1 /* Expand builtin functions.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
30 #include "hard-reg-set.h"
33 #include "insn-config.h"
39 #include "typeclass.h"
45 #define CALLED_AS_BUILT_IN(NODE) \
46 (!strncmp (IDENTIFIER_POINTER (DECL_NAME (NODE)), "__builtin_", 10))
48 /* Register mappings for target machines without register windows. */
49 #ifndef INCOMING_REGNO
50 #define INCOMING_REGNO(OUT) (OUT)
52 #ifndef OUTGOING_REGNO
53 #define OUTGOING_REGNO(IN) (IN)
56 #ifndef PAD_VARARGS_DOWN
57 #define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
60 /* Define the names of the builtin function types and codes. */
61 const char *const built_in_class_names
[4]
62 = {"NOT_BUILT_IN", "BUILT_IN_FRONTEND", "BUILT_IN_MD", "BUILT_IN_NORMAL"};
64 #define DEF_BUILTIN(X, N, C, T, LT, B, F, NA) STRINGX(X),
65 const char *const built_in_names
[(int) END_BUILTINS
] =
67 #include "builtins.def"
71 /* Setup an array of _DECL trees, make sure each element is
72 initialized to NULL_TREE. */
73 tree built_in_decls
[(int) END_BUILTINS
];
75 tree (*lang_type_promotes_to
) PARAMS ((tree
));
77 static int get_pointer_alignment
PARAMS ((tree
, unsigned int));
78 static tree c_strlen
PARAMS ((tree
));
79 static const char *c_getstr
PARAMS ((tree
));
80 static rtx c_readstr
PARAMS ((const char *,
82 static int target_char_cast
PARAMS ((tree
, char *));
83 static rtx get_memory_rtx
PARAMS ((tree
));
84 static int apply_args_size
PARAMS ((void));
85 static int apply_result_size
PARAMS ((void));
86 #if defined (HAVE_untyped_call) || defined (HAVE_untyped_return)
87 static rtx result_vector
PARAMS ((int, rtx
));
89 static rtx expand_builtin_setjmp
PARAMS ((tree
, rtx
));
90 static 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 ((int, tree
));
101 static rtx expand_builtin_va_end
PARAMS ((tree
));
102 static rtx expand_builtin_va_copy
PARAMS ((tree
));
104 static rtx expand_builtin_memcmp
PARAMS ((tree
, tree
, rtx
));
106 static rtx expand_builtin_strcmp
PARAMS ((tree
, rtx
,
108 static rtx expand_builtin_strncmp
PARAMS ((tree
, rtx
,
110 static rtx builtin_memcpy_read_str
PARAMS ((PTR
, HOST_WIDE_INT
,
112 static rtx expand_builtin_strcat
PARAMS ((tree
, rtx
,
114 static rtx expand_builtin_strncat
PARAMS ((tree
, rtx
,
116 static rtx expand_builtin_strspn
PARAMS ((tree
, rtx
,
118 static rtx expand_builtin_strcspn
PARAMS ((tree
, rtx
,
120 static rtx expand_builtin_memcpy
PARAMS ((tree
));
121 static rtx expand_builtin_strcpy
PARAMS ((tree
));
122 static rtx builtin_strncpy_read_str
PARAMS ((PTR
, HOST_WIDE_INT
,
124 static rtx expand_builtin_strncpy
PARAMS ((tree
, rtx
,
126 static rtx builtin_memset_read_str
PARAMS ((PTR
, HOST_WIDE_INT
,
128 static rtx expand_builtin_memset
PARAMS ((tree
));
129 static rtx expand_builtin_bzero
PARAMS ((tree
));
130 static rtx expand_builtin_strlen
PARAMS ((tree
, rtx
));
131 static rtx expand_builtin_strstr
PARAMS ((tree
, rtx
,
133 static rtx expand_builtin_strpbrk
PARAMS ((tree
, rtx
,
135 static rtx expand_builtin_strchr
PARAMS ((tree
, rtx
,
137 static rtx expand_builtin_strrchr
PARAMS ((tree
, rtx
,
139 static rtx expand_builtin_alloca
PARAMS ((tree
, rtx
));
140 static rtx expand_builtin_ffs
PARAMS ((tree
, rtx
, rtx
));
141 static rtx expand_builtin_frame_address
PARAMS ((tree
));
142 static rtx expand_builtin_fputs
PARAMS ((tree
, int));
143 static tree stabilize_va_list
PARAMS ((tree
, int));
144 static rtx expand_builtin_expect
PARAMS ((tree
, rtx
));
145 static tree fold_builtin_constant_p
PARAMS ((tree
));
146 static tree fold_builtin_classify_type
PARAMS ((tree
));
147 static tree build_function_call_expr
PARAMS ((tree
, tree
));
148 static int validate_arglist
PARAMS ((tree
, ...));
150 /* Return the alignment in bits of EXP, a pointer valued expression.
151 But don't return more than MAX_ALIGN no matter what.
152 The alignment returned is, by default, the alignment of the thing that
153 EXP points to. If it is not a POINTER_TYPE, 0 is returned.
155 Otherwise, look at the expression to see if we can do better, i.e., if the
156 expression is actually pointing at an object whose alignment is tighter. */
159 get_pointer_alignment (exp
, max_align
)
161 unsigned int max_align
;
163 unsigned int align
, inner
;
165 if (TREE_CODE (TREE_TYPE (exp
)) != POINTER_TYPE
)
168 align
= TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp
)));
169 align
= MIN (align
, max_align
);
173 switch (TREE_CODE (exp
))
177 case NON_LVALUE_EXPR
:
178 exp
= TREE_OPERAND (exp
, 0);
179 if (TREE_CODE (TREE_TYPE (exp
)) != POINTER_TYPE
)
182 inner
= TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp
)));
183 align
= MIN (inner
, max_align
);
187 /* If sum of pointer + int, restrict our maximum alignment to that
188 imposed by the integer. If not, we can't do any better than
190 if (! host_integerp (TREE_OPERAND (exp
, 1), 1))
193 while (((tree_low_cst (TREE_OPERAND (exp
, 1), 1))
194 & (max_align
/ BITS_PER_UNIT
- 1))
198 exp
= TREE_OPERAND (exp
, 0);
202 /* See what we are pointing at and look at its alignment. */
203 exp
= TREE_OPERAND (exp
, 0);
204 if (TREE_CODE (exp
) == FUNCTION_DECL
)
205 align
= FUNCTION_BOUNDARY
;
206 else if (DECL_P (exp
))
207 align
= DECL_ALIGN (exp
);
208 #ifdef CONSTANT_ALIGNMENT
209 else if (TREE_CODE_CLASS (TREE_CODE (exp
)) == 'c')
210 align
= CONSTANT_ALIGNMENT (exp
, align
);
212 return MIN (align
, max_align
);
220 /* Compute the length of a C string. TREE_STRING_LENGTH is not the right
221 way, because it could contain a zero byte in the middle.
222 TREE_STRING_LENGTH is the size of the character array, not the string.
224 The value returned is of type `ssizetype'.
226 Unfortunately, string_constant can't access the values of const char
227 arrays with initializers, so neither can we do so here. */
234 HOST_WIDE_INT offset
;
238 src
= string_constant (src
, &offset_node
);
242 max
= TREE_STRING_LENGTH (src
) - 1;
243 ptr
= TREE_STRING_POINTER (src
);
245 if (offset_node
&& TREE_CODE (offset_node
) != INTEGER_CST
)
247 /* If the string has an internal zero byte (e.g., "foo\0bar"), we can't
248 compute the offset to the following null if we don't know where to
249 start searching for it. */
252 for (i
= 0; i
< max
; i
++)
256 /* We don't know the starting offset, but we do know that the string
257 has no internal zero bytes. We can assume that the offset falls
258 within the bounds of the string; otherwise, the programmer deserves
259 what he gets. Subtract the offset from the length of the string,
260 and return that. This would perhaps not be valid if we were dealing
261 with named arrays in addition to literal string constants. */
263 return size_diffop (size_int (max
), offset_node
);
266 /* We have a known offset into the string. Start searching there for
267 a null character if we can represent it as a single HOST_WIDE_INT. */
268 if (offset_node
== 0)
270 else if (! host_integerp (offset_node
, 0))
273 offset
= tree_low_cst (offset_node
, 0);
275 /* If the offset is known to be out of bounds, warn, and call strlen at
277 if (offset
< 0 || offset
> max
)
279 warning ("offset outside bounds of constant string");
283 /* Use strlen to search for the first zero byte. Since any strings
284 constructed with build_string will have nulls appended, we win even
285 if we get handed something like (char[4])"abcd".
287 Since OFFSET is our starting index into the string, no further
288 calculation is needed. */
289 return ssize_int (strlen (ptr
+ offset
));
292 /* Return a char pointer for a C string if it is a string constant
293 or sum of string constant and integer constant. */
301 src
= string_constant (src
, &offset_node
);
305 if (offset_node
== 0)
306 return TREE_STRING_POINTER (src
);
307 else if (!host_integerp (offset_node
, 1)
308 || compare_tree_int (offset_node
, TREE_STRING_LENGTH (src
) - 1) > 0)
311 return TREE_STRING_POINTER (src
) + tree_low_cst (offset_node
, 1);
314 /* Return a CONST_INT or CONST_DOUBLE corresponding to target reading
315 GET_MODE_BITSIZE (MODE) bits from string constant STR. */
318 c_readstr (str
, mode
)
320 enum machine_mode mode
;
326 if (GET_MODE_CLASS (mode
) != MODE_INT
)
331 for (i
= 0; i
< GET_MODE_SIZE (mode
); i
++)
334 if (WORDS_BIG_ENDIAN
)
335 j
= GET_MODE_SIZE (mode
) - i
- 1;
336 if (BYTES_BIG_ENDIAN
!= WORDS_BIG_ENDIAN
337 && GET_MODE_SIZE (mode
) > UNITS_PER_WORD
)
338 j
= j
+ UNITS_PER_WORD
- 2 * (j
% UNITS_PER_WORD
) - 1;
340 if (j
> 2 * HOST_BITS_PER_WIDE_INT
)
343 ch
= (unsigned char) str
[i
];
344 c
[j
/ HOST_BITS_PER_WIDE_INT
] |= ch
<< (j
% HOST_BITS_PER_WIDE_INT
);
346 return immed_double_const (c
[0], c
[1], mode
);
349 /* Cast a target constant CST to target CHAR and if that value fits into
350 host char type, return zero and put that value into variable pointed by
354 target_char_cast (cst
, p
)
358 unsigned HOST_WIDE_INT val
, hostval
;
360 if (!host_integerp (cst
, 1)
361 || CHAR_TYPE_SIZE
> HOST_BITS_PER_WIDE_INT
)
364 val
= tree_low_cst (cst
, 1);
365 if (CHAR_TYPE_SIZE
< HOST_BITS_PER_WIDE_INT
)
366 val
&= (((unsigned HOST_WIDE_INT
) 1) << CHAR_TYPE_SIZE
) - 1;
369 if (HOST_BITS_PER_CHAR
< HOST_BITS_PER_WIDE_INT
)
370 hostval
&= (((unsigned HOST_WIDE_INT
) 1) << HOST_BITS_PER_CHAR
) - 1;
379 /* Given TEM, a pointer to a stack frame, follow the dynamic chain COUNT
380 times to get the address of either a higher stack frame, or a return
381 address located within it (depending on FNDECL_CODE). */
384 expand_builtin_return_addr (fndecl_code
, count
, tem
)
385 enum built_in_function fndecl_code
;
391 /* Some machines need special handling before we can access
392 arbitrary frames. For example, on the sparc, we must first flush
393 all register windows to the stack. */
394 #ifdef SETUP_FRAME_ADDRESSES
396 SETUP_FRAME_ADDRESSES ();
399 /* On the sparc, the return address is not in the frame, it is in a
400 register. There is no way to access it off of the current frame
401 pointer, but it can be accessed off the previous frame pointer by
402 reading the value from the register window save area. */
403 #ifdef RETURN_ADDR_IN_PREVIOUS_FRAME
404 if (fndecl_code
== BUILT_IN_RETURN_ADDRESS
)
408 /* Scan back COUNT frames to the specified frame. */
409 for (i
= 0; i
< count
; i
++)
411 /* Assume the dynamic chain pointer is in the word that the
412 frame address points to, unless otherwise specified. */
413 #ifdef DYNAMIC_CHAIN_ADDRESS
414 tem
= DYNAMIC_CHAIN_ADDRESS (tem
);
416 tem
= memory_address (Pmode
, tem
);
417 tem
= gen_rtx_MEM (Pmode
, tem
);
418 set_mem_alias_set (tem
, get_frame_alias_set ());
419 tem
= copy_to_reg (tem
);
422 /* For __builtin_frame_address, return what we've got. */
423 if (fndecl_code
== BUILT_IN_FRAME_ADDRESS
)
426 /* For __builtin_return_address, Get the return address from that
428 #ifdef RETURN_ADDR_RTX
429 tem
= RETURN_ADDR_RTX (count
, tem
);
431 tem
= memory_address (Pmode
,
432 plus_constant (tem
, GET_MODE_SIZE (Pmode
)));
433 tem
= gen_rtx_MEM (Pmode
, tem
);
434 set_mem_alias_set (tem
, get_frame_alias_set ());
439 /* Alias set used for setjmp buffer. */
440 static HOST_WIDE_INT setjmp_alias_set
= -1;
442 /* Construct the leading half of a __builtin_setjmp call. Control will
443 return to RECEIVER_LABEL. This is used directly by sjlj exception
447 expand_builtin_setjmp_setup (buf_addr
, receiver_label
)
451 enum machine_mode sa_mode
= STACK_SAVEAREA_MODE (SAVE_NONLOCAL
);
455 if (setjmp_alias_set
== -1)
456 setjmp_alias_set
= new_alias_set ();
458 #ifdef POINTERS_EXTEND_UNSIGNED
459 if (GET_MODE (buf_addr
) != Pmode
)
460 buf_addr
= convert_memory_address (Pmode
, buf_addr
);
463 buf_addr
= force_reg (Pmode
, force_operand (buf_addr
, NULL_RTX
));
467 /* We store the frame pointer and the address of receiver_label in
468 the buffer and use the rest of it for the stack save area, which
469 is machine-dependent. */
471 #ifndef BUILTIN_SETJMP_FRAME_VALUE
472 #define BUILTIN_SETJMP_FRAME_VALUE virtual_stack_vars_rtx
475 mem
= gen_rtx_MEM (Pmode
, buf_addr
);
476 set_mem_alias_set (mem
, setjmp_alias_set
);
477 emit_move_insn (mem
, BUILTIN_SETJMP_FRAME_VALUE
);
479 mem
= gen_rtx_MEM (Pmode
, plus_constant (buf_addr
, GET_MODE_SIZE (Pmode
))),
480 set_mem_alias_set (mem
, setjmp_alias_set
);
482 emit_move_insn (validize_mem (mem
),
483 force_reg (Pmode
, gen_rtx_LABEL_REF (Pmode
, receiver_label
)));
485 stack_save
= gen_rtx_MEM (sa_mode
,
486 plus_constant (buf_addr
,
487 2 * GET_MODE_SIZE (Pmode
)));
488 set_mem_alias_set (stack_save
, setjmp_alias_set
);
489 emit_stack_save (SAVE_NONLOCAL
, &stack_save
, NULL_RTX
);
491 /* If there is further processing to do, do it. */
492 #ifdef HAVE_builtin_setjmp_setup
493 if (HAVE_builtin_setjmp_setup
)
494 emit_insn (gen_builtin_setjmp_setup (buf_addr
));
497 /* Tell optimize_save_area_alloca that extra work is going to
498 need to go on during alloca. */
499 current_function_calls_setjmp
= 1;
501 /* Set this so all the registers get saved in our frame; we need to be
502 able to copy the saved values for any registers from frames we unwind. */
503 current_function_has_nonlocal_label
= 1;
506 /* Construct the trailing part of a __builtin_setjmp call.
