1 /* Expand builtin functions.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
30 #include "hard-reg-set.h"
33 #include "insn-config.h"
39 #include "typeclass.h"
44 #include "langhooks.h"
46 #define CALLED_AS_BUILT_IN(NODE) \
47 (!strncmp (IDENTIFIER_POINTER (DECL_NAME (NODE)), "__builtin_", 10))
49 /* Register mappings for target machines without register windows. */
50 #ifndef INCOMING_REGNO
51 #define INCOMING_REGNO(OUT) (OUT)
53 #ifndef OUTGOING_REGNO
54 #define OUTGOING_REGNO(IN) (IN)
57 #ifndef PAD_VARARGS_DOWN
58 #define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
61 /* Define the names of the builtin function types and codes. */
62 const char *const built_in_class_names
[4]
63 = {"NOT_BUILT_IN", "BUILT_IN_FRONTEND", "BUILT_IN_MD", "BUILT_IN_NORMAL"};
65 #define DEF_BUILTIN(X, N, C, T, LT, B, F, NA, AT) STRINGX(X),
66 const char *const built_in_names
[(int) END_BUILTINS
] =
68 #include "builtins.def"
72 /* Setup an array of _DECL trees, make sure each element is
73 initialized to NULL_TREE. */
74 tree built_in_decls
[(int) END_BUILTINS
];
76 static int get_pointer_alignment
PARAMS ((tree
, unsigned int));
77 static tree c_strlen
PARAMS ((tree
));
78 static const char *c_getstr
PARAMS ((tree
));
79 static rtx c_readstr
PARAMS ((const char *,
81 static int target_char_cast
PARAMS ((tree
, char *));
82 static rtx get_memory_rtx
PARAMS ((tree
));
83 static int apply_args_size
PARAMS ((void));
84 static int apply_result_size
PARAMS ((void));
85 #if defined (HAVE_untyped_call) || defined (HAVE_untyped_return)
86 static rtx result_vector
PARAMS ((int, rtx
));
88 static rtx expand_builtin_setjmp
PARAMS ((tree
, rtx
));
89 static void expand_builtin_prefetch
PARAMS ((tree
));
90 static rtx expand_builtin_apply_args
PARAMS ((void));
91 static rtx expand_builtin_apply_args_1
PARAMS ((void));
92 static rtx expand_builtin_apply
PARAMS ((rtx
, rtx
, rtx
));
93 static void expand_builtin_return
PARAMS ((rtx
));
94 static enum type_class type_to_class
PARAMS ((tree
));
95 static rtx expand_builtin_classify_type
PARAMS ((tree
));
96 static rtx expand_builtin_mathfn
PARAMS ((tree
, rtx
, rtx
));
97 static rtx expand_builtin_constant_p
PARAMS ((tree
));
98 static rtx expand_builtin_args_info
PARAMS ((tree
));
99 static rtx expand_builtin_next_arg
PARAMS ((tree
));
100 static rtx expand_builtin_va_start
PARAMS ((tree
));
101 static rtx expand_builtin_va_end
PARAMS ((tree
));
102 static rtx expand_builtin_va_copy
PARAMS ((tree
));
103 static rtx expand_builtin_memcmp
PARAMS ((tree
, tree
, rtx
,
105 static rtx expand_builtin_strcmp
PARAMS ((tree
, rtx
,
107 static rtx expand_builtin_strncmp
PARAMS ((tree
, rtx
,
109 static rtx builtin_memcpy_read_str
PARAMS ((PTR
, HOST_WIDE_INT
,
111 static rtx expand_builtin_strcat
PARAMS ((tree
, rtx
,
113 static rtx expand_builtin_strncat
PARAMS ((tree
, rtx
,
115 static rtx expand_builtin_strspn
PARAMS ((tree
, rtx
,
117 static rtx expand_builtin_strcspn
PARAMS ((tree
, rtx
,
119 static rtx expand_builtin_memcpy
PARAMS ((tree
, rtx
,
121 static rtx expand_builtin_strcpy
PARAMS ((tree
, rtx
,
123 static rtx builtin_strncpy_read_str
PARAMS ((PTR
, HOST_WIDE_INT
,
125 static rtx expand_builtin_strncpy
PARAMS ((tree
, rtx
,
127 static rtx builtin_memset_read_str
PARAMS ((PTR
, HOST_WIDE_INT
,
129 static rtx builtin_memset_gen_str
PARAMS ((PTR
, HOST_WIDE_INT
,
131 static rtx expand_builtin_memset
PARAMS ((tree
, rtx
,
133 static rtx expand_builtin_bzero
PARAMS ((tree
));
134 static rtx expand_builtin_strlen
PARAMS ((tree
, rtx
));
135 static rtx expand_builtin_strstr
PARAMS ((tree
, rtx
,
137 static rtx expand_builtin_strpbrk
PARAMS ((tree
, rtx
,
139 static rtx expand_builtin_strchr
PARAMS ((tree
, rtx
,
141 static rtx expand_builtin_strrchr
PARAMS ((tree
, rtx
,
143 static rtx expand_builtin_alloca
PARAMS ((tree
, rtx
));
144 static rtx expand_builtin_ffs
PARAMS ((tree
, rtx
, rtx
));
145 static rtx expand_builtin_frame_address
PARAMS ((tree
));
146 static rtx expand_builtin_fputs
PARAMS ((tree
, int, int));
147 static tree stabilize_va_list
PARAMS ((tree
, int));
148 static rtx expand_builtin_expect
PARAMS ((tree
, rtx
));
149 static tree fold_builtin_constant_p
PARAMS ((tree
));
150 static tree fold_builtin_classify_type
PARAMS ((tree
));
151 static tree build_function_call_expr
PARAMS ((tree
, tree
));
152 static int validate_arglist
PARAMS ((tree
, ...));
154 /* Return the alignment in bits of EXP, a pointer valued expression.
155 But don't return more than MAX_ALIGN no matter what.
156 The alignment returned is, by default, the alignment of the thing that
157 EXP points to. If it is not a POINTER_TYPE, 0 is returned.
159 Otherwise, look at the expression to see if we can do better, i.e., if the
160 expression is actually pointing at an object whose alignment is tighter. */
163 get_pointer_alignment (exp
, max_align
)
165 unsigned int max_align
;
167 unsigned int align
, inner
;
169 if (TREE_CODE (TREE_TYPE (exp
)) != POINTER_TYPE
)
172 align
= TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp
)));
173 align
= MIN (align
, max_align
);
177 switch (TREE_CODE (exp
))
181 case NON_LVALUE_EXPR
:
182 exp
= TREE_OPERAND (exp
, 0);
183 if (TREE_CODE (TREE_TYPE (exp
)) != POINTER_TYPE
)
186 inner
= TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp
)));
187 align
= MIN (inner
, max_align
);
191 /* If sum of pointer + int, restrict our maximum alignment to that
192 imposed by the integer. If not, we can't do any better than
194 if (! host_integerp (TREE_OPERAND (exp
, 1), 1))
197 while (((tree_low_cst (TREE_OPERAND (exp
, 1), 1))
198 & (max_align
/ BITS_PER_UNIT
- 1))
202 exp
= TREE_OPERAND (exp
, 0);
206 /* See what we are pointing at and look at its alignment. */
207 exp
= TREE_OPERAND (exp
, 0);
208 if (TREE_CODE (exp
) == FUNCTION_DECL
)
209 align
= FUNCTION_BOUNDARY
;
210 else if (DECL_P (exp
))
211 align
= DECL_ALIGN (exp
);
212 #ifdef CONSTANT_ALIGNMENT
213 else if (TREE_CODE_CLASS (TREE_CODE (exp
)) == 'c')
214 align
= CONSTANT_ALIGNMENT (exp
, align
);
216 return MIN (align
, max_align
);
224 /* Compute the length of a C string. TREE_STRING_LENGTH is not the right
225 way, because it could contain a zero byte in the middle.
226 TREE_STRING_LENGTH is the size of the character array, not the string.
228 The value returned is of type `ssizetype'.
230 Unfortunately, string_constant can't access the values of const char
231 arrays with initializers, so neither can we do so here. */
238 HOST_WIDE_INT offset
;
242 src
= string_constant (src
, &offset_node
);
246 max
= TREE_STRING_LENGTH (src
) - 1;
247 ptr
= TREE_STRING_POINTER (src
);
249 if (offset_node
&& TREE_CODE (offset_node
) != INTEGER_CST
)
251 /* If the string has an internal zero byte (e.g., "foo\0bar"), we can't
252 compute the offset to the following null if we don't know where to
253 start searching for it. */
256 for (i
= 0; i
< max
; i
++)
260 /* We don't know the starting offset, but we do know that the string
261 has no internal zero bytes. We can assume that the offset falls
262 within the bounds of the string; otherwise, the programmer deserves
263 what he gets. Subtract the offset from the length of the string,
264 and return that. This would perhaps not be valid if we were dealing
265 with named arrays in addition to literal string constants. */
267 return size_diffop (size_int (max
), offset_node
);
270 /* We have a known offset into the string. Start searching there for
271 a null character if we can represent it as a single HOST_WIDE_INT. */
272 if (offset_node
== 0)
274 else if (! host_integerp (offset_node
, 0))
277 offset
= tree_low_cst (offset_node
, 0);
279 /* If the offset is known to be out of bounds, warn, and call strlen at
281 if (offset
< 0 || offset
> max
)
283 warning ("offset outside bounds of constant string");
287 /* Use strlen to search for the first zero byte. Since any strings
288 constructed with build_string will have nulls appended, we win even
289 if we get handed something like (char[4])"abcd".
291 Since OFFSET is our starting index into the string, no further
292 calculation is needed. */
293 return ssize_int (strlen (ptr
+ offset
));
296 /* Return a char pointer for a C string if it is a string constant
297 or sum of string constant and integer constant. */
305 src
= string_constant (src
, &offset_node
);
309 if (offset_node
== 0)
310 return TREE_STRING_POINTER (src
);
311 else if (!host_integerp (offset_node
, 1)
312 || compare_tree_int (offset_node
, TREE_STRING_LENGTH (src
) - 1) > 0)
315 return TREE_STRING_POINTER (src
) + tree_low_cst (offset_node
, 1);
318 /* Return a CONST_INT or CONST_DOUBLE corresponding to target reading
319 GET_MODE_BITSIZE (MODE) bits from string constant STR. */
322 c_readstr (str
, mode
)
324 enum machine_mode mode
;
330 if (GET_MODE_CLASS (mode
) != MODE_INT
)
335 for (i
= 0; i
< GET_MODE_SIZE (mode
); i
++)
338 if (WORDS_BIG_ENDIAN
)
339 j
= GET_MODE_SIZE (mode
) - i
- 1;
340 if (BYTES_BIG_ENDIAN
!= WORDS_BIG_ENDIAN
341 && GET_MODE_SIZE (mode
) > UNITS_PER_WORD
)
342 j
= j
+ UNITS_PER_WORD
- 2 * (j
% UNITS_PER_WORD
) - 1;
344 if (j
> 2 * HOST_BITS_PER_WIDE_INT
)
347 ch
= (unsigned char) str
[i
];
348 c
[j
/ HOST_BITS_PER_WIDE_INT
] |= ch
<< (j
% HOST_BITS_PER_WIDE_INT
);
350 return immed_double_const (c
[0], c
[1], mode
);
353 /* Cast a target constant CST to target CHAR and if that value fits into
354 host char type, return zero and put that value into variable pointed by
358 target_char_cast (cst
, p
)
362 unsigned HOST_WIDE_INT val
, hostval
;
364 if (!host_integerp (cst
, 1)
365 || CHAR_TYPE_SIZE
> HOST_BITS_PER_WIDE_INT
)
368 val
= tree_low_cst (cst
, 1);
369 if (CHAR_TYPE_SIZE
< HOST_BITS_PER_WIDE_INT
)
370 val
&= (((unsigned HOST_WIDE_INT
) 1) << CHAR_TYPE_SIZE
) - 1;
373 if (HOST_BITS_PER_CHAR
< HOST_BITS_PER_WIDE_INT
)
374 hostval
&= (((unsigned HOST_WIDE_INT
) 1) << HOST_BITS_PER_CHAR
) - 1;
383 /* Given TEM, a pointer to a stack frame, follow the dynamic chain COUNT
384 times to get the address of either a higher stack frame, or a return
385 address located within it (depending on FNDECL_CODE). */
388 expand_builtin_return_addr (fndecl_code
, count
, tem
)
389 enum built_in_function fndecl_code
;
395 /* Some machines need special handling before we can access
396 arbitrary frames. For example, on the sparc, we must first flush
397 all register windows to the stack. */
398 #ifdef SETUP_FRAME_ADDRESSES
400 SETUP_FRAME_ADDRESSES ();
403 /* On the sparc, the return address is not in the frame, it is in a
404 register. There is no way to access it off of the current frame
405 pointer, but it can be accessed off the previous frame pointer by
406 reading the value from the register window save area. */
407 #ifdef RETURN_ADDR_IN_PREVIOUS_FRAME
408 if (fndecl_code
== BUILT_IN_RETURN_ADDRESS
)
412 /* Scan back COUNT frames to the specified frame. */
413 for (i
= 0; i
< count
; i
++)
415 /* Assume the dynamic chain pointer is in the word that the
416 frame address points to, unless otherwise specified. */
417 #ifdef DYNAMIC_CHAIN_ADDRESS
418 tem
= DYNAMIC_CHAIN_ADDRESS (tem
);
420 tem
= memory_address (Pmode
, tem
);
421 tem
= gen_rtx_MEM (Pmode
, tem
);
422 set_mem_alias_set (tem
, get_frame_alias_set ());
423 tem
= copy_to_reg (tem
);
426 /* For __builtin_frame_address, return what we've got. */
427 if (fndecl_code
== BUILT_IN_FRAME_ADDRESS
)
430 /* For __builtin_return_address, Get the return address from that
432 #ifdef RETURN_ADDR_RTX
433 tem
= RETURN_ADDR_RTX (count
, tem
);
435 tem
= memory_address (Pmode
,
436 plus_constant (tem
, GET_MODE_SIZE (Pmode
)));
437 tem
= gen_rtx_MEM (Pmode
, tem
);
438 set_mem_alias_set (tem
, get_frame_alias_set ());
443 /* Alias set used for setjmp buffer. */
444 static HOST_WIDE_INT setjmp_alias_set
= -1;
446 /* Construct the leading half of a __builtin_setjmp call. Control will
447 return to RECEIVER_LABEL. This is used directly by sjlj exception
451 expand_builtin_setjmp_setup (buf_addr
, receiver_label
)
455 enum machine_mode sa_mode
= STACK_SAVEAREA_MODE (SAVE_NONLOCAL
);
459 if (setjmp_alias_set
== -1)
460 setjmp_alias_set
= new_alias_set ();
462 #ifdef POINTERS_EXTEND_UNSIGNED
463 if (GET_MODE (buf_addr
) != Pmode
)
464 buf_addr
= convert_memory_address (Pmode
, buf_addr
);
467 buf_addr
= force_reg (Pmode
, force_operand (buf_addr
, NULL_RTX
));
471 /* We store the frame pointer and the address of receiver_label in
472 the buffer and use the rest of it for the stack save area, which
473 is machine-dependent. */
475 #ifndef BUILTIN_SETJMP_FRAME_VALUE
476 #define BUILTIN_SETJMP_FRAME_VALUE virtual_stack_vars_rtx
479 mem
= gen_rtx_MEM (Pmode
, buf_addr
);
480 set_mem_alias_set (mem
, setjmp_alias_set
);
481 emit_move_insn (mem
, BUILTIN_SETJMP_FRAME_VALUE
);
483 mem
= gen_rtx_MEM (Pmode
, plus_constant (buf_addr
, GET_MODE_SIZE (Pmode
))),
484 set_mem_alias_set (mem
, setjmp_alias_set
);
486 emit_move_insn (validize_mem (mem
),
487 force_reg (Pmode
, gen_rtx_LABEL_REF (Pmode
, receiver_label
)));
489 stack_save
= gen_rtx_MEM (sa_mode
,
490 plus_constant (buf_addr
,
491 2 * GET_MODE_SIZE (Pmode
)));
492 set_mem_alias_set (stack_save
, setjmp_alias_set
);
493 emit_stack_save (SAVE_NONLOCAL
, &stack_save
, NULL_RTX
);
495 /* If there is further processing to do, do it. */
496 #ifdef HAVE_builtin_setjmp_setup
497 if (HAVE_builtin_setjmp_setup
)
498 emit_insn (gen_builtin_setjmp_setup (buf_addr
));
501 /* Tell optimize_save_area_alloca that extra work is going to
502 need to go on during alloca. */
503 current_function_calls_setjmp
= 1;
505 /* Set this so all the registers get saved in our frame; we need to be
506 able to copy the saved values for any registers from frames we unwind. */
507 current_function_has_nonlocal_label
= 1;
510 /* Construct the trailing part of a __builtin_setjmp call.
