1 /* Expand builtin functions.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
30 #include "hard-reg-set.h"
33 #include "insn-config.h"
39 #include "typeclass.h"
45 #define CALLED_AS_BUILT_IN(NODE) \
46 (!strncmp (IDENTIFIER_POINTER (DECL_NAME (NODE)), "__builtin_", 10))
48 /* Register mappings for target machines without register windows. */
49 #ifndef INCOMING_REGNO
50 #define INCOMING_REGNO(OUT) (OUT)
52 #ifndef OUTGOING_REGNO
53 #define OUTGOING_REGNO(IN) (IN)
56 #ifndef PAD_VARARGS_DOWN
57 #define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
60 /* Define the names of the builtin function types and codes. */
61 const char *const built_in_class_names
[4]
62 = {"NOT_BUILT_IN", "BUILT_IN_FRONTEND", "BUILT_IN_MD", "BUILT_IN_NORMAL"};
64 #define DEF_BUILTIN(X, N, C, T, LT, B, F, NA) STRINGX(X),
65 const char *const built_in_names
[(int) END_BUILTINS
] =
67 #include "builtins.def"
71 /* Setup an array of _DECL trees, make sure each element is
72 initialized to NULL_TREE. */
73 tree built_in_decls
[(int) END_BUILTINS
];
75 tree (*lang_type_promotes_to
) PARAMS ((tree
));
77 static int get_pointer_alignment
PARAMS ((tree
, unsigned int));
78 static tree c_strlen
PARAMS ((tree
));
79 static const char *c_getstr
PARAMS ((tree
));
80 static rtx c_readstr
PARAMS ((const char *,
82 static int target_char_cast
PARAMS ((tree
, char *));
83 static rtx get_memory_rtx
PARAMS ((tree
));
84 static int apply_args_size
PARAMS ((void));
85 static int apply_result_size
PARAMS ((void));
86 #if defined (HAVE_untyped_call) || defined (HAVE_untyped_return)
87 static rtx result_vector
PARAMS ((int, rtx
));
89 static rtx expand_builtin_setjmp
PARAMS ((tree
, rtx
));
90 static void expand_builtin_prefetch
PARAMS ((tree
));
91 static rtx expand_builtin_apply_args
PARAMS ((void));
92 static rtx expand_builtin_apply_args_1
PARAMS ((void));
93 static rtx expand_builtin_apply
PARAMS ((rtx
, rtx
, rtx
));
94 static void expand_builtin_return
PARAMS ((rtx
));
95 static enum type_class type_to_class
PARAMS ((tree
));
96 static rtx expand_builtin_classify_type
PARAMS ((tree
));
97 static rtx expand_builtin_mathfn
PARAMS ((tree
, rtx
, rtx
));
98 static rtx expand_builtin_constant_p
PARAMS ((tree
));
99 static rtx expand_builtin_args_info
PARAMS ((tree
));
100 static rtx expand_builtin_next_arg
PARAMS ((tree
));
101 static rtx expand_builtin_va_start
PARAMS ((int, tree
));
102 static rtx expand_builtin_va_end
PARAMS ((tree
));
103 static rtx expand_builtin_va_copy
PARAMS ((tree
));
104 static rtx expand_builtin_memcmp
PARAMS ((tree
, tree
, rtx
,
106 static rtx expand_builtin_strcmp
PARAMS ((tree
, rtx
,
108 static rtx expand_builtin_strncmp
PARAMS ((tree
, rtx
,
110 static rtx builtin_memcpy_read_str
PARAMS ((PTR
, HOST_WIDE_INT
,
112 static rtx expand_builtin_strcat
PARAMS ((tree
, rtx
,
114 static rtx expand_builtin_strncat
PARAMS ((tree
, rtx
,
116 static rtx expand_builtin_strspn
PARAMS ((tree
, rtx
,
118 static rtx expand_builtin_strcspn
PARAMS ((tree
, rtx
,
120 static rtx expand_builtin_memcpy
PARAMS ((tree
, rtx
,
122 static rtx expand_builtin_strcpy
PARAMS ((tree
, rtx
,
124 static rtx builtin_strncpy_read_str
PARAMS ((PTR
, HOST_WIDE_INT
,
126 static rtx expand_builtin_strncpy
PARAMS ((tree
, rtx
,
128 static rtx builtin_memset_read_str
PARAMS ((PTR
, HOST_WIDE_INT
,
130 static rtx expand_builtin_memset
PARAMS ((tree
, rtx
,
132 static rtx expand_builtin_bzero
PARAMS ((tree
));
133 static rtx expand_builtin_strlen
PARAMS ((tree
, rtx
));
134 static rtx expand_builtin_strstr
PARAMS ((tree
, rtx
,
136 static rtx expand_builtin_strpbrk
PARAMS ((tree
, rtx
,
138 static rtx expand_builtin_strchr
PARAMS ((tree
, rtx
,
140 static rtx expand_builtin_strrchr
PARAMS ((tree
, rtx
,
142 static rtx expand_builtin_alloca
PARAMS ((tree
, rtx
));
143 static rtx expand_builtin_ffs
PARAMS ((tree
, rtx
, rtx
));
144 static rtx expand_builtin_frame_address
PARAMS ((tree
));
145 static rtx expand_builtin_fputs
PARAMS ((tree
, int));
146 static tree stabilize_va_list
PARAMS ((tree
, int));
147 static rtx expand_builtin_expect
PARAMS ((tree
, rtx
));
148 static tree fold_builtin_constant_p
PARAMS ((tree
));
149 static tree fold_builtin_classify_type
PARAMS ((tree
));
150 static tree build_function_call_expr
PARAMS ((tree
, tree
));
151 static int validate_arglist
PARAMS ((tree
, ...));
153 /* Return the alignment in bits of EXP, a pointer valued expression.
154 But don't return more than MAX_ALIGN no matter what.
155 The alignment returned is, by default, the alignment of the thing that
156 EXP points to. If it is not a POINTER_TYPE, 0 is returned.
158 Otherwise, look at the expression to see if we can do better, i.e., if the
159 expression is actually pointing at an object whose alignment is tighter. */
162 get_pointer_alignment (exp
, max_align
)
164 unsigned int max_align
;
166 unsigned int align
, inner
;
168 if (TREE_CODE (TREE_TYPE (exp
)) != POINTER_TYPE
)
171 align
= TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp
)));
172 align
= MIN (align
, max_align
);
176 switch (TREE_CODE (exp
))
180 case NON_LVALUE_EXPR
:
181 exp
= TREE_OPERAND (exp
, 0);
182 if (TREE_CODE (TREE_TYPE (exp
)) != POINTER_TYPE
)
185 inner
= TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp
)));
186 align
= MIN (inner
, max_align
);
190 /* If sum of pointer + int, restrict our maximum alignment to that
191 imposed by the integer. If not, we can't do any better than
193 if (! host_integerp (TREE_OPERAND (exp
, 1), 1))
196 while (((tree_low_cst (TREE_OPERAND (exp
, 1), 1))
197 & (max_align
/ BITS_PER_UNIT
- 1))
201 exp
= TREE_OPERAND (exp
, 0);
205 /* See what we are pointing at and look at its alignment. */
206 exp
= TREE_OPERAND (exp
, 0);
207 if (TREE_CODE (exp
) == FUNCTION_DECL
)
208 align
= FUNCTION_BOUNDARY
;
209 else if (DECL_P (exp
))
210 align
= DECL_ALIGN (exp
);
211 #ifdef CONSTANT_ALIGNMENT
212 else if (TREE_CODE_CLASS (TREE_CODE (exp
)) == 'c')
213 align
= CONSTANT_ALIGNMENT (exp
, align
);
215 return MIN (align
, max_align
);
223 /* Compute the length of a C string. TREE_STRING_LENGTH is not the right
224 way, because it could contain a zero byte in the middle.
225 TREE_STRING_LENGTH is the size of the character array, not the string.
227 The value returned is of type `ssizetype'.
229 Unfortunately, string_constant can't access the values of const char
230 arrays with initializers, so neither can we do so here. */
237 HOST_WIDE_INT offset
;
241 src
= string_constant (src
, &offset_node
);
245 max
= TREE_STRING_LENGTH (src
) - 1;
246 ptr
= TREE_STRING_POINTER (src
);
248 if (offset_node
&& TREE_CODE (offset_node
) != INTEGER_CST
)
250 /* If the string has an internal zero byte (e.g., "foo\0bar"), we can't
251 compute the offset to the following null if we don't know where to
252 start searching for it. */
255 for (i
= 0; i
< max
; i
++)
259 /* We don't know the starting offset, but we do know that the string
260 has no internal zero bytes. We can assume that the offset falls
261 within the bounds of the string; otherwise, the programmer deserves
262 what he gets. Subtract the offset from the length of the string,
263 and return that. This would perhaps not be valid if we were dealing
264 with named arrays in addition to literal string constants. */
266 return size_diffop (size_int (max
), offset_node
);
269 /* We have a known offset into the string. Start searching there for
270 a null character if we can represent it as a single HOST_WIDE_INT. */
271 if (offset_node
== 0)
273 else if (! host_integerp (offset_node
, 0))
276 offset
= tree_low_cst (offset_node
, 0);
278 /* If the offset is known to be out of bounds, warn, and call strlen at
280 if (offset
< 0 || offset
> max
)
282 warning ("offset outside bounds of constant string");
286 /* Use strlen to search for the first zero byte. Since any strings
287 constructed with build_string will have nulls appended, we win even
288 if we get handed something like (char[4])"abcd".
290 Since OFFSET is our starting index into the string, no further
291 calculation is needed. */
292 return ssize_int (strlen (ptr
+ offset
));
295 /* Return a char pointer for a C string if it is a string constant
296 or sum of string constant and integer constant. */
304 src
= string_constant (src
, &offset_node
);
308 if (offset_node
== 0)
309 return TREE_STRING_POINTER (src
);
310 else if (!host_integerp (offset_node
, 1)
311 || compare_tree_int (offset_node
, TREE_STRING_LENGTH (src
) - 1) > 0)
314 return TREE_STRING_POINTER (src
) + tree_low_cst (offset_node
, 1);
317 /* Return a CONST_INT or CONST_DOUBLE corresponding to target reading
318 GET_MODE_BITSIZE (MODE) bits from string constant STR. */
321 c_readstr (str
, mode
)
323 enum machine_mode mode
;
329 if (GET_MODE_CLASS (mode
) != MODE_INT
)
334 for (i
= 0; i
< GET_MODE_SIZE (mode
); i
++)
337 if (WORDS_BIG_ENDIAN
)
338 j
= GET_MODE_SIZE (mode
) - i
- 1;
339 if (BYTES_BIG_ENDIAN
!= WORDS_BIG_ENDIAN
340 && GET_MODE_SIZE (mode
) > UNITS_PER_WORD
)
341 j
= j
+ UNITS_PER_WORD
- 2 * (j
% UNITS_PER_WORD
) - 1;
343 if (j
> 2 * HOST_BITS_PER_WIDE_INT
)
346 ch
= (unsigned char) str
[i
];
347 c
[j
/ HOST_BITS_PER_WIDE_INT
] |= ch
<< (j
% HOST_BITS_PER_WIDE_INT
);
349 return immed_double_const (c
[0], c
[1], mode
);
352 /* Cast a target constant CST to target CHAR and if that value fits into
353 host char type, return zero and put that value into variable pointed by
357 target_char_cast (cst
, p
)
361 unsigned HOST_WIDE_INT val
, hostval
;
363 if (!host_integerp (cst
, 1)
364 || CHAR_TYPE_SIZE
> HOST_BITS_PER_WIDE_INT
)
367 val
= tree_low_cst (cst
, 1);
368 if (CHAR_TYPE_SIZE
< HOST_BITS_PER_WIDE_INT
)
369 val
&= (((unsigned HOST_WIDE_INT
) 1) << CHAR_TYPE_SIZE
) - 1;
372 if (HOST_BITS_PER_CHAR
< HOST_BITS_PER_WIDE_INT
)
373 hostval
&= (((unsigned HOST_WIDE_INT
) 1) << HOST_BITS_PER_CHAR
) - 1;
382 /* Given TEM, a pointer to a stack frame, follow the dynamic chain COUNT
383 times to get the address of either a higher stack frame, or a return
384 address located within it (depending on FNDECL_CODE). */
387 expand_builtin_return_addr (fndecl_code
, count
, tem
)
388 enum built_in_function fndecl_code
;
394 /* Some machines need special handling before we can access
395 arbitrary frames. For example, on the sparc, we must first flush
396 all register windows to the stack. */
397 #ifdef SETUP_FRAME_ADDRESSES
399 SETUP_FRAME_ADDRESSES ();
402 /* On the sparc, the return address is not in the frame, it is in a
403 register. There is no way to access it off of the current frame
404 pointer, but it can be accessed off the previous frame pointer by
405 reading the value from the register window save area. */
406 #ifdef RETURN_ADDR_IN_PREVIOUS_FRAME
407 if (fndecl_code
== BUILT_IN_RETURN_ADDRESS
)
411 /* Scan back COUNT frames to the specified frame. */
412 for (i
= 0; i
< count
; i
++)
414 /* Assume the dynamic chain pointer is in the word that the
415 frame address points to, unless otherwise specified. */
416 #ifdef DYNAMIC_CHAIN_ADDRESS
417 tem
= DYNAMIC_CHAIN_ADDRESS (tem
);
419 tem
= memory_address (Pmode
, tem
);
420 tem
= gen_rtx_MEM (Pmode
, tem
);
421 set_mem_alias_set (tem
, get_frame_alias_set ());
422 tem
= copy_to_reg (tem
);
425 /* For __builtin_frame_address, return what we've got. */
426 if (fndecl_code
== BUILT_IN_FRAME_ADDRESS
)
429 /* For __builtin_return_address, Get the return address from that
431 #ifdef RETURN_ADDR_RTX
432 tem
= RETURN_ADDR_RTX (count
, tem
);
434 tem
= memory_address (Pmode
,
435 plus_constant (tem
, GET_MODE_SIZE (Pmode
)));
436 tem
= gen_rtx_MEM (Pmode
, tem
);
437 set_mem_alias_set (tem
, get_frame_alias_set ());
442 /* Alias set used for setjmp buffer. */
443 static HOST_WIDE_INT setjmp_alias_set
= -1;
445 /* Construct the leading half of a __builtin_setjmp call. Control will
446 return to RECEIVER_LABEL. This is used directly by sjlj exception
450 expand_builtin_setjmp_setup (buf_addr
, receiver_label
)
454 enum machine_mode sa_mode
= STACK_SAVEAREA_MODE (SAVE_NONLOCAL
);
458 if (setjmp_alias_set
== -1)
459 setjmp_alias_set
= new_alias_set ();
461 #ifdef POINTERS_EXTEND_UNSIGNED
462 if (GET_MODE (buf_addr
) != Pmode
)
463 buf_addr
= convert_memory_address (Pmode
, buf_addr
);
466 buf_addr
= force_reg (Pmode
, force_operand (buf_addr
, NULL_RTX
));
470 /* We store the frame pointer and the address of receiver_label in
471 the buffer and use the rest of it for the stack save area, which
472 is machine-dependent. */
474 #ifndef BUILTIN_SETJMP_FRAME_VALUE
475 #define BUILTIN_SETJMP_FRAME_VALUE virtual_stack_vars_rtx
478 mem
= gen_rtx_MEM (Pmode
, buf_addr
);
479 set_mem_alias_set (mem
, setjmp_alias_set
);
480 emit_move_insn (mem
, BUILTIN_SETJMP_FRAME_VALUE
);
482 mem
= gen_rtx_MEM (Pmode
, plus_constant (buf_addr
, GET_MODE_SIZE (Pmode
))),
483 set_mem_alias_set (mem
, setjmp_alias_set
);
485 emit_move_insn (validize_mem (mem
),
486 force_reg (Pmode
, gen_rtx_LABEL_REF (Pmode
, receiver_label
)));
488 stack_save
= gen_rtx_MEM (sa_mode
,
489 plus_constant (buf_addr
,
490 2 * GET_MODE_SIZE (Pmode
)));
491 set_mem_alias_set (stack_save
, setjmp_alias_set
);
492 emit_stack_save (SAVE_NONLOCAL
, &stack_save
, NULL_RTX
);
494 /* If there is further processing to do, do it. */
495 #ifdef HAVE_builtin_setjmp_setup
496 if (HAVE_builtin_setjmp_setup
)
497 emit_insn (gen_builtin_setjmp_setup (buf_addr
));
500 /* Tell optimize_save_area_alloca that extra work is going to
501 need to go on during alloca. */
502 current_function_calls_setjmp
= 1;
504 /* Set this so all the registers get saved in our frame; we need to be
505 able to copy the saved values for any registers from frames we unwind. */
506 current_function_has_nonlocal_label
= 1;
509 /* Construct the trailing part of a __builtin_setjmp call.
