1 /* Emit RTL for the GNU C-Compiler expander.
2 Copyright (C) 1987, 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
23 /* Middle-to-low level generation of rtx code and insns.
25 This file contains the functions `gen_rtx', `gen_reg_rtx'
26 and `gen_label_rtx' that are the usual ways of creating rtl
27 expressions for most purposes.
29 It also has the functions for creating insns and linking
30 them in the doubly-linked chain.
32 The patterns of the insns are created by machine-dependent
33 routines in insn-emit.c, which is generated automatically from
34 the machine description. These routines use `gen_rtx' to make
35 the individual rtx's of the pattern; what is machine dependent
36 is the kind of rtx's they make and what arguments they use. */
48 #include "hard-reg-set.h"
50 #include "insn-config.h"
55 #include "basic-block.h"
58 #include "langhooks.h"
60 /* Commonly used modes. */
62 enum machine_mode byte_mode; /* Mode whose width is BITS_PER_UNIT. */
63 enum machine_mode word_mode; /* Mode whose width is BITS_PER_WORD. */
64 enum machine_mode double_mode; /* Mode whose width is DOUBLE_TYPE_SIZE. */
65 enum machine_mode ptr_mode; /* Mode whose width is POINTER_SIZE. */
68 /* This is *not* reset after each function. It gives each CODE_LABEL
69 in the entire compilation a unique label number. */
71 static int label_num = 1;
73 /* Highest label number in current function.
74 Zero means use the value of label_num instead.
75 This is nonzero only when belatedly compiling an inline function. */
77 static int last_label_num;
79 /* Value label_num had when set_new_first_and_last_label_number was called.
80 If label_num has not changed since then, last_label_num is valid. */
82 static int base_label_num;
84 /* Nonzero means do not generate NOTEs for source line numbers. */
86 static int no_line_numbers;
88 /* Commonly used rtx's, so that we only need space for one copy.
89 These are initialized once for the entire compilation.
90 All of these except perhaps the floating-point CONST_DOUBLEs
91 are unique; no other rtx-object will be equal to any of these. */
93 rtx global_rtl[GR_MAX];
95 /* We record floating-point CONST_DOUBLEs in each floating-point mode for
96 the values of 0, 1, and 2. For the integer entries and VOIDmode, we
97 record a copy of const[012]_rtx. */
99 rtx const_tiny_rtx[3][(int) MAX_MACHINE_MODE];
103 REAL_VALUE_TYPE dconst0;
104 REAL_VALUE_TYPE dconst1;
105 REAL_VALUE_TYPE dconst2;
106 REAL_VALUE_TYPE dconstm1;
108 /* All references to the following fixed hard registers go through
109 these unique rtl objects. On machines where the frame-pointer and
110 arg-pointer are the same register, they use the same unique object.
112 After register allocation, other rtl objects which used to be pseudo-regs
113 may be clobbered to refer to the frame-pointer register.
114 But references that were originally to the frame-pointer can be
115 distinguished from the others because they contain frame_pointer_rtx.
117 When to use frame_pointer_rtx and hard_frame_pointer_rtx is a little
118 tricky: until register elimination has taken place hard_frame_pointer_rtx
119 should be used if it is being set, and frame_pointer_rtx otherwise. After
120 register elimination hard_frame_pointer_rtx should always be used.
121 On machines where the two registers are same (most) then these are the
124 In an inline procedure, the stack and frame pointer rtxs may not be
125 used for anything else. */
126 rtx struct_value_rtx; /* (REG:Pmode STRUCT_VALUE_REGNUM) */
127 rtx struct_value_incoming_rtx; /* (REG:Pmode STRUCT_VALUE_INCOMING_REGNUM) */
128 rtx static_chain_rtx; /* (REG:Pmode STATIC_CHAIN_REGNUM) */
129 rtx static_chain_incoming_rtx; /* (REG:Pmode STATIC_CHAIN_INCOMING_REGNUM) */
130 rtx pic_offset_table_rtx; /* (REG:Pmode PIC_OFFSET_TABLE_REGNUM) */
132 /* This is used to implement __builtin_return_address for some machines.
133 See for instance the MIPS port. */
134 rtx return_address_pointer_rtx; /* (REG:Pmode RETURN_ADDRESS_POINTER_REGNUM) */
136 /* We make one copy of (const_int C) where C is in
137 [- MAX_SAVED_CONST_INT, MAX_SAVED_CONST_INT]
138 to save space during the compilation and simplify comparisons of
141 rtx const_int_rtx[MAX_SAVED_CONST_INT * 2 + 1];
143 /* A hash table storing CONST_INTs whose absolute value is greater
144 than MAX_SAVED_CONST_INT. */
146 static htab_t const_int_htab;
148 /* A hash table storing memory attribute structures. */
149 static htab_t mem_attrs_htab;
151 /* start_sequence and gen_sequence can make a lot of rtx expressions which are
152 shortly thrown away. We use two mechanisms to prevent this waste:
154 For sizes up to 5 elements, we keep a SEQUENCE and its associated
155 rtvec for use by gen_sequence. One entry for each size is
156 sufficient because most cases are calls to gen_sequence followed by
157 immediately emitting the SEQUENCE. Reuse is safe since emitting a
158 sequence is destructive on the insn in it anyway and hence can't be
161 We do not bother to save this cached data over nested function calls.
162 Instead, we just reinitialize them. */
164 #define SEQUENCE_RESULT_SIZE 5
166 static rtx sequence_result[SEQUENCE_RESULT_SIZE];
168 /* During RTL generation, we also keep a list of free INSN rtl codes. */
169 static rtx free_insn;
171 #define first_insn (cfun->emit->x_first_insn)
172 #define last_insn (cfun->emit->x_last_insn)
173 #define cur_insn_uid (cfun->emit->x_cur_insn_uid)
174 #define last_linenum (cfun->emit->x_last_linenum)
175 #define last_filename (cfun->emit->x_last_filename)
176 #define first_label_num (cfun->emit->x_first_label_num)
178 static rtx make_jump_insn_raw PARAMS ((rtx));
179 static rtx make_call_insn_raw PARAMS ((rtx));
180 static rtx find_line_note PARAMS ((rtx));
181 static void mark_sequence_stack PARAMS ((struct sequence_stack *));
182 static rtx change_address_1 PARAMS ((rtx, enum machine_mode, rtx,
184 static void unshare_all_rtl_1 PARAMS ((rtx));
185 static void unshare_all_decls PARAMS ((tree));
186 static void reset_used_decls PARAMS ((tree));
187 static void mark_label_nuses PARAMS ((rtx));
188 static hashval_t const_int_htab_hash PARAMS ((const void *));
189 static int const_int_htab_eq PARAMS ((const void *,
191 static hashval_t mem_attrs_htab_hash PARAMS ((const void *));
192 static int mem_attrs_htab_eq PARAMS ((const void *,
194 static void mem_attrs_mark PARAMS ((const void *));
195 static mem_attrs *get_mem_attrs PARAMS ((HOST_WIDE_INT, tree, rtx,
198 static tree component_ref_for_mem_expr PARAMS ((tree));
199 static rtx gen_const_vector_0 PARAMS ((enum machine_mode));
201 /* Probability of the conditional branch currently proceeded by try_split.
202 Set to -1 otherwise. */
203 int split_branch_probability = -1;
205 /* Returns a hash code for X (which is a really a CONST_INT). */
208 const_int_htab_hash (x)
211 return (hashval_t) INTVAL ((const struct rtx_def *) x);
214 /* Returns non-zero if the value represented by X (which is really a
215 CONST_INT) is the same as that given by Y (which is really a
219 const_int_htab_eq (x, y)
223 return (INTVAL ((const struct rtx_def *) x) == *((const HOST_WIDE_INT *) y));
226 /* Returns a hash code for X (which is a really a mem_attrs *). */
229 mem_attrs_htab_hash (x)
232 mem_attrs *p = (mem_attrs *) x;
234 return (p->alias ^ (p->align * 1000)
235 ^ ((p->offset ? INTVAL (p->offset) : 0) * 50000)
236 ^ ((p->size ? INTVAL (p->size) : 0) * 2500000)
240 /* Returns non-zero if the value represented by X (which is really a
241 mem_attrs *) is the same as that given by Y (which is also really a
245 mem_attrs_htab_eq (x, y)
249 mem_attrs *p = (mem_attrs *) x;
250 mem_attrs *q = (mem_attrs *) y;
252 return (p->alias == q->alias && p->expr == q->expr && p->offset == q->offset
253 && p->size == q->size && p->align == q->align);
256 /* This routine is called when we determine that we need a mem_attrs entry.
257 It marks the associated decl and RTL as being used, if present. */
263 mem_attrs *p = (mem_attrs *) x;
266 ggc_mark_tree (p->expr);
269 ggc_mark_rtx (p->offset);
272 ggc_mark_rtx (p->size);
275 /* Allocate a new mem_attrs structure and insert it into the hash table if
276 one identical to it is not already in the table. We are doing this for
280 get_mem_attrs (alias, expr, offset, size, align, mode)
286 enum machine_mode mode;
291 /* If everything is the default, we can just return zero. */
292 if (alias == 0 && expr == 0 && offset == 0
294 || (mode != BLKmode && GET_MODE_SIZE (mode) == INTVAL (size)))
295 && (align == BITS_PER_UNIT
297 && mode != BLKmode && align == GET_MODE_ALIGNMENT (mode))))
302 attrs.offset = offset;
306 slot = htab_find_slot (mem_attrs_htab, &attrs, INSERT);
309 *slot = ggc_alloc (sizeof (mem_attrs));
310 memcpy (*slot, &attrs, sizeof (mem_attrs));
316 /* Generate a new REG rtx. Make sure ORIGINAL_REGNO is set properly, and
317 don't attempt to share with the various global pieces of rtl (such as
318 frame_pointer_rtx). */
321 gen_raw_REG (mode, regno)
322 enum machine_mode mode;
325 rtx x = gen_rtx_raw_REG (mode, regno);
326 ORIGINAL_REGNO (x) = regno;
330 /* There are some RTL codes that require special attention; the generation
331 functions do the raw handling. If you add to this list, modify
332 special_rtx in gengenrtl.c as well. */
335 gen_rtx_CONST_INT (mode, arg)
336 enum machine_mode mode ATTRIBUTE_UNUSED;
341 if (arg >= - MAX_SAVED_CONST_INT && arg <= MAX_SAVED_CONST_INT)
342 return const_int_rtx[arg + MAX_SAVED_CONST_INT];
344 #if STORE_FLAG_VALUE != 1 && STORE_FLAG_VALUE != -1
345 if (const_true_rtx && arg == STORE_FLAG_VALUE)
346 return const_true_rtx;
349 /* Look up the CONST_INT in the hash table. */
350 slot = htab_find_slot_with_hash (const_int_htab, &arg,
351 (hashval_t) arg, INSERT);
353 *slot = gen_rtx_raw_CONST_INT (VOIDmode, arg);
358 /* CONST_DOUBLEs needs special handling because their length is known
362 gen_rtx_CONST_DOUBLE (mode, arg0, arg1)
363 enum machine_mode mode;
364 HOST_WIDE_INT arg0, arg1;
366 rtx r = rtx_alloc (CONST_DOUBLE);
370 X0EXP (r, 0) = NULL_RTX;
374 for (i = GET_RTX_LENGTH (CONST_DOUBLE) - 1; i > 2; --i)
381 gen_rtx_REG (mode, regno)
382 enum machine_mode mode;
385 /* In case the MD file explicitly references the frame pointer, have
386 all such references point to the same frame pointer. This is
387 used during frame pointer elimination to distinguish the explicit
388 references to these registers from pseudos that happened to be
391 If we have eliminated the frame pointer or arg pointer, we will
392 be using it as a normal register, for example as a spill
393 register. In such cases, we might be accessing it in a mode that
394 is not Pmode and therefore cannot use the pre-allocated rtx.
396 Also don't do this when we are making new REGs in reload, since
397 we don't want to get confused with the real pointers. */
399 if (mode == Pmode && !reload_in_progress)
401 if (regno == FRAME_POINTER_REGNUM)
402 return frame_pointer_rtx;
403 #if FRAME_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM
404 if (regno == HARD_FRAME_POINTER_REGNUM)
405 return hard_frame_pointer_rtx;
407 #if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM && HARD_FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
408 if (regno == ARG_POINTER_REGNUM)
409 return arg_pointer_rtx;
411 #ifdef RETURN_ADDRESS_POINTER_REGNUM
412 if (regno == RETURN_ADDRESS_POINTER_REGNUM)
413 return return_address_pointer_rtx;
415 if (regno == PIC_OFFSET_TABLE_REGNUM
416 && fixed_regs[PIC_OFFSET_TABLE_REGNUM])
417 return pic_offset_table_rtx;
418 if (regno == STACK_POINTER_REGNUM)
419 return stack_pointer_rtx;
422 return gen_raw_REG (mode, regno);
426 gen_rtx_MEM (mode, addr)
427 enum machine_mode mode;
430 rtx rt = gen_rtx_raw_MEM (mode, addr);
432 /* This field is not cleared by the mere allocation of the rtx, so
440 gen_rtx_SUBREG (mode, reg, offset)
441 enum machine_mode mode;
445 /* This is the most common failure type.
446 Catch it early so we can see who does it. */
447 if ((offset % GET_MODE_SIZE (mode)) != 0)
450 /* This check isn't usable right now because combine will
451 throw arbitrary crap like a CALL into a SUBREG in
452 gen_lowpart_for_combine so we must just eat it. */
454 /* Check for this too. */
455 if (offset >= GET_MODE_SIZE (GET_MODE (reg)))
458 return gen_rtx_fmt_ei (SUBREG, mode, reg, offset);
461 /* Generate a SUBREG representing the least-significant part of REG if MODE
462 is smaller than mode of REG, otherwise paradoxical SUBREG. */
465 gen_lowpart_SUBREG (mode, reg)
466 enum machine_mode mode;
469 enum machine_mode inmode;
471 inmode = GET_MODE (reg);
472 if (inmode == VOIDmode)
474 return gen_rtx_SUBREG (mode, reg,
475 subreg_lowpart_offset (mode, inmode));
478 /* rtx gen_rtx (code, mode, [element1, ..., elementn])
480 ** This routine generates an RTX of the size specified by
481 ** <code>, which is an RTX code. The RTX structure is initialized
482 ** from the arguments <element1> through <elementn>, which are
483 ** interpreted according to the specific RTX type's format. The
484 ** special machine mode associated with the rtx (if any) is specified
487 ** gen_rtx can be invoked in a way which resembles the lisp-like
488 ** rtx it will generate. For example, the following rtx structure:
490 ** (plus:QI (mem:QI (reg:SI 1))
491 ** (mem:QI (plusw:SI (reg:SI 2) (reg:SI 3))))
493 ** ...would be generated by the following C code:
495 ** gen_rtx (PLUS, QImode,
496 ** gen_rtx (MEM, QImode,
497 ** gen_rtx (REG, SImode, 1)),
498 ** gen_rtx (MEM, QImode,
499 ** gen_rtx (PLUS, SImode,
500 ** gen_rtx (REG, SImode, 2),
501 ** gen_rtx (REG, SImode, 3)))),
506 gen_rtx VPARAMS ((enum rtx_code code, enum machine_mode mode, ...))