511 This is used directly by sjlj exception handling code. */
514 expand_builtin_setjmp_receiver (receiver_label
)
515 rtx receiver_label ATTRIBUTE_UNUSED
;
517 /* Clobber the FP when we get here, so we have to make sure it's
518 marked as used by this function. */
519 emit_insn (gen_rtx_USE (VOIDmode
, hard_frame_pointer_rtx
));
521 /* Mark the static chain as clobbered here so life information
522 doesn't get messed up for it. */
523 emit_insn (gen_rtx_CLOBBER (VOIDmode
, static_chain_rtx
));
525 /* Now put in the code to restore the frame pointer, and argument
526 pointer, if needed. The code below is from expand_end_bindings
527 in stmt.c; see detailed documentation there. */
528 #ifdef HAVE_nonlocal_goto
529 if (! HAVE_nonlocal_goto
)
531 emit_move_insn (virtual_stack_vars_rtx
, hard_frame_pointer_rtx
);
533 #if ARG_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM
534 if (fixed_regs
[ARG_POINTER_REGNUM
])
536 #ifdef ELIMINABLE_REGS
538 static const struct elims
{const int from
, to
;} elim_regs
[] = ELIMINABLE_REGS
;
540 for (i
= 0; i
< ARRAY_SIZE (elim_regs
); i
++)
541 if (elim_regs
[i
].from
== ARG_POINTER_REGNUM
542 && elim_regs
[i
].to
== HARD_FRAME_POINTER_REGNUM
)
545 if (i
== ARRAY_SIZE (elim_regs
))
548 /* Now restore our arg pointer from the address at which it
549 was saved in our stack frame. */
550 emit_move_insn (virtual_incoming_args_rtx
,
551 copy_to_reg (get_arg_pointer_save_area (cfun
)));
556 #ifdef HAVE_builtin_setjmp_receiver
557 if (HAVE_builtin_setjmp_receiver
)
558 emit_insn (gen_builtin_setjmp_receiver (receiver_label
));
561 #ifdef HAVE_nonlocal_goto_receiver
562 if (HAVE_nonlocal_goto_receiver
)
563 emit_insn (gen_nonlocal_goto_receiver ());
568 /* @@@ This is a kludge. Not all machine descriptions define a blockage
569 insn, but we must not allow the code we just generated to be reordered
570 by scheduling. Specifically, the update of the frame pointer must
571 happen immediately, not later. So emit an ASM_INPUT to act as blockage
573 emit_insn (gen_rtx_ASM_INPUT (VOIDmode
, ""));
576 /* __builtin_setjmp is passed a pointer to an array of five words (not
577 all will be used on all machines). It operates similarly to the C
578 library function of the same name, but is more efficient. Much of
579 the code below (and for longjmp) is copied from the handling of
582 NOTE: This is intended for use by GNAT and the exception handling
583 scheme in the compiler and will only work in the method used by
587 expand_builtin_setjmp (arglist
, target
)
591 rtx buf_addr
, next_lab
, cont_lab
;
593 if (!validate_arglist (arglist
, POINTER_TYPE
, VOID_TYPE
))
596 if (target
== 0 || GET_CODE (target
) != REG
597 || REGNO (target
) < FIRST_PSEUDO_REGISTER
)
598 target
= gen_reg_rtx (TYPE_MODE (integer_type_node
));
600 buf_addr
= expand_expr (TREE_VALUE (arglist
), NULL_RTX
, VOIDmode
, 0);
602 next_lab
= gen_label_rtx ();
603 cont_lab
= gen_label_rtx ();
605 expand_builtin_setjmp_setup (buf_addr
, next_lab
);
607 /* Set TARGET to zero and branch to the continue label. */
608 emit_move_insn (target
, const0_rtx
);
609 emit_jump_insn (gen_jump (cont_lab
));
611 emit_label (next_lab
);
613 expand_builtin_setjmp_receiver (next_lab
);
615 /* Set TARGET to one. */
616 emit_move_insn (target
, const1_rtx
);
617 emit_label (cont_lab
);
619 /* Tell flow about the strange goings on. Putting `next_lab' on
620 `nonlocal_goto_handler_labels' to indicates that function
621 calls may traverse the arc back to this label. */
623 current_function_has_nonlocal_label
= 1;
624 nonlocal_goto_handler_labels
625 = gen_rtx_EXPR_LIST (VOIDmode
, next_lab
, nonlocal_goto_handler_labels
);
630 /* __builtin_longjmp is passed a pointer to an array of five words (not
631 all will be used on all machines). It operates similarly to the C
632 library function of the same name, but is more efficient. Much of
633 the code below is copied from the handling of non-local gotos.
635 NOTE: This is intended for use by GNAT and the exception handling
636 scheme in the compiler and will only work in the method used by
640 expand_builtin_longjmp (buf_addr
, value
)
643 rtx fp
, lab
, stack
, insn
, last
;
644 enum machine_mode sa_mode
= STACK_SAVEAREA_MODE (SAVE_NONLOCAL
);
646 if (setjmp_alias_set
== -1)
647 setjmp_alias_set
= new_alias_set ();
649 #ifdef POINTERS_EXTEND_UNSIGNED
650 if (GET_MODE (buf_addr
) != Pmode
)
651 buf_addr
= convert_memory_address (Pmode
, buf_addr
);
654 buf_addr
= force_reg (Pmode
, buf_addr
);
656 /* We used to store value in static_chain_rtx, but that fails if pointers
657 are smaller than integers. We instead require that the user must pass
658 a second argument of 1, because that is what builtin_setjmp will
659 return. This also makes EH slightly more efficient, since we are no
660 longer copying around a value that we don't care about. */
661 if (value
!= const1_rtx
)
664 current_function_calls_longjmp
= 1;
666 last
= get_last_insn ();
667 #ifdef HAVE_builtin_longjmp
668 if (HAVE_builtin_longjmp
)
669 emit_insn (gen_builtin_longjmp (buf_addr
));
673 fp
= gen_rtx_MEM (Pmode
, buf_addr
);
674 lab
= gen_rtx_MEM (Pmode
, plus_constant (buf_addr
,
675 GET_MODE_SIZE (Pmode
)));
677 stack
= gen_rtx_MEM (sa_mode
, plus_constant (buf_addr
,
678 2 * GET_MODE_SIZE (Pmode
)));
679 set_mem_alias_set (fp
, setjmp_alias_set
);
680 set_mem_alias_set (lab
, setjmp_alias_set
);
681 set_mem_alias_set (stack
, setjmp_alias_set
);
683 /* Pick up FP, label, and SP from the block and jump. This code is
684 from expand_goto in stmt.c; see there for detailed comments. */
685 #if HAVE_nonlocal_goto
686 if (HAVE_nonlocal_goto
)
687 /* We have to pass a value to the nonlocal_goto pattern that will
688 get copied into the static_chain pointer, but it does not matter
689 what that value is, because builtin_setjmp does not use it. */
690 emit_insn (gen_nonlocal_goto (value
, lab
, stack
, fp
));
694 lab
= copy_to_reg (lab
);
696 emit_move_insn (hard_frame_pointer_rtx
, fp
);
697 emit_stack_restore (SAVE_NONLOCAL
, stack
, NULL_RTX
);
699 emit_insn (gen_rtx_USE (VOIDmode
, hard_frame_pointer_rtx
));
700 emit_insn (gen_rtx_USE (VOIDmode
, stack_pointer_rtx
));
701 emit_indirect_jump (lab
);
705 /* Search backwards and mark the jump insn as a non-local goto.
706 Note that this precludes the use of __builtin_longjmp to a
707 __builtin_setjmp target in the same function. However, we've
708 already cautioned the user that these functions are for
709 internal exception handling use only. */
710 for (insn
= get_last_insn (); insn
; insn
= PREV_INSN (insn
))
714 if (GET_CODE (insn
) == JUMP_INSN
)
716 REG_NOTES (insn
) = alloc_EXPR_LIST (REG_NON_LOCAL_GOTO
, const0_rtx
,
720 else if (GET_CODE (insn
) == CALL_INSN
)
725 /* Expand a call to __builtin_prefetch. For a target that does not support
726 data prefetch, evaluate the memory address argument in case it has side
730 expand_builtin_prefetch (arglist
)
733 tree arg0
, arg1
, arg2
;
736 if (!validate_arglist (arglist
, POINTER_TYPE
, 0))
739 arg0
= TREE_VALUE (arglist
);
740 /* Arguments 1 and 2 are optional; argument 1 (read/write) defaults to
741 zero (read) and argument 2 (locality) defaults to 3 (high degree of
743 if (TREE_CHAIN (arglist
))
745 arg1
= TREE_VALUE (TREE_CHAIN (arglist
));
746 if (TREE_CHAIN (TREE_CHAIN (arglist
)))
747 arg2
= TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist
)));
749 arg2
= build_int_2 (3, 0);
753 arg1
= integer_zero_node
;
754 arg2
= build_int_2 (3, 0);
757 /* Argument 0 is an address. */
758 op0
= expand_expr (arg0
, NULL_RTX
, Pmode
, EXPAND_NORMAL
);
760 /* Argument 1 (read/write flag) must be a compile-time constant int. */
761 if (TREE_CODE (arg1
) != INTEGER_CST
)
763 error ("second arg to `__builtin_prefetch' must be a constant");
764 arg1
= integer_zero_node
;
766 op1
= expand_expr (arg1
, NULL_RTX
, VOIDmode
, 0);
767 /* Argument 1 must be either zero or one. */
768 if (INTVAL (op1
) != 0 && INTVAL (op1
) != 1)
770 warning ("invalid second arg to __builtin_prefetch; using zero");
774 /* Argument 2 (locality) must be a compile-time constant int. */
775 if (TREE_CODE (arg2
) != INTEGER_CST
)
777 error ("third arg to `__builtin_prefetch' must be a constant");
778 arg2
= integer_zero_node
;
780 op2
= expand_expr (arg2
, NULL_RTX
, VOIDmode
, 0);
781 /* Argument 2 must be 0, 1, 2, or 3. */
782 if (INTVAL (op2
) < 0 || INTVAL (op2
) > 3)
784 warning ("invalid third arg to __builtin_prefetch; using zero");
791 if ((! (*insn_data
[(int)CODE_FOR_prefetch
].operand
[0].predicate
)
793 insn_data
[(int)CODE_FOR_prefetch
].operand
[0].mode
)) ||
794 (GET_MODE(op0
) != Pmode
))
796 #ifdef POINTERS_EXTEND_UNSIGNED
797 if (GET_MODE(op0
) != Pmode
)
798 op0
= convert_memory_address (Pmode
, op0
);
800 op0
= force_reg (Pmode
, op0
);
802 emit_insn (gen_prefetch (op0
, op1
, op2
));
806 op0
= protect_from_queue (op0
, 0);
807 /* Don't do anything with direct references to volatile memory, but
808 generate code to handle other side effects. */
809 if (GET_CODE (op0
) != MEM
&& side_effects_p (op0
))
813 /* Get a MEM rtx for expression EXP which is the address of an operand
814 to be used to be used in a string instruction (cmpstrsi, movstrsi, ..). */
820 rtx addr
= expand_expr (exp
, NULL_RTX
, ptr_mode
, EXPAND_SUM
);
823 #ifdef POINTERS_EXTEND_UNSIGNED
824 if (GET_MODE (addr
) != Pmode
)
825 addr
= convert_memory_address (Pmode
, addr
);
828 mem
= gen_rtx_MEM (BLKmode
, memory_address (BLKmode
, addr
));
830 /* Get an expression we can use to find the attributes to assign to MEM.
831 If it is an ADDR_EXPR, use the operand. Otherwise, dereference it if
832 we can. First remove any nops. */
833 while ((TREE_CODE (exp
) == NOP_EXPR
|| TREE_CODE (exp
) == CONVERT_EXPR
834 || TREE_CODE (exp
) == NON_LVALUE_EXPR
)
835 && POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (exp
, 0))))
836 exp
= TREE_OPERAND (exp
, 0);
838 if (TREE_CODE (exp
) == ADDR_EXPR
)
840 exp
= TREE_OPERAND (exp
, 0);
841 set_mem_attributes (mem
, exp
, 0);
843 else if (POINTER_TYPE_P (TREE_TYPE (exp
)))
845 exp
= build1 (INDIRECT_REF
, TREE_TYPE (TREE_TYPE (exp
)), exp
);
846 /* memcpy, memset and other builtin stringops can alias with anything. */
847 set_mem_alias_set (mem
, 0);
853 /* Built-in functions to perform an untyped call and return. */
855 /* For each register that may be used for calling a function, this
856 gives a mode used to copy the register's value. VOIDmode indicates
857 the register is not used for calling a function. If the machine
858 has register windows, this gives only the outbound registers.
859 INCOMING_REGNO gives the corresponding inbound register. */
860 static enum machine_mode apply_args_mode
[FIRST_PSEUDO_REGISTER
];
862 /* For each register that may be used for returning values, this gives
863 a mode used to copy the register's value. VOIDmode indicates the
864 register is not used for returning values. If the machine has
865 register windows, this gives only the outbound registers.
866 INCOMING_REGNO gives the corresponding inbound register. */
867 static enum machine_mode apply_result_mode
[FIRST_PSEUDO_REGISTER
];
869 /* For each register that may be used for calling a function, this
870 gives the offset of that register into the block returned by
871 __builtin_apply_args. 0 indicates that the register is not
872 used for calling a function. */
873 static int apply_args_reg_offset
[FIRST_PSEUDO_REGISTER
];
875 /* Return the offset of register REGNO into the block returned by
876 __builtin_apply_args. This is not declared static, since it is
877 needed in objc-act.c. */
880 apply_args_register_offset (regno
)
885 /* Arguments are always put in outgoing registers (in the argument
886 block) if such make sense. */
887 #ifdef OUTGOING_REGNO
888 regno
= OUTGOING_REGNO(regno
);
890 return apply_args_reg_offset
[regno
];
893 /* Return the size required for the block returned by __builtin_apply_args,
894 and initialize apply_args_mode. */
899 static int size
= -1;
902 enum machine_mode mode
;
904 /* The values computed by this function never change. */
907 /* The first value is the incoming arg-pointer. */
908 size
= GET_MODE_SIZE (Pmode
);
910 /* The second value is the structure value address unless this is
911 passed as an "invisible" first argument. */
912 if (struct_value_rtx
)
913 size
+= GET_MODE_SIZE (Pmode
);
915 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
916 if (FUNCTION_ARG_REGNO_P (regno
))
918 /* Search for the proper mode for copying this register's
919 value. I'm not sure this is right, but it works so far. */
920 enum machine_mode best_mode
= VOIDmode
;
922 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_INT
);
924 mode
= GET_MODE_WIDER_MODE (mode
))
925 if (HARD_REGNO_MODE_OK (regno
, mode
)
926 && HARD_REGNO_NREGS (regno
, mode
) == 1)
929 if (best_mode
== VOIDmode
)
930 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_FLOAT
);
932 mode
= GET_MODE_WIDER_MODE (mode
))
933 if (HARD_REGNO_MODE_OK (regno
, mode
)
934 && have_insn_for (SET
, mode
))
937 if (best_mode
== VOIDmode
)
938 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_VECTOR_FLOAT
);
940 mode
= GET_MODE_WIDER_MODE (mode
))
941 if (HARD_REGNO_MODE_OK (regno
, mode
)
942 && have_insn_for (SET
, mode
))
945 if (best_mode
== VOIDmode
)
946 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_VECTOR_INT
);
948 mode
= GET_MODE_WIDER_MODE (mode
))
949 if (HARD_REGNO_MODE_OK (regno
, mode
)
950 && have_insn_for (SET
, mode
))
954 if (mode
== VOIDmode
)
957 align
= GET_MODE_ALIGNMENT (mode
) / BITS_PER_UNIT
;
958 if (size
% align
!= 0)
959 size
= CEIL (size
, align
) * align
;
960 apply_args_reg_offset
[regno
] = size
;
961 size
+= GET_MODE_SIZE (mode
);
962 apply_args_mode
[regno
] = mode
;
966 apply_args_mode
[regno
] = VOIDmode
;
967 apply_args_reg_offset
[regno
] = 0;
973 /* Return the size required for the block returned by __builtin_apply,
974 and initialize apply_result_mode. */
979 static int size
= -1;
981 enum machine_mode mode
;
983 /* The values computed by this function never change. */
988 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
989 if (FUNCTION_VALUE_REGNO_P (regno
))
991 /* Search for the proper mode for copying this register's
992 value. I'm not sure this is right, but it works so far. */
993 enum machine_mode best_mode
= VOIDmode
;
995 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_INT
);
997 mode
= GET_MODE_WIDER_MODE (mode
))
998 if (HARD_REGNO_MODE_OK (regno
, mode
))
1001 if (best_mode
== VOIDmode
)
1002 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_FLOAT
);
1004 mode
= GET_MODE_WIDER_MODE (mode
))
1005 if (HARD_REGNO_MODE_OK (regno
, mode
)
1006 && have_insn_for (SET
, mode
))
1009 if (best_mode
== VOIDmode
)
1010 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_VECTOR_FLOAT
);
1012 mode
= GET_MODE_WIDER_MODE (mode
))
1013 if (HARD_REGNO_MODE_OK (regno
, mode
)
1014 && have_insn_for (SET
, mode
))
1017 if (best_mode
== VOIDmode
)
1018 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_VECTOR_INT
);
1020 mode
= GET_MODE_WIDER_MODE (mode
))
1021 if (HARD_REGNO_MODE_OK (regno
, mode
)
1022 && have_insn_for (SET
, mode
))
1026 if (mode
== VOIDmode
)
1029 align
= GET_MODE_ALIGNMENT (mode
) / BITS_PER_UNIT
;
1030 if (size
% align
!= 0)
1031 size
= CEIL (size
, align
) * align
;
1032 size
+= GET_MODE_SIZE (mode
);
1033 apply_result_mode
[regno
] = mode
;
1036 apply_result_mode
[regno
] = VOIDmode
;
1038 /* Allow targets that use untyped_call and untyped_return to override
1039 the size so that machine-specific information can be stored here. */
1040 #ifdef APPLY_RESULT_SIZE
1041 size
= APPLY_RESULT_SIZE
;
1047 #if defined (HAVE_untyped_call) || defined (HAVE_untyped_return)
1048 /* Create a vector describing the result block RESULT. If SAVEP is true,
1049 the result block is used to save the values; otherwise it is used to
1050 restore the values. */
1053 result_vector (savep
, result
)
1057 int regno
, size
, align
, nelts
;
1058 enum machine_mode mode
;
1060 rtx
*savevec
= (rtx
*) alloca (FIRST_PSEUDO_REGISTER
* sizeof (rtx
));
1063 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
1064 if ((mode
= apply_result_mode
[regno
]) != VOIDmode
)
1066 align
= GET_MODE_ALIGNMENT (mode
) / BITS_PER_UNIT
;
1067 if (size
% align
!= 0)
1068 size
= CEIL (size
, align
) * align
;
1069 reg
= gen_rtx_REG (mode
, savep
? regno
: INCOMING_REGNO (regno
));
1070 mem
= adjust_address (result
, mode
, size
);
1071 savevec
[nelts
++] = (savep
1072 ? gen_rtx_SET (VOIDmode
, mem
, reg
)
1073 : gen_rtx_SET (VOIDmode
, reg
, mem
));
1074 size
+= GET_MODE_SIZE (mode
);
1076 return gen_rtx_PARALLEL (VOIDmode
, gen_rtvec_v (nelts
, savevec
));
1078 #endif /* HAVE_untyped_call or HAVE_untyped_return */
1080 /* Save the state required to perform an untyped call with the same
1081 arguments as were passed to the current function. */
1084 expand_builtin_apply_args_1 ()
1087 int size
, align
, regno
;
1088 enum machine_mode mode
;
1090 /* Create a block where the arg-pointer, structure value address,
1091 and argument registers can be saved. */
1092 registers
= assign_stack_local (BLKmode
, apply_args_size (), -1);
1094 /* Walk past the arg-pointer and structure value address. */
1095 size
= GET_MODE_SIZE (Pmode
);
1096 if (struct_value_rtx
)
1097 size
+= GET_MODE_SIZE (Pmode
);
1099 /* Save each register used in calling a function to the block. */
1100 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
1101 if ((mode
= apply_args_mode
[regno
]) != VOIDmode
)
1105 align
= GET_MODE_ALIGNMENT (mode
) / BITS_PER_UNIT
;
1106 if (size
% align
!= 0)
1107 size
= CEIL (size
, align
) * align
;
1109 tem
= gen_rtx_REG (mode
, INCOMING_REGNO (regno
));
1111 emit_move_insn (adjust_address (registers
, mode
, size
), tem
);
1112 size
+= GET_MODE_SIZE (mode
);
1115 /* Save the arg pointer to the block. */
1116 emit_move_insn (adjust_address (registers
, Pmode
, 0),
1117 copy_to_reg (virtual_incoming_args_rtx
));
1118 size
= GET_MODE_SIZE (Pmode
);
1120 /* Save the structure value address unless this is passed as an
1121 "invisible" first argument. */
1122 if (struct_value_incoming_rtx
)
1124 emit_move_insn (adjust_address (registers
, Pmode
, size
),
1125 copy_to_reg (struct_value_incoming_rtx
));
1126 size
+= GET_MODE_SIZE (Pmode
);
1129 /* Return the address of the block. */
1130 return copy_addr_to_reg (XEXP (registers
, 0));
1133 /* __builtin_apply_args returns block of memory allocated on
1134 the stack into which is stored the arg pointer, structure
1135 value address, static chain, and all the registers that might
1136 possibly be used in performing a function call. The code is
1137 moved to the start of the function so the incoming values are
1141 expand_builtin_apply_args ()
1143 /* Don't do __builtin_apply_args more than once in a function.
