying records. */
2973 if (TREE_CODE (have_va_type
) == ARRAY_TYPE
2974 || TREE_CODE (have_va_type
) == POINTER_TYPE
)
2976 want_va_type
= TREE_TYPE (want_va_type
);
2977 have_va_type
= TREE_TYPE (have_va_type
);
2980 if (TYPE_MAIN_VARIANT (want_va_type
) != TYPE_MAIN_VARIANT (have_va_type
))
2982 error ("first argument to `va_arg' not of type `va_list'");
2986 /* Generate a diagnostic for requesting data of a type that cannot
2987 be passed through `...' due to type promotion at the call site. */
2988 else if ((promoted_type
= (*lang_type_promotes_to
) (type
)) != NULL_TREE
)
2990 const char *name
= "<anonymous type>", *pname
= 0;
2991 static int gave_help
;
2993 if (TYPE_NAME (type
))
2995 if (TREE_CODE (TYPE_NAME (type
)) == IDENTIFIER_NODE
)
2996 name
= IDENTIFIER_POINTER (TYPE_NAME (type
));
2997 else if (TREE_CODE (TYPE_NAME (type
)) == TYPE_DECL
2998 && DECL_NAME (TYPE_NAME (type
)))
2999 name
= IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type
)));
3001 if (TYPE_NAME (promoted_type
))
3003 if (TREE_CODE (TYPE_NAME (promoted_type
)) == IDENTIFIER_NODE
)
3004 pname
= IDENTIFIER_POINTER (TYPE_NAME (promoted_type
));
3005 else if (TREE_CODE (TYPE_NAME (promoted_type
)) == TYPE_DECL
3006 && DECL_NAME (TYPE_NAME (promoted_type
)))
3007 pname
= IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (promoted_type
)));
3010 error ("`%s' is promoted to `%s' when passed through `...'", name
, pname
);
3014 error ("(so you should pass `%s' not `%s' to `va_arg')", pname
, name
);
3021 /* Make it easier for the backends by protecting the valist argument
3022 from multiple evaluations. */
3023 valist
= stabilize_va_list (valist
, 0);
3025 #ifdef EXPAND_BUILTIN_VA_ARG
3026 addr
= EXPAND_BUILTIN_VA_ARG (valist
, type
);
3028 addr
= std_expand_builtin_va_arg (valist
, type
);
3032 #ifdef POINTERS_EXTEND_UNSIGNED
3033 if (GET_MODE (addr
) != Pmode
)
3034 addr
= convert_memory_address (Pmode
, addr
);
3037 result
= gen_rtx_MEM (TYPE_MODE (type
), addr
);
3038 set_mem_alias_set (result
, get_varargs_alias_set ());
3043 /* Expand ARGLIST, from a call to __builtin_va_end. */
3046 expand_builtin_va_end (arglist
)
3049 tree valist
= TREE_VALUE (arglist
);
3051 #ifdef EXPAND_BUILTIN_VA_END
3052 valist
= stabilize_va_list (valist
, 0);
3053 EXPAND_BUILTIN_VA_END(arglist
);
3055 /* Evaluate for side effects, if needed. I hate macros that don't
3057 if (TREE_SIDE_EFFECTS (valist
))
3058 expand_expr (valist
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
3064 /* Expand ARGLIST, from a call to __builtin_va_copy. We do this as a
3065 builtin rather than just as an assignment in stdarg.h because of the
3066 nastiness of array-type va_list types. */
3069 expand_builtin_va_copy (arglist
)
3074 dst
= TREE_VALUE (arglist
);
3075 src
= TREE_VALUE (TREE_CHAIN (arglist
));
3077 dst
= stabilize_va_list (dst
, 1);
3078 src
= stabilize_va_list (src
, 0);
3080 if (TREE_CODE (va_list_type_node
) != ARRAY_TYPE
)
3082 t
= build (MODIFY_EXPR
, va_list_type_node
, dst
, src
);
3083 TREE_SIDE_EFFECTS (t
) = 1;
3084 expand_expr (t
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
3088 rtx dstb
, srcb
, size
;
3090 /* Evaluate to pointers. */
