1 /* Expand builtin functions.
2 Copyright (C) 1988, 92-98, 1999, 2000 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
29 #include "hard-reg-set.h"
32 #include "insn-flags.h"
33 #include "insn-codes.h"
34 #include "insn-config.h"
38 #include "typeclass.h"
43 #define CALLED_AS_BUILT_IN(NODE) \
44 (!strncmp (IDENTIFIER_POINTER (DECL_NAME (NODE)), "__builtin_", 10))
46 /* Register mappings for target machines without register windows. */
47 #ifndef INCOMING_REGNO
48 #define INCOMING_REGNO(OUT) (OUT)
50 #ifndef OUTGOING_REGNO
51 #define OUTGOING_REGNO(IN) (IN)
54 #ifndef PAD_VARARGS_DOWN
55 #define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
58 tree (*lang_type_promotes_to) PARAMS ((tree));
60 static int get_pointer_alignment PARAMS ((tree, unsigned));
61 static tree c_strlen PARAMS ((tree));
62 static rtx get_memory_rtx PARAMS ((tree));
63 static int apply_args_size PARAMS ((void));
64 static int apply_result_size PARAMS ((void));
65 #if defined (HAVE_untyped_call) || defined (HAVE_untyped_return)
66 static rtx result_vector PARAMS ((int, rtx));
68 static rtx expand_builtin_apply_args PARAMS ((void));
69 static rtx expand_builtin_apply_args_1 PARAMS ((void));
70 static rtx expand_builtin_apply PARAMS ((rtx, rtx, rtx));
71 static void expand_builtin_return PARAMS ((rtx));
72 static rtx expand_builtin_classify_type PARAMS ((tree));
73 static rtx expand_builtin_mathfn PARAMS ((tree, rtx, rtx));
74 static rtx expand_builtin_constant_p PARAMS ((tree));
75 static rtx expand_builtin_args_info PARAMS ((tree));
76 static rtx expand_builtin_next_arg PARAMS ((tree));
77 static rtx expand_builtin_va_start PARAMS ((int, tree));
78 static rtx expand_builtin_va_end PARAMS ((tree));
79 static rtx expand_builtin_va_copy PARAMS ((tree));
81 static rtx expand_builtin_memcmp PARAMS ((tree, tree, rtx));
82 static rtx expand_builtin_strcmp PARAMS ((tree, rtx));
84 static rtx expand_builtin_memcpy PARAMS ((tree));
85 static rtx expand_builtin_strcpy PARAMS ((tree));
86 static rtx expand_builtin_memset PARAMS ((tree));
87 static rtx expand_builtin_strlen PARAMS ((tree, rtx, enum machine_mode));
88 static rtx expand_builtin_alloca PARAMS ((tree, rtx));
89 static rtx expand_builtin_ffs PARAMS ((tree, rtx, rtx));
90 static rtx expand_builtin_frame_address PARAMS ((tree));
91 static tree stabilize_va_list PARAMS ((tree, int));
93 /* Return the alignment in bits of EXP, a pointer valued expression.
94 But don't return more than MAX_ALIGN no matter what.
95 The alignment returned is, by default, the alignment of the thing that
96 EXP points to (if it is not a POINTER_TYPE, 0 is returned).
98 Otherwise, look at the expression to see if we can do better, i.e., if the
99 expression is actually pointing at an object whose alignment is tighter. */
102 get_pointer_alignment (exp, max_align)
106 unsigned align, inner;
108 if (TREE_CODE (TREE_TYPE (exp)) != POINTER_TYPE)
111 align = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp)));
112 align = MIN (align, max_align);
116 switch (TREE_CODE (exp))
120 case NON_LVALUE_EXPR:
121 exp = TREE_OPERAND (exp, 0);
122 if (TREE_CODE (TREE_TYPE (exp)) != POINTER_TYPE)
124 inner = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp)));
125 align = MIN (inner, max_align);
129 /* If sum of pointer + int, restrict our maximum alignment to that
130 imposed by the integer. If not, we can't do any better than
132 if (TREE_CODE (TREE_OPERAND (exp, 1)) != INTEGER_CST)
135 while (((TREE_INT_CST_LOW (TREE_OPERAND (exp, 1)) * BITS_PER_UNIT)
140 exp = TREE_OPERAND (exp, 0);
144 /* See what we are pointing at and look at its alignment. */
145 exp = TREE_OPERAND (exp, 0);
146 if (TREE_CODE (exp) == FUNCTION_DECL)
147 align = FUNCTION_BOUNDARY;
148 else if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'd')
149 align = DECL_ALIGN (exp);
150 #ifdef CONSTANT_ALIGNMENT
151 else if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'c')
152 align = CONSTANT_ALIGNMENT (exp, align);
154 return MIN (align, max_align);
162 /* Compute the length of a C string. TREE_STRING_LENGTH is not the right
163 way, because it could contain a zero byte in the middle.
164 TREE_STRING_LENGTH is the size of the character array, not the string.
166 Unfortunately, string_constant can't access the values of const char
167 arrays with initializers, so neither can we do so here. */
177 src = string_constant (src, &offset_node);
180 max = TREE_STRING_LENGTH (src);
181 ptr = TREE_STRING_POINTER (src);
182 if (offset_node && TREE_CODE (offset_node) != INTEGER_CST)
184 /* If the string has an internal zero byte (e.g., "foo\0bar"), we can't
185 compute the offset to the following null if we don't know where to
186 start searching for it. */
188 for (i = 0; i < max; i++)
191 /* We don't know the starting offset, but we do know that the string
192 has no internal zero bytes. We can assume that the offset falls
193 within the bounds of the string; otherwise, the programmer deserves
194 what he gets. Subtract the offset from the length of the string,
196 /* This would perhaps not be valid if we were dealing with named
197 arrays in addition to literal string constants. */
198 return size_binop (MINUS_EXPR, size_int (max), offset_node);
201 /* We have a known offset into the string. Start searching there for
203 if (offset_node == 0)
207 /* Did we get a long long offset? If so, punt. */
208 if (TREE_INT_CST_HIGH (offset_node) != 0)
210 offset = TREE_INT_CST_LOW (offset_node);
212 /* If the offset is known to be out of bounds, warn, and call strlen at
214 if (offset < 0 || offset > max)
216 warning ("offset outside bounds of constant string");
219 /* Use strlen to search for the first zero byte. Since any strings
220 constructed with build_string will have nulls appended, we win even
221 if we get handed something like (char[4])"abcd".
223 Since OFFSET is our starting index into the string, no further
224 calculation is needed. */
225 return size_int (strlen (ptr + offset));
228 /* Given TEM, a pointer to a stack frame, follow the dynamic chain COUNT
229 times to get the address of either a higher stack frame, or a return
230 address located within it (depending on FNDECL_CODE). */
232 expand_builtin_return_addr (fndecl_code, count, tem)
233 enum built_in_function fndecl_code;
239 /* Some machines need special handling before we can access
240 arbitrary frames. For example, on the sparc, we must first flush
241 all register windows to the stack. */
242 #ifdef SETUP_FRAME_ADDRESSES
244 SETUP_FRAME_ADDRESSES ();
247 /* On the sparc, the return address is not in the frame, it is in a
248 register. There is no way to access it off of the current frame
249 pointer, but it can be accessed off the previous frame pointer by
250 reading the value from the register window save area. */
251 #ifdef RETURN_ADDR_IN_PREVIOUS_FRAME
252 if (fndecl_code == BUILT_IN_RETURN_ADDRESS)
256 /* Scan back COUNT frames to the specified frame. */
257 for (i = 0; i < count; i++)
259 /* Assume the dynamic chain pointer is in the word that the
260 frame address points to, unless otherwise specified. */
261 #ifdef DYNAMIC_CHAIN_ADDRESS
262 tem = DYNAMIC_CHAIN_ADDRESS (tem);
264 tem = memory_address (Pmode, tem);
265 tem = copy_to_reg (gen_rtx_MEM (Pmode, tem));
268 /* For __builtin_frame_address, return what we've got. */
269 if (fndecl_code == BUILT_IN_FRAME_ADDRESS)
272 /* For __builtin_return_address, Get the return address from that
274 #ifdef RETURN_ADDR_RTX
275 tem = RETURN_ADDR_RTX (count, tem);
277 tem = memory_address (Pmode,
278 plus_constant (tem, GET_MODE_SIZE (Pmode)));
279 tem = gen_rtx_MEM (Pmode, tem);
284 /* __builtin_setjmp is passed a pointer to an array of five words (not
285 all will be used on all machines). It operates similarly to the C
286 library function of the same name, but is more efficient. Much of
287 the code below (and for longjmp) is copied from the handling of
290 NOTE: This is intended for use by GNAT and the exception handling
291 scheme in the compiler and will only work in the method used by
295 expand_builtin_setjmp (buf_addr, target, first_label, next_label)
298 rtx first_label, next_label;
300 rtx lab1 = gen_label_rtx ();
301 enum machine_mode sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL);
302 enum machine_mode value_mode;
305 value_mode = TYPE_MODE (integer_type_node);
307 #ifdef POINTERS_EXTEND_UNSIGNED
308 buf_addr = convert_memory_address (Pmode, buf_addr);
311 buf_addr = force_reg (Pmode, force_operand (buf_addr, NULL_RTX));
313 if (target == 0 || GET_CODE (target) != REG
314 || REGNO (target) < FIRST_PSEUDO_REGISTER)
315 target = gen_reg_rtx (value_mode);
319 /* We store the frame pointer and the address of lab1 in the buffer
320 and use the rest of it for the stack save area, which is
321 machine-dependent. */
323 #ifndef BUILTIN_SETJMP_FRAME_VALUE
324 #define BUILTIN_SETJMP_FRAME_VALUE virtual_stack_vars_rtx
327 emit_move_insn (gen_rtx_MEM (Pmode, buf_addr),
328 BUILTIN_SETJMP_FRAME_VALUE);
329 emit_move_insn (validize_mem
331 plus_constant (buf_addr,
332 GET_MODE_SIZE (Pmode)))),
333 force_reg (Pmode, gen_rtx_LABEL_REF (Pmode, lab1)));
335 stack_save = gen_rtx_MEM (sa_mode,
336 plus_constant (buf_addr,
337 2 * GET_MODE_SIZE (Pmode)));
338 emit_stack_save (SAVE_NONLOCAL, &stack_save, NULL_RTX);
340 /* If there is further processing to do, do it. */
341 #ifdef HAVE_builtin_setjmp_setup
342 if (HAVE_builtin_setjmp_setup)
343 emit_insn (gen_builtin_setjmp_setup (buf_addr));
346 /* Set TARGET to zero and branch to the first-time-through label. */
347 emit_move_insn (target, const0_rtx);
348 emit_jump_insn (gen_jump (first_label));
352 /* Tell flow about the strange goings on. Putting `lab1' on
353 `nonlocal_goto_handler_labels' to indicates that function
354 calls may traverse the arc back to this label. */
356 current_function_has_nonlocal_label = 1;
357 nonlocal_goto_handler_labels =
358 gen_rtx_EXPR_LIST (VOIDmode, lab1, nonlocal_goto_handler_labels);
360 /* Clobber the FP when we get here, so we have to make sure it's
361 marked as used by this function. */
362 emit_insn (gen_rtx_USE (VOIDmode, hard_frame_pointer_rtx));
364 /* Mark the static chain as clobbered here so life information
365 doesn't get messed up for it. */
366 emit_insn (gen_rtx_CLOBBER (VOIDmode, static_chain_rtx));
368 /* Now put in the code to restore the frame pointer, and argument
369 pointer, if needed. The code below is from expand_end_bindings
370 in stmt.c; see detailed documentation there. */
371 #ifdef HAVE_nonlocal_goto
372 if (! HAVE_nonlocal_goto)
374 emit_move_insn (virtual_stack_vars_rtx, hard_frame_pointer_rtx);
376 #if ARG_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM
377 if (fixed_regs[ARG_POINTER_REGNUM])
379 #ifdef ELIMINABLE_REGS
381 static struct elims {int from, to;} elim_regs[] = ELIMINABLE_REGS;
383 for (i = 0; i < sizeof elim_regs / sizeof elim_regs[0]; i++)
384 if (elim_regs[i].from == ARG_POINTER_REGNUM
385 && elim_regs[i].to == HARD_FRAME_POINTER_REGNUM)
388 if (i == sizeof elim_regs / sizeof elim_regs [0])
391 /* Now restore our arg pointer from the address at which it
392 was saved in our stack frame.