1144 Save the result of the first call and reuse it. */
1145 if (apply_args_value
!= 0)
1146 return apply_args_value
;
1148 /* When this function is called, it means that registers must be
1149 saved on entry to this function. So we migrate the
1150 call to the first insn of this function. */
1155 temp
= expand_builtin_apply_args_1 ();
1159 apply_args_value
= temp
;
1161 /* Put the insns after the NOTE that starts the function.
1162 If this is inside a start_sequence, make the outer-level insn
1163 chain current, so the code is placed at the start of the
1165 push_topmost_sequence ();
1166 emit_insn_before (seq
, NEXT_INSN (get_insns ()));
1167 pop_topmost_sequence ();
1172 /* Perform an untyped call and save the state required to perform an
1173 untyped return of whatever value was returned by the given function. */
1176 expand_builtin_apply (function
, arguments
, argsize
)
1177 rtx function
, arguments
, argsize
;
1179 int size
, align
, regno
;
1180 enum machine_mode mode
;
1181 rtx incoming_args
, result
, reg
, dest
, src
, call_insn
;
1182 rtx old_stack_level
= 0;
1183 rtx call_fusage
= 0;
1185 #ifdef POINTERS_EXTEND_UNSIGNED
1186 if (GET_MODE (arguments
) != Pmode
)
1187 arguments
= convert_memory_address (Pmode
, arguments
);
1190 /* Create a block where the return registers can be saved. */
1191 result
= assign_stack_local (BLKmode
, apply_result_size (), -1);
1193 /* Fetch the arg pointer from the ARGUMENTS block. */
1194 incoming_args
= gen_reg_rtx (Pmode
);
1195 emit_move_insn (incoming_args
, gen_rtx_MEM (Pmode
, arguments
));
1196 #ifndef STACK_GROWS_DOWNWARD
1197 incoming_args
= expand_simple_binop (Pmode
, MINUS
, incoming_args
, argsize
,
1198 incoming_args
, 0, OPTAB_LIB_WIDEN
);
1201 /* Perform postincrements before actually calling the function. */
1204 /* Push a new argument block and copy the arguments. Do not allow
1205 the (potential) memcpy call below to interfere with our stack
1207 do_pending_stack_adjust ();
1210 /* Save the stack with nonlocal if available */
1211 #ifdef HAVE_save_stack_nonlocal
1212 if (HAVE_save_stack_nonlocal
)
1213 emit_stack_save (SAVE_NONLOCAL
, &old_stack_level
, NULL_RTX
);
1216 emit_stack_save (SAVE_BLOCK
, &old_stack_level
, NULL_RTX
);
1218 /* Push a block of memory onto the stack to store the memory arguments.
1219 Save the address in a register, and copy the memory arguments. ??? I
1220 haven't figured out how the calling convention macros effect this,
1221 but it's likely that the source and/or destination addresses in
1222 the block copy will need updating in machine specific ways. */
1223 dest
= allocate_dynamic_stack_space (argsize
, 0, BITS_PER_UNIT
);
1224 dest
= gen_rtx_MEM (BLKmode
, dest
);
1225 set_mem_align (dest
, PARM_BOUNDARY
);
1226 src
= gen_rtx_MEM (BLKmode
, incoming_args
);
1227 set_mem_align (src
, PARM_BOUNDARY
);
1228 emit_block_move (dest
, src
, argsize
);
1230 /* Refer to the argument block. */
1232 arguments
= gen_rtx_MEM (BLKmode
, arguments
);
1233 set_mem_align (arguments
, PARM_BOUNDARY
);
1235 /* Walk past the arg-pointer and structure value address. */
1236 size
= GET_MODE_SIZE (Pmode
);
1237 if (struct_value_rtx
)
1238 size
+= GET_MODE_SIZE (Pmode
);
1240 /* Restore each of the registers previously saved. Make USE insns
1241 for each of these registers for use in making the call. */
1242 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
1243 if ((mode
= apply_args_mode
[regno
]) != VOIDmode
)
1245 align
= GET_MODE_ALIGNMENT (mode
) / BITS_PER_UNIT
;
1246 if (size
% align
!= 0)
1247 size
= CEIL (size
, align
) * align
;
1248 reg
= gen_rtx_REG (mode
, regno
);
1249 emit_move_insn (reg
, adjust_address (arguments
, mode
, size
));
1250 use_reg (&call_fusage
, reg
);
1251 size
+= GET_MODE_SIZE (mode
);
1254 /* Restore the structure value address unless this is passed as an
1255 "invisible" first argument. */
1256 size
= GET_MODE_SIZE (Pmode
);
1257 if (struct_value_rtx
)
1259 rtx value
= gen_reg_rtx (Pmode
);
1260 emit_move_insn (value
, adjust_address (arguments
, Pmode
, size
));
1261 emit_move_insn (struct_value_rtx
, value
);
1262 if (GET_CODE (struct_value_rtx
) == REG
)
1263 use_reg (&call_fusage
, struct_value_rtx
);
1264 size
+= GET_MODE_SIZE (Pmode
);
1267 /* All arguments and registers used for the call are set up by now! */
1268 function
= prepare_call_address (function
, NULL_TREE
, &call_fusage
, 0, 0);
1270 /* Ensure address is valid. SYMBOL_REF is already valid, so no need,
1271 and we don't want to load it into a register as an optimization,
1272 because prepare_call_address already did it if it should be done. */
1273 if (GET_CODE (function
) != SYMBOL_REF
)
1274 function
= memory_address (FUNCTION_MODE
, function
);
1276 /* Generate the actual call instruction and save the return value. */
1277 #ifdef HAVE_untyped_call
1278 if (HAVE_untyped_call
)
1279 emit_call_insn (gen_untyped_call (gen_rtx_MEM (FUNCTION_MODE
, function
),
1280 result
, result_vector (1, result
)));
1283 #ifdef HAVE_call_value
1284 if (HAVE_call_value
)
1288 /* Locate the unique return register. It is not possible to
1289 express a call that sets more than one return register using
1290 call_value; use untyped_call for that. In fact, untyped_call
1291 only needs to save the return registers in the given block. */
1292 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
1293 if ((mode
= apply_result_mode
[regno
]) != VOIDmode
)
1296 abort (); /* HAVE_untyped_call required. */
1297 valreg
= gen_rtx_REG (mode
, regno
);
1300 emit_call_insn (GEN_CALL_VALUE (valreg
,
1301 gen_rtx_MEM (FUNCTION_MODE
, function
),
1302 const0_rtx
, NULL_RTX
, const0_rtx
));
1304 emit_move_insn (adjust_address (result
, GET_MODE (valreg
), 0), valreg
);
1310 /* Find the CALL insn we just emitted. */
1311 for (call_insn
= get_last_insn ();
1312 call_insn
&& GET_CODE (call_insn
) != CALL_INSN
;
1313 call_insn
= PREV_INSN (call_insn
))
1319 /* Put the register usage information on the CALL. If there is already
1320 some usage information, put ours at the end. */
1321 if (CALL_INSN_FUNCTION_USAGE (call_insn
))
1325 for (link
= CALL_INSN_FUNCTION_USAGE (call_insn
); XEXP (link
, 1) != 0;
1326 link
= XEXP (link
, 1))
1329 XEXP (link
, 1) = call_fusage
;
1332 CALL_INSN_FUNCTION_USAGE (call_insn
) = call_fusage
;
1334 /* Restore the stack. */
1335 #ifdef HAVE_save_stack_nonlocal
1336 if (HAVE_save_stack_nonlocal
)
1337 emit_stack_restore (SAVE_NONLOCAL
, old_stack_level
, NULL_RTX
);
1340 emit_stack_restore (SAVE_BLOCK
, old_stack_level
, NULL_RTX
);
1344 /* Return the address of the result block. */
1345 return copy_addr_to_reg (XEXP (result
, 0));
1348 /* Perform an untyped return. */
1351 expand_builtin_return (result
)
1354 int size
, align
, regno
;
1355 enum machine_mode mode
;
1357 rtx call_fusage
= 0;
1359 #ifdef POINTERS_EXTEND_UNSIGNED
1360 if (GET_MODE (result
) != Pmode
)
1361 result
= convert_memory_address (Pmode
, result
);
1364 apply_result_size ();
1365 result
= gen_rtx_MEM (BLKmode
, result
);
1367 #ifdef HAVE_untyped_return
1368 if (HAVE_untyped_return
)
1370 emit_jump_insn (gen_untyped_return (result
, result_vector (0, result
)));
1376 /* Restore the return value and note that each value is used. */
1378 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
1379 if ((mode
= apply_result_mode
[regno
]) != VOIDmode
)
1381 align
= GET_MODE_ALIGNMENT (mode
) / BITS_PER_UNIT
;
1382 if (size
% align
!= 0)
1383 size
= CEIL (size
, align
) * align
;
1384 reg
= gen_rtx_REG (mode
, INCOMING_REGNO (regno
));
1385 emit_move_insn (reg
, adjust_address (result
, mode
, size
));
1387 push_to_sequence (call_fusage
);
1388 emit_insn (gen_rtx_USE (VOIDmode
, reg
));
1389 call_fusage
= get_insns ();
1391 size
+= GET_MODE_SIZE (mode
);
1394 /* Put the USE insns before the return. */
1395 emit_insn (call_fusage
);
1397 /* Return whatever values was restored by jumping directly to the end
1399 expand_null_return ();
1402 /* Used by expand_builtin_classify_type and fold_builtin_classify_type. */
1404 static enum type_class
1405 type_to_class (type
)
1408 switch (TREE_CODE (type
))
1410 case VOID_TYPE
: return void_type_class
;
1411 case INTEGER_TYPE
: return integer_type_class
;
1412 case CHAR_TYPE
: return char_type_class
;
1413 case ENUMERAL_TYPE
: return enumeral_type_class
;
1414 case BOOLEAN_TYPE
: return boolean_type_class
;
1415 case POINTER_TYPE
: return pointer_type_class
;
1416 case REFERENCE_TYPE
: return reference_type_class
;
1417 case OFFSET_TYPE
: return offset_type_class
;
1418 case REAL_TYPE
: return real_type_class
;
1419 case COMPLEX_TYPE
: return complex_type_class
;
1420 case FUNCTION_TYPE
: return function_type_class
;
1421 case METHOD_TYPE
: return method_type_class
;
1422 case RECORD_TYPE
: return record_type_class
;
1424 case QUAL_UNION_TYPE
: return union_type_class
;
1425 case ARRAY_TYPE
: return (TYPE_STRING_FLAG (type
)
1426 ? string_type_class
: array_type_class
);
1427 case SET_TYPE
: return set_type_class
;
1428 case FILE_TYPE
: return file_type_class
;
1429 case LANG_TYPE
: return lang_type_class
;
1430 default: return no_type_class
;
1434 /* Expand a call to __builtin_classify_type with arguments found in
1438 expand_builtin_classify_type (arglist
)
1442 return GEN_INT (type_to_class (TREE_TYPE (TREE_VALUE (arglist
))));
1443 return GEN_INT (no_type_class
);
1446 /* Expand expression EXP, which is a call to __builtin_constant_p. */
1449 expand_builtin_constant_p (exp
)
1452 tree arglist
= TREE_OPERAND (exp
, 1);
1453 enum machine_mode value_mode
= TYPE_MODE (TREE_TYPE (exp
));
1458 arglist
= TREE_VALUE (arglist
);
1460 /* We have taken care of the easy cases during constant folding. This
1461 case is not obvious, so emit (constant_p_rtx (ARGLIST)) and let CSE get a
1462 chance to see if it can deduce whether ARGLIST is constant. */
1464 tmp
= expand_expr (arglist
, NULL_RTX
, VOIDmode
, 0);
1465 tmp
= gen_rtx_CONSTANT_P_RTX (value_mode
, tmp
);
1469 /* Expand a call to one of the builtin math functions (sin, cos, or sqrt).
1470 Return 0 if a normal call should be emitted rather than expanding the
1471 function in-line. EXP is the expression that is a call to the builtin
1472 function; if convenient, the result should be placed in TARGET.
1473 SUBTARGET may be used as the target for computing one of EXP's operands. */
1476 expand_builtin_mathfn (exp
, target
, subtarget
)
1478 rtx target
, subtarget
;
1480 optab builtin_optab
;
1482 tree fndecl
= TREE_OPERAND (TREE_OPERAND (exp
, 0), 0);
1483 tree arglist
= TREE_OPERAND (exp
, 1);
1484 enum machine_mode argmode
;
1486 if (!validate_arglist (arglist
, REAL_TYPE
, VOID_TYPE
))
1489 /* Stabilize and compute the argument. */
1490 if (TREE_CODE (TREE_VALUE (arglist
)) != VAR_DECL
1491 && TREE_CODE (TREE_VALUE (arglist
)) != PARM_DECL
)
1493 exp
= copy_node (exp
);
1494 TREE_OPERAND (exp
, 1) = arglist
;
1495 /* Wrap the computation of the argument in a SAVE_EXPR. That
1496 way, if we need to expand the argument again (as in the
1497 flag_errno_math case below where we cannot directly set
1498 errno), we will not perform side-effects more than once.