3091 dstb
= expand_expr (dst
, NULL_RTX
, Pmode
, EXPAND_NORMAL
);
3092 srcb
= expand_expr (src
, NULL_RTX
, Pmode
, EXPAND_NORMAL
);
3093 size
= expand_expr (TYPE_SIZE_UNIT (va_list_type_node
), NULL_RTX
,
3094 VOIDmode
, EXPAND_NORMAL
);
3096 #ifdef POINTERS_EXTEND_UNSIGNED
3097 if (GET_MODE (dstb
) != Pmode
)
3098 dstb
= convert_memory_address (Pmode
, dstb
);
3100 if (GET_MODE (srcb
) != Pmode
)
3101 srcb
= convert_memory_address (Pmode
, srcb
);
3104 /* "Dereference" to BLKmode memories. */
3105 dstb
= gen_rtx_MEM (BLKmode
, dstb
);
3106 set_mem_alias_set (dstb
, get_alias_set (TREE_TYPE (TREE_TYPE (dst
))));
3107 set_mem_align (dstb
, TYPE_ALIGN (va_list_type_node
));
3108 srcb
= gen_rtx_MEM (BLKmode
, srcb
);
3109 set_mem_alias_set (srcb
, get_alias_set (TREE_TYPE (TREE_TYPE (src
))));
3110 set_mem_align (srcb
, TYPE_ALIGN (va_list_type_node
));
3113 emit_block_move (dstb
, srcb
, size
);
3119 /* Expand a call to one of the builtin functions __builtin_frame_address or
3120 __builtin_return_address. */
3123 expand_builtin_frame_address (exp
)
3126 tree fndecl
= TREE_OPERAND (TREE_OPERAND (exp
, 0), 0);
3127 tree arglist
= TREE_OPERAND (exp
, 1);
3129 /* The argument must be a nonnegative integer constant.
3130 It counts the number of frames to scan up the stack.
3131 The value is the return address saved in that frame. */
3133 /* Warning about missing arg was already issued. */
3135 else if (! host_integerp (TREE_VALUE (arglist
), 1))
3137 if (DECL_FUNCTION_CODE (fndecl
) == BUILT_IN_FRAME_ADDRESS
)
3138 error ("invalid arg to `__builtin_frame_address'");
3140 error ("invalid arg to `__builtin_return_address'");
3146 = expand_builtin_return_addr (DECL_FUNCTION_CODE (fndecl
),
3147 tree_low_cst (TREE_VALUE (arglist
), 1),
3148 hard_frame_pointer_rtx
);
3150 /* Some ports cannot access arbitrary stack frames. */
3153 if (DECL_FUNCTION_CODE (fndecl
) == BUILT_IN_FRAME_ADDRESS
)
3154 warning ("unsupported arg to `__builtin_frame_address'");
3156 warning ("unsupported arg to `__builtin_return_address'");
3160 /* For __builtin_frame_address, return what we've got. */
3161 if (DECL_FUNCTION_CODE (fndecl
) == BUILT_IN_FRAME_ADDRESS
)
3164 if (GET_CODE (tem
) != REG
3165 && ! CONSTANT_P (tem
))
3166 tem
= copy_to_mode_reg (Pmode
, tem
);
3171 /* Expand a call to the alloca builtin, with arguments ARGLIST. Return 0 if
3172 we failed and the caller should emit a normal call, otherwise try to get
3173 the result in TARGET, if convenient. */
3176 expand_builtin_alloca (arglist
, target
)
3183 if (!validate_arglist (arglist
, INTEGER_TYPE
, VOID_TYPE
))
3186 /* Compute the argument. */
3187 op0
= expand_expr (TREE_VALUE (arglist
), NULL_RTX
, VOIDmode
, 0);
3189 /* Allocate the desired space. */
3190 result
= allocate_dynamic_stack_space (op0
, target
, BITS_PER_UNIT
);
3192 #ifdef POINTERS_EXTEND_UNSIGNED
3193 if (GET_MODE (result
) != ptr_mode
)
3194 result
= convert_memory_address (ptr_mode
, result
);
3200 /* Expand a call to the ffs builtin. The arguments are in ARGLIST.
3201 Return 0 if a normal call should be emitted rather than expanding the
3202 function in-line. If convenient, the result should be placed in TARGET.