393 If there hasn't be space allocated for it yet, make
395 if (arg_pointer_save_area == 0)
396 arg_pointer_save_area
397 = assign_stack_local (Pmode, GET_MODE_SIZE (Pmode), 0);
398 emit_move_insn (virtual_incoming_args_rtx,
399 copy_to_reg (arg_pointer_save_area));
404 #ifdef HAVE_builtin_setjmp_receiver
405 if (HAVE_builtin_setjmp_receiver)
406 emit_insn (gen_builtin_setjmp_receiver (lab1));
409 #ifdef HAVE_nonlocal_goto_receiver
410 if (HAVE_nonlocal_goto_receiver)
411 emit_insn (gen_nonlocal_goto_receiver ());
418 /* Set TARGET, and branch to the next-time-through label. */
419 emit_move_insn (target, const1_rtx);
420 emit_jump_insn (gen_jump (next_label));
426 /* __builtin_longjmp is passed a pointer to an array of five words (not
427 all will be used on all machines). It operates similarly to the C
428 library function of the same name, but is more efficient. Much of
429 the code below is copied from the handling of non-local gotos.
431 NOTE: This is intended for use by GNAT and the exception handling
432 scheme in the compiler and will only work in the method used by
436 expand_builtin_longjmp (buf_addr, value)
440 enum machine_mode sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL);
442 #ifdef POINTERS_EXTEND_UNSIGNED
443 buf_addr = convert_memory_address (Pmode, buf_addr);
445 buf_addr = force_reg (Pmode, buf_addr);
447 /* We used to store value in static_chain_rtx, but that fails if pointers
448 are smaller than integers. We instead require that the user must pass
449 a second argument of 1, because that is what builtin_setjmp will
450 return. This also makes EH slightly more efficient, since we are no
451 longer copying around a value that we don't care about. */
452 if (value != const1_rtx)
455 #ifdef HAVE_builtin_longjmp
456 if (HAVE_builtin_longjmp)
457 emit_insn (gen_builtin_longjmp (buf_addr));
461 fp = gen_rtx_MEM (Pmode, buf_addr);
462 lab = gen_rtx_MEM (Pmode, plus_constant (buf_addr,
463 GET_MODE_SIZE (Pmode)));
465 stack = gen_rtx_MEM (sa_mode, plus_constant (buf_addr,
466 2 * GET_MODE_SIZE (Pmode)));
468 /* Pick up FP, label, and SP from the block and jump. This code is
469 from expand_goto in stmt.c; see there for detailed comments. */
470 #if HAVE_nonlocal_goto
471 if (HAVE_nonlocal_goto)
472 /* We have to pass a value to the nonlocal_goto pattern that will
473 get copied into the static_chain pointer, but it does not matter
474 what that value is, because builtin_setjmp does not use it. */
475 emit_insn (gen_nonlocal_goto (value, fp, stack, lab));
479 lab = copy_to_reg (lab);
481 emit_move_insn (hard_frame_pointer_rtx, fp);
482 emit_stack_restore (SAVE_NONLOCAL, stack, NULL_RTX);
484 emit_insn (gen_rtx_USE (VOIDmode, hard_frame_pointer_rtx));
485 emit_insn (gen_rtx_USE (VOIDmode, stack_pointer_rtx));
486 emit_indirect_jump (lab);
491 /* Get a MEM rtx for expression EXP which can be used in a string instruction
492 (cmpstrsi, movstrsi, ..). */
500 mem = gen_rtx_MEM (BLKmode,
501 memory_address (BLKmode,
502 expand_expr (exp, NULL_RTX,
503 ptr_mode, EXPAND_SUM)));
505 RTX_UNCHANGING_P (mem) = TREE_READONLY (exp);
507 /* Figure out the type of the object pointed to. Set MEM_IN_STRUCT_P
508 if the value is the address of a structure or if the expression is
509 cast to a pointer to structure type. */
512 while (TREE_CODE (exp) == NOP_EXPR)
514 tree cast_type = TREE_TYPE (exp);
515 if (TREE_CODE (cast_type) == POINTER_TYPE
516 && AGGREGATE_TYPE_P (TREE_TYPE (cast_type)))
521 exp = TREE_OPERAND (exp, 0);
524 if (is_aggregate == 0)
528 if (TREE_CODE (exp) == ADDR_EXPR)
529 /* If this is the address of an object, check whether the
530 object is an array. */
531 type = TREE_TYPE (TREE_OPERAND (exp, 0));
533 type = TREE_TYPE (TREE_TYPE (exp));
534 is_aggregate = AGGREGATE_TYPE_P (type);
537 MEM_SET_IN_STRUCT_P (mem, is_aggregate);
541 /* Built-in functions to perform an untyped call and return. */
543 /* For each register that may be used for calling a function, this
544 gives a mode used to copy the register's value. VOIDmode indicates
545 the register is not used for calling a function. If the machine
546 has register windows, this gives only the outbound registers.
547 INCOMING_REGNO gives the corresponding inbound register. */
548 static enum machine_mode apply_args_mode[FIRST_PSEUDO_REGISTER];
550 /* For each register that may be used for returning values, this gives
551 a mode used to copy the register's value. VOIDmode indicates the
552 register is not used for returning values. If the machine has
553 register windows, this gives only the outbound registers.