510 This is used directly by sjlj exception handling code. */
513 expand_builtin_setjmp_receiver (receiver_label
)
514 rtx receiver_label ATTRIBUTE_UNUSED
;
516 /* Clobber the FP when we get here, so we have to make sure it's
517 marked as used by this function. */
518 emit_insn (gen_rtx_USE (VOIDmode
, hard_frame_pointer_rtx
));
520 /* Mark the static chain as clobbered here so life information
521 doesn't get messed up for it. */
522 emit_insn (gen_rtx_CLOBBER (VOIDmode
, static_chain_rtx
));
524 /* Now put in the code to restore the frame pointer, and argument
525 pointer, if needed. The code below is from expand_end_bindings
526 in stmt.c; see detailed documentation there. */
527 #ifdef HAVE_nonlocal_goto
528 if (! HAVE_nonlocal_goto
)
530 emit_move_insn (virtual_stack_vars_rtx
, hard_frame_pointer_rtx
);
532 #if ARG_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM
533 if (fixed_regs
[ARG_POINTER_REGNUM
])
535 #ifdef ELIMINABLE_REGS
537 static const struct elims
{const int from
, to
;} elim_regs
[] = ELIMINABLE_REGS
;
539 for (i
= 0; i
< ARRAY_SIZE (elim_regs
); i
++)
540 if (elim_regs
[i
].from
== ARG_POINTER_REGNUM
541 && elim_regs
[i
].to
== HARD_FRAME_POINTER_REGNUM
)
544 if (i
== ARRAY_SIZE (elim_regs
))
547 /* Now restore our arg pointer from the address at which it
548 was saved in our stack frame. */
549 emit_move_insn (virtual_incoming_args_rtx
,
550 copy_to_reg (get_arg_pointer_save_area (cfun
)));
555 #ifdef HAVE_builtin_setjmp_receiver
556 if (HAVE_builtin_setjmp_receiver
)
557 emit_insn (gen_builtin_setjmp_receiver (receiver_label
));
560 #ifdef HAVE_nonlocal_goto_receiver
561 if (HAVE_nonlocal_goto_receiver
)
562 emit_insn (gen_nonlocal_goto_receiver ());
567 /* @@@ This is a kludge. Not all machine descriptions define a blockage
568 insn, but we must not allow the code we just generated to be reordered
569 by scheduling. Specifically, the update of the frame pointer must
570 happen immediately, not later. So emit an ASM_INPUT to act as blockage
572 emit_insn (gen_rtx_ASM_INPUT (VOIDmode
, ""));
575 /* __builtin_setjmp is passed a pointer to an array of five words (not
576 all will be used on all machines). It operates similarly to the C
577 library function of the same name, but is more efficient. Much of
578 the code below (and for longjmp) is copied from the handling of
581 NOTE: This is intended for use by GNAT and the exception handling
582 scheme in the compiler and will only work in the method used by
586 expand_builtin_setjmp (arglist
, target
)
590 rtx buf_addr
, next_lab
, cont_lab
;
592 if (!validate_arglist (arglist
, POINTER_TYPE
, VOID_TYPE
))
595 if (target
== 0 || GET_CODE (target
) != REG
596 || REGNO (target
) < FIRST_PSEUDO_REGISTER
)
597 target
= gen_reg_rtx (TYPE_MODE (integer_type_node
));
599 buf_addr
= expand_expr (TREE_VALUE (arglist
), NULL_RTX
, VOIDmode
, 0);
601 next_lab
= gen_label_rtx ();
602 cont_lab
= gen_label_rtx ();
604 expand_builtin_setjmp_setup (buf_addr
, next_lab
);
606 /* Set TARGET to zero and branch to the continue label. */
607 emit_move_insn (target
, const0_rtx
);
608 emit_jump_insn (gen_jump (cont_lab
));
610 emit_label (next_lab
);
612 expand_builtin_setjmp_receiver (next_lab
);
614 /* Set TARGET to one. */
615 emit_move_insn (target
, const1_rtx
);
616 emit_label (cont_lab
);
618 /* Tell flow about the strange goings on. Putting `next_lab' on
619 `nonlocal_goto_handler_labels' to indicates that function
620 calls may traverse the arc back to this label. */
622 current_function_has_nonlocal_label
= 1;
623 nonlocal_goto_handler_labels
624 = gen_rtx_EXPR_LIST (VOIDmode
, next_lab
, nonlocal_goto_handler_labels
);
629 /* __builtin_longjmp is passed a pointer to an array of five words (not
630 all will be used on all machines). It operates similarly to the C
631 library function of the same name, but is more efficient. Much of
632 the code below is copied from the handling of non-local gotos.
634 NOTE: This is intended for use by GNAT and the exception handling
635 scheme in the compiler and will only work in the method used by
639 expand_builtin_longjmp (buf_addr
, value
)
642 rtx fp
, lab
, stack
, insn
;
643 enum machine_mode sa_mode
= STACK_SAVEAREA_MODE (SAVE_NONLOCAL
);
645 if (setjmp_alias_set
== -1)
646 setjmp_alias_set
= new_alias_set ();
648 #ifdef POINTERS_EXTEND_UNSIGNED
649 if (GET_MODE (buf_addr
) != Pmode
)
650 buf_addr
= convert_memory_address (Pmode
, buf_addr
);
653 buf_addr
= force_reg (Pmode
, buf_addr
);
655 /* We used to store value in static_chain_rtx, but that fails if pointers
656 are smaller than integers. We instead require that the user must pass
657 a second argument of 1, because that is what builtin_setjmp will
658 return. This also makes EH slightly more efficient, since we are no
659 longer copying around a value that we don't care about. */
660 if (value
!= const1_rtx
)
663 current_function_calls_longjmp
= 1;
665 #ifdef HAVE_builtin_longjmp
666 if (HAVE_builtin_longjmp
)
667 emit_insn (gen_builtin_longjmp (buf_addr
));
671 fp
= gen_rtx_MEM (Pmode
, buf_addr
);
672 lab
= gen_rtx_MEM (Pmode
, plus_constant (buf_addr
,
673 GET_MODE_SIZE (Pmode
)));
675 stack
= gen_rtx_MEM (sa_mode
, plus_constant (buf_addr
,
676 2 * GET_MODE_SIZE (Pmode
)));
677 set_mem_alias_set (fp
, setjmp_alias_set
);
678 set_mem_alias_set (lab
, setjmp_alias_set
);
679 set_mem_alias_set (stack
, setjmp_alias_set
);
681 /* Pick up FP, label, and SP from the block and jump. This code is
682 from expand_goto in stmt.c; see there for detailed comments. */
683 #if HAVE_nonlocal_goto
684 if (HAVE_nonlocal_goto
)
685 /* We have to pass a value to the nonlocal_goto pattern that will
686 get copied into the static_chain pointer, but it does not matter
687 what that value is, because builtin_setjmp does not use it. */
688 emit_insn (gen_nonlocal_goto (value
, lab
, stack
, fp
));
692 lab
= copy_to_reg (lab
);
694 emit_move_insn (hard_frame_pointer_rtx
, fp
);
695 emit_stack_restore (SAVE_NONLOCAL
, stack
, NULL_RTX
);
697 emit_insn (gen_rtx_USE (VOIDmode
, hard_frame_pointer_rtx
));
698 emit_insn (gen_rtx_USE (VOIDmode
, stack_pointer_rtx
));
699 emit_indirect_jump (lab
);
703 /* Search backwards and mark the jump insn as a non-local goto.
704 Note that this precludes the use of __builtin_longjmp to a
705 __builtin_setjmp target in the same function. However, we've
706 already cautioned the user that these functions are for
707 internal exception handling use only. */
708 for (insn
= get_last_insn (); insn
; insn
= PREV_INSN (insn
))
710 if (GET_CODE (insn
) == JUMP_INSN
)
712 REG_NOTES (insn
) = alloc_EXPR_LIST (REG_NON_LOCAL_GOTO
, const0_rtx
,
716 else if (GET_CODE (insn
) == CALL_INSN
)
721 /* Expand a call to __builtin_prefetch. For a target that does not support
722 data prefetch, evaluate the memory address argument in case it has side
726 expand_builtin_prefetch (arglist
)
729 tree arg0
, arg1
, arg2
;
732 if (!validate_arglist (arglist
, POINTER_TYPE
, 0))
735 arg0
= TREE_VALUE (arglist
);
736 /* Arguments 1 and 2 are optional; argument 1 (read/write) defaults to
737 zero (read) and argument 2 (locality) defaults to 3 (high degree of
739 if (TREE_CHAIN (arglist
))
741 arg1
= TREE_VALUE (TREE_CHAIN (arglist
));
742 if (TREE_CHAIN (TREE_CHAIN (arglist
)))
743 arg2
= TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist
)));
745 arg2
= build_int_2 (3, 0);
749 arg1
= integer_zero_node
;
750 arg2
= build_int_2 (3, 0);
753 /* Argument 0 is an address. */
754 op0
= expand_expr (arg0
, NULL_RTX
, Pmode
, EXPAND_NORMAL
);
756 /* Argument 1 (read/write flag) must be a compile-time constant int. */
757 if (TREE_CODE (arg1
) != INTEGER_CST
)
759 error ("second arg to `__builtin_prefetch' must be a constant");
760 arg1
= integer_zero_node
;
762 op1
= expand_expr (arg1
, NULL_RTX
, VOIDmode
, 0);
763 /* Argument 1 must be either zero or one. */
764 if (INTVAL (op1
) != 0 && INTVAL (op1
) != 1)
766 warning ("invalid second arg to __builtin_prefetch; using zero");
770 /* Argument 2 (locality) must be a compile-time constant int. */
771 if (TREE_CODE (arg2
) != INTEGER_CST
)
773 error ("third arg to `__builtin_prefetch' must be a constant");
774 arg2
= integer_zero_node
;
776 op2
= expand_expr (arg2
, NULL_RTX
, VOIDmode
, 0);
777 /* Argument 2 must be 0, 1, 2, or 3. */
778 if (INTVAL (op2
) < 0 || INTVAL (op2
) > 3)
780 warning ("invalid third arg to __builtin_prefetch; using zero");
787 if (! (*insn_data
[(int)CODE_FOR_prefetch
].operand
[0].predicate
)
789 op0
= force_reg (Pmode
, op0
);
790 emit_insn (gen_prefetch (op0
, op1
, op2
));
794 op0
= protect_from_queue (op0
, 0);
795 /* Don't do anything with direct references to volatile memory, but
796 generate code to handle other side effects. */
797 if (GET_CODE (op0
) != MEM
&& side_effects_p (op0
))
801 /* Get a MEM rtx for expression EXP which is the address of an operand
802 to be used to be used in a string instruction (cmpstrsi, movstrsi, ..). */
808 rtx addr
= expand_expr (exp
, NULL_RTX
, ptr_mode
, EXPAND_SUM
);
811 #ifdef POINTERS_EXTEND_UNSIGNED
812 if (GET_MODE (addr
) != Pmode
)
813 addr
= convert_memory_address (Pmode
, addr
);
816 mem
= gen_rtx_MEM (BLKmode
, memory_address (BLKmode
, addr
));
818 /* Get an expression we can use to find the attributes to assign to MEM.
819 If it is an ADDR_EXPR, use the operand. Otherwise, dereference it if
820 we can. First remove any nops. */
821 while ((TREE_CODE (exp
) == NOP_EXPR
|| TREE_CODE (exp
) == CONVERT_EXPR
822 || TREE_CODE (exp
) == NON_LVALUE_EXPR
)
823 && POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (exp
, 0))))
824 exp
= TREE_OPERAND (exp
, 0);
826 if (TREE_CODE (exp
) == ADDR_EXPR
)
828 exp
= TREE_OPERAND (exp
, 0);
829 set_mem_attributes (mem
, exp
, 0);
831 else if (POINTER_TYPE_P (TREE_TYPE (exp
)))
833 exp
= build1 (INDIRECT_REF
, TREE_TYPE (TREE_TYPE (exp
)), exp
);
834 /* memcpy, memset and other builtin stringops can alias with anything. */
835 set_mem_alias_set (mem
, 0);
841 /* Built-in functions to perform an untyped call and return. */
843 /* For each register that may be used for calling a function, this
844 gives a mode used to copy the register's value. VOIDmode indicates
845 the register is not used for calling a function. If the machine
846 has register windows, this gives only the outbound registers.
847 INCOMING_REGNO gives the corresponding inbound register. */
848 static enum machine_mode apply_args_mode
[FIRST_PSEUDO_REGISTER
];
850 /* For each register that may be used for returning values, this gives
851 a mode used to copy the register's value. VOIDmode indicates the
852 register is not used for returning values. If the machine has
853 register windows, this gives only the outbound registers.