508 int i; /* Array indices... */
509 const char *fmt; /* Current rtx's format... */
510 rtx rt_val; /* RTX to return to caller... */
513 VA_FIXEDARG (p, enum rtx_code, code);
514 VA_FIXEDARG (p, enum machine_mode, mode);
519 rt_val = gen_rtx_CONST_INT (mode, va_arg (p, HOST_WIDE_INT));
524 HOST_WIDE_INT arg0 = va_arg (p, HOST_WIDE_INT);
525 HOST_WIDE_INT arg1 = va_arg (p, HOST_WIDE_INT);
527 rt_val = gen_rtx_CONST_DOUBLE (mode, arg0, arg1);
532 rt_val = gen_rtx_REG (mode, va_arg (p, int));
536 rt_val = gen_rtx_MEM (mode, va_arg (p, rtx));
540 rt_val = rtx_alloc (code); /* Allocate the storage space. */
541 rt_val->mode = mode; /* Store the machine mode... */
543 fmt = GET_RTX_FORMAT (code); /* Find the right format... */
544 for (i = 0; i < GET_RTX_LENGTH (code); i++)
548 case '0': /* Unused field. */
551 case 'i': /* An integer? */
552 XINT (rt_val, i) = va_arg (p, int);
555 case 'w': /* A wide integer? */
556 XWINT (rt_val, i) = va_arg (p, HOST_WIDE_INT);
559 case 's': /* A string? */
560 XSTR (rt_val, i) = va_arg (p, char *);
563 case 'e': /* An expression? */
564 case 'u': /* An insn? Same except when printing. */
565 XEXP (rt_val, i) = va_arg (p, rtx);
568 case 'E': /* An RTX vector? */
569 XVEC (rt_val, i) = va_arg (p, rtvec);
572 case 'b': /* A bitmap? */
573 XBITMAP (rt_val, i) = va_arg (p, bitmap);
576 case 't': /* A tree? */
577 XTREE (rt_val, i) = va_arg (p, tree);
591 /* gen_rtvec (n, [rt1, ..., rtn])
593 ** This routine creates an rtvec and stores within it the
594 ** pointers to rtx's which are its arguments.
599 gen_rtvec VPARAMS ((int n, ...))
605 VA_FIXEDARG (p, int, n);
608 return NULL_RTVEC; /* Don't allocate an empty rtvec... */
610 vector = (rtx *) alloca (n * sizeof (rtx));
612 for (i = 0; i < n; i++)
613 vector[i] = va_arg (p, rtx);
615 /* The definition of VA_* in K&R C causes `n' to go out of scope. */
619 return gen_rtvec_v (save_n, vector);
623 gen_rtvec_v (n, argp)
631 return NULL_RTVEC; /* Don't allocate an empty rtvec... */
633 rt_val = rtvec_alloc (n); /* Allocate an rtvec... */
635 for (i = 0; i < n; i++)
636 rt_val->elem[i] = *argp++;
641 /* Generate a REG rtx for a new pseudo register of mode MODE.
642 This pseudo is assigned the next sequential register number. */
646 enum machine_mode mode;
648 struct function *f = cfun;
651 /* Don't let anything called after initial flow analysis create new
656 if (generating_concat_p
657 && (GET_MODE_CLASS (mode) == MODE_COMPLEX_FLOAT
658 || GET_MODE_CLASS (mode) == MODE_COMPLEX_INT))
660 /* For complex modes, don't make a single pseudo.
661 Instead, make a CONCAT of two pseudos.
662 This allows noncontiguous allocation of the real and imaginary parts,
663 which makes much better code. Besides, allocating DCmode
664 pseudos overstrains reload on some machines like the 386. */
665 rtx realpart, imagpart;
666 int size = GET_MODE_UNIT_SIZE (mode);
667 enum machine_mode partmode
668 = mode_for_size (size * BITS_PER_UNIT,
669 (GET_MODE_CLASS (mode) == MODE_COMPLEX_FLOAT
670 ? MODE_FLOAT : MODE_INT),
673 realpart = gen_reg_rtx (partmode);
674 imagpart = gen_reg_rtx (partmode);
675 return gen_rtx_CONCAT (mode, realpart, imagpart);
678 /* Make sure regno_pointer_align, regno_decl, and regno_reg_rtx are large
679 enough to have an element for this pseudo reg number. */
681 if (reg_rtx_no == f->emit->regno_pointer_align_length)
683 int old_size = f->emit->regno_pointer_align_length;
688 new = xrealloc (f->emit->regno_pointer_align, old_size * 2);
689 memset (new + old_size, 0, old_size);
690 f->emit->regno_pointer_align = (unsigned char *) new;
692 new1 = (rtx *) xrealloc (f->emit->x_regno_reg_rtx,
693 old_size * 2 * sizeof (rtx));
694 memset (new1 + old_size, 0, old_size * sizeof (rtx));
695 regno_reg_rtx = new1;
697 new2 = (tree *) xrealloc (f->emit->regno_decl,
698 old_size * 2 * sizeof (tree));
699 memset (new2 + old_size, 0, old_size * sizeof (tree));
700 f->emit->regno_decl = new2;
702 f->emit->regno_pointer_align_length = old_size * 2;
705 val = gen_raw_REG (mode, reg_rtx_no);
706 regno_reg_rtx[reg_rtx_no++] = val;
710 /* Identify REG (which may be a CONCAT) as a user register. */
716 if (GET_CODE (reg) == CONCAT)
718 REG_USERVAR_P (XEXP (reg, 0)) = 1;
719 REG_USERVAR_P (XEXP (reg, 1)) = 1;
721 else if (GET_CODE (reg) == REG)
722 REG_USERVAR_P (reg) = 1;
727 /* Identify REG as a probable pointer register and show its alignment
728 as ALIGN, if nonzero. */
731 mark_reg_pointer (reg, align)
735 if (! REG_POINTER (reg))
737 REG_POINTER (reg) = 1;
740 REGNO_POINTER_ALIGN (REGNO (reg)) = align;
742 else if (align && align < REGNO_POINTER_ALIGN (REGNO (reg)))
743 /* We can no-longer be sure just how aligned this pointer is */
744 REGNO_POINTER_ALIGN (REGNO (reg)) = align;
747 /* Return 1 plus largest pseudo reg number used in the current function. */
755 /* Return 1 + the largest label number used so far in the current function. */
760 if (last_label_num && label_num == base_label_num)
761 return last_label_num;
765 /* Return first label number used in this function (if any were used). */
768 get_first_label_num ()
770 return first_label_num;
773 /* Return the final regno of X, which is a SUBREG of a hard
776 subreg_hard_regno (x, check_mode)
780 enum machine_mode mode = GET_MODE (x);
781 unsigned int byte_offset, base_regno, final_regno;
782 rtx reg = SUBREG_REG (x);
784 /* This is where we attempt to catch illegal subregs
785 created by the compiler. */
786 if (GET_CODE (x) != SUBREG
787 || GET_CODE (reg) != REG)
789 base_regno = REGNO (reg);
790 if (base_regno >= FIRST_PSEUDO_REGISTER)
792 if (check_mode && ! HARD_REGNO_MODE_OK (base_regno, GET_MODE (reg)))
795 /* Catch non-congruent offsets too. */
796 byte_offset = SUBREG_BYTE (x);
797 if ((byte_offset % GET_MODE_SIZE (mode)) != 0)
800 final_regno = subreg_regno (x);
805 /* Return a value representing some low-order bits of X, where the number
806 of low-order bits is given by MODE. Note that no conversion is done
807 between floating-point and fixed-point values, rather, the bit
808 representation is returned.
810 This function handles the cases in common between gen_lowpart, below,
811 and two variants in cse.c and combine.c. These are the cases that can
812 be safely handled at all points in the compilation.
814 If this is not a case we can handle, return 0. */
817 gen_lowpart_common (mode, x)
818 enum machine_mode mode;
821 int msize = GET_MODE_SIZE (mode);
822 int xsize = GET_MODE_SIZE (GET_MODE (x));
825 if (GET_MODE (x) == mode)
828 /* MODE must occupy no more words than the mode of X. */
829 if (GET_MODE (x) != VOIDmode
830 && ((msize + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD
831 > ((xsize + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD)))
834 offset = subreg_lowpart_offset (mode, GET_MODE (x));
836 if ((GET_CODE (x) == ZERO_EXTEND || GET_CODE (x) == SIGN_EXTEND)
837 && (GET_MODE_CLASS (mode) == MODE_INT
838 || GET_MODE_CLASS (mode) == MODE_PARTIAL_INT))
840 /* If we are getting the low-order part of something that has been
841 sign- or zero-extended, we can either just use the object being
842 extended or make a narrower extension. If we want an even smaller
843 piece than the size of the object being extended, call ourselves
846 This case is used mostly by combine and cse. */
848 if (GET_MODE (XEXP (x, 0)) == mode)
850 else if (GET_MODE_SIZE (mode) < GET_MODE_SIZE (GET_MODE (XEXP (x, 0))))
851 return gen_lowpart_common (mode, XEXP (x, 0));
852 else if (GET_MODE_SIZE (mode) < GET_MODE_SIZE (GET_MODE (x)))
853 return gen_rtx_fmt_e (GET_CODE (x), mode, XEXP (x, 0));
855 else if (GET_CODE (x) == SUBREG || GET_CODE (x) == REG
856 || GET_CODE (x) == CONCAT)
857 return simplify_gen_subreg (mode, x, GET_MODE (x), offset);
858 /* If X is a CONST_INT or a CONST_DOUBLE, extract the appropriate bits
859 from the low-order part of the constant. */
860 else if ((GET_MODE_CLASS (mode) == MODE_INT
861 || GET_MODE_CLASS (mode) == MODE_PARTIAL_INT)
862 && GET_MODE (x) == VOIDmode
863 && (GET_CODE (x) == CONST_INT || GET_CODE (x) == CONST_DOUBLE))
865 /* If MODE is twice the host word size, X is already the desired
866 representation. Otherwise, if MODE is wider than a word, we can't
867 do this. If MODE is exactly a word, return just one CONST_INT. */
869 if (GET_MODE_BITSIZE (mode) >= 2 * HOST_BITS_PER_WIDE_INT)
871 else if (GET_MODE_BITSIZE (mode) > HOST_BITS_PER_WIDE_INT)
873 else if (GET_MODE_BITSIZE (mode) == HOST_BITS_PER_WIDE_INT)
874 return (GET_CODE (x) == CONST_INT ? x
875 : GEN_INT (CONST_DOUBLE_LOW (x)));
878 /* MODE must be narrower than HOST_BITS_PER_WIDE_INT. */
879 HOST_WIDE_INT val = (GET_CODE (x) == CONST_INT ? INTVAL (x)
880 : CONST_DOUBLE_LOW (x));
882 /* Sign extend to HOST_WIDE_INT. */
883 val = trunc_int_for_mode (val, mode);
885 return (GET_CODE (x) == CONST_INT && INTVAL (x) == val ? x
890 #ifndef REAL_ARITHMETIC
891 /* If X is an integral constant but we want it in floating-point, it
892 must be the case that we have a union of an integer and a floating-point
893 value. If the machine-parameters allow it, simulate that union here
894 and return the result. The two-word and single-word cases are
897 else if (((HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT
898 && HOST_BITS_PER_WIDE_INT == BITS_PER_WORD)
899 || flag_pretend_float)
900 && GET_MODE_CLASS (mode) == MODE_FLOAT
901 && GET_MODE_SIZE (mode) == UNITS_PER_WORD
902 && GET_CODE (x) == CONST_INT
903 && sizeof (float) * HOST_BITS_PER_CHAR == HOST_BITS_PER_WIDE_INT)
905 union {HOST_WIDE_INT i; float d; } u;
908 return CONST_DOUBLE_FROM_REAL_VALUE (u.d, mode);
910 else if (((HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT
911 && HOST_BITS_PER_WIDE_INT == BITS_PER_WORD)
912 || flag_pretend_float)
913 && GET_MODE_CLASS (mode) == MODE_FLOAT
914 && GET_MODE_SIZE (mode) == 2 * UNITS_PER_WORD
915 && (GET_CODE (x) == CONST_INT || GET_CODE (x) == CONST_DOUBLE)
916 && GET_MODE (x) == VOIDmode
917 && (sizeof (double) * HOST_BITS_PER_CHAR
918 == 2 * HOST_BITS_PER_WIDE_INT))
920 union {HOST_WIDE_INT i[2]; double d; } u;
921 HOST_WIDE_INT low, high;
923 if (GET_CODE (x) == CONST_INT)
924 low = INTVAL (x), high = low >> (HOST_BITS_PER_WIDE_INT -1);
926 low = CONST_DOUBLE_LOW (x), high = CONST_DOUBLE_HIGH (x);
927 #ifdef HOST_WORDS_BIG_ENDIAN
928 u.i[0] = high, u.i[1] = low;
930 u.i[0] = low, u.i[1] = high;
932 return CONST_DOUBLE_FROM_REAL_VALUE (u.d, mode);
935 /* Similarly, if this is converting a floating-point value into a
936 single-word integer. Only do this is the host and target parameters are
939 else if (((HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT
940 && HOST_BITS_PER_WIDE_INT == BITS_PER_WORD)
941 || flag_pretend_float)
942 && (GET_MODE_CLASS (mode) == MODE_INT
943 || GET_MODE_CLASS (mode) == MODE_PARTIAL_INT)
944 && GET_CODE (x) == CONST_DOUBLE
945 && GET_MODE_CLASS (GET_MODE (x)) == MODE_FLOAT
946 && GET_MODE_BITSIZE (mode) == BITS_PER_WORD)
947 return constant_subword (x, (offset / UNITS_PER_WORD), GET_MODE (x));
949 /* Similarly, if this is converting a floating-point value into a
950 two-word integer, we can do this one word at a time and make an
951 integer. Only do this is the host and target parameters are
954 else if (((HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT
955 && HOST_BITS_PER_WIDE_INT == BITS_PER_WORD)
956 || flag_pretend_float)
957 && (GET_MODE_CLASS (mode) == MODE_INT
958 || GET_MODE_CLASS (mode) == MODE_PARTIAL_INT)
959 && GET_CODE (x) == CONST_DOUBLE
960 && GET_MODE_CLASS (GET_MODE (x)) == MODE_FLOAT
961 && GET_MODE_BITSIZE (mode) == 2 * BITS_PER_WORD)
963 rtx lowpart, highpart;
965 lowpart = constant_subword (x,
966 (offset / UNITS_PER_WORD) + WORDS_BIG_ENDIAN,
968 highpart = constant_subword (x,
969 (offset / UNITS_PER_WORD) + (! WORDS_BIG_ENDIAN),
971 if (lowpart && GET_CODE (lowpart) == CONST_INT
972 && highpart && GET_CODE (highpart) == CONST_INT)
973 return immed_double_const (INTVAL (lowpart), INTVAL (highpart), mode);
975 #else /* ifndef REAL_ARITHMETIC */
977 /* When we have a FP emulator, we can handle all conversions between
978 FP and integer operands. This simplifies reload because it
979 doesn't have to deal with constructs like (subreg:DI
980 (const_double:SF ...)) or (subreg:DF (const_int ...)). */
981 /* Single-precision floats are always 32-bits and double-precision
982 floats are always 64-bits. */
984 else if (GET_MODE_CLASS (mode) == MODE_FLOAT
985 && GET_MODE_BITSIZE (mode) == 32
986 && GET_CODE (x) == CONST_INT)
992 r = REAL_VALUE_FROM_TARGET_SINGLE (i);
993 return CONST_DOUBLE_FROM_REAL_VALUE (r, mode);
995 else if (GET_MODE_CLASS (mode) == MODE_FLOAT
996 && GET_MODE_BITSIZE (mode) == 64
997 && (GET_CODE (x) == CONST_INT || GET_CODE (x) == CONST_DOUBLE)
998 && GET_MODE (x) == VOIDmode)
1002 HOST_WIDE_INT low, high;
1004 if (GET_CODE (x) == CONST_INT)
1007 high = low >> (HOST_BITS_PER_WIDE_INT - 1);
1011 low = CONST_DOUBLE_LOW (x);
1012 high = CONST_DOUBLE_HIGH (x);
1015 #if HOST_BITS_PER_WIDE_INT == 32
1016 /* REAL_VALUE_TARGET_DOUBLE takes the addressing order of the
1018 if (WORDS_BIG_ENDIAN)
1019 i[0] = high, i[1] = low;
1021 i[0] = low, i[1] = high;
1026 r = REAL_VALUE_FROM_TARGET_DOUBLE (i);
1027 return CONST_DOUBLE_FROM_REAL_VALUE (r, mode);
1029 else if ((GET_MODE_CLASS (mode) == MODE_INT
1030 || GET_MODE_CLASS (mode) == MODE_PARTIAL_INT)
1031 && GET_CODE (x) == CONST_DOUBLE
1032 && GET_MODE_CLASS (GET_MODE (x)) == MODE_FLOAT)
1035 long i[4]; /* Only the low 32 bits of each 'long' are used. */
1036 int endian = WORDS_BIG_ENDIAN ? 1 : 0;
1038 /* Convert 'r' into an array of four 32-bit words in target word
1040 REAL_VALUE_FROM_CONST_DOUBLE (r, x);
1041 switch (GET_MODE_BITSIZE (GET_MODE (x)))
1044 REAL_VALUE_TO_TARGET_SINGLE (r, i[3 * endian]);
1047 i[3 - 3 * endian] = 0;
1050 REAL_VALUE_TO_TARGET_DOUBLE (r, i + 2 * endian);
1051 i[2 - 2 * endian] = 0;
1052 i[3 - 2 * endian] = 0;
1055 REAL_VALUE_TO_TARGET_LONG_DOUBLE (r, i + endian);
1056 i[3 - 3 * endian] = 0;
1059 REAL_VALUE_TO_TARGET_LONG_DOUBLE (r, i);
1064 /* Now, pack the 32-bit elements of the array into a CONST_DOUBLE
1066 #if HOST_BITS_PER_WIDE_INT == 32
1067 return immed_double_const (i[3 * endian], i[1 + endian], mode);
1069 if (HOST_BITS_PER_WIDE_INT != 64)
1072 return immed_double_const ((((unsigned long) i[3 * endian])
1073 | ((HOST_WIDE_INT) i[1 + endian] << 32)),
1074 (((unsigned long) i[2 - endian])
1075 | ((HOST_WIDE_INT) i[3 - 3 * endian] << 32)),
1079 #endif /* ifndef REAL_ARITHMETIC */
1081 /* Otherwise, we can't do this. */
1085 /* Return the real part (which has mode MODE) of a complex value X.