507 This is used directly by sjlj exception handling code. */
510 expand_builtin_setjmp_receiver (receiver_label
)
511 rtx receiver_label ATTRIBUTE_UNUSED
;
513 /* Clobber the FP when we get here, so we have to make sure it's
514 marked as used by this function. */
515 emit_insn (gen_rtx_USE (VOIDmode
, hard_frame_pointer_rtx
));
517 /* Mark the static chain as clobbered here so life information
518 doesn't get messed up for it. */
519 emit_insn (gen_rtx_CLOBBER (VOIDmode
, static_chain_rtx
));
521 /* Now put in the code to restore the frame pointer, and argument
522 pointer, if needed. The code below is from expand_end_bindings
523 in stmt.c; see detailed documentation there. */
524 #ifdef HAVE_nonlocal_goto
525 if (! HAVE_nonlocal_goto
)
527 emit_move_insn (virtual_stack_vars_rtx
, hard_frame_pointer_rtx
);
529 #if ARG_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM
530 if (fixed_regs
[ARG_POINTER_REGNUM
])
532 #ifdef ELIMINABLE_REGS
534 static const struct elims
{const int from
, to
;} elim_regs
[] = ELIMINABLE_REGS
;
536 for (i
= 0; i
< ARRAY_SIZE (elim_regs
); i
++)
537 if (elim_regs
[i
].from
== ARG_POINTER_REGNUM
538 && elim_regs
[i
].to
== HARD_FRAME_POINTER_REGNUM
)
541 if (i
== ARRAY_SIZE (elim_regs
))
544 /* Now restore our arg pointer from the address at which it
545 was saved in our stack frame. */
546 emit_move_insn (virtual_incoming_args_rtx
,
547 copy_to_reg (get_arg_pointer_save_area (cfun
)));
552 #ifdef HAVE_builtin_setjmp_receiver
553 if (HAVE_builtin_setjmp_receiver
)
554 emit_insn (gen_builtin_setjmp_receiver (receiver_label
));
557 #ifdef HAVE_nonlocal_goto_receiver
558 if (HAVE_nonlocal_goto_receiver
)
559 emit_insn (gen_nonlocal_goto_receiver ());
564 /* @@@ This is a kludge. Not all machine descriptions define a blockage
565 insn, but we must not allow the code we just generated to be reordered
566 by scheduling. Specifically, the update of the frame pointer must
567 happen immediately, not later. So emit an ASM_INPUT to act as blockage
569 emit_insn (gen_rtx_ASM_INPUT (VOIDmode
, ""));
572 /* __builtin_setjmp is passed a pointer to an array of five words (not
573 all will be used on all machines). It operates similarly to the C
574 library function of the same name, but is more efficient. Much of
575 the code below (and for longjmp) is copied from the handling of
578 NOTE: This is intended for use by GNAT and the exception handling
579 scheme in the compiler and will only work in the method used by
583 expand_builtin_setjmp (arglist
, target
)
587 rtx buf_addr
, next_lab
, cont_lab
;
589 if (!validate_arglist (arglist
, POINTER_TYPE
, VOID_TYPE
))
592 if (target
== 0 || GET_CODE (target
) != REG
593 || REGNO (target
) < FIRST_PSEUDO_REGISTER
)
594 target
= gen_reg_rtx (TYPE_MODE (integer_type_node
));
596 buf_addr
= expand_expr (TREE_VALUE (arglist
), NULL_RTX
, VOIDmode
, 0);
598 next_lab
= gen_label_rtx ();
599 cont_lab
= gen_label_rtx ();
601 expand_builtin_setjmp_setup (buf_addr
, next_lab
);
603 /* Set TARGET to zero and branch to the continue label. */
604 emit_move_insn (target
, const0_rtx
);
605 emit_jump_insn (gen_jump (cont_lab
));
607 emit_label (next_lab
);
609 expand_builtin_setjmp_receiver (next_lab
);
611 /* Set TARGET to one. */
612 emit_move_insn (target
, const1_rtx
);
613 emit_label (cont_lab
);
615 /* Tell flow about the strange goings on. Putting `next_lab' on
616 `nonlocal_goto_handler_labels' to indicates that function
617 calls may traverse the arc back to this label. */
619 current_function_has_nonlocal_label
= 1;
620 nonlocal_goto_handler_labels
621 = gen_rtx_EXPR_LIST (VOIDmode
, next_lab
, nonlocal_goto_handler_labels
);
626 /* __builtin_longjmp is passed a pointer to an array of five words (not
627 all will be used on all machines). It operates similarly to the C
628 library function of the same name, but is more efficient. Much of
629 the code below is copied from the handling of non-local gotos.
631 NOTE: This is intended for use by GNAT and the exception handling
632 scheme in the compiler and will only work in the method used by
636 expand_builtin_longjmp (buf_addr
, value
)
639 rtx fp
, lab
, stack
, insn
;
640 enum machine_mode sa_mode
= STACK_SAVEAREA_MODE (SAVE_NONLOCAL
);
642 if (setjmp_alias_set
== -1)
643 setjmp_alias_set
= new_alias_set ();
645 #ifdef POINTERS_EXTEND_UNSIGNED
646 if (GET_MODE (buf_addr
) != Pmode
)
647 buf_addr
= convert_memory_address (Pmode
, buf_addr
);
650 buf_addr
= force_reg (Pmode
, buf_addr
);
652 /* We used to store value in static_chain_rtx, but that fails if pointers
653 are smaller than integers. We instead require that the user must pass
654 a second argument of 1, because that is what builtin_setjmp will
655 return. This also makes EH slightly more efficient, since we are no
656 longer copying around a value that we don't care about. */
657 if (value
!= const1_rtx
)
660 current_function_calls_longjmp
= 1;
662 #ifdef HAVE_builtin_longjmp
663 if (HAVE_builtin_longjmp
)
664 emit_insn (gen_builtin_longjmp (buf_addr
));
668 fp
= gen_rtx_MEM (Pmode
, buf_addr
);
669 lab
= gen_rtx_MEM (Pmode
, plus_constant (buf_addr
,
670 GET_MODE_SIZE (Pmode
)));
672 stack
= gen_rtx_MEM (sa_mode
, plus_constant (buf_addr
,
673 2 * GET_MODE_SIZE (Pmode
)));
674 set_mem_alias_set (fp
, setjmp_alias_set
);
675 set_mem_alias_set (lab
, setjmp_alias_set
);
676 set_mem_alias_set (stack
, setjmp_alias_set
);
678 /* Pick up FP, label, and SP from the block and jump. This code is
679 from expand_goto in stmt.c; see there for detailed comments. */
680 #if HAVE_nonlocal_goto
681 if (HAVE_nonlocal_goto
)
682 /* We have to pass a value to the nonlocal_goto pattern that will
683 get copied into the static_chain pointer, but it does not matter
684 what that value is, because builtin_setjmp does not use it. */
685 emit_insn (gen_nonlocal_goto (value
, lab
, stack
, fp
));
689 lab
= copy_to_reg (lab
);
691 emit_move_insn (hard_frame_pointer_rtx
, fp
);
692 emit_stack_restore (SAVE_NONLOCAL
, stack
, NULL_RTX
);
694 emit_insn (gen_rtx_USE (VOIDmode
, hard_frame_pointer_rtx
));
695 emit_insn (gen_rtx_USE (VOIDmode
, stack_pointer_rtx
));
696 emit_indirect_jump (lab
);
700 /* Search backwards and mark the jump insn as a non-local goto.
701 Note that this precludes the use of __builtin_longjmp to a
702 __builtin_setjmp target in the same function. However, we've
703 already cautioned the user that these functions are for
704 internal exception handling use only. */
705 for (insn
= get_last_insn (); insn
; insn
= PREV_INSN (insn
))
707 if (GET_CODE (insn
) == JUMP_INSN
)
709 REG_NOTES (insn
) = alloc_EXPR_LIST (REG_NON_LOCAL_GOTO
, const0_rtx
,
713 else if (GET_CODE (insn
) == CALL_INSN
)
718 /* Get a MEM rtx for expression EXP which is the address of an operand
719 to be used to be used in a string instruction (cmpstrsi, movstrsi, ..). */
725 rtx addr
= expand_expr (exp
, NULL_RTX
, ptr_mode
, EXPAND_SUM
);
728 #ifdef POINTERS_EXTEND_UNSIGNED
729 if (GET_MODE (addr
) != Pmode
)
730 addr
= convert_memory_address (Pmode
, addr
);
733 mem
= gen_rtx_MEM (BLKmode
, memory_address (BLKmode
, addr
));
735 /* Get an expression we can use to find the attributes to assign to MEM.
736 If it is an ADDR_EXPR, use the operand. Otherwise, dereference it if
737 we can. First remove any nops. */
738 while ((TREE_CODE (exp
) == NOP_EXPR
|| TREE_CODE (exp
) == CONVERT_EXPR
739 || TREE_CODE (exp
) == NON_LVALUE_EXPR
)
740 && POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (exp
, 0))))
741 exp
= TREE_OPERAND (exp
, 0);
743 if (TREE_CODE (exp
) == ADDR_EXPR
)
745 exp
= TREE_OPERAND (exp
, 0);
746 set_mem_attributes (mem
, exp
, 0);
748 else if (POINTER_TYPE_P (TREE_TYPE (exp
)))
750 exp
= build1 (INDIRECT_REF
, TREE_TYPE (TREE_TYPE (exp
)), exp
);
751 /* memcpy, memset and other builtin stringops can alias with anything. */
752 set_mem_alias_set (mem
, 0);
758 /* Built-in functions to perform an untyped call and return. */
760 /* For each register that may be used for calling a function, this
761 gives a mode used to copy the register's value. VOIDmode indicates
762 the register is not used for calling a function. If the machine
763 has register windows, this gives only the outbound registers.
764 INCOMING_REGNO gives the corresponding inbound register. */
765 static enum machine_mode apply_args_mode
[FIRST_PSEUDO_REGISTER
];
767 /* For each register that may be used for returning values, this gives
768 a mode used to copy the register's value. VOIDmode indicates the
769 register is not used for returning values. If the machine has
770 register windows, this gives only the outbound registers.
771 INCOMING_REGNO gives the corresponding inbound register. */
772 static enum machine_mode apply_result_mode
[FIRST_PSEUDO_REGISTER
];
774 /* For each register that may be used for calling a function, this
775 gives the offset of that register into the block returned by
776 __builtin_apply_args. 0 indicates that the register is not
777 used for calling a function. */
778 static int apply_args_reg_offset
[FIRST_PSEUDO_REGISTER
];
780 /* Return the offset of register REGNO into the block returned by
781 __builtin_apply_args. This is not declared static, since it is
782 needed in objc-act.c. */
785 apply_args_register_offset (regno
)
790 /* Arguments are always put in outgoing registers (in the argument
791 block) if such make sense. */
792 #ifdef OUTGOING_REGNO
793 regno
= OUTGOING_REGNO(regno
);
795 return apply_args_reg_offset
[regno
];
798 /* Return the size required for the block returned by __builtin_apply_args,
799 and initialize apply_args_mode. */
804 static int size
= -1;
806 enum machine_mode mode
;
808 /* The values computed by this function never change. */
811 /* The first value is the incoming arg-pointer. */
812 size
= GET_MODE_SIZE (Pmode
);
814 /* The second value is the structure value address unless this is
815 passed as an "invisible" first argument. */
816 if (struct_value_rtx
)
817 size
+= GET_MODE_SIZE (Pmode
);
819 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
820 if (FUNCTION_ARG_REGNO_P (regno
))
822 /* Search for the proper mode for copying this register's
823 value. I'm not sure this is right, but it works so far. */
824 enum machine_mode best_mode
= VOIDmode
;
826 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_INT
);
828 mode
= GET_MODE_WIDER_MODE (mode
))
829 if (HARD_REGNO_MODE_OK (regno
, mode
)
830 && HARD_REGNO_NREGS (regno
, mode
) == 1)
833 if (best_mode
== VOIDmode
)
834 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_FLOAT
);
836 mode
= GET_MODE_WIDER_MODE (mode
))
837 if (HARD_REGNO_MODE_OK (regno
, mode
)
838 && have_insn_for (SET
, mode
))
841 if (best_mode
== VOIDmode
)
842 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_VECTOR_FLOAT
);
844 mode
= GET_MODE_WIDER_MODE (mode
))
845 if (HARD_REGNO_MODE_OK (regno
, mode
)
846 && have_insn_for (SET
, mode
))
849 if (best_mode
== VOIDmode
)
850 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_VECTOR_INT
);
852 mode
= GET_MODE_WIDER_MODE (mode
))
853 if (HARD_REGNO_MODE_OK (regno
, mode
)
854 && have_insn_for (SET
, mode
))
858 if (mode
== VOIDmode
)
861 align
= GET_MODE_ALIGNMENT (mode
) / BITS_PER_UNIT
;
862 if (size
% align
!= 0)
863 size
= CEIL (size
, align
) * align
;
864 apply_args_reg_offset
[regno
] = size
;
865 size
+= GET_MODE_SIZE (mode
);
866 apply_args_mode
[regno
] = mode
;
870 apply_args_mode
[regno
] = VOIDmode
;
871 apply_args_reg_offset
[regno
] = 0;
877 /* Return the size required for the block returned by __builtin_apply,
878 and initialize apply_result_mode. */
883 static int size
= -1;
885 enum machine_mode mode
;
887 /* The values computed by this function never change. */
892 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
893 if (FUNCTION_VALUE_REGNO_P (regno
))
895 /* Search for the proper mode for copying this register's
896 value. I'm not sure this is right, but it works so far. */
897 enum machine_mode best_mode
= VOIDmode
;
899 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_INT
);
901 mode
= GET_MODE_WIDER_MODE (mode
))
902 if (HARD_REGNO_MODE_OK (regno
, mode
))
905 if (best_mode
== VOIDmode
)
906 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_FLOAT
);
908 mode
= GET_MODE_WIDER_MODE (mode
))
909 if (HARD_REGNO_MODE_OK (regno
, mode
)
910 && have_insn_for (SET
, mode
))
913 if (best_mode
== VOIDmode
)
914 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_VECTOR_FLOAT
);
916 mode
= GET_MODE_WIDER_MODE (mode
))
917 if (HARD_REGNO_MODE_OK (regno
, mode
)
918 && have_insn_for (SET
, mode
))
921 if (best_mode
== VOIDmode
)
922 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_VECTOR_INT
);
924 mode
= GET_MODE_WIDER_MODE (mode
))
925 if (HARD_REGNO_MODE_OK (regno
, mode
)
926 && have_insn_for (SET
, mode
))
930 if (mode
== VOIDmode
)
933 align
= GET_MODE_ALIGNMENT (mode
) / BITS_PER_UNIT
;
934 if (size
% align
!= 0)
935 size
= CEIL (size
, align
) * align
;
936 size
+= GET_MODE_SIZE (mode
);
937 apply_result_mode
[regno
] = mode
;
940 apply_result_mode
[regno
] = VOIDmode
;
942 /* Allow targets that use untyped_call and untyped_return to override
943 the size so that machine-specific information can be stored here. */
944 #ifdef APPLY_RESULT_SIZE
945 size
= APPLY_RESULT_SIZE
;
951 #if defined (HAVE_untyped_call) || defined (HAVE_untyped_return)
952 /* Create a vector describing the result block RESULT. If SAVEP is true,
953 the result block is used to save the values; otherwise it is used to
954 restore the values. */
957 result_vector (savep
, result
)
961 int regno
, size
, align
, nelts
;
962 enum machine_mode mode
;
964 rtx
*savevec
= (rtx
*) alloca (FIRST_PSEUDO_REGISTER
* sizeof (rtx
));
967 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
968 if ((mode
= apply_result_mode
[regno
]) != VOIDmode
)
970 align
= GET_MODE_ALIGNMENT (mode
) / BITS_PER_UNIT
;
971 if (size
% align
!= 0)
972 size
= CEIL (size
, align
) * align
;
973 reg
= gen_rtx_REG (mode
, savep
? regno
: INCOMING_REGNO (regno
));
974 mem
= adjust_address (result
, mode
, size
);
975 savevec
[nelts
++] = (savep
976 ? gen_rtx_SET (VOIDmode
, mem
, reg
)
977 : gen_rtx_SET (VOIDmode
, reg
, mem
));
978 size
+= GET_MODE_SIZE (mode
);
980 return gen_rtx_PARALLEL (VOIDmode
, gen_rtvec_v (nelts
, savevec
));
982 #endif /* HAVE_untyped_call or HAVE_untyped_return */
984 /* Save the state required to perform an untyped call with the same
985 arguments as were passed to the current function. */
988 expand_builtin_apply_args_1 ()
991 int size
, align
, regno
;
992 enum machine_mode mode
;
994 /* Create a block where the arg-pointer, structure value address,
995 and argument registers can be saved. */
996 registers
= assign_stack_local (BLKmode
, apply_args_size (), -1);
998 /* Walk past the arg-pointer and structure value address. */
999 size
= GET_MODE_SIZE (Pmode
);
1000 if (struct_value_rtx
)
1001 size
+= GET_MODE_SIZE (Pmode
);
1003 /* Save each register used in calling a function to the block. */
1004 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
1005 if ((mode
= apply_args_mode
[regno
]) != VOIDmode
)
1009 align
= GET_MODE_ALIGNMENT (mode
) / BITS_PER_UNIT
;
1010 if (size
% align
!= 0)
1011 size
= CEIL (size
, align
) * align
;
1013 tem
= gen_rtx_REG (mode
, INCOMING_REGNO (regno
));
1015 emit_move_insn (adjust_address (registers
, mode
, size
), tem
);
1016 size
+= GET_MODE_SIZE (mode
);
1019 /* Save the arg pointer to the block. */
1020 emit_move_insn (adjust_address (registers
, Pmode
, 0),
1021 copy_to_reg (virtual_incoming_args_rtx
));
1022 size
= GET_MODE_SIZE (Pmode
);
1024 /* Save the structure value address unless this is passed as an
1025 "invisible" first argument. */
1026 if (struct_value_incoming_rtx
)
1028 emit_move_insn (adjust_address (registers
, Pmode
, size
),
1029 copy_to_reg (struct_value_incoming_rtx
));
1030 size
+= GET_MODE_SIZE (Pmode
);
1033 /* Return the address of the block. */
1034 return copy_addr_to_reg (XEXP (registers
, 0));
1037 /* __builtin_apply_args returns block of memory allocated on
1038 the stack into which is stored the arg pointer, structure
1039 value address, static chain, and all the registers that might
1040 possibly be used in performing a function call. The code is
1041 moved to the start of the function so the incoming values are
1045 expand_builtin_apply_args ()
1047 /* Don't do __builtin_apply_args more than once in a function.