3203 SUBTARGET may be used as the target for computing one of EXP's operands. */
3206 expand_builtin_ffs (arglist
, target
, subtarget
)
3208 rtx target
, subtarget
;
3211 if (!validate_arglist (arglist
, INTEGER_TYPE
, VOID_TYPE
))
3214 /* Compute the argument. */
3215 op0
= expand_expr (TREE_VALUE (arglist
), subtarget
, VOIDmode
, 0);
3216 /* Compute ffs, into TARGET if possible.
3217 Set TARGET to wherever the result comes back. */
3218 target
= expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist
))),
3219 ffs_optab
, op0
, target
, 1);
3225 /* If the string passed to fputs is a constant and is one character
3226 long, we attempt to transform this call into __builtin_fputc(). */
3229 expand_builtin_fputs (arglist
, ignore
)
3233 tree len
, fn
, fn_fputc
= built_in_decls
[BUILT_IN_FPUTC
],
3234 fn_fwrite
= built_in_decls
[BUILT_IN_FWRITE
];
3236 /* If the return value is used, or the replacement _DECL isn't
3237 initialized, don't do the transformation. */
3238 if (!ignore
|| !fn_fputc
|| !fn_fwrite
)
3241 /* Verify the arguments in the original call. */
3242 if (!validate_arglist (arglist
, POINTER_TYPE
, POINTER_TYPE
, VOID_TYPE
))
3245 /* Get the length of the string passed to fputs. If the length
3246 can't be determined, punt. */
3247 if (!(len
= c_strlen (TREE_VALUE (arglist
)))
3248 || TREE_CODE (len
) != INTEGER_CST
)
3251 switch (compare_tree_int (len
, 1))
3253 case -1: /* length is 0, delete the call entirely . */
3255 /* Evaluate and ignore the argument in case it has
3257 expand_expr (TREE_VALUE (TREE_CHAIN (arglist
)), const0_rtx
,
3258 VOIDmode
, EXPAND_NORMAL
);
3261 case 0: /* length is 1, call fputc. */
3263 const char *p
= c_getstr (TREE_VALUE (arglist
));
3267 /* New argument list transforming fputs(string, stream) to
3268 fputc(string[0], stream). */
3270 build_tree_list (NULL_TREE
, TREE_VALUE (TREE_CHAIN (arglist
)));
3272 tree_cons (NULL_TREE
, build_int_2 (p
[0], 0), arglist
);
3278 case 1: /* length is greater than 1, call fwrite. */
3280 tree string_arg
= TREE_VALUE (arglist
);
3282 /* New argument list transforming fputs(string, stream) to
3283 fwrite(string, 1, len, stream). */
3284 arglist
= build_tree_list (NULL_TREE
, TREE_VALUE (TREE_CHAIN (arglist
)));
3285 arglist
= tree_cons (NULL_TREE
, len
, arglist
);
3286 arglist
= tree_cons (NULL_TREE
, size_one_node
, arglist
);
3287 arglist
= tree_cons (NULL_TREE
, string_arg
, arglist
);
3295 return expand_expr (build_function_call_expr (fn
, arglist
),
3296 (ignore
? const0_rtx
: NULL_RTX
),
3297 VOIDmode
, EXPAND_NORMAL
);
3300 /* Expand a call to __builtin_expect. We return our argument and emit a
3301 NOTE_INSN_EXPECTED_VALUE note. This is the expansion of __builtin_expect in
3302 a non-jump context. */
3305 expand_builtin_expect (arglist
, target
)
3312 if (arglist
== NULL_TREE
3313 || TREE_CHAIN (arglist
) == NULL_TREE
)
3315 exp
= TREE_VALUE (arglist
);
3316 c
= TREE_VALUE (TREE_CHAIN (arglist
));
3318 if (TREE_CODE (c
) != INTEGER_CST
)
3320 error ("second arg to `__builtin_expect' must be a constant");
3321 c
= integer_zero_node
;
3324 target
= expand_expr (exp
, target
, VOIDmode
, EXPAND_NORMAL
);
3326 /* Don't bother with expected value notes for integral constants. */
3327 if (GET_CODE (target
) != CONST_INT
)