1086 This always comes at the low address in memory. */
1089 gen_realpart (mode, x)
1090 enum machine_mode mode;
1093 if (WORDS_BIG_ENDIAN
1094 && GET_MODE_BITSIZE (mode) < BITS_PER_WORD
1096 && REGNO (x) < FIRST_PSEUDO_REGISTER)
1098 ("can't access real part of complex value in hard register");
1099 else if (WORDS_BIG_ENDIAN)
1100 return gen_highpart (mode, x);
1102 return gen_lowpart (mode, x);
1105 /* Return the imaginary part (which has mode MODE) of a complex value X.
1106 This always comes at the high address in memory. */
1109 gen_imagpart (mode, x)
1110 enum machine_mode mode;
1113 if (WORDS_BIG_ENDIAN)
1114 return gen_lowpart (mode, x);
1115 else if (! WORDS_BIG_ENDIAN
1116 && GET_MODE_BITSIZE (mode) < BITS_PER_WORD
1118 && REGNO (x) < FIRST_PSEUDO_REGISTER)
1120 ("can't access imaginary part of complex value in hard register");
1122 return gen_highpart (mode, x);
1125 /* Return 1 iff X, assumed to be a SUBREG,
1126 refers to the real part of the complex value in its containing reg.
1127 Complex values are always stored with the real part in the first word,
1128 regardless of WORDS_BIG_ENDIAN. */
1131 subreg_realpart_p (x)
1134 if (GET_CODE (x) != SUBREG)
1137 return ((unsigned int) SUBREG_BYTE (x)
1138 < GET_MODE_UNIT_SIZE (GET_MODE (SUBREG_REG (x))));
1141 /* Assuming that X is an rtx (e.g., MEM, REG or SUBREG) for a value,
1142 return an rtx (MEM, SUBREG, or CONST_INT) that refers to the
1143 least-significant part of X.
1144 MODE specifies how big a part of X to return;
1145 it usually should not be larger than a word.
1146 If X is a MEM whose address is a QUEUED, the value may be so also. */
1149 gen_lowpart (mode, x)
1150 enum machine_mode mode;
1153 rtx result = gen_lowpart_common (mode, x);
1157 else if (GET_CODE (x) == REG)
1159 /* Must be a hard reg that's not valid in MODE. */
1160 result = gen_lowpart_common (mode, copy_to_reg (x));
1165 else if (GET_CODE (x) == MEM)
1167 /* The only additional case we can do is MEM. */
1169 if (WORDS_BIG_ENDIAN)
1170 offset = (MAX (GET_MODE_SIZE (GET_MODE (x)), UNITS_PER_WORD)
1171 - MAX (GET_MODE_SIZE (mode), UNITS_PER_WORD));
1173 if (BYTES_BIG_ENDIAN)
1174 /* Adjust the address so that the address-after-the-data
1176 offset -= (MIN (UNITS_PER_WORD, GET_MODE_SIZE (mode))
1177 - MIN (UNITS_PER_WORD, GET_MODE_SIZE (GET_MODE (x))));
1179 return adjust_address (x, mode, offset);
1181 else if (GET_CODE (x) == ADDRESSOF)
1182 return gen_lowpart (mode, force_reg (GET_MODE (x), x));
1187 /* Like `gen_lowpart', but refer to the most significant part.
1188 This is used to access the imaginary part of a complex number. */
1191 gen_highpart (mode, x)
1192 enum machine_mode mode;
1195 unsigned int msize = GET_MODE_SIZE (mode);
1198 /* This case loses if X is a subreg. To catch bugs early,
1199 complain if an invalid MODE is used even in other cases. */
1200 if (msize > UNITS_PER_WORD
1201 && msize != GET_MODE_UNIT_SIZE (GET_MODE (x)))
1204 result = simplify_gen_subreg (mode, x, GET_MODE (x),
1205 subreg_highpart_offset (mode, GET_MODE (x)));
1207 /* simplify_gen_subreg is not guaranteed to return a valid operand for
1208 the target if we have a MEM. gen_highpart must return a valid operand,
1209 emitting code if necessary to do so. */
1210 if (result != NULL_RTX && GET_CODE (result) == MEM)
1211 result = validize_mem (result);
1218 /* Like gen_highpart_mode, but accept mode of EXP operand in case EXP can
1219 be VOIDmode constant. */
1221 gen_highpart_mode (outermode, innermode, exp)
1222 enum machine_mode outermode, innermode;
1225 if (GET_MODE (exp) != VOIDmode)
1227 if (GET_MODE (exp) != innermode)
1229 return gen_highpart (outermode, exp);
1231 return simplify_gen_subreg (outermode, exp, innermode,
1232 subreg_highpart_offset (outermode, innermode));
1234 /* Return offset in bytes to get OUTERMODE low part
1235 of the value in mode INNERMODE stored in memory in target format. */
1238 subreg_lowpart_offset (outermode, innermode)
1239 enum machine_mode outermode, innermode;
1241 unsigned int offset = 0;
1242 int difference = (GET_MODE_SIZE (innermode) - GET_MODE_SIZE (outermode));
1246 if (WORDS_BIG_ENDIAN)
1247 offset += (difference / UNITS_PER_WORD) * UNITS_PER_WORD;
1248 if (BYTES_BIG_ENDIAN)
1249 offset += difference % UNITS_PER_WORD;
1255 /* Return offset in bytes to get OUTERMODE high part
1256 of the value in mode INNERMODE stored in memory in target format. */
1258 subreg_highpart_offset (outermode, innermode)
1259 enum machine_mode outermode, innermode;
1261 unsigned int offset = 0;
1262 int difference = (GET_MODE_SIZE (innermode) - GET_MODE_SIZE (outermode));
1264 if (GET_MODE_SIZE (innermode) < GET_MODE_SIZE (outermode))
1269 if (! WORDS_BIG_ENDIAN)
1270 offset += (difference / UNITS_PER_WORD) * UNITS_PER_WORD;
1271 if (! BYTES_BIG_ENDIAN)
1272 offset += difference % UNITS_PER_WORD;
1278 /* Return 1 iff X, assumed to be a SUBREG,
1279 refers to the least significant part of its containing reg.
1280 If X is not a SUBREG, always return 1 (it is its own low part!). */
1283 subreg_lowpart_p (x)
1286 if (GET_CODE (x) != SUBREG)
1288 else if (GET_MODE (SUBREG_REG (x)) == VOIDmode)
1291 return (subreg_lowpart_offset (GET_MODE (x), GET_MODE (SUBREG_REG (x)))
1292 == SUBREG_BYTE (x));
1296 /* Helper routine for all the constant cases of operand_subword.
1297 Some places invoke this directly. */
1300 constant_subword (op, offset, mode)
1303 enum machine_mode mode;
1305 int size_ratio = HOST_BITS_PER_WIDE_INT / BITS_PER_WORD;
1308 /* If OP is already an integer word, return it. */
1309 if (GET_MODE_CLASS (mode) == MODE_INT
1310 && GET_MODE_SIZE (mode) == UNITS_PER_WORD)
1313 #ifdef REAL_ARITHMETIC
1314 /* The output is some bits, the width of the target machine's word.
1315 A wider-word host can surely hold them in a CONST_INT. A narrower-word
1317 if (HOST_BITS_PER_WIDE_INT >= BITS_PER_WORD
1318 && GET_MODE_CLASS (mode) == MODE_FLOAT
1319 && GET_MODE_BITSIZE (mode) == 64
1320 && GET_CODE (op) == CONST_DOUBLE)
1325 REAL_VALUE_FROM_CONST_DOUBLE (rv, op);
1326 REAL_VALUE_TO_TARGET_DOUBLE (rv, k);
1328 /* We handle 32-bit and >= 64-bit words here. Note that the order in
1329 which the words are written depends on the word endianness.
1330 ??? This is a potential portability problem and should
1331 be fixed at some point.
1333 We must exercise caution with the sign bit. By definition there
1334 are 32 significant bits in K; there may be more in a HOST_WIDE_INT.
1335 Consider a host with a 32-bit long and a 64-bit HOST_WIDE_INT.
1336 So we explicitly mask and sign-extend as necessary. */
1337 if (BITS_PER_WORD == 32)
1340 val = ((val & 0xffffffff) ^ 0x80000000) - 0x80000000;
1341 return GEN_INT (val);
1343 #if HOST_BITS_PER_WIDE_INT >= 64
1344 else if (BITS_PER_WORD >= 64 && offset == 0)
1346 val = k[! WORDS_BIG_ENDIAN];
1347 val = (((val & 0xffffffff) ^ 0x80000000) - 0x80000000) << 32;
1348 val |= (HOST_WIDE_INT) k[WORDS_BIG_ENDIAN] & 0xffffffff;
1349 return GEN_INT (val);
1352 else if (BITS_PER_WORD == 16)
1354 val = k[offset >> 1];
1355 if ((offset & 1) == ! WORDS_BIG_ENDIAN)
1357 val = ((val & 0xffff) ^ 0x8000) - 0x8000;
1358 return GEN_INT (val);
1363 else if (HOST_BITS_PER_WIDE_INT >= BITS_PER_WORD
1364 && GET_MODE_CLASS (mode) == MODE_FLOAT
1365 && GET_MODE_BITSIZE (mode) > 64
1366 && GET_CODE (op) == CONST_DOUBLE)
1371 REAL_VALUE_FROM_CONST_DOUBLE (rv, op);
1372 REAL_VALUE_TO_TARGET_LONG_DOUBLE (rv, k);
1374 if (BITS_PER_WORD == 32)
1377 val = ((val & 0xffffffff) ^ 0x80000000) - 0x80000000;
1378 return GEN_INT (val);
1380 #if HOST_BITS_PER_WIDE_INT >= 64
1381 else if (BITS_PER_WORD >= 64 && offset <= 1)
1383 val = k[offset * 2 + ! WORDS_BIG_ENDIAN];
1384 val = (((val & 0xffffffff) ^ 0x80000000) - 0x80000000) << 32;
1385 val |= (HOST_WIDE_INT) k[offset * 2 + WORDS_BIG_ENDIAN] & 0xffffffff;
1386 return GEN_INT (val);
1392 #else /* no REAL_ARITHMETIC */
1393 if (((HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT
1394 && HOST_BITS_PER_WIDE_INT == BITS_PER_WORD)
1395 || flag_pretend_float)
1396 && GET_MODE_CLASS (mode) == MODE_FLOAT
1397 && GET_MODE_SIZE (mode) == 2 * UNITS_PER_WORD
1398 && GET_CODE (op) == CONST_DOUBLE)
1400 /* The constant is stored in the host's word-ordering,
1401 but we want to access it in the target's word-ordering. Some
1402 compilers don't like a conditional inside macro args, so we have two
1403 copies of the return. */
1404 #ifdef HOST_WORDS_BIG_ENDIAN
1405 return GEN_INT (offset == WORDS_BIG_ENDIAN
1406 ? CONST_DOUBLE_HIGH (op) : CONST_DOUBLE_LOW (op));
1408 return GEN_INT (offset != WORDS_BIG_ENDIAN
1409 ? CONST_DOUBLE_HIGH (op) : CONST_DOUBLE_LOW (op));
1412 #endif /* no REAL_ARITHMETIC */
1414 /* Single word float is a little harder, since single- and double-word
1415 values often do not have the same high-order bits. We have already
1416 verified that we want the only defined word of the single-word value. */
1417 #ifdef REAL_ARITHMETIC
1418 if (GET_MODE_CLASS (mode) == MODE_FLOAT
1419 && GET_MODE_BITSIZE (mode) == 32
1420 && GET_CODE (op) == CONST_DOUBLE)
1425 REAL_VALUE_FROM_CONST_DOUBLE (rv, op);
1426 REAL_VALUE_TO_TARGET_SINGLE (rv, l);
1428 /* Sign extend from known 32-bit value to HOST_WIDE_INT. */
1430 val = ((val & 0xffffffff) ^ 0x80000000) - 0x80000000;
1432 if (BITS_PER_WORD == 16)
1434 if ((offset & 1) == ! WORDS_BIG_ENDIAN)
1436 val = ((val & 0xffff) ^ 0x8000) - 0x8000;
1439 return GEN_INT (val);
1442 if (((HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT
1443 && HOST_BITS_PER_WIDE_INT == BITS_PER_WORD)
1444 || flag_pretend_float)
1445 && sizeof (float) * 8 == HOST_BITS_PER_WIDE_INT
1446 && GET_MODE_CLASS (mode) == MODE_FLOAT
1447 && GET_MODE_SIZE (mode) == UNITS_PER_WORD
1448 && GET_CODE (op) == CONST_DOUBLE)
1451 union {float f; HOST_WIDE_INT i; } u;
1453 REAL_VALUE_FROM_CONST_DOUBLE (d, op);
1456 return GEN_INT (u.i);
1458 if (((HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT
1459 && HOST_BITS_PER_WIDE_INT == BITS_PER_WORD)
1460 || flag_pretend_float)
1461 && sizeof (double) * 8 == HOST_BITS_PER_WIDE_INT
1462 && GET_MODE_CLASS (mode) == MODE_FLOAT
1463 && GET_MODE_SIZE (mode) == UNITS_PER_WORD
1464 && GET_CODE (op) == CONST_DOUBLE)
1467 union {double d; HOST_WIDE_INT i; } u;
1469 REAL_VALUE_FROM_CONST_DOUBLE (d, op);
1472 return GEN_INT (u.i);
1474 #endif /* no REAL_ARITHMETIC */
1476 /* The only remaining cases that we can handle are integers.