1048 Save the result of the first call and reuse it. */
1049 if (apply_args_value
!= 0)
1050 return apply_args_value
;
1052 /* When this function is called, it means that registers must be
1053 saved on entry to this function. So we migrate the
1054 call to the first insn of this function. */
1059 temp
= expand_builtin_apply_args_1 ();
1063 apply_args_value
= temp
;
1065 /* Put the sequence after the NOTE that starts the function.
1066 If this is inside a SEQUENCE, make the outer-level insn
1067 chain current, so the code is placed at the start of the
1069 push_topmost_sequence ();
1070 emit_insns_before (seq
, NEXT_INSN (get_insns ()));
1071 pop_topmost_sequence ();
1076 /* Perform an untyped call and save the state required to perform an
1077 untyped return of whatever value was returned by the given function. */
1080 expand_builtin_apply (function
, arguments
, argsize
)
1081 rtx function
, arguments
, argsize
;
1083 int size
, align
, regno
;
1084 enum machine_mode mode
;
1085 rtx incoming_args
, result
, reg
, dest
, src
, call_insn
;
1086 rtx old_stack_level
= 0;
1087 rtx call_fusage
= 0;
1089 #ifdef POINTERS_EXTEND_UNSIGNED
1090 if (GET_MODE (arguments
) != Pmode
)
1091 arguments
= convert_memory_address (Pmode
, arguments
);
1094 /* Create a block where the return registers can be saved. */
1095 result
= assign_stack_local (BLKmode
, apply_result_size (), -1);
1097 /* Fetch the arg pointer from the ARGUMENTS block. */
1098 incoming_args
= gen_reg_rtx (Pmode
);
1099 emit_move_insn (incoming_args
, gen_rtx_MEM (Pmode
, arguments
));
1100 #ifndef STACK_GROWS_DOWNWARD
1101 incoming_args
= expand_simple_binop (Pmode
, MINUS
, incoming_args
, argsize
,
1102 incoming_args
, 0, OPTAB_LIB_WIDEN
);
1105 /* Perform postincrements before actually calling the function. */
1108 /* Push a new argument block and copy the arguments. Do not allow
1109 the (potential) memcpy call below to interfere with our stack
1111 do_pending_stack_adjust ();
1114 /* Save the stack with nonlocal if available */
1115 #ifdef HAVE_save_stack_nonlocal
1116 if (HAVE_save_stack_nonlocal
)
1117 emit_stack_save (SAVE_NONLOCAL
, &old_stack_level
, NULL_RTX
);
1120 emit_stack_save (SAVE_BLOCK
, &old_stack_level
, NULL_RTX
);
1122 /* Push a block of memory onto the stack to store the memory arguments.
1123 Save the address in a register, and copy the memory arguments. ??? I
1124 haven't figured out how the calling convention macros effect this,
1125 but it's likely that the source and/or destination addresses in
1126 the block copy will need updating in machine specific ways. */
1127 dest
= allocate_dynamic_stack_space (argsize
, 0, BITS_PER_UNIT
);
1128 dest
= gen_rtx_MEM (BLKmode
, dest
);
1129 set_mem_align (dest
, PARM_BOUNDARY
);
1130 src
= gen_rtx_MEM (BLKmode
, incoming_args
);
1131 set_mem_align (src
, PARM_BOUNDARY
);
1132 emit_block_move (dest
, src
, argsize
);
1134 /* Refer to the argument block. */
1136 arguments
= gen_rtx_MEM (BLKmode
, arguments
);
1137 set_mem_align (arguments
, PARM_BOUNDARY
);
1139 /* Walk past the arg-pointer and structure value address. */
1140 size
= GET_MODE_SIZE (Pmode
);
1141 if (struct_value_rtx
)
1142 size
+= GET_MODE_SIZE (Pmode
);
1144 /* Restore each of the registers previously saved. Make USE insns
1145 for each of these registers for use in making the call. */
1146 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
1147 if ((mode
= apply_args_mode
[regno
]) != VOIDmode
)
1149 align
= GET_MODE_ALIGNMENT (mode
) / BITS_PER_UNIT
;
1150 if (size
% align
!= 0)
1151 size
= CEIL (size
, align
) * align
;
1152 reg
= gen_rtx_REG (mode
, regno
);
1153 emit_move_insn (reg
, adjust_address (arguments
, mode
, size
));
1154 use_reg (&call_fusage
, reg
);
1155 size
+= GET_MODE_SIZE (mode
);
1158 /* Restore the structure value address unless this is passed as an
1159 "invisible" first argument. */
1160 size
= GET_MODE_SIZE (Pmode
);
1161 if (struct_value_rtx
)
1163 rtx value
= gen_reg_rtx (Pmode
);
1164 emit_move_insn (value
, adjust_address (arguments
, Pmode
, size
));
1165 emit_move_insn (struct_value_rtx
, value
);
1166 if (GET_CODE (struct_value_rtx
) == REG
)
1167 use_reg (&call_fusage
, struct_value_rtx
);
1168 size
+= GET_MODE_SIZE (Pmode
);
1171 /* All arguments and registers used for the call are set up by now! */
1172 function
= prepare_call_address (function
, NULL_TREE
, &call_fusage
, 0, 0);
1174 /* Ensure address is valid. SYMBOL_REF is already valid, so no need,
1175 and we don't want to load it into a register as an optimization,
1176 because prepare_call_address already did it if it should be done. */
1177 if (GET_CODE (function
) != SYMBOL_REF
)
1178 function
= memory_address (FUNCTION_MODE
, function
);
1180 /* Generate the actual call instruction and save the return value. */
1181 #ifdef HAVE_untyped_call
1182 if (HAVE_untyped_call
)
1183 emit_call_insn (gen_untyped_call (gen_rtx_MEM (FUNCTION_MODE
, function
),
1184 result
, result_vector (1, result
)));
1187 #ifdef HAVE_call_value
1188 if (HAVE_call_value
)
1192 /* Locate the unique return register. It is not possible to
1193 express a call that sets more than one return register using
1194 call_value; use untyped_call for that. In fact, untyped_call
1195 only needs to save the return registers in the given block. */
1196 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
1197 if ((mode
= apply_result_mode
[regno
]) != VOIDmode
)
1200 abort (); /* HAVE_untyped_call required. */
1201 valreg
= gen_rtx_REG (mode
, regno
);
1204 emit_call_insn (GEN_CALL_VALUE (valreg
,
1205 gen_rtx_MEM (FUNCTION_MODE
, function
),
1206 const0_rtx
, NULL_RTX
, const0_rtx
));
1208 emit_move_insn (adjust_address (result
, GET_MODE (valreg
), 0), valreg
);
1214 /* Find the CALL insn we just emitted. */
1215 for (call_insn
= get_last_insn ();
1216 call_insn
&& GET_CODE (call_insn
) != CALL_INSN
;
1217 call_insn
= PREV_INSN (call_insn
))
1223 /* Put the register usage information on the CALL. If there is already
1224 some usage information, put ours at the end. */
1225 if (CALL_INSN_FUNCTION_USAGE (call_insn
))
1229 for (link
= CALL_INSN_FUNCTION_USAGE (call_insn
); XEXP (link
, 1) != 0;
1230 link
= XEXP (link
, 1))
1233 XEXP (link
, 1) = call_fusage
;
1236 CALL_INSN_FUNCTION_USAGE (call_insn
) = call_fusage
;
1238 /* Restore the stack. */
1239 #ifdef HAVE_save_stack_nonlocal
1240 if (HAVE_save_stack_nonlocal
)
1241 emit_stack_restore (SAVE_NONLOCAL
, old_stack_level
, NULL_RTX
);
1244 emit_stack_restore (SAVE_BLOCK
, old_stack_level
, NULL_RTX
);
1248 /* Return the address of the result block. */
1249 return copy_addr_to_reg (XEXP (result
, 0));
1252 /* Perform an untyped return. */
1255 expand_builtin_return (result
)
1258 int size
, align
, regno
;
1259 enum machine_mode mode
;
1261 rtx call_fusage
= 0;
1263 #ifdef POINTERS_EXTEND_UNSIGNED
1264 if (GET_MODE (result
) != Pmode
)
1265 result
= convert_memory_address (Pmode
, result
);
1268 apply_result_size ();
1269 result
= gen_rtx_MEM (BLKmode
, result
);
1271 #ifdef HAVE_untyped_return
1272 if (HAVE_untyped_return
)
1274 emit_jump_insn (gen_untyped_return (result
, result_vector (0, result
)));
1280 /* Restore the return value and note that each value is used. */
1282 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
1283 if ((mode
= apply_result_mode
[regno
]) != VOIDmode
)
1285 align
= GET_MODE_ALIGNMENT (mode
) / BITS_PER_UNIT
;
1286 if (size
% align
!= 0)
1287 size
= CEIL (size
, align
) * align
;
1288 reg
= gen_rtx_REG (mode
, INCOMING_REGNO (regno
));
1289 emit_move_insn (reg
, adjust_address (result
, mode
, size
));
1291 push_to_sequence (call_fusage
);
1292 emit_insn (gen_rtx_USE (VOIDmode
, reg
));
1293 call_fusage
= get_insns ();
1295 size
+= GET_MODE_SIZE (mode
);
1298 /* Put the USE insns before the return. */
1299 emit_insns (call_fusage
);
1301 /* Return whatever values was restored by jumping directly to the end
1303 expand_null_return ();
1306 /* Used by expand_builtin_classify_type and fold_builtin_classify_type. */
1308 static enum type_class
1309 type_to_class (type
)
1312 switch (TREE_CODE (type
))
1314 case VOID_TYPE
: return void_type_class
;
1315 case INTEGER_TYPE
: return integer_type_class
;
1316 case CHAR_TYPE
: return char_type_class
;
1317 case ENUMERAL_TYPE
: return enumeral_type_class
;
1318 case BOOLEAN_TYPE
: return boolean_type_class
;
1319 case POINTER_TYPE
: return pointer_type_class
;
1320 case REFERENCE_TYPE
: return reference_type_class
;
1321 case OFFSET_TYPE
: return offset_type_class
;
1322 case REAL_TYPE
: return real_type_class
;
1323 case COMPLEX_TYPE
: return complex_type_class
;
1324 case FUNCTION_TYPE
: return function_type_class
;
1325 case METHOD_TYPE
: return method_type_class
;
1326 case RECORD_TYPE
: return record_type_class
;
1328 case QUAL_UNION_TYPE
: return union_type_class
;
1329 case ARRAY_TYPE
: return (TYPE_STRING_FLAG (type
)
1330 ? string_type_class
: array_type_class
);
1331 case SET_TYPE
: return set_type_class
;
1332 case FILE_TYPE
: return file_type_class
;
1333 case LANG_TYPE
: return lang_type_class
;
1334 default: return no_type_class
;
1338 /* Expand a call to __builtin_classify_type with arguments found in
1342 expand_builtin_classify_type (arglist
)
1346 return GEN_INT (type_to_class (TREE_TYPE (TREE_VALUE (arglist
))));
1347 return GEN_INT (no_type_class
);
1350 /* Expand expression EXP, which is a call to __builtin_constant_p. */
1353 expand_builtin_constant_p (exp
)
1356 tree arglist
= TREE_OPERAND (exp
, 1);
1357 enum machine_mode value_mode
= TYPE_MODE (TREE_TYPE (exp
));
1362 arglist
= TREE_VALUE (arglist
);
1364 /* We have taken care of the easy cases during constant folding. This
1365 case is not obvious, so emit (constant_p_rtx (ARGLIST)) and let CSE get a
1366 chance to see if it can deduce whether ARGLIST is constant. */
1368 tmp
= expand_expr (arglist
, NULL_RTX
, VOIDmode
, 0);
1369 tmp
= gen_rtx_CONSTANT_P_RTX (value_mode
, tmp
);
1373 /* Expand a call to one of the builtin math functions (sin, cos, or sqrt).
1374 Return 0 if a normal call should be emitted rather than expanding the
1375 function in-line. EXP is the expression that is a call to the builtin
1376 function; if convenient, the result should be placed in TARGET.
1377 SUBTARGET may be used as the target for computing one of EXP's operands. */
1380 expand_builtin_mathfn (exp
, target
, subtarget
)
1382 rtx target
, subtarget
;
1384 optab builtin_optab
;
1386 tree fndecl
= TREE_OPERAND (TREE_OPERAND (exp
, 0), 0);
1387 tree arglist
= TREE_OPERAND (exp
, 1);
1389 if (!validate_arglist (arglist
, REAL_TYPE
, VOID_TYPE
))
1392 /* Stabilize and compute the argument. */
1393 if (TREE_CODE (TREE_VALUE (arglist
)) != VAR_DECL
1394 && TREE_CODE (TREE_VALUE (arglist
)) != PARM_DECL
)
1396 exp
= copy_node (exp
);
1397 TREE_OPERAND (exp
, 1) = arglist
;
1398 /* Wrap the computation of the argument in a SAVE_EXPR. That
1399 way, if we need to expand the argument again (as in the
1400 flag_errno_math case below where we cannot directly set
1401 errno), we will not perform side-effects more than once.
1402 Note that here we're mutating the original EXP as well as the
1403 copy; that's the right thing to do in case the original EXP
1404 is expanded later. */
1405 TREE_VALUE (arglist
) = save_expr (TREE_VALUE (arglist
));
1406 arglist
= copy_node (arglist
);
1408 op0
= expand_expr (TREE_VALUE (arglist
), subtarget
, VOIDmode
, 0);
1410 /* Make a suitable register to place result in. */
1411 target
= gen_reg_rtx (TYPE_MODE (TREE_TYPE (exp
)));
1416 switch (DECL_FUNCTION_CODE (fndecl
))
1421 builtin_optab
= sin_optab
; break;
1425 builtin_optab
= cos_optab
; break;
1426 case BUILT_IN_FSQRT
:
1427 case BUILT_IN_SQRTF
:
1428 case BUILT_IN_SQRTL
:
1429 builtin_optab
= sqrt_optab
; break;
1434 /* Compute into TARGET.