554 INCOMING_REGNO gives the corresponding inbound register. */
555 static enum machine_mode apply_result_mode[FIRST_PSEUDO_REGISTER];
557 /* For each register that may be used for calling a function, this
558 gives the offset of that register into the block returned by
559 __builtin_apply_args. 0 indicates that the register is not
560 used for calling a function. */
561 static int apply_args_reg_offset[FIRST_PSEUDO_REGISTER];
563 /* Return the offset of register REGNO into the block returned by
564 __builtin_apply_args. This is not declared static, since it is
565 needed in objc-act.c. */
568 apply_args_register_offset (regno)
573 /* Arguments are always put in outgoing registers (in the argument
574 block) if such make sense. */
575 #ifdef OUTGOING_REGNO
576 regno = OUTGOING_REGNO(regno);
578 return apply_args_reg_offset[regno];
581 /* Return the size required for the block returned by __builtin_apply_args,
582 and initialize apply_args_mode. */
587 static int size = -1;
589 enum machine_mode mode;
591 /* The values computed by this function never change. */
594 /* The first value is the incoming arg-pointer. */
595 size = GET_MODE_SIZE (Pmode);
597 /* The second value is the structure value address unless this is
598 passed as an "invisible" first argument. */
599 if (struct_value_rtx)
600 size += GET_MODE_SIZE (Pmode);
602 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
603 if (FUNCTION_ARG_REGNO_P (regno))
605 /* Search for the proper mode for copying this register's
606 value. I'm not sure this is right, but it works so far. */
607 enum machine_mode best_mode = VOIDmode;
609 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
611 mode = GET_MODE_WIDER_MODE (mode))
612 if (HARD_REGNO_MODE_OK (regno, mode)
613 && HARD_REGNO_NREGS (regno, mode) == 1)
616 if (best_mode == VOIDmode)
617 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
619 mode = GET_MODE_WIDER_MODE (mode))
620 if (HARD_REGNO_MODE_OK (regno, mode)
621 && (mov_optab->handlers[(int) mode].insn_code
622 != CODE_FOR_nothing))
626 if (mode == VOIDmode)
629 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
630 if (size % align != 0)
631 size = CEIL (size, align) * align;
632 apply_args_reg_offset[regno] = size;
633 size += GET_MODE_SIZE (mode);
634 apply_args_mode[regno] = mode;
638 apply_args_mode[regno] = VOIDmode;
639 apply_args_reg_offset[regno] = 0;
645 /* Return the size required for the block returned by __builtin_apply,
646 and initialize apply_result_mode. */
651 static int size = -1;
653 enum machine_mode mode;
655 /* The values computed by this function never change. */
660 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
661 if (FUNCTION_VALUE_REGNO_P (regno))
663 /* Search for the proper mode for copying this register's
664 value. I'm not sure this is right, but it works so far. */
665 enum machine_mode best_mode = VOIDmode;
667 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
669 mode = GET_MODE_WIDER_MODE (mode))
670 if (HARD_REGNO_MODE_OK (regno, mode))
673 if (best_mode == VOIDmode)
674 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
676 mode = GET_MODE_WIDER_MODE (mode))
677 if (HARD_REGNO_MODE_OK (regno, mode)
678 && (mov_optab->handlers[(int) mode].insn_code
679 != CODE_FOR_nothing))
683 if (mode == VOIDmode)
686 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
687 if (size % align != 0)
688 size = CEIL (size, align) * align;
689 size += GET_MODE_SIZE (mode);
690 apply_result_mode[regno] = mode;
693 apply_result_mode[regno] = VOIDmode;
695 /* Allow targets that use untyped_call and untyped_return to override
696 the size so that machine-specific information can be stored here. */
697 #ifdef APPLY_RESULT_SIZE
698 size = APPLY_RESULT_SIZE;
704 #if defined (HAVE_untyped_call) || defined (HAVE_untyped_return)
705 /* Create a vector describing the result block RESULT. If SAVEP is true,
706 the result block is used to save the values; otherwise it is used to
707 restore the values. */
710 result_vector (savep, result)
714 int regno, size, align, nelts;
715 enum machine_mode mode;
717 rtx *savevec = (rtx *) alloca (FIRST_PSEUDO_REGISTER * sizeof (rtx));
720 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
721 if ((mode = apply_result_mode[regno]) != VOIDmode)
723 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
724 if (size % align != 0)
725 size = CEIL (size, align) * align;
726 reg = gen_rtx_REG (mode, savep ? regno : INCOMING_REGNO (regno));
727 mem = change_address (result, mode,
728 plus_constant (XEXP (result, 0), size));
729 savevec[nelts++] = (savep
730 ? gen_rtx_SET (VOIDmode, mem, reg)
731 : gen_rtx_SET (VOIDmode, reg, mem));
732 size += GET_MODE_SIZE (mode);
734 return gen_rtx_PARALLEL (VOIDmode, gen_rtvec_v (nelts, savevec));
736 #endif /* HAVE_untyped_call or HAVE_untyped_return */
738 /* Save the state required to perform an untyped call with the same
739 arguments as were passed to the current function. */
742 expand_builtin_apply_args_1 ()
745 int size, align, regno;
746 enum machine_mode mode;
748 /* Create a block where the arg-pointer, structure value address,
749 and argument registers can be saved. */
750 registers = assign_stack_local (BLKmode, apply_args_size (), -1);
752 /* Walk past the arg-pointer and structure value address. */
753 size = GET_MODE_SIZE (Pmode);
754 if (struct_value_rtx)
755 size += GET_MODE_SIZE (Pmode);
757 /* Save each register used in calling a function to the block. */
758 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
759 if ((mode = apply_args_mode[regno]) != VOIDmode)
763 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
764 if (size % align != 0)
765 size = CEIL (size, align) * align;
767 tem = gen_rtx_REG (mode, INCOMING_REGNO (regno));
769 emit_move_insn (change_address (registers, mode,
770 plus_constant (XEXP (registers, 0),
773 size += GET_MODE_SIZE (mode);
776 /* Save the arg pointer to the block. */
777 emit_move_insn (change_address (registers, Pmode, XEXP (registers, 0)),
778 copy_to_reg (virtual_incoming_args_rtx));
779 size = GET_MODE_SIZE (Pmode);
781 /* Save the structure value address unless this is passed as an
782 "invisible" first argument. */
783 if (struct_value_incoming_rtx)
785 emit_move_insn (change_address (registers, Pmode,
786 plus_constant (XEXP (registers, 0),
788 copy_to_reg (struct_value_incoming_rtx));
789 size += GET_MODE_SIZE (Pmode);
792 /* Return the address of the block. */
793 return copy_addr_to_reg (XEXP (registers, 0));
796 /* __builtin_apply_args returns block of memory allocated on
797 the stack into which is stored the arg pointer, structure
798 value address, static chain, and all the registers that might
799 possibly be used in performing a function call. The code is
800 moved to the start of the function so the incoming values are
803 expand_builtin_apply_args ()
805 /* Don't do __builtin_apply_args more than once in a function.
806 Save the result of the first call and reuse it. */
807 if (apply_args_value != 0)
808 return apply_args_value;
810 /* When this function is called, it means that registers must be
811 saved on entry to this function. So we migrate the
812 call to the first insn of this function. */
817 temp = expand_builtin_apply_args_1 ();
821 apply_args_value = temp;
823 /* Put the sequence after the NOTE that starts the function.
824 If this is inside a SEQUENCE, make the outer-level insn
825 chain current, so the code is placed at the start of the
827 push_topmost_sequence ();
828 emit_insns_before (seq, NEXT_INSN (get_insns ()));
829 pop_topmost_sequence ();
834 /* Perform an untyped call and save the state required to perform an
835 untyped return of whatever value was returned by the given function. */
838 expand_builtin_apply (function, arguments, argsize)
839 rtx function, arguments, argsize;
841 int size, align, regno;
842 enum machine_mode mode;
843 rtx incoming_args, result, reg, dest, call_insn;
844 rtx old_stack_level = 0;
847 /* Create a block where the return registers can be saved. */
848 result = assign_stack_local (BLKmode, apply_result_size (), -1);
850 /* ??? The argsize value should be adjusted here. */
852 /* Fetch the arg pointer from the ARGUMENTS block. */
853 incoming_args = gen_reg_rtx (Pmode);
854 emit_move_insn (incoming_args,
855 gen_rtx_MEM (Pmode, arguments));
856 #ifndef STACK_GROWS_DOWNWARD
857 incoming_args = expand_binop (Pmode, sub_optab, incoming_args, argsize,
858 incoming_args, 0, OPTAB_LIB_WIDEN);
861 /* Perform postincrements before actually calling the function. */
864 /* Push a new argument block and copy the arguments. */
865 do_pending_stack_adjust ();
867 /* Save the stack with nonlocal if available */
868 #ifdef HAVE_save_stack_nonlocal
869 if (HAVE_save_stack_nonlocal)
870 emit_stack_save (SAVE_NONLOCAL, &old_stack_level, NULL_RTX);
873 emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX);
875 /* Push a block of memory onto the stack to store the memory arguments.