1477 Convert to proper endianness now since these cases need it.
1478 At this point, offset == 0 means the low-order word.
1480 We do not want to handle the case when BITS_PER_WORD <= HOST_BITS_PER_INT
1481 in general. However, if OP is (const_int 0), we can just return
1484 if (op == const0_rtx)
1487 if (GET_MODE_CLASS (mode) != MODE_INT
1488 || (GET_CODE (op) != CONST_INT && GET_CODE (op) != CONST_DOUBLE)
1489 || BITS_PER_WORD > HOST_BITS_PER_WIDE_INT)
1492 if (WORDS_BIG_ENDIAN)
1493 offset = GET_MODE_SIZE (mode) / UNITS_PER_WORD - 1 - offset;
1495 /* Find out which word on the host machine this value is in and get
1496 it from the constant. */
1497 val = (offset / size_ratio == 0
1498 ? (GET_CODE (op) == CONST_INT ? INTVAL (op) : CONST_DOUBLE_LOW (op))
1499 : (GET_CODE (op) == CONST_INT
1500 ? (INTVAL (op) < 0 ? ~0 : 0) : CONST_DOUBLE_HIGH (op)));
1502 /* Get the value we want into the low bits of val. */
1503 if (BITS_PER_WORD < HOST_BITS_PER_WIDE_INT)
1504 val = ((val >> ((offset % size_ratio) * BITS_PER_WORD)));
1506 val = trunc_int_for_mode (val, word_mode);
1508 return GEN_INT (val);
1511 /* Return subword OFFSET of operand OP.
1512 The word number, OFFSET, is interpreted as the word number starting
1513 at the low-order address. OFFSET 0 is the low-order word if not
1514 WORDS_BIG_ENDIAN, otherwise it is the high-order word.
1516 If we cannot extract the required word, we return zero. Otherwise,
1517 an rtx corresponding to the requested word will be returned.
1519 VALIDATE_ADDRESS is nonzero if the address should be validated. Before
1520 reload has completed, a valid address will always be returned. After
1521 reload, if a valid address cannot be returned, we return zero.
1523 If VALIDATE_ADDRESS is zero, we simply form the required address; validating
1524 it is the responsibility of the caller.
1526 MODE is the mode of OP in case it is a CONST_INT.
1528 ??? This is still rather broken for some cases. The problem for the
1529 moment is that all callers of this thing provide no 'goal mode' to
1530 tell us to work with. This exists because all callers were written
1531 in a word based SUBREG world.
1532 Now use of this function can be deprecated by simplify_subreg in most
1537 operand_subword (op, offset, validate_address, mode)
1539 unsigned int offset;
1540 int validate_address;
1541 enum machine_mode mode;
1543 if (mode == VOIDmode)
1544 mode = GET_MODE (op);
1546 if (mode == VOIDmode)
1549 /* If OP is narrower than a word, fail. */
1551 && (GET_MODE_SIZE (mode) < UNITS_PER_WORD))
1554 /* If we want a word outside OP, return zero. */
1556 && (offset + 1) * UNITS_PER_WORD > GET_MODE_SIZE (mode))
1559 /* Form a new MEM at the requested address. */
1560 if (GET_CODE (op) == MEM)
1562 rtx new = adjust_address_nv (op, word_mode, offset * UNITS_PER_WORD);
1564 if (! validate_address)
1567 else if (reload_completed)
1569 if (! strict_memory_address_p (word_mode, XEXP (new, 0)))
1573 return replace_equiv_address (new, XEXP (new, 0));
1576 /* Rest can be handled by simplify_subreg. */
1577 return simplify_gen_subreg (word_mode, op, mode, (offset * UNITS_PER_WORD));
1580 /* Similar to `operand_subword', but never return 0. If we can't extract
1581 the required subword, put OP into a register and try again. If that fails,
1582 abort. We always validate the address in this case.
1584 MODE is the mode of OP, in case it is CONST_INT. */
1587 operand_subword_force (op, offset, mode)
1589 unsigned int offset;
1590 enum machine_mode mode;
1592 rtx result = operand_subword (op, offset, 1, mode);
1597 if (mode != BLKmode && mode != VOIDmode)
1599 /* If this is a register which can not be accessed by words, copy it
1600 to a pseudo register. */
1601 if (GET_CODE (op) == REG)
1602 op = copy_to_reg (op);
1604 op = force_reg (mode, op);
1607 result = operand_subword (op, offset, 1, mode);
1614 /* Given a compare instruction, swap the operands.
1615 A test instruction is changed into a compare of 0 against the operand. */
1618 reverse_comparison (insn)
1621 rtx body = PATTERN (insn);
1624 if (GET_CODE (body) == SET)
1625 comp = SET_SRC (body);
1627 comp = SET_SRC (XVECEXP (body, 0, 0));
1629 if (GET_CODE (comp) == COMPARE)
1631 rtx op0 = XEXP (comp, 0);
1632 rtx op1 = XEXP (comp, 1);
1633 XEXP (comp, 0) = op1;
1634 XEXP (comp, 1) = op0;
1638 rtx new = gen_rtx_COMPARE (VOIDmode,
1639 CONST0_RTX (GET_MODE (comp)), comp);
1640 if (GET_CODE (body) == SET)
1641 SET_SRC (body) = new;
1643 SET_SRC (XVECEXP (body, 0, 0)) = new;
1647 /* Within a MEM_EXPR, we care about either (1) a component ref of a decl,
1648 or (2) a component ref of something variable. Represent the later with
1649 a NULL expression. */
1652 component_ref_for_mem_expr (ref)
1655 tree inner = TREE_OPERAND (ref, 0);
1657 if (TREE_CODE (inner) == COMPONENT_REF)
1658 inner = component_ref_for_mem_expr (inner);
1661 tree placeholder_ptr = 0;
1663 /* Now remove any conversions: they don't change what the underlying
1664 object is. Likewise for SAVE_EXPR. Also handle PLACEHOLDER_EXPR. */
1665 while (TREE_CODE (inner) == NOP_EXPR || TREE_CODE (inner) == CONVERT_EXPR
1666 || TREE_CODE (inner) == NON_LVALUE_EXPR
1667 || TREE_CODE (inner) == VIEW_CONVERT_EXPR
1668 || TREE_CODE (inner) == SAVE_EXPR
1669 || TREE_CODE (inner) == PLACEHOLDER_EXPR)
1670 if (TREE_CODE (inner) == PLACEHOLDER_EXPR)
1671 inner = find_placeholder (inner, &placeholder_ptr);
1673 inner = TREE_OPERAND (inner, 0);
1675 if (! DECL_P (inner))
1679 if (inner == TREE_OPERAND (ref, 0))
1682 return build (COMPONENT_REF, TREE_TYPE (ref), inner,
1683 TREE_OPERAND (ref, 1));
1686 /* Given REF, a MEM, and T, either the type of X or the expression
1687 corresponding to REF, set the memory attributes. OBJECTP is nonzero
1688 if we are making a new object of this type. */
1691 set_mem_attributes (ref, t, objectp)
1696 HOST_WIDE_INT alias = MEM_ALIAS_SET (ref);
1697 tree expr = MEM_EXPR (ref);
1698 rtx offset = MEM_OFFSET (ref);
1699 rtx size = MEM_SIZE (ref);
1700 unsigned int align = MEM_ALIGN (ref);
1703 /* It can happen that type_for_mode was given a mode for which there
1704 is no language-level type. In which case it returns NULL, which
1709 type = TYPE_P (t) ? t : TREE_TYPE (t);
1711 /* If we have already set DECL_RTL = ref, get_alias_set will get the
1712 wrong answer, as it assumes that DECL_RTL already has the right alias
1713 info. Callers should not set DECL_RTL until after the call to
1714 set_mem_attributes. */
1715 if (DECL_P (t) && ref == DECL_RTL_IF_SET (t))
1718 /* Get the alias set from the expression or type (perhaps using a
1719 front-end routine) and use it. */
1720 alias = get_alias_set (t);
1722 MEM_VOLATILE_P (ref) = TYPE_VOLATILE (type);
1723 MEM_IN_STRUCT_P (ref) = AGGREGATE_TYPE_P (type);
1724 RTX_UNCHANGING_P (ref)
1725 |= ((lang_hooks.honor_readonly
1726 && (TYPE_READONLY (type) || TREE_READONLY (t)))
1727 || (! TYPE_P (t) && TREE_CONSTANT (t)));
1729 /* If we are making an object of this type, or if this is a DECL, we know
1730 that it is a scalar if the type is not an aggregate. */
1731 if ((objectp || DECL_P (t)) && ! AGGREGATE_TYPE_P (type))
1732 MEM_SCALAR_P (ref) = 1;
1734 /* We can set the alignment from the type if we are making an object,
1735 this is an INDIRECT_REF, or if TYPE_ALIGN_OK. */
1736 if (objectp || TREE_CODE (t) == INDIRECT_REF || TYPE_ALIGN_OK (type))
1737 align = MAX (align, TYPE_ALIGN (type));
1739 /* If the size is known, we can set that. */
1740 if (TYPE_SIZE_UNIT (type) && host_integerp (TYPE_SIZE_UNIT (type), 1))
1741 size = GEN_INT (tree_low_cst (TYPE_SIZE_UNIT (type), 1));
1743 /* If T is not a type, we may be able to deduce some more information about
1747 maybe_set_unchanging (ref, t);
1748 if (TREE_THIS_VOLATILE (t))
1749 MEM_VOLATILE_P (ref) = 1;
1751 /* Now remove any conversions: they don't change what the underlying
1752 object is. Likewise for SAVE_EXPR. */
1753 while (TREE_CODE (t) == NOP_EXPR || TREE_CODE (t) == CONVERT_EXPR
1754 || TREE_CODE (t) == NON_LVALUE_EXPR
1755 || TREE_CODE (t) == VIEW_CONVERT_EXPR
1756 || TREE_CODE (t) == SAVE_EXPR)
1757 t = TREE_OPERAND (t, 0);
1759 /* If this expression can't be addressed (e.g., it contains a reference
1760 to a non-addressable field), show we don't change its alias set. */
1761 if (! can_address_p (t))
1762 MEM_KEEP_ALIAS_SET_P (ref) = 1;
1764 /* If this is a decl, set the attributes of the MEM from it. */
1768 offset = const0_rtx;
1769 size = (DECL_SIZE_UNIT (t)
1770 && host_integerp (DECL_SIZE_UNIT (t), 1)
1771 ? GEN_INT (tree_low_cst (DECL_SIZE_UNIT (t), 1)) : 0);
1772 align = DECL_ALIGN (t);
1775 /* If this is a constant, we know the alignment. */
1776 else if (TREE_CODE_CLASS (TREE_CODE (t)) == 'c')
1778 align = TYPE_ALIGN (type);
1779 #ifdef CONSTANT_ALIGNMENT
1780 align = CONSTANT_ALIGNMENT (t, align);
1784 /* If this is a field reference and not a bit-field, record it. */
1785 /* ??? There is some information that can be gleened from bit-fields,
1786 such as the word offset in the structure that might be modified.
1787 But skip it for now. */
1788 else if (TREE_CODE (t) == COMPONENT_REF
1789 && ! DECL_BIT_FIELD (TREE_OPERAND (t, 1)))
1791 expr = component_ref_for_mem_expr (t);
1792 offset = const0_rtx;
1793 /* ??? Any reason the field size would be different than
1794 the size we got from the type? */
1797 /* If this is an array reference, look for an outer field reference. */
1798 else if (TREE_CODE (t) == ARRAY_REF)
1800 tree off_tree = size_zero_node;
1805 = fold (build (PLUS_EXPR, sizetype,
1806 fold (build (MULT_EXPR, sizetype,
1807 TREE_OPERAND (t, 1),
1808 TYPE_SIZE_UNIT (TREE_TYPE (t)))),
1810 t = TREE_OPERAND (t, 0);
1812 while (TREE_CODE (t) == ARRAY_REF);
1814 if (TREE_CODE (t) == COMPONENT_REF)
1816 expr = component_ref_for_mem_expr (t);
1817 if (host_integerp (off_tree, 1))
1818 offset = GEN_INT (tree_low_cst (off_tree, 1));
1819 /* ??? Any reason the field size would be different than
1820 the size we got from the type? */
1825 /* Now set the attributes we computed above. */
1827 = get_mem_attrs (alias, expr, offset, size, align, GET_MODE (ref));
1829 /* If this is already known to be a scalar or aggregate, we are done. */
1830 if (MEM_IN_STRUCT_P (ref) || MEM_SCALAR_P (ref))
1833 /* If it is a reference into an aggregate, this is part of an aggregate.
1834 Otherwise we don't know. */
1835 else if (TREE_CODE (t) == COMPONENT_REF || TREE_CODE (t) == ARRAY_REF
1836 || TREE_CODE (t) == ARRAY_RANGE_REF
1837 || TREE_CODE (t) == BIT_FIELD_REF)
1838 MEM_IN_STRUCT_P (ref) = 1;
1841 /* Set the alias set of MEM to SET. */
1844 set_mem_alias_set (mem, set)
1848 #ifdef ENABLE_CHECKING
1849 /* If the new and old alias sets don't conflict, something is wrong. */
1850 if (!alias_sets_conflict_p (set, MEM_ALIAS_SET (mem)))
1854 MEM_ATTRS (mem) = get_mem_attrs (set, MEM_EXPR (mem), MEM_OFFSET (mem),
1855 MEM_SIZE (mem), MEM_ALIGN (mem),
1859 /* Set the alignment of MEM to ALIGN bits. */
1862 set_mem_align (mem, align)
1866 MEM_ATTRS (mem) = get_mem_attrs (MEM_ALIAS_SET (mem), MEM_EXPR (mem),
1867 MEM_OFFSET (mem), MEM_SIZE (mem), align,
1871 /* Set the expr for MEM to EXPR. */
1874 set_mem_expr (mem, expr)
1879 = get_mem_attrs (MEM_ALIAS_SET (mem), expr, MEM_OFFSET (mem),
1880 MEM_SIZE (mem), MEM_ALIGN (mem), GET_MODE (mem));
1883 /* Set the offset of MEM to OFFSET. */
1886 set_mem_offset (mem, offset)
1889 MEM_ATTRS (mem) = get_mem_attrs (MEM_ALIAS_SET (mem), MEM_EXPR (mem),
1890 offset, MEM_SIZE (mem), MEM_ALIGN (mem),
1894 /* Return a memory reference like MEMREF, but with its mode changed to MODE
1895 and its address changed to ADDR. (VOIDmode means don't change the mode.
1896 NULL for ADDR means don't change the address.) VALIDATE is nonzero if the
1897 returned memory location is required to be valid. The memory
1898 attributes are not changed. */
1901 change_address_1 (memref, mode, addr, validate)
1903 enum machine_mode mode;
1909 if (GET_CODE (memref) != MEM)
1911 if (mode == VOIDmode)
1912 mode = GET_MODE (memref);
1914 addr = XEXP (memref, 0);
1918 if (reload_in_progress || reload_completed)
1920 if (! memory_address_p (mode, addr))
1924 addr = memory_address (mode, addr);
1927 if (rtx_equal_p (addr, XEXP (memref, 0)) && mode == GET_MODE (memref))
1930 new = gen_rtx_MEM (mode, addr);
1931 MEM_COPY_ATTRIBUTES (new, memref);
1935 /* Like change_address_1 with VALIDATE nonzero, but we are not saying in what
1936 way we are changing MEMREF, so we only preserve the alias set. */
1939 change_address (memref, mode, addr)
1941 enum machine_mode mode;
1944 rtx new = change_address_1 (memref, mode, addr, 1);
1945 enum machine_mode mmode = GET_MODE (new);
1948 = get_mem_attrs (MEM_ALIAS_SET (memref), 0, 0,
1949 mmode == BLKmode ? 0 : GEN_INT (GET_MODE_SIZE (mmode)),
1950 (mmode == BLKmode ? BITS_PER_UNIT
1951 : GET_MODE_ALIGNMENT (mmode)),
1957 /* Return a memory reference like MEMREF, but with its mode changed
1958 to MODE and its address offset by OFFSET bytes. If VALIDATE is
1959 nonzero, the memory address is forced to be valid.