854 INCOMING_REGNO gives the corresponding inbound register. */
855 static enum machine_mode apply_result_mode
[FIRST_PSEUDO_REGISTER
];
857 /* For each register that may be used for calling a function, this
858 gives the offset of that register into the block returned by
859 __builtin_apply_args. 0 indicates that the register is not
860 used for calling a function. */
861 static int apply_args_reg_offset
[FIRST_PSEUDO_REGISTER
];
863 /* Return the offset of register REGNO into the block returned by
864 __builtin_apply_args. This is not declared static, since it is
865 needed in objc-act.c. */
868 apply_args_register_offset (regno
)
873 /* Arguments are always put in outgoing registers (in the argument
874 block) if such make sense. */
875 #ifdef OUTGOING_REGNO
876 regno
= OUTGOING_REGNO(regno
);
878 return apply_args_reg_offset
[regno
];
881 /* Return the size required for the block returned by __builtin_apply_args,
882 and initialize apply_args_mode. */
887 static int size
= -1;
889 enum machine_mode mode
;
891 /* The values computed by this function never change. */
894 /* The first value is the incoming arg-pointer. */
895 size
= GET_MODE_SIZE (Pmode
);
897 /* The second value is the structure value address unless this is
898 passed as an "invisible" first argument. */
899 if (struct_value_rtx
)
900 size
+= GET_MODE_SIZE (Pmode
);
902 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
903 if (FUNCTION_ARG_REGNO_P (regno
))
905 /* Search for the proper mode for copying this register's
906 value. I'm not sure this is right, but it works so far. */
907 enum machine_mode best_mode
= VOIDmode
;
909 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_INT
);
911 mode
= GET_MODE_WIDER_MODE (mode
))
912 if (HARD_REGNO_MODE_OK (regno
, mode
)
913 && HARD_REGNO_NREGS (regno
, mode
) == 1)
916 if (best_mode
== VOIDmode
)
917 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_FLOAT
);
919 mode
= GET_MODE_WIDER_MODE (mode
))
920 if (HARD_REGNO_MODE_OK (regno
, mode
)
921 && have_insn_for (SET
, mode
))
924 if (best_mode
== VOIDmode
)
925 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_VECTOR_FLOAT
);
927 mode
= GET_MODE_WIDER_MODE (mode
))
928 if (HARD_REGNO_MODE_OK (regno
, mode
)
929 && have_insn_for (SET
, mode
))
932 if (best_mode
== VOIDmode
)
933 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_VECTOR_INT
);
935 mode
= GET_MODE_WIDER_MODE (mode
))
936 if (HARD_REGNO_MODE_OK (regno
, mode
)
937 && have_insn_for (SET
, mode
))
941 if (mode
== VOIDmode
)
944 align
= GET_MODE_ALIGNMENT (mode
) / BITS_PER_UNIT
;
945 if (size
% align
!= 0)
946 size
= CEIL (size
, align
) * align
;
947 apply_args_reg_offset
[regno
] = size
;
948 size
+= GET_MODE_SIZE (mode
);
949 apply_args_mode
[regno
] = mode
;
953 apply_args_mode
[regno
] = VOIDmode
;
954 apply_args_reg_offset
[regno
] = 0;
960 /* Return the size required for the block returned by __builtin_apply,
961 and initialize apply_result_mode. */
966 static int size
= -1;
968 enum machine_mode mode
;
970 /* The values computed by this function never change. */
975 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
976 if (FUNCTION_VALUE_REGNO_P (regno
))
978 /* Search for the proper mode for copying this register's
979 value. I'm not sure this is right, but it works so far. */
980 enum machine_mode best_mode
= VOIDmode
;
982 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_INT
);
984 mode
= GET_MODE_WIDER_MODE (mode
))
985 if (HARD_REGNO_MODE_OK (regno
, mode
))
988 if (best_mode
== VOIDmode
)
989 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_FLOAT
);
991 mode
= GET_MODE_WIDER_MODE (mode
))
992 if (HARD_REGNO_MODE_OK (regno
, mode
)
993 && have_insn_for (SET
, mode
))
996 if (best_mode
== VOIDmode
)
997 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_VECTOR_FLOAT
);
999 mode
= GET_MODE_WIDER_MODE (mode
))
1000 if (HARD_REGNO_MODE_OK (regno
, mode
)
1001 && have_insn_for (SET
, mode
))
1004 if (best_mode
== VOIDmode
)
1005 for (mode
= GET_CLASS_NARROWEST_MODE (MODE_VECTOR_INT
);
1007 mode
= GET_MODE_WIDER_MODE (mode
))
1008 if (HARD_REGNO_MODE_OK (regno
, mode
)
1009 && have_insn_for (SET
, mode
))
1013 if (mode
== VOIDmode
)
1016 align
= GET_MODE_ALIGNMENT (mode
) / BITS_PER_UNIT
;
1017 if (size
% align
!= 0)
1018 size
= CEIL (size
, align
) * align
;
1019 size
+= GET_MODE_SIZE (mode
);
1020 apply_result_mode
[regno
] = mode
;
1023 apply_result_mode
[regno
] = VOIDmode
;
1025 /* Allow targets that use untyped_call and untyped_return to override
1026 the size so that machine-specific information can be stored here. */
1027 #ifdef APPLY_RESULT_SIZE
1028 size
= APPLY_RESULT_SIZE
;
1034 #if defined (HAVE_untyped_call) || defined (HAVE_untyped_return)
1035 /* Create a vector describing the result block RESULT. If SAVEP is true,
1036 the result block is used to save the values; otherwise it is used to
1037 restore the values. */
1040 result_vector (savep
, result
)
1044 int regno
, size
, align
, nelts
;
1045 enum machine_mode mode
;
1047 rtx
*savevec
= (rtx
*) alloca (FIRST_PSEUDO_REGISTER
* sizeof (rtx
));
1050 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
1051 if ((mode
= apply_result_mode
[regno
]) != VOIDmode
)
1053 align
= GET_MODE_ALIGNMENT (mode
) / BITS_PER_UNIT
;
1054 if (size
% align
!= 0)
1055 size
= CEIL (size
, align
) * align
;
1056 reg
= gen_rtx_REG (mode
, savep
? regno
: INCOMING_REGNO (regno
));
1057 mem
= adjust_address (result
, mode
, size
);
1058 savevec
[nelts
++] = (savep
1059 ? gen_rtx_SET (VOIDmode
, mem
, reg
)
1060 : gen_rtx_SET (VOIDmode
, reg
, mem
));
1061 size
+= GET_MODE_SIZE (mode
);
1063 return gen_rtx_PARALLEL (VOIDmode
, gen_rtvec_v (nelts
, savevec
));
1065 #endif /* HAVE_untyped_call or HAVE_untyped_return */
1067 /* Save the state required to perform an untyped call with the same
1068 arguments as were passed to the current function. */
1071 expand_builtin_apply_args_1 ()
1074 int size
, align
, regno
;
1075 enum machine_mode mode
;
1077 /* Create a block where the arg-pointer, structure value address,
1078 and argument registers can be saved. */
1079 registers
= assign_stack_local (BLKmode
, apply_args_size (), -1);
1081 /* Walk past the arg-pointer and structure value address. */
1082 size
= GET_MODE_SIZE (Pmode
);
1083 if (struct_value_rtx
)
1084 size
+= GET_MODE_SIZE (Pmode
);
1086 /* Save each register used in calling a function to the block. */
1087 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
1088 if ((mode
= apply_args_mode
[regno
]) != VOIDmode
)
1092 align
= GET_MODE_ALIGNMENT (mode
) / BITS_PER_UNIT
;
1093 if (size
% align
!= 0)
1094 size
= CEIL (size
, align
) * align
;
1096 tem
= gen_rtx_REG (mode
, INCOMING_REGNO (regno
));
1098 emit_move_insn (adjust_address (registers
, mode
, size
), tem
);
1099 size
+= GET_MODE_SIZE (mode
);
1102 /* Save the arg pointer to the block. */
1103 emit_move_insn (adjust_address (registers
, Pmode
, 0),
1104 copy_to_reg (virtual_incoming_args_rtx
));
1105 size
= GET_MODE_SIZE (Pmode
);
1107 /* Save the structure value address unless this is passed as an
1108 "invisible" first argument. */
1109 if (struct_value_incoming_rtx
)
1111 emit_move_insn (adjust_address (registers
, Pmode
, size
),
1112 copy_to_reg (struct_value_incoming_rtx
));
1113 size
+= GET_MODE_SIZE (Pmode
);
1116 /* Return the address of the block. */
1117 return copy_addr_to_reg (XEXP (registers
, 0));
1120 /* __builtin_apply_args returns block of memory allocated on
1121 the stack into which is stored the arg pointer, structure
1122 value address, static chain, and all the registers that might
1123 possibly be used in performing a function call. The code is
1124 moved to the start of the function so the incoming values are
1128 expand_builtin_apply_args ()
1130 /* Don't do __builtin_apply_args more than once in a function.
1131 Save the result of the first call and reuse it. */
1132 if (apply_args_value
!= 0)
1133 return apply_args_value
;
1135 /* When this function is called, it means that registers must be
1136 saved on entry to this function. So we migrate the
1137 call to the first insn of this function. */
1142 temp
= expand_builtin_apply_args_1 ();
1146 apply_args_value
= temp
;
1148 /* Put the sequence after the NOTE that starts the function.
1149 If this is inside a SEQUENCE, make the outer-level insn
1150 chain current, so the code is placed at the start of the
1152 push_topmost_sequence ();
1153 emit_insns_before (seq
, NEXT_INSN (get_insns ()));
1154 pop_topmost_sequence ();
1159 /* Perform an untyped call and save the state required to perform an
1160 untyped return of whatever value was returned by the given function. */
1163 expand_builtin_apply (function
, arguments
, argsize
)
1164 rtx function
, arguments
, argsize
;
1166 int size
, align
, regno
;
1167 enum machine_mode mode
;
1168 rtx incoming_args
, result
, reg
, dest
, src
, call_insn
;
1169 rtx old_stack_level
= 0;
1170 rtx call_fusage
= 0;
1172 #ifdef POINTERS_EXTEND_UNSIGNED
1173 if (GET_MODE (arguments
) != Pmode
)
1174 arguments
= convert_memory_address (Pmode
, arguments
);
1177 /* Create a block where the return registers can be saved. */
1178 result
= assign_stack_local (BLKmode
, apply_result_size (), -1);
1180 /* Fetch the arg pointer from the ARGUMENTS block. */
1181 incoming_args
= gen_reg_rtx (Pmode
);
1182 emit_move_insn (incoming_args
, gen_rtx_MEM (Pmode
, arguments
));
1183 #ifndef STACK_GROWS_DOWNWARD
1184 incoming_args
= expand_simple_binop (Pmode
, MINUS
, incoming_args
, argsize
,
1185 incoming_args
, 0, OPTAB_LIB_WIDEN
);
1188 /* Perform postincrements before actually calling the function. */
1191 /* Push a new argument block and copy the arguments. Do not allow
1192 the (potential) memcpy call below to interfere with our stack
1194 do_pending_stack_adjust ();
1197 /* Save the stack with nonlocal if available */
1198 #ifdef HAVE_save_stack_nonlocal
1199 if (HAVE_save_stack_nonlocal
)
1200 emit_stack_save (SAVE_NONLOCAL
, &old_stack_level
, NULL_RTX
);
1203 emit_stack_save (SAVE_BLOCK
, &old_stack_level
, NULL_RTX
);
1205 /* Push a block of memory onto the stack to store the memory arguments.
1206 Save the address in a register, and copy the memory arguments. ??? I
1207 haven't figured out how the calling convention macros effect this,
1208 but it's likely that the source and/or destination addresses in
1209 the block copy will need updating in machine specific ways. */
1210 dest
= allocate_dynamic_stack_space (argsize
, 0, BITS_PER_UNIT
);
1211 dest
= gen_rtx_MEM (BLKmode
, dest
);
1212 set_mem_align (dest
, PARM_BOUNDARY
);
1213 src
= gen_rtx_MEM (BLKmode
, incoming_args
);
1214 set_mem_align (src
, PARM_BOUNDARY
);
1215 emit_block_move (dest
, src
, argsize
);
1217 /* Refer to the argument block. */
1219 arguments
= gen_rtx_MEM (BLKmode
, arguments
);
1220 set_mem_align (arguments
, PARM_BOUNDARY
);
1222 /* Walk past the arg-pointer and structure value address. */
1223 size
= GET_MODE_SIZE (Pmode
);
1224 if (struct_value_rtx
)
1225 size
+= GET_MODE_SIZE (Pmode
);
1227 /* Restore each of the registers previously saved. Make USE insns
1228 for each of these registers for use in making the call. */
1229 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
1230 if ((mode
= apply_args_mode
[regno
]) != VOIDmode
)
1232 align
= GET_MODE_ALIGNMENT (mode
) / BITS_PER_UNIT
;
1233 if (size
% align
!= 0)
1234 size
= CEIL (size
, align
) * align
;
1235 reg
= gen_rtx_REG (mode
, regno
);
1236 emit_move_insn (reg
, adjust_address (arguments
, mode
, size
));
1237 use_reg (&call_fusage
, reg
);
1238 size
+= GET_MODE_SIZE (mode
);
1241 /* Restore the structure value address unless this is passed as an
1242 "invisible" first argument. */
1243 size
= GET_MODE_SIZE (Pmode
);
1244 if (struct_value_rtx
)
1246 rtx value
= gen_reg_rtx (Pmode
);
1247 emit_move_insn (value
, adjust_address (arguments
, Pmode
, size
));
1248 emit_move_insn (struct_value_rtx
, value
);
1249 if (GET_CODE (struct_value_rtx
) == REG
)
1250 use_reg (&call_fusage
, struct_value_rtx
);
1251 size
+= GET_MODE_SIZE (Pmode
);
1254 /* All arguments and registers used for the call are set up by now! */
1255 function
= prepare_call_address (function
, NULL_TREE
, &call_fusage
, 0, 0);
1257 /* Ensure address is valid. SYMBOL_REF is already valid, so no need,
1258 and we don't want to load it into a register as an optimization,
1259 because prepare_call_address already did it if it should be done. */
1260 if (GET_CODE (function
) != SYMBOL_REF
)
1261 function
= memory_address (FUNCTION_MODE
, function
);
1263 /* Generate the actual call instruction and save the return value. */
1264 #ifdef HAVE_untyped_call
1265 if (HAVE_untyped_call
)
1266 emit_call_insn (gen_untyped_call (gen_rtx_MEM (FUNCTION_MODE
, function
),
1267 result
, result_vector (1, result
)));
1270 #ifdef HAVE_call_value
1271 if (HAVE_call_value
)
1275 /* Locate the unique return register. It is not possible to
1276 express a call that sets more than one return register using
1277 call_value; use untyped_call for that. In fact, untyped_call
1278 only needs to save the return registers in the given block. */
1279 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
1280 if ((mode
= apply_result_mode
[regno
]) != VOIDmode
)
1283 abort (); /* HAVE_untyped_call required. */
1284 valreg
= gen_rtx_REG (mode
, regno
);
1287 emit_call_insn (GEN_CALL_VALUE (valreg
,
1288 gen_rtx_MEM (FUNCTION_MODE
, function
),
1289 const0_rtx
, NULL_RTX
, const0_rtx
));
1291 emit_move_insn (adjust_address (result
, GET_MODE (valreg
), 0), valreg
);
1297 /* Find the CALL insn we just emitted. */
1298 for (call_insn
= get_last_insn ();
1299 call_insn
&& GET_CODE (call_insn
) != CALL_INSN
;
1300 call_insn
= PREV_INSN (call_insn
))
1306 /* Put the register usage information on the CALL. If there is already
1307 some usage information, put ours at the end. */
1308 if (CALL_INSN_FUNCTION_USAGE (call_insn
))
1312 for (link
= CALL_INSN_FUNCTION_USAGE (call_insn
); XEXP (link
, 1) != 0;
1313 link
= XEXP (link
, 1))
1316 XEXP (link
, 1) = call_fusage
;
1319 CALL_INSN_FUNCTION_USAGE (call_insn
) = call_fusage
;
1321 /* Restore the stack. */
1322 #ifdef HAVE_save_stack_nonlocal
1323 if (HAVE_save_stack_nonlocal
)
1324 emit_stack_restore (SAVE_NONLOCAL
, old_stack_level
, NULL_RTX
);
1327 emit_stack_restore (SAVE_BLOCK
, old_stack_level
, NULL_RTX
);
1331 /* Return the address of the result block. */
1332 return copy_addr_to_reg (XEXP (result
, 0));
1335 /* Perform an untyped return. */
1338 expand_builtin_return (result
)
1341 int size
, align
, regno
;
1342 enum machine_mode mode
;
1344 rtx call_fusage
= 0;
1346 #ifdef POINTERS_EXTEND_UNSIGNED
1347 if (GET_MODE (result
) != Pmode
)
1348 result
= convert_memory_address (Pmode
, result
);
1351 apply_result_size ();
1352 result
= gen_rtx_MEM (BLKmode
, result
);
1354 #ifdef HAVE_untyped_return
1355 if (HAVE_untyped_return
)
1357 emit_jump_insn (gen_untyped_return (result
, result_vector (0, result
)));
1363 /* Restore the return value and note that each value is used. */
1365 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
1366 if ((mode
= apply_result_mode
[regno
]) != VOIDmode
)
1368 align
= GET_MODE_ALIGNMENT (mode
) / BITS_PER_UNIT
;
1369 if (size
% align
!= 0)
1370 size
= CEIL (size
, align
) * align
;
1371 reg
= gen_rtx_REG (mode
, INCOMING_REGNO (regno
));
1372 emit_move_insn (reg
, adjust_address (result
, mode
, size
));
1374 push_to_sequence (call_fusage
);
1375 emit_insn (gen_rtx_USE (VOIDmode
, reg
));
1376 call_fusage
= get_insns ();
1378 size
+= GET_MODE_SIZE (mode
);
1381 /* Put the USE insns before the return. */
1382 emit_insns (call_fusage
);
1384 /* Return whatever values was restored by jumping directly to the end
1386 expand_null_return ();
1389 /* Used by expand_builtin_classify_type and fold_builtin_classify_type. */
1391 static enum type_class
1392 type_to_class (type
)
1395 switch (TREE_CODE (type
))
1397 case VOID_TYPE
: return void_type_class
;
1398 case INTEGER_TYPE
: return integer_type_class
;
1399 case CHAR_TYPE
: return char_type_class
;
1400 case ENUMERAL_TYPE
: return enumeral_type_class
;
1401 case BOOLEAN_TYPE
: return boolean_type_class
;
1402 case POINTER_TYPE
: return pointer_type_class
;
1403 case REFERENCE_TYPE
: return reference_type_class
;
1404 case OFFSET_TYPE
: return offset_type_class
;
1405 case REAL_TYPE
: return real_type_class
;
1406 case COMPLEX_TYPE
: return complex_type_class
;
1407 case FUNCTION_TYPE
: return function_type_class
;
1408 case METHOD_TYPE
: return method_type_class
;
1409 case RECORD_TYPE
: return record_type_class
;
1411 case QUAL_UNION_TYPE
: return union_type_class
;
1412 case ARRAY_TYPE
: return (TYPE_STRING_FLAG (type
)
1413 ? string_type_class
: array_type_class
);
1414 case SET_TYPE
: return set_type_class
;
1415 case FILE_TYPE
: return file_type_class
;
1416 case LANG_TYPE
: return lang_type_class
;
1417 default: return no_type_class
;
1421 /* Expand a call to __builtin_classify_type with arguments found in
1425 expand_builtin_classify_type (arglist
)
1429 return GEN_INT (type_to_class (TREE_TYPE (TREE_VALUE (arglist
))));
1430 return GEN_INT (no_type_class
);
1433 /* Expand expression EXP, which is a call to __builtin_constant_p. */
1436 expand_builtin_constant_p (exp
)
1439 tree arglist
= TREE_OPERAND (exp
, 1);
1440 enum machine_mode value_mode
= TYPE_MODE (TREE_TYPE (exp
));
1445 arglist
= TREE_VALUE (arglist
);
1447 /* We have taken care of the easy cases during constant folding. This
1448 case is not obvious, so emit (constant_p_rtx (ARGLIST)) and let CSE get a
1449 chance to see if it can deduce whether ARGLIST is constant. */
1451 tmp
= expand_expr (arglist
, NULL_RTX
, VOIDmode
, 0);
1452 tmp
= gen_rtx_CONSTANT_P_RTX (value_mode
, tmp
);
1456 /* Expand a call to one of the builtin math functions (sin, cos, or sqrt).
1457 Return 0 if a normal call should be emitted rather than expanding the
1458 function in-line. EXP is the expression that is a call to the builtin
1459 function; if convenient, the result should be placed in TARGET.