876 Save the address in a register, and copy the memory arguments. ??? I
877 haven't figured out how the calling convention macros effect this,
878 but it's likely that the source and/or destination addresses in
879 the block copy will need updating in machine specific ways. */
880 dest = allocate_dynamic_stack_space (argsize, 0, 0);
881 emit_block_move (gen_rtx_MEM (BLKmode, dest),
882 gen_rtx_MEM (BLKmode, incoming_args),
884 PARM_BOUNDARY / BITS_PER_UNIT);
886 /* Refer to the argument block. */
888 arguments = gen_rtx_MEM (BLKmode, arguments);
890 /* Walk past the arg-pointer and structure value address. */
891 size = GET_MODE_SIZE (Pmode);
892 if (struct_value_rtx)
893 size += GET_MODE_SIZE (Pmode);
895 /* Restore each of the registers previously saved. Make USE insns
896 for each of these registers for use in making the call. */
897 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
898 if ((mode = apply_args_mode[regno]) != VOIDmode)
900 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
901 if (size % align != 0)
902 size = CEIL (size, align) * align;
903 reg = gen_rtx_REG (mode, regno);
905 change_address (arguments, mode,
906 plus_constant (XEXP (arguments, 0),
909 use_reg (&call_fusage, reg);
910 size += GET_MODE_SIZE (mode);
913 /* Restore the structure value address unless this is passed as an
914 "invisible" first argument. */
915 size = GET_MODE_SIZE (Pmode);
916 if (struct_value_rtx)
918 rtx value = gen_reg_rtx (Pmode);
919 emit_move_insn (value,
920 change_address (arguments, Pmode,
921 plus_constant (XEXP (arguments, 0),
923 emit_move_insn (struct_value_rtx, value);
924 if (GET_CODE (struct_value_rtx) == REG)
925 use_reg (&call_fusage, struct_value_rtx);
926 size += GET_MODE_SIZE (Pmode);
929 /* All arguments and registers used for the call are set up by now! */
930 function = prepare_call_address (function, NULL_TREE, &call_fusage, 0);
932 /* Ensure address is valid. SYMBOL_REF is already valid, so no need,
933 and we don't want to load it into a register as an optimization,
934 because prepare_call_address already did it if it should be done. */
935 if (GET_CODE (function) != SYMBOL_REF)
936 function = memory_address (FUNCTION_MODE, function);
938 /* Generate the actual call instruction and save the return value. */
939 #ifdef HAVE_untyped_call
940 if (HAVE_untyped_call)
941 emit_call_insn (gen_untyped_call (gen_rtx_MEM (FUNCTION_MODE, function),
942 result, result_vector (1, result)));
945 #ifdef HAVE_call_value
950 /* Locate the unique return register. It is not possible to
951 express a call that sets more than one return register using
952 call_value; use untyped_call for that. In fact, untyped_call
953 only needs to save the return registers in the given block. */
954 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
955 if ((mode = apply_result_mode[regno]) != VOIDmode)
958 abort (); /* HAVE_untyped_call required. */
959 valreg = gen_rtx_REG (mode, regno);
962 emit_call_insn (gen_call_value (valreg,
963 gen_rtx_MEM (FUNCTION_MODE, function),
964 const0_rtx, NULL_RTX, const0_rtx));
966 emit_move_insn (change_address (result, GET_MODE (valreg),
974 /* Find the CALL insn we just emitted. */
975 for (call_insn = get_last_insn ();
976 call_insn && GET_CODE (call_insn) != CALL_INSN;
977 call_insn = PREV_INSN (call_insn))
983 /* Put the register usage information on the CALL. If there is already
984 some usage information, put ours at the end. */
985 if (CALL_INSN_FUNCTION_USAGE (call_insn))
989 for (link = CALL_INSN_FUNCTION_USAGE (call_insn); XEXP (link, 1) != 0;
990 link = XEXP (link, 1))
993 XEXP (link, 1) = call_fusage;
996 CALL_INSN_FUNCTION_USAGE (call_insn) = call_fusage;
998 /* Restore the stack. */
999 #ifdef HAVE_save_stack_nonlocal
1000 if (HAVE_save_stack_nonlocal)
1001 emit_stack_restore (SAVE_NONLOCAL, old_stack_level, NULL_RTX);
1004 emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX);
1006 /* Return the address of the result block. */
1007 return copy_addr_to_reg (XEXP (result, 0));
1010 /* Perform an untyped return. */
1013 expand_builtin_return (result)
1016 int size, align, regno;
1017 enum machine_mode mode;
1019 rtx call_fusage = 0;
1021 apply_result_size ();
1022 result = gen_rtx_MEM (BLKmode, result);
1024 #ifdef HAVE_untyped_return
1025 if (HAVE_untyped_return)
1027 emit_jump_insn (gen_untyped_return (result, result_vector (0, result)));
1033 /* Restore the return value and note that each value is used. */
1035 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1036 if ((mode = apply_result_mode[regno]) != VOIDmode)
1038 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
1039 if (size % align != 0)
1040 size = CEIL (size, align) * align;
1041 reg = gen_rtx_REG (mode, INCOMING_REGNO (regno));
1042 emit_move_insn (reg,
1043 change_address (result, mode,
1044 plus_constant (XEXP (result, 0),
1047 push_to_sequence (call_fusage);
1048 emit_insn (gen_rtx_USE (VOIDmode, reg));
1049 call_fusage = get_insns ();
1051 size += GET_MODE_SIZE (mode);
1054 /* Put the USE insns before the return. */
1055 emit_insns (call_fusage);
1057 /* Return whatever values was restored by jumping directly to the end
1059 expand_null_return ();
1062 /* Expand a call to __builtin_classify_type with arguments found in
1065 expand_builtin_classify_type (arglist)
1070 tree type = TREE_TYPE (TREE_VALUE (arglist));
1071 enum tree_code code = TREE_CODE (type);
1072 if (code == VOID_TYPE)
1073 return GEN_INT (void_type_class);
1074 if (code == INTEGER_TYPE)
1075 return GEN_INT (integer_type_class);
1076 if (code == CHAR_TYPE)
1077 return GEN_INT (char_type_class);
1078 if (code == ENUMERAL_TYPE)
1079 return GEN_INT (enumeral_type_class);
1080 if (code == BOOLEAN_TYPE)
1081 return GEN_INT (boolean_type_class);
1082 if (code == POINTER_TYPE)
1083 return GEN_INT (pointer_type_class);
1084 if (code == REFERENCE_TYPE)
1085 return GEN_INT (reference_type_class);
1086 if (code == OFFSET_TYPE)
1087 return GEN_INT (offset_type_class);
1088 if (code == REAL_TYPE)
1089 return GEN_INT (real_type_class);
1090 if (code == COMPLEX_TYPE)
1091 return GEN_INT (complex_type_class);
1092 if (code == FUNCTION_TYPE)
1093 return GEN_INT (function_type_class);
1094 if (code == METHOD_TYPE)
1095 return GEN_INT (method_type_class);
1096 if (code == RECORD_TYPE)
1097 return GEN_INT (record_type_class);
1098 if (code == UNION_TYPE || code == QUAL_UNION_TYPE)
1099 return GEN_INT (union_type_class);
1100 if (code == ARRAY_TYPE)
1102 if (TYPE_STRING_FLAG (type))
1103 return GEN_INT (string_type_class);
1105 return GEN_INT (array_type_class);
1107 if (code == SET_TYPE)
1108 return GEN_INT (set_type_class);
1109 if (code == FILE_TYPE)
1110 return GEN_INT (file_type_class);
1111 if (code == LANG_TYPE)
1112 return GEN_INT (lang_type_class);
1114 return GEN_INT (no_type_class);
1117 /* Expand expression EXP, which is a call to __builtin_constant_p. */
1119 expand_builtin_constant_p (exp)
1122 tree arglist = TREE_OPERAND (exp, 1);
1123 enum machine_mode value_mode = TYPE_MODE (TREE_TYPE (exp));
1129 tree arg = TREE_VALUE (arglist);
1132 /* We return 1 for a numeric type that's known to be a constant
1133 value at compile-time or for an aggregate type that's a
1134 literal constant. */
1137 /* If we know this is a constant, emit the constant of one. */
1138 if (TREE_CODE_CLASS (TREE_CODE (arg)) == 'c'
1139 || (TREE_CODE (arg) == CONSTRUCTOR
1140 && TREE_CONSTANT (arg))
1141 || (TREE_CODE (arg) == ADDR_EXPR
1142 && TREE_CODE (TREE_OPERAND (arg, 0)) == STRING_CST))
1145 /* If we aren't going to be running CSE or this expression
1146 has side effects, show we don't know it to be a constant.
1147 Likewise if it's a pointer or aggregate type since in those
1148 case we only want literals, since those are only optimized
1149 when generating RTL, not later. */
1150 if (TREE_SIDE_EFFECTS (arg) || cse_not_expected
1151 || AGGREGATE_TYPE_P (TREE_TYPE (arg))
1152 || POINTER_TYPE_P (TREE_TYPE (arg)))
1155 /* Otherwise, emit (constant_p_rtx (ARG)) and let CSE get a
1156 chance to see if it can deduce whether ARG is constant. */
1158 tmp = expand_expr (arg, NULL_RTX, VOIDmode, 0);
1159 tmp = gen_rtx_CONSTANT_P_RTX (value_mode, tmp);
1164 /* Expand a call to one of the builtin math functions (sin, cos, or sqrt).
1165 Return 0 if a normal call should be emitted rather than expanding the
1166 function in-line. EXP is the expression that is a call to the builtin
1167 function; if convenient, the result should be placed in TARGET.
1168 SUBTARGET may be used as the target for computing one of EXP's operands. */
1170 expand_builtin_mathfn (exp, target, subtarget)
1172 rtx target, subtarget;
1174 optab builtin_optab;
1176 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
1177 tree arglist = TREE_OPERAND (exp, 1);
1180 /* Arg could be wrong type if user redeclared this fcn wrong. */
1181 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != REAL_TYPE)
1184 /* Stabilize and compute the argument. */
1185 if (TREE_CODE (TREE_VALUE (arglist)) != VAR_DECL
1186 && TREE_CODE (TREE_VALUE (arglist)) != PARM_DECL)
1188 exp = copy_node (exp);
1189 TREE_OPERAND (exp, 1) = arglist;
1190 /* Wrap the computation of the argument in a SAVE_EXPR. That
1191 way, if we need to expand the argument again (as in the
1192 flag_errno_math case below where we cannot directly set
1193 errno), we will not perform side-effects more than once.
1194 Note that here we're mutating the original EXP as well as the
1195 copy; that's the right thing to do in case the original EXP
1196 is expanded later. */
1197 TREE_VALUE (arglist) = save_expr (TREE_VALUE (arglist));
1198 arglist = copy_node (arglist);
1200 op0 = expand_expr (TREE_VALUE (arglist), subtarget, VOIDmode, 0);
1202 /* Make a suitable register to place result in. */
1203 target = gen_reg_rtx (TYPE_MODE (TREE_TYPE (exp)));
1208 switch (DECL_FUNCTION_CODE (fndecl))
1211 builtin_optab = sin_optab; break;
1213 builtin_optab = cos_optab; break;
1214 case BUILT_IN_FSQRT:
1215 builtin_optab = sqrt_optab; break;
1220 /* Compute into TARGET.
1221 Set TARGET to wherever the result comes back. */
1222 target = expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist))),
1223 builtin_optab, op0, target, 0);
1225 /* If we were unable to expand via the builtin, stop the
1226 sequence (without outputting the insns) and return 0, causing
1227 a call to the library function. */
1234 /* Check the results by default. But if flag_fast_math is turned on,
1235 then assume sqrt will always be called with valid arguments. */
1237 if (flag_errno_math && ! flag_fast_math)
1241 /* Don't define the builtin FP instructions
1242 if your machine is not IEEE. */
1243 if (TARGET_FLOAT_FORMAT != IEEE_FLOAT_FORMAT)
1246 lab1 = gen_label_rtx ();
1248 /* Test the result; if it is NaN, set errno=EDOM because
1249 the argument was not in the domain. */
1250 emit_cmp_and_jump_insns (target, target, EQ, 0, GET_MODE (target),
1255 #ifdef GEN_ERRNO_RTX
1256 rtx errno_rtx = GEN_ERRNO_RTX;
1259 = gen_rtx_MEM (word_mode, gen_rtx_SYMBOL_REF (Pmode, "errno"));
1262 emit_move_insn (errno_rtx, GEN_INT (TARGET_EDOM));
1265 /* We can't set errno=EDOM directly; let the library call do it.