1435 Set TARGET to wherever the result comes back. */
1436 target
= expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist
))),
1437 builtin_optab
, op0
, target
, 0);
1439 /* If we were unable to expand via the builtin, stop the
1440 sequence (without outputting the insns) and return 0, causing
1441 a call to the library function. */
1448 /* If errno must be maintained and if we are not allowing unsafe
1449 math optimizations, check the result. */
1451 if (flag_errno_math
&& ! flag_unsafe_math_optimizations
)
1455 /* Don't define the builtin FP instructions
1456 if your machine is not IEEE. */
1457 if (TARGET_FLOAT_FORMAT
!= IEEE_FLOAT_FORMAT
)
1460 lab1
= gen_label_rtx ();
1462 /* Test the result; if it is NaN, set errno=EDOM because
1463 the argument was not in the domain. */
1464 emit_cmp_and_jump_insns (target
, target
, EQ
, 0, GET_MODE (target
),
1469 #ifdef GEN_ERRNO_RTX
1470 rtx errno_rtx
= GEN_ERRNO_RTX
;
1473 = gen_rtx_MEM (word_mode
, gen_rtx_SYMBOL_REF (Pmode
, "errno"));
1476 emit_move_insn (errno_rtx
, GEN_INT (TARGET_EDOM
));
1479 /* We can't set errno=EDOM directly; let the library call do it.
1480 Pop the arguments right away in case the call gets deleted. */
1482 expand_call (exp
, target
, 0);
1489 /* Output the entire sequence. */
1490 insns
= get_insns ();
1497 /* Expand expression EXP which is a call to the strlen builtin. Return 0
1498 if we failed the caller should emit a normal call, otherwise
1499 try to get the result in TARGET, if convenient. */
1502 expand_builtin_strlen (exp
, target
)
1506 tree arglist
= TREE_OPERAND (exp
, 1);
1507 enum machine_mode value_mode
= TYPE_MODE (TREE_TYPE (exp
));
1509 if (!validate_arglist (arglist
, POINTER_TYPE
, VOID_TYPE
))
1514 tree src
= TREE_VALUE (arglist
);
1517 = get_pointer_alignment (src
, BIGGEST_ALIGNMENT
) / BITS_PER_UNIT
;
1519 rtx result
, src_reg
, char_rtx
, before_strlen
;
1520 enum machine_mode insn_mode
= value_mode
, char_mode
;
1521 enum insn_code icode
= CODE_FOR_nothing
;
1523 /* If SRC is not a pointer type, don't do this operation inline. */
1527 /* Bail out if we can't compute strlen in the right mode. */
1528 while (insn_mode
!= VOIDmode
)
1530 icode
= strlen_optab
->handlers
[(int) insn_mode
].insn_code
;
1531 if (icode
!= CODE_FOR_nothing
)
1534 insn_mode
= GET_MODE_WIDER_MODE (insn_mode
);
1536 if (insn_mode
== VOIDmode
)
1539 /* Make a place to write the result of the instruction. */
1542 && GET_CODE (result
) == REG
1543 && GET_MODE (result
) == insn_mode
1544 && REGNO (result
) >= FIRST_PSEUDO_REGISTER
))
1545 result
= gen_reg_rtx (insn_mode
);
1547 /* Make a place to hold the source address. We will not expand
1548 the actual source until we are sure that the expansion will
1549 not fail -- there are trees that cannot be expanded twice. */
1550 src_reg
= gen_reg_rtx (Pmode
);
1552 /* Mark the beginning of the strlen sequence so we can emit the
1553 source operand later. */
1554 before_strlen
= get_last_insn();
1556 /* Check the string is readable and has an end. */
1557 if (current_function_check_memory_usage
)
1558 emit_library_call (chkr_check_str_libfunc
, LCT_CONST_MAKE_BLOCK
,
1559 VOIDmode
, 2, src_reg
, Pmode
,
1560 GEN_INT (MEMORY_USE_RO
),
1561 TYPE_MODE (integer_type_node
));
1563 char_rtx
= const0_rtx
;
1564 char_mode
= insn_data
[(int) icode
].operand
[2].mode
;
1565 if (! (*insn_data
[(int) icode
].operand
[2].predicate
) (char_rtx
,
1567 char_rtx
= copy_to_mode_reg (char_mode
, char_rtx
);
1569 pat
= GEN_FCN (icode
) (result
, gen_rtx_MEM (BLKmode
, src_reg
),
1570 char_rtx
, GEN_INT (align
));
1575 /* Now that we are assured of success, expand the source. */
1577 pat
= memory_address (BLKmode
,
1578 expand_expr (src
, src_reg
, ptr_mode
, EXPAND_SUM
));
1580 emit_move_insn (src_reg
, pat
);
1581 pat
= gen_sequence ();
1585 emit_insn_after (pat
, before_strlen
);
1587 emit_insn_before (pat
, get_insns ());
1589 /* Return the value in the proper mode for this function. */
1590 if (GET_MODE (result
) == value_mode
)
1592 else if (target
!= 0)
1593 convert_move (target
, result
, 0);
1595 target
= convert_to_mode (value_mode
, result
, 0);
1601 /* Expand a call to the strstr builtin. Return 0 if we failed the
1602 caller should emit a normal call, otherwise try to get the result
1603 in TARGET, if convenient (and in mode MODE if that's convenient). */
1606 expand_builtin_strstr (arglist
, target
, mode
)
1609 enum machine_mode mode
;
1611 if (!validate_arglist (arglist
, POINTER_TYPE
, POINTER_TYPE
, VOID_TYPE
)
1612 || current_function_check_memory_usage
)
1616 tree s1
= TREE_VALUE (arglist
), s2
= TREE_VALUE (TREE_CHAIN (arglist
));
1618 const char *p1
, *p2
;
1627 const char *r
= strstr (p1
, p2
);
1632 /* Return an offset into the constant string argument. */
1633 return expand_expr (fold (build (PLUS_EXPR
, TREE_TYPE (s1
),
1634 s1
, ssize_int (r
- p1
))),
1635 target
, mode
, EXPAND_NORMAL
);
1639 return expand_expr (s1
, target
, mode
, EXPAND_NORMAL
);
1644 fn
= built_in_decls
[BUILT_IN_STRCHR
];
1648 /* New argument list transforming strstr(s1, s2) to
1649 strchr(s1, s2[0]). */
1651 build_tree_list (NULL_TREE
, build_int_2 (p2
[0], 0));
1652 arglist
= tree_cons (NULL_TREE
, s1
, arglist
);
1653 return expand_expr (build_function_call_expr (fn
, arglist
),
1654 target
, mode
, EXPAND_NORMAL
);
1658 /* Expand a call to the strchr builtin. Return 0 if we failed the
1659 caller should emit a normal call, otherwise try to get the result
1660 in TARGET, if convenient (and in mode MODE if that's convenient). */
1663 expand_builtin_strchr (arglist
, target
, mode
)
1666 enum machine_mode mode
;
1668 if (!validate_arglist (arglist
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
)
1669 || current_function_check_memory_usage
)
1673 tree s1
= TREE_VALUE (arglist
), s2
= TREE_VALUE (TREE_CHAIN (arglist
));
1676 if (TREE_CODE (s2
) != INTEGER_CST
)
1685 if (target_char_cast (s2
, &c
))
1693 /* Return an offset into the constant string argument. */
1694 return expand_expr (fold (build (PLUS_EXPR
, TREE_TYPE (s1
),
1695 s1
, ssize_int (r
- p1
))),
1696 target
, mode
, EXPAND_NORMAL
);
1699 /* FIXME: Should use here strchrM optab so that ports can optimize
1705 /* Expand a call to the strrchr builtin. Return 0 if we failed the
1706 caller should emit a normal call, otherwise try to get the result
1707 in TARGET, if convenient (and in mode MODE if that's convenient). */
1710 expand_builtin_strrchr (arglist
, target
, mode
)
1713 enum machine_mode mode
;
1715 if (!validate_arglist (arglist
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
)
1716 || current_function_check_memory_usage
)
1720 tree s1
= TREE_VALUE (arglist
), s2
= TREE_VALUE (TREE_CHAIN (arglist
));
1724 if (TREE_CODE (s2
) != INTEGER_CST
)
1733 if (target_char_cast (s2
, &c
))
1736 r
= strrchr (p1
, c
);
1741 /* Return an offset into the constant string argument. */
1742 return expand_expr (fold (build (PLUS_EXPR
, TREE_TYPE (s1
),
1743 s1
, ssize_int (r
- p1
))),
1744 target
, mode
, EXPAND_NORMAL
);
1747 if (! integer_zerop (s2
))
1750 fn
= built_in_decls
[BUILT_IN_STRCHR
];
1754 /* Transform strrchr(s1, '\0') to strchr(s1, '\0'). */
1755 return expand_expr (build_function_call_expr (fn
, arglist
),
1756 target
, mode
, EXPAND_NORMAL
);
1760 /* Expand a call to the strpbrk builtin. Return 0 if we failed the
1761 caller should emit a normal call, otherwise try to get the result
1762 in TARGET, if convenient (and in mode MODE if that's convenient). */
1765 expand_builtin_strpbrk (arglist
, target
, mode
)
1768 enum machine_mode mode
;
1770 if (!validate_arglist (arglist
, POINTER_TYPE
, POINTER_TYPE
, VOID_TYPE
)
1771 || current_function_check_memory_usage
)
1775 tree s1
= TREE_VALUE (arglist
), s2
= TREE_VALUE (TREE_CHAIN (arglist
));
1777 const char *p1
, *p2
;
1786 const char *r
= strpbrk (p1
, p2
);
1791 /* Return an offset into the constant string argument. */
1792 return expand_expr (fold (build (PLUS_EXPR
, TREE_TYPE (s1
),
1793 s1
, ssize_int (r
- p1
))),
1794 target
, mode
, EXPAND_NORMAL
);
1799 /* strpbrk(x, "") == NULL.
1800 Evaluate and ignore the arguments in case they had
1802 expand_expr (s1
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
1807 return 0; /* Really call strpbrk. */
1809 fn
= built_in_decls
[BUILT_IN_STRCHR
];
1813 /* New argument list transforming strpbrk(s1, s2) to
1814 strchr(s1, s2[0]). */
1816 build_tree_list (NULL_TREE
, build_int_2 (p2
[0], 0));
1817 arglist
= tree_cons (NULL_TREE
, s1
, arglist
);
1818 return expand_expr (build_function_call_expr (fn
, arglist
),
1819 target
, mode
, EXPAND_NORMAL
);
1823 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
1824 bytes from constant string DATA + OFFSET and return it as target
1828 builtin_memcpy_read_str (data
, offset
, mode
)
1830 HOST_WIDE_INT offset
;
1831 enum machine_mode mode
;
1833 const char *str
= (const char *) data
;
1836 || ((unsigned HOST_WIDE_INT
) offset
+ GET_MODE_SIZE (mode
)
1837 > strlen (str
) + 1))
1838 abort (); /* Attempt to read past the end of constant string. */
1840 return c_readstr (str
+ offset
, mode
);
1843 /* Expand a call to the memcpy builtin, with arguments in ARGLIST. */
1846 expand_builtin_memcpy (arglist
)
1849 if (!validate_arglist (arglist
,
1850 POINTER_TYPE
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
1854 tree dest
= TREE_VALUE (arglist
);
1855 tree src
= TREE_VALUE (TREE_CHAIN (arglist
));
1856 tree len
= TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist
)));
1857 const char *src_str
;
1859 unsigned int src_align
= get_pointer_alignment (src
, BIGGEST_ALIGNMENT
);
1860 unsigned int dest_align
1861 = get_pointer_alignment (dest
, BIGGEST_ALIGNMENT
);
1862 rtx dest_mem
, src_mem
, dest_addr
, len_rtx
;
1864 /* If either SRC or DEST is not a pointer type, don't do
1865 this operation in-line. */
1866 if (src_align
== 0 || dest_align
== 0)
1869 dest_mem
= get_memory_rtx (dest
);
1870 set_mem_align (dest_mem
, dest_align
);
1871 len_rtx
= expand_expr (len
, NULL_RTX
, VOIDmode
, 0);
1872 src_str
= c_getstr (src
);
1874 /* If SRC is a string constant and block move would be done
1875 by pieces, we can avoid loading the string from memory
1876 and only stored the computed constants. */
1878 && !current_function_check_memory_usage
1879 && GET_CODE (len_rtx
) == CONST_INT
1880 && (unsigned HOST_WIDE_INT
) INTVAL (len_rtx
) <= strlen (src_str
) + 1
1881 && can_store_by_pieces (INTVAL (len_rtx
), builtin_memcpy_read_str
,
1882 (PTR
) src_str
, dest_align
))
1884 store_by_pieces (dest_mem
, INTVAL (len_rtx
),
1885 builtin_memcpy_read_str
,
1886 (PTR
) src_str
, dest_align
);
1887 return force_operand (XEXP (dest_mem
, 0), NULL_RTX
);
1890 src_mem
= get_memory_rtx (src
);
1891 set_mem_align (src_mem
, src_align
);
1893 /* Just copy the rights of SRC to the rights of DEST. */
1894 if (current_function_check_memory_usage
)
1895 emit_library_call (chkr_copy_bitmap_libfunc
, LCT_CONST_MAKE_BLOCK
,
1896 VOIDmode
, 3, XEXP (dest_mem
, 0), Pmode
,
1897 XEXP (src_mem
, 0), Pmode
,
1898 len_rtx
, TYPE_MODE (sizetype
));
1900 /* Copy word part most expediently. */
1901 dest_addr
= emit_block_move (dest_mem
, src_mem
, len_rtx
);
1904 dest_addr
= force_operand (XEXP (dest_mem
, 0), NULL_RTX
);
1910 /* Expand expression EXP, which is a call to the strcpy builtin. Return 0
1911 if we failed the caller should emit a normal call. */
1914 expand_builtin_strcpy (exp
)
1917 tree arglist
= TREE_OPERAND (exp
, 1);
1920 if (!validate_arglist (arglist
, POINTER_TYPE
, POINTER_TYPE
, VOID_TYPE
))
1924 tree len
= c_strlen (TREE_VALUE (TREE_CHAIN (arglist
)));
1929 len
= size_binop (PLUS_EXPR
, len
, ssize_int (1));
1930 chainon (arglist
, build_tree_list (NULL_TREE
, len
));
1933 result
= expand_builtin_memcpy (arglist
);
1936 TREE_CHAIN (TREE_CHAIN (arglist
)) = 0;
1940 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
1941 bytes from constant string DATA + OFFSET and return it as target
1945 builtin_strncpy_read_str (data
, offset
, mode
)
1947 HOST_WIDE_INT offset
;
1948 enum machine_mode mode
;
1950 const char *str
= (const char *) data
;
1952 if ((unsigned HOST_WIDE_INT
) offset
> strlen (str
))
1955 return c_readstr (str
+ offset
, mode
);
1958 /* Expand expression EXP, which is a call to the strncpy builtin. Return 0
1959 if we failed the caller should emit a normal call. */
1962 expand_builtin_strncpy (arglist
, target
, mode
)
1965 enum machine_mode mode
;
1967 if (!validate_arglist (arglist
,
1968 POINTER_TYPE
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
1972 tree slen
= c_strlen (TREE_VALUE (TREE_CHAIN (arglist
)));
1973 tree len
= TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist
)));
1975 /* We must be passed a constant len parameter. */
1976 if (TREE_CODE (len
) != INTEGER_CST
)
1979 /* If the len parameter is zero, return the dst parameter. */
1980 if (compare_tree_int (len
, 0) == 0)
1982 /* Evaluate and ignore the src argument in case it has
1984 expand_expr (TREE_VALUE (TREE_CHAIN (arglist
)), const0_rtx
,
1985 VOIDmode
, EXPAND_NORMAL
);
1986 /* Return the dst parameter. */
1987 return expand_expr (TREE_VALUE (arglist
), target
, mode
,
1991 /* Now, we must be passed a constant src ptr parameter. */
1992 if (slen
== 0 || TREE_CODE (slen
) != INTEGER_CST
)
1995 slen
= size_binop (PLUS_EXPR
, slen
, ssize_int (1));
1997 /* We're required to pad with trailing zeros if the requested
1998 len is greater than strlen(s2)+1. In that case try to
1999 use store_by_pieces, if it fails, punt. */