1499 Note that here we're mutating the original EXP as well as the
1500 copy; that's the right thing to do in case the original EXP
1501 is expanded later. */
1502 TREE_VALUE (arglist
) = save_expr (TREE_VALUE (arglist
));
1503 arglist
= copy_node (arglist
);
1505 op0
= expand_expr (TREE_VALUE (arglist
), subtarget
, VOIDmode
, 0);
1507 /* Make a suitable register to place result in. */
1508 target
= gen_reg_rtx (TYPE_MODE (TREE_TYPE (exp
)));
1513 switch (DECL_FUNCTION_CODE (fndecl
))
1518 builtin_optab
= sin_optab
; break;
1522 builtin_optab
= cos_optab
; break;
1524 case BUILT_IN_SQRTF
:
1525 case BUILT_IN_SQRTL
:
1526 builtin_optab
= sqrt_optab
; break;
1530 builtin_optab
= exp_optab
; break;
1534 builtin_optab
= log_optab
; break;
1539 /* Compute into TARGET.
1540 Set TARGET to wherever the result comes back. */
1541 argmode
= TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist
)));
1542 target
= expand_unop (argmode
, builtin_optab
, op0
, target
, 0);
1544 /* If we were unable to expand via the builtin, stop the
1545 sequence (without outputting the insns) and return 0, causing
1546 a call to the library function. */
1553 /* If errno must be maintained, we must set it to EDOM for NaN results. */
1555 if (flag_errno_math
&& HONOR_NANS (argmode
))
1559 lab1
= gen_label_rtx ();
1561 /* Test the result; if it is NaN, set errno=EDOM because
1562 the argument was not in the domain. */
1563 emit_cmp_and_jump_insns (target
, target
, EQ
, 0, GET_MODE (target
),
1568 #ifdef GEN_ERRNO_RTX
1569 rtx errno_rtx
= GEN_ERRNO_RTX
;
1572 = gen_rtx_MEM (word_mode
, gen_rtx_SYMBOL_REF (Pmode
, "errno"));
1575 emit_move_insn (errno_rtx
, GEN_INT (TARGET_EDOM
));
1578 /* We can't set errno=EDOM directly; let the library call do it.
1579 Pop the arguments right away in case the call gets deleted. */
1581 expand_call (exp
, target
, 0);
1588 /* Output the entire sequence. */
1589 insns
= get_insns ();
1596 /* Expand expression EXP which is a call to the strlen builtin. Return 0
1597 if we failed the caller should emit a normal call, otherwise
1598 try to get the result in TARGET, if convenient. */
1601 expand_builtin_strlen (exp
, target
)
1605 tree arglist
= TREE_OPERAND (exp
, 1);
1606 enum machine_mode value_mode
= TYPE_MODE (TREE_TYPE (exp
));
1608 if (!validate_arglist (arglist
, POINTER_TYPE
, VOID_TYPE
))
1613 tree src
= TREE_VALUE (arglist
);
1616 = get_pointer_alignment (src
, BIGGEST_ALIGNMENT
) / BITS_PER_UNIT
;
1618 rtx result
, src_reg
, char_rtx
, before_strlen
;
1619 enum machine_mode insn_mode
= value_mode
, char_mode
;
1620 enum insn_code icode
= CODE_FOR_nothing
;
1622 /* If SRC is not a pointer type, don't do this operation inline. */
1626 /* Bail out if we can't compute strlen in the right mode. */
1627 while (insn_mode
!= VOIDmode
)
1629 icode
= strlen_optab
->handlers
[(int) insn_mode
].insn_code
;
1630 if (icode
!= CODE_FOR_nothing
)
1633 insn_mode
= GET_MODE_WIDER_MODE (insn_mode
);
1635 if (insn_mode
== VOIDmode
)
1638 /* Make a place to write the result of the instruction. */
1641 && GET_CODE (result
) == REG
1642 && GET_MODE (result
) == insn_mode
1643 && REGNO (result
) >= FIRST_PSEUDO_REGISTER
))
1644 result
= gen_reg_rtx (insn_mode
);
1646 /* Make a place to hold the source address. We will not expand
1647 the actual source until we are sure that the expansion will
1648 not fail -- there are trees that cannot be expanded twice. */
1649 src_reg
= gen_reg_rtx (Pmode
);
1651 /* Mark the beginning of the strlen sequence so we can emit the
1652 source operand later. */
1653 before_strlen
= get_last_insn();
1655 char_rtx
= const0_rtx
;
1656 char_mode
= insn_data
[(int) icode
].operand
[2].mode
;
1657 if (! (*insn_data
[(int) icode
].operand
[2].predicate
) (char_rtx
,
1659 char_rtx
= copy_to_mode_reg (char_mode
, char_rtx
);
1661 pat
= GEN_FCN (icode
) (result
, gen_rtx_MEM (BLKmode
, src_reg
),
1662 char_rtx
, GEN_INT (align
));
1667 /* Now that we are assured of success, expand the source. */
1669 pat
= memory_address (BLKmode
,
1670 expand_expr (src
, src_reg
, ptr_mode
, EXPAND_SUM
));
1672 emit_move_insn (src_reg
, pat
);
1677 emit_insn_after (pat
, before_strlen
);
1679 emit_insn_before (pat
, get_insns ());
1681 /* Return the value in the proper mode for this function. */
1682 if (GET_MODE (result
) == value_mode
)
1684 else if (target
!= 0)
1685 convert_move (target
, result
, 0);
1687 target
= convert_to_mode (value_mode
, result
, 0);
1693 /* Expand a call to the strstr builtin. Return 0 if we failed the
1694 caller should emit a normal call, otherwise try to get the result
1695 in TARGET, if convenient (and in mode MODE if that's convenient). */
1698 expand_builtin_strstr (arglist
, target
, mode
)
1701 enum machine_mode mode
;
1703 if (!validate_arglist (arglist
, POINTER_TYPE
, POINTER_TYPE
, VOID_TYPE
))
1707 tree s1
= TREE_VALUE (arglist
), s2
= TREE_VALUE (TREE_CHAIN (arglist
));
1709 const char *p1
, *p2
;
1718 const char *r
= strstr (p1
, p2
);
1723 /* Return an offset into the constant string argument. */
1724 return expand_expr (fold (build (PLUS_EXPR
, TREE_TYPE (s1
),
1725 s1
, ssize_int (r
- p1
))),
1726 target
, mode
, EXPAND_NORMAL
);
1730 return expand_expr (s1
, target
, mode
, EXPAND_NORMAL
);
1735 fn
= built_in_decls
[BUILT_IN_STRCHR
];
1739 /* New argument list transforming strstr(s1, s2) to
1740 strchr(s1, s2[0]). */
1742 build_tree_list (NULL_TREE
, build_int_2 (p2
[0], 0));
1743 arglist
= tree_cons (NULL_TREE
, s1
, arglist
);
1744 return expand_expr (build_function_call_expr (fn
, arglist
),
1745 target
, mode
, EXPAND_NORMAL
);
1749 /* Expand a call to the strchr builtin. Return 0 if we failed the
1750 caller should emit a normal call, otherwise try to get the result
1751 in TARGET, if convenient (and in mode MODE if that's convenient). */
1754 expand_builtin_strchr (arglist
, target
, mode
)
1757 enum machine_mode mode
;
1759 if (!validate_arglist (arglist
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
1763 tree s1
= TREE_VALUE (arglist
), s2
= TREE_VALUE (TREE_CHAIN (arglist
));
1766 if (TREE_CODE (s2
) != INTEGER_CST
)
1775 if (target_char_cast (s2
, &c
))
1783 /* Return an offset into the constant string argument. */
1784 return expand_expr (fold (build (PLUS_EXPR
, TREE_TYPE (s1
),
1785 s1
, ssize_int (r
- p1
))),
1786 target
, mode
, EXPAND_NORMAL
);
1789 /* FIXME: Should use here strchrM optab so that ports can optimize
1795 /* Expand a call to the strrchr builtin. Return 0 if we failed the
1796 caller should emit a normal call, otherwise try to get the result
1797 in TARGET, if convenient (and in mode MODE if that's convenient). */
1800 expand_builtin_strrchr (arglist
, target
, mode
)
1803 enum machine_mode mode
;
1805 if (!validate_arglist (arglist
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
1809 tree s1
= TREE_VALUE (arglist
), s2
= TREE_VALUE (TREE_CHAIN (arglist
));
1813 if (TREE_CODE (s2
) != INTEGER_CST
)
1822 if (target_char_cast (s2
, &c
))
1825 r
= strrchr (p1
, c
);
1830 /* Return an offset into the constant string argument. */
1831 return expand_expr (fold (build (PLUS_EXPR
, TREE_TYPE (s1
),
1832 s1
, ssize_int (r
- p1
))),
1833 target
, mode
, EXPAND_NORMAL
);
1836 if (! integer_zerop (s2
))
1839 fn
= built_in_decls
[BUILT_IN_STRCHR
];
1843 /* Transform strrchr(s1, '\0') to strchr(s1, '\0'). */
1844 return expand_expr (build_function_call_expr (fn
, arglist
),
1845 target
, mode
, EXPAND_NORMAL
);
1849 /* Expand a call to the strpbrk builtin. Return 0 if we failed the
1850 caller should emit a normal call, otherwise try to get the result
1851 in TARGET, if convenient (and in mode MODE if that's convenient). */
1854 expand_builtin_strpbrk (arglist
, target
, mode
)
1857 enum machine_mode mode
;
1859 if (!validate_arglist (arglist
, POINTER_TYPE
, POINTER_TYPE
, VOID_TYPE
))
1863 tree s1
= TREE_VALUE (arglist
), s2
= TREE_VALUE (TREE_CHAIN (arglist
));
1865 const char *p1
, *p2
;
1874 const char *r
= strpbrk (p1
, p2
);
1879 /* Return an offset into the constant string argument. */
1880 return expand_expr (fold (build (PLUS_EXPR
, TREE_TYPE (s1
),
1881 s1
, ssize_int (r
- p1
))),
1882 target
, mode
, EXPAND_NORMAL
);
1887 /* strpbrk(x, "") == NULL.
1888 Evaluate and ignore the arguments in case they had
1890 expand_expr (s1
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
1895 return 0; /* Really call strpbrk. */
1897 fn
= built_in_decls
[BUILT_IN_STRCHR
];
1901 /* New argument list transforming strpbrk(s1, s2) to
1902 strchr(s1, s2[0]). */
1904 build_tree_list (NULL_TREE
, build_int_2 (p2
[0], 0));
1905 arglist
= tree_cons (NULL_TREE
, s1
, arglist
);
1906 return expand_expr (build_function_call_expr (fn
, arglist
),
1907 target
, mode
, EXPAND_NORMAL
);
1911 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
1912 bytes from constant string DATA + OFFSET and return it as target
1916 builtin_memcpy_read_str (data
, offset
, mode
)
1918 HOST_WIDE_INT offset
;
1919 enum machine_mode mode
;
1921 const char *str
= (const char *) data
;
1924 || ((unsigned HOST_WIDE_INT
) offset
+ GET_MODE_SIZE (mode
)
1925 > strlen (str
) + 1))
1926 abort (); /* Attempt to read past the end of constant string. */
1928 return c_readstr (str
+ offset
, mode
);
1931 /* Expand a call to the memcpy builtin, with arguments in ARGLIST.
1932 Return 0 if we failed, the caller should emit a normal call, otherwise
1933 try to get the result in TARGET, if convenient (and in mode MODE if
1934 that's convenient). */
1937 expand_builtin_memcpy (arglist
, target
, mode
)
1940 enum machine_mode mode
;
1942 if (!validate_arglist (arglist
,
1943 POINTER_TYPE
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
1947 tree dest
= TREE_VALUE (arglist
);
1948 tree src
= TREE_VALUE (TREE_CHAIN (arglist
));
1949 tree len
= TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist
)));
1950 const char *src_str
;
1952 unsigned int src_align
= get_pointer_alignment (src
, BIGGEST_ALIGNMENT
);
1953 unsigned int dest_align
1954 = get_pointer_alignment (dest
, BIGGEST_ALIGNMENT
);
1955 rtx dest_mem
, src_mem
, dest_addr
, len_rtx
;
1957 /* If DEST is not a pointer type, call the normal function. */
1958 if (dest_align
== 0)
1961 /* If the LEN parameter is zero, return DEST. */
1962 if (host_integerp (len
, 1) && tree_low_cst (len
, 1) == 0)
1964 /* Evaluate and ignore SRC in case it has side-effects. */
1965 expand_expr (src
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
1966 return expand_expr (dest
, target
, mode
, EXPAND_NORMAL
);
1969 /* If either SRC is not a pointer type, don't do this
1970 operation in-line. */
1974 dest_mem
= get_memory_rtx (dest
);
1975 set_mem_align (dest_mem
, dest_align
);
1976 len_rtx
= expand_expr (len
, NULL_RTX
, VOIDmode
, 0);
1977 src_str
= c_getstr (src
);
1979 /* If SRC is a string constant and block move would be done
1980 by pieces, we can avoid loading the string from memory
1981 and only stored the computed constants. */
1983 && GET_CODE (len_rtx
) == CONST_INT
1984 && (unsigned HOST_WIDE_INT
) INTVAL (len_rtx
) <= strlen (src_str
) + 1
1985 && can_store_by_pieces (INTVAL (len_rtx
), builtin_memcpy_read_str
,
1986 (PTR
) src_str
, dest_align
))
1988 store_by_pieces (dest_mem
, INTVAL (len_rtx
),
1989 builtin_memcpy_read_str
,
1990 (PTR
) src_str
, dest_align
);
1991 dest_mem
= force_operand (XEXP (dest_mem
, 0), NULL_RTX
);
1992 #ifdef POINTERS_EXTEND_UNSIGNED
1993 if (GET_MODE (dest_mem
) != ptr_mode
)
1994 dest_mem
= convert_memory_address (ptr_mode
, dest_mem
);
1999 src_mem
= get_memory_rtx (src
);
2000 set_mem_align (src_mem
, src_align
);
2002 /* Copy word part most expediently. */
2003 dest_addr
= emit_block_move (dest_mem
, src_mem
, len_rtx
);
2007 dest_addr
= force_operand (XEXP (dest_mem
, 0), NULL_RTX
);
2008 #ifdef POINTERS_EXTEND_UNSIGNED
2009 if (GET_MODE (dest_addr
) != ptr_mode
)
2010 dest_addr
= convert_memory_address (ptr_mode
, dest_addr
);
2018 /* Expand expression EXP, which is a call to the strcpy builtin. Return 0
2019 if we failed the caller should emit a normal call, otherwise try to get
2020 the result in TARGET, if convenient (and in mode MODE if that's
2024 expand_builtin_strcpy (exp
, target
, mode
)
2027 enum machine_mode mode
;
2029 tree arglist
= TREE_OPERAND (exp
, 1);
2032 if (!validate_arglist (arglist
, POINTER_TYPE
, POINTER_TYPE
, VOID_TYPE
))
2035 fn
= built_in_decls
[BUILT_IN_MEMCPY
];
2039 len
= c_strlen (TREE_VALUE (TREE_CHAIN (arglist
)));
2043 len
= size_binop (PLUS_EXPR
, len
, ssize_int (1));
2044 chainon (arglist
, build_tree_list (NULL_TREE
, len
));
2045 return expand_expr (build_function_call_expr (fn
, arglist
),
2046 target
, mode
, EXPAND_NORMAL
);
2049 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
2050 bytes from constant string DATA + OFFSET and return it as target
2054 builtin_strncpy_read_str (data
, offset
, mode
)
2056 HOST_WIDE_INT offset
;
2057 enum machine_mode mode
;
2059 const char *str
= (const char *) data
;
2061 if ((unsigned HOST_WIDE_INT
) offset
> strlen (str
))
2064 return c_readstr (str
+ offset
, mode
);
2067 /* Expand expression EXP, which is a call to the strncpy builtin. Return 0
2068 if we failed the caller should emit a normal call. */
2071 expand_builtin_strncpy (arglist
, target
, mode
)
2074 enum machine_mode mode
;
2076 if (!validate_arglist (arglist
,
2077 POINTER_TYPE
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
2081 tree slen
= c_strlen (TREE_VALUE (TREE_CHAIN (arglist
)));
2082 tree len
= TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist
)));
2085 /* We must be passed a constant len parameter. */
2086 if (TREE_CODE (len
) != INTEGER_CST
)
2089 /* If the len parameter is zero, return the dst parameter. */
2090 if (integer_zerop (len
))
2092 /* Evaluate and ignore the src argument in case it has
2094 expand_expr (TREE_VALUE (TREE_CHAIN (arglist
)), const0_rtx
,
2095 VOIDmode
, EXPAND_NORMAL
);
2096 /* Return the dst parameter. */
2097 return expand_expr (TREE_VALUE (arglist
), target
, mode
,
2101 /* Now, we must be passed a constant src ptr parameter. */
2102 if (slen
== 0 || TREE_CODE (slen
) != INTEGER_CST
)
2105 slen
= size_binop (PLUS_EXPR
, slen
, ssize_int (1));
2107 /* We're required to pad with trailing zeros if the requested
2108 len is greater than strlen(s2)+1. In that case try to
2109 use store_by_pieces, if it fails, punt. */
2110 if (tree_int_cst_lt (slen
, len
))
2112 tree dest
= TREE_VALUE (arglist
);
2113 unsigned int dest_align
2114 = get_pointer_alignment (dest
, BIGGEST_ALIGNMENT
);
2115 const char *p
= c_getstr (TREE_VALUE (TREE_CHAIN (arglist
)));
2118 if (!p
|| dest_align
== 0 || !host_integerp (len
, 1)
2119 || !can_store_by_pieces (tree_low_cst (len
, 1),
2120 builtin_strncpy_read_str
,
2121 (PTR
) p
, dest_align
))
2124 dest_mem
= get_memory_rtx (dest
);
2125 store_by_pieces (dest_mem
, tree_low_cst (len
, 1),
2126 builtin_strncpy_read_str
,
2127 (PTR
) p
, dest_align
);
2128 dest_mem
= force_operand (XEXP (dest_mem
, 0), NULL_RTX
);
2129 #ifdef POINTERS_EXTEND_UNSIGNED
2130 if (GET_MODE (dest_mem
) != ptr_mode
)
2131 dest_mem
= convert_memory_address (ptr_mode
, dest_mem
);
2136 /* OK transform into builtin memcpy. */
2137 fn
= built_in_decls
[BUILT_IN_MEMCPY
];
2140 return expand_expr (build_function_call_expr (fn
, arglist
),
2141 target
, mode
, EXPAND_NORMAL
);
2145 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
2146 bytes from constant string DATA + OFFSET and return it as target
2150 builtin_memset_read_str (data
, offset
, mode
)
2152 HOST_WIDE_INT offset ATTRIBUTE_UNUSED
;
2153 enum machine_mode mode
;
2155 const char *c
= (const char *) data
;
2156 char *p
= alloca (GET_MODE_SIZE (mode
));
2158 memset (p
, *c
, GET_MODE_SIZE (mode
));
2160 return c_readstr (p
, mode
);
2163 /* Callback routine for store_by_pieces. Return the RTL of a register
2164 containing GET_MODE_SIZE (MODE) consecutive copies of the unsigned
2165 char value given in the RTL register data. For example, if mode is
2166 4 bytes wide, return the RTL for 0x01010101*data. */
2169 builtin_memset_gen_str (data
, offset
, mode
)
2171 HOST_WIDE_INT offset ATTRIBUTE_UNUSED
;
2172 enum machine_mode mode
;
2178 size
= GET_MODE_SIZE (mode
);
2183 memset (p
, 1, size
);
2184 coeff
= c_readstr (p
, mode
);
2186 target
= convert_to_mode (mode
, (rtx
)data
, 1);
2187 target
= expand_mult (mode
, target
, coeff
, NULL_RTX
, 1);
2188 return force_reg (mode
, target
);
2191 /* Expand expression EXP, which is a call to the memset builtin. Return 0
2192 if we failed the caller should emit a normal call, otherwise try to get
2193 the result in TARGET, if convenient (and in mode MODE if that's
2197 expand_builtin_memset (exp
, target
, mode
)
2200 enum machine_mode mode
;
2202 tree arglist
= TREE_OPERAND (exp
, 1);
2204 if (!validate_arglist (arglist
,
2205 POINTER_TYPE
, INTEGER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
2209 tree dest
= TREE_VALUE (arglist
);
2210 tree val
= TREE_VALUE (TREE_CHAIN (arglist
));
2211 tree len
= TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist
)));
2214 unsigned int dest_align
2215 = get_pointer_alignment (dest
, BIGGEST_ALIGNMENT
);
2216 rtx dest_mem
, dest_addr
, len_rtx
;
2218 /* If DEST is not a pointer type, don't do this
2219 operation in-line. */
2220 if (dest_align
== 0)
2223 /* If the LEN parameter is zero, return DEST. */
2224 if (host_integerp (len
, 1) && tree_low_cst (len
, 1) == 0)
2226 /* Evaluate and ignore VAL in case it has side-effects. */
2227 expand_expr (val
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2228 return expand_expr (dest
, target
, mode
, EXPAND_NORMAL
);
2231 if (TREE_CODE (val
) != INTEGER_CST
)
2235 if (!host_integerp (len
, 1))
2238 if (optimize_size
&& tree_low_cst (len
, 1) > 1)
2241 /* Assume that we can memset by pieces if we can store the
2242 * the coefficients by pieces (in the required modes).