1266 Pop the arguments right away in case the call gets deleted. */
1268 expand_call (exp, target, 0);
1275 /* Output the entire sequence. */
1276 insns = get_insns ();
1283 /* Expand expression EXP which is a call to the strlen builtin. Return 0
1284 if we failed the caller should emit a normal call, otherwise
1285 try to get the result in TARGET, if convenient (and in mode MODE if that's
1288 expand_builtin_strlen (exp, target, mode)
1291 enum machine_mode mode;
1293 tree arglist = TREE_OPERAND (exp, 1);
1294 enum machine_mode value_mode = TYPE_MODE (TREE_TYPE (exp));
1297 /* Arg could be non-pointer if user redeclared this fcn wrong. */
1298 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE)
1302 tree src = TREE_VALUE (arglist);
1303 tree len = c_strlen (src);
1306 = get_pointer_alignment (src, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
1308 rtx result, src_rtx, char_rtx;
1309 enum machine_mode insn_mode = value_mode, char_mode;
1310 enum insn_code icode = CODE_FOR_nothing;
1312 /* If the length is known, just return it. */
1314 return expand_expr (len, target, mode, EXPAND_MEMORY_USE_BAD);
1316 /* If SRC is not a pointer type, don't do this operation inline. */
1320 /* Call a function if we can't compute strlen in the right mode. */
1322 while (insn_mode != VOIDmode)
1324 icode = strlen_optab->handlers[(int) insn_mode].insn_code;
1325 if (icode != CODE_FOR_nothing)
1328 insn_mode = GET_MODE_WIDER_MODE (insn_mode);
1330 if (insn_mode == VOIDmode)
1333 /* Make a place to write the result of the instruction. */
1336 && GET_CODE (result) == REG
1337 && GET_MODE (result) == insn_mode
1338 && REGNO (result) >= FIRST_PSEUDO_REGISTER))
1339 result = gen_reg_rtx (insn_mode);
1341 /* Make sure the operands are acceptable to the predicates. */
1343 if (! (*insn_data[(int)icode].operand[0].predicate) (result, insn_mode))
1344 result = gen_reg_rtx (insn_mode);
1345 src_rtx = memory_address (BLKmode,
1346 expand_expr (src, NULL_RTX, ptr_mode,
1349 if (! (*insn_data[(int)icode].operand[1].predicate) (src_rtx, Pmode))
1350 src_rtx = copy_to_mode_reg (Pmode, src_rtx);
1352 /* Check the string is readable and has an end. */
1353 if (current_function_check_memory_usage)
1354 emit_library_call (chkr_check_str_libfunc, 1, VOIDmode, 2,
1356 GEN_INT (MEMORY_USE_RO),
1357 TYPE_MODE (integer_type_node));
1359 char_rtx = const0_rtx;
1360 char_mode = insn_data[(int)icode].operand[2].mode;
1361 if (! (*insn_data[(int)icode].operand[2].predicate) (char_rtx, char_mode))
1362 char_rtx = copy_to_mode_reg (char_mode, char_rtx);
1364 emit_insn (GEN_FCN (icode) (result,
1365 gen_rtx_MEM (BLKmode, src_rtx),
1366 char_rtx, GEN_INT (align)));
1368 /* Return the value in the proper mode for this function. */
1369 if (GET_MODE (result) == value_mode)
1371 else if (target != 0)
1373 convert_move (target, result, 0);
1377 return convert_to_mode (value_mode, result, 0);
1381 /* Expand a call to the memcpy builtin, with arguments in ARGLIST. */
1383 expand_builtin_memcpy (arglist)
1387 /* Arg could be non-pointer if user redeclared this fcn wrong. */
1388 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE
1389 || TREE_CHAIN (arglist) == 0
1390 || (TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist))))
1392 || TREE_CHAIN (TREE_CHAIN (arglist)) == 0
1393 || (TREE_CODE (TREE_TYPE (TREE_VALUE
1394 (TREE_CHAIN (TREE_CHAIN (arglist)))))
1399 tree dest = TREE_VALUE (arglist);
1400 tree src = TREE_VALUE (TREE_CHAIN (arglist));
1401 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
1404 = get_pointer_alignment (src, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
1406 = get_pointer_alignment (dest, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
1407 rtx dest_mem, src_mem, dest_addr, len_rtx;
1409 /* If either SRC or DEST is not a pointer type, don't do
1410 this operation in-line. */
1411 if (src_align == 0 || dest_align == 0)
1414 dest_mem = get_memory_rtx (dest);
1415 src_mem = get_memory_rtx (src);
1416 len_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
1418 /* Just copy the rights of SRC to the rights of DEST. */
1419 if (current_function_check_memory_usage)
1420 emit_library_call (chkr_copy_bitmap_libfunc, 1, VOIDmode, 3,
1421 XEXP (dest_mem, 0), Pmode,
1422 XEXP (src_mem, 0), Pmode,
1423 len_rtx, TYPE_MODE (sizetype));
1425 /* Copy word part most expediently. */
1427 = emit_block_move (dest_mem, src_mem, len_rtx,
1428 MIN (src_align, dest_align));
1431 dest_addr = force_operand (XEXP (dest_mem, 0), NULL_RTX);
1437 /* Expand expression EXP, which is a call to the strcpy builtin. Return 0
1438 if we failed the caller should emit a normal call. */
1440 expand_builtin_strcpy (exp)
1443 tree arglist = TREE_OPERAND (exp, 1);
1447 /* Arg could be non-pointer if user redeclared this fcn wrong. */
1448 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE
1449 || TREE_CHAIN (arglist) == 0
1450 || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist)))) != POINTER_TYPE)
1454 tree len = c_strlen (TREE_VALUE (TREE_CHAIN (arglist)));
1459 len = size_binop (PLUS_EXPR, len, integer_one_node);
1461 chainon (arglist, build_tree_list (NULL_TREE, len));
1463 result = expand_builtin_memcpy (arglist);
1465 TREE_CHAIN (TREE_CHAIN (arglist)) = 0;
1469 /* Expand expression EXP, which is a call to the memset builtin. Return 0
1470 if we failed the caller should emit a normal call. */
1472 expand_builtin_memset (exp)
1475 tree arglist = TREE_OPERAND (exp, 1);
1478 /* Arg could be non-pointer if user redeclared this fcn wrong. */
1479 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE
1480 || TREE_CHAIN (arglist) == 0
1481 || (TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist))))
1483 || TREE_CHAIN (TREE_CHAIN (arglist)) == 0
1485 != (TREE_CODE (TREE_TYPE
1487 (TREE_CHAIN (TREE_CHAIN (arglist))))))))
1491 tree dest = TREE_VALUE (arglist);
1492 tree val = TREE_VALUE (TREE_CHAIN (arglist));
1493 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
1496 = get_pointer_alignment (dest, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
1497 rtx dest_mem, dest_addr, len_rtx;
1499 /* If DEST is not a pointer type, don't do this
1500 operation in-line. */
1501 if (dest_align == 0)
1504 /* If the arguments have side-effects, then we can only evaluate
1505 them at most once. The following code evaluates them twice if
1506 they are not constants because we break out to expand_call
1507 in that case. They can't be constants if they have side-effects
1508 so we can check for that first. Alternatively, we could call
1509 save_expr to make multiple evaluation safe. */
1510 if (TREE_SIDE_EFFECTS (val) || TREE_SIDE_EFFECTS (len))
1513 /* If VAL is not 0, don't do this operation in-line. */
1514 if (expand_expr (val, NULL_RTX, VOIDmode, 0) != const0_rtx)
1517 /* If LEN does not expand to a constant, don't do this
1518 operation in-line. */
1519 len_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
1520 if (GET_CODE (len_rtx) != CONST_INT)
1523 dest_mem = get_memory_rtx (dest);
1525 /* Just check DST is writable and mark it as readable. */
1526 if (current_function_check_memory_usage)
1527 emit_library_call (chkr_check_addr_libfunc, 1, VOIDmode, 3,
1528 XEXP (dest_mem, 0), Pmode,
1529 len_rtx, TYPE_MODE (sizetype),
1530 GEN_INT (MEMORY_USE_WO),
1531 TYPE_MODE (integer_type_node));
1534 dest_addr = clear_storage (dest_mem, len_rtx, dest_align);
1537 dest_addr = force_operand (XEXP (dest_mem, 0), NULL_RTX);
1543 #ifdef HAVE_cmpstrsi
1544 /* Expand expression EXP, which is a call to the memcmp or the strcmp builtin.