3329 /* We do need to force this into a register so that we can be
3330 moderately sure to be able to correctly interpret the branch
3332 target
= force_reg (GET_MODE (target
), target
);
3334 rtx_c
= expand_expr (c
, NULL_RTX
, GET_MODE (target
), EXPAND_NORMAL
);
3336 note
= emit_note (NULL
, NOTE_INSN_EXPECTED_VALUE
);
3337 NOTE_EXPECTED_VALUE (note
) = gen_rtx_EQ (VOIDmode
, target
, rtx_c
);
3343 /* Like expand_builtin_expect, except do this in a jump context. This is
3344 called from do_jump if the conditional is a __builtin_expect. Return either
3345 a SEQUENCE of insns to emit the jump or NULL if we cannot optimize
3346 __builtin_expect. We need to optimize this at jump time so that machines
3347 like the PowerPC don't turn the test into a SCC operation, and then jump
3348 based on the test being 0/1. */
3351 expand_builtin_expect_jump (exp
, if_false_label
, if_true_label
)
3356 tree arglist
= TREE_OPERAND (exp
, 1);
3357 tree arg0
= TREE_VALUE (arglist
);
3358 tree arg1
= TREE_VALUE (TREE_CHAIN (arglist
));
3361 /* Only handle __builtin_expect (test, 0) and
3362 __builtin_expect (test, 1). */
3363 if (TREE_CODE (TREE_TYPE (arg1
)) == INTEGER_TYPE
3364 && (integer_zerop (arg1
) || integer_onep (arg1
)))
3369 /* If we fail to locate an appropriate conditional jump, we'll
3370 fall back to normal evaluation. Ensure that the expression
3371 can be re-evaluated. */
3372 switch (unsafe_for_reeval (arg0
))
3377 case 1: /* Mildly unsafe. */
3378 arg0
= unsave_expr (arg0
);
3381 case 2: /* Wildly unsafe. */
3385 /* Expand the jump insns. */
3387 do_jump (arg0
, if_false_label
, if_true_label
);
3388 ret
= gen_sequence ();
3391 /* Now that the __builtin_expect has been validated, go through and add
3392 the expect's to each of the conditional jumps. If we run into an
3393 error, just give up and generate the 'safe' code of doing a SCC
3394 operation and then doing a branch on that. */
3395 for (j
= 0; j
< XVECLEN (ret
, 0); j
++)
3397 rtx insn
= XVECEXP (ret
, 0, j
);
3400 if (GET_CODE (insn
) == JUMP_INSN
&& any_condjump_p (insn
)
3401 && (pattern
= pc_set (insn
)) != NULL_RTX
)
3403 rtx ifelse
= SET_SRC (pattern
);
3407 if (GET_CODE (ifelse
) != IF_THEN_ELSE
)
3410 if (GET_CODE (XEXP (ifelse
, 1)) == LABEL_REF
)
3413 label
= XEXP (XEXP (ifelse
, 1), 0);
3415 /* An inverted jump reverses the probabilities. */
3416 else if (GET_CODE (XEXP (ifelse
, 2)) == LABEL_REF
)
3419 label
= XEXP (XEXP (ifelse
, 2), 0);
3421 /* We shouldn't have to worry about conditional returns during
3422 the expansion stage, but handle it gracefully anyway. */
3423 else if (GET_CODE (XEXP (ifelse
, 1)) == RETURN
)
3428 /* An inverted return reverses the probabilities. */
3429 else if (GET_CODE (XEXP (ifelse
, 2)) == RETURN
)
3437 /* If the test is expected to fail, reverse the
3439 if (integer_zerop (arg1
))
3442 /* If we are jumping to the false label, reverse the
3444 if (label
== NULL_RTX
)
3445 ; /* conditional return */
3446 else if (label
== if_false_label
)
3448 else if (label
!= if_true_label
)
3452 predict_insn_def (insn
, PRED_BUILTIN_EXPECT
, taken
);
3456 /* If no jumps were modified, fail and do __builtin_expect the normal
3465 /* Expand an expression EXP that calls a built-in function,
3466 with result going to TARGET if that's convenient
3467 (and in mode MODE if that's convenient).