1960 If ADJUST is zero, OFFSET is only used to update MEM_ATTRS
1961 and caller is responsible for adjusting MEMREF base register. */
1964 adjust_address_1 (memref, mode, offset, validate, adjust)
1966 enum machine_mode mode;
1967 HOST_WIDE_INT offset;
1968 int validate, adjust;
1970 rtx addr = XEXP (memref, 0);
1972 rtx memoffset = MEM_OFFSET (memref);
1974 unsigned int memalign = MEM_ALIGN (memref);
1976 /* ??? Prefer to create garbage instead of creating shared rtl.
1977 This may happen even if offset is non-zero -- consider
1978 (plus (plus reg reg) const_int) -- so do this always. */
1979 addr = copy_rtx (addr);
1983 /* If MEMREF is a LO_SUM and the offset is within the alignment of the
1984 object, we can merge it into the LO_SUM. */
1985 if (GET_MODE (memref) != BLKmode && GET_CODE (addr) == LO_SUM
1987 && (unsigned HOST_WIDE_INT) offset
1988 < GET_MODE_ALIGNMENT (GET_MODE (memref)) / BITS_PER_UNIT)
1989 addr = gen_rtx_LO_SUM (Pmode, XEXP (addr, 0),
1990 plus_constant (XEXP (addr, 1), offset));
1992 addr = plus_constant (addr, offset);
1995 new = change_address_1 (memref, mode, addr, validate);
1997 /* Compute the new values of the memory attributes due to this adjustment.
1998 We add the offsets and update the alignment. */
2000 memoffset = GEN_INT (offset + INTVAL (memoffset));
2002 /* Compute the new alignment by taking the MIN of the alignment and the
2003 lowest-order set bit in OFFSET, but don't change the alignment if OFFSET
2006 memalign = MIN (memalign,
2007 (unsigned int) (offset & -offset) * BITS_PER_UNIT);
2009 /* We can compute the size in a number of ways. */
2010 if (GET_MODE (new) != BLKmode)
2011 size = GEN_INT (GET_MODE_SIZE (GET_MODE (new)));
2012 else if (MEM_SIZE (memref))
2013 size = plus_constant (MEM_SIZE (memref), -offset);
2015 MEM_ATTRS (new) = get_mem_attrs (MEM_ALIAS_SET (memref), MEM_EXPR (memref),
2016 memoffset, size, memalign, GET_MODE (new));
2018 /* At some point, we should validate that this offset is within the object,
2019 if all the appropriate values are known. */
2023 /* Return a memory reference like MEMREF, but with its mode changed
2024 to MODE and its address changed to ADDR, which is assumed to be
2025 MEMREF offseted by OFFSET bytes. If VALIDATE is
2026 nonzero, the memory address is forced to be valid. */
2029 adjust_automodify_address_1 (memref, mode, addr, offset, validate)
2031 enum machine_mode mode;
2033 HOST_WIDE_INT offset;
2036 memref = change_address_1 (memref, VOIDmode, addr, validate);
2037 return adjust_address_1 (memref, mode, offset, validate, 0);
2040 /* Return a memory reference like MEMREF, but whose address is changed by
2041 adding OFFSET, an RTX, to it. POW2 is the highest power of two factor
2042 known to be in OFFSET (possibly 1). */
2045 offset_address (memref, offset, pow2)
2050 rtx new, addr = XEXP (memref, 0);
2052 new = simplify_gen_binary (PLUS, Pmode, addr, offset);
2054 /* At this point we don't know _why_ the address is invalid. It
2055 could have secondary memory refereces, multiplies or anything.
2057 However, if we did go and rearrange things, we can wind up not
2058 being able to recognize the magic around pic_offset_table_rtx.
2059 This stuff is fragile, and is yet another example of why it is
2060 bad to expose PIC machinery too early. */
2061 if (! memory_address_p (GET_MODE (memref), new)
2062 && GET_CODE (addr) == PLUS
2063 && XEXP (addr, 0) == pic_offset_table_rtx)
2065 addr = force_reg (GET_MODE (addr), addr);
2066 new = simplify_gen_binary (PLUS, Pmode, addr, offset);
2069 update_temp_slot_address (XEXP (memref, 0), new);
2070 new = change_address_1 (memref, VOIDmode, new, 1);
2072 /* Update the alignment to reflect the offset. Reset the offset, which
2075 = get_mem_attrs (MEM_ALIAS_SET (memref), MEM_EXPR (memref), 0, 0,
2076 MIN (MEM_ALIGN (memref),
2077 (unsigned int) pow2 * BITS_PER_UNIT),
2082 /* Return a memory reference like MEMREF, but with its address changed to
2083 ADDR. The caller is asserting that the actual piece of memory pointed
2084 to is the same, just the form of the address is being changed, such as
2085 by putting something into a register. */
2088 replace_equiv_address (memref, addr)
2092 /* change_address_1 copies the memory attribute structure without change
2093 and that's exactly what we want here. */
2094 update_temp_slot_address (XEXP (memref, 0), addr);
2095 return change_address_1 (memref, VOIDmode, addr, 1);
2098 /* Likewise, but the reference is not required to be valid. */
2101 replace_equiv_address_nv (memref, addr)
2105 return change_address_1 (memref, VOIDmode, addr, 0);
2108 /* Return a memory reference like MEMREF, but with its mode widened to
2109 MODE and offset by OFFSET. This would be used by targets that e.g.
2110 cannot issue QImode memory operations and have to use SImode memory
2111 operations plus masking logic. */
2114 widen_memory_access (memref, mode, offset)
2116 enum machine_mode mode;
2117 HOST_WIDE_INT offset;
2119 rtx new = adjust_address_1 (memref, mode, offset, 1, 1);
2120 tree expr = MEM_EXPR (new);
2121 rtx memoffset = MEM_OFFSET (new);
2122 unsigned int size = GET_MODE_SIZE (mode);
2124 /* If we don't know what offset we were at within the expression, then
2125 we can't know if we've overstepped the bounds. */
2126 if (! memoffset && offset != 0)
2131 if (TREE_CODE (expr) == COMPONENT_REF)
2133 tree field = TREE_OPERAND (expr, 1);
2135 if (! DECL_SIZE_UNIT (field))
2141 /* Is the field at least as large as the access? If so, ok,
2142 otherwise strip back to the containing structure. */
2143 if (TREE_CODE (DECL_SIZE_UNIT (field)) == INTEGER_CST
2144 && compare_tree_int (DECL_SIZE_UNIT (field), size) >= 0
2145 && INTVAL (memoffset) >= 0)
2148 if (! host_integerp (DECL_FIELD_OFFSET (field), 1))
2154 expr = TREE_OPERAND (expr, 0);
2155 memoffset = (GEN_INT (INTVAL (memoffset)
2156 + tree_low_cst (DECL_FIELD_OFFSET (field), 1)
2157 + (tree_low_cst (DECL_FIELD_BIT_OFFSET (field), 1)
2160 /* Similarly for the decl. */
2161 else if (DECL_P (expr)
2162 && DECL_SIZE_UNIT (expr)
2163 && compare_tree_int (DECL_SIZE_UNIT (expr), size) >= 0
2164 && (! memoffset || INTVAL (memoffset) >= 0))
2168 /* The widened memory access overflows the expression, which means
2169 that it could alias another expression. Zap it. */
2176 memoffset = NULL_RTX;
2178 /* The widened memory may alias other stuff, so zap the alias set. */
2179 /* ??? Maybe use get_alias_set on any remaining expression. */
2181 MEM_ATTRS (new) = get_mem_attrs (0, expr, memoffset, GEN_INT (size),
2182 MEM_ALIGN (new), mode);
2187 /* Return a newly created CODE_LABEL rtx with a unique label number. */
2194 label = gen_rtx_CODE_LABEL (VOIDmode, 0, NULL_RTX,
2195 NULL_RTX, label_num++, NULL, NULL);
2197 LABEL_NUSES (label) = 0;
2198 LABEL_ALTERNATE_NAME (label) = NULL;
2202 /* For procedure integration. */
2204 /* Install new pointers to the first and last insns in the chain.
2205 Also, set cur_insn_uid to one higher than the last in use.
2206 Used for an inline-procedure after copying the insn chain. */
2209 set_new_first_and_last_insn (first, last)
2218 for (insn = first; insn; insn = NEXT_INSN (insn))
2219 cur_insn_uid = MAX (cur_insn_uid, INSN_UID (insn));
2224 /* Set the range of label numbers found in the current function.
2225 This is used when belatedly compiling an inline function. */
2228 set_new_first_and_last_label_num (first, last)
2231 base_label_num = label_num;
2232 first_label_num = first;
2233 last_label_num = last;
2236 /* Set the last label number found in the current function.
2237 This is used when belatedly compiling an inline function. */
2240 set_new_last_label_num (last)
2243 base_label_num = label_num;
2244 last_label_num = last;
2247 /* Restore all variables describing the current status from the structure *P.
2248 This is used after a nested function. */
2251 restore_emit_status (p)
2252 struct function *p ATTRIBUTE_UNUSED;
2255 clear_emit_caches ();
2258 /* Clear out all parts of the state in F that can safely be discarded
2259 after the function has been compiled, to let garbage collection
2260 reclaim the memory. */
2263 free_emit_status (f)
2266 free (f->emit->x_regno_reg_rtx);
2267 free (f->emit->regno_pointer_align);
2268 free (f->emit->regno_decl);
2273 /* Go through all the RTL insn bodies and copy any invalid shared
2274 structure. This routine should only be called once. */
2277 unshare_all_rtl (fndecl, insn)
2283 /* Make sure that virtual parameters are not shared. */
2284 for (decl = DECL_ARGUMENTS (fndecl); decl; decl = TREE_CHAIN (decl))
2285 SET_DECL_RTL (decl, copy_rtx_if_shared (DECL_RTL (decl)));
2287 /* Make sure that virtual stack slots are not shared. */
2288 unshare_all_decls (DECL_INITIAL (fndecl));
2290 /* Unshare just about everything else. */
2291 unshare_all_rtl_1 (insn);
2293 /* Make sure the addresses of stack slots found outside the insn chain
2294 (such as, in DECL_RTL of a variable) are not shared
2295 with the insn chain.
2297 This special care is necessary when the stack slot MEM does not
2298 actually appear in the insn chain. If it does appear, its address
2299 is unshared from all else at that point. */
2300 stack_slot_list = copy_rtx_if_shared (stack_slot_list);
2303 /* Go through all the RTL insn bodies and copy any invalid shared
2304 structure, again. This is a fairly expensive thing to do so it
2305 should be done sparingly. */
2308 unshare_all_rtl_again (insn)
2314 for (p = insn; p; p = NEXT_INSN (p))
2317 reset_used_flags (PATTERN (p));
2318 reset_used_flags (REG_NOTES (p));
2319 reset_used_flags (LOG_LINKS (p));
2322 /* Make sure that virtual stack slots are not shared. */
2323 reset_used_decls (DECL_INITIAL (cfun->decl));
2325 /* Make sure that virtual parameters are not shared. */
2326 for (decl = DECL_ARGUMENTS (cfun->decl); decl; decl = TREE_CHAIN (decl))
2327 reset_used_flags (DECL_RTL (decl));
2329 reset_used_flags (stack_slot_list);
2331 unshare_all_rtl (cfun->decl, insn);
2334 /* Go through all the RTL insn bodies and copy any invalid shared structure.
2335 Assumes the mark bits are cleared at entry. */
2338 unshare_all_rtl_1 (insn)
2341 for (; insn; insn = NEXT_INSN (insn))
2344 PATTERN (insn) = copy_rtx_if_shared (PATTERN (insn));
2345 REG_NOTES (insn) = copy_rtx_if_shared (REG_NOTES (insn));
2346 LOG_LINKS (insn) = copy_rtx_if_shared (LOG_LINKS (insn));
2350 /* Go through all virtual stack slots of a function and copy any
2351 shared structure. */
2353 unshare_all_decls (blk)
2358 /* Copy shared decls. */
2359 for (t = BLOCK_VARS (blk); t; t = TREE_CHAIN (t))
2360 if (DECL_RTL_SET_P (t))
2361 SET_DECL_RTL (t, copy_rtx_if_shared (DECL_RTL (t)));
2363 /* Now process sub-blocks. */
2364 for (t = BLOCK_SUBBLOCKS (blk); t; t = TREE_CHAIN (t))
2365 unshare_all_decls (t);
2368 /* Go through all virtual stack slots of a function and mark them as
2371 reset_used_decls (blk)
2377 for (t = BLOCK_VARS (blk); t; t = TREE_CHAIN (t))
2378 if (DECL_RTL_SET_P (t))
2379 reset_used_flags (DECL_RTL (t));
2381 /* Now process sub-blocks. */
2382 for (t = BLOCK_SUBBLOCKS (blk); t; t = TREE_CHAIN (t))
2383 reset_used_decls (t);
2386 /* Mark ORIG as in use, and return a copy of it if it was already in use.
2387 Recursively does the same for subexpressions. */
2390 copy_rtx_if_shared (orig)
2396 const char *format_ptr;
2402 code = GET_CODE (x);
2404 /* These types may be freely shared. */
2418 /* SCRATCH must be shared because they represent distinct values. */
2422 /* CONST can be shared if it contains a SYMBOL_REF. If it contains
2423 a LABEL_REF, it isn't sharable. */
2424 if (GET_CODE (XEXP (x, 0)) == PLUS
2425 && GET_CODE (XEXP (XEXP (x, 0), 0)) == SYMBOL_REF
2426 && GET_CODE (XEXP (XEXP (x, 0), 1)) == CONST_INT)
2435 /* The chain of insns is not being copied. */
2439 /* A MEM is allowed to be shared if its address is constant.
2441 We used to allow sharing of MEMs which referenced
2442 virtual_stack_vars_rtx or virtual_incoming_args_rtx, but
2443 that can lose. instantiate_virtual_regs will not unshare
2444 the MEMs, and combine may change the structure of the address
2445 because it looks safe and profitable in one context, but
2446 in some other context it creates unrecognizable RTL. */
2447 if (CONSTANT_ADDRESS_P (XEXP (x, 0)))
2456 /* This rtx may not be shared. If it has already been seen,
2457 replace it with a copy of itself. */
2463 copy = rtx_alloc (code);
2465 (sizeof (*copy) - sizeof (copy->fld)
2466 + sizeof (copy->fld[0]) * GET_RTX_LENGTH (code)));
2472 /* Now scan the subexpressions recursively.
2473 We can store any replaced subexpressions directly into X
2474 since we know X is not shared! Any vectors in X
2475 must be copied if X was copied. */
2477 format_ptr = GET_RTX_FORMAT (code);
2479 for (i = 0; i < GET_RTX_LENGTH (code); i++)
2481 switch (*format_ptr++)
2484 XEXP (x, i) = copy_rtx_if_shared (XEXP (x, i));
2488 if (XVEC (x, i) != NULL)
2491 int len = XVECLEN (x, i);
2493 if (copied && len > 0)
2494 XVEC (x, i) = gen_rtvec_v (len, XVEC (x, i)->elem);
2495 for (j = 0; j < len; j++)
2496 XVECEXP (x, i, j) = copy_rtx_if_shared (XVECEXP (x, i, j));
2504 /* Clear all the USED bits in X to allow copy_rtx_if_shared to be used
2505 to look for shared sub-parts. */
2508 reset_used_flags (x)
2513 const char *format_ptr;
2518 code = GET_CODE (x);
2520 /* These types may be freely shared so we needn't do any resetting
2542 /* The chain of insns is not being copied. */
2551 format_ptr = GET_RTX_FORMAT (code);
2552 for (i = 0; i < GET_RTX_LENGTH (code); i++)
2554 switch (*format_ptr++)
2557 reset_used_flags (XEXP (x, i));
2561 for (j = 0; j < XVECLEN (x, i); j++)
2562 reset_used_flags (XVECEXP (x, i, j));
2568 /* Copy X if necessary so that it won't be altered by changes in OTHER.