1545 ARGLIST is the argument list for this call. Return 0 if we failed and the
1546 caller should emit a normal call, otherwise try to get the result in
1547 TARGET, if convenient. */
1549 expand_builtin_memcmp (exp, arglist, target)
1554 /* If we need to check memory accesses, call the library function. */
1555 if (current_function_check_memory_usage)
1559 /* Arg could be non-pointer if user redeclared this fcn wrong. */
1560 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE
1561 || TREE_CHAIN (arglist) == 0
1562 || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist)))) != POINTER_TYPE
1563 || TREE_CHAIN (TREE_CHAIN (arglist)) == 0
1564 || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist))))) != INTEGER_TYPE)
1566 else if (!HAVE_cmpstrsi)
1570 enum machine_mode mode;
1571 tree arg1 = TREE_VALUE (arglist);
1572 tree arg2 = TREE_VALUE (TREE_CHAIN (arglist));
1573 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
1577 = get_pointer_alignment (arg1, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
1579 = get_pointer_alignment (arg2, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
1580 enum machine_mode insn_mode
1581 = insn_data[(int) CODE_FOR_cmpstrsi].operand[0].mode;
1583 /* If we don't have POINTER_TYPE, call the function. */
1584 if (arg1_align == 0 || arg2_align == 0)
1587 /* Make a place to write the result of the instruction. */
1590 && GET_CODE (result) == REG && GET_MODE (result) == insn_mode
1591 && REGNO (result) >= FIRST_PSEUDO_REGISTER))
1592 result = gen_reg_rtx (insn_mode);
1594 emit_insn (gen_cmpstrsi (result, get_memory_rtx (arg1),
1595 get_memory_rtx (arg2),
1596 expand_expr (len, NULL_RTX, VOIDmode, 0),
1597 GEN_INT (MIN (arg1_align, arg2_align))));
1599 /* Return the value in the proper mode for this function. */
1600 mode = TYPE_MODE (TREE_TYPE (exp));
1601 if (GET_MODE (result) == mode)
1603 else if (target != 0)
1605 convert_move (target, result, 0);
1609 return convert_to_mode (mode, result, 0);
1613 /* Expand expression EXP, which is a call to the strcmp builtin. Return 0
1614 if we failed the caller should emit a normal call, otherwise try to get
1615 the result in TARGET, if convenient. */
1617 expand_builtin_strcmp (exp, target)
1621 tree arglist = TREE_OPERAND (exp, 1);
1623 /* If we need to check memory accesses, call the library function. */
1624 if (current_function_check_memory_usage)
1628 /* Arg could be non-pointer if user redeclared this fcn wrong. */
1629 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE
1630 || TREE_CHAIN (arglist) == 0
1631 || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist)))) != POINTER_TYPE)
1633 else if (!HAVE_cmpstrsi)
1636 tree arg1 = TREE_VALUE (arglist);
1637 tree arg2 = TREE_VALUE (TREE_CHAIN (arglist));
1640 len = c_strlen (arg1);
1642 len = size_binop (PLUS_EXPR, integer_one_node, len);
1643 len2 = c_strlen (arg2);
1645 len2 = size_binop (PLUS_EXPR, integer_one_node, len2);
1647 /* If we don't have a constant length for the first, use the length
1648 of the second, if we know it. We don't require a constant for
1649 this case; some cost analysis could be done if both are available
1650 but neither is constant. For now, assume they're equally cheap.
1652 If both strings have constant lengths, use the smaller. This
1653 could arise if optimization results in strcpy being called with
1654 two fixed strings, or if the code was machine-generated. We should
1655 add some code to the `memcmp' handler below to deal with such
1656 situations, someday. */
1657 if (!len || TREE_CODE (len) != INTEGER_CST)
1664 else if (len2 && TREE_CODE (len2) == INTEGER_CST)
1666 if (tree_int_cst_lt (len2, len))
1670 chainon (arglist, build_tree_list (NULL_TREE, len));
1671 result = expand_builtin_memcmp (exp, arglist, target);
1673 TREE_CHAIN (TREE_CHAIN (arglist)) = 0;
1679 /* Expand a call to __builtin_saveregs, generating the result in TARGET,
1680 if that's convenient. */
1682 expand_builtin_saveregs ()
1686 /* Don't do __builtin_saveregs more than once in a function.
1687 Save the result of the first call and reuse it. */
1688 if (saveregs_value != 0)
1689 return saveregs_value;
1691 /* When this function is called, it means that registers must be
1692 saved on entry to this function. So we migrate the call to the
1693 first insn of this function. */
1697 #ifdef EXPAND_BUILTIN_SAVEREGS
1698 /* Do whatever the machine needs done in this case. */
1699 val = EXPAND_BUILTIN_SAVEREGS ();
1701 /* ??? We used to try and build up a call to the out of line function,
1702 guessing about what registers needed saving etc. This became much
1703 harder with __builtin_va_start, since we don't have a tree for a
1704 call to __builtin_saveregs to fall back on. There was exactly one
1705 port (i860) that used this code, and I'm unconvinced it could actually
1706 handle the general case. So we no longer try to handle anything
1707 weird and make the backend absorb the evil. */
1709 error ("__builtin_saveregs not supported by this target");
1716 saveregs_value = val;
1718 /* Put the sequence after the NOTE that starts the function. If this
1719 is inside a SEQUENCE, make the outer-level insn chain current, so
1720 the code is placed at the start of the function. */
1721 push_topmost_sequence ();
1722 emit_insns_after (seq, get_insns ());
1723 pop_topmost_sequence ();
1728 /* __builtin_args_info (N) returns word N of the arg space info
1729 for the current function. The number and meanings of words
1730 is controlled by the definition of CUMULATIVE_ARGS. */
1732 expand_builtin_args_info (exp)
1735 tree arglist = TREE_OPERAND (exp, 1);
1736 int nwords = sizeof (CUMULATIVE_ARGS) / sizeof (int);
1737 int *word_ptr = (int *) ¤t_function_args_info;
1739 /* These are used by the code below that is if 0'ed away */
1741 tree type, elts, result;
1744 if (sizeof (CUMULATIVE_ARGS) % sizeof (int) != 0)
1749 tree arg = TREE_VALUE (arglist);
1750 if (TREE_CODE (arg) != INTEGER_CST)
1751 error ("argument of `__builtin_args_info' must be constant");
1754 int wordnum = TREE_INT_CST_LOW (arg);
1756 if (wordnum < 0 || wordnum >= nwords || TREE_INT_CST_HIGH (arg))
1757 error ("argument of `__builtin_args_info' out of range");
1759 return GEN_INT (word_ptr[wordnum]);
1763 error ("missing argument in `__builtin_args_info'");
1768 for (i = 0; i < nwords; i++)
1769 elts = tree_cons (NULL_TREE, build_int_2 (word_ptr[i], 0));
1771 type = build_array_type (integer_type_node,
1772 build_index_type (build_int_2 (nwords, 0)));
1773 result = build (CONSTRUCTOR, type, NULL_TREE, nreverse (elts));
1774 TREE_CONSTANT (result) = 1;
1775 TREE_STATIC (result) = 1;
1776 result = build1 (INDIRECT_REF, build_pointer_type (type), result);
1777 TREE_CONSTANT (result) = 1;
1778 return expand_expr (result, NULL_RTX, VOIDmode, EXPAND_MEMORY_USE_BAD);
1782 /* Expand ARGLIST, from a call to __builtin_next_arg. */
1784 expand_builtin_next_arg (arglist)
1787 tree fntype = TREE_TYPE (current_function_decl);
1789 if ((TYPE_ARG_TYPES (fntype) == 0
1790 || (TREE_VALUE (tree_last (TYPE_ARG_TYPES (fntype)))
1792 && ! current_function_varargs)
1794 error ("`va_start' used in function with fixed args");
1800 tree last_parm = tree_last (DECL_ARGUMENTS (current_function_decl));
1801 tree arg = TREE_VALUE (arglist);
1803 /* Strip off all nops for the sake of the comparison. This
1804 is not quite the same as STRIP_NOPS. It does more.