2243 * We can't pass builtin_memset_gen_str as that emits RTL. */
2245 if (!can_store_by_pieces (tree_low_cst (len
, 1),
2246 builtin_memset_read_str
,
2247 (PTR
) &c
, dest_align
))
2250 val
= fold (build1 (CONVERT_EXPR
, unsigned_char_type_node
, val
));
2251 val_rtx
= expand_expr (val
, NULL_RTX
, VOIDmode
, 0);
2252 val_rtx
= force_reg (TYPE_MODE (unsigned_char_type_node
),
2254 dest_mem
= get_memory_rtx (dest
);
2255 store_by_pieces (dest_mem
, tree_low_cst (len
, 1),
2256 builtin_memset_gen_str
,
2257 (PTR
)val_rtx
, dest_align
);
2258 dest_mem
= force_operand (XEXP (dest_mem
, 0), NULL_RTX
);
2259 #ifdef POINTERS_EXTEND_UNSIGNED
2260 if (GET_MODE (dest_mem
) != ptr_mode
)
2261 dest_mem
= convert_memory_address (ptr_mode
, dest_mem
);
2266 if (target_char_cast (val
, &c
))
2271 if (!host_integerp (len
, 1))
2273 if (!can_store_by_pieces (tree_low_cst (len
, 1),
2274 builtin_memset_read_str
, (PTR
) &c
,
2278 dest_mem
= get_memory_rtx (dest
);
2279 store_by_pieces (dest_mem
, tree_low_cst (len
, 1),
2280 builtin_memset_read_str
,
2281 (PTR
) &c
, dest_align
);
2282 dest_mem
= force_operand (XEXP (dest_mem
, 0), NULL_RTX
);
2283 #ifdef POINTERS_EXTEND_UNSIGNED
2284 if (GET_MODE (dest_mem
) != ptr_mode
)
2285 dest_mem
= convert_memory_address (ptr_mode
, dest_mem
);
2290 len_rtx
= expand_expr (len
, NULL_RTX
, VOIDmode
, 0);
2292 dest_mem
= get_memory_rtx (dest
);
2293 set_mem_align (dest_mem
, dest_align
);
2294 dest_addr
= clear_storage (dest_mem
, len_rtx
);
2298 dest_addr
= force_operand (XEXP (dest_mem
, 0), NULL_RTX
);
2299 #ifdef POINTERS_EXTEND_UNSIGNED
2300 if (GET_MODE (dest_addr
) != ptr_mode
)
2301 dest_addr
= convert_memory_address (ptr_mode
, dest_addr
);
2309 /* Expand expression EXP, which is a call to the bzero builtin. Return 0
2310 if we failed the caller should emit a normal call. */
2313 expand_builtin_bzero (exp
)
2316 tree arglist
= TREE_OPERAND (exp
, 1);
2317 tree dest
, size
, newarglist
;
2320 if (!validate_arglist (arglist
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
2323 dest
= TREE_VALUE (arglist
);
2324 size
= TREE_VALUE (TREE_CHAIN (arglist
));
2326 /* New argument list transforming bzero(ptr x, int y) to
2327 memset(ptr x, int 0, size_t y). This is done this way
2328 so that if it isn't expanded inline, we fallback to
2329 calling bzero instead of memset. */
2331 newarglist
= build_tree_list (NULL_TREE
, convert (sizetype
, size
));
2332 newarglist
= tree_cons (NULL_TREE
, integer_zero_node
, newarglist
);
2333 newarglist
= tree_cons (NULL_TREE
, dest
, newarglist
);
2335 TREE_OPERAND (exp
, 1) = newarglist
;
2336 result
= expand_builtin_memset (exp
, const0_rtx
, VOIDmode
);
2338 /* Always restore the original arguments. */
2339 TREE_OPERAND (exp
, 1) = arglist
;
2344 /* Expand expression EXP, which is a call to the memcmp or the strcmp builtin.
2345 ARGLIST is the argument list for this call. Return 0 if we failed and the
2346 caller should emit a normal call, otherwise try to get the result in
2347 TARGET, if convenient (and in mode MODE, if that's convenient). */
2350 expand_builtin_memcmp (exp
, arglist
, target
, mode
)
2351 tree exp ATTRIBUTE_UNUSED
;
2354 enum machine_mode mode
;
2356 tree arg1
, arg2
, len
;
2357 const char *p1
, *p2
;
2359 if (!validate_arglist (arglist
,
2360 POINTER_TYPE
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
2363 arg1
= TREE_VALUE (arglist
);
2364 arg2
= TREE_VALUE (TREE_CHAIN (arglist
));
2365 len
= TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist
)));
2367 /* If the len parameter is zero, return zero. */
2368 if (host_integerp (len
, 1) && tree_low_cst (len
, 1) == 0)
2370 /* Evaluate and ignore arg1 and arg2 in case they have
2372 expand_expr (arg1
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2373 expand_expr (arg2
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2377 p1
= c_getstr (arg1
);
2378 p2
= c_getstr (arg2
);
2380 /* If all arguments are constant, and the value of len is not greater
2381 than the lengths of arg1 and arg2, evaluate at compile-time. */
2382 if (host_integerp (len
, 1) && p1
&& p2
2383 && compare_tree_int (len
, strlen (p1
) + 1) <= 0
2384 && compare_tree_int (len
, strlen (p2
) + 1) <= 0)
2386 const int r
= memcmp (p1
, p2
, tree_low_cst (len
, 1));
2388 return (r
< 0 ? constm1_rtx
: (r
> 0 ? const1_rtx
: const0_rtx
));
2391 /* If len parameter is one, return an expression corresponding to
2392 (*(const unsigned char*)arg1 - (const unsigned char*)arg2). */
2393 if (host_integerp (len
, 1) && tree_low_cst (len
, 1) == 1)
2395 tree cst_uchar_node
= build_type_variant (unsigned_char_type_node
, 1, 0);
2396 tree cst_uchar_ptr_node
= build_pointer_type (cst_uchar_node
);
2398 fold (build1 (CONVERT_EXPR
, integer_type_node
,
2399 build1 (INDIRECT_REF
, cst_uchar_node
,
2400 build1 (NOP_EXPR
, cst_uchar_ptr_node
, arg1
))));
2402 fold (build1 (CONVERT_EXPR
, integer_type_node
,
2403 build1 (INDIRECT_REF
, cst_uchar_node
,
2404 build1 (NOP_EXPR
, cst_uchar_ptr_node
, arg2
))));
2405 tree result
= fold (build (MINUS_EXPR
, integer_type_node
, ind1
, ind2
));
2406 return expand_expr (result
, target
, mode
, EXPAND_NORMAL
);
2409 #ifdef HAVE_cmpstrsi
2411 rtx arg1_rtx
, arg2_rtx
, arg3_rtx
;
2416 = get_pointer_alignment (arg1
, BIGGEST_ALIGNMENT
) / BITS_PER_UNIT
;
2418 = get_pointer_alignment (arg2
, BIGGEST_ALIGNMENT
) / BITS_PER_UNIT
;
2419 enum machine_mode insn_mode
2420 = insn_data
[(int) CODE_FOR_cmpstrsi
].operand
[0].mode
;
2422 /* If we don't have POINTER_TYPE, call the function. */
2423 if (arg1_align
== 0 || arg2_align
== 0)
2426 /* Make a place to write the result of the instruction. */
2429 && GET_CODE (result
) == REG
&& GET_MODE (result
) == insn_mode
2430 && REGNO (result
) >= FIRST_PSEUDO_REGISTER
))
2431 result
= gen_reg_rtx (insn_mode
);
2433 arg1_rtx
= get_memory_rtx (arg1
);
2434 arg2_rtx
= get_memory_rtx (arg2
);
2435 arg3_rtx
= expand_expr (len
, NULL_RTX
, VOIDmode
, 0);
2439 insn
= gen_cmpstrsi (result
, arg1_rtx
, arg2_rtx
, arg3_rtx
,
2440 GEN_INT (MIN (arg1_align
, arg2_align
)));
2445 emit_library_call_value (memcmp_libfunc
, result
, LCT_PURE_MAKE_BLOCK
,
2446 TYPE_MODE (integer_type_node
), 3,
2447 XEXP (arg1_rtx
, 0), Pmode
,
2448 XEXP (arg2_rtx
, 0), Pmode
,
2449 convert_to_mode (TYPE_MODE (sizetype
), arg3_rtx
,
2450 TREE_UNSIGNED (sizetype
)),
2451 TYPE_MODE (sizetype
));
2453 /* Return the value in the proper mode for this function. */
2454 mode
= TYPE_MODE (TREE_TYPE (exp
));
2455 if (GET_MODE (result
) == mode
)
2457 else if (target
!= 0)
2459 convert_move (target
, result
, 0);
2463 return convert_to_mode (mode
, result
, 0);
2470 /* Expand expression EXP, which is a call to the strcmp builtin. Return 0
2471 if we failed the caller should emit a normal call, otherwise try to get
2472 the result in TARGET, if convenient. */
2475 expand_builtin_strcmp (exp
, target
, mode
)
2478 enum machine_mode mode
;
2480 tree arglist
= TREE_OPERAND (exp
, 1);
2481 tree arg1
, arg2
, len
, len2
, fn
;
2482 const char *p1
, *p2
;
2484 if (!validate_arglist (arglist
, POINTER_TYPE
, POINTER_TYPE
, VOID_TYPE
))
2487 arg1
= TREE_VALUE (arglist
);
2488 arg2
= TREE_VALUE (TREE_CHAIN (arglist
));
2490 p1
= c_getstr (arg1
);
2491 p2
= c_getstr (arg2
);
2495 const int i
= strcmp (p1
, p2
);
2496 return (i
< 0 ? constm1_rtx
: (i
> 0 ? const1_rtx
: const0_rtx
));
2499 /* If either arg is "", return an expression corresponding to
2500 (*(const unsigned char*)arg1 - (const unsigned char*)arg2). */
2501 if ((p1
&& *p1
== '\0') || (p2
&& *p2
== '\0'))
2503 tree cst_uchar_node
= build_type_variant (unsigned_char_type_node
, 1, 0);
2504 tree cst_uchar_ptr_node
= build_pointer_type (cst_uchar_node
);
2506 fold (build1 (CONVERT_EXPR
, integer_type_node
,
2507 build1 (INDIRECT_REF
, cst_uchar_node
,
2508 build1 (NOP_EXPR
, cst_uchar_ptr_node
, arg1
))));
2510 fold (build1 (CONVERT_EXPR
, integer_type_node
,
2511 build1 (INDIRECT_REF
, cst_uchar_node
,
2512 build1 (NOP_EXPR
, cst_uchar_ptr_node
, arg2
))));
2513 tree result
= fold (build (MINUS_EXPR
, integer_type_node
, ind1
, ind2
));
2514 return expand_expr (result
, target
, mode
, EXPAND_NORMAL
);
2517 len
= c_strlen (arg1
);
2518 len2
= c_strlen (arg2
);
2521 len
= size_binop (PLUS_EXPR
, ssize_int (1), len
);
2524 len2
= size_binop (PLUS_EXPR
, ssize_int (1), len2
);
2526 /* If we don't have a constant length for the first, use the length
2527 of the second, if we know it. We don't require a constant for
2528 this case; some cost analysis could be done if both are available
2529 but neither is constant. For now, assume they're equally cheap
2530 unless one has side effects.