2569 Return X or the rtx for the pseudo reg the value of X was copied into.
2570 OTHER must be valid as a SET_DEST. */
2573 make_safe_from (x, other)
2577 switch (GET_CODE (other))
2580 other = SUBREG_REG (other);
2582 case STRICT_LOW_PART:
2585 other = XEXP (other, 0);
2591 if ((GET_CODE (other) == MEM
2593 && GET_CODE (x) != REG
2594 && GET_CODE (x) != SUBREG)
2595 || (GET_CODE (other) == REG
2596 && (REGNO (other) < FIRST_PSEUDO_REGISTER
2597 || reg_mentioned_p (other, x))))
2599 rtx temp = gen_reg_rtx (GET_MODE (x));
2600 emit_move_insn (temp, x);
2606 /* Emission of insns (adding them to the doubly-linked list). */
2608 /* Return the first insn of the current sequence or current function. */
2616 /* Return the last insn emitted in current sequence or current function. */
2624 /* Specify a new insn as the last in the chain. */
2627 set_last_insn (insn)
2630 if (NEXT_INSN (insn) != 0)
2635 /* Return the last insn emitted, even if it is in a sequence now pushed. */
2638 get_last_insn_anywhere ()
2640 struct sequence_stack *stack;
2643 for (stack = seq_stack; stack; stack = stack->next)
2644 if (stack->last != 0)
2649 /* Return a number larger than any instruction's uid in this function. */
2654 return cur_insn_uid;
2657 /* Renumber instructions so that no instruction UIDs are wasted. */
2660 renumber_insns (stream)
2665 /* If we're not supposed to renumber instructions, don't. */
2666 if (!flag_renumber_insns)
2669 /* If there aren't that many instructions, then it's not really
2670 worth renumbering them. */
2671 if (flag_renumber_insns == 1 && get_max_uid () < 25000)
2676 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
2679 fprintf (stream, "Renumbering insn %d to %d\n",
2680 INSN_UID (insn), cur_insn_uid);
2681 INSN_UID (insn) = cur_insn_uid++;
2685 /* Return the next insn. If it is a SEQUENCE, return the first insn
2694 insn = NEXT_INSN (insn);
2695 if (insn && GET_CODE (insn) == INSN
2696 && GET_CODE (PATTERN (insn)) == SEQUENCE)
2697 insn = XVECEXP (PATTERN (insn), 0, 0);
2703 /* Return the previous insn. If it is a SEQUENCE, return the last insn
2707 previous_insn (insn)
2712 insn = PREV_INSN (insn);
2713 if (insn && GET_CODE (insn) == INSN
2714 && GET_CODE (PATTERN (insn)) == SEQUENCE)
2715 insn = XVECEXP (PATTERN (insn), 0, XVECLEN (PATTERN (insn), 0) - 1);
2721 /* Return the next insn after INSN that is not a NOTE. This routine does not
2722 look inside SEQUENCEs. */
2725 next_nonnote_insn (insn)
2730 insn = NEXT_INSN (insn);
2731 if (insn == 0 || GET_CODE (insn) != NOTE)
2738 /* Return the previous insn before INSN that is not a NOTE. This routine does
2739 not look inside SEQUENCEs. */
2742 prev_nonnote_insn (insn)
2747 insn = PREV_INSN (insn);
2748 if (insn == 0 || GET_CODE (insn) != NOTE)
2755 /* Return the next INSN, CALL_INSN or JUMP_INSN after INSN;
2756 or 0, if there is none. This routine does not look inside
2760 next_real_insn (insn)
2765 insn = NEXT_INSN (insn);
2766 if (insn == 0 || GET_CODE (insn) == INSN
2767 || GET_CODE (insn) == CALL_INSN || GET_CODE (insn) == JUMP_INSN)
2774 /* Return the last INSN, CALL_INSN or JUMP_INSN before INSN;
2775 or 0, if there is none. This routine does not look inside
2779 prev_real_insn (insn)
2784 insn = PREV_INSN (insn);
2785 if (insn == 0 || GET_CODE (insn) == INSN || GET_CODE (insn) == CALL_INSN
2786 || GET_CODE (insn) == JUMP_INSN)
2793 /* Find the next insn after INSN that really does something. This routine
2794 does not look inside SEQUENCEs. Until reload has completed, this is the
2795 same as next_real_insn. */
2798 active_insn_p (insn)
2801 return (GET_CODE (insn) == CALL_INSN || GET_CODE (insn) == JUMP_INSN
2802 || (GET_CODE (insn) == INSN
2803 && (! reload_completed
2804 || (GET_CODE (PATTERN (insn)) != USE
2805 && GET_CODE (PATTERN (insn)) != CLOBBER))));
2809 next_active_insn (insn)
2814 insn = NEXT_INSN (insn);
2815 if (insn == 0 || active_insn_p (insn))
2822 /* Find the last insn before INSN that really does something. This routine
2823 does not look inside SEQUENCEs. Until reload has completed, this is the
2824 same as prev_real_insn. */
2827 prev_active_insn (insn)
2832 insn = PREV_INSN (insn);
2833 if (insn == 0 || active_insn_p (insn))
2840 /* Return the next CODE_LABEL after the insn INSN, or 0 if there is none. */
2848 insn = NEXT_INSN (insn);
2849 if (insn == 0 || GET_CODE (insn) == CODE_LABEL)
2856 /* Return the last CODE_LABEL before the insn INSN, or 0 if there is none. */
2864 insn = PREV_INSN (insn);
2865 if (insn == 0 || GET_CODE (insn) == CODE_LABEL)
2873 /* INSN uses CC0 and is being moved into a delay slot. Set up REG_CC_SETTER
2874 and REG_CC_USER notes so we can find it. */
2877 link_cc0_insns (insn)
2880 rtx user = next_nonnote_insn (insn);
2882 if (GET_CODE (user) == INSN && GET_CODE (PATTERN (user)) == SEQUENCE)
2883 user = XVECEXP (PATTERN (user), 0, 0);
2885 REG_NOTES (user) = gen_rtx_INSN_LIST (REG_CC_SETTER, insn,
2887 REG_NOTES (insn) = gen_rtx_INSN_LIST (REG_CC_USER, user, REG_NOTES (insn));
2890 /* Return the next insn that uses CC0 after INSN, which is assumed to
2891 set it. This is the inverse of prev_cc0_setter (i.e., prev_cc0_setter
2892 applied to the result of this function should yield INSN).
2894 Normally, this is simply the next insn. However, if a REG_CC_USER note
2895 is present, it contains the insn that uses CC0.
2897 Return 0 if we can't find the insn. */
2900 next_cc0_user (insn)
2903 rtx note = find_reg_note (insn, REG_CC_USER, NULL_RTX);
2906 return XEXP (note, 0);
2908 insn = next_nonnote_insn (insn);
2909 if (insn && GET_CODE (insn) == INSN && GET_CODE (PATTERN (insn)) == SEQUENCE)
2910 insn = XVECEXP (PATTERN (insn), 0, 0);
2912 if (insn && INSN_P (insn) && reg_mentioned_p (cc0_rtx, PATTERN (insn)))
2918 /* Find the insn that set CC0 for INSN. Unless INSN has a REG_CC_SETTER
2919 note, it is the previous insn. */
2922 prev_cc0_setter (insn)
2925 rtx note = find_reg_note (insn, REG_CC_SETTER, NULL_RTX);
2928 return XEXP (note, 0);
2930 insn = prev_nonnote_insn (insn);
2931 if (! sets_cc0_p (PATTERN (insn)))
2938 /* Increment the label uses for all labels present in rtx. */
2948 code = GET_CODE (x);
2949 if (code == LABEL_REF)
2950 LABEL_NUSES (XEXP (x, 0))++;
2952 fmt = GET_RTX_FORMAT (code);
2953 for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
2956 mark_label_nuses (XEXP (x, i));
2957 else if (fmt[i] == 'E')
2958 for (j = XVECLEN (x, i) - 1; j >= 0; j--)
2959 mark_label_nuses (XVECEXP (x, i, j));
2964 /* Try splitting insns that can be split for better scheduling.
2965 PAT is the pattern which might split.
2966 TRIAL is the insn providing PAT.
2967 LAST is non-zero if we should return the last insn of the sequence produced.
2969 If this routine succeeds in splitting, it returns the first or last
2970 replacement insn depending on the value of LAST. Otherwise, it
2971 returns TRIAL. If the insn to be returned can be split, it will be. */
2974 try_split (pat, trial, last)
2978 rtx before = PREV_INSN (trial);
2979 rtx after = NEXT_INSN (trial);
2980 int has_barrier = 0;
2985 if (any_condjump_p (trial)
2986 && (note = find_reg_note (trial, REG_BR_PROB, 0)))
2987 split_branch_probability = INTVAL (XEXP (note, 0));
2988 probability = split_branch_probability;
2990 seq = split_insns (pat, trial);
2992 split_branch_probability = -1;
2994 /* If we are splitting a JUMP_INSN, it might be followed by a BARRIER.
2995 We may need to handle this specially. */
2996 if (after && GET_CODE (after) == BARRIER)
2999 after = NEXT_INSN (after);
3004 /* SEQ can either be a SEQUENCE or the pattern of a single insn.
3005 The latter case will normally arise only when being done so that
3006 it, in turn, will be split (SFmode on the 29k is an example). */
3007 if (GET_CODE (seq) == SEQUENCE)
3011 /* Avoid infinite loop if any insn of the result matches
3012 the original pattern. */
3013 for (i = 0; i < XVECLEN (seq, 0); i++)
3014 if (GET_CODE (XVECEXP (seq, 0, i)) == INSN
3015 && rtx_equal_p (PATTERN (XVECEXP (seq, 0, i)), pat))
3019 for (i = XVECLEN (seq, 0) - 1; i >= 0; i--)
3020 if (GET_CODE (XVECEXP (seq, 0, i)) == JUMP_INSN)
3022 rtx insn = XVECEXP (seq, 0, i);
3023 mark_jump_label (PATTERN (insn),
3024 XVECEXP (seq, 0, i), 0);
3026 if (probability != -1
3027 && any_condjump_p (insn)
3028 && !find_reg_note (insn, REG_BR_PROB, 0))
3030 /* We can preserve the REG_BR_PROB notes only if exactly
3031 one jump is created, otherwise the machine description
3032 is responsible for this step using
3033 split_branch_probability variable. */
3037 = gen_rtx_EXPR_LIST (REG_BR_PROB,
3038 GEN_INT (probability),
3043 /* If we are splitting a CALL_INSN, look for the CALL_INSN
3044 in SEQ and copy our CALL_INSN_FUNCTION_USAGE to it. */
3045 if (GET_CODE (trial) == CALL_INSN)
3046 for (i = XVECLEN (seq, 0) - 1; i >= 0; i--)
3047 if (GET_CODE (XVECEXP (seq, 0, i)) == CALL_INSN)
3048 CALL_INSN_FUNCTION_USAGE (XVECEXP (seq, 0, i))
3049 = CALL_INSN_FUNCTION_USAGE (trial);
3051 /* Copy notes, particularly those related to the CFG. */
3052 for (note = REG_NOTES (trial); note ; note = XEXP (note, 1))
3054 switch (REG_NOTE_KIND (note))
3057 for (i = XVECLEN (seq, 0) - 1; i >= 0; i--)
3059 rtx insn = XVECEXP (seq, 0, i);
3060 if (GET_CODE (insn) == CALL_INSN
3061 || (flag_non_call_exceptions
3062 && may_trap_p (PATTERN (insn))))
3064 = gen_rtx_EXPR_LIST (REG_EH_REGION,
3072 case REG_ALWAYS_RETURN:
3073 for (i = XVECLEN (seq, 0) - 1; i >= 0; i--)
3075 rtx insn = XVECEXP (seq, 0, i);
3076 if (GET_CODE (insn) == CALL_INSN)
3078 = gen_rtx_EXPR_LIST (REG_NOTE_KIND (note),
3084 case REG_NON_LOCAL_GOTO:
3085 for (i = XVECLEN (seq, 0) - 1; i >= 0; i--)
3087 rtx insn = XVECEXP (seq, 0, i);
3088 if (GET_CODE (insn) == JUMP_INSN)
3090 = gen_rtx_EXPR_LIST (REG_NOTE_KIND (note),
3101 /* If there are LABELS inside the split insns increment the
3102 usage count so we don't delete the label. */
3103 if (GET_CODE (trial) == INSN)
3104 for (i = XVECLEN (seq, 0) - 1; i >= 0; i--)
3105 if (GET_CODE (XVECEXP (seq, 0, i)) == INSN)
3106 mark_label_nuses (PATTERN (XVECEXP (seq, 0, i)));
3108 tem = emit_insn_after (seq, trial);
3110 delete_related_insns (trial);
3112 emit_barrier_after (tem);
3114 /* Recursively call try_split for each new insn created; by the
3115 time control returns here that insn will be fully split, so
3116 set LAST and continue from the insn after the one returned.
3117 We can't use next_active_insn here since AFTER may be a note.
3118 Ignore deleted insns, which can be occur if not optimizing. */
3119 for (tem = NEXT_INSN (before); tem != after; tem = NEXT_INSN (tem))
3120 if (! INSN_DELETED_P (tem) && INSN_P (tem))
3121 tem = try_split (PATTERN (tem), tem, 1);
3123 /* Avoid infinite loop if the result matches the original pattern. */
3124 else if (rtx_equal_p (seq, pat))
3128 PATTERN (trial) = seq;
3129 INSN_CODE (trial) = -1;
3130 try_split (seq, trial, last);
3133 /* Return either the first or the last insn, depending on which was
3136 ? (after ? PREV_INSN (after) : last_insn)
3137 : NEXT_INSN (before);
3143 /* Make and return an INSN rtx, initializing all its slots.
3144 Store PATTERN in the pattern slots. */
3147 make_insn_raw (pattern)
3152 insn = rtx_alloc (INSN);
3154 INSN_UID (insn) = cur_insn_uid++;
3155 PATTERN (insn) = pattern;
3156 INSN_CODE (insn) = -1;
3157 LOG_LINKS (insn) = NULL;
3158 REG_NOTES (insn) = NULL;
3160 #ifdef ENABLE_RTL_CHECKING
3163 && (returnjump_p (insn)
3164 || (GET_CODE (insn) == SET
3165 && SET_DEST (insn) == pc_rtx)))
3167 warning ("ICE: emit_insn used where emit_jump_insn needed:\n");
3175 /* Like `make_insn' but make a JUMP_INSN instead of an insn. */
3178 make_jump_insn_raw (pattern)
3183 insn = rtx_alloc (JUMP_INSN);
3184 INSN_UID (insn) = cur_insn_uid++;
3186 PATTERN (insn) = pattern;
3187 INSN_CODE (insn) = -1;
3188 LOG_LINKS (insn) = NULL;
3189 REG_NOTES (insn) = NULL;
3190 JUMP_LABEL (insn) = NULL;
3195 /* Like `make_insn' but make a CALL_INSN instead of an insn. */
3198 make_call_insn_raw (pattern)
3203 insn = rtx_alloc (CALL_INSN);
3204 INSN_UID (insn) = cur_insn_uid++;
3206 PATTERN (insn) = pattern;
3207 INSN_CODE (insn) = -1;
3208 LOG_LINKS (insn) = NULL;
3209 REG_NOTES (insn) = NULL;
3210 CALL_INSN_FUNCTION_USAGE (insn) = NULL;
3215 /* Add INSN to the end of the doubly-linked list.