1460 SUBTARGET may be used as the target for computing one of EXP's operands. */
1463 expand_builtin_mathfn (exp
, target
, subtarget
)
1465 rtx target
, subtarget
;
1467 optab builtin_optab
;
1469 tree fndecl
= TREE_OPERAND (TREE_OPERAND (exp
, 0), 0);
1470 tree arglist
= TREE_OPERAND (exp
, 1);
1472 if (!validate_arglist (arglist
, REAL_TYPE
, VOID_TYPE
))
1475 /* Stabilize and compute the argument. */
1476 if (TREE_CODE (TREE_VALUE (arglist
)) != VAR_DECL
1477 && TREE_CODE (TREE_VALUE (arglist
)) != PARM_DECL
)
1479 exp
= copy_node (exp
);
1480 TREE_OPERAND (exp
, 1) = arglist
;
1481 /* Wrap the computation of the argument in a SAVE_EXPR. That
1482 way, if we need to expand the argument again (as in the
1483 flag_errno_math case below where we cannot directly set
1484 errno), we will not perform side-effects more than once.
1485 Note that here we're mutating the original EXP as well as the
1486 copy; that's the right thing to do in case the original EXP
1487 is expanded later. */
1488 TREE_VALUE (arglist
) = save_expr (TREE_VALUE (arglist
));
1489 arglist
= copy_node (arglist
);
1491 op0
= expand_expr (TREE_VALUE (arglist
), subtarget
, VOIDmode
, 0);
1493 /* Make a suitable register to place result in. */
1494 target
= gen_reg_rtx (TYPE_MODE (TREE_TYPE (exp
)));
1499 switch (DECL_FUNCTION_CODE (fndecl
))
1504 builtin_optab
= sin_optab
; break;
1508 builtin_optab
= cos_optab
; break;
1510 case BUILT_IN_SQRTF
:
1511 case BUILT_IN_SQRTL
:
1512 builtin_optab
= sqrt_optab
; break;
1517 /* Compute into TARGET.
1518 Set TARGET to wherever the result comes back. */
1519 target
= expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist
))),
1520 builtin_optab
, op0
, target
, 0);
1522 /* If we were unable to expand via the builtin, stop the
1523 sequence (without outputting the insns) and return 0, causing
1524 a call to the library function. */
1531 /* If errno must be maintained and if we are not allowing unsafe
1532 math optimizations, check the result. */
1534 if (flag_errno_math
&& ! flag_unsafe_math_optimizations
)
1538 /* Don't define the builtin FP instructions
1539 if your machine is not IEEE. */
1540 if (TARGET_FLOAT_FORMAT
!= IEEE_FLOAT_FORMAT
)
1543 lab1
= gen_label_rtx ();
1545 /* Test the result; if it is NaN, set errno=EDOM because
1546 the argument was not in the domain. */
1547 emit_cmp_and_jump_insns (target
, target
, EQ
, 0, GET_MODE (target
),
1552 #ifdef GEN_ERRNO_RTX
1553 rtx errno_rtx
= GEN_ERRNO_RTX
;
1556 = gen_rtx_MEM (word_mode
, gen_rtx_SYMBOL_REF (Pmode
, "errno"));
1559 emit_move_insn (errno_rtx
, GEN_INT (TARGET_EDOM
));
1562 /* We can't set errno=EDOM directly; let the library call do it.
1563 Pop the arguments right away in case the call gets deleted. */
1565 expand_call (exp
, target
, 0);
1572 /* Output the entire sequence. */
1573 insns
= get_insns ();
1580 /* Expand expression EXP which is a call to the strlen builtin. Return 0
1581 if we failed the caller should emit a normal call, otherwise
1582 try to get the result in TARGET, if convenient. */
1585 expand_builtin_strlen (exp
, target
)
1589 tree arglist
= TREE_OPERAND (exp
, 1);
1590 enum machine_mode value_mode
= TYPE_MODE (TREE_TYPE (exp
));
1592 if (!validate_arglist (arglist
, POINTER_TYPE
, VOID_TYPE
))
1597 tree src
= TREE_VALUE (arglist
);
1600 = get_pointer_alignment (src
, BIGGEST_ALIGNMENT
) / BITS_PER_UNIT
;
1602 rtx result
, src_reg
, char_rtx
, before_strlen
;
1603 enum machine_mode insn_mode
= value_mode
, char_mode
;
1604 enum insn_code icode
= CODE_FOR_nothing
;
1606 /* If SRC is not a pointer type, don't do this operation inline. */
1610 /* Bail out if we can't compute strlen in the right mode. */
1611 while (insn_mode
!= VOIDmode
)
1613 icode
= strlen_optab
->handlers
[(int) insn_mode
].insn_code
;
1614 if (icode
!= CODE_FOR_nothing
)
1617 insn_mode
= GET_MODE_WIDER_MODE (insn_mode
);
1619 if (insn_mode
== VOIDmode
)
1622 /* Make a place to write the result of the instruction. */
1625 && GET_CODE (result
) == REG
1626 && GET_MODE (result
) == insn_mode
1627 && REGNO (result
) >= FIRST_PSEUDO_REGISTER
))
1628 result
= gen_reg_rtx (insn_mode
);
1630 /* Make a place to hold the source address. We will not expand
1631 the actual source until we are sure that the expansion will
1632 not fail -- there are trees that cannot be expanded twice. */
1633 src_reg
= gen_reg_rtx (Pmode
);
1635 /* Mark the beginning of the strlen sequence so we can emit the
1636 source operand later. */
1637 before_strlen
= get_last_insn();
1639 char_rtx
= const0_rtx
;
1640 char_mode
= insn_data
[(int) icode
].operand
[2].mode
;
1641 if (! (*insn_data
[(int) icode
].operand
[2].predicate
) (char_rtx
,
1643 char_rtx
= copy_to_mode_reg (char_mode
, char_rtx
);
1645 pat
= GEN_FCN (icode
) (result
, gen_rtx_MEM (BLKmode
, src_reg
),
1646 char_rtx
, GEN_INT (align
));
1651 /* Now that we are assured of success, expand the source. */
1653 pat
= memory_address (BLKmode
,
1654 expand_expr (src
, src_reg
, ptr_mode
, EXPAND_SUM
));
1656 emit_move_insn (src_reg
, pat
);
1657 pat
= gen_sequence ();
1661 emit_insn_after (pat
, before_strlen
);
1663 emit_insn_before (pat
, get_insns ());
1665 /* Return the value in the proper mode for this function. */
1666 if (GET_MODE (result
) == value_mode
)
1668 else if (target
!= 0)
1669 convert_move (target
, result
, 0);
1671 target
= convert_to_mode (value_mode
, result
, 0);
1677 /* Expand a call to the strstr builtin. Return 0 if we failed the
1678 caller should emit a normal call, otherwise try to get the result
1679 in TARGET, if convenient (and in mode MODE if that's convenient). */
1682 expand_builtin_strstr (arglist
, target
, mode
)
1685 enum machine_mode mode
;
1687 if (!validate_arglist (arglist
, POINTER_TYPE
, POINTER_TYPE
, VOID_TYPE
))
1691 tree s1
= TREE_VALUE (arglist
), s2
= TREE_VALUE (TREE_CHAIN (arglist
));
1693 const char *p1
, *p2
;
1702 const char *r
= strstr (p1
, p2
);
1707 /* Return an offset into the constant string argument. */
1708 return expand_expr (fold (build (PLUS_EXPR
, TREE_TYPE (s1
),
1709 s1
, ssize_int (r
- p1
))),
1710 target
, mode
, EXPAND_NORMAL
);
1714 return expand_expr (s1
, target
, mode
, EXPAND_NORMAL
);
1719 fn
= built_in_decls
[BUILT_IN_STRCHR
];
1723 /* New argument list transforming strstr(s1, s2) to
1724 strchr(s1, s2[0]). */
1726 build_tree_list (NULL_TREE
, build_int_2 (p2
[0], 0));
1727 arglist
= tree_cons (NULL_TREE
, s1
, arglist
);
1728 return expand_expr (build_function_call_expr (fn
, arglist
),
1729 target
, mode
, EXPAND_NORMAL
);
1733 /* Expand a call to the strchr builtin. Return 0 if we failed the
1734 caller should emit a normal call, otherwise try to get the result
1735 in TARGET, if convenient (and in mode MODE if that's convenient). */
1738 expand_builtin_strchr (arglist
, target
, mode
)
1741 enum machine_mode mode
;
1743 if (!validate_arglist (arglist
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
1747 tree s1
= TREE_VALUE (arglist
), s2
= TREE_VALUE (TREE_CHAIN (arglist
));
1750 if (TREE_CODE (s2
) != INTEGER_CST
)
1759 if (target_char_cast (s2
, &c
))
1767 /* Return an offset into the constant string argument. */
1768 return expand_expr (fold (build (PLUS_EXPR
, TREE_TYPE (s1
),
1769 s1
, ssize_int (r
- p1
))),
1770 target
, mode
, EXPAND_NORMAL
);
1773 /* FIXME: Should use here strchrM optab so that ports can optimize
1779 /* Expand a call to the strrchr builtin. Return 0 if we failed the
1780 caller should emit a normal call, otherwise try to get the result
1781 in TARGET, if convenient (and in mode MODE if that's convenient). */
1784 expand_builtin_strrchr (arglist
, target
, mode
)
1787 enum machine_mode mode
;
1789 if (!validate_arglist (arglist
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
1793 tree s1
= TREE_VALUE (arglist
), s2
= TREE_VALUE (TREE_CHAIN (arglist
));
1797 if (TREE_CODE (s2
) != INTEGER_CST
)
1806 if (target_char_cast (s2
, &c
))
1809 r
= strrchr (p1
, c
);
1814 /* Return an offset into the constant string argument. */
1815 return expand_expr (fold (build (PLUS_EXPR
, TREE_TYPE (s1
),
1816 s1
, ssize_int (r
- p1
))),
1817 target
, mode
, EXPAND_NORMAL
);
1820 if (! integer_zerop (s2
))
1823 fn
= built_in_decls
[BUILT_IN_STRCHR
];
1827 /* Transform strrchr(s1, '\0') to strchr(s1, '\0'). */
1828 return expand_expr (build_function_call_expr (fn
, arglist
),
1829 target
, mode
, EXPAND_NORMAL
);
1833 /* Expand a call to the strpbrk builtin. Return 0 if we failed the
1834 caller should emit a normal call, otherwise try to get the result
1835 in TARGET, if convenient (and in mode MODE if that's convenient). */
1838 expand_builtin_strpbrk (arglist
, target
, mode
)
1841 enum machine_mode mode
;
1843 if (!validate_arglist (arglist
, POINTER_TYPE
, POINTER_TYPE
, VOID_TYPE
))
1847 tree s1
= TREE_VALUE (arglist
), s2
= TREE_VALUE (TREE_CHAIN (arglist
));
1849 const char *p1
, *p2
;
1858 const char *r
= strpbrk (p1
, p2
);
1863 /* Return an offset into the constant string argument. */
1864 return expand_expr (fold (build (PLUS_EXPR
, TREE_TYPE (s1
),
1865 s1
, ssize_int (r
- p1
))),
1866 target
, mode
, EXPAND_NORMAL
);
1871 /* strpbrk(x, "") == NULL.
1872 Evaluate and ignore the arguments in case they had
1874 expand_expr (s1
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
1879 return 0; /* Really call strpbrk. */
1881 fn
= built_in_decls
[BUILT_IN_STRCHR
];
1885 /* New argument list transforming strpbrk(s1, s2) to
1886 strchr(s1, s2[0]). */
1888 build_tree_list (NULL_TREE
, build_int_2 (p2
[0], 0));
1889 arglist
= tree_cons (NULL_TREE
, s1
, arglist
);
1890 return expand_expr (build_function_call_expr (fn
, arglist
),
1891 target
, mode
, EXPAND_NORMAL
);
1895 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
1896 bytes from constant string DATA + OFFSET and return it as target
1900 builtin_memcpy_read_str (data
, offset
, mode
)
1902 HOST_WIDE_INT offset
;
1903 enum machine_mode mode
;
1905 const char *str
= (const char *) data
;
1908 || ((unsigned HOST_WIDE_INT
) offset
+ GET_MODE_SIZE (mode
)
1909 > strlen (str
) + 1))
1910 abort (); /* Attempt to read past the end of constant string. */
1912 return c_readstr (str
+ offset
, mode
);
1915 /* Expand a call to the memcpy builtin, with arguments in ARGLIST.