3468 SUBTARGET may be used as the target for computing one of EXP's operands.
3469 IGNORE is nonzero if the value is to be ignored. */
3472 expand_builtin (exp
, target
, subtarget
, mode
, ignore
)
3476 enum machine_mode mode
;
3479 tree fndecl
= TREE_OPERAND (TREE_OPERAND (exp
, 0), 0);
3480 tree arglist
= TREE_OPERAND (exp
, 1);
3481 enum built_in_function fcode
= DECL_FUNCTION_CODE (fndecl
);
3483 if (DECL_BUILT_IN_CLASS (fndecl
) == BUILT_IN_MD
)
3484 return (*targetm
.expand_builtin
) (exp
, target
, subtarget
, mode
, ignore
);
3486 /* When not optimizing, generate calls to library functions for a certain
3488 if (!optimize
&& !CALLED_AS_BUILT_IN (fndecl
))
3493 case BUILT_IN_FSQRT
:
3494 case BUILT_IN_SQRTF
:
3495 case BUILT_IN_SQRTL
:
3496 case BUILT_IN_MEMSET
:
3497 case BUILT_IN_MEMCPY
:
3498 case BUILT_IN_MEMCMP
:
3500 case BUILT_IN_BZERO
:
3501 case BUILT_IN_INDEX
:
3502 case BUILT_IN_RINDEX
:
3503 case BUILT_IN_STRCHR
:
3504 case BUILT_IN_STRRCHR
:
3505 case BUILT_IN_STRLEN
:
3506 case BUILT_IN_STRCPY
:
3507 case BUILT_IN_STRNCPY
:
3508 case BUILT_IN_STRNCMP
:
3509 case BUILT_IN_STRSTR
:
3510 case BUILT_IN_STRPBRK
:
3511 case BUILT_IN_STRCAT
:
3512 case BUILT_IN_STRNCAT
:
3513 case BUILT_IN_STRSPN
:
3514 case BUILT_IN_STRCSPN
:
3515 case BUILT_IN_STRCMP
:
3517 case BUILT_IN_PUTCHAR
:
3519 case BUILT_IN_PRINTF
:
3520 case BUILT_IN_FPUTC
:
3521 case BUILT_IN_FPUTS
:
3522 case BUILT_IN_FWRITE
:
3523 return expand_call (exp
, target
, ignore
);
3533 case BUILT_IN_LLABS
:
3534 case BUILT_IN_IMAXABS
:
3536 case BUILT_IN_FABSF
:
3537 case BUILT_IN_FABSL
:
3538 /* build_function_call changes these into ABS_EXPR. */
3542 case BUILT_IN_CONJF
:
3543 case BUILT_IN_CONJL
:
3544 case BUILT_IN_CREAL
:
3545 case BUILT_IN_CREALF
:
3546 case BUILT_IN_CREALL
:
3547 case BUILT_IN_CIMAG
:
3548 case BUILT_IN_CIMAGF
:
3549 case BUILT_IN_CIMAGL
:
3550 /* expand_tree_builtin changes these into CONJ_EXPR, REALPART_EXPR
3551 and IMAGPART_EXPR. */
3560 /* Treat these like sqrt only if unsafe math optimizations are allowed,
3561 because of possible accuracy problems. */
3562 if (! flag_unsafe_math_optimizations
)
3564 case BUILT_IN_FSQRT
:
3565 case BUILT_IN_SQRTF
:
3566 case BUILT_IN_SQRTL
:
3567 target
= expand_builtin_mathfn (exp
, target
, subtarget
);
3575 case BUILT_IN_APPLY_ARGS
:
3576 return expand_builtin_apply_args ();
3578 /* __builtin_apply (FUNCTION, ARGUMENTS, ARGSIZE) invokes
3579 FUNCTION with a copy of the parameters described by
3580 ARGUMENTS, and ARGSIZE. It returns a block of memory
3581 allocated on the stack into which is stored all the registers
3582 that might possibly be used for returning the result of a
3583 function. ARGUMENTS is the value returned by
3584 __builtin_apply_args. ARGSIZE is the number of bytes of
3585 arguments that must be copied. ??? How should this value be
3586 computed? We'll also need a safe worst case value for varargs
3588 case BUILT_IN_APPLY
:
3589 if (!validate_arglist (arglist
, POINTER_TYPE
,
3590 POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
)
3591 && !validate_arglist (arglist
, REFERENCE_TYPE
,
3592 POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
3600 for (t
= arglist
, i
= 0; t
; t
= TREE_CHAIN (t
), i
++)
3601 ops
[i
] = expand_expr (TREE_VALUE (t
), NULL_RTX
, VOIDmode
, 0);
3603 return expand_builtin_apply (ops
[0], ops