2000 if (tree_int_cst_lt (slen
, len
))
2002 tree dest
= TREE_VALUE (arglist
);
2003 unsigned int dest_align
2004 = get_pointer_alignment (dest
, BIGGEST_ALIGNMENT
);
2005 const char *p
= c_getstr (TREE_VALUE (TREE_CHAIN (arglist
)));
2008 if (!p
|| dest_align
== 0 || !host_integerp (len
, 1)
2009 || !can_store_by_pieces (tree_low_cst (len
, 1),
2010 builtin_strncpy_read_str
,
2011 (PTR
) p
, dest_align
))
2014 dest_mem
= get_memory_rtx (dest
);
2015 store_by_pieces (dest_mem
, tree_low_cst (len
, 1),
2016 builtin_strncpy_read_str
,
2017 (PTR
) p
, dest_align
);
2018 return force_operand (XEXP (dest_mem
, 0), NULL_RTX
);
2021 /* OK transform into builtin memcpy. */
2022 return expand_builtin_memcpy (arglist
);
2026 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
2027 bytes from constant string DATA + OFFSET and return it as target
2031 builtin_memset_read_str (data
, offset
, mode
)
2033 HOST_WIDE_INT offset ATTRIBUTE_UNUSED
;
2034 enum machine_mode mode
;
2036 const char *c
= (const char *) data
;
2037 char *p
= alloca (GET_MODE_SIZE (mode
));
2039 memset (p
, *c
, GET_MODE_SIZE (mode
));
2041 return c_readstr (p
, mode
);
2044 /* Expand expression EXP, which is a call to the memset builtin. Return 0
2045 if we failed the caller should emit a normal call. */
2048 expand_builtin_memset (exp
)
2051 tree arglist
= TREE_OPERAND (exp
, 1);
2053 if (!validate_arglist (arglist
,
2054 POINTER_TYPE
, INTEGER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
2058 tree dest
= TREE_VALUE (arglist
);
2059 tree val
= TREE_VALUE (TREE_CHAIN (arglist
));
2060 tree len
= TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist
)));
2063 unsigned int dest_align
2064 = get_pointer_alignment (dest
, BIGGEST_ALIGNMENT
);
2065 rtx dest_mem
, dest_addr
, len_rtx
;
2067 /* If DEST is not a pointer type, don't do this
2068 operation in-line. */
2069 if (dest_align
== 0)
2072 if (TREE_CODE (val
) != INTEGER_CST
)
2075 if (target_char_cast (val
, &c
))
2080 if (!host_integerp (len
, 1))
2082 if (current_function_check_memory_usage
2083 || !can_store_by_pieces (tree_low_cst (len
, 1),
2084 builtin_memset_read_str
,
2085 (PTR
) &c
, dest_align
))
2088 dest_mem
= get_memory_rtx (dest
);
2089 store_by_pieces (dest_mem
, tree_low_cst (len
, 1),
2090 builtin_memset_read_str
,
2091 (PTR
) &c
, dest_align
);
2092 return force_operand (XEXP (dest_mem
, 0), NULL_RTX
);
2095 len_rtx
= expand_expr (len
, NULL_RTX
, VOIDmode
, 0);
2097 dest_mem
= get_memory_rtx (dest
);
2098 set_mem_align (dest_mem
, dest_align
);
2100 /* Just check DST is writable and mark it as readable. */
2101 if (current_function_check_memory_usage
)
2102 emit_library_call (chkr_check_addr_libfunc
, LCT_CONST_MAKE_BLOCK
,
2103 VOIDmode
, 3, XEXP (dest_mem
, 0), Pmode
,
2104 len_rtx
, TYPE_MODE (sizetype
),
2105 GEN_INT (MEMORY_USE_WO
),
2106 TYPE_MODE (integer_type_node
));
2109 dest_addr
= clear_storage (dest_mem
, len_rtx
);
2112 dest_addr
= force_operand (XEXP (dest_mem
, 0), NULL_RTX
);
2118 /* Expand expression EXP, which is a call to the bzero builtin. Return 0
2119 if we failed the caller should emit a normal call. */
2122 expand_builtin_bzero (exp
)
2125 tree arglist
= TREE_OPERAND (exp
, 1);
2126 tree dest
, size
, newarglist
;
2129 if (!validate_arglist (arglist
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
2132 dest
= TREE_VALUE (arglist
);
2133 size
= TREE_VALUE (TREE_CHAIN (arglist
));
2135 /* New argument list transforming bzero(ptr x, int y) to
2136 memset(ptr x, int 0, size_t y). */
2138 newarglist
= build_tree_list (NULL_TREE
, convert (sizetype
, size
));
2139 newarglist
= tree_cons (NULL_TREE
, integer_zero_node
, newarglist
);
2140 newarglist
= tree_cons (NULL_TREE
, dest
, newarglist
);
2142 TREE_OPERAND (exp
, 1) = newarglist
;
2143 result
= expand_builtin_memset(exp
);
2145 /* Always restore the original arguments. */
2146 TREE_OPERAND (exp
, 1) = arglist
;
2151 #ifdef HAVE_cmpstrsi
2153 /* Expand expression EXP, which is a call to the memcmp or the strcmp builtin.
2154 ARGLIST is the argument list for this call. Return 0 if we failed and the
2155 caller should emit a normal call, otherwise try to get the result in
2156 TARGET, if convenient. */
2159 expand_builtin_memcmp (exp
, arglist
, target
)
2164 /* If we need to check memory accesses, call the library function. */
2165 if (current_function_check_memory_usage
)
2168 if (!validate_arglist (arglist
,
2169 POINTER_TYPE
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
2173 enum machine_mode mode
;
2174 tree arg1
= TREE_VALUE (arglist
);
2175 tree arg2
= TREE_VALUE (TREE_CHAIN (arglist
));
2176 tree len
= TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist
)));
2177 rtx arg1_rtx
, arg2_rtx
, arg3_rtx
;
2182 = get_pointer_alignment (arg1
, BIGGEST_ALIGNMENT
) / BITS_PER_UNIT
;
2184 = get_pointer_alignment (arg2
, BIGGEST_ALIGNMENT
) / BITS_PER_UNIT
;
2185 enum machine_mode insn_mode
2186 = insn_data
[(int) CODE_FOR_cmpstrsi
].operand
[0].mode
;
2188 /* If we don't have POINTER_TYPE, call the function. */
2189 if (arg1_align
== 0 || arg2_align
== 0)
2192 /* Make a place to write the result of the instruction. */
2195 && GET_CODE (result
) == REG
&& GET_MODE (result
) == insn_mode
2196 && REGNO (result
) >= FIRST_PSEUDO_REGISTER
))
2197 result
= gen_reg_rtx (insn_mode
);
2199 arg1_rtx
= get_memory_rtx (arg1
);
2200 arg2_rtx
= get_memory_rtx (arg2
);
2201 arg3_rtx
= expand_expr (len
, NULL_RTX
, VOIDmode
, 0);
2205 insn
= gen_cmpstrsi (result
, arg1_rtx
, arg2_rtx
, arg3_rtx
,
2206 GEN_INT (MIN (arg1_align
, arg2_align
)));
2211 emit_library_call_value (memcmp_libfunc
, result
, LCT_PURE_MAKE_BLOCK
,
2212 TYPE_MODE (integer_type_node
), 3,
2213 XEXP (arg1_rtx
, 0), Pmode
,
2214 XEXP (arg2_rtx
, 0), Pmode
,
2215 convert_to_mode (TYPE_MODE (sizetype
), arg3_rtx
,
2216 TREE_UNSIGNED (sizetype
)),
2217 TYPE_MODE (sizetype
));
2219 /* Return the value in the proper mode for this function. */
2220 mode
= TYPE_MODE (TREE_TYPE (exp
));
2221 if (GET_MODE (result
) == mode
)
2223 else if (target
!= 0)
2225 convert_move (target
, result
, 0);
2229 return convert_to_mode (mode
, result
, 0);
2234 /* Expand expression EXP, which is a call to the strcmp builtin. Return 0
2235 if we failed the caller should emit a normal call, otherwise try to get
2236 the result in TARGET, if convenient. */
2239 expand_builtin_strcmp (exp
, target
, mode
)
2242 enum machine_mode mode
;
2244 tree arglist
= TREE_OPERAND (exp
, 1);
2246 const char *p1
, *p2
;
2248 /* If we need to check memory accesses, call the library function. */
2249 if (current_function_check_memory_usage
)
2252 if (!validate_arglist (arglist
, POINTER_TYPE
, POINTER_TYPE
, VOID_TYPE
))
2255 arg1
= TREE_VALUE (arglist
);
2256 arg2
= TREE_VALUE (TREE_CHAIN (arglist
));
2258 p1
= c_getstr (arg1
);
2259 p2
= c_getstr (arg2
);
2263 const int i
= strcmp (p1
, p2
);
2264 return (i
< 0 ? constm1_rtx
: (i
> 0 ? const1_rtx
: const0_rtx
));
2267 /* If either arg is "", return an expression corresponding to
2268 (*(const unsigned char*)arg1 - (const unsigned char*)arg2). */
2269 if ((p1
&& *p1
== '\0') || (p2
&& *p2
== '\0'))
2271 tree cst_uchar_node
= build_type_variant (unsigned_char_type_node
, 1, 0);
2272 tree cst_uchar_ptr_node
= build_pointer_type (cst_uchar_node
);
2274 fold (build1 (CONVERT_EXPR
, integer_type_node
,
2275 build1 (INDIRECT_REF
, cst_uchar_node
,
2276 build1 (NOP_EXPR
, cst_uchar_ptr_node
, arg1
))));
2278 fold (build1 (CONVERT_EXPR
, integer_type_node
,
2279 build1 (INDIRECT_REF
, cst_uchar_node
,
2280 build1 (NOP_EXPR
, cst_uchar_ptr_node
, arg2
))));
2281 tree result
= fold (build (MINUS_EXPR
, integer_type_node
, ind1
, ind2
));
2282 return expand_expr (result
, target
, mode
, EXPAND_NORMAL
);
2285 #ifdef HAVE_cmpstrsi
2286 if (! HAVE_cmpstrsi
)
2290 tree len
= c_strlen (arg1
);
2291 tree len2
= c_strlen (arg2
);
2295 len
= size_binop (PLUS_EXPR
, ssize_int (1), len
);
2298 len2
= size_binop (PLUS_EXPR
, ssize_int (1), len2
);
2300 /* If we don't have a constant length for the first, use the length
2301 of the second, if we know it. We don't require a constant for
2302 this case; some cost analysis could be done if both are available
2303 but neither is constant. For now, assume they're equally cheap
2304 unless one has side effects.
2306 If both strings have constant lengths, use the smaller. This
2307 could arise if optimization results in strcpy being called with
2308 two fixed strings, or if the code was machine-generated. We should
2309 add some code to the `memcmp' handler below to deal with such
2310 situations, someday. */
2312 if (!len
|| TREE_CODE (len
) != INTEGER_CST
)
2314 if (len2
&& !TREE_SIDE_EFFECTS (len2
))
2319 else if (len2
&& TREE_CODE (len2
) == INTEGER_CST
2320 && tree_int_cst_lt (len2
, len
))
2323 /* If both arguments have side effects, we cannot optimize. */
2324 if (TREE_SIDE_EFFECTS (len
))
2327 chainon (arglist
, build_tree_list (NULL_TREE
, len
));
2328 result
= expand_builtin_memcmp (exp
, arglist
, target
);
2330 TREE_CHAIN (TREE_CHAIN (arglist
)) = 0;
2339 /* Expand expression EXP, which is a call to the strncmp builtin. Return 0
2340 if we failed the caller should emit a normal call, otherwise try to get
2341 the result in TARGET, if convenient. */
2344 expand_builtin_strncmp (exp
, target
, mode
)
2347 enum machine_mode mode
;
2349 tree arglist
= TREE_OPERAND (exp
, 1);
2350 tree arg1
, arg2
, arg3
;
2351 const char *p1
, *p2
;
2353 /* If we need to check memory accesses, call the library function. */
2354 if (current_function_check_memory_usage
)
2357 if (!validate_arglist (arglist
,
2358 POINTER_TYPE
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
2361 arg1
= TREE_VALUE (arglist
);
2362 arg2
= TREE_VALUE (TREE_CHAIN (arglist
));
2363 arg3
= TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist
)));
2365 /* If the len parameter is zero, return zero. */
2366 if (host_integerp (arg3
, 1) && tree_low_cst (arg3
, 1) == 0)
2368 /* Evaluate and ignore arg1 and arg2 in case they have
2370 expand_expr (arg1
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2371 expand_expr (arg2
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2375 p1
= c_getstr (arg1
);
2376 p2
= c_getstr (arg2
);
2378 /* If all arguments are constant, evaluate at compile-time. */
2379 if (host_integerp (arg3
, 1) && p1
&& p2
)
2381 const int r
= strncmp (p1
, p2
, tree_low_cst (arg3
, 1));
2382 return (r
< 0 ? constm1_rtx
: (r
> 0 ? const1_rtx
: const0_rtx
));
2385 /* If len == 1 or (either string parameter is "" and (len >= 1)),
2386 return (*(const u_char*)arg1 - *(const u_char*)arg2). */
2387 if (host_integerp (arg3
, 1)
2388 && (tree_low_cst (arg3
, 1) == 1
2389 || (tree_low_cst (arg3
, 1) > 1
2390 && ((p1
&& *p1
== '\0') || (p2
&& *p2
== '\0')))))
2392 tree cst_uchar_node
= build_type_variant (unsigned_char_type_node
, 1, 0);
2393 tree cst_uchar_ptr_node
= build_pointer_type (cst_uchar_node
);
2395 fold (build1 (CONVERT_EXPR
, integer_type_node
,
2396 build1 (INDIRECT_REF
, cst_uchar_node
,
2397 build1 (NOP_EXPR
, cst_uchar_ptr_node
, arg1
))));
2399 fold (build1 (CONVERT_EXPR
, integer_type_node
,
2400 build1 (INDIRECT_REF
, cst_uchar_node
,
2401 build1 (NOP_EXPR
, cst_uchar_ptr_node
, arg2
))));
2402 tree result
= fold (build (MINUS_EXPR
, integer_type_node
, ind1
, ind2
));
2403 return expand_expr (result
, target
, mode
, EXPAND_NORMAL
);
2406 #ifdef HAVE_cmpstrsi
2407 /* If c_strlen can determine an expression for one of the string
2408 lengths, and it doesn't have side effects, then call
2409 expand_builtin_memcmp() using length MIN(strlen(string)+1, arg3). */
2412 tree newarglist
, len
= 0;
2414 /* Perhaps one of the strings is really constant, if so prefer
2415 that constant length over the other string's length. */
2417 len
= c_strlen (arg1
);
2419 len
= c_strlen (arg2
);
2421 /* If we still don't have a len, try either string arg as long
2422 as they don't have side effects. */
2423 if (!len
&& !TREE_SIDE_EFFECTS (arg1
))
2424 len
= c_strlen (arg1
);
2425 if (!len
&& !TREE_SIDE_EFFECTS (arg2
))
2426 len
= c_strlen (arg2
);
2427 /* If we still don't have a length, punt. */
2431 /* Add one to the string length. */
2432 len
= fold (size_binop (PLUS_EXPR
, len
, ssize_int (1)));
2434 /* The actual new length parameter is MIN(len,arg3). */
2435 len
= fold (build (MIN_EXPR
, TREE_TYPE (len
), len
, arg3
));
2437 newarglist
= build_tree_list (NULL_TREE
, len
);
2438 newarglist
= tree_cons (NULL_TREE
, arg2
, newarglist
);
2439 newarglist
= tree_cons (NULL_TREE
, arg1
, newarglist
);
2440 return expand_builtin_memcmp (exp
, newarglist
, target
);
2447 /* Expand expression EXP, which is a call to the strcat builtin.
2448 Return 0 if we failed the caller should emit a normal call,
2449 otherwise try to get the result in TARGET, if convenient. */
2452 expand_builtin_strcat (arglist
, target
, mode
)
2455 enum machine_mode mode
;
2457 /* If we need to check memory accesses, call the library function. */
2458 if (current_function_check_memory_usage
)
2461 if (!validate_arglist (arglist
, POINTER_TYPE
, POINTER_TYPE
, VOID_TYPE
))
2465 tree dst
= TREE_VALUE (arglist
),
2466 src
= TREE_VALUE (TREE_CHAIN (arglist
));
2467 const char *p
= c_getstr (src
);
2469 /* If the string length is zero, return the dst parameter. */
2470 if (p
&& *p
== '\0')
2471 return expand_expr (dst
, target
, mode
, EXPAND_NORMAL
);
2477 /* Expand expression EXP, which is a call to the strncat builtin.