1916 Return 0 if we failed, the caller should emit a normal call, otherwise
1917 try to get the result in TARGET, if convenient (and in mode MODE if
1918 that's convenient). */
1921 expand_builtin_memcpy (arglist
, target
, mode
)
1924 enum machine_mode mode
;
1926 if (!validate_arglist (arglist
,
1927 POINTER_TYPE
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
1931 tree dest
= TREE_VALUE (arglist
);
1932 tree src
= TREE_VALUE (TREE_CHAIN (arglist
));
1933 tree len
= TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist
)));
1934 const char *src_str
;
1936 unsigned int src_align
= get_pointer_alignment (src
, BIGGEST_ALIGNMENT
);
1937 unsigned int dest_align
1938 = get_pointer_alignment (dest
, BIGGEST_ALIGNMENT
);
1939 rtx dest_mem
, src_mem
, dest_addr
, len_rtx
;
1941 /* If DEST is not a pointer type, call the normal function. */
1942 if (dest_align
== 0)
1945 /* If the LEN parameter is zero, return DEST. */
1946 if (host_integerp (len
, 1) && tree_low_cst (len
, 1) == 0)
1948 /* Evaluate and ignore SRC in case it has side-effects. */
1949 expand_expr (src
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
1950 return expand_expr (dest
, target
, mode
, EXPAND_NORMAL
);
1953 /* If either SRC is not a pointer type, don't do this
1954 operation in-line. */
1958 dest_mem
= get_memory_rtx (dest
);
1959 set_mem_align (dest_mem
, dest_align
);
1960 len_rtx
= expand_expr (len
, NULL_RTX
, VOIDmode
, 0);
1961 src_str
= c_getstr (src
);
1963 /* If SRC is a string constant and block move would be done
1964 by pieces, we can avoid loading the string from memory
1965 and only stored the computed constants. */
1967 && GET_CODE (len_rtx
) == CONST_INT
1968 && (unsigned HOST_WIDE_INT
) INTVAL (len_rtx
) <= strlen (src_str
) + 1
1969 && can_store_by_pieces (INTVAL (len_rtx
), builtin_memcpy_read_str
,
1970 (PTR
) src_str
, dest_align
))
1972 store_by_pieces (dest_mem
, INTVAL (len_rtx
),
1973 builtin_memcpy_read_str
,
1974 (PTR
) src_str
, dest_align
);
1975 return force_operand (XEXP (dest_mem
, 0), NULL_RTX
);
1978 src_mem
= get_memory_rtx (src
);
1979 set_mem_align (src_mem
, src_align
);
1981 /* Copy word part most expediently. */
1982 dest_addr
= emit_block_move (dest_mem
, src_mem
, len_rtx
);
1985 dest_addr
= force_operand (XEXP (dest_mem
, 0), NULL_RTX
);
1991 /* Expand expression EXP, which is a call to the strcpy builtin. Return 0
1992 if we failed the caller should emit a normal call, otherwise try to get
1993 the result in TARGET, if convenient (and in mode MODE if that's
1997 expand_builtin_strcpy (exp
, target
, mode
)
2000 enum machine_mode mode
;
2002 tree arglist
= TREE_OPERAND (exp
, 1);
2005 if (!validate_arglist (arglist
, POINTER_TYPE
, POINTER_TYPE
, VOID_TYPE
))
2008 fn
= built_in_decls
[BUILT_IN_MEMCPY
];
2012 len
= c_strlen (TREE_VALUE (TREE_CHAIN (arglist
)));
2016 len
= size_binop (PLUS_EXPR
, len
, ssize_int (1));
2017 chainon (arglist
, build_tree_list (NULL_TREE
, len
));
2018 return expand_expr (build_function_call_expr (fn
, arglist
),
2019 target
, mode
, EXPAND_NORMAL
);
2022 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
2023 bytes from constant string DATA + OFFSET and return it as target
2027 builtin_strncpy_read_str (data
, offset
, mode
)
2029 HOST_WIDE_INT offset
;
2030 enum machine_mode mode
;
2032 const char *str
= (const char *) data
;
2034 if ((unsigned HOST_WIDE_INT
) offset
> strlen (str
))
2037 return c_readstr (str
+ offset
, mode
);
2040 /* Expand expression EXP, which is a call to the strncpy builtin. Return 0
2041 if we failed the caller should emit a normal call. */
2044 expand_builtin_strncpy (arglist
, target
, mode
)
2047 enum machine_mode mode
;
2049 if (!validate_arglist (arglist
,
2050 POINTER_TYPE
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
2054 tree slen
= c_strlen (TREE_VALUE (TREE_CHAIN (arglist
)));
2055 tree len
= TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist
)));
2058 /* We must be passed a constant len parameter. */
2059 if (TREE_CODE (len
) != INTEGER_CST
)
2062 /* If the len parameter is zero, return the dst parameter. */
2063 if (compare_tree_int (len
, 0) == 0)
2065 /* Evaluate and ignore the src argument in case it has
2067 expand_expr (TREE_VALUE (TREE_CHAIN (arglist
)), const0_rtx
,
2068 VOIDmode
, EXPAND_NORMAL
);
2069 /* Return the dst parameter. */
2070 return expand_expr (TREE_VALUE (arglist
), target
, mode
,
2074 /* Now, we must be passed a constant src ptr parameter. */
2075 if (slen
== 0 || TREE_CODE (slen
) != INTEGER_CST
)
2078 slen
= size_binop (PLUS_EXPR
, slen
, ssize_int (1));
2080 /* We're required to pad with trailing zeros if the requested
2081 len is greater than strlen(s2)+1. In that case try to
2082 use store_by_pieces, if it fails, punt. */
2083 if (tree_int_cst_lt (slen
, len
))
2085 tree dest
= TREE_VALUE (arglist
);
2086 unsigned int dest_align
2087 = get_pointer_alignment (dest
, BIGGEST_ALIGNMENT
);
2088 const char *p
= c_getstr (TREE_VALUE (TREE_CHAIN (arglist
)));
2091 if (!p
|| dest_align
== 0 || !host_integerp (len
, 1)
2092 || !can_store_by_pieces (tree_low_cst (len
, 1),
2093 builtin_strncpy_read_str
,
2094 (PTR
) p
, dest_align
))
2097 dest_mem
= get_memory_rtx (dest
);
2098 store_by_pieces (dest_mem
, tree_low_cst (len
, 1),
2099 builtin_strncpy_read_str
,
2100 (PTR
) p
, dest_align
);
2101 return force_operand (XEXP (dest_mem
, 0), NULL_RTX
);
2104 /* OK transform into builtin memcpy. */
2105 fn
= built_in_decls
[BUILT_IN_MEMCPY
];
2108 return expand_expr (build_function_call_expr (fn
, arglist
),
2109 target
, mode
, EXPAND_NORMAL
);
2113 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
2114 bytes from constant string DATA + OFFSET and return it as target
2118 builtin_memset_read_str (data
, offset
, mode
)
2120 HOST_WIDE_INT offset ATTRIBUTE_UNUSED
;
2121 enum machine_mode mode
;
2123 const char *c
= (const char *) data
;
2124 char *p
= alloca (GET_MODE_SIZE (mode
));
2126 memset (p
, *c
, GET_MODE_SIZE (mode
));
2128 return c_readstr (p
, mode
);
2131 /* Expand expression EXP, which is a call to the memset builtin. Return 0
2132 if we failed the caller should emit a normal call, otherwise try to get
2133 the result in TARGET, if convenient (and in mode MODE if that's
2137 expand_builtin_memset (exp
, target
, mode
)
2140 enum machine_mode mode
;
2142 tree arglist
= TREE_OPERAND (exp
, 1);
2144 if (!validate_arglist (arglist
,
2145 POINTER_TYPE
, INTEGER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
2149 tree dest
= TREE_VALUE (arglist
);
2150 tree val
= TREE_VALUE (TREE_CHAIN (arglist
));
2151 tree len
= TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist
)));
2154 unsigned int dest_align
2155 = get_pointer_alignment (dest
, BIGGEST_ALIGNMENT
);
2156 rtx dest_mem
, dest_addr
, len_rtx
;
2158 /* If DEST is not a pointer type, don't do this
2159 operation in-line. */
2160 if (dest_align
== 0)
2163 /* If the LEN parameter is zero, return DEST. */
2164 if (host_integerp (len
, 1) && tree_low_cst (len
, 1) == 0)
2166 /* Evaluate and ignore VAL in case it has side-effects. */
2167 expand_expr (val
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2168 return expand_expr (dest
, target
, mode
, EXPAND_NORMAL
);
2171 if (TREE_CODE (val
) != INTEGER_CST
)
2174 if (target_char_cast (val
, &c
))
2179 if (!host_integerp (len
, 1))
2181 if (!can_store_by_pieces (tree_low_cst (len
, 1),
2182 builtin_memset_read_str
, (PTR
) &c
,
2186 dest_mem
= get_memory_rtx (dest
);
2187 store_by_pieces (dest_mem
, tree_low_cst (len
, 1),
2188 builtin_memset_read_str
,
2189 (PTR
) &c
, dest_align
);
2190 return force_operand (XEXP (dest_mem
, 0), NULL_RTX
);
2193 len_rtx
= expand_expr (len
, NULL_RTX
, VOIDmode
, 0);
2195 dest_mem
= get_memory_rtx (dest
);
2196 set_mem_align (dest_mem
, dest_align
);
2197 dest_addr
= clear_storage (dest_mem
, len_rtx
);
2200 dest_addr
= force_operand (XEXP (dest_mem
, 0), NULL_RTX
);
2206 /* Expand expression EXP, which is a call to the bzero builtin. Return 0
2207 if we failed the caller should emit a normal call. */
2210 expand_builtin_bzero (exp
)
2213 tree arglist
= TREE_OPERAND (exp
, 1);
2214 tree dest
, size
, newarglist
;
2217 if (!validate_arglist (arglist
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
2220 dest
= TREE_VALUE (arglist
);
2221 size
= TREE_VALUE (TREE_CHAIN (arglist
));
2223 /* New argument list transforming bzero(ptr x, int y) to
2224 memset(ptr x, int 0, size_t y). This is done this way
2225 so that if it isn't expanded inline, we fallback to
2226 calling bzero instead of memset. */
2228 newarglist
= build_tree_list (NULL_TREE
, convert (sizetype
, size
));
2229 newarglist
= tree_cons (NULL_TREE
, integer_zero_node
, newarglist
);
2230 newarglist
= tree_cons (NULL_TREE
, dest
, newarglist
);
2232 TREE_OPERAND (exp
, 1) = newarglist
;
2233 result
= expand_builtin_memset (exp
, const0_rtx
, VOIDmode
);
2235 /* Always restore the original arguments. */
2236 TREE_OPERAND (exp
, 1) = arglist
;
2241 /* Expand expression EXP, which is a call to the memcmp or the strcmp builtin.
2242 ARGLIST is the argument list for this call. Return 0 if we failed and the
2243 caller should emit a normal call, otherwise try to get the result in
2244 TARGET, if convenient (and in mode MODE, if that's convenient). */
2247 expand_builtin_memcmp (exp
, arglist
, target
, mode
)
2251 enum machine_mode mode
;
2253 tree arg1
, arg2
, len
;
2255 if (!validate_arglist (arglist
,
2256 POINTER_TYPE
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
2259 arg1
= TREE_VALUE (arglist
);
2260 arg2
= TREE_VALUE (TREE_CHAIN (arglist
));
2261 len
= TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist
)));
2263 /* If the len parameter is zero, return zero. */
2264 if (host_integerp (len
, 1) && tree_low_cst (len
, 1) == 0)
2266 /* Evaluate and ignore arg1 and arg2 in case they have
2268 expand_expr (arg1
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2269 expand_expr (arg2
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2273 /* If len parameter is one, return an expression corresponding to
2274 (*(const unsigned char*)arg1 - (const unsigned char*)arg2). */
2275 if (host_integerp (len
, 1) && tree_low_cst (len
, 1) == 1)
2277 tree cst_uchar_node
= build_type_variant (unsigned_char_type_node
, 1, 0);
2278 tree cst_uchar_ptr_node
= build_pointer_type (cst_uchar_node
);
2280 fold (build1 (CONVERT_EXPR
, integer_type_node
,
2281 build1 (INDIRECT_REF
, cst_uchar_node
,
2282 build1 (NOP_EXPR
, cst_uchar_ptr_node
, arg1
))));
2284 fold (build1 (CONVERT_EXPR
, integer_type_node
,
2285 build1 (INDIRECT_REF
, cst_uchar_node
,
2286 build1 (NOP_EXPR
, cst_uchar_ptr_node
, arg2
))));
2287 tree result
= fold (build (MINUS_EXPR
, integer_type_node
, ind1
, ind2
));
2288 return expand_expr (result
, target
, mode
, EXPAND_NORMAL
);
2291 #ifdef HAVE_cmpstrsi
2293 rtx arg1_rtx
, arg2_rtx
, arg3_rtx
;
2298 = get_pointer_alignment (arg1
, BIGGEST_ALIGNMENT
) / BITS_PER_UNIT
;
2300 = get_pointer_alignment (arg2
, BIGGEST_ALIGNMENT
) / BITS_PER_UNIT
;
2301 enum machine_mode insn_mode
2302 = insn_data
[(int) CODE_FOR_cmpstrsi
].operand
[0].mode
;
2304 /* If we don't have POINTER_TYPE, call the function. */
2305 if (arg1_align
== 0 || arg2_align
== 0)
2308 /* Make a place to write the result of the instruction. */
2311 && GET_CODE (result
) == REG
&& GET_MODE (result
) == insn_mode
2312 && REGNO (result
) >= FIRST_PSEUDO_REGISTER
))
2313 result
= gen_reg_rtx (insn_mode
);
2315 arg1_rtx
= get_memory_rtx (arg1
);
2316 arg2_rtx
= get_memory_rtx (arg2
);
2317 arg3_rtx
= expand_expr (len
, NULL_RTX
, VOIDmode
, 0);
2321 insn
= gen_cmpstrsi (result
, arg1_rtx
, arg2_rtx
, arg3_rtx
,
2322 GEN_INT (MIN (arg1_align
, arg2_align
)));
2327 emit_library_call_value (memcmp_libfunc
, result
, LCT_PURE_MAKE_BLOCK
,
2328 TYPE_MODE (integer_type_node
), 3,
2329 XEXP (arg1_rtx
, 0), Pmode
,
2330 XEXP (arg2_rtx
, 0), Pmode
,
2331 convert_to_mode (TYPE_MODE (sizetype
), arg3_rtx
,
2332 TREE_UNSIGNED (sizetype
)),
2333 TYPE_MODE (sizetype
));
2335 /* Return the value in the proper mode for this function. */
2336 mode
= TYPE_MODE (TREE_TYPE (exp
));
2337 if (GET_MODE (result
) == mode
)
2339 else if (target
!= 0)
2341 convert_move (target
, result
, 0);
2345 return convert_to_mode (mode
, result
, 0);
2352 /* Expand expression EXP, which is a call to the strcmp builtin. Return 0
2353 if we failed the caller should emit a normal call, otherwise try to get
2354 the result in TARGET, if convenient. */
2357 expand_builtin_strcmp (exp
, target
, mode
)
2360 enum machine_mode mode
;
2362 tree arglist
= TREE_OPERAND (exp
, 1);
2363 tree arg1
, arg2
, len
, len2
, fn
;
2364 const char *p1
, *p2
;
2366 if (!validate_arglist (arglist
, POINTER_TYPE
, POINTER_TYPE
, VOID_TYPE
))
2369 arg1
= TREE_VALUE (arglist
);
2370 arg2
= TREE_VALUE (TREE_CHAIN (arglist
));
2372 p1
= c_getstr (arg1
);
2373 p2
= c_getstr (arg2
);
2377 const int i
= strcmp (p1
, p2
);
2378 return (i
< 0 ? constm1_rtx
: (i
> 0 ? const1_rtx
: const0_rtx
));
2381 /* If either arg is "", return an expression corresponding to
2382 (*(const unsigned char*)arg1 - (const unsigned char*)arg2). */
2383 if ((p1
&& *p1
== '\0') || (p2
&& *p2
== '\0'))
2385 tree cst_uchar_node
= build_type_variant (unsigned_char_type_node
, 1, 0);
2386 tree cst_uchar_ptr_node
= build_pointer_type (cst_uchar_node
);
2388 fold (build1 (CONVERT_EXPR
, integer_type_node
,
2389 build1 (INDIRECT_REF
, cst_uchar_node
,
2390 build1 (NOP_EXPR
, cst_uchar_ptr_node
, arg1
))));
2392 fold (build1 (CONVERT_EXPR
, integer_type_node
,
2393 build1 (INDIRECT_REF
, cst_uchar_node
,
2394 build1 (NOP_EXPR
, cst_uchar_ptr_node
, arg2
))));
2395 tree result
= fold (build (MINUS_EXPR
, integer_type_node
, ind1
, ind2
));
2396 return expand_expr (result
, target
, mode
, EXPAND_NORMAL
);
2399 len
= c_strlen (arg1
);
2400 len2
= c_strlen (arg2
);
2403 len
= size_binop (PLUS_EXPR
, ssize_int (1), len
);
2406 len2
= size_binop (PLUS_EXPR
, ssize_int (1), len2
);
2408 /* If we don't have a constant length for the first, use the length
2409 of the second, if we know it. We don't require a constant for
2410 this case; some cost analysis could be done if both are available
2411 but neither is constant. For now, assume they're equally cheap
2412 unless one has side effects.
2414 If both strings have constant lengths, use the smaller. This
2415 could arise if optimization results in strcpy being called with
2416 two fixed strings, or if the code was machine-generated. We should
2417 add some code to the `memcmp' handler below to deal with such
2418 situations, someday. */
2420 if (!len
|| TREE_CODE (len
) != INTEGER_CST
)
2422 if (len2
&& !TREE_SIDE_EFFECTS (len2
))
2427 else if (len2
&& TREE_CODE (len2
) == INTEGER_CST
2428 && tree_int_cst_lt (len2
, len
))
2431 /* If both arguments have side effects, we cannot optimize. */
2432 if (TREE_SIDE_EFFECTS (len
))
2435 fn
= built_in_decls
[BUILT_IN_MEMCMP
];
2439 chainon (arglist
, build_tree_list (NULL_TREE
, len
));
2440 return expand_expr (build_function_call_expr (fn
, arglist
),
2441 target
, mode
, EXPAND_NORMAL
);
2444 /* Expand expression EXP, which is a call to the strncmp builtin. Return 0
2445 if we failed the caller should emit a normal call, otherwise try to get
2446 the result in TARGET, if convenient. */
2449 expand_builtin_strncmp (exp
, target
, mode
)
2452 enum machine_mode mode
;
2454 tree arglist
= TREE_OPERAND (exp
, 1);
2455 tree fn
, newarglist
, len
= 0;
2456 tree arg1
, arg2
, arg3
;
2457 const char *p1
, *p2
;
2459 if (!validate_arglist (arglist
,
2460 POINTER_TYPE
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
2463 arg1
= TREE_VALUE (arglist
);
2464 arg2
= TREE_VALUE (TREE_CHAIN (arglist
));
2465 arg3
= TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist
)));
2467 /* If the len parameter is zero, return zero. */
2468 if (host_integerp (arg3
, 1) && tree_low_cst (arg3
, 1) == 0)
2470 /* Evaluate and ignore arg1 and arg2 in case they have
2472 expand_expr (arg1
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2473 expand_expr (arg2
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2477 p1
= c_getstr (arg1
);
2478 p2
= c_getstr (arg2
);
2480 /* If all arguments are constant, evaluate at compile-time. */
2481 if (host_integerp (arg3
, 1) && p1
&& p2
)
2483 const int r
= strncmp (p1
, p2
, tree_low_cst (arg3
, 1));
2484 return (r
< 0 ? constm1_rtx
: (r
> 0 ? const1_rtx
: const0_rtx
));
2487 /* If len == 1 or (either string parameter is "" and (len >= 1)),
2488 return (*(const u_char*)arg1 - *(const u_char*)arg2). */
2489 if (host_integerp (arg3
, 1)
2490 && (tree_low_cst (arg3
, 1) == 1
2491 || (tree_low_cst (arg3
, 1) > 1
2492 && ((p1
&& *p1
== '\0') || (p2
&& *p2
== '\0')))))
2494 tree cst_uchar_node
= build_type_variant (unsigned_char_type_node
, 1, 0);
2495 tree cst_uchar_ptr_node
= build_pointer_type (cst_uchar_node
);
2497 fold (build1 (CONVERT_EXPR
, integer_type_node
,
2498 build1 (INDIRECT_REF
, cst_uchar_node
,
2499 build1 (NOP_EXPR
, cst_uchar_ptr_node
, arg1
))));
2501 fold (build1 (CONVERT_EXPR
, integer_type_node
,
2502 build1 (INDIRECT_REF
, cst_uchar_node
,
2503 build1 (NOP_EXPR
, cst_uchar_ptr_node
, arg2
))));
2504 tree result
= fold (build (MINUS_EXPR
, integer_type_node
, ind1
, ind2
));
2505 return expand_expr (result
, target
, mode
, EXPAND_NORMAL
);
2508 /* If c_strlen can determine an expression for one of the string
2509 lengths, and it doesn't have side effects, then call
2510 expand_builtin_memcmp() using length MIN(strlen(string)+1, arg3). */
2512 /* Perhaps one of the strings is really constant, if so prefer
2513 that constant length over the other string's length. */
2515 len
= c_strlen (arg1
);
2517 len
= c_strlen (arg2
);
2519 /* If we still don't have a len, try either string arg as long
2520 as they don't have side effects. */
2521 if (!len
&& !TREE_SIDE_EFFECTS (arg1
))
2522 len
= c_strlen (arg1
);
2523 if (!len
&& !TREE_SIDE_EFFECTS (arg2
))
2524 len
= c_strlen (arg2
);
2525 /* If we still don't have a length, punt. */
2529 fn
= built_in_decls
[BUILT_IN_MEMCMP
];
2533 /* Add one to the string length. */
2534 len
= fold (size_binop (PLUS_EXPR
, len
, ssize_int (1)));
2536 /* The actual new length parameter is MIN(len,arg3). */
2537 len
= fold (build (MIN_EXPR
, TREE_TYPE (len
), len
, arg3
));
2539 newarglist
= build_tree_list (NULL_TREE
, len
);
2540 newarglist
= tree_cons (NULL_TREE
, arg2
, newarglist
);
2541 newarglist
= tree_cons (NULL_TREE
, arg1
, newarglist
);
2542 return expand_expr (build_function_call_expr (fn
, newarglist
),
2543 target
, mode
, EXPAND_NORMAL
);
2546 /* Expand expression EXP, which is a call to the strcat builtin.