[1], ops
[2]);
3606 /* __builtin_return (RESULT) causes the function to return the
3607 value described by RESULT. RESULT is address of the block of
3608 memory returned by __builtin_apply. */
3609 case BUILT_IN_RETURN
:
3610 if (validate_arglist (arglist
, POINTER_TYPE
, VOID_TYPE
))
3611 expand_builtin_return (expand_expr (TREE_VALUE (arglist
),
3612 NULL_RTX
, VOIDmode
, 0));
3615 case BUILT_IN_SAVEREGS
:
3616 return expand_builtin_saveregs ();
3618 case BUILT_IN_ARGS_INFO
:
3619 return expand_builtin_args_info (exp
);
3621 /* Return the address of the first anonymous stack arg. */
3622 case BUILT_IN_NEXT_ARG
:
3623 return expand_builtin_next_arg (arglist
);
3625 case BUILT_IN_CLASSIFY_TYPE
:
3626 return expand_builtin_classify_type (arglist
);
3628 case BUILT_IN_CONSTANT_P
:
3629 return expand_builtin_constant_p (exp
);
3631 case BUILT_IN_FRAME_ADDRESS
:
3632 case BUILT_IN_RETURN_ADDRESS
:
3633 return expand_builtin_frame_address (exp
);
3635 /* Returns the address of the area where the structure is returned.
3637 case BUILT_IN_AGGREGATE_INCOMING_ADDRESS
:
3639 || ! AGGREGATE_TYPE_P (TREE_TYPE (TREE_TYPE (current_function_decl
)))
3640 || GET_CODE (DECL_RTL (DECL_RESULT (current_function_decl
))) != MEM
)
3643 return XEXP (DECL_RTL (DECL_RESULT (current_function_decl
)), 0);
3645 case BUILT_IN_ALLOCA
:
3646 target
= expand_builtin_alloca (arglist
, target
);
3652 target
= expand_builtin_ffs (arglist
, target
, subtarget
);
3657 case BUILT_IN_STRLEN
:
3658 target
= expand_builtin_strlen (exp
, target
);
3663 case BUILT_IN_STRCPY
:
3664 target
= expand_builtin_strcpy (exp
);
3669 case BUILT_IN_STRNCPY
:
3670 target
= expand_builtin_strncpy (arglist
, target
, mode
);
3675 case BUILT_IN_STRCAT
:
3676 target
= expand_builtin_strcat (arglist
, target
, mode
);
3681 case BUILT_IN_STRNCAT
:
3682 target
= expand_builtin_strncat (arglist
, target
, mode
);
3687 case BUILT_IN_STRSPN
:
3688 target
= expand_builtin_strspn (arglist
, target
, mode
);
3693 case BUILT_IN_STRCSPN
:
3694 target
= expand_builtin_strcspn (arglist
, target
, mode
);
3699 case BUILT_IN_STRSTR
:
3700 target
= expand_builtin_strstr (arglist
, target
, mode
);
3705 case BUILT_IN_STRPBRK
:
3706 target
= expand_builtin_strpbrk (arglist
, target
, mode
);
3711 case BUILT_IN_INDEX
:
3712 case BUILT_IN_STRCHR
:
3713 target
= expand_builtin_strchr (arglist
, target
, mode
);
3718 case BUILT_IN_RINDEX
:
3719 case BUILT_IN_STRRCHR
:
3720 target
= expand_builtin_strrchr (arglist
, target
, mode
);
3725 case BUILT_IN_MEMCPY
:
3726 target
= expand_builtin_memcpy (arglist
);
3731 case BUILT_IN_MEMSET
:
3732 target
= expand_builtin_memset (exp
);
3737 case BUILT_IN_BZERO
:
3738 target
= expand_builtin_bzero (exp
);
3743 case BUILT_IN_STRCMP
:
3744 target
= expand_builtin_strcmp (exp
, target
, mode
);
3749 case BUILT_IN_STRNCMP
:
3750 target
= expand_builtin_strncmp (exp
, target
, mode
);
3755 /* These comparison functions need an instruction that returns an actual
3756 index. An ordinary compare that just sets the condition codes
3758 #ifdef HAVE_cmpstrsi
3760 case BUILT_IN_MEMCMP
:
3761 target
= expand_builtin_memcmp (exp
, arglist
, target
);
3767 case BUILT_IN_MEMCMP
:
3771 case BUILT_IN_SETJMP
:
3772 target
= expand_builtin_setjmp (arglist
, target
);
3777 /* __builtin_longjmp is passed a pointer to an array of five words.