3216 INSN may be an INSN, JUMP_INSN, CALL_INSN, CODE_LABEL, BARRIER or NOTE. */
3222 PREV_INSN (insn) = last_insn;
3223 NEXT_INSN (insn) = 0;
3225 if (NULL != last_insn)
3226 NEXT_INSN (last_insn) = insn;
3228 if (NULL == first_insn)
3234 /* Add INSN into the doubly-linked list after insn AFTER. This and
3235 the next should be the only functions called to insert an insn once
3236 delay slots have been filled since only they know how to update a
3240 add_insn_after (insn, after)
3243 rtx next = NEXT_INSN (after);
3246 if (optimize && INSN_DELETED_P (after))
3249 NEXT_INSN (insn) = next;
3250 PREV_INSN (insn) = after;
3254 PREV_INSN (next) = insn;
3255 if (GET_CODE (next) == INSN && GET_CODE (PATTERN (next)) == SEQUENCE)
3256 PREV_INSN (XVECEXP (PATTERN (next), 0, 0)) = insn;
3258 else if (last_insn == after)
3262 struct sequence_stack *stack = seq_stack;
3263 /* Scan all pending sequences too. */
3264 for (; stack; stack = stack->next)
3265 if (after == stack->last)
3275 if (basic_block_for_insn
3276 && (unsigned int)INSN_UID (after) < basic_block_for_insn->num_elements
3277 && (bb = BLOCK_FOR_INSN (after)))
3279 set_block_for_insn (insn, bb);
3281 bb->flags |= BB_DIRTY;
3282 /* Should not happen as first in the BB is always
3283 either NOTE or LABEL. */
3284 if (bb->end == after
3285 /* Avoid clobbering of structure when creating new BB. */
3286 && GET_CODE (insn) != BARRIER
3287 && (GET_CODE (insn) != NOTE
3288 || NOTE_LINE_NUMBER (insn) != NOTE_INSN_BASIC_BLOCK))
3292 NEXT_INSN (after) = insn;
3293 if (GET_CODE (after) == INSN && GET_CODE (PATTERN (after)) == SEQUENCE)
3295 rtx sequence = PATTERN (after);
3296 NEXT_INSN (XVECEXP (sequence, 0, XVECLEN (sequence, 0) - 1)) = insn;
3300 /* Add INSN into the doubly-linked list before insn BEFORE. This and
3301 the previous should be the only functions called to insert an insn once
3302 delay slots have been filled since only they know how to update a
3306 add_insn_before (insn, before)
3309 rtx prev = PREV_INSN (before);
3312 if (optimize && INSN_DELETED_P (before))
3315 PREV_INSN (insn) = prev;
3316 NEXT_INSN (insn) = before;
3320 NEXT_INSN (prev) = insn;
3321 if (GET_CODE (prev) == INSN && GET_CODE (PATTERN (prev)) == SEQUENCE)
3323 rtx sequence = PATTERN (prev);
3324 NEXT_INSN (XVECEXP (sequence, 0, XVECLEN (sequence, 0) - 1)) = insn;
3327 else if (first_insn == before)
3331 struct sequence_stack *stack = seq_stack;
3332 /* Scan all pending sequences too. */
3333 for (; stack; stack = stack->next)
3334 if (before == stack->first)
3336 stack->first = insn;
3344 if (basic_block_for_insn
3345 && (unsigned int)INSN_UID (before) < basic_block_for_insn->num_elements
3346 && (bb = BLOCK_FOR_INSN (before)))
3348 set_block_for_insn (insn, bb);
3350 bb->flags |= BB_DIRTY;
3351 /* Should not happen as first in the BB is always
3352 either NOTE or LABEl. */
3353 if (bb->head == insn
3354 /* Avoid clobbering of structure when creating new BB. */
3355 && GET_CODE (insn) != BARRIER
3356 && (GET_CODE (insn) != NOTE
3357 || NOTE_LINE_NUMBER (insn) != NOTE_INSN_BASIC_BLOCK))
3361 PREV_INSN (before) = insn;
3362 if (GET_CODE (before) == INSN && GET_CODE (PATTERN (before)) == SEQUENCE)
3363 PREV_INSN (XVECEXP (PATTERN (before), 0, 0)) = insn;
3366 /* Remove an insn from its doubly-linked list. This function knows how
3367 to handle sequences. */
3372 rtx next = NEXT_INSN (insn);
3373 rtx prev = PREV_INSN (insn);
3378 NEXT_INSN (prev) = next;
3379 if (GET_CODE (prev) == INSN && GET_CODE (PATTERN (prev)) == SEQUENCE)
3381 rtx sequence = PATTERN (prev);
3382 NEXT_INSN (XVECEXP (sequence, 0, XVECLEN (sequence, 0) - 1)) = next;
3385 else if (first_insn == insn)
3389 struct sequence_stack *stack = seq_stack;
3390 /* Scan all pending sequences too. */
3391 for (; stack; stack = stack->next)
3392 if (insn == stack->first)
3394 stack->first = next;
3404 PREV_INSN (next) = prev;
3405 if (GET_CODE (next) == INSN && GET_CODE (PATTERN (next)) == SEQUENCE)
3406 PREV_INSN (XVECEXP (PATTERN (next), 0, 0)) = prev;
3408 else if (last_insn == insn)
3412 struct sequence_stack *stack = seq_stack;
3413 /* Scan all pending sequences too. */
3414 for (; stack; stack = stack->next)
3415 if (insn == stack->last)
3424 if (basic_block_for_insn
3425 && (unsigned int)INSN_UID (insn) < basic_block_for_insn->num_elements
3426 && (bb = BLOCK_FOR_INSN (insn)))
3429 bb->flags |= BB_DIRTY;
3430 if (bb->head == insn)
3432 /* Never ever delete the basic block note without deleting whole basic
3434 if (GET_CODE (insn) == NOTE)
3438 if (bb->end == insn)
3443 /* Delete all insns made since FROM.
3444 FROM becomes the new last instruction. */
3447 delete_insns_since (from)
3453 NEXT_INSN (from) = 0;
3457 /* This function is deprecated, please use sequences instead.
3459 Move a consecutive bunch of insns to a different place in the chain.
3460 The insns to be moved are those between FROM and TO.
3461 They are moved to a new position after the insn AFTER.
3462 AFTER must not be FROM or TO or any insn in between.
3464 This function does not know about SEQUENCEs and hence should not be
3465 called after delay-slot filling has been done. */
3468 reorder_insns_nobb (from, to, after)
3469 rtx from, to, after;
3471 /* Splice this bunch out of where it is now. */
3472 if (PREV_INSN (from))
3473 NEXT_INSN (PREV_INSN (from)) = NEXT_INSN (to);
3475 PREV_INSN (NEXT_INSN (to)) = PREV_INSN (from);
3476 if (last_insn == to)
3477 last_insn = PREV_INSN (from);
3478 if (first_insn == from)
3479 first_insn = NEXT_INSN (to);
3481 /* Make the new neighbors point to it and it to them. */
3482 if (NEXT_INSN (after))
3483 PREV_INSN (NEXT_INSN (after)) = to;
3485 NEXT_INSN (to) = NEXT_INSN (after);
3486 PREV_INSN (from) = after;
3487 NEXT_INSN (after) = from;
3488 if (after == last_insn)
3492 /* Same as function above, but take care to update BB boundaries. */
3494 reorder_insns (from, to, after)
3495 rtx from, to, after;
3497 rtx prev = PREV_INSN (from);
3498 basic_block bb, bb2;
3500 reorder_insns_nobb (from, to, after);
3502 if (basic_block_for_insn
3503 && (unsigned int)INSN_UID (after) < basic_block_for_insn->num_elements
3504 && (bb = BLOCK_FOR_INSN (after)))
3507 bb->flags |= BB_DIRTY;
3509 if (basic_block_for_insn
3510 && (unsigned int)INSN_UID (from) < basic_block_for_insn->num_elements
3511 && (bb2 = BLOCK_FOR_INSN (from)))
3515 bb2->flags |= BB_DIRTY;
3518 if (bb->end == after)
3521 for (x = from; x != NEXT_INSN (to); x = NEXT_INSN (x))
3522 set_block_for_insn (x, bb);
3526 /* Return the line note insn preceding INSN. */
3529 find_line_note (insn)
3532 if (no_line_numbers)
3535 for (; insn; insn = PREV_INSN (insn))
3536 if (GET_CODE (insn) == NOTE
3537 && NOTE_LINE_NUMBER (insn) >= 0)
3543 /* Like reorder_insns, but inserts line notes to preserve the line numbers
3544 of the moved insns when debugging. This may insert a note between AFTER
3545 and FROM, and another one after TO. */
3548 reorder_insns_with_line_notes (from, to, after)
3549 rtx from, to, after;
3551 rtx from_line = find_line_note (from);
3552 rtx after_line = find_line_note (after);
3554 reorder_insns (from, to, after);
3556 if (from_line == after_line)
3560 emit_line_note_after (NOTE_SOURCE_FILE (from_line),
3561 NOTE_LINE_NUMBER (from_line),
3564 emit_line_note_after (NOTE_SOURCE_FILE (after_line),
3565 NOTE_LINE_NUMBER (after_line),
3569 /* Remove unnecessary notes from the instruction stream. */
3572 remove_unnecessary_notes ()
3574 rtx block_stack = NULL_RTX;
3575 rtx eh_stack = NULL_RTX;
3580 /* We must not remove the first instruction in the function because
3581 the compiler depends on the first instruction being a note. */
3582 for (insn = NEXT_INSN (get_insns ()); insn; insn = next)
3584 /* Remember what's next. */
3585 next = NEXT_INSN (insn);
3587 /* We're only interested in notes. */
3588 if (GET_CODE (insn) != NOTE)
3591 switch (NOTE_LINE_NUMBER (insn))
3593 case NOTE_INSN_DELETED:
3594 case NOTE_INSN_LOOP_END_TOP_COND:
3598 case NOTE_INSN_EH_REGION_BEG:
3599 eh_stack = alloc_INSN_LIST (insn, eh_stack);
3602 case NOTE_INSN_EH_REGION_END:
3603 /* Too many end notes. */
3604 if (eh_stack == NULL_RTX)
3606 /* Mismatched nesting. */
3607 if (NOTE_EH_HANDLER (XEXP (eh_stack, 0)) != NOTE_EH_HANDLER (insn))
3610 eh_stack = XEXP (eh_stack, 1);
3611 free_INSN_LIST_node (tmp);
3614 case NOTE_INSN_BLOCK_BEG:
3615 /* By now, all notes indicating lexical blocks should have
3616 NOTE_BLOCK filled in. */
3617 if (NOTE_BLOCK (insn) == NULL_TREE)
3619 block_stack = alloc_INSN_LIST (insn, block_stack);
3622 case NOTE_INSN_BLOCK_END:
3623 /* Too many end notes. */
3624 if (block_stack == NULL_RTX)
3626 /* Mismatched nesting. */
3627 if (NOTE_BLOCK (XEXP (block_stack, 0)) != NOTE_BLOCK (insn))
3630 block_stack = XEXP (block_stack, 1);
3631 free_INSN_LIST_node (tmp);
3633 /* Scan back to see if there are any non-note instructions
3634 between INSN and the beginning of this block. If not,
3635 then there is no PC range in the generated code that will
3636 actually be in this block, so there's no point in
3637 remembering the existence of the block. */
3638 for (tmp = PREV_INSN (insn); tmp ; tmp = PREV_INSN (tmp))
3640 /* This block contains a real instruction. Note that we
3641 don't include labels; if the only thing in the block
3642 is a label, then there are still no PC values that
3643 lie within the block. */
3647 /* We're only interested in NOTEs. */
3648 if (GET_CODE (tmp) != NOTE)
3651 if (NOTE_LINE_NUMBER (tmp) == NOTE_INSN_BLOCK_BEG)
3653 /* We just verified that this BLOCK matches us with
3654 the block_stack check above. Never delete the
3655 BLOCK for the outermost scope of the function; we
3656 can refer to names from that scope even if the
3657 block notes are messed up. */
3658 if (! is_body_block (NOTE_BLOCK (insn))
3659 && (*debug_hooks->ignore_block) (NOTE_BLOCK (insn)))
3666 else if (NOTE_LINE_NUMBER (tmp) == NOTE_INSN_BLOCK_END)
3667 /* There's a nested block. We need to leave the
3668 current block in place since otherwise the debugger
3669 wouldn't be able to show symbols from our block in
3670 the nested block. */
3676 /* Too many begin notes. */
3677 if (block_stack || eh_stack)
3682 /* Emit an insn of given code and pattern
3683 at a specified place within the doubly-linked list. */
3685 /* Make an instruction with body PATTERN
3686 and output it before the instruction BEFORE. */
3689 emit_insn_before (pattern, before)
3690 rtx pattern, before;
3694 if (GET_CODE (pattern) == SEQUENCE)
3698 for (i = 0; i < XVECLEN (pattern, 0); i++)
3700 insn = XVECEXP (pattern, 0, i);
3701 add_insn_before (insn, before);
3706 insn = make_insn_raw (pattern);
3707 add_insn_before (insn, before);
3713 /* Make an instruction with body PATTERN and code JUMP_INSN
3714 and output it before the instruction BEFORE. */
3717 emit_jump_insn_before (pattern, before)
3718 rtx pattern, before;
3722 if (GET_CODE (pattern) == SEQUENCE)
3723 insn = emit_insn_before (pattern, before);
3726 insn = make_jump_insn_raw (pattern);
3727 add_insn_before (insn, before);
3733 /* Make an instruction with body PATTERN and code CALL_INSN
3734 and output it before the instruction BEFORE. */
3737 emit_call_insn_before (pattern, before)
3738 rtx pattern, before;
3742 if (GET_CODE (pattern) == SEQUENCE)
3743 insn = emit_insn_before (pattern, before);
3746 insn = make_call_insn_raw (pattern);
3747 add_insn_before (insn, before);
3748 PUT_CODE (insn, CALL_INSN);
3754 /* Make an insn of code BARRIER
3755 and output it before the insn BEFORE. */
3758 emit_barrier_before (before)
3761 rtx insn = rtx_alloc (BARRIER);
3763 INSN_UID (insn) = cur_insn_uid++;
3765 add_insn_before (insn, before);
3769 /* Emit the label LABEL before the insn BEFORE. */
3772 emit_label_before (label, before)
3775 /* This can be called twice for the same label as a result of the
3776 confusion that follows a syntax error! So make it harmless. */
3777 if (INSN_UID (label) == 0)
3779 INSN_UID (label) = cur_insn_uid++;
3780 add_insn_before (label, before);
3786 /* Emit a note of subtype SUBTYPE before the insn BEFORE. */
3789 emit_note_before (subtype, before)
3793 rtx note = rtx_alloc (NOTE);
3794 INSN_UID (note) = cur_insn_uid++;
3795 NOTE_SOURCE_FILE (note) = 0;
3796 NOTE_LINE_NUMBER (note) = subtype;
3798 add_insn_before (note, before);
3802 /* Make an insn of code INSN with body PATTERN
3803 and output it after the insn AFTER. */
3806 emit_insn_after (pattern, after)
3811 if (GET_CODE (pattern) == SEQUENCE)
3815 for (i = 0; i < XVECLEN (pattern, 0); i++)
3817 insn = XVECEXP (pattern, 0, i);
3818 add_insn_after (insn, after);
3824 insn = make_insn_raw (pattern);
3825 add_insn_after (insn, after);
3831 /* Similar to emit_insn_after, except that line notes are to be inserted so
3832 as to act as if this insn were at FROM. */
3835 emit_insn_after_with_line_notes (pattern, after, from)
3836 rtx pattern, after, from;
3838 rtx from_line = find_line_note (from);
3839 rtx after_line = find_line_note (after);
3840 rtx insn = emit_insn_after (pattern, after);
3843 emit_line_note_after (NOTE_SOURCE_FILE (from_line),
3844 NOTE_LINE_NUMBER (from_line),
3848 emit_line_note_after (NOTE_SOURCE_FILE (after_line),
3849 NOTE_LINE_NUMBER (after_line),
3853 /* Make an insn of code JUMP_INSN with body PATTERN
3854 and output it after the insn AFTER. */
3857 emit_jump_insn_after (pattern, after)
3862 if (GET_CODE (pattern) == SEQUENCE)
3863 insn = emit_insn_after (pattern, after);
3866 insn = make_jump_insn_raw (pattern);
3867 add_insn_after (insn, after);
3873 /* Make an insn of code BARRIER
3874 and output it after the insn AFTER. */
3877 emit_barrier_after (after)
3880 rtx insn = rtx_alloc (BARRIER);
3882 INSN_UID (insn) = cur_insn_uid++;
3884 add_insn_after (insn, after);
3888 /* Emit the label LABEL after the insn AFTER. */
3891 emit_label_after (label, after)
3894 /* This can be called twice for the same label
3895 as a result of the confusion that follows a syntax error!