2547 Return 0 if we failed the caller should emit a normal call,
2548 otherwise try to get the result in TARGET, if convenient. */
2551 expand_builtin_strcat (arglist
, target
, mode
)
2554 enum machine_mode mode
;
2556 if (!validate_arglist (arglist
, POINTER_TYPE
, POINTER_TYPE
, VOID_TYPE
))
2560 tree dst
= TREE_VALUE (arglist
),
2561 src
= TREE_VALUE (TREE_CHAIN (arglist
));
2562 const char *p
= c_getstr (src
);
2564 /* If the string length is zero, return the dst parameter. */
2565 if (p
&& *p
== '\0')
2566 return expand_expr (dst
, target
, mode
, EXPAND_NORMAL
);
2572 /* Expand expression EXP, which is a call to the strncat builtin.
2573 Return 0 if we failed the caller should emit a normal call,
2574 otherwise try to get the result in TARGET, if convenient. */
2577 expand_builtin_strncat (arglist
, target
, mode
)
2580 enum machine_mode mode
;
2582 if (!validate_arglist (arglist
,
2583 POINTER_TYPE
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
2587 tree dst
= TREE_VALUE (arglist
),
2588 src
= TREE_VALUE (TREE_CHAIN (arglist
)),
2589 len
= TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist
)));
2590 const char *p
= c_getstr (src
);
2592 /* If the requested length is zero, or the src parameter string
2593 length is zero, return the dst parameter. */
2594 if ((TREE_CODE (len
) == INTEGER_CST
&& compare_tree_int (len
, 0) == 0)
2595 || (p
&& *p
== '\0'))
2597 /* Evaluate and ignore the src and len parameters in case
2598 they have side-effects. */
2599 expand_expr (src
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2600 expand_expr (len
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2601 return expand_expr (dst
, target
, mode
, EXPAND_NORMAL
);
2604 /* If the requested len is greater than or equal to the string
2605 length, call strcat. */
2606 if (TREE_CODE (len
) == INTEGER_CST
&& p
2607 && compare_tree_int (len
, strlen (p
)) >= 0)
2610 tree_cons (NULL_TREE
, dst
, build_tree_list (NULL_TREE
, src
)),
2611 fn
= built_in_decls
[BUILT_IN_STRCAT
];
2613 /* If the replacement _DECL isn't initialized, don't do the
2618 return expand_expr (build_function_call_expr (fn
, newarglist
),
2619 target
, mode
, EXPAND_NORMAL
);
2625 /* Expand expression EXP, which is a call to the strspn builtin.
2626 Return 0 if we failed the caller should emit a normal call,
2627 otherwise try to get the result in TARGET, if convenient. */
2630 expand_builtin_strspn (arglist
, target
, mode
)
2633 enum machine_mode mode
;
2635 if (!validate_arglist (arglist
, POINTER_TYPE
, POINTER_TYPE
, VOID_TYPE
))
2639 tree s1
= TREE_VALUE (arglist
), s2
= TREE_VALUE (TREE_CHAIN (arglist
));
2640 const char *p1
= c_getstr (s1
), *p2
= c_getstr (s2
);
2642 /* If both arguments are constants, evaluate at compile-time. */
2645 const size_t r
= strspn (p1
, p2
);
2646 return expand_expr (size_int (r
), target
, mode
, EXPAND_NORMAL
);
2649 /* If either argument is "", return 0. */
2650 if ((p1
&& *p1
== '\0') || (p2
&& *p2
== '\0'))
2652 /* Evaluate and ignore both arguments in case either one has
2654 expand_expr (s1
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2655 expand_expr (s2
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2662 /* Expand expression EXP, which is a call to the strcspn builtin.
2663 Return 0 if we failed the caller should emit a normal call,
2664 otherwise try to get the result in TARGET, if convenient. */
2667 expand_builtin_strcspn (arglist
, target
, mode
)
2670 enum machine_mode mode
;
2672 if (!validate_arglist (arglist
, POINTER_TYPE
, POINTER_TYPE
, VOID_TYPE
))
2676 tree s1
= TREE_VALUE (arglist
), s2
= TREE_VALUE (TREE_CHAIN (arglist
));
2677 const char *p1
= c_getstr (s1
), *p2
= c_getstr (s2
);
2679 /* If both arguments are constants, evaluate at compile-time. */
2682 const size_t r
= strcspn (p1
, p2
);
2683 return expand_expr (size_int (r
), target
, mode
, EXPAND_NORMAL
);
2686 /* If the first argument is "", return 0. */
2687 if (p1
&& *p1
== '\0')
2689 /* Evaluate and ignore argument s2 in case it has
2691 expand_expr (s2
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2695 /* If the second argument is "", return __builtin_strlen(s1). */
2696 if (p2
&& *p2
== '\0')
2698 tree newarglist
= build_tree_list (NULL_TREE
, s1
),
2699 fn
= built_in_decls
[BUILT_IN_STRLEN
];
2701 /* If the replacement _DECL isn't initialized, don't do the
2706 return expand_expr (build_function_call_expr (fn
, newarglist
),
2707 target
, mode
, EXPAND_NORMAL
);
2713 /* Expand a call to __builtin_saveregs, generating the result in TARGET,
2714 if that's convenient. */
2717 expand_builtin_saveregs ()
2721 /* Don't do __builtin_saveregs more than once in a function.
2722 Save the result of the first call and reuse it. */
2723 if (saveregs_value
!= 0)
2724 return saveregs_value
;
2726 /* When this function is called, it means that registers must be
2727 saved on entry to this function. So we migrate the call to the
2728 first insn of this function. */
2732 #ifdef EXPAND_BUILTIN_SAVEREGS
2733 /* Do whatever the machine needs done in this case. */
2734 val
= EXPAND_BUILTIN_SAVEREGS ();
2736 /* ??? We used to try and build up a call to the out of line function,
2737 guessing about what registers needed saving etc. This became much
2738 harder with __builtin_va_start, since we don't have a tree for a
2739 call to __builtin_saveregs to fall back on. There was exactly one
2740 port (i860) that used this code, and I'm unconvinced it could actually
2741 handle the general case. So we no longer try to handle anything
2742 weird and make the backend absorb the evil. */
2744 error ("__builtin_saveregs not supported by this target");
2751 saveregs_value
= val
;
2753 /* Put the sequence after the NOTE that starts the function. If this
2754 is inside a SEQUENCE, make the outer-level insn chain current, so
2755 the code is placed at the start of the function. */
2756 push_topmost_sequence ();
2757 emit_insns_after (seq
, get_insns ());
2758 pop_topmost_sequence ();
2763 /* __builtin_args_info (N) returns word N of the arg space info
2764 for the current function. The number and meanings of words
2765 is controlled by the definition of CUMULATIVE_ARGS. */
2768 expand_builtin_args_info (exp
)
2771 tree arglist
= TREE_OPERAND (exp
, 1);
2772 int nwords
= sizeof (CUMULATIVE_ARGS
) / sizeof (int);
2773 int *word_ptr
= (int *) ¤t_function_args_info
;
2775 /* These are used by the code below that is if 0'ed away */
2777 tree type
, elts
, result
;
2780 if (sizeof (CUMULATIVE_ARGS
) % sizeof (int) != 0)
2785 if (!host_integerp (TREE_VALUE (arglist
), 0))
2786 error ("argument of `__builtin_args_info' must be constant");
2789 HOST_WIDE_INT wordnum
= tree_low_cst (TREE_VALUE (arglist
), 0);
2791 if (wordnum
< 0 || wordnum
>= nwords
)
2792 error ("argument of `__builtin_args_info' out of range");
2794 return GEN_INT (word_ptr
[wordnum
]);
2798 error ("missing argument in `__builtin_args_info'");
2803 for (i
= 0; i
< nwords
; i
++)
2804 elts
= tree_cons (NULL_TREE
, build_int_2 (word_ptr
[i
], 0));
2806 type
= build_array_type (integer_type_node
,
2807 build_index_type (build_int_2 (nwords
, 0)));
2808 result
= build (CONSTRUCTOR
, type
, NULL_TREE
, nreverse (elts
));
2809 TREE_CONSTANT (result
) = 1;
2810 TREE_STATIC (result
) = 1;
2811 result
= build1 (INDIRECT_REF
, build_pointer_type (type
), result
);
2812 TREE_CONSTANT (result
) = 1;
2813 return expand_expr (result
, NULL_RTX
, VOIDmode
, 0);
2817 /* Expand ARGLIST, from a call to __builtin_next_arg. */
2820 expand_builtin_next_arg (arglist
)
2823 tree fntype
= TREE_TYPE (current_function_decl
);
2825 if ((TYPE_ARG_TYPES (fntype
) == 0
2826 || (TREE_VALUE (tree_last (TYPE_ARG_TYPES (fntype
)))
2828 && ! current_function_varargs
)
2830 error ("`va_start' used in function with fixed args");
2836 tree last_parm
= tree_last (DECL_ARGUMENTS (current_function_decl
));
2837 tree arg
= TREE_VALUE (arglist
);
2839 /* Strip off all nops for the sake of the comparison. This
2840 is not quite the same as STRIP_NOPS. It does more.
2841 We must also strip off INDIRECT_EXPR for C++ reference
2843 while (TREE_CODE (arg
) == NOP_EXPR
2844 || TREE_CODE (arg
) == CONVERT_EXPR
2845 || TREE_CODE (arg
) == NON_LVALUE_EXPR
2846 || TREE_CODE (arg
) == INDIRECT_REF
)
2847 arg
= TREE_OPERAND (arg
, 0);
2848 if (arg
!= last_parm
)
2849 warning ("second parameter of `va_start' not last named argument");
2851 else if (! current_function_varargs
)
2852 /* Evidently an out of date version of <stdarg.h>; can't validate
2853 va_start's second argument, but can still work as intended. */
2854 warning ("`__builtin_next_arg' called without an argument");
2856 return expand_binop (Pmode
, add_optab
,
2857 current_function_internal_arg_pointer
,
2858 current_function_arg_offset_rtx
,
2859 NULL_RTX
, 0, OPTAB_LIB_WIDEN
);
2862 /* Make it easier for the backends by protecting the valist argument
2863 from multiple evaluations. */
2866 stabilize_va_list (valist
, needs_lvalue
)
2870 if (TREE_CODE (va_list_type_node
) == ARRAY_TYPE
)
2872 if (TREE_SIDE_EFFECTS (valist
))
2873 valist
= save_expr (valist
);
2875 /* For this case, the backends will be expecting a pointer to
2876 TREE_TYPE (va_list_type_node), but it's possible we've
2877 actually been given an array (an actual va_list_type_node).
2879 if (TREE_CODE (TREE_TYPE (valist
)) == ARRAY_TYPE
)
2881 tree p1
= build_pointer_type (TREE_TYPE (va_list_type_node
));
2882 tree p2
= build_pointer_type (va_list_type_node
);
2884 valist
= build1 (ADDR_EXPR
, p2
, valist
);
2885 valist
= fold (build1 (NOP_EXPR
, p1
, valist
));
2894 if (! TREE_SIDE_EFFECTS (valist
))
2897 pt
= build_pointer_type (va_list_type_node
);
2898 valist
= fold (build1 (ADDR_EXPR
, pt
, valist
));
2899 TREE_SIDE_EFFECTS (valist
) = 1;
2902 if (TREE_SIDE_EFFECTS (valist
))
2903 valist
= save_expr (valist
);
2904 valist
= fold (build1 (INDIRECT_REF
, TREE_TYPE (TREE_TYPE (valist
)),
2911 /* The "standard" implementation of va_start: just assign `nextarg' to
2915 std_expand_builtin_va_start (stdarg_p
, valist
, nextarg
)
2924 /* The dummy named parameter is declared as a 'word' sized
2925 object, but if a 'word' is smaller than an 'int', it would
2926 have been promoted to int when it was added to the arglist. */
2927 int align
= PARM_BOUNDARY
/ BITS_PER_UNIT
;
2928 int size
= MAX (UNITS_PER_WORD
,
2929 GET_MODE_SIZE (TYPE_MODE (integer_type_node
)));
2930 int offset
= ((size
+ align
- 1) / align
) * align
;
2931 nextarg
= plus_constant (nextarg
, -offset
);
2934 t
= build (MODIFY_EXPR
, TREE_TYPE (valist
), valist
,
2935 make_tree (ptr_type_node
, nextarg
));
2936 TREE_SIDE_EFFECTS (t
) = 1;
2938 expand_expr (t
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
2941 /* Expand ARGLIST, which from a call to __builtin_stdarg_va_start or
2942 __builtin_varargs_va_start, depending on STDARG_P. */
2945 expand_builtin_va_start (stdarg_p
, arglist
)
2950 tree chain
= arglist
, valist
;
2953 nextarg
= expand_builtin_next_arg (chain
= TREE_CHAIN (arglist
));
2955 nextarg
= expand_builtin_next_arg (NULL_TREE
);
2957 if (TREE_CHAIN (chain
))
2958 error ("too many arguments to function `va_start'");
2960 valist
= stabilize_va_list (TREE_VALUE (arglist
), 1);
2962 #ifdef EXPAND_BUILTIN_VA_START
2963 EXPAND_BUILTIN_VA_START (stdarg_p
, valist
, nextarg
);
2965 std_expand_builtin_va_start (stdarg_p
, valist
, nextarg
);
2971 /* The "standard" implementation of va_arg: read the value from the
2972 current (padded) address and increment by the (padded) size. */
2975 std_expand_builtin_va_arg (valist
, type
)
2979 HOST_WIDE_INT align
;
2980 HOST_WIDE_INT rounded_size
;
2983 /* Compute the rounded size of the type. */
2984 align
= PARM_BOUNDARY
/ BITS_PER_UNIT
;
2985 rounded_size
= (((int_size_in_bytes (type
) + align
- 1) / align
) * align
);
2989 if (PAD_VARARGS_DOWN
)
2991 /* Small args are padded downward. */
2994 = rounded_size
> align
? rounded_size
: int_size_in_bytes (type
);
2996 addr_tree
= build (PLUS_EXPR
, TREE_TYPE (addr_tree
), addr_tree
,
2997 build_int_2 (rounded_size
- adj
, 0));
3000 addr
= expand_expr (addr_tree
, NULL_RTX
, Pmode
, EXPAND_NORMAL
);
3001 addr
= copy_to_reg (addr
);
3003 /* Compute new value for AP. */
3004 t
= build (MODIFY_EXPR
, TREE_TYPE (valist
), valist
,
3005 build (PLUS_EXPR
, TREE_TYPE (valist
), valist
,
3006 build_int_2 (rounded_size
, 0)));
3007 TREE_SIDE_EFFECTS (t
) = 1;
3008 expand_expr (t
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
3013 /* Expand __builtin_va_arg, which is not really a builtin function, but
3014 a very special sort of operator. */
3017 expand_builtin_va_arg (valist
, type
)
3021 tree promoted_type
, want_va_type
, have_va_type
;
3023 /* Verify that valist is of the proper type. */
3025 want_va_type
= va_list_type_node
;
3026 have_va_type
= TREE_TYPE (valist
);
3027 if (TREE_CODE (want_va_type
) == ARRAY_TYPE
)
3029 /* If va_list is an array type, the argument may have decayed
3030 to a pointer type, e.g. by being passed to another function.