1805 We must also strip off INDIRECT_EXPR for C++ reference
1807 while (TREE_CODE (arg) == NOP_EXPR
1808 || TREE_CODE (arg) == CONVERT_EXPR
1809 || TREE_CODE (arg) == NON_LVALUE_EXPR
1810 || TREE_CODE (arg) == INDIRECT_REF)
1811 arg = TREE_OPERAND (arg, 0);
1812 if (arg != last_parm)
1813 warning ("second parameter of `va_start' not last named argument");
1815 else if (! current_function_varargs)
1816 /* Evidently an out of date version of <stdarg.h>; can't validate
1817 va_start's second argument, but can still work as intended. */
1818 warning ("`__builtin_next_arg' called without an argument");
1820 return expand_binop (Pmode, add_optab,
1821 current_function_internal_arg_pointer,
1822 current_function_arg_offset_rtx,
1823 NULL_RTX, 0, OPTAB_LIB_WIDEN);
1826 /* Make it easier for the backends by protecting the valist argument
1827 from multiple evaluations. */
1830 stabilize_va_list (valist, was_ptr)
1834 if (TREE_CODE (va_list_type_node) == ARRAY_TYPE)
1836 /* If stdarg.h took the address of an array-type valist that was passed
1837 as a parameter, we'll have taken the address of the parameter itself
1838 rather than the array as we'd intended. Undo this mistake. */
1842 STRIP_NOPS (valist);
1844 /* Two cases: either &array, which decomposed to
1845 <ptr <array <record> valist>>
1846 or &ptr, which turned into
1847 <ptr <ptr <record>>>
1848 In the first case we'll need to put the ADDR_EXPR back
1849 after frobbing the types as if &array[0]. */
1851 if (TREE_CODE (valist) != ADDR_EXPR)
1853 valist = TREE_OPERAND (valist, 0);
1856 if (TYPE_MAIN_VARIANT (TREE_TYPE (valist))
1857 == TYPE_MAIN_VARIANT (va_list_type_node))
1859 tree pt = build_pointer_type (TREE_TYPE (va_list_type_node));
1860 valist = build1 (ADDR_EXPR, pt, valist);
1861 TREE_SIDE_EFFECTS (valist)
1862 = TREE_SIDE_EFFECTS (TREE_OPERAND (valist, 0));
1866 if (! POINTER_TYPE_P (TREE_TYPE (valist))
1867 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (valist)))
1868 != TYPE_MAIN_VARIANT (TREE_TYPE (va_list_type_node))))
1872 if (TREE_SIDE_EFFECTS (valist))
1873 valist = save_expr (valist);
1881 if (! TREE_SIDE_EFFECTS (valist))
1884 pt = build_pointer_type (va_list_type_node);
1885 valist = fold (build1 (ADDR_EXPR, pt, valist));
1886 TREE_SIDE_EFFECTS (valist) = 1;
1888 if (TREE_SIDE_EFFECTS (valist))
1889 valist = save_expr (valist);
1890 valist = fold (build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (valist)),
1897 /* The "standard" implementation of va_start: just assign `nextarg' to
1900 std_expand_builtin_va_start (stdarg_p, valist, nextarg)
1901 int stdarg_p ATTRIBUTE_UNUSED;
1908 nextarg = plus_constant (nextarg, -UNITS_PER_WORD);
1910 t = build (MODIFY_EXPR, TREE_TYPE (valist), valist,
1911 make_tree (ptr_type_node, nextarg));
1912 TREE_SIDE_EFFECTS (t) = 1;
1914 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
1917 /* Expand ARGLIST, which from a call to __builtin_stdarg_va_start or
1918 __builtin_varargs_va_start, depending on STDARG_P. */
1920 expand_builtin_va_start (stdarg_p, arglist)
1925 tree chain = arglist, valist;
1928 nextarg = expand_builtin_next_arg (chain = TREE_CHAIN (arglist));
1930 nextarg = expand_builtin_next_arg (NULL_TREE);
1932 if (TREE_CHAIN (chain))
1933 error ("too many arguments to function `va_start'");
1935 valist = stabilize_va_list (TREE_VALUE (arglist), 1);
1937 #ifdef EXPAND_BUILTIN_VA_START
1938 EXPAND_BUILTIN_VA_START (stdarg_p, valist, nextarg);
1940 std_expand_builtin_va_start (stdarg_p, valist, nextarg);
1946 /* Allocate an alias set for use in storing and reading from the varargs
1949 get_varargs_alias_set ()
1951 static int set = -1;
1953 set = new_alias_set ();
1957 /* The "standard" implementation of va_arg: read the value from the
1958 current (padded) address and increment by the (padded) size. */
1960 std_expand_builtin_va_arg (valist, type)
1964 HOST_WIDE_INT align;
1965 HOST_WIDE_INT rounded_size;
1968 /* Compute the rounded size of the type. */
1969 align = PARM_BOUNDARY / BITS_PER_UNIT;
1970 rounded_size = (((int_size_in_bytes (type) + align - 1) / align) * align);
1974 if (PAD_VARARGS_DOWN)
1976 /* Small args are padded downward. */
1979 adj = TREE_INT_CST_LOW (TYPE_SIZE (type)) / BITS_PER_UNIT;
1980 if (rounded_size > align)
1983 addr_tree = build (PLUS_EXPR, TREE_TYPE (addr_tree), addr_tree,
1984 build_int_2 (rounded_size - adj, 0));
1987 addr = expand_expr (addr_tree, NULL_RTX, Pmode, EXPAND_NORMAL);
1988 addr = copy_to_reg (addr);
1990 /* Compute new value for AP. */
1991 t = build (MODIFY_EXPR, TREE_TYPE (valist), valist,
1992 build (PLUS_EXPR, TREE_TYPE (valist), valist,
1993 build_int_2 (rounded_size, 0)));
1994 TREE_SIDE_EFFECTS (t) = 1;
1995 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
2000 /* Expand __builtin_va_arg, which is not really a builtin function, but
2001 a very special sort of operator. */
2003 expand_builtin_va_arg (valist, type)
2007 tree promoted_type, want_va_type, have_va_type;
2009 /* Verify that valist is of the proper type. */
2011 want_va_type = va_list_type_node;
2012 have_va_type = TREE_TYPE (valist);
2013 if (TREE_CODE (want_va_type) == ARRAY_TYPE)
2015 /* If va_list is an array type, the argument may have decayed
2016 to a pointer type, e.g. by being passed to another function.
2017 In that case, unwrap both types so that we can compare the
2018 underlying records. */
2019 if (TREE_CODE (have_va_type) == ARRAY_TYPE
2020 || TREE_CODE (have_va_type) == POINTER_TYPE)
2022 want_va_type = TREE_TYPE (want_va_type);
2023 have_va_type = TREE_TYPE (have_va_type);
2026 if (TYPE_MAIN_VARIANT (want_va_type) != TYPE_MAIN_VARIANT (have_va_type))
2028 error ("first argument to `va_arg' not of type `va_list'");
2032 /* Generate a diagnostic for requesting data of a type that cannot
2033 be passed through `...' due to type promotion at the call site. */
2034 else if ((promoted_type = (*lang_type_promotes_to) (type)) != NULL_TREE)
2036 const char *name = "<anonymous type>", *pname = 0;
2037 static int gave_help;
2039 if (TYPE_NAME (type))
2041 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
2042 name = IDENTIFIER_POINTER (TYPE_NAME (type));
2043 else if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
2044 && DECL_NAME (TYPE_NAME (type)))
2045 name = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type)));
2047 if (TYPE_NAME (promoted_type))
2049 if (TREE_CODE (TYPE_NAME (promoted_type)) == IDENTIFIER_NODE)
2050 pname = IDENTIFIER_POINTER (TYPE_NAME (promoted_type));
2051 else if (TREE_CODE (TYPE_NAME (promoted_type)) == TYPE_DECL
2052 && DECL_NAME (TYPE_NAME (promoted_type)))
2053 pname = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (promoted_type)));
2056 error ("`%s' is promoted to `%s' when passed through `...'", name, pname);
2060 error ("(so you should pass `%s' not `%s' to `va_arg')", pname, name);
2067 /* Make it easier for the backends by protecting the valist argument
2068 from multiple evaluations. */
2069 valist = stabilize_va_list (valist, 0);
2071 #ifdef EXPAND_BUILTIN_VA_ARG
2072 addr = EXPAND_BUILTIN_VA_ARG (valist, type);
2074 addr = std_expand_builtin_va_arg (valist, type);
2078 result = gen_rtx_MEM (TYPE_MODE (type), addr);
2079 MEM_ALIAS_SET (result) = get_varargs_alias_set ();
2084 /* Expand ARGLIST, from a call to __builtin_va_end. */
2086 expand_builtin_va_end (arglist)
2089 tree valist = TREE_VALUE (arglist);
2091 #ifdef EXPAND_BUILTIN_VA_END
2092 valist = stabilize_va_list (valist, 0);
2093 EXPAND_BUILTIN_VA_END(arglist);
2095 /* Evaluate for side effects, if needed. I hate macros that don't
2097 if (TREE_SIDE_EFFECTS (valist))
2098 expand_expr (valist, const0_rtx, VOIDmode, EXPAND_NORMAL);
2104 /* Expand ARGLIST, from a call to __builtin_va_copy. We do this as a
2105 builtin rather than just as an assignment in stdarg.h because of the
2106 nastiness of array-type va_list types. */
2108 expand_builtin_va_copy (arglist)
2113 dst = TREE_VALUE (arglist);
2114 src = TREE_VALUE (TREE_CHAIN (arglist));
2116 dst = stabilize_va_list (dst, 1);
2117 src = stabilize_va_list (src, 0);
2119 if (TREE_CODE (va_list_type_node) != ARRAY_TYPE)
2121 t = build (MODIFY_EXPR, va_list_type_node, dst, src);
2122 TREE_SIDE_EFFECTS (t) = 1;
2123 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
2127 rtx dstb, srcb, size;
2129 /* Evaluate to pointers. */
2130 dstb = expand_expr (dst, NULL_RTX, Pmode, EXPAND_NORMAL);
2131 srcb = expand_expr (src, NULL_RTX, Pmode, EXPAND_NORMAL);
2132 size = expand_expr (TYPE_SIZE_UNIT (va_list_type_node), NULL_RTX,
2133 VOIDmode, EXPAND_NORMAL);
2135 /* "Dereference" to BLKmode memories. */
2136 dstb = gen_rtx_MEM (BLKmode, dstb);
2137 MEM_ALIAS_SET (dstb) = get_alias_set (TREE_TYPE (TREE_TYPE (dst)));
2138 srcb = gen_rtx_MEM (BLKmode, srcb);
2139 MEM_ALIAS_SET (srcb) = get_alias_set (TREE_TYPE (TREE_TYPE (src)));
2142 emit_block_move (dstb, srcb, size,
2143 TYPE_ALIGN (va_list_type_node) / BITS_PER_UNIT);
2149 /* Expand a call to one of the builtin functions __builtin_frame_address or
2150 __builtin_return_address. */
2152 expand_builtin_frame_address (exp)
2155 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
2156 tree arglist = TREE_OPERAND (exp, 1);
2158 /* The argument must be a nonnegative integer constant.
2159 It counts the number of frames to scan up the stack.
2160 The value is the return address saved in that frame. */
2162 /* Warning about missing arg was already issued. */
2164 else if (TREE_CODE (TREE_VALUE (arglist)) != INTEGER_CST
2165 || tree_int_cst_sgn (TREE_VALUE (arglist)) < 0)
2167 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
2168 error ("invalid arg to `__builtin_frame_address'");
2170 error ("invalid arg to `__builtin_return_address'");
2175 rtx tem = expand_builtin_return_addr (DECL_FUNCTION_CODE (fndecl),
2176 TREE_INT_CST_LOW (TREE_VALUE (arglist)),
2177 hard_frame_pointer_rtx);
2179 /* Some ports cannot access arbitrary stack frames. */
2182 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
2183 warning ("unsupported arg to `__builtin_frame_address'");
2185 warning ("unsupported arg to `__builtin_return_address'");
2189 /* For __builtin_frame_address, return what we've got. */
2190 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
2193 if (GET_CODE (tem) != REG
2194 && ! CONSTANT_P (tem))
2195 tem = copy_to_mode_reg (Pmode, tem);
2200 /* Expand a call to the alloca builtin, with arguments ARGLIST. Return 0 if
2201 we failed and the caller should emit a normal call, otherwise try to get
2202 the result in TARGET, if convenient. */
2204 expand_builtin_alloca (arglist, target)
2211 /* Arg could be non-integer if user redeclared this fcn wrong. */
2212 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != INTEGER_TYPE)
2215 /* Compute the argument. */
2216 op0 = expand_expr (TREE_VALUE (arglist), NULL_RTX, VOIDmode, 0);
2218 /* Allocate the desired space. */
2219 return allocate_dynamic_stack_space (op0, target, BITS_PER_UNIT);
2222 /* Expand a call to the ffs builtin. The arguments are in ARGLIST.