2532 If both strings have constant lengths, use the smaller. This
2533 could arise if optimization results in strcpy being called with
2534 two fixed strings, or if the code was machine-generated. We should
2535 add some code to the `memcmp' handler below to deal with such
2536 situations, someday. */
2538 if (!len
|| TREE_CODE (len
) != INTEGER_CST
)
2540 if (len2
&& !TREE_SIDE_EFFECTS (len2
))
2545 else if (len2
&& TREE_CODE (len2
) == INTEGER_CST
2546 && tree_int_cst_lt (len2
, len
))
2549 /* If both arguments have side effects, we cannot optimize. */
2550 if (TREE_SIDE_EFFECTS (len
))
2553 fn
= built_in_decls
[BUILT_IN_MEMCMP
];
2557 chainon (arglist
, build_tree_list (NULL_TREE
, len
));
2558 return expand_expr (build_function_call_expr (fn
, arglist
),
2559 target
, mode
, EXPAND_NORMAL
);
2562 /* Expand expression EXP, which is a call to the strncmp builtin. Return 0
2563 if we failed the caller should emit a normal call, otherwise try to get
2564 the result in TARGET, if convenient. */
2567 expand_builtin_strncmp (exp
, target
, mode
)
2570 enum machine_mode mode
;
2572 tree arglist
= TREE_OPERAND (exp
, 1);
2573 tree fn
, newarglist
, len
= 0;
2574 tree arg1
, arg2
, arg3
;
2575 const char *p1
, *p2
;
2577 if (!validate_arglist (arglist
,
2578 POINTER_TYPE
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
2581 arg1
= TREE_VALUE (arglist
);
2582 arg2
= TREE_VALUE (TREE_CHAIN (arglist
));
2583 arg3
= TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist
)));
2585 /* If the len parameter is zero, return zero. */
2586 if (host_integerp (arg3
, 1) && tree_low_cst (arg3
, 1) == 0)
2588 /* Evaluate and ignore arg1 and arg2 in case they have
2590 expand_expr (arg1
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2591 expand_expr (arg2
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2595 p1
= c_getstr (arg1
);
2596 p2
= c_getstr (arg2
);
2598 /* If all arguments are constant, evaluate at compile-time. */
2599 if (host_integerp (arg3
, 1) && p1
&& p2
)
2601 const int r
= strncmp (p1
, p2
, tree_low_cst (arg3
, 1));
2602 return (r
< 0 ? constm1_rtx
: (r
> 0 ? const1_rtx
: const0_rtx
));
2605 /* If len == 1 or (either string parameter is "" and (len >= 1)),
2606 return (*(const u_char*)arg1 - *(const u_char*)arg2). */
2607 if (host_integerp (arg3
, 1)
2608 && (tree_low_cst (arg3
, 1) == 1
2609 || (tree_low_cst (arg3
, 1) > 1
2610 && ((p1
&& *p1
== '\0') || (p2
&& *p2
== '\0')))))
2612 tree cst_uchar_node
= build_type_variant (unsigned_char_type_node
, 1, 0);
2613 tree cst_uchar_ptr_node
= build_pointer_type (cst_uchar_node
);
2615 fold (build1 (CONVERT_EXPR
, integer_type_node
,
2616 build1 (INDIRECT_REF
, cst_uchar_node
,
2617 build1 (NOP_EXPR
, cst_uchar_ptr_node
, arg1
))));
2619 fold (build1 (CONVERT_EXPR
, integer_type_node
,
2620 build1 (INDIRECT_REF
, cst_uchar_node
,
2621 build1 (NOP_EXPR
, cst_uchar_ptr_node
, arg2
))));
2622 tree result
= fold (build (MINUS_EXPR
, integer_type_node
, ind1
, ind2
));
2623 return expand_expr (result
, target
, mode
, EXPAND_NORMAL
);
2626 /* If c_strlen can determine an expression for one of the string
2627 lengths, and it doesn't have side effects, then call
2628 expand_builtin_memcmp() using length MIN(strlen(string)+1, arg3). */
2630 /* Perhaps one of the strings is really constant, if so prefer
2631 that constant length over the other string's length. */
2633 len
= c_strlen (arg1
);
2635 len
= c_strlen (arg2
);
2637 /* If we still don't have a len, try either string arg as long
2638 as they don't have side effects. */
2639 if (!len
&& !TREE_SIDE_EFFECTS (arg1
))
2640 len
= c_strlen (arg1
);
2641 if (!len
&& !TREE_SIDE_EFFECTS (arg2
))
2642 len
= c_strlen (arg2
);
2643 /* If we still don't have a length, punt. */
2647 fn
= built_in_decls
[BUILT_IN_MEMCMP
];
2651 /* Add one to the string length. */
2652 len
= fold (size_binop (PLUS_EXPR
, len
, ssize_int (1)));
2654 /* The actual new length parameter is MIN(len,arg3). */
2655 len
= fold (build (MIN_EXPR
, TREE_TYPE (len
), len
, arg3
));
2657 newarglist
= build_tree_list (NULL_TREE
, len
);
2658 newarglist
= tree_cons (NULL_TREE
, arg2
, newarglist
);
2659 newarglist
= tree_cons (NULL_TREE
, arg1
, newarglist
);
2660 return expand_expr (build_function_call_expr (fn
, newarglist
),
2661 target
, mode
, EXPAND_NORMAL
);
2664 /* Expand expression EXP, which is a call to the strcat builtin.
2665 Return 0 if we failed the caller should emit a normal call,
2666 otherwise try to get the result in TARGET, if convenient. */
2669 expand_builtin_strcat (arglist
, target
, mode
)
2672 enum machine_mode mode
;
2674 if (!validate_arglist (arglist
, POINTER_TYPE
, POINTER_TYPE
, VOID_TYPE
))
2678 tree dst
= TREE_VALUE (arglist
),
2679 src
= TREE_VALUE (TREE_CHAIN (arglist
));
2680 const char *p
= c_getstr (src
);
2682 /* If the string length is zero, return the dst parameter. */
2683 if (p
&& *p
== '\0')
2684 return expand_expr (dst
, target
, mode
, EXPAND_NORMAL
);
2690 /* Expand expression EXP, which is a call to the strncat builtin.
2691 Return 0 if we failed the caller should emit a normal call,
2692 otherwise try to get the result in TARGET, if convenient. */
2695 expand_builtin_strncat (arglist
, target
, mode
)
2698 enum machine_mode mode
;
2700 if (!validate_arglist (arglist
,
2701 POINTER_TYPE
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
2705 tree dst
= TREE_VALUE (arglist
),
2706 src
= TREE_VALUE (TREE_CHAIN (arglist
)),
2707 len
= TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist
)));
2708 const char *p
= c_getstr (src
);
2710 /* If the requested length is zero, or the src parameter string
2711 length is zero, return the dst parameter. */
2712 if (integer_zerop (len
) || (p
&& *p
== '\0'))
2714 /* Evaluate and ignore the src and len parameters in case
2715 they have side-effects. */
2716 expand_expr (src
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2717 expand_expr (len
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2718 return expand_expr (dst
, target
, mode
, EXPAND_NORMAL
);
2721 /* If the requested len is greater than or equal to the string
2722 length, call strcat. */
2723 if (TREE_CODE (len
) == INTEGER_CST
&& p
2724 && compare_tree_int (len
, strlen (p
)) >= 0)
2727 = tree_cons (NULL_TREE
, dst
, build_tree_list (NULL_TREE
, src
));
2728 tree fn
= built_in_decls
[BUILT_IN_STRCAT
];
2730 /* If the replacement _DECL isn't initialized, don't do the
2735 return expand_expr (build_function_call_expr (fn
, newarglist
),
2736 target
, mode
, EXPAND_NORMAL
);
2742 /* Expand expression EXP, which is a call to the strspn builtin.
2743 Return 0 if we failed the caller should emit a normal call,
2744 otherwise try to get the result in TARGET, if convenient. */
2747 expand_builtin_strspn (arglist
, target
, mode
)
2750 enum machine_mode mode
;
2752 if (!validate_arglist (arglist
, POINTER_TYPE
, POINTER_TYPE
, VOID_TYPE
))
2756 tree s1
= TREE_VALUE (arglist
), s2
= TREE_VALUE (TREE_CHAIN (arglist
));
2757 const char *p1
= c_getstr (s1
), *p2
= c_getstr (s2
);
2759 /* If both arguments are constants, evaluate at compile-time. */
2762 const size_t r
= strspn (p1
, p2
);
2763 return expand_expr (size_int (r
), target
, mode
, EXPAND_NORMAL
);
2766 /* If either argument is "", return 0. */
2767 if ((p1
&& *p1
== '\0') || (p2
&& *p2
== '\0'))
2769 /* Evaluate and ignore both arguments in case either one has
2771 expand_expr (s1
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2772 expand_expr (s2
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2779 /* Expand expression EXP, which is a call to the strcspn builtin.
2780 Return 0 if we failed the caller should emit a normal call,
2781 otherwise try to get the result in TARGET, if convenient. */
2784 expand_builtin_strcspn (arglist
, target
, mode
)
2787 enum machine_mode mode
;
2789 if (!validate_arglist (arglist
, POINTER_TYPE
, POINTER_TYPE
, VOID_TYPE
))
2793 tree s1
= TREE_VALUE (arglist
), s2
= TREE_VALUE (TREE_CHAIN (arglist
));
2794 const char *p1
= c_getstr (s1
), *p2
= c_getstr (s2
);
2796 /* If both arguments are constants, evaluate at compile-time. */
2799 const size_t r
= strcspn (p1
, p2
);
2800 return expand_expr (size_int (r
), target
, mode
, EXPAND_NORMAL
);
2803 /* If the first argument is "", return 0. */
2804 if (p1
&& *p1
== '\0')
2806 /* Evaluate and ignore argument s2 in case it has
2808 expand_expr (s2
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2812 /* If the second argument is "", return __builtin_strlen(s1). */
2813 if (p2
&& *p2
== '\0')
2815 tree newarglist
= build_tree_list (NULL_TREE
, s1
),
2816 fn
= built_in_decls
[BUILT_IN_STRLEN
];
2818 /* If the replacement _DECL isn't initialized, don't do the
2823 return expand_expr (build_function_call_expr (fn
, newarglist
),
2824 target
, mode
, EXPAND_NORMAL
);
2830 /* Expand a call to __builtin_saveregs, generating the result in TARGET,
2831 if that's convenient. */
2834 expand_builtin_saveregs ()
2838 /* Don't do __builtin_saveregs more than once in a function.
2839 Save the result of the first call and reuse it. */
2840 if (saveregs_value
!= 0)
2841 return saveregs_value
;
2843 /* When this function is called, it means that registers must be
2844 saved on entry to this function. So we migrate the call to the
2845 first insn of this function. */
2849 #ifdef EXPAND_BUILTIN_SAVEREGS
2850 /* Do whatever the machine needs done in this case. */
2851 val
= EXPAND_BUILTIN_SAVEREGS ();
2853 /* ??? We used to try and build up a call to the out of line function,
2854 guessing about what registers needed saving etc. This became much
2855 harder with __builtin_va_start, since we don't have a tree for a
2856 call to __builtin_saveregs to fall back on. There was exactly one
2857 port (i860) that used this code, and I'm unconvinced it could actually
2858 handle the general case. So we no longer try to handle anything
2859 weird and make the backend absorb the evil. */
2861 error ("__builtin_saveregs not supported by this target");
2868 saveregs_value
= val
;
2870 /* Put the insns after the NOTE that starts the function. If this
2871 is inside a start_sequence, make the outer-level insn chain current, so
2872 the code is placed at the start of the function. */
2873 push_topmost_sequence ();
2874 emit_insn_after (seq
, get_insns ());
2875 pop_topmost_sequence ();
2880 /* __builtin_args_info (N) returns word N of the arg space info
2881 for the current function. The number and meanings of words
2882 is controlled by the definition of CUMULATIVE_ARGS. */
2885 expand_builtin_args_info (exp
)
2888 tree arglist
= TREE_OPERAND (exp
, 1);
2889 int nwords
= sizeof (CUMULATIVE_ARGS
) / sizeof (int);
2890 int *word_ptr
= (int *) ¤t_function_args_info
;
2892 /* These are used by the code below that is if 0'ed away */
2894 tree type
, elts
, result
;
2897 if (sizeof (CUMULATIVE_ARGS
) % sizeof (int) != 0)
2902 if (!host_integerp (TREE_VALUE (arglist
), 0))
2903 error ("argument of `__builtin_args_info' must be constant");
2906 HOST_WIDE_INT wordnum
= tree_low_cst (TREE_VALUE (arglist
), 0);
2908 if (wordnum
< 0 || wordnum
>= nwords
)
2909 error ("argument of `__builtin_args_info' out of range");
2911 return GEN_INT (word_ptr
[wordnum
]);
2915 error ("missing argument in `__builtin_args_info'");
2920 for (i
= 0; i
< nwords
; i
++)
2921 elts
= tree_cons (NULL_TREE
, build_int_2 (word_ptr
[i
], 0));
2923 type
= build_array_type (integer_type_node
,
2924 build_index_type (build_int_2 (nwords
, 0)));
2925 result
= build (CONSTRUCTOR
, type
, NULL_TREE
, nreverse (elts
));
2926 TREE_CONSTANT (result
) = 1;
2927 TREE_STATIC (result
) = 1;
2928 result
= build1 (INDIRECT_REF
, build_pointer_type (type
), result
);
2929 TREE_CONSTANT (result
) = 1;
2930 return expand_expr (result
, NULL_RTX
, VOIDmode
, 0);
2934 /* Expand ARGLIST, from a call to __builtin_next_arg. */
2937 expand_builtin_next_arg (arglist
)
2940 tree fntype
= TREE_TYPE (current_function_decl
);
2942 if (TYPE_ARG_TYPES (fntype
) == 0
2943 || (TREE_VALUE (tree_last (TYPE_ARG_TYPES (fntype
)))
2946 error ("`va_start' used in function with fixed args");
2952 tree last_parm
= tree_last (DECL_ARGUMENTS (current_function_decl
));
2953 tree arg
= TREE_VALUE (arglist
);
2955 /* Strip off all nops for the sake of the comparison. This
2956 is not quite the same as STRIP_NOPS. It does more.
2957 We must also strip off INDIRECT_EXPR for C++ reference
2959 while (TREE_CODE (arg
) == NOP_EXPR
2960 || TREE_CODE (arg
) == CONVERT_EXPR
2961 || TREE_CODE (arg
) == NON_LVALUE_EXPR
2962 || TREE_CODE (arg
) == INDIRECT_REF
)
2963 arg
= TREE_OPERAND (arg
, 0);
2964 if (arg
!= last_parm
)
2965 warning ("second parameter of `va_start' not last named argument");
2968 /* Evidently an out of date version of <stdarg.h>; can't validate
2969 va_start's second argument, but can still work as intended. */
2970 warning ("`__builtin_next_arg' called without an argument");
2972 return expand_binop (Pmode
, add_optab
,
2973 current_function_internal_arg_pointer
,
2974 current_function_arg_offset_rtx
,
2975 NULL_RTX
, 0, OPTAB_LIB_WIDEN
);
2978 /* Make it easier for the backends by protecting the valist argument
2979 from multiple evaluations. */
2982 stabilize_va_list (valist
, needs_lvalue
)
2986 if (TREE_CODE (va_list_type_node
) == ARRAY_TYPE
)
2988 if (TREE_SIDE_EFFECTS (valist
))
2989 valist
= save_expr (valist
);
2991 /* For this case, the backends will be expecting a pointer to
2992 TREE_TYPE (va_list_type_node), but it's possible we've
2993 actually been given an array (an actual va_list_type_node).
2995 if (TREE_CODE (TREE_TYPE (valist
)) == ARRAY_TYPE
)
2997 tree p1
= build_pointer_type (TREE_TYPE (va_list_type_node
));
2998 tree p2
= build_pointer_type (va_list_type_node
);
3000 valist
= build1 (ADDR_EXPR
, p2
, valist
);
3001 valist
= fold (build1 (NOP_EXPR
, p1
, valist
));
3010 if (! TREE_SIDE_EFFECTS (valist
))
3013 pt
= build_pointer_type (va_list_type_node
);
3014 valist
= fold (build1 (ADDR_EXPR
, pt
, valist
));
3015 TREE_SIDE_EFFECTS (valist
) = 1;
3018 if (TREE_SIDE_EFFECTS (valist
))
3019 valist
= save_expr (valist
);
3020 valist
= fold (build1 (INDIRECT_REF
, TREE_TYPE (TREE_TYPE (valist
)),
3027 /* The "standard" implementation of va_start: just assign `nextarg' to
3031 std_expand_builtin_va_start (valist
, nextarg
)
3037 t
= build (MODIFY_EXPR
, TREE_TYPE (valist
), valist
,
3038 make_tree (ptr_type_node
, nextarg
));
3039 TREE_SIDE_EFFECTS (t
) = 1;
3041 expand_expr (t
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
3044 /* Expand ARGLIST, from a call to __builtin_va_start. */
3047 expand_builtin_va_start (arglist
)
3053 chain
= TREE_CHAIN (arglist
);
3055 if (TREE_CHAIN (chain
))
3056 error ("too many arguments to function `va_start'");
3058 nextarg
= expand_builtin_next_arg (chain
);
3059 valist
= stabilize_va_list (TREE_VALUE (arglist
), 1);
3061 #ifdef EXPAND_BUILTIN_VA_START
3062 EXPAND_BUILTIN_VA_START (valist
, nextarg
);
3064 std_expand_builtin_va_start (valist
, nextarg
);
3070 /* The "standard" implementation of va_arg: read the value from the
3071 current (padded) address and increment by the (padded) size. */
3074 std_expand_builtin_va_arg (valist
, type
)
3077 tree addr_tree
, t
, type_size
= NULL
;
3078 tree align
, alignm1
;
3082 /* Compute the rounded size of the type. */
3083 align
= size_int (PARM_BOUNDARY
/ BITS_PER_UNIT
);
3084 alignm1
= size_int (PARM_BOUNDARY
/ BITS_PER_UNIT
- 1);
3085 if (type
== error_mark_node
3086 || (type_size
= TYPE_SIZE_UNIT (TYPE_MAIN_VARIANT (type
))) == NULL
3087 || TREE_OVERFLOW (type_size
))
3088 rounded_size
= size_zero_node
;
3090 rounded_size
= fold (build (MULT_EXPR
, sizetype
,
3091 fold (build (TRUNC_DIV_EXPR
, sizetype
,
3092 fold (build (PLUS_EXPR
, sizetype
,
3093 type_size
, alignm1
)),
3099 if (PAD_VARARGS_DOWN
&& ! integer_zerop (rounded_size
))
3101 /* Small args are padded downward. */
3102 addr_tree
= fold (build (PLUS_EXPR
, TREE_TYPE (addr_tree
), addr_tree
,
3103 fold (build (COND_EXPR
, sizetype
,
3104 fold (build (GT_EXPR
, sizetype
,
3108 fold (build (MINUS_EXPR
, sizetype
,
3113 addr
= expand_expr (addr_tree
, NULL_RTX
, Pmode
, EXPAND_NORMAL
);
3114 addr
= copy_to_reg (addr
);
3116 /* Compute new value for AP. */
3117 if (! integer_zerop (rounded_size
))
3119 t
= build (MODIFY_EXPR
, TREE_TYPE (valist
), valist
,
3120 build (PLUS_EXPR
, TREE_TYPE (valist
), valist
,
3122 TREE_SIDE_EFFECTS (t
) = 1;
3123 expand_expr (t
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
3129 /* Expand __builtin_va_arg, which is not really a builtin function, but
3130 a very special sort of operator. */
3133 expand_builtin_va_arg (valist
, type
)
3137 tree promoted_type
, want_va_type
, have_va_type
;
3139 /* Verify that valist is of the proper type. */
3141 want_va_type
= va_list_type_node
;
3142 have_va_type
= TREE_TYPE (valist
);
3143 if (TREE_CODE (want_va_type
) == ARRAY_TYPE
)
3145 /* If va_list is an array type, the argument may have decayed
3146 to a pointer type, e.g. by being passed to another function.