3778 It's similar to the C library longjmp function but works with
3779 __builtin_setjmp above. */
3780 case BUILT_IN_LONGJMP
:
3781 if (!validate_arglist (arglist
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
3785 rtx buf_addr
= expand_expr (TREE_VALUE (arglist
), subtarget
,
3787 rtx value
= expand_expr (TREE_VALUE (TREE_CHAIN (arglist
)),
3788 NULL_RTX
, VOIDmode
, 0);
3790 if (value
!= const1_rtx
)
3792 error ("__builtin_longjmp second argument must be 1");
3796 expand_builtin_longjmp (buf_addr
, value
);
3803 emit_insn (gen_trap ());
3806 error ("__builtin_trap not supported by this target");
3810 case BUILT_IN_PUTCHAR
:
3812 case BUILT_IN_FPUTC
:
3813 case BUILT_IN_FWRITE
:
3815 case BUILT_IN_FPUTS
:
3816 target
= expand_builtin_fputs (arglist
, ignore
);
3821 /* Various hooks for the DWARF 2 __throw routine. */
3822 case BUILT_IN_UNWIND_INIT
:
3823 expand_builtin_unwind_init ();
3825 case BUILT_IN_DWARF_CFA
:
3826 return virtual_cfa_rtx
;
3827 #ifdef DWARF2_UNWIND_INFO
3828 case BUILT_IN_DWARF_FP_REGNUM
:
3829 return expand_builtin_dwarf_fp_regnum ();
3830 case BUILT_IN_INIT_DWARF_REG_SIZES
:
3831 expand_builtin_init_dwarf_reg_sizes (TREE_VALUE (arglist
));
3834 case BUILT_IN_FROB_RETURN_ADDR
:
3835 return expand_builtin_frob_return_addr (TREE_VALUE (arglist
));
3836 case BUILT_IN_EXTRACT_RETURN_ADDR
:
3837 return expand_builtin_extract_return_addr (TREE_VALUE (arglist
));
3838 case BUILT_IN_EH_RETURN
:
3839 expand_builtin_eh_return (TREE_VALUE (arglist
),
3840 TREE_VALUE (TREE_CHAIN (arglist
)));
3842 #ifdef EH_RETURN_DATA_REGNO
3843 case BUILT_IN_EH_RETURN_DATA_REGNO
:
3844 return expand_builtin_eh_return_data_regno (arglist
);
3846 case BUILT_IN_VARARGS_START
:
3847 return expand_builtin_va_start (0, arglist
);
3848 case BUILT_IN_STDARG_START
:
3849 return expand_builtin_va_start (1, arglist
);
3850 case BUILT_IN_VA_END
:
3851 return expand_builtin_va_end (arglist
);
3852 case BUILT_IN_VA_COPY
:
3853 return expand_builtin_va_copy (arglist
);
3854 case BUILT_IN_EXPECT
:
3855 return expand_builtin_expect (arglist
, target
);
3856 case BUILT_IN_PREFETCH
:
3857 expand_builtin_prefetch (arglist
);
3861 default: /* just do library call, if unknown builtin */
3862 error ("built-in function `%s' not currently supported",
3863 IDENTIFIER_POINTER (DECL_NAME (fndecl
)));
3866 /* The switch statement above can drop through to cause the function
3867 to be called normally. */
3868 return expand_call (exp
, target
, ignore
);
3871 /* Fold a call to __builtin_constant_p, if we know it will evaluate to a
3872 constant. ARGLIST is the argument list of the call. */
3875 fold_builtin_constant_p (arglist
)
3881 arglist
= TREE_VALUE (arglist
);
3883 /* We return 1 for a numeric type that's known to be a constant
3884 value at compile-time or for an aggregate type that's a
3885 literal constant. */
3886 STRIP_NOPS (arglist
);
3888 /* If we know this is a constant, emit the constant of one. */
3889 if (TREE_CODE_CLASS (TREE_CODE (arglist
)) == 'c'
3890 || (TREE_CODE (arglist
) == CONSTRUCTOR
3891 && TREE_CONSTANT (arglist
))
3892 || (TREE_CODE (arglist
) == ADDR_EXPR
3893 && TREE_CODE (TREE_OPERAND (arglist
, 0)) == STRING_CST
))
3894 return integer_one_node
;
3896 /* If we aren't going to be running CSE or this expression
3897 has side effects, show we don't know it to be a constant.