2223 Return 0 if a normal call should be emitted rather than expanding the
2224 function in-line. If convenient, the result should be placed in TARGET.
2225 SUBTARGET may be used as the target for computing one of EXP's operands. */
2227 expand_builtin_ffs (arglist, target, subtarget)
2229 rtx target, subtarget;
2233 /* Arg could be non-integer if user redeclared this fcn wrong. */
2234 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != INTEGER_TYPE)
2237 /* Compute the argument. */
2238 op0 = expand_expr (TREE_VALUE (arglist), subtarget, VOIDmode, 0);
2239 /* Compute ffs, into TARGET if possible.
2240 Set TARGET to wherever the result comes back. */
2241 target = expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist))),
2242 ffs_optab, op0, target, 1);
2248 /* Expand an expression EXP that calls a built-in function,
2249 with result going to TARGET if that's convenient
2250 (and in mode MODE if that's convenient).
2251 SUBTARGET may be used as the target for computing one of EXP's operands.
2252 IGNORE is nonzero if the value is to be ignored. */
2255 expand_builtin (exp, target, subtarget, mode, ignore)
2259 enum machine_mode mode;
2262 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
2263 tree arglist = TREE_OPERAND (exp, 1);
2264 enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
2266 #ifdef MD_EXPAND_BUILTIN
2267 if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_MD)
2268 return MD_EXPAND_BUILTIN (exp, target, subtarget, mode, ignore);
2271 /* When not optimizing, generate calls to library functions for a certain
2273 if (! optimize && ! CALLED_AS_BUILT_IN (fndecl)
2274 && (fcode == BUILT_IN_SIN || fcode == BUILT_IN_COS
2275 || fcode == BUILT_IN_FSQRT || fcode == BUILT_IN_MEMSET
2276 || fcode == BUILT_IN_MEMCPY || fcode == BUILT_IN_MEMCMP
2277 || fcode == BUILT_IN_STRLEN || fcode == BUILT_IN_STRCPY
2278 || fcode == BUILT_IN_STRCMP || fcode == BUILT_IN_FFS))
2279 return expand_call (exp, target, ignore);
2286 /* build_function_call changes these into ABS_EXPR. */
2291 /* Treat these like sqrt, but only if the user asks for them. */
2292 if (! flag_fast_math)
2294 case BUILT_IN_FSQRT:
2295 target = expand_builtin_mathfn (exp, target, subtarget);
2303 case BUILT_IN_APPLY_ARGS:
2304 return expand_builtin_apply_args ();
2306 /* __builtin_apply (FUNCTION, ARGUMENTS, ARGSIZE) invokes
2307 FUNCTION with a copy of the parameters described by
2308 ARGUMENTS, and ARGSIZE. It returns a block of memory
2309 allocated on the stack into which is stored all the registers
2310 that might possibly be used for returning the result of a
2311 function. ARGUMENTS is the value returned by
2312 __builtin_apply_args. ARGSIZE is the number of bytes of
2313 arguments that must be copied. ??? How should this value be
2314 computed? We'll also need a safe worst case value for varargs
2316 case BUILT_IN_APPLY:
2318 /* Arg could be non-pointer if user redeclared this fcn wrong. */
2319 || ! POINTER_TYPE_P (TREE_TYPE (TREE_VALUE (arglist)))
2320 || TREE_CHAIN (arglist) == 0
2321 || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist)))) != POINTER_TYPE
2322 || TREE_CHAIN (TREE_CHAIN (arglist)) == 0
2323 || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist))))) != INTEGER_TYPE)
2331 for (t = arglist, i = 0; t; t = TREE_CHAIN (t), i++)
2332 ops[i] = expand_expr (TREE_VALUE (t), NULL_RTX, VOIDmode, 0);
2334 return expand_builtin_apply (ops[0], ops[1], ops[2]);
2337 /* __builtin_return (RESULT) causes the function to return the
2338 value described by RESULT. RESULT is address of the block of
2339 memory returned by __builtin_apply. */
2340 case BUILT_IN_RETURN:
2342 /* Arg could be non-pointer if user redeclared this fcn wrong. */
2343 && TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) == POINTER_TYPE)
2344 expand_builtin_return (expand_expr (TREE_VALUE (arglist),
2345 NULL_RTX, VOIDmode, 0));
2348 case BUILT_IN_SAVEREGS:
2349 return expand_builtin_saveregs ();
2351 case BUILT_IN_ARGS_INFO:
2352 return expand_builtin_args_info (exp);
2354 /* Return the address of the first anonymous stack arg. */
2355 case BUILT_IN_NEXT_ARG:
2356 return expand_builtin_next_arg (arglist);
2358 case BUILT_IN_CLASSIFY_TYPE:
2359 return expand_builtin_classify_type (arglist);
2361 case BUILT_IN_CONSTANT_P:
2362 return expand_builtin_constant_p (exp);
2364 case BUILT_IN_FRAME_ADDRESS:
2365 case BUILT_IN_RETURN_ADDRESS:
2366 return expand_builtin_frame_address (exp);
2368 /* Returns the address of the area where the structure is returned.
2370 case BUILT_IN_AGGREGATE_INCOMING_ADDRESS:
2372 || ! AGGREGATE_TYPE_P (TREE_TYPE (TREE_TYPE (current_function_decl)))
2373 || GET_CODE (DECL_RTL (DECL_RESULT (current_function_decl))) != MEM)
2376 return XEXP (DECL_RTL (DECL_RESULT (current_function_decl)), 0);
2378 case BUILT_IN_ALLOCA:
2379 target = expand_builtin_alloca (arglist, target);
2385 target = expand_builtin_ffs (arglist, target, subtarget);
2390 case BUILT_IN_STRLEN:
2391 target = expand_builtin_strlen (exp, target, mode);
2396 case BUILT_IN_STRCPY:
2397 target = expand_builtin_strcpy (exp);
2402 case BUILT_IN_MEMCPY:
2403 target = expand_builtin_memcpy (arglist);
2408 case BUILT_IN_MEMSET:
2409 target = expand_builtin_memset (exp);
2414 /* These comparison functions need an instruction that returns an actual
2415 index. An ordinary compare that just sets the condition codes
2417 #ifdef HAVE_cmpstrsi
2418 case BUILT_IN_STRCMP:
2419 target = expand_builtin_strcmp (exp, target);
2424 case BUILT_IN_MEMCMP:
2425 target = expand_builtin_memcmp (exp, arglist, target);
2430 case BUILT_IN_STRCMP:
2431 case BUILT_IN_MEMCMP:
2435 case BUILT_IN_SETJMP:
2437 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE)
2441 rtx buf_addr = expand_expr (TREE_VALUE (arglist), subtarget,
2443 rtx lab = gen_label_rtx ();
2444 rtx ret = expand_builtin_setjmp (buf_addr, target, lab, lab);
2449 /* __builtin_longjmp is passed a pointer to an array of five words.
2450 It's similar to the C library longjmp function but works with
2451 __builtin_setjmp above. */
2452 case BUILT_IN_LONGJMP:
2453 if (arglist == 0 || TREE_CHAIN (arglist) == 0
2454 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE)
2458 rtx buf_addr = expand_expr (TREE_VALUE (arglist), subtarget,
2460 rtx value = expand_expr (TREE_VALUE (TREE_CHAIN (arglist)),
2461 NULL_RTX, VOIDmode, 0);
2463 if (value != const1_rtx)
2465 error ("__builtin_longjmp second argument must be 1");
2469 expand_builtin_longjmp (buf_addr, value);
2476 emit_insn (gen_trap ());
2479 error ("__builtin_trap not supported by this target");
2483 /* Various hooks for the DWARF 2 __throw routine. */
2484 case BUILT_IN_UNWIND_INIT:
2485 expand_builtin_unwind_init ();
2487 case BUILT_IN_DWARF_CFA:
2488 return virtual_cfa_rtx;
2489 #ifdef DWARF2_UNWIND_INFO
2490 case BUILT_IN_DWARF_FP_REGNUM:
2491 return expand_builtin_dwarf_fp_regnum ();
2492 case BUILT_IN_INIT_DWARF_REG_SIZES:
2493 expand_builtin_init_dwarf_reg_sizes (TREE_VALUE (arglist));
2496 case BUILT_IN_FROB_RETURN_ADDR:
2497 return expand_builtin_frob_return_addr (TREE_VALUE (arglist));
2498 case BUILT_IN_EXTRACT_RETURN_ADDR:
2499 return expand_builtin_extract_return_addr (TREE_VALUE (arglist));
2500 case BUILT_IN_EH_RETURN:
2501 expand_builtin_eh_return (TREE_VALUE (arglist),
2502 TREE_VALUE (TREE_CHAIN (arglist)),
2503 TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist))));
2505 case BUILT_IN_VARARGS_START:
2506 return expand_builtin_va_start (0, arglist);
2507 case BUILT_IN_STDARG_START:
2508 return expand_builtin_va_start (1, arglist);
2509 case BUILT_IN_VA_END:
2510 return expand_builtin_va_end (arglist);
2511 case BUILT_IN_VA_COPY:
2512 return expand_builtin_va_copy (arglist);
2514 default: /* just do library call, if unknown builtin */
2515 error ("built-in function `%s' not currently supported",
2516 IDENTIFIER_POINTER (DECL_NAME (fndecl)));
2519 /* The switch statement above can drop through to cause the function
2520 to be called normally. */
2521 return expand_call (exp, target, ignore);