2478 Return 0 if we failed the caller should emit a normal call,
2479 otherwise try to get the result in TARGET, if convenient. */
2482 expand_builtin_strncat (arglist
, target
, mode
)
2485 enum machine_mode mode
;
2487 /* If we need to check memory accesses, call the library function. */
2488 if (current_function_check_memory_usage
)
2491 if (!validate_arglist (arglist
,
2492 POINTER_TYPE
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
2496 tree dst
= TREE_VALUE (arglist
),
2497 src
= TREE_VALUE (TREE_CHAIN (arglist
)),
2498 len
= TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist
)));
2499 const char *p
= c_getstr (src
);
2501 /* If the requested length is zero, or the src parameter string
2502 length is zero, return the dst parameter. */
2503 if ((TREE_CODE (len
) == INTEGER_CST
&& compare_tree_int (len
, 0) == 0)
2504 || (p
&& *p
== '\0'))
2506 /* Evaluate and ignore the src and len parameters in case
2507 they have side-effects. */
2508 expand_expr (src
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2509 expand_expr (len
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2510 return expand_expr (dst
, target
, mode
, EXPAND_NORMAL
);
2513 /* If the requested len is greater than or equal to the string
2514 length, call strcat. */
2515 if (TREE_CODE (len
) == INTEGER_CST
&& p
2516 && compare_tree_int (len
, strlen (p
)) >= 0)
2519 tree_cons (NULL_TREE
, dst
, build_tree_list (NULL_TREE
, src
)),
2520 fn
= built_in_decls
[BUILT_IN_STRCAT
];
2522 /* If the replacement _DECL isn't initialized, don't do the
2527 return expand_expr (build_function_call_expr (fn
, newarglist
),
2528 target
, mode
, EXPAND_NORMAL
);
2534 /* Expand expression EXP, which is a call to the strspn builtin.
2535 Return 0 if we failed the caller should emit a normal call,
2536 otherwise try to get the result in TARGET, if convenient. */
2539 expand_builtin_strspn (arglist
, target
, mode
)
2542 enum machine_mode mode
;
2544 /* If we need to check memory accesses, call the library function. */
2545 if (current_function_check_memory_usage
)
2548 if (!validate_arglist (arglist
, POINTER_TYPE
, POINTER_TYPE
, VOID_TYPE
))
2552 tree s1
= TREE_VALUE (arglist
), s2
= TREE_VALUE (TREE_CHAIN (arglist
));
2553 const char *p1
= c_getstr (s1
), *p2
= c_getstr (s2
);
2555 /* If both arguments are constants, evaluate at compile-time. */
2558 const size_t r
= strspn (p1
, p2
);
2559 return expand_expr (size_int (r
), target
, mode
, EXPAND_NORMAL
);
2562 /* If either argument is "", return 0. */
2563 if ((p1
&& *p1
== '\0') || (p2
&& *p2
== '\0'))
2565 /* Evaluate and ignore both arguments in case either one has
2567 expand_expr (s1
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2568 expand_expr (s2
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2575 /* Expand expression EXP, which is a call to the strcspn builtin.
2576 Return 0 if we failed the caller should emit a normal call,
2577 otherwise try to get the result in TARGET, if convenient. */
2580 expand_builtin_strcspn (arglist
, target
, mode
)
2583 enum machine_mode mode
;
2585 /* If we need to check memory accesses, call the library function. */
2586 if (current_function_check_memory_usage
)
2589 if (!validate_arglist (arglist
, POINTER_TYPE
, POINTER_TYPE
, VOID_TYPE
))
2593 tree s1
= TREE_VALUE (arglist
), s2
= TREE_VALUE (TREE_CHAIN (arglist
));
2594 const char *p1
= c_getstr (s1
), *p2
= c_getstr (s2
);
2596 /* If both arguments are constants, evaluate at compile-time. */
2599 const size_t r
= strcspn (p1
, p2
);
2600 return expand_expr (size_int (r
), target
, mode
, EXPAND_NORMAL
);
2603 /* If the first argument is "", return 0. */
2604 if (p1
&& *p1
== '\0')
2606 /* Evaluate and ignore argument s2 in case it has
2608 expand_expr (s2
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2612 /* If the second argument is "", return __builtin_strlen(s1). */
2613 if (p2
&& *p2
== '\0')
2615 tree newarglist
= build_tree_list (NULL_TREE
, s1
),
2616 fn
= built_in_decls
[BUILT_IN_STRLEN
];
2618 /* If the replacement _DECL isn't initialized, don't do the
2623 return expand_expr (build_function_call_expr (fn
, newarglist
),
2624 target
, mode
, EXPAND_NORMAL
);
2630 /* Expand a call to __builtin_saveregs, generating the result in TARGET,
2631 if that's convenient. */
2634 expand_builtin_saveregs ()
2638 /* Don't do __builtin_saveregs more than once in a function.
2639 Save the result of the first call and reuse it. */
2640 if (saveregs_value
!= 0)
2641 return saveregs_value
;
2643 /* When this function is called, it means that registers must be
2644 saved on entry to this function. So we migrate the call to the
2645 first insn of this function. */
2649 #ifdef EXPAND_BUILTIN_SAVEREGS
2650 /* Do whatever the machine needs done in this case. */
2651 val
= EXPAND_BUILTIN_SAVEREGS ();
2653 /* ??? We used to try and build up a call to the out of line function,
2654 guessing about what registers needed saving etc. This became much
2655 harder with __builtin_va_start, since we don't have a tree for a
2656 call to __builtin_saveregs to fall back on. There was exactly one
2657 port (i860) that used this code, and I'm unconvinced it could actually
2658 handle the general case. So we no longer try to handle anything
2659 weird and make the backend absorb the evil. */
2661 error ("__builtin_saveregs not supported by this target");
2668 saveregs_value
= val
;
2670 /* Put the sequence after the NOTE that starts the function. If this
2671 is inside a SEQUENCE, make the outer-level insn chain current, so
2672 the code is placed at the start of the function. */
2673 push_topmost_sequence ();
2674 emit_insns_after (seq
, get_insns ());
2675 pop_topmost_sequence ();
2680 /* __builtin_args_info (N) returns word N of the arg space info
2681 for the current function. The number and meanings of words
2682 is controlled by the definition of CUMULATIVE_ARGS. */
2685 expand_builtin_args_info (exp
)
2688 tree arglist
= TREE_OPERAND (exp
, 1);
2689 int nwords
= sizeof (CUMULATIVE_ARGS
) / sizeof (int);
2690 int *word_ptr
= (int *) ¤t_function_args_info
;
2692 /* These are used by the code below that is if 0'ed away */
2694 tree type
, elts
, result
;
2697 if (sizeof (CUMULATIVE_ARGS
) % sizeof (int) != 0)
2702 if (!host_integerp (TREE_VALUE (arglist
), 0))
2703 error ("argument of `__builtin_args_info' must be constant");
2706 HOST_WIDE_INT wordnum
= tree_low_cst (TREE_VALUE (arglist
), 0);
2708 if (wordnum
< 0 || wordnum
>= nwords
)
2709 error ("argument of `__builtin_args_info' out of range");
2711 return GEN_INT (word_ptr
[wordnum
]);
2715 error ("missing argument in `__builtin_args_info'");
2720 for (i
= 0; i
< nwords
; i
++)
2721 elts
= tree_cons (NULL_TREE
, build_int_2 (word_ptr
[i
], 0));
2723 type
= build_array_type (integer_type_node
,
2724 build_index_type (build_int_2 (nwords
, 0)));
2725 result
= build (CONSTRUCTOR
, type
, NULL_TREE
, nreverse (elts
));
2726 TREE_CONSTANT (result
) = 1;
2727 TREE_STATIC (result
) = 1;
2728 result
= build1 (INDIRECT_REF
, build_pointer_type (type
), result
);
2729 TREE_CONSTANT (result
) = 1;
2730 return expand_expr (result
, NULL_RTX
, VOIDmode
, EXPAND_MEMORY_USE_BAD
);
2734 /* Expand ARGLIST, from a call to __builtin_next_arg. */
2737 expand_builtin_next_arg (arglist
)
2740 tree fntype
= TREE_TYPE (current_function_decl
);
2742 if ((TYPE_ARG_TYPES (fntype
) == 0
2743 || (TREE_VALUE (tree_last (TYPE_ARG_TYPES (fntype
)))
2745 && ! current_function_varargs
)
2747 error ("`va_start' used in function with fixed args");
2753 tree last_parm
= tree_last (DECL_ARGUMENTS (current_function_decl
));
2754 tree arg
= TREE_VALUE (arglist
);
2756 /* Strip off all nops for the sake of the comparison. This
2757 is not quite the same as STRIP_NOPS. It does more.
2758 We must also strip off INDIRECT_EXPR for C++ reference
2760 while (TREE_CODE (arg
) == NOP_EXPR
2761 || TREE_CODE (arg
) == CONVERT_EXPR
2762 || TREE_CODE (arg
) == NON_LVALUE_EXPR
2763 || TREE_CODE (arg
) == INDIRECT_REF
)
2764 arg
= TREE_OPERAND (arg
, 0);
2765 if (arg
!= last_parm
)
2766 warning ("second parameter of `va_start' not last named argument");
2768 else if (! current_function_varargs
)
2769 /* Evidently an out of date version of <stdarg.h>; can't validate
2770 va_start's second argument, but can still work as intended. */
2771 warning ("`__builtin_next_arg' called without an argument");
2773 return expand_binop (Pmode
, add_optab
,
2774 current_function_internal_arg_pointer
,
2775 current_function_arg_offset_rtx
,
2776 NULL_RTX
, 0, OPTAB_LIB_WIDEN
);
2779 /* Make it easier for the backends by protecting the valist argument
2780 from multiple evaluations. */
2783 stabilize_va_list (valist
, needs_lvalue
)
2787 if (TREE_CODE (va_list_type_node
) == ARRAY_TYPE
)
2789 if (TREE_SIDE_EFFECTS (valist
))
2790 valist
= save_expr (valist
);
2792 /* For this case, the backends will be expecting a pointer to
2793 TREE_TYPE (va_list_type_node), but it's possible we've
2794 actually been given an array (an actual va_list_type_node).
2796 if (TREE_CODE (TREE_TYPE (valist
)) == ARRAY_TYPE
)
2798 tree p1
= build_pointer_type (TREE_TYPE (va_list_type_node
));
2799 tree p2
= build_pointer_type (va_list_type_node
);
2801 valist
= build1 (ADDR_EXPR
, p2
, valist
);
2802 valist
= fold (build1 (NOP_EXPR
, p1
, valist
));
2811 if (! TREE_SIDE_EFFECTS (valist
))
2814 pt
= build_pointer_type (va_list_type_node
);
2815 valist
= fold (build1 (ADDR_EXPR
, pt
, valist
));
2816 TREE_SIDE_EFFECTS (valist
) = 1;
2819 if (TREE_SIDE_EFFECTS (valist
))
2820 valist
= save_expr (valist
);
2821 valist
= fold (build1 (INDIRECT_REF
, TREE_TYPE (TREE_TYPE (valist
)),
2828 /* The "standard" implementation of va_start: just assign `nextarg' to
2832 std_expand_builtin_va_start (stdarg_p
, valist
, nextarg
)
2841 /* The dummy named parameter is declared as a 'word' sized
2842 object, but if a 'word' is smaller than an 'int', it would
2843 have been promoted to int when it was added to the arglist. */
2844 int align
= PARM_BOUNDARY
/ BITS_PER_UNIT
;
2845 int size
= MAX (UNITS_PER_WORD
,
2846 GET_MODE_SIZE (TYPE_MODE (integer_type_node
)));
2847 int offset
= ((size
+ align
- 1) / align
) * align
;
2848 nextarg
= plus_constant (nextarg
, -offset
);
2851 t
= build (MODIFY_EXPR
, TREE_TYPE (valist
), valist
,
2852 make_tree (ptr_type_node
, nextarg
));
2853 TREE_SIDE_EFFECTS (t
) = 1;
2855 expand_expr (t
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2858 /* Expand ARGLIST, which from a call to __builtin_stdarg_va_start or
2859 __builtin_varargs_va_start, depending on STDARG_P. */
2862 expand_builtin_va_start (stdarg_p
, arglist
)
2867 tree chain
= arglist
, valist
;
2870 nextarg
= expand_builtin_next_arg (chain
= TREE_CHAIN (arglist
));
2872 nextarg
= expand_builtin_next_arg (NULL_TREE
);
2874 if (TREE_CHAIN (chain
))
2875 error ("too many arguments to function `va_start'");
2877 valist
= stabilize_va_list (TREE_VALUE (arglist
), 1);
2879 #ifdef EXPAND_BUILTIN_VA_START
2880 EXPAND_BUILTIN_VA_START (stdarg_p
, valist
, nextarg
);
2882 std_expand_builtin_va_start (stdarg_p
, valist
, nextarg
);
2888 /* The "standard" implementation of va_arg: read the value from the
2889 current (padded) address and increment by the (padded) size. */
2892 std_expand_builtin_va_arg (valist
, type
)
2896 HOST_WIDE_INT align
;
2897 HOST_WIDE_INT rounded_size
;
2900 /* Compute the rounded size of the type. */
2901 align
= PARM_BOUNDARY
/ BITS_PER_UNIT
;
2902 rounded_size
= (((int_size_in_bytes (type
) + align
- 1) / align
) * align
);
2906 if (PAD_VARARGS_DOWN
)
2908 /* Small args are padded downward. */
2911 = rounded_size
> align
? rounded_size
: int_size_in_bytes (type
);
2913 addr_tree
= build (PLUS_EXPR
, TREE_TYPE (addr_tree
), addr_tree
,
2914 build_int_2 (rounded_size
- adj
, 0));
2917 addr
= expand_expr (addr_tree
, NULL_RTX
, Pmode
, EXPAND_NORMAL
);
2918 addr
= copy_to_reg (addr
);
2920 /* Compute new value for AP. */
2921 t
= build (MODIFY_EXPR
, TREE_TYPE (valist
), valist
,
2922 build (PLUS_EXPR
, TREE_TYPE (valist
), valist
,
2923 build_int_2 (rounded_size
, 0)));
2924 TREE_SIDE_EFFECTS (t
) = 1;
2925 expand_expr (t
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2930 /* Expand __builtin_va_arg, which is not really a builtin function, but
2931 a very special sort of operator. */
2934 expand_builtin_va_arg (valist
, type
)
2938 tree promoted_type
, want_va_type
, have_va_type
;
2940 /* Verify that valist is of the proper type. */
2942 want_va_type
= va_list_type_node
;
2943 have_va_type
= TREE_TYPE (valist
);
2944 if (TREE_CODE (want_va_type
) == ARRAY_TYPE
)
2946 /* If va_list is an array type, the argument may have decayed
2947 to a pointer type, e.g. by being passed to another function.