3031 In that case, unwrap both types so that we can compare the
3032 underlying records. */
3033 if (TREE_CODE (have_va_type
) == ARRAY_TYPE
3034 || TREE_CODE (have_va_type
) == POINTER_TYPE
)
3036 want_va_type
= TREE_TYPE (want_va_type
);
3037 have_va_type
= TREE_TYPE (have_va_type
);
3040 if (TYPE_MAIN_VARIANT (want_va_type
) != TYPE_MAIN_VARIANT (have_va_type
))
3042 error ("first argument to `va_arg' not of type `va_list'");
3046 /* Generate a diagnostic for requesting data of a type that cannot
3047 be passed through `...' due to type promotion at the call site. */
3048 else if ((promoted_type
= (*lang_type_promotes_to
) (type
)) != NULL_TREE
)
3050 const char *name
= "<anonymous type>", *pname
= 0;
3051 static int gave_help
;
3053 if (TYPE_NAME (type
))
3055 if (TREE_CODE (TYPE_NAME (type
)) == IDENTIFIER_NODE
)
3056 name
= IDENTIFIER_POINTER (TYPE_NAME (type
));
3057 else if (TREE_CODE (TYPE_NAME (type
)) == TYPE_DECL
3058 && DECL_NAME (TYPE_NAME (type
)))
3059 name
= IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type
)));
3061 if (TYPE_NAME (promoted_type
))
3063 if (TREE_CODE (TYPE_NAME (promoted_type
)) == IDENTIFIER_NODE
)
3064 pname
= IDENTIFIER_POINTER (TYPE_NAME (promoted_type
));
3065 else if (TREE_CODE (TYPE_NAME (promoted_type
)) == TYPE_DECL
3066 && DECL_NAME (TYPE_NAME (promoted_type
)))
3067 pname
= IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (promoted_type
)));
3070 error ("`%s' is promoted to `%s' when passed through `...'", name
, pname
);
3074 error ("(so you should pass `%s' not `%s' to `va_arg')", pname
, name
);
3081 /* Make it easier for the backends by protecting the valist argument
3082 from multiple evaluations. */
3083 valist
= stabilize_va_list (valist
, 0);
3085 #ifdef EXPAND_BUILTIN_VA_ARG
3086 addr
= EXPAND_BUILTIN_VA_ARG (valist
, type
);
3088 addr
= std_expand_builtin_va_arg (valist
, type
);
3092 #ifdef POINTERS_EXTEND_UNSIGNED
3093 if (GET_MODE (addr
) != Pmode
)
3094 addr
= convert_memory_address (Pmode
, addr
);
3097 result
= gen_rtx_MEM (TYPE_MODE (type
), addr
);
3098 set_mem_alias_set (result
, get_varargs_alias_set ());
3103 /* Expand ARGLIST, from a call to __builtin_va_end. */
3106 expand_builtin_va_end (arglist
)
3109 tree valist
= TREE_VALUE (arglist
);
3111 #ifdef EXPAND_BUILTIN_VA_END
3112 valist
= stabilize_va_list (valist
, 0);
3113 EXPAND_BUILTIN_VA_END(arglist
);
3115 /* Evaluate for side effects, if needed. I hate macros that don't
3117 if (TREE_SIDE_EFFECTS (valist
))
3118 expand_expr (valist
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
3124 /* Expand ARGLIST, from a call to __builtin_va_copy. We do this as a
3125 builtin rather than just as an assignment in stdarg.h because of the
3126 nastiness of array-type va_list types. */
3129 expand_builtin_va_copy (arglist
)
3134 dst
= TREE_VALUE (arglist
);
3135 src
= TREE_VALUE (TREE_CHAIN (arglist
));
3137 dst
= stabilize_va_list (dst
, 1);
3138 src
= stabilize_va_list (src
, 0);
3140 if (TREE_CODE (va_list_type_node
) != ARRAY_TYPE
)
3142 t
= build (MODIFY_EXPR
, va_list_type_node
, dst
, src
);
3143 TREE_SIDE_EFFECTS (t
) = 1;
3144 expand_expr (t
, const0_rtx
, VOIDmode
, EXPAND_NORMAL
);
3148 rtx dstb
, srcb
, size
;
3150 /* Evaluate to pointers. */
3151 dstb
= expand_expr (dst
, NULL_RTX
, Pmode
, EXPAND_NORMAL
);
3152 srcb
= expand_expr (src
, NULL_RTX
, Pmode
, EXPAND_NORMAL
);
3153 size
= expand_expr (TYPE_SIZE_UNIT (va_list_type_node
), NULL_RTX
,
3154 VOIDmode
, EXPAND_NORMAL
);
3156 #ifdef POINTERS_EXTEND_UNSIGNED
3157 if (GET_MODE (dstb
) != Pmode
)
3158 dstb
= convert_memory_address (Pmode
, dstb
);
3160 if (GET_MODE (srcb
) != Pmode
)
3161 srcb
= convert_memory_address (Pmode
, srcb
);
3164 /* "Dereference" to BLKmode memories. */
3165 dstb
= gen_rtx_MEM (BLKmode
, dstb
);
3166 set_mem_alias_set (dstb
, get_alias_set (TREE_TYPE (TREE_TYPE (dst
))));
3167 set_mem_align (dstb
, TYPE_ALIGN (va_list_type_node
));
3168 srcb
= gen_rtx_MEM (BLKmode
, srcb
);
3169 set_mem_alias_set (srcb
, get_alias_set (TREE_TYPE (TREE_TYPE (src
))));
3170 set_mem_align (srcb
, TYPE_ALIGN (va_list_type_node
));
3173 emit_block_move (dstb
, srcb
, size
);
3179 /* Expand a call to one of the builtin functions __builtin_frame_address or
3180 __builtin_return_address. */
3183 expand_builtin_frame_address (exp
)
3186 tree fndecl
= TREE_OPERAND (TREE_OPERAND (exp
, 0), 0);
3187 tree arglist
= TREE_OPERAND (exp
, 1);
3189 /* The argument must be a nonnegative integer constant.
3190 It counts the number of frames to scan up the stack.
3191 The value is the return address saved in that frame. */
3193 /* Warning about missing arg was already issued. */
3195 else if (! host_integerp (TREE_VALUE (arglist
), 1))
3197 if (DECL_FUNCTION_CODE (fndecl
) == BUILT_IN_FRAME_ADDRESS
)
3198 error ("invalid arg to `__builtin_frame_address'");
3200 error ("invalid arg to `__builtin_return_address'");
3206 = expand_builtin_return_addr (DECL_FUNCTION_CODE (fndecl
),
3207 tree_low_cst (TREE_VALUE (arglist
), 1),
3208 hard_frame_pointer_rtx
);
3210 /* Some ports cannot access arbitrary stack frames. */
3213 if (DECL_FUNCTION_CODE (fndecl
) == BUILT_IN_FRAME_ADDRESS
)
3214 warning ("unsupported arg to `__builtin_frame_address'");
3216 warning ("unsupported arg to `__builtin_return_address'");
3220 /* For __builtin_frame_address, return what we've got. */
3221 if (DECL_FUNCTION_CODE (fndecl
) == BUILT_IN_FRAME_ADDRESS
)
3224 if (GET_CODE (tem
) != REG
3225 && ! CONSTANT_P (tem
))
3226 tem
= copy_to_mode_reg (Pmode
, tem
);
3231 /* Expand a call to the alloca builtin, with arguments ARGLIST. Return 0 if
3232 we failed and the caller should emit a normal call, otherwise try to get
3233 the result in TARGET, if convenient. */
3236 expand_builtin_alloca (arglist
, target
)
3243 if (!validate_arglist (arglist
, INTEGER_TYPE
, VOID_TYPE
))
3246 /* Compute the argument. */
3247 op0
= expand_expr (TREE_VALUE (arglist
), NULL_RTX
, VOIDmode
, 0);
3249 /* Allocate the desired space. */
3250 result
= allocate_dynamic_stack_space (op0
, target
, BITS_PER_UNIT
);
3252 #ifdef POINTERS_EXTEND_UNSIGNED
3253 if (GET_MODE (result
) != ptr_mode
)
3254 result
= convert_memory_address (ptr_mode
, result
);
3260 /* Expand a call to the ffs builtin. The arguments are in ARGLIST.
3261 Return 0 if a normal call should be emitted rather than expanding the
3262 function in-line. If convenient, the result should be placed in TARGET.
3263 SUBTARGET may be used as the target for computing one of EXP's operands. */
3266 expand_builtin_ffs (arglist
, target
, subtarget
)
3268 rtx target
, subtarget
;
3271 if (!validate_arglist (arglist
, INTEGER_TYPE
, VOID_TYPE
))
3274 /* Compute the argument. */
3275 op0
= expand_expr (TREE_VALUE (arglist
), subtarget
, VOIDmode
, 0);
3276 /* Compute ffs, into TARGET if possible.
3277 Set TARGET to wherever the result comes back. */
3278 target
= expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist
))),
3279 ffs_optab
, op0
, target
, 1);
3285 /* If the string passed to fputs is a constant and is one character
3286 long, we attempt to transform this call into __builtin_fputc(). */
3289 expand_builtin_fputs (arglist
, ignore
)
3293 tree len
, fn
, fn_fputc
= built_in_decls
[BUILT_IN_FPUTC
],
3294 fn_fwrite
= built_in_decls
[BUILT_IN_FWRITE
];
3296 /* If the return value is used, or the replacement _DECL isn't
3297 initialized, don't do the transformation. */
3298 if (!ignore
|| !fn_fputc
|| !fn_fwrite
)
3301 /* Verify the arguments in the original call. */
3302 if (!validate_arglist (arglist
, POINTER_TYPE
, POINTER_TYPE
, VOID_TYPE
))
3305 /* Get the length of the string passed to fputs. If the length
3306 can't be determined, punt. */
3307 if (!(len
= c_strlen (TREE_VALUE (arglist
)))
3308 || TREE_CODE (len
) != INTEGER_CST
)
3311 switch (compare_tree_int (len
, 1))
3313 case -1: /* length is 0, delete the call entirely . */
3315 /* Evaluate and ignore the argument in case it has
3317 expand_expr (TREE_VALUE (TREE_CHAIN (arglist
)), const0_rtx
,
3318 VOIDmode
, EXPAND_NORMAL
);
3321 case 0: /* length is 1, call fputc. */
3323 const char *p
= c_getstr (TREE_VALUE (arglist
));
3327 /* New argument list transforming fputs(string, stream) to
3328 fputc(string[0], stream). */
3330 build_tree_list (NULL_TREE
, TREE_VALUE (TREE_CHAIN (arglist
)));
3332 tree_cons (NULL_TREE
, build_int_2 (p
[0], 0), arglist
);
3338 case 1: /* length is greater than 1, call fwrite. */
3340 tree string_arg
= TREE_VALUE (arglist
);
3342 /* New argument list transforming fputs(string, stream) to
3343 fwrite(string, 1, len, stream). */
3344 arglist
= build_tree_list (NULL_TREE
, TREE_VALUE (TREE_CHAIN (arglist
)));
3345 arglist
= tree_cons (NULL_TREE
, len
, arglist
);
3346 arglist
= tree_cons (NULL_TREE
, size_one_node
, arglist
);
3347 arglist
= tree_cons (NULL_TREE
, string_arg
, arglist
);
3355 return expand_expr (build_function_call_expr (fn
, arglist
),
3356 (ignore
? const0_rtx
: NULL_RTX
),
3357 VOIDmode
, EXPAND_NORMAL
);
3360 /* Expand a call to __builtin_expect. We return our argument and emit a
3361 NOTE_INSN_EXPECTED_VALUE note. This is the expansion of __builtin_expect in
3362 a non-jump context. */
3365 expand_builtin_expect (arglist
, target
)
3372 if (arglist
== NULL_TREE
3373 || TREE_CHAIN (arglist
) == NULL_TREE
)
3375 exp
= TREE_VALUE (arglist
);
3376 c
= TREE_VALUE (TREE_CHAIN (arglist
));
3378 if (TREE_CODE (c
) != INTEGER_CST
)
3380 error ("second arg to `__builtin_expect' must be a constant");
3381 c
= integer_zero_node
;
3384 target
= expand_expr (exp
, target
, VOIDmode
, EXPAND_NORMAL
);
3386 /* Don't bother with expected value notes for integral constants. */
3387 if (GET_CODE (target
) != CONST_INT
)
3389 /* We do need to force this into a register so that we can be
3390 moderately sure to be able to correctly interpret the branch
3392 target
= force_reg (GET_MODE (target
), target
);
3394 rtx_c
= expand_expr (c
, NULL_RTX
, GET_MODE (target
), EXPAND_NORMAL
);
3396 note
= emit_note (NULL
, NOTE_INSN_EXPECTED_VALUE
);
3397 NOTE_EXPECTED_VALUE (note
) = gen_rtx_EQ (VOIDmode
, target
, rtx_c
);
3403 /* Like expand_builtin_expect, except do this in a jump context. This is
3404 called from do_jump if the conditional is a __builtin_expect. Return either
3405 a SEQUENCE of insns to emit the jump or NULL if we cannot optimize
3406 __builtin_expect. We need to optimize this at jump time so that machines
3407 like the PowerPC don't turn the test into a SCC operation, and then jump
3408 based on the test being 0/1. */
3411 expand_builtin_expect_jump (exp
, if_false_label
, if_true_label
)
3416 tree arglist
= TREE_OPERAND (exp
, 1);
3417 tree arg0
= TREE_VALUE (arglist
);
3418 tree arg1
= TREE_VALUE (TREE_CHAIN (arglist
));
3421 /* Only handle __builtin_expect (test, 0) and
3422 __builtin_expect (test, 1). */
3423 if (TREE_CODE (TREE_TYPE (arg1
)) == INTEGER_TYPE
3424 && (integer_zerop (arg1
) || integer_onep (arg1
)))
3429 /* If we fail to locate an appropriate conditional jump, we'll
3430 fall back to normal evaluation. Ensure that the expression
3431 can be re-evaluated. */
3432 switch (unsafe_for_reeval (arg0
))
3437 case 1: /* Mildly unsafe. */
3438 arg0
= unsave_expr (arg0
);
3441 case 2: /* Wildly unsafe. */
3445 /* Expand the jump insns. */
3447 do_jump (arg0
, if_false_label
, if_true_label
);
3448 ret
= gen_sequence ();
3451 /* Now that the __builtin_expect has been validated, go through and add
3452 the expect's to each of the conditional jumps. If we run into an
3453 error, just give up and generate the 'safe' code of doing a SCC
3454 operation and then doing a branch on that. */
3455 for (j
= 0; j
< XVECLEN (ret
, 0); j
++)
3457 rtx insn
= XVECEXP (ret
, 0, j
);
3460 if (GET_CODE (insn
) == JUMP_INSN
&& any_condjump_p (insn
)
3461 && (pattern
= pc_set (insn
)) != NULL_RTX
)
3463 rtx ifelse
= SET_SRC (pattern
);
3467 if (GET_CODE (ifelse
) != IF_THEN_ELSE
)
3470 if (GET_CODE (XEXP (ifelse
, 1)) == LABEL_REF
)
3473 label
= XEXP (XEXP (ifelse
, 1), 0);
3475 /* An inverted jump reverses the probabilities. */
3476 else if (GET_CODE (XEXP (ifelse
, 2)) == LABEL_REF
)
3479 label
= XEXP (XEXP (ifelse
, 2), 0);
3481 /* We shouldn't have to worry about conditional returns during
3482 the expansion stage, but handle it gracefully anyway. */
3483 else if (GET_CODE (XEXP (ifelse
, 1)) == RETURN
)
3488 /* An inverted return reverses the probabilities. */
3489 else if (GET_CODE (XEXP (ifelse
, 2)) == RETURN
)
3497 /* If the test is expected to fail, reverse the
3499 if (integer_zerop (arg1
))
3502 /* If we are jumping to the false label, reverse the
3504 if (label
== NULL_RTX
)
3505 ; /* conditional return */
3506 else if (label
== if_false_label
)
3508 else if (label
!= if_true_label
)
3512 predict_insn_def (insn
, PRED_BUILTIN_EXPECT
, taken
);
3516 /* If no jumps were modified, fail and do __builtin_expect the normal
3525 /* Expand an expression EXP that calls a built-in function,
3526 with result going to TARGET if that's convenient
3527 (and in mode MODE if that's convenient).