3147 In that case, unwrap both types so that we can compare the
3148 underlying records. */
3149 if (TREE_CODE (have_va_type
) == ARRAY_TYPE
3150 || TREE_CODE (have_va_type
) == POINTER_TYPE
)
3152 want_va_type
= TREE_TYPE (want_va_type
);
3153 have_va_type
= TREE_TYPE (have_va_type
);
3156 if (TYPE_MAIN_VARIANT (want_va_type
) != TYPE_MAIN_VARIANT (have_va_type
))
3158 error ("first argument to `va_arg' not of type `va_list'");
3162 /* Generate a diagnostic for requesting data of a type that cannot
3163 be passed through `...' due to type promotion at the call site. */
3164 else if ((promoted_type
= (*lang_hooks
.types
.type_promotes_to
) (type
))
3167 const char *name
= "<anonymous type>", *pname
= 0;
3168 static bool gave_help
;
3170 if (TYPE_NAME (type
))
3172 if (TREE_CODE (TYPE_NAME (type
)) == IDENTIFIER_NODE
)
3173 name
= IDENTIFIER_POINTER (TYPE_NAME (type
));
3174 else if (TREE_CODE (TYPE_NAME (type
)) == TYPE_DECL
3175 && DECL_NAME (TYPE_NAME (type
)))
3176 name
= IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type
)));
3178 if (TYPE_NAME (promoted_type
))
3180 if (TREE_CODE (TYPE_NAME (promoted_type
)) == IDENTIFIER_NODE
)
3181 pname
= IDENTIFIER_POINTER (TYPE_NAME (promoted_type
));
3182 else if (TREE_CODE (TYPE_NAME (promoted_type
)) == TYPE_DECL
3183 && DECL_NAME (TYPE_NAME (promoted_type
)))
3184 pname
= IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (promoted_type
)));
3187 /* Unfortunately, this is merely undefined, rather than a constraint
3188 violation, so we cannot make this an error. If this call is never
3189 executed, the program is still strictly conforming. */
3190 warning ("`%s' is promoted to `%s' when passed through `...'",
3195 warning ("(so you should pass `%s' not `%s' to `va_arg')",
3199 /* We can, however, treat "undefined" any way we please.
3200 Call abort to encourage the user to fix the program. */
3201 expand_builtin_trap ();
3203 /* This is dead code, but go ahead and finish so that the
3204 mode of the result comes out right. */
3209 /* Make it easier for the backends by protecting the valist argument
3210 from multiple evaluations. */
3211 valist
= stabilize_va_list (valist
, 0);
3213 #ifdef EXPAND_BUILTIN_VA_ARG
3214 addr
= EXPAND_BUILTIN_VA_ARG (valist
, type
);
3216 addr
= std_expand_builtin_va_arg (valist
, type
);
3220 #ifdef POINTERS_EXTEND_UNSIGNED
3221 if (GET_MODE (addr
) != Pmode
)
3222 addr
= convert_memory_address (Pmode
, addr
);
3225 result
= gen_rtx_MEM (TYPE_MODE (type
), addr
);
3226 set_mem_alias_set (result
, get_varargs_alias_set ());
3231 /* Expand ARGLIST, from a call to __builtin_va_end. */
3234 expand_builtin_va_end (arglist
)
3237 tree valist
= TREE_VALUE (arglist
);
3239 #ifdef EXPAND_BUILTIN_VA_END
3240 valist
= stabilize_va_list (valist
, 0);
3241 EXPAND_BUILTIN_VA_END(arglist
);
3243 /* Evaluate for side effects, if needed. I hate macros that don't
3245 if (TREE_SIDE_EFFECTS (valist
))
3246 expand_expr (valist
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
3252 /* Expand ARGLIST, from a call to __builtin_va_copy. We do this as a
3253 builtin rather than just as an assignment in stdarg.h because of the
3254 nastiness of array-type va_list types. */
3257 expand_builtin_va_copy (arglist
)
3262 dst
= TREE_VALUE (arglist
);
3263 src
= TREE_VALUE (TREE_CHAIN (arglist
));
3265 dst
= stabilize_va_list (dst
, 1);
3266 src
= stabilize_va_list (src
, 0);
3268 if (TREE_CODE (va_list_type_node
) != ARRAY_TYPE
)
3270 t
= build (MODIFY_EXPR
, va_list_type_node
, dst
, src
);
3271 TREE_SIDE_EFFECTS (t
) = 1;
3272 expand_expr (t
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
3276 rtx dstb
, srcb
, size
;
3278 /* Evaluate to pointers. */
3279 dstb
= expand_expr (dst
, NULL_RTX
, Pmode
, EXPAND_NORMAL
);
3280 srcb
= expand_expr (src
, NULL_RTX
, Pmode
, EXPAND_NORMAL
);
3281 size
= expand_expr (TYPE_SIZE_UNIT (va_list_type_node
), NULL_RTX
,
3282 VOIDmode
, EXPAND_NORMAL
);
3284 #ifdef POINTERS_EXTEND_UNSIGNED
3285 if (GET_MODE (dstb
) != Pmode
)
3286 dstb
= convert_memory_address (Pmode
, dstb
);
3288 if (GET_MODE (srcb
) != Pmode
)
3289 srcb
= convert_memory_address (Pmode
, srcb
);
3292 /* "Dereference" to BLKmode memories. */
3293 dstb
= gen_rtx_MEM (BLKmode
, dstb
);
3294 set_mem_alias_set (dstb
, get_alias_set (TREE_TYPE (TREE_TYPE (dst
))));
3295 set_mem_align (dstb
, TYPE_ALIGN (va_list_type_node
));
3296 srcb
= gen_rtx_MEM (BLKmode
, srcb
);
3297 set_mem_alias_set (srcb
, get_alias_set (TREE_TYPE (TREE_TYPE (src
))));
3298 set_mem_align (srcb
, TYPE_ALIGN (va_list_type_node
));
3301 emit_block_move (dstb
, srcb
, size
);
3307 /* Expand a call to one of the builtin functions __builtin_frame_address or
3308 __builtin_return_address. */
3311 expand_builtin_frame_address (exp
)
3314 tree fndecl
= TREE_OPERAND (TREE_OPERAND (exp
, 0), 0);
3315 tree arglist
= TREE_OPERAND (exp
, 1);
3317 /* The argument must be a nonnegative integer constant.
3318 It counts the number of frames to scan up the stack.
3319 The value is the return address saved in that frame. */
3321 /* Warning about missing arg was already issued. */
3323 else if (! host_integerp (TREE_VALUE (arglist
), 1))
3325 if (DECL_FUNCTION_CODE (fndecl
) == BUILT_IN_FRAME_ADDRESS
)
3326 error ("invalid arg to `__builtin_frame_address'");
3328 error ("invalid arg to `__builtin_return_address'");
3334 = expand_builtin_return_addr (DECL_FUNCTION_CODE (fndecl
),
3335 tree_low_cst (TREE_VALUE (arglist
), 1),
3336 hard_frame_pointer_rtx
);
3338 /* Some ports cannot access arbitrary stack frames. */
3341 if (DECL_FUNCTION_CODE (fndecl
) == BUILT_IN_FRAME_ADDRESS
)
3342 warning ("unsupported arg to `__builtin_frame_address'");
3344 warning ("unsupported arg to `__builtin_return_address'");
3348 /* For __builtin_frame_address, return what we've got. */
3349 if (DECL_FUNCTION_CODE (fndecl
) == BUILT_IN_FRAME_ADDRESS
)
3352 if (GET_CODE (tem
) != REG
3353 && ! CONSTANT_P (tem
))
3354 tem
= copy_to_mode_reg (Pmode
, tem
);
3359 /* Expand a call to the alloca builtin, with arguments ARGLIST. Return 0 if
3360 we failed and the caller should emit a normal call, otherwise try to get
3361 the result in TARGET, if convenient. */
3364 expand_builtin_alloca (arglist
, target
)
3371 if (!validate_arglist (arglist
, INTEGER_TYPE
, VOID_TYPE
))
3374 /* Compute the argument. */
3375 op0
= expand_expr (TREE_VALUE (arglist
), NULL_RTX
, VOIDmode
, 0);
3377 /* Allocate the desired space. */
3378 result
= allocate_dynamic_stack_space (op0
, target
, BITS_PER_UNIT
);
3380 #ifdef POINTERS_EXTEND_UNSIGNED
3381 if (GET_MODE (result
) != ptr_mode
)
3382 result
= convert_memory_address (ptr_mode
, result
);
3388 /* Expand a call to the ffs builtin. The arguments are in ARGLIST.
3389 Return 0 if a normal call should be emitted rather than expanding the
3390 function in-line. If convenient, the result should be placed in TARGET.
3391 SUBTARGET may be used as the target for computing one of EXP's operands. */
3394 expand_builtin_ffs (arglist
, target
, subtarget
)
3396 rtx target
, subtarget
;
3399 if (!validate_arglist (arglist
, INTEGER_TYPE
, VOID_TYPE
))
3402 /* Compute the argument. */
3403 op0
= expand_expr (TREE_VALUE (arglist
), subtarget
, VOIDmode
, 0);
3404 /* Compute ffs, into TARGET if possible.
3405 Set TARGET to wherever the result comes back. */
3406 target
= expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist
))),
3407 ffs_optab
, op0
, target
, 1);
3413 /* If the string passed to fputs is a constant and is one character
3414 long, we attempt to transform this call into __builtin_fputc(). */
3417 expand_builtin_fputs (arglist
, ignore
, unlocked
)
3423 tree fn_fputc
= unlocked
? built_in_decls
[BUILT_IN_FPUTC_UNLOCKED
]
3424 : built_in_decls
[BUILT_IN_FPUTC
];
3425 tree fn_fwrite
= unlocked
? built_in_decls
[BUILT_IN_FWRITE_UNLOCKED
]
3426 : built_in_decls
[BUILT_IN_FWRITE
];
3428 /* If the return value is used, or the replacement _DECL isn't
3429 initialized, don't do the transformation. */
3430 if (!ignore
|| !fn_fputc
|| !fn_fwrite
)
3433 /* Verify the arguments in the original call. */
3434 if (!validate_arglist (arglist
, POINTER_TYPE
, POINTER_TYPE
, VOID_TYPE
))
3437 /* Get the length of the string passed to fputs. If the length
3438 can't be determined, punt. */
3439 if (!(len
= c_strlen (TREE_VALUE (arglist
)))
3440 || TREE_CODE (len
) != INTEGER_CST
)
3443 switch (compare_tree_int (len
, 1))
3445 case -1: /* length is 0, delete the call entirely . */
3447 /* Evaluate and ignore the argument in case it has
3449 expand_expr (TREE_VALUE (TREE_CHAIN (arglist
)), const0_rtx
,
3450 VOIDmode
, EXPAND_NORMAL
);
3453 case 0: /* length is 1, call fputc. */
3455 const char *p
= c_getstr (TREE_VALUE (arglist
));
3459 /* New argument list transforming fputs(string, stream) to
3460 fputc(string[0], stream). */
3462 build_tree_list (NULL_TREE
, TREE_VALUE (TREE_CHAIN (arglist
)));
3464 tree_cons (NULL_TREE
, build_int_2 (p
[0], 0), arglist
);
3470 case 1: /* length is greater than 1, call fwrite. */
3472 tree string_arg
= TREE_VALUE (arglist
);
3474 /* New argument list transforming fputs(string, stream) to
3475 fwrite(string, 1, len, stream). */
3476 arglist
= build_tree_list (NULL_TREE
, TREE_VALUE (TREE_CHAIN (arglist
)));
3477 arglist
= tree_cons (NULL_TREE
, len
, arglist
);
3478 arglist
= tree_cons (NULL_TREE
, size_one_node
, arglist
);
3479 arglist
= tree_cons (NULL_TREE
, string_arg
, arglist
);
3487 return expand_expr (build_function_call_expr (fn
, arglist
),
3488 (ignore
? const0_rtx
: NULL_RTX
),
3489 VOIDmode
, EXPAND_NORMAL
);
3492 /* Expand a call to __builtin_expect. We return our argument and emit a
3493 NOTE_INSN_EXPECTED_VALUE note. This is the expansion of __builtin_expect in
3494 a non-jump context. */
3497 expand_builtin_expect (arglist
, target
)
3504 if (arglist
== NULL_TREE
3505 || TREE_CHAIN (arglist
) == NULL_TREE
)
3507 exp
= TREE_VALUE (arglist
);
3508 c
= TREE_VALUE (TREE_CHAIN (arglist
));
3510 if (TREE_CODE (c
) != INTEGER_CST
)
3512 error ("second arg to `__builtin_expect' must be a constant");
3513 c
= integer_zero_node
;
3516 target
= expand_expr (exp
, target
, VOIDmode
, EXPAND_NORMAL
);
3518 /* Don't bother with expected value notes for integral constants. */
3519 if (GET_CODE (target
) != CONST_INT
)
3521 /* We do need to force this into a register so that we can be
3522 moderately sure to be able to correctly interpret the branch
3524 target
= force_reg (GET_MODE (target
), target
);
3526 rtx_c
= expand_expr (c
, NULL_RTX
, GET_MODE (target
), EXPAND_NORMAL
);
3528 note
= emit_note (NULL
, NOTE_INSN_EXPECTED_VALUE
);
3529 NOTE_EXPECTED_VALUE (note
) = gen_rtx_EQ (VOIDmode
, target
, rtx_c
);
3535 /* Like expand_builtin_expect, except do this in a jump context. This is
3536 called from do_jump if the conditional is a __builtin_expect. Return either
3537 a list of insns to emit the jump or NULL if we cannot optimize
3538 __builtin_expect. We need to optimize this at jump time so that machines
3539 like the PowerPC don't turn the test into a SCC operation, and then jump
3540 based on the test being 0/1. */
3543 expand_builtin_expect_jump (exp
, if_false_label
, if_true_label
)
3548 tree arglist
= TREE_OPERAND (exp
, 1);
3549 tree arg0
= TREE_VALUE (arglist
);
3550 tree arg1
= TREE_VALUE (TREE_CHAIN (arglist
));
3553 /* Only handle __builtin_expect (test, 0) and
3554 __builtin_expect (test, 1). */
3555 if (TREE_CODE (TREE_TYPE (arg1
)) == INTEGER_TYPE
3556 && (integer_zerop (arg1
) || integer_onep (arg1
)))
3561 /* If we fail to locate an appropriate conditional jump, we'll
3562 fall back to normal evaluation. Ensure that the expression
3563 can be re-evaluated. */
3564 switch (unsafe_for_reeval (arg0
))
3569 case 1: /* Mildly unsafe. */
3570 arg0
= unsave_expr (arg0
);
3573 case 2: /* Wildly unsafe. */
3577 /* Expand the jump insns. */
3579 do_jump (arg0
, if_false_label
, if_true_label
);
3583 /* Now that the __builtin_expect has been validated, go through and add
3584 the expect's to each of the conditional jumps. If we run into an
3585 error, just give up and generate the 'safe' code of doing a SCC
3586 operation and then doing a branch on that. */
3588 while (insn
!= NULL_RTX
)
3590 rtx next
= NEXT_INSN (insn
);
3593 if (GET_CODE (insn
) == JUMP_INSN
&& any_condjump_p (insn
)
3594 && (pattern
= pc_set (insn
)) != NULL_RTX
)
3596 rtx ifelse
= SET_SRC (pattern
);
3600 if (GET_CODE (ifelse
) != IF_THEN_ELSE
)
3603 if (GET_CODE (XEXP (ifelse
, 1)) == LABEL_REF
)
3606 label
= XEXP (XEXP (ifelse
, 1), 0);
3608 /* An inverted jump reverses the probabilities. */
3609 else if (GET_CODE (XEXP (ifelse
, 2)) == LABEL_REF
)
3612 label
= XEXP (XEXP (ifelse
, 2), 0);
3614 /* We shouldn't have to worry about conditional returns during
3615 the expansion stage, but handle it gracefully anyway. */
3616 else if (GET_CODE (XEXP (ifelse
, 1)) == RETURN
)
3621 /* An inverted return reverses the probabilities. */
3622 else if (GET_CODE (XEXP (ifelse
, 2)) == RETURN
)
3630 /* If the test is expected to fail, reverse the
3632 if (integer_zerop (arg1
))
3635 /* If we are jumping to the false label, reverse the
3637 if (label
== NULL_RTX
)
3638 ; /* conditional return */
3639 else if (label
== if_false_label
)
3641 else if (label
!= if_true_label
)
3645 predict_insn_def (insn
, PRED_BUILTIN_EXPECT
, taken
);
3652 /* If no jumps were modified, fail and do __builtin_expect the normal
3662 expand_builtin_trap ()
3666 emit_insn (gen_trap ());
3669 emit_library_call (abort_libfunc
, LCT_NORETURN
, VOIDmode
, 0);
3673 /* Expand an expression EXP that calls a built-in function,
3674 with result going to TARGET if that's convenient
3675 (and in mode MODE if that's convenient).