3898 Likewise if it's a pointer or aggregate type since in those
3899 case we only want literals, since those are only optimized
3900 when generating RTL, not later.
3901 And finally, if we are compiling an initializer, not code, we
3902 need to return a definite result now; there's not going to be any
3903 more optimization done. */
3904 if (TREE_SIDE_EFFECTS (arglist
) || cse_not_expected
3905 || AGGREGATE_TYPE_P (TREE_TYPE (arglist
))
3906 || POINTER_TYPE_P (TREE_TYPE (arglist
))
3908 return integer_zero_node
;
3913 /* Fold a call to __builtin_classify_type. */
3916 fold_builtin_classify_type (arglist
)
3920 return build_int_2 (no_type_class
, 0);
3922 return build_int_2 (type_to_class (TREE_TYPE (TREE_VALUE (arglist
))), 0);
3925 /* Used by constant folding to eliminate some builtin calls early. EXP is
3926 the CALL_EXPR of a call to a builtin function. */
3932 tree fndecl
= TREE_OPERAND (TREE_OPERAND (exp
, 0), 0);
3933 tree arglist
= TREE_OPERAND (exp
, 1);
3934 enum built_in_function fcode
= DECL_FUNCTION_CODE (fndecl
);
3936 if (DECL_BUILT_IN_CLASS (fndecl
) == BUILT_IN_MD
)
3941 case BUILT_IN_CONSTANT_P
:
3942 return fold_builtin_constant_p (arglist
);
3944 case BUILT_IN_CLASSIFY_TYPE
:
3945 return fold_builtin_classify_type (arglist
);
3947 case BUILT_IN_STRLEN
:
3948 if (validate_arglist (arglist
, POINTER_TYPE
, VOID_TYPE
))
3950 tree len
= c_strlen (TREE_VALUE (arglist
));
3964 build_function_call_expr (fn
, arglist
)
3969 call_expr
= build1 (ADDR_EXPR
, build_pointer_type (TREE_TYPE (fn
)), fn
);
3970 call_expr
= build (CALL_EXPR
, TREE_TYPE (TREE_TYPE (fn
)),
3971 call_expr
, arglist
);
3972 TREE_SIDE_EFFECTS (call_expr
) = 1;
3973 return fold (call_expr
);
3976 /* This function validates the types of a function call argument list
3977 represented as a tree chain of parameters against a specified list
3978 of tree_codes. If the last specifier is a 0, that represents an
3979 ellipses, otherwise the last specifier must be a VOID_TYPE. */
3982 validate_arglist
VPARAMS ((tree arglist
, ...))
3984 enum tree_code code
;
3987 VA_OPEN (ap
, arglist
);
3988 VA_FIXEDARG (ap
, tree
, arglist
);
3991 code
= va_arg (ap
, enum tree_code
);
3995 /* This signifies an ellipses, any further arguments are all ok. */
3999 /* This signifies an endlink, if no arguments remain, return
4000 true, otherwise return false. */
4004 /* If no parameters remain or the parameter's code does not
4005 match the specified code, return false. Otherwise continue
4006 checking any remaining arguments. */
4007 if (arglist
== 0 || code
!= TREE_CODE (TREE_TYPE (TREE_VALUE (arglist
))))
4011 arglist
= TREE_CHAIN (arglist
);
4014 /* We need gotos here since we can only have one VA_CLOSE in a
4022 /* Default version of target-specific builtin setup that does nothing. */
4025 default_init_builtins ()
4029 /* Default target-specific builtin expander that does nothing. */
4032 default_expand_builtin (exp
, target
, subtarget
, mode
, ignore
)
4033 tree exp ATTRIBUTE_UNUSED
;
4034 rtx target ATTRIBUTE_UNUSED
;
4035 rtx subtarget ATTRIBUTE_UNUSED
;
4036 enum machine_mode mode ATTRIBUTE_UNUSED
;
4037 int ignore ATTRIBUTE_UNUSED
;