2948 In that case, unwrap both types so that we can compare the
2949 underlying records. */
2950 if (TREE_CODE (have_va_type
) == ARRAY_TYPE
2951 || TREE_CODE (have_va_type
) == POINTER_TYPE
)
2953 want_va_type
= TREE_TYPE (want_va_type
);
2954 have_va_type
= TREE_TYPE (have_va_type
);
2957 if (TYPE_MAIN_VARIANT (want_va_type
) != TYPE_MAIN_VARIANT (have_va_type
))
2959 error ("first argument to `va_arg' not of type `va_list'");
2963 /* Generate a diagnostic for requesting data of a type that cannot
2964 be passed through `...' due to type promotion at the call site. */
2965 else if ((promoted_type
= (*lang_type_promotes_to
) (type
)) != NULL_TREE
)
2967 const char *name
= "<anonymous type>", *pname
= 0;
2968 static int gave_help
;
2970 if (TYPE_NAME (type
))
2972 if (TREE_CODE (TYPE_NAME (type
)) == IDENTIFIER_NODE
)
2973 name
= IDENTIFIER_POINTER (TYPE_NAME (type
));
2974 else if (TREE_CODE (TYPE_NAME (type
)) == TYPE_DECL
2975 && DECL_NAME (TYPE_NAME (type
)))
2976 name
= IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type
)));
2978 if (TYPE_NAME (promoted_type
))
2980 if (TREE_CODE (TYPE_NAME (promoted_type
)) == IDENTIFIER_NODE
)
2981 pname
= IDENTIFIER_POINTER (TYPE_NAME (promoted_type
));
2982 else if (TREE_CODE (TYPE_NAME (promoted_type
)) == TYPE_DECL
2983 && DECL_NAME (TYPE_NAME (promoted_type
)))
2984 pname
= IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (promoted_type
)));
2987 error ("`%s' is promoted to `%s' when passed through `...'", name
, pname
);
2991 error ("(so you should pass `%s' not `%s' to `va_arg')", pname
, name
);
2998 /* Make it easier for the backends by protecting the valist argument
2999 from multiple evaluations. */
3000 valist
= stabilize_va_list (valist
, 0);
3002 #ifdef EXPAND_BUILTIN_VA_ARG
3003 addr
= EXPAND_BUILTIN_VA_ARG (valist
, type
);
3005 addr
= std_expand_builtin_va_arg (valist
, type
);
3009 #ifdef POINTERS_EXTEND_UNSIGNED
3010 if (GET_MODE (addr
) != Pmode
)
3011 addr
= convert_memory_address (Pmode
, addr
);
3014 result
= gen_rtx_MEM (TYPE_MODE (type
), addr
);
3015 set_mem_alias_set (result
, get_varargs_alias_set ());
3020 /* Expand ARGLIST, from a call to __builtin_va_end. */
3023 expand_builtin_va_end (arglist
)
3026 tree valist
= TREE_VALUE (arglist
);
3028 #ifdef EXPAND_BUILTIN_VA_END
3029 valist
= stabilize_va_list (valist
, 0);
3030 EXPAND_BUILTIN_VA_END(arglist
);
3032 /* Evaluate for side effects, if needed. I hate macros that don't
3034 if (TREE_SIDE_EFFECTS (valist
))
3035 expand_expr (valist
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
3041 /* Expand ARGLIST, from a call to __builtin_va_copy. We do this as a
3042 builtin rather than just as an assignment in stdarg.h because of the
3043 nastiness of array-type va_list types. */
3046 expand_builtin_va_copy (arglist
)
3051 dst
= TREE_VALUE (arglist
);
3052 src
= TREE_VALUE (TREE_CHAIN (arglist
));
3054 dst
= stabilize_va_list (dst
, 1);
3055 src
= stabilize_va_list (src
, 0);
3057 if (TREE_CODE (va_list_type_node
) != ARRAY_TYPE
)
3059 t
= build (MODIFY_EXPR
, va_list_type_node
, dst
, src
);
3060 TREE_SIDE_EFFECTS (t
) = 1;
3061 expand_expr (t
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
3065 rtx dstb
, srcb
, size
;
3067 /* Evaluate to pointers. */
3068 dstb
= expand_expr (dst
, NULL_RTX
, Pmode
, EXPAND_NORMAL
);
3069 srcb
= expand_expr (src
, NULL_RTX
, Pmode
, EXPAND_NORMAL
);
3070 size
= expand_expr (TYPE_SIZE_UNIT (va_list_type_node
), NULL_RTX
,
3071 VOIDmode
, EXPAND_NORMAL
);
3073 #ifdef POINTERS_EXTEND_UNSIGNED
3074 if (GET_MODE (dstb
) != Pmode
)
3075 dstb
= convert_memory_address (Pmode
, dstb
);
3077 if (GET_MODE (srcb
) != Pmode
)
3078 srcb
= convert_memory_address (Pmode
, srcb
);
3081 /* "Dereference" to BLKmode memories. */
3082 dstb
= gen_rtx_MEM (BLKmode
, dstb
);
3083 set_mem_alias_set (dstb
, get_alias_set (TREE_TYPE (TREE_TYPE (dst
))));
3084 set_mem_align (dstb
, TYPE_ALIGN (va_list_type_node
));
3085 srcb
= gen_rtx_MEM (BLKmode
, srcb
);
3086 set_mem_alias_set (srcb
, get_alias_set (TREE_TYPE (TREE_TYPE (src
))));
3087 set_mem_align (srcb
, TYPE_ALIGN (va_list_type_node
));
3090 emit_block_move (dstb
, srcb
, size
);
3096 /* Expand a call to one of the builtin functions __builtin_frame_address or
3097 __builtin_return_address. */
3100 expand_builtin_frame_address (exp
)
3103 tree fndecl
= TREE_OPERAND (TREE_OPERAND (exp
, 0), 0);
3104 tree arglist
= TREE_OPERAND (exp
, 1);
3106 /* The argument must be a nonnegative integer constant.
3107 It counts the number of frames to scan up the stack.
3108 The value is the return address saved in that frame. */
3110 /* Warning about missing arg was already issued. */
3112 else if (! host_integerp (TREE_VALUE (arglist
), 1))
3114 if (DECL_FUNCTION_CODE (fndecl
) == BUILT_IN_FRAME_ADDRESS
)
3115 error ("invalid arg to `__builtin_frame_address'");
3117 error ("invalid arg to `__builtin_return_address'");
3123 = expand_builtin_return_addr (DECL_FUNCTION_CODE (fndecl
),
3124 tree_low_cst (TREE_VALUE (arglist
), 1),
3125 hard_frame_pointer_rtx
);
3127 /* Some ports cannot access arbitrary stack frames. */
3130 if (DECL_FUNCTION_CODE (fndecl
) == BUILT_IN_FRAME_ADDRESS
)
3131 warning ("unsupported arg to `__builtin_frame_address'");
3133 warning ("unsupported arg to `__builtin_return_address'");
3137 /* For __builtin_frame_address, return what we've got. */
3138 if (DECL_FUNCTION_CODE (fndecl
) == BUILT_IN_FRAME_ADDRESS
)
3141 if (GET_CODE (tem
) != REG
3142 && ! CONSTANT_P (tem
))
3143 tem
= copy_to_mode_reg (Pmode
, tem
);
3148 /* Expand a call to the alloca builtin, with arguments ARGLIST. Return 0 if
3149 we failed and the caller should emit a normal call, otherwise try to get
3150 the result in TARGET, if convenient. */
3153 expand_builtin_alloca (arglist
, target
)
3160 if (!validate_arglist (arglist
, INTEGER_TYPE
, VOID_TYPE
))
3163 /* Compute the argument. */
3164 op0
= expand_expr (TREE_VALUE (arglist
), NULL_RTX
, VOIDmode
, 0);
3166 /* Allocate the desired space. */
3167 result
= allocate_dynamic_stack_space (op0
, target
, BITS_PER_UNIT
);
3169 #ifdef POINTERS_EXTEND_UNSIGNED
3170 if (GET_MODE (result
) != ptr_mode
)
3171 result
= convert_memory_address (ptr_mode
, result
);
3177 /* Expand a call to the ffs builtin. The arguments are in ARGLIST.
3178 Return 0 if a normal call should be emitted rather than expanding the
3179 function in-line. If convenient, the result should be placed in TARGET.
3180 SUBTARGET may be used as the target for computing one of EXP's operands. */
3183 expand_builtin_ffs (arglist
, target
, subtarget
)
3185 rtx target
, subtarget
;
3188 if (!validate_arglist (arglist
, INTEGER_TYPE
, VOID_TYPE
))
3191 /* Compute the argument. */
3192 op0
= expand_expr (TREE_VALUE (arglist
), subtarget
, VOIDmode
, 0);
3193 /* Compute ffs, into TARGET if possible.
3194 Set TARGET to wherever the result comes back. */
3195 target
= expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist
))),
3196 ffs_optab
, op0
, target
, 1);
3202 /* If the string passed to fputs is a constant and is one character
3203 long, we attempt to transform this call into __builtin_fputc(). */
3206 expand_builtin_fputs (arglist
, ignore
)
3210 tree len
, fn
, fn_fputc
= built_in_decls
[BUILT_IN_FPUTC
],
3211 fn_fwrite
= built_in_decls
[BUILT_IN_FWRITE
];
3213 /* If the return value is used, or the replacement _DECL isn't
3214 initialized, don't do the transformation. */
3215 if (!ignore
|| !fn_fputc
|| !fn_fwrite
)
3218 /* Verify the arguments in the original call. */
3219 if (!validate_arglist (arglist
, POINTER_TYPE
, POINTER_TYPE
, VOID_TYPE
)
3220 || current_function_check_memory_usage
)
3223 /* Get the length of the string passed to fputs. If the length
3224 can't be determined, punt. */
3225 if (!(len
= c_strlen (TREE_VALUE (arglist
)))
3226 || TREE_CODE (len
) != INTEGER_CST
)
3229 switch (compare_tree_int (len
, 1))
3231 case -1: /* length is 0, delete the call entirely . */
3233 /* Evaluate and ignore the argument in case it has
3235 expand_expr (TREE_VALUE (TREE_CHAIN (arglist
)), const0_rtx
,
3236 VOIDmode
, EXPAND_NORMAL
);
3239 case 0: /* length is 1, call fputc. */
3241 const char *p
= c_getstr (TREE_VALUE (arglist
));
3245 /* New argument list transforming fputs(string, stream) to
3246 fputc(string[0], stream). */
3248 build_tree_list (NULL_TREE
, TREE_VALUE (TREE_CHAIN (arglist
)));
3250 tree_cons (NULL_TREE
, build_int_2 (p
[0], 0), arglist
);
3256 case 1: /* length is greater than 1, call fwrite. */
3258 tree string_arg
= TREE_VALUE (arglist
);
3260 /* New argument list transforming fputs(string, stream) to
3261 fwrite(string, 1, len, stream). */
3262 arglist
= build_tree_list (NULL_TREE
, TREE_VALUE (TREE_CHAIN (arglist
)));
3263 arglist
= tree_cons (NULL_TREE
, len
, arglist
);
3264 arglist
= tree_cons (NULL_TREE
, size_one_node
, arglist
);
3265 arglist
= tree_cons (NULL_TREE
, string_arg
, arglist
);
3273 return expand_expr (build_function_call_expr (fn
, arglist
),
3274 (ignore
? const0_rtx
: NULL_RTX
),
3275 VOIDmode
, EXPAND_NORMAL
);
3278 /* Expand a call to __builtin_expect. We return our argument and emit a
3279 NOTE_INSN_EXPECTED_VALUE note. This is the expansion of __builtin_expect in
3280 a non-jump context. */
3283 expand_builtin_expect (arglist
, target
)
3290 if (arglist
== NULL_TREE
3291 || TREE_CHAIN (arglist
) == NULL_TREE
)
3293 exp
= TREE_VALUE (arglist
);
3294 c
= TREE_VALUE (TREE_CHAIN (arglist
));
3296 if (TREE_CODE (c
) != INTEGER_CST
)
3298 error ("second arg to `__builtin_expect' must be a constant");
3299 c
= integer_zero_node
;
3302 target
= expand_expr (exp
, target
, VOIDmode
, EXPAND_NORMAL
);
3304 /* Don't bother with expected value notes for integral constants. */
3305 if (GET_CODE (target
) != CONST_INT
)
3307 /* We do need to force this into a register so that we can be
3308 moderately sure to be able to correctly interpret the branch
3310 target
= force_reg (GET_MODE (target
), target
);
3312 rtx_c
= expand_expr (c
, NULL_RTX
, GET_MODE (target
), EXPAND_NORMAL
);
3314 note
= emit_note (NULL
, NOTE_INSN_EXPECTED_VALUE
);
3315 NOTE_EXPECTED_VALUE (note
) = gen_rtx_EQ (VOIDmode
, target
, rtx_c
);
3321 /* Like expand_builtin_expect, except do this in a jump context. This is
3322 called from do_jump if the conditional is a __builtin_expect. Return either
3323 a SEQUENCE of insns to emit the jump or NULL if we cannot optimize
3324 __builtin_expect. We need to optimize this at jump time so that machines
3325 like the PowerPC don't turn the test into a SCC operation, and then jump
3326 based on the test being 0/1. */
3329 expand_builtin_expect_jump (exp
, if_false_label
, if_true_label
)
3334 tree arglist
= TREE_OPERAND (exp
, 1);
3335 tree arg0
= TREE_VALUE (arglist
);
3336 tree arg1
= TREE_VALUE (TREE_CHAIN (arglist
));
3339 /* Only handle __builtin_expect (test, 0) and
3340 __builtin_expect (test, 1). */
3341 if (TREE_CODE (TREE_TYPE (arg1
)) == INTEGER_TYPE
3342 && (integer_zerop (arg1
) || integer_onep (arg1
)))
3347 /* If we fail to locate an appropriate conditional jump, we'll
3348 fall back to normal evaluation. Ensure that the expression
3349 can be re-evaluated. */
3350 switch (unsafe_for_reeval (arg0
))
3355 case 1: /* Mildly unsafe. */
3356 arg0
= unsave_expr (arg0
);
3359 case 2: /* Wildly unsafe. */
3363 /* Expand the jump insns. */
3365 do_jump (arg0
, if_false_label
, if_true_label
);
3366 ret
= gen_sequence ();
3369 /* Now that the __builtin_expect has been validated, go through and add
3370 the expect's to each of the conditional jumps. If we run into an
3371 error, just give up and generate the 'safe' code of doing a SCC
3372 operation and then doing a branch on that. */
3373 for (j
= 0; j
< XVECLEN (ret
, 0); j
++)
3375 rtx insn
= XVECEXP (ret
, 0, j
);
3378 if (GET_CODE (insn
) == JUMP_INSN
&& any_condjump_p (insn
)
3379 && (pattern
= pc_set (insn
)) != NULL_RTX
)
3381 rtx ifelse
= SET_SRC (pattern
);
3385 if (GET_CODE (ifelse
) != IF_THEN_ELSE
)
3388 if (GET_CODE (XEXP (ifelse
, 1)) == LABEL_REF
)
3391 label
= XEXP (XEXP (ifelse
, 1), 0);
3393 /* An inverted jump reverses the probabilities. */
3394 else if (GET_CODE (XEXP (ifelse
, 2)) == LABEL_REF
)
3397 label
= XEXP (XEXP (ifelse
, 2), 0);
3399 /* We shouldn't have to worry about conditional returns during
3400 the expansion stage, but handle it gracefully anyway. */
3401 else if (GET_CODE (XEXP (ifelse
, 1)) == RETURN
)
3406 /* An inverted return reverses the probabilities. */
3407 else if (GET_CODE (XEXP (ifelse
, 2)) == RETURN
)
3415 /* If the test is expected to fail, reverse the
3417 if (integer_zerop (arg1
))
3420 /* If we are jumping to the false label, reverse the
3422 if (label
== NULL_RTX
)
3423 ; /* conditional return */
3424 else if (label
== if_false_label
)
3426 else if (label
!= if_true_label
)
3430 predict_insn_def (insn
, PRED_BUILTIN_EXPECT
, taken
);
3434 /* If no jumps were modified, fail and do __builtin_expect the normal
3443 /* Expand an expression EXP that calls a built-in function,
3444 with result going to TARGET if that's convenient
3445 (and in mode MODE if that's convenient).