3676 SUBTARGET may be used as the target for computing one of EXP's operands.
3677 IGNORE is nonzero if the value is to be ignored. */
3680 expand_builtin (exp
, target
, subtarget
, mode
, ignore
)
3684 enum machine_mode mode
;
3687 tree fndecl
= TREE_OPERAND (TREE_OPERAND (exp
, 0), 0);
3688 tree arglist
= TREE_OPERAND (exp
, 1);
3689 enum built_in_function fcode
= DECL_FUNCTION_CODE (fndecl
);
3691 if (DECL_BUILT_IN_CLASS (fndecl
) == BUILT_IN_MD
)
3692 return (*targetm
.expand_builtin
) (exp
, target
, subtarget
, mode
, ignore
);
3694 /* When not optimizing, generate calls to library functions for a certain
3696 if (!optimize
&& !CALLED_AS_BUILT_IN (fndecl
))
3700 case BUILT_IN_SQRTF
:
3701 case BUILT_IN_SQRTL
:
3711 case BUILT_IN_MEMSET
:
3712 case BUILT_IN_MEMCPY
:
3713 case BUILT_IN_MEMCMP
:
3715 case BUILT_IN_BZERO
:
3716 case BUILT_IN_INDEX
:
3717 case BUILT_IN_RINDEX
:
3718 case BUILT_IN_STRCHR
:
3719 case BUILT_IN_STRRCHR
:
3720 case BUILT_IN_STRLEN
:
3721 case BUILT_IN_STRCPY
:
3722 case BUILT_IN_STRNCPY
:
3723 case BUILT_IN_STRNCMP
:
3724 case BUILT_IN_STRSTR
:
3725 case BUILT_IN_STRPBRK
:
3726 case BUILT_IN_STRCAT
:
3727 case BUILT_IN_STRNCAT
:
3728 case BUILT_IN_STRSPN
:
3729 case BUILT_IN_STRCSPN
:
3730 case BUILT_IN_STRCMP
:
3732 case BUILT_IN_PUTCHAR
:
3734 case BUILT_IN_PRINTF
:
3735 case BUILT_IN_FPUTC
:
3736 case BUILT_IN_FPUTS
:
3737 case BUILT_IN_FWRITE
:
3738 case BUILT_IN_PUTCHAR_UNLOCKED
:
3739 case BUILT_IN_PUTS_UNLOCKED
:
3740 case BUILT_IN_PRINTF_UNLOCKED
:
3741 case BUILT_IN_FPUTC_UNLOCKED
:
3742 case BUILT_IN_FPUTS_UNLOCKED
:
3743 case BUILT_IN_FWRITE_UNLOCKED
:
3744 return expand_call (exp
, target
, ignore
);
3754 case BUILT_IN_LLABS
:
3755 case BUILT_IN_IMAXABS
:
3757 case BUILT_IN_FABSF
:
3758 case BUILT_IN_FABSL
:
3759 /* build_function_call changes these into ABS_EXPR. */
3763 case BUILT_IN_CONJF
:
3764 case BUILT_IN_CONJL
:
3765 case BUILT_IN_CREAL
:
3766 case BUILT_IN_CREALF
:
3767 case BUILT_IN_CREALL
:
3768 case BUILT_IN_CIMAG
:
3769 case BUILT_IN_CIMAGF
:
3770 case BUILT_IN_CIMAGL
:
3771 /* expand_tree_builtin changes these into CONJ_EXPR, REALPART_EXPR
3772 and IMAGPART_EXPR. */
3787 /* Treat these like sqrt only if unsafe math optimizations are allowed,
3788 because of possible accuracy problems. */
3789 if (! flag_unsafe_math_optimizations
)
3792 case BUILT_IN_SQRTF
:
3793 case BUILT_IN_SQRTL
:
3794 target
= expand_builtin_mathfn (exp
, target
, subtarget
);
3799 case BUILT_IN_APPLY_ARGS
:
3800 return expand_builtin_apply_args ();
3802 /* __builtin_apply (FUNCTION, ARGUMENTS, ARGSIZE) invokes
3803 FUNCTION with a copy of the parameters described by
3804 ARGUMENTS, and ARGSIZE. It returns a block of memory
3805 allocated on the stack into which is stored all the registers
3806 that might possibly be used for returning the result of a
3807 function. ARGUMENTS is the value returned by
3808 __builtin_apply_args. ARGSIZE is the number of bytes of
3809 arguments that must be copied. ??? How should this value be
3810 computed? We'll also need a safe worst case value for varargs
3812 case BUILT_IN_APPLY
:
3813 if (!validate_arglist (arglist
, POINTER_TYPE
,
3814 POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
)
3815 && !validate_arglist (arglist
, REFERENCE_TYPE
,
3816 POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
3824 for (t
= arglist
, i
= 0; t
; t
= TREE_CHAIN (t
), i
++)
3825 ops
[i
] = expand_expr (TREE_VALUE (t
), NULL_RTX
, VOIDmode
, 0);
3827 return expand_builtin_apply (ops
[0], ops
[1], ops
[2]);
3830 /* __builtin_return (RESULT) causes the function to return the
3831 value described by RESULT. RESULT is address of the block of
3832 memory returned by __builtin_apply. */
3833 case BUILT_IN_RETURN
:
3834 if (validate_arglist (arglist
, POINTER_TYPE
, VOID_TYPE
))
3835 expand_builtin_return (expand_expr (TREE_VALUE (arglist
),
3836 NULL_RTX
, VOIDmode
, 0));
3839 case BUILT_IN_SAVEREGS
:
3840 return expand_builtin_saveregs ();
3842 case BUILT_IN_ARGS_INFO
:
3843 return expand_builtin_args_info (exp
);
3845 /* Return the address of the first anonymous stack arg. */
3846 case BUILT_IN_NEXT_ARG
:
3847 return expand_builtin_next_arg (arglist
);
3849 case BUILT_IN_CLASSIFY_TYPE
:
3850 return expand_builtin_classify_type (arglist
);
3852 case BUILT_IN_CONSTANT_P
:
3853 return expand_builtin_constant_p (exp
);
3855 case BUILT_IN_FRAME_ADDRESS
:
3856 case BUILT_IN_RETURN_ADDRESS
:
3857 return expand_builtin_frame_address (exp
);
3859 /* Returns the address of the area where the structure is returned.
3861 case BUILT_IN_AGGREGATE_INCOMING_ADDRESS
:
3863 || ! AGGREGATE_TYPE_P (TREE_TYPE (TREE_TYPE (current_function_decl
)))
3864 || GET_CODE (DECL_RTL (DECL_RESULT (current_function_decl
))) != MEM
)
3867 return XEXP (DECL_RTL (DECL_RESULT (current_function_decl
)), 0);
3869 case BUILT_IN_ALLOCA
:
3870 target
= expand_builtin_alloca (arglist
, target
);
3876 target
= expand_builtin_ffs (arglist
, target
, subtarget
);
3881 case BUILT_IN_STRLEN
:
3882 target
= expand_builtin_strlen (exp
, target
);
3887 case BUILT_IN_STRCPY
:
3888 target
= expand_builtin_strcpy (exp
, target
, mode
);
3893 case BUILT_IN_STRNCPY
:
3894 target
= expand_builtin_strncpy (arglist
, target
, mode
);
3899 case BUILT_IN_STRCAT
:
3900 target
= expand_builtin_strcat (arglist
, target
, mode
);
3905 case BUILT_IN_STRNCAT
:
3906 target
= expand_builtin_strncat (arglist
, target
, mode
);
3911 case BUILT_IN_STRSPN
:
3912 target
= expand_builtin_strspn (arglist
, target
, mode
);
3917 case BUILT_IN_STRCSPN
:
3918 target
= expand_builtin_strcspn (arglist
, target
, mode
);
3923 case BUILT_IN_STRSTR
:
3924 target
= expand_builtin_strstr (arglist
, target
, mode
);
3929 case BUILT_IN_STRPBRK
:
3930 target
= expand_builtin_strpbrk (arglist
, target
, mode
);
3935 case BUILT_IN_INDEX
:
3936 case BUILT_IN_STRCHR
:
3937 target
= expand_builtin_strchr (arglist
, target
, mode
);
3942 case BUILT_IN_RINDEX
:
3943 case BUILT_IN_STRRCHR
:
3944 target
= expand_builtin_strrchr (arglist
, target
, mode
);
3949 case BUILT_IN_MEMCPY
:
3950 target
= expand_builtin_memcpy (arglist
, target
, mode
);
3955 case BUILT_IN_MEMSET
:
3956 target
= expand_builtin_memset (exp
, target
, mode
);
3961 case BUILT_IN_BZERO
:
3962 target
= expand_builtin_bzero (exp
);
3967 case BUILT_IN_STRCMP
:
3968 target
= expand_builtin_strcmp (exp
, target
, mode
);
3973 case BUILT_IN_STRNCMP
:
3974 target
= expand_builtin_strncmp (exp
, target
, mode
);
3980 case BUILT_IN_MEMCMP
:
3981 target
= expand_builtin_memcmp (exp
, arglist
, target
, mode
);
3986 case BUILT_IN_SETJMP
:
3987 target
= expand_builtin_setjmp (arglist
, target
);
3992 /* __builtin_longjmp is passed a pointer to an array of five words.
3993 It's similar to the C library longjmp function but works with
3994 __builtin_setjmp above. */
3995 case BUILT_IN_LONGJMP
:
3996 if (!validate_arglist (arglist
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
4000 rtx buf_addr
= expand_expr (TREE_VALUE (arglist
), subtarget
,
4002 rtx value
= expand_expr (TREE_VALUE (TREE_CHAIN (arglist
)),
4003 NULL_RTX
, VOIDmode
, 0);
4005 if (value
!= const1_rtx
)
4007 error ("__builtin_longjmp second argument must be 1");
4011 expand_builtin_longjmp (buf_addr
, value
);
4016 expand_builtin_trap ();
4019 case BUILT_IN_FPUTS
:
4020 target
= expand_builtin_fputs (arglist
, ignore
,/*unlocked=*/ 0);
4024 case BUILT_IN_FPUTS_UNLOCKED
:
4025 target
= expand_builtin_fputs (arglist
, ignore
,/*unlocked=*/ 1);
4030 /* Various hooks for the DWARF 2 __throw routine. */
4031 case BUILT_IN_UNWIND_INIT
:
4032 expand_builtin_unwind_init ();
4034 case BUILT_IN_DWARF_CFA
:
4035 return virtual_cfa_rtx
;
4036 #ifdef DWARF2_UNWIND_INFO
4037 case BUILT_IN_DWARF_FP_REGNUM
:
4038 return expand_builtin_dwarf_fp_regnum ();
4039 case BUILT_IN_INIT_DWARF_REG_SIZES
:
4040 expand_builtin_init_dwarf_reg_sizes (TREE_VALUE (arglist
));
4043 case BUILT_IN_FROB_RETURN_ADDR
:
4044 return expand_builtin_frob_return_addr (TREE_VALUE (arglist
));
4045 case BUILT_IN_EXTRACT_RETURN_ADDR
:
4046 return expand_builtin_extract_return_addr (TREE_VALUE (arglist
));
4047 case BUILT_IN_EH_RETURN
:
4048 expand_builtin_eh_return (TREE_VALUE (arglist
),
4049 TREE_VALUE (TREE_CHAIN (arglist
)));
4051 #ifdef EH_RETURN_DATA_REGNO
4052 case BUILT_IN_EH_RETURN_DATA_REGNO
:
4053 return expand_builtin_eh_return_data_regno (arglist
);
4055 case BUILT_IN_VA_START
:
4056 case BUILT_IN_STDARG_START
:
4057 return expand_builtin_va_start (arglist
);
4058 case BUILT_IN_VA_END
:
4059 return expand_builtin_va_end (arglist
);
4060 case BUILT_IN_VA_COPY
:
4061 return expand_builtin_va_copy (arglist
);
4062 case BUILT_IN_EXPECT
:
4063 return expand_builtin_expect (arglist
, target
);
4064 case BUILT_IN_PREFETCH
:
4065 expand_builtin_prefetch (arglist
);
4069 default: /* just do library call, if unknown builtin */
4070 if (!DECL_ASSEMBLER_NAME_SET_P (fndecl
))
4071 error ("built-in function `%s' not currently supported",
4072 IDENTIFIER_POINTER (DECL_NAME (fndecl
)));
4075 /* The switch statement above can drop through to cause the function
4076 to be called normally. */
4077 return expand_call (exp
, target
, ignore
);
4080 /* Fold a call to __builtin_constant_p, if we know it will evaluate to a
4081 constant. ARGLIST is the argument list of the call. */
4084 fold_builtin_constant_p (arglist
)
4090 arglist
= TREE_VALUE (arglist
);
4092 /* We return 1 for a numeric type that's known to be a constant
4093 value at compile-time or for an aggregate type that's a
4094 literal constant. */
4095 STRIP_NOPS (arglist
);
4097 /* If we know this is a constant, emit the constant of one. */
4098 if (TREE_CODE_CLASS (TREE_CODE (arglist
)) == 'c'
4099 || (TREE_CODE (arglist
) == CONSTRUCTOR
4100 && TREE_CONSTANT (arglist
))
4101 || (TREE_CODE (arglist
) == ADDR_EXPR
4102 && TREE_CODE (TREE_OPERAND (arglist
, 0)) == STRING_CST
))
4103 return integer_one_node
;
4105 /* If we aren't going to be running CSE or this expression
4106 has side effects, show we don't know it to be a constant.
4107 Likewise if it's a pointer or aggregate type since in those
4108 case we only want literals, since those are only optimized
4109 when generating RTL, not later.
4110 And finally, if we are compiling an initializer, not code, we
4111 need to return a definite result now; there's not going to be any
4112 more optimization done. */
4113 if (TREE_SIDE_EFFECTS (arglist
) || cse_not_expected
4114 || AGGREGATE_TYPE_P (TREE_TYPE (arglist
))
4115 || POINTER_TYPE_P (TREE_TYPE (arglist
))
4117 return integer_zero_node
;
4122 /* Fold a call to __builtin_classify_type. */
4125 fold_builtin_classify_type (arglist
)
4129 return build_int_2 (no_type_class
, 0);
4131 return build_int_2 (type_to_class (TREE_TYPE (TREE_VALUE (arglist
))), 0);
4134 /* Used by constant folding to eliminate some builtin calls early. EXP is
4135 the CALL_EXPR of a call to a builtin function. */
4141 tree fndecl
= TREE_OPERAND (TREE_OPERAND (exp
, 0), 0);
4142 tree arglist
= TREE_OPERAND (exp
, 1);
4143 enum built_in_function fcode
= DECL_FUNCTION_CODE (fndecl
);
4145 if (DECL_BUILT_IN_CLASS (fndecl
) == BUILT_IN_MD
)
4150 case BUILT_IN_CONSTANT_P
:
4151 return fold_builtin_constant_p (arglist
);
4153 case BUILT_IN_CLASSIFY_TYPE
:
4154 return fold_builtin_classify_type (arglist
);
4156 case BUILT_IN_STRLEN
:
4157 if (validate_arglist (arglist
, POINTER_TYPE
, VOID_TYPE
))
4159 tree len
= c_strlen (TREE_VALUE (arglist
));
4173 build_function_call_expr (fn
, arglist
)
4178 call_expr
= build1 (ADDR_EXPR
, build_pointer_type (TREE_TYPE (fn
)), fn
);
4179 call_expr
= build (CALL_EXPR
, TREE_TYPE (TREE_TYPE (fn
)),
4180 call_expr
, arglist
);
4181 TREE_SIDE_EFFECTS (call_expr
) = 1;
4182 return fold (call_expr
);
4185 /* This function validates the types of a function call argument list
4186 represented as a tree chain of parameters against a specified list
4187 of tree_codes. If the last specifier is a 0, that represents an
4188 ellipses, otherwise the last specifier must be a VOID_TYPE. */
4191 validate_arglist
VPARAMS ((tree arglist
, ...))
4193 enum tree_code code
;
4196 VA_OPEN (ap
, arglist
);
4197 VA_FIXEDARG (ap
, tree
, arglist
);
4200 code
= va_arg (ap
, enum tree_code
);
4204 /* This signifies an ellipses, any further arguments are all ok. */
4208 /* This signifies an endlink, if no arguments remain, return
4209 true, otherwise return false. */
4213 /* If no parameters remain or the parameter's code does not
4214 match the specified code, return false. Otherwise continue
4215 checking any remaining arguments. */
4216 if (arglist
== 0 || code
!= TREE_CODE (TREE_TYPE (TREE_VALUE (arglist
))))
4220 arglist
= TREE_CHAIN (arglist
);
4223 /* We need gotos here since we can only have one VA_CLOSE in a
4231 /* Default version of target-specific builtin setup that does nothing. */
4234 default_init_builtins ()
4238 /* Default target-specific builtin expander that does nothing. */
4241 default_expand_builtin (exp
, target
, subtarget
, mode
, ignore
)
4242 tree exp ATTRIBUTE_UNUSED
;
4243 rtx target ATTRIBUTE_UNUSED
;
4244 rtx subtarget ATTRIBUTE_UNUSED
;
4245 enum machine_mode mode ATTRIBUTE_UNUSED
;
4246 int ignore ATTRIBUTE_UNUSED
;