3528 SUBTARGET may be used as the target for computing one of EXP's operands.
3529 IGNORE is nonzero if the value is to be ignored. */
3532 expand_builtin (exp
, target
, subtarget
, mode
, ignore
)
3536 enum machine_mode mode
;
3539 tree fndecl
= TREE_OPERAND (TREE_OPERAND (exp
, 0), 0);
3540 tree arglist
= TREE_OPERAND (exp
, 1);
3541 enum built_in_function fcode
= DECL_FUNCTION_CODE (fndecl
);
3543 if (DECL_BUILT_IN_CLASS (fndecl
) == BUILT_IN_MD
)
3544 return (*targetm
.expand_builtin
) (exp
, target
, subtarget
, mode
, ignore
);
3546 /* When not optimizing, generate calls to library functions for a certain
3548 if (!optimize
&& !CALLED_AS_BUILT_IN (fndecl
))
3554 case BUILT_IN_SQRTF
:
3555 case BUILT_IN_SQRTL
:
3556 case BUILT_IN_MEMSET
:
3557 case BUILT_IN_MEMCPY
:
3558 case BUILT_IN_MEMCMP
:
3560 case BUILT_IN_BZERO
:
3561 case BUILT_IN_INDEX
:
3562 case BUILT_IN_RINDEX
:
3563 case BUILT_IN_STRCHR
:
3564 case BUILT_IN_STRRCHR
:
3565 case BUILT_IN_STRLEN
:
3566 case BUILT_IN_STRCPY
:
3567 case BUILT_IN_STRNCPY
:
3568 case BUILT_IN_STRNCMP
:
3569 case BUILT_IN_STRSTR
:
3570 case BUILT_IN_STRPBRK
:
3571 case BUILT_IN_STRCAT
:
3572 case BUILT_IN_STRNCAT
:
3573 case BUILT_IN_STRSPN
:
3574 case BUILT_IN_STRCSPN
:
3575 case BUILT_IN_STRCMP
:
3577 case BUILT_IN_PUTCHAR
:
3579 case BUILT_IN_PRINTF
:
3580 case BUILT_IN_FPUTC
:
3581 case BUILT_IN_FPUTS
:
3582 case BUILT_IN_FWRITE
:
3583 return expand_call (exp
, target
, ignore
);
3593 case BUILT_IN_LLABS
:
3594 case BUILT_IN_IMAXABS
:
3596 case BUILT_IN_FABSF
:
3597 case BUILT_IN_FABSL
:
3598 /* build_function_call changes these into ABS_EXPR. */
3602 case BUILT_IN_CONJF
:
3603 case BUILT_IN_CONJL
:
3604 case BUILT_IN_CREAL
:
3605 case BUILT_IN_CREALF
:
3606 case BUILT_IN_CREALL
:
3607 case BUILT_IN_CIMAG
:
3608 case BUILT_IN_CIMAGF
:
3609 case BUILT_IN_CIMAGL
:
3610 /* expand_tree_builtin changes these into CONJ_EXPR, REALPART_EXPR
3611 and IMAGPART_EXPR. */
3620 /* Treat these like sqrt only if unsafe math optimizations are allowed,
3621 because of possible accuracy problems. */
3622 if (! flag_unsafe_math_optimizations
)
3625 case BUILT_IN_SQRTF
:
3626 case BUILT_IN_SQRTL
:
3627 target
= expand_builtin_mathfn (exp
, target
, subtarget
);
3635 case BUILT_IN_APPLY_ARGS
:
3636 return expand_builtin_apply_args ();
3638 /* __builtin_apply (FUNCTION, ARGUMENTS, ARGSIZE) invokes
3639 FUNCTION with a copy of the parameters described by
3640 ARGUMENTS, and ARGSIZE. It returns a block of memory
3641 allocated on the stack into which is stored all the registers
3642 that might possibly be used for returning the result of a
3643 function. ARGUMENTS is the value returned by
3644 __builtin_apply_args. ARGSIZE is the number of bytes of
3645 arguments that must be copied. ??? How should this value be
3646 computed? We'll also need a safe worst case value for varargs
3648 case BUILT_IN_APPLY
:
3649 if (!validate_arglist (arglist
, POINTER_TYPE
,
3650 POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
)
3651 && !validate_arglist (arglist
, REFERENCE_TYPE
,
3652 POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
3660 for (t
= arglist
, i
= 0; t
; t
= TREE_CHAIN (t
), i
++)
3661 ops
[i
] = expand_expr (TREE_VALUE (t
), NULL_RTX
, VOIDmode
, 0);
3663 return expand_builtin_apply (ops
[0], ops
[1], ops
[2]);
3666 /* __builtin_return (RESULT) causes the function to return the
3667 value described by RESULT. RESULT is address of the block of
3668 memory returned by __builtin_apply. */
3669 case BUILT_IN_RETURN
:
3670 if (validate_arglist (arglist
, POINTER_TYPE
, VOID_TYPE
))
3671 expand_builtin_return (expand_expr (TREE_VALUE (arglist
),
3672 NULL_RTX
, VOIDmode
, 0));
3675 case BUILT_IN_SAVEREGS
:
3676 return expand_builtin_saveregs ();
3678 case BUILT_IN_ARGS_INFO
:
3679 return expand_builtin_args_info (exp
);
3681 /* Return the address of the first anonymous stack arg. */
3682 case BUILT_IN_NEXT_ARG
:
3683 return expand_builtin_next_arg (arglist
);
3685 case BUILT_IN_CLASSIFY_TYPE
:
3686 return expand_builtin_classify_type (arglist
);
3688 case BUILT_IN_CONSTANT_P
:
3689 return expand_builtin_constant_p (exp
);
3691 case BUILT_IN_FRAME_ADDRESS
:
3692 case BUILT_IN_RETURN_ADDRESS
:
3693 return expand_builtin_frame_address (exp
);
3695 /* Returns the address of the area where the structure is returned.
3697 case BUILT_IN_AGGREGATE_INCOMING_ADDRESS
:
3699 || ! AGGREGATE_TYPE_P (TREE_TYPE (TREE_TYPE (current_function_decl
)))
3700 || GET_CODE (DECL_RTL (DECL_RESULT (current_function_decl
))) != MEM
)
3703 return XEXP (DECL_RTL (DECL_RESULT (current_function_decl
)), 0);
3705 case BUILT_IN_ALLOCA
:
3706 target
= expand_builtin_alloca (arglist
, target
);
3712 target
= expand_builtin_ffs (arglist
, target
, subtarget
);
3717 case BUILT_IN_STRLEN
:
3718 target
= expand_builtin_strlen (exp
, target
);
3723 case BUILT_IN_STRCPY
:
3724 target
= expand_builtin_strcpy (exp
, target
, mode
);
3729 case BUILT_IN_STRNCPY
:
3730 target
= expand_builtin_strncpy (arglist
, target
, mode
);
3735 case BUILT_IN_STRCAT
:
3736 target
= expand_builtin_strcat (arglist
, target
, mode
);
3741 case BUILT_IN_STRNCAT
:
3742 target
= expand_builtin_strncat (arglist
, target
, mode
);
3747 case BUILT_IN_STRSPN
:
3748 target
= expand_builtin_strspn (arglist
, target
, mode
);
3753 case BUILT_IN_STRCSPN
:
3754 target
= expand_builtin_strcspn (arglist
, target
, mode
);
3759 case BUILT_IN_STRSTR
:
3760 target
= expand_builtin_strstr (arglist
, target
, mode
);
3765 case BUILT_IN_STRPBRK
:
3766 target
= expand_builtin_strpbrk (arglist
, target
, mode
);
3771 case BUILT_IN_INDEX
:
3772 case BUILT_IN_STRCHR
:
3773 target
= expand_builtin_strchr (arglist
, target
, mode
);
3778 case BUILT_IN_RINDEX
:
3779 case BUILT_IN_STRRCHR
:
3780 target
= expand_builtin_strrchr (arglist
, target
, mode
);
3785 case BUILT_IN_MEMCPY
:
3786 target
= expand_builtin_memcpy (arglist
, target
, mode
);
3791 case BUILT_IN_MEMSET
:
3792 target
= expand_builtin_memset (exp
, target
, mode
);
3797 case BUILT_IN_BZERO
:
3798 target
= expand_builtin_bzero (exp
);
3803 case BUILT_IN_STRCMP
:
3804 target
= expand_builtin_strcmp (exp
, target
, mode
);
3809 case BUILT_IN_STRNCMP
:
3810 target
= expand_builtin_strncmp (exp
, target
, mode
);
3816 case BUILT_IN_MEMCMP
:
3817 target
= expand_builtin_memcmp (exp
, arglist
, target
, mode
);
3822 case BUILT_IN_SETJMP
:
3823 target
= expand_builtin_setjmp (arglist
, target
);
3828 /* __builtin_longjmp is passed a pointer to an array of five words.
3829 It's similar to the C library longjmp function but works with
3830 __builtin_setjmp above. */
3831 case BUILT_IN_LONGJMP
:
3832 if (!validate_arglist (arglist
, POINTER_TYPE
, INTEGER_TYPE
, VOID_TYPE
))
3836 rtx buf_addr
= expand_expr (TREE_VALUE (arglist
), subtarget
,
3838 rtx value
= expand_expr (TREE_VALUE (TREE_CHAIN (arglist
)),
3839 NULL_RTX
, VOIDmode
, 0);
3841 if (value
!= const1_rtx
)
3843 error ("__builtin_longjmp second argument must be 1");
3847 expand_builtin_longjmp (buf_addr
, value
);
3854 emit_insn (gen_trap ());
3857 error ("__builtin_trap not supported by this target");
3861 case BUILT_IN_PUTCHAR
:
3863 case BUILT_IN_FPUTC
:
3864 case BUILT_IN_FWRITE
:
3866 case BUILT_IN_FPUTS
:
3867 target
= expand_builtin_fputs (arglist
, ignore
);
3872 /* Various hooks for the DWARF 2 __throw routine. */
3873 case BUILT_IN_UNWIND_INIT
:
3874 expand_builtin_unwind_init ();
3876 case BUILT_IN_DWARF_CFA
:
3877 return virtual_cfa_rtx
;
3878 #ifdef DWARF2_UNWIND_INFO
3879 case BUILT_IN_DWARF_FP_REGNUM
:
3880 return expand_builtin_dwarf_fp_regnum ();
3881 case BUILT_IN_INIT_DWARF_REG_SIZES
:
3882 expand_builtin_init_dwarf_reg_sizes (TREE_VALUE (arglist
));
3885 case BUILT_IN_FROB_RETURN_ADDR
:
3886 return expand_builtin_frob_return_addr (TREE_VALUE (arglist
));
3887 case BUILT_IN_EXTRACT_RETURN_ADDR
:
3888 return expand_builtin_extract_return_addr (TREE_VALUE (arglist
));
3889 case BUILT_IN_EH_RETURN
:
3890 expand_builtin_eh_return (TREE_VALUE (arglist
),
3891 TREE_VALUE (TREE_CHAIN (arglist
)));
3893 #ifdef EH_RETURN_DATA_REGNO
3894 case BUILT_IN_EH_RETURN_DATA_REGNO
:
3895 return expand_builtin_eh_return_data_regno (arglist
);
3897 case BUILT_IN_VARARGS_START
:
3898 return expand_builtin_va_start (0, arglist
);
3899 case BUILT_IN_STDARG_START
:
3900 return expand_builtin_va_start (1, arglist
);
3901 case BUILT_IN_VA_END
:
3902 return expand_builtin_va_end (arglist
);
3903 case BUILT_IN_VA_COPY
:
3904 return expand_builtin_va_copy (arglist
);
3905 case BUILT_IN_EXPECT
:
3906 return expand_builtin_expect (arglist
, target
);
3907 case BUILT_IN_PREFETCH
:
3908 expand_builtin_prefetch (arglist
);
3912 default: /* just do library call, if unknown builtin */
3913 error ("built-in function `%s' not currently supported",
3914 IDENTIFIER_POINTER (DECL_NAME (fndecl
)));
3917 /* The switch statement above can drop through to cause the function
3918 to be called normally. */
3919 return expand_call (exp
, target
, ignore
);
3922 /* Fold a call to __builtin_constant_p, if we know it will evaluate to a
3923 constant. ARGLIST is the argument list of the call. */
3926 fold_builtin_constant_p (arglist
)
3932 arglist
= TREE_VALUE (arglist
);
3934 /* We return 1 for a numeric type that's known to be a constant
3935 value at compile-time or for an aggregate type that's a
3936 literal constant. */
3937 STRIP_NOPS (arglist
);
3939 /* If we know this is a constant, emit the constant of one. */
3940 if (TREE_CODE_CLASS (TREE_CODE (arglist
)) == 'c'
3941 || (TREE_CODE (arglist
) == CONSTRUCTOR
3942 && TREE_CONSTANT (arglist
))
3943 || (TREE_CODE (arglist
) == ADDR_EXPR
3944 && TREE_CODE (TREE_OPERAND (arglist
, 0)) == STRING_CST
))
3945 return integer_one_node
;
3947 /* If we aren't going to be running CSE or this expression
3948 has side effects, show we don't know it to be a constant.
3949 Likewise if it's a pointer or aggregate type since in those
3950 case we only want literals, since those are only optimized
3951 when generating RTL, not later.
3952 And finally, if we are compiling an initializer, not code, we
3953 need to return a definite result now; there's not going to be any
3954 more optimization done. */
3955 if (TREE_SIDE_EFFECTS (arglist
) || cse_not_expected
3956 || AGGREGATE_TYPE_P (TREE_TYPE (arglist
))
3957 || POINTER_TYPE_P (TREE_TYPE (arglist
))
3959 return integer_zero_node
;
3964 /* Fold a call to __builtin_classify_type. */
3967 fold_builtin_classify_type (arglist
)
3971 return build_int_2 (no_type_class
, 0);
3973 return build_int_2 (type_to_class (TREE_TYPE (TREE_VALUE (arglist
))), 0);
3976 /* Used by constant folding to eliminate some builtin calls early. EXP is
3977 the CALL_EXPR of a call to a builtin function. */
3983 tree fndecl
= TREE_OPERAND (TREE_OPERAND (exp
, 0), 0);
3984 tree arglist
= TREE_OPERAND (exp
, 1);
3985 enum built_in_function fcode
= DECL_FUNCTION_CODE (fndecl
);
3987 if (DECL_BUILT_IN_CLASS (fndecl
) == BUILT_IN_MD
)
3992 case BUILT_IN_CONSTANT_P
:
3993 return fold_builtin_constant_p (arglist
);
3995 case BUILT_IN_CLASSIFY_TYPE
:
3996 return fold_builtin_classify_type (arglist
);
3998 case BUILT_IN_STRLEN
:
3999 if (validate_arglist (arglist
, POINTER_TYPE
, VOID_TYPE
))
4001 tree len
= c_strlen (TREE_VALUE (arglist
));
4015 build_function_call_expr (fn
, arglist
)
4020 call_expr
= build1 (ADDR_EXPR
, build_pointer_type (TREE_TYPE (fn
)), fn
);
4021 call_expr
= build (CALL_EXPR
, TREE_TYPE (TREE_TYPE (fn
)),
4022 call_expr
, arglist
);
4023 TREE_SIDE_EFFECTS (call_expr
) = 1;
4024 return fold (call_expr
);
4027 /* This function validates the types of a function call argument list
4028 represented as a tree chain of parameters against a specified list
4029 of tree_codes. If the last specifier is a 0, that represents an
4030 ellipses, otherwise the last specifier must be a VOID_TYPE. */
4033 validate_arglist
VPARAMS ((tree arglist
, ...))
4035 enum tree_code code
;
4038 VA_OPEN (ap
, arglist
);
4039 VA_FIXEDARG (ap
, tree
, arglist
);
4042 code
= va_arg (ap
, enum tree_code
);
4046 /* This signifies an ellipses, any further arguments are all ok. */
4050 /* This signifies an endlink, if no arguments remain, return
4051 true, otherwise return false. */
4055 /* If no parameters remain or the parameter's code does not
4056 match the specified code, return false. Otherwise continue
4057 checking any remaining arguments. */
4058 if (arglist
== 0 || code
!= TREE_CODE (TREE_TYPE (TREE_VALUE (arglist
))))
4062 arglist
= TREE_CHAIN (arglist
);
4065 /* We need gotos here since we can only have one VA_CLOSE in a
4073 /* Default version of target-specific builtin setup that does nothing. */
4076 default_init_builtins ()
4080 /* Default target-specific builtin expander that does nothing. */
4083 default_expand_builtin (exp
, target
, subtarget
, mode
, ignore
)
4084 tree exp ATTRIBUTE_UNUSED
;
4085 rtx target ATTRIBUTE_UNUSED
;
4086 rtx subtarget ATTRIBUTE_UNUSED
;
4087 enum machine_mode mode ATTRIBUTE_UNUSED
;
4088 int ignore ATTRIBUTE_UNUSED
;