3446 SUBTARGET may be used as the target for computing one of EXP's operands.
3447 IGNORE is nonzero if the value is to be ignored. */
3450 expand_builtin (exp
, target
, subtarget
, mode
, ignore
)
3454 enum machine_mode mode
;
3457 tree fndecl
= TREE_OPERAND (TREE_OPERAND (exp
, 0), 0);
3458 tree arglist
= TREE_OPERAND (exp
, 1);
3459 enum built_in_function fcode
= DECL_FUNCTION_CODE (fndecl
);
3461 if (DECL_BUILT_IN_CLASS (fndecl
) == BUILT_IN_MD
)
3462 return (*targetm
.expand_builtin
) (exp
, target
, subtarget
, mode
, ignore
);
3464 /* When not optimizing, generate calls to library functions for a certain
3466 if (! optimize
&& ! CALLED_AS_BUILT_IN (fndecl
)
3467 && (fcode
== BUILT_IN_SIN
|| fcode
== BUILT_IN_COS
3468 || fcode
== BUILT_IN_FSQRT
|| fcode
== BUILT_IN_SQRTF
3469 || fcode
== BUILT_IN_SQRTL
|| fcode
== BUILT_IN_MEMSET
3470 || fcode
== BUILT_IN_MEMCPY
|| fcode
== BUILT_IN_MEMCMP
3471 || fcode
== BUILT_IN_BCMP
|| fcode
== BUILT_IN_BZERO
3472 || fcode
== BUILT_IN_INDEX
|| fcode
== BUILT_IN_RINDEX
3473 || fcode
== BUILT_IN_STRCHR
|| fcode
== BUILT_IN_STRRCHR
3474 || fcode
== BUILT_IN_STRLEN
|| fcode
== BUILT_IN_STRCPY
3475 || fcode
== BUILT_IN_STRNCPY
|| fcode
== BUILT_IN_STRNCMP
3476 || fcode
== BUILT_IN_STRSTR
|| fcode
== BUILT_IN_STRPBRK
3477 || fcode
== BUILT_IN_STRCAT
|| fcode
== BUILT_IN_STRNCAT
3478 || fcode
== BUILT_IN_STRSPN
|| fcode
== BUILT_IN_STRCSPN
3479 || fcode
== BUILT_IN_STRCMP
|| fcode
== BUILT_IN_FFS
3480 || fcode
== BUILT_IN_PUTCHAR
|| fcode
== BUILT_IN_PUTS
3481 || fcode
== BUILT_IN_PRINTF
|| fcode
== BUILT_IN_FPUTC
3482 || fcode
== BUILT_IN_FPUTS
|| fcode
== BUILT_IN_FWRITE
))
3483 return expand_call (exp
, target
, ignore
);
3489 case BUILT_IN_LLABS
:
3490 case BUILT_IN_IMAXABS
:
3492 case BUILT_IN_FABSF
:
3493 case BUILT_IN_FABSL
:
3494 /* build_function_call changes these into ABS_EXPR. */
3498 case BUILT_IN_CONJF
:
3499 case BUILT_IN_CONJL
:
3500 case BUILT_IN_CREAL
:
3501 case BUILT_IN_CREALF
:
3502 case BUILT_IN_CREALL
:
3503 case BUILT_IN_CIMAG
:
3504 case BUILT_IN_CIMAGF
:
3505 case BUILT_IN_CIMAGL
:
3506 /* expand_tree_builtin changes these into CONJ_EXPR, REALPART_EXPR
3507 and IMAGPART_EXPR. */
3516 /* Treat these like sqrt only if unsafe math optimizations are allowed,
3517 because of possible accuracy problems. */
3518 if (! flag_unsafe_math_optimizations
)
3520 case BUILT_IN_FSQRT
:
3521 case BUILT_IN_SQRTF
:
3522 case BUILT_IN_SQRTL
:
3523 target
= expand_builtin_mathfn (exp
, target
, subtarget
);
3531 case BUILT_IN_APPLY_ARGS
:
3532 return expand_builtin_apply_args ();
3534 /* __builtin_apply (FUNCTION, ARGUMENTS, ARGSIZE) invokes
3535 FUNCTION with a copy of the parameters described by
3536 ARGUMENTS, and ARGSIZE. It returns a block of memory
3537 allocated on the stack into which is stored all the registers
3538 that might possibly be used for returning the result of a
3539 function. ARGUMENTS is the value returned by
3540 __builtin_apply_args. ARGSIZE is the number of bytes of
3541 arguments that must be copied. ??? How should this value be
3542 computed? We'll also need a safe worst case value for varargs
3544 case BUILT_IN_APPLY
:
3545 if (!validate_arglist (arglist
, POINTER_TYPE
,
3546 POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
)
3547 && !validate_arglist (arglist
, REFERENCE_TYPE
,
3548 POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
3556 for (t
= arglist
, i
= 0; t
; t
= TREE_CHAIN (t
), i
++)
3557 ops
[i
] = expand_expr (TREE_VALUE (t
), NULL_RTX
, VOIDmode
, 0);
3559 return expand_builtin_apply (ops
[0], ops
[1], ops
[2]);
3562 /* __builtin_return (RESULT) causes the function to return the
3563 value described by RESULT. RESULT is address of the block of
3564 memory returned by __builtin_apply. */
3565 case BUILT_IN_RETURN
:
3566 if (validate_arglist (arglist
, POINTER_TYPE
, VOID_TYPE
))
3567 expand_builtin_return (expand_expr (TREE_VALUE (arglist
),
3568 NULL_RTX
, VOIDmode
, 0));
3571 case BUILT_IN_SAVEREGS
:
3572 return expand_builtin_saveregs ();
3574 case BUILT_IN_ARGS_INFO
:
3575 return expand_builtin_args_info (exp
);
3577 /* Return the address of the first anonymous stack arg. */
3578 case BUILT_IN_NEXT_ARG
:
3579 return expand_builtin_next_arg (arglist
);
3581 case BUILT_IN_CLASSIFY_TYPE
:
3582 return expand_builtin_classify_type (arglist
);
3584 case BUILT_IN_CONSTANT_P
:
3585 return expand_builtin_constant_p (exp
);
3587 case BUILT_IN_FRAME_ADDRESS
:
3588 case BUILT_IN_RETURN_ADDRESS
:
3589 return expand_builtin_frame_address (exp
);
3591 /* Returns the address of the area where the structure is returned.
3593 case BUILT_IN_AGGREGATE_INCOMING_ADDRESS
:
3595 || ! AGGREGATE_TYPE_P (TREE_TYPE (TREE_TYPE (current_function_decl
)))
3596 || GET_CODE (DECL_RTL (DECL_RESULT (current_function_decl
))) != MEM
)
3599 return XEXP (DECL_RTL (DECL_RESULT (current_function_decl
)), 0);
3601 case BUILT_IN_ALLOCA
:
3602 target
= expand_builtin_alloca (arglist
, target
);
3608 target
= expand_builtin_ffs (arglist
, target
, subtarget
);
3613 case BUILT_IN_STRLEN
:
3614 target
= expand_builtin_strlen (exp
, target
);
3619 case BUILT_IN_STRCPY
:
3620 target
= expand_builtin_strcpy (exp
);
3625 case BUILT_IN_STRNCPY
:
3626 target
= expand_builtin_strncpy (arglist
, target
, mode
);
3631 case BUILT_IN_STRCAT
:
3632 target
= expand_builtin_strcat (arglist
, target
, mode
);
3637 case BUILT_IN_STRNCAT
:
3638 target
= expand_builtin_strncat (arglist
, target
, mode
);
3643 case BUILT_IN_STRSPN
:
3644 target
= expand_builtin_strspn (arglist
, target
, mode
);
3649 case BUILT_IN_STRCSPN
:
3650 target
= expand_builtin_strcspn (arglist
, target
, mode
);
3655 case BUILT_IN_STRSTR
:
3656 target
= expand_builtin_strstr (arglist
, target
, mode
);
3661 case BUILT_IN_STRPBRK
:
3662 target
= expand_builtin_strpbrk (arglist
, target
, mode
);
3667 case BUILT_IN_INDEX
:
3668 case BUILT_IN_STRCHR
:
3669 target
= expand_builtin_strchr (arglist
, target
, mode
);
3674 case BUILT_IN_RINDEX
:
3675 case BUILT_IN_STRRCHR
:
3676 target
= expand_builtin_strrchr (arglist
, target
, mode
);
3681 case BUILT_IN_MEMCPY
:
3682 target
= expand_builtin_memcpy (arglist
);
3687 case BUILT_IN_MEMSET
:
3688 target
= expand_builtin_memset (exp
);
3693 case BUILT_IN_BZERO
:
3694 target
= expand_builtin_bzero (exp
);
3699 case BUILT_IN_STRCMP
:
3700 target
= expand_builtin_strcmp (exp
, target
, mode
);
3705 case BUILT_IN_STRNCMP
:
3706 target
= expand_builtin_strncmp (exp
, target
, mode
);
3711 /* These comparison functions need an instruction that returns an actual
3712 index. An ordinary compare that just sets the condition codes
3714 #ifdef HAVE_cmpstrsi
3716 case BUILT_IN_MEMCMP
:
3717 target
= expand_builtin_memcmp (exp
, arglist
, target
);
3723 case BUILT_IN_MEMCMP
:
3727 case BUILT_IN_SETJMP
:
3728 target
= expand_builtin_setjmp (arglist
, target
);
3733 /* __builtin_longjmp is passed a pointer to an array of five words.
3734 It's similar to the C library longjmp function but works with
3735 __builtin_setjmp above. */
3736 case BUILT_IN_LONGJMP
:
3737 if (!validate_arglist (arglist
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
3741 rtx buf_addr
= expand_expr (TREE_VALUE (arglist
), subtarget
,
3743 rtx value
= expand_expr (TREE_VALUE (TREE_CHAIN (arglist
)),
3744 NULL_RTX
, VOIDmode
, 0);
3746 if (value
!= const1_rtx
)
3748 error ("__builtin_longjmp second argument must be 1");
3752 expand_builtin_longjmp (buf_addr
, value
);
3759 emit_insn (gen_trap ());
3762 error ("__builtin_trap not supported by this target");
3766 case BUILT_IN_PUTCHAR
:
3768 case BUILT_IN_FPUTC
:
3769 case BUILT_IN_FWRITE
:
3771 case BUILT_IN_FPUTS
:
3772 target
= expand_builtin_fputs (arglist
, ignore
);
3777 /* Various hooks for the DWARF 2 __throw routine. */
3778 case BUILT_IN_UNWIND_INIT
:
3779 expand_builtin_unwind_init ();
3781 case BUILT_IN_DWARF_CFA
:
3782 return virtual_cfa_rtx
;
3783 #ifdef DWARF2_UNWIND_INFO
3784 case BUILT_IN_DWARF_FP_REGNUM
:
3785 return expand_builtin_dwarf_fp_regnum ();
3786 case BUILT_IN_INIT_DWARF_REG_SIZES
:
3787 expand_builtin_init_dwarf_reg_sizes (TREE_VALUE (arglist
));
3790 case BUILT_IN_FROB_RETURN_ADDR
:
3791 return expand_builtin_frob_return_addr (TREE_VALUE (arglist
));
3792 case BUILT_IN_EXTRACT_RETURN_ADDR
:
3793 return expand_builtin_extract_return_addr (TREE_VALUE (arglist
));
3794 case BUILT_IN_EH_RETURN
:
3795 expand_builtin_eh_return (TREE_VALUE (arglist
),
3796 TREE_VALUE (TREE_CHAIN (arglist
)));
3798 #ifdef EH_RETURN_DATA_REGNO
3799 case BUILT_IN_EH_RETURN_DATA_REGNO
:
3800 return expand_builtin_eh_return_data_regno (arglist
);
3802 case BUILT_IN_VARARGS_START
:
3803 return expand_builtin_va_start (0, arglist
);
3804 case BUILT_IN_STDARG_START
:
3805 return expand_builtin_va_start (1, arglist
);
3806 case BUILT_IN_VA_END
:
3807 return expand_builtin_va_end (arglist
);
3808 case BUILT_IN_VA_COPY
:
3809 return expand_builtin_va_copy (arglist
);
3810 case BUILT_IN_EXPECT
:
3811 return expand_builtin_expect (arglist
, target
);
3813 default: /* just do library call, if unknown builtin */
3814 error ("built-in function `%s' not currently supported",
3815 IDENTIFIER_POINTER (DECL_NAME (fndecl
)));
3818 /* The switch statement above can drop through to cause the function
3819 to be called normally. */
3820 return expand_call (exp
, target
, ignore
);
3823 /* Fold a call to __builtin_constant_p, if we know it will evaluate to a
3824 constant. ARGLIST is the argument list of the call. */
3827 fold_builtin_constant_p (arglist
)
3833 arglist
= TREE_VALUE (arglist
);
3835 /* We return 1 for a numeric type that's known to be a constant
3836 value at compile-time or for an aggregate type that's a
3837 literal constant. */
3838 STRIP_NOPS (arglist
);
3840 /* If we know this is a constant, emit the constant of one. */
3841 if (TREE_CODE_CLASS (TREE_CODE (arglist
)) == 'c'
3842 || (TREE_CODE (arglist
) == CONSTRUCTOR
3843 && TREE_CONSTANT (arglist
))
3844 || (TREE_CODE (arglist
) == ADDR_EXPR
3845 && TREE_CODE (TREE_OPERAND (arglist
, 0)) == STRING_CST
))
3846 return integer_one_node
;
3848 /* If we aren't going to be running CSE or this expression
3849 has side effects, show we don't know it to be a constant.
3850 Likewise if it's a pointer or aggregate type since in those
3851 case we only want literals, since those are only optimized
3852 when generating RTL, not later.
3853 And finally, if we are compiling an initializer, not code, we
3854 need to return a definite result now; there's not going to be any
3855 more optimization done. */
3856 if (TREE_SIDE_EFFECTS (arglist
) || cse_not_expected
3857 || AGGREGATE_TYPE_P (TREE_TYPE (arglist
))
3858 || POINTER_TYPE_P (TREE_TYPE (arglist
))
3860 return integer_zero_node
;
3865 /* Fold a call to __builtin_classify_type. */
3868 fold_builtin_classify_type (arglist
)
3872 return build_int_2 (no_type_class
, 0);
3874 return build_int_2 (type_to_class (TREE_TYPE (TREE_VALUE (arglist
))), 0);
3877 /* Used by constant folding to eliminate some builtin calls early. EXP is
3878 the CALL_EXPR of a call to a builtin function. */
3884 tree fndecl
= TREE_OPERAND (TREE_OPERAND (exp
, 0), 0);
3885 tree arglist
= TREE_OPERAND (exp
, 1);
3886 enum built_in_function fcode
= DECL_FUNCTION_CODE (fndecl
);
3888 if (DECL_BUILT_IN_CLASS (fndecl
) == BUILT_IN_MD
)
3893 case BUILT_IN_CONSTANT_P
:
3894 return fold_builtin_constant_p (arglist
);
3896 case BUILT_IN_CLASSIFY_TYPE
:
3897 return fold_builtin_classify_type (arglist
);
3899 case BUILT_IN_STRLEN
:
3900 if (validate_arglist (arglist
, POINTER_TYPE
, VOID_TYPE
))
3902 tree len
= c_strlen (TREE_VALUE (arglist
));
3916 build_function_call_expr (fn
, arglist
)
3921 call_expr
= build1 (ADDR_EXPR
, build_pointer_type (TREE_TYPE (fn
)), fn
);
3922 call_expr
= build (CALL_EXPR
, TREE_TYPE (TREE_TYPE (fn
)),
3923 call_expr
, arglist
);
3924 TREE_SIDE_EFFECTS (call_expr
) = 1;
3925 return fold (call_expr
);
3928 /* This function validates the types of a function call argument list
3929 represented as a tree chain of parameters against a specified list
3930 of tree_codes. If the last specifier is a 0, that represents an
3931 ellipses, otherwise the last specifier must be a VOID_TYPE. */
3934 validate_arglist
VPARAMS ((tree arglist
, ...))
3936 enum tree_code code
;
3939 VA_OPEN (ap
, arglist
);
3940 VA_FIXEDARG (ap
, tree
, arglist
);
3943 code
= va_arg (ap
, enum tree_code
);
3947 /* This signifies an ellipses, any further arguments are all ok. */
3951 /* This signifies an endlink, if no arguments remain, return
3952 true, otherwise return false. */
3956 /* If no parameters remain or the parameter's code does not
3957 match the specified code, return false. Otherwise continue
3958 checking any remaining arguments. */
3959 if (arglist
== 0 || code
!= TREE_CODE (TREE_TYPE (TREE_VALUE (arglist
))))
3963 arglist
= TREE_CHAIN (arglist
);
3966 /* We need gotos here since we can only have one VA_CLOSE in a
3974 /* Default version of target-specific builtin setup that does nothing. */
3977 default_init_builtins ()
3981 /* Default target-specific builtin expander that does nothing. */
3984 default_expand_builtin (exp
, target
, subtarget
, mode
, ignore
)
3985 tree exp ATTRIBUTE_UNUSED
;
3986 rtx target ATTRIBUTE_UNUSED
;
3987 rtx subtarget ATTRIBUTE_UNUSED
;
3988 enum machine_mode mode ATTRIBUTE_UNUSED
;
3989 int ignore ATTRIBUTE_UNUSED
;