3896 So make it harmless. */
3897 if (INSN_UID (label) == 0)
3899 INSN_UID (label) = cur_insn_uid++;
3900 add_insn_after (label, after);
3906 /* Emit a note of subtype SUBTYPE after the insn AFTER. */
3909 emit_note_after (subtype, after)
3913 rtx note = rtx_alloc (NOTE);
3914 INSN_UID (note) = cur_insn_uid++;
3915 NOTE_SOURCE_FILE (note) = 0;
3916 NOTE_LINE_NUMBER (note) = subtype;
3917 add_insn_after (note, after);
3921 /* Emit a line note for FILE and LINE after the insn AFTER. */
3924 emit_line_note_after (file, line, after)
3931 if (no_line_numbers && line > 0)
3937 note = rtx_alloc (NOTE);
3938 INSN_UID (note) = cur_insn_uid++;
3939 NOTE_SOURCE_FILE (note) = file;
3940 NOTE_LINE_NUMBER (note) = line;
3941 add_insn_after (note, after);
3945 /* Make an insn of code INSN with pattern PATTERN
3946 and add it to the end of the doubly-linked list.
3947 If PATTERN is a SEQUENCE, take the elements of it
3948 and emit an insn for each element.
3950 Returns the last insn emitted. */
3956 rtx insn = last_insn;
3958 if (GET_CODE (pattern) == SEQUENCE)
3962 for (i = 0; i < XVECLEN (pattern, 0); i++)
3964 insn = XVECEXP (pattern, 0, i);
3970 insn = make_insn_raw (pattern);
3977 /* Emit the insns in a chain starting with INSN.
3978 Return the last insn emitted. */
3988 rtx next = NEXT_INSN (insn);
3997 /* Emit the insns in a chain starting with INSN and place them in front of
3998 the insn BEFORE. Return the last insn emitted. */
4001 emit_insns_before (insn, before)
4009 rtx next = NEXT_INSN (insn);
4010 add_insn_before (insn, before);
4018 /* Emit the insns in a chain starting with FIRST and place them in back of
4019 the insn AFTER. Return the last insn emitted. */
4022 emit_insns_after (first, after)
4036 if (basic_block_for_insn
4037 && (unsigned int)INSN_UID (after) < basic_block_for_insn->num_elements
4038 && (bb = BLOCK_FOR_INSN (after)))
4040 bb->flags |= BB_DIRTY;
4041 for (last = first; NEXT_INSN (last); last = NEXT_INSN (last))
4042 set_block_for_insn (last, bb);
4043 set_block_for_insn (last, bb);
4044 if (bb->end == after)
4048 for (last = first; NEXT_INSN (last); last = NEXT_INSN (last))
4051 after_after = NEXT_INSN (after);
4053 NEXT_INSN (after) = first;
4054 PREV_INSN (first) = after;
4055 NEXT_INSN (last) = after_after;
4057 PREV_INSN (after_after) = last;
4059 if (after == last_insn)
4064 /* Make an insn of code JUMP_INSN with pattern PATTERN
4065 and add it to the end of the doubly-linked list. */
4068 emit_jump_insn (pattern)
4071 if (GET_CODE (pattern) == SEQUENCE)
4072 return emit_insn (pattern);
4075 rtx insn = make_jump_insn_raw (pattern);
4081 /* Make an insn of code CALL_INSN with pattern PATTERN
4082 and add it to the end of the doubly-linked list. */
4085 emit_call_insn (pattern)
4088 if (GET_CODE (pattern) == SEQUENCE)
4089 return emit_insn (pattern);
4092 rtx insn = make_call_insn_raw (pattern);
4094 PUT_CODE (insn, CALL_INSN);
4099 /* Add the label LABEL to the end of the doubly-linked list. */
4105 /* This can be called twice for the same label
4106 as a result of the confusion that follows a syntax error!
4107 So make it harmless. */
4108 if (INSN_UID (label) == 0)
4110 INSN_UID (label) = cur_insn_uid++;
4116 /* Make an insn of code BARRIER
4117 and add it to the end of the doubly-linked list. */
4122 rtx barrier = rtx_alloc (BARRIER);
4123 INSN_UID (barrier) = cur_insn_uid++;
4128 /* Make an insn of code NOTE
4129 with data-fields specified by FILE and LINE
4130 and add it to the end of the doubly-linked list,
4131 but only if line-numbers are desired for debugging info. */
4134 emit_line_note (file, line)
4138 set_file_and_line_for_stmt (file, line);
4141 if (no_line_numbers)
4145 return emit_note (file, line);
4148 /* Make an insn of code NOTE
4149 with data-fields specified by FILE and LINE
4150 and add it to the end of the doubly-linked list.
4151 If it is a line-number NOTE, omit it if it matches the previous one. */
4154 emit_note (file, line)
4162 if (file && last_filename && !strcmp (file, last_filename)
4163 && line == last_linenum)
4165 last_filename = file;
4166 last_linenum = line;
4169 if (no_line_numbers && line > 0)
4175 note = rtx_alloc (NOTE);
4176 INSN_UID (note) = cur_insn_uid++;
4177 NOTE_SOURCE_FILE (note) = file;
4178 NOTE_LINE_NUMBER (note) = line;
4183 /* Emit a NOTE, and don't omit it even if LINE is the previous note. */
4186 emit_line_note_force (file, line)
4191 return emit_line_note (file, line);
4194 /* Cause next statement to emit a line note even if the line number
4195 has not changed. This is used at the beginning of a function. */
4198 force_next_line_note ()
4203 /* Place a note of KIND on insn INSN with DATUM as the datum. If a
4204 note of this type already exists, remove it first. */
4207 set_unique_reg_note (insn, kind, datum)
4212 rtx note = find_reg_note (insn, kind, NULL_RTX);
4218 /* Don't add REG_EQUAL/REG_EQUIV notes if the insn
4219 has multiple sets (some callers assume single_set
4220 means the insn only has one set, when in fact it
4221 means the insn only has one * useful * set). */
4222 if (GET_CODE (PATTERN (insn)) == PARALLEL && multiple_sets (insn))
4229 /* Don't add ASM_OPERAND REG_EQUAL/REG_EQUIV notes.
4230 It serves no useful purpose and breaks eliminate_regs. */
4231 if (GET_CODE (datum) == ASM_OPERANDS)
4241 XEXP (note, 0) = datum;
4245 REG_NOTES (insn) = gen_rtx_EXPR_LIST (kind, datum, REG_NOTES (insn));
4246 return REG_NOTES (insn);
4249 /* Return an indication of which type of insn should have X as a body.
4250 The value is CODE_LABEL, INSN, CALL_INSN or JUMP_INSN. */
4256 if (GET_CODE (x) == CODE_LABEL)
4258 if (GET_CODE (x) == CALL)
4260 if (GET_CODE (x) == RETURN)
4262 if (GET_CODE (x) == SET)
4264 if (SET_DEST (x) == pc_rtx)
4266 else if (GET_CODE (SET_SRC (x)) == CALL)
4271 if (GET_CODE (x) == PARALLEL)
4274 for (j = XVECLEN (x, 0) - 1; j >= 0; j--)
4275 if (GET_CODE (XVECEXP (x, 0, j)) == CALL)
4277 else if (GET_CODE (XVECEXP (x, 0, j)) == SET
4278 && SET_DEST (XVECEXP (x, 0, j)) == pc_rtx)
4280 else if (GET_CODE (XVECEXP (x, 0, j)) == SET
4281 && GET_CODE (SET_SRC (XVECEXP (x, 0, j))) == CALL)
4287 /* Emit the rtl pattern X as an appropriate kind of insn.
4288 If X is a label, it is simply added into the insn chain. */
4294 enum rtx_code code = classify_insn (x);
4296 if (code == CODE_LABEL)
4297 return emit_label (x);
4298 else if (code == INSN)
4299 return emit_insn (x);
4300 else if (code == JUMP_INSN)
4302 rtx insn = emit_jump_insn (x);
4303 if (any_uncondjump_p (insn) || GET_CODE (x) == RETURN)
4304 return emit_barrier ();
4307 else if (code == CALL_INSN)
4308 return emit_call_insn (x);
4313 /* Begin emitting insns to a sequence which can be packaged in an
4314 RTL_EXPR. If this sequence will contain something that might cause
4315 the compiler to pop arguments to function calls (because those
4316 pops have previously been deferred; see INHIBIT_DEFER_POP for more
4317 details), use do_pending_stack_adjust before calling this function.
4318 That will ensure that the deferred pops are not accidentally
4319 emitted in the middle of this sequence. */
4324 struct sequence_stack *tem;
4326 tem = (struct sequence_stack *) xmalloc (sizeof (struct sequence_stack));
4328 tem->next = seq_stack;
4329 tem->first = first_insn;
4330 tem->last = last_insn;
4331 tem->sequence_rtl_expr = seq_rtl_expr;
4339 /* Similarly, but indicate that this sequence will be placed in T, an
4340 RTL_EXPR. See the documentation for start_sequence for more
4341 information about how to use this function. */
4344 start_sequence_for_rtl_expr (t)
4352 /* Set up the insn chain starting with FIRST as the current sequence,
4353 saving the previously current one. See the documentation for
4354 start_sequence for more information about how to use this function. */
4357 push_to_sequence (first)
4364 for (last = first; last && NEXT_INSN (last); last = NEXT_INSN (last));
4370 /* Set up the insn chain from a chain stort in FIRST to LAST. */
4373 push_to_full_sequence (first, last)
4379 /* We really should have the end of the insn chain here. */
4380 if (last && NEXT_INSN (last))
4384 /* Set up the outer-level insn chain
4385 as the current sequence, saving the previously current one. */
4388 push_topmost_sequence ()
4390 struct sequence_stack *stack, *top = NULL;
4394 for (stack = seq_stack; stack; stack = stack->next)
4397 first_insn = top->first;
4398 last_insn = top->last;
4399 seq_rtl_expr = top->sequence_rtl_expr;
4402 /* After emitting to the outer-level insn chain, update the outer-level
4403 insn chain, and restore the previous saved state. */
4406 pop_topmost_sequence ()
4408 struct sequence_stack *stack, *top = NULL;
4410 for (stack = seq_stack; stack; stack = stack->next)
4413 top->first = first_insn;
4414 top->last = last_insn;
4415 /* ??? Why don't we save seq_rtl_expr here? */
4420 /* After emitting to a sequence, restore previous saved state.
4422 To get the contents of the sequence just made, you must call
4423 `gen_sequence' *before* calling here.
4425 If the compiler might have deferred popping arguments while
4426 generating this sequence, and this sequence will not be immediately
4427 inserted into the instruction stream, use do_pending_stack_adjust
4428 before calling gen_sequence. That will ensure that the deferred
4429 pops are inserted into this sequence, and not into some random
4430 location in the instruction stream. See INHIBIT_DEFER_POP for more
4431 information about deferred popping of arguments. */
4436 struct sequence_stack *tem = seq_stack;
4438 first_insn = tem->first;
4439 last_insn = tem->last;
4440 seq_rtl_expr = tem->sequence_rtl_expr;
4441 seq_stack = tem->next;
4446 /* This works like end_sequence, but records the old sequence in FIRST
4450 end_full_sequence (first, last)
4453 *first = first_insn;
4458 /* Return 1 if currently emitting into a sequence. */
4463 return seq_stack != 0;
4466 /* Generate a SEQUENCE rtx containing the insns already emitted
4467 to the current sequence.
4469 This is how the gen_... function from a DEFINE_EXPAND
4470 constructs the SEQUENCE that it returns. */
4480 /* Count the insns in the chain. */
4482 for (tem = first_insn; tem; tem = NEXT_INSN (tem))
4485 /* If only one insn, return it rather than a SEQUENCE.
4486 (Now that we cache SEQUENCE expressions, it isn't worth special-casing
4487 the case of an empty list.)
4488 We only return the pattern of an insn if its code is INSN and it
4489 has no notes. This ensures that no information gets lost. */
4491 && ! RTX_FRAME_RELATED_P (first_insn)
4492 && GET_CODE (first_insn) == INSN
4493 /* Don't throw away any reg notes. */
4494 && REG_NOTES (first_insn) == 0)
4495 return PATTERN (first_insn);
4497 result = gen_rtx_SEQUENCE (VOIDmode, rtvec_alloc (len));
4499 for (i = 0, tem = first_insn; tem; tem = NEXT_INSN (tem), i++)
4500 XVECEXP (result, 0, i) = tem;
4505 /* Put the various virtual registers into REGNO_REG_RTX. */
4508 init_virtual_regs (es)
4509 struct emit_status *es;
4511 rtx *ptr = es->x_regno_reg_rtx;
4512 ptr[VIRTUAL_INCOMING_ARGS_REGNUM] = virtual_incoming_args_rtx;
4513 ptr[VIRTUAL_STACK_VARS_REGNUM] = virtual_stack_vars_rtx;
4514 ptr[VIRTUAL_STACK_DYNAMIC_REGNUM] = virtual_stack_dynamic_rtx;
4515 ptr[VIRTUAL_OUTGOING_ARGS_REGNUM] = virtual_outgoing_args_rtx;
4516 ptr[VIRTUAL_CFA_REGNUM] = virtual_cfa_rtx;
4520 clear_emit_caches ()
4524 /* Clear the start_sequence/gen_sequence cache. */
4525 for (i = 0; i < SEQUENCE_RESULT_SIZE; i++)
4526 sequence_result[i] = 0;
4530 /* Used by copy_insn_1 to avoid copying SCRATCHes more than once. */
4531 static rtx copy_insn_scratch_in[MAX_RECOG_OPERANDS];
4532 static rtx copy_insn_scratch_out[MAX_RECOG_OPERANDS];
4533 static int copy_insn_n_scratches;
4535 /* When an insn is being copied by copy_insn_1, this is nonzero if we have
4536 copied an ASM_OPERANDS.
4537 In that case, it is the original input-operand vector. */
4538 static rtvec orig_asm_operands_vector;
4540 /* When an insn is being copied by copy_insn_1, this is nonzero if we have
4541 copied an ASM_OPERANDS.
4542 In that case, it is the copied input-operand vector. */
4543 static rtvec copy_asm_operands_vector;
4545 /* Likewise for the constraints vector. */
4546 static rtvec orig_asm_constraints_vector;
4547 static rtvec copy_asm_constraints_vector;
4549 /* Recursively create a new copy of an rtx for copy_insn.
4550 This function differs from copy_rtx in that it handles SCRATCHes and
4551 ASM_OPERANDs properly.
4552 Normally, this function is not used directly; use copy_insn as front end.
4553 However, you could first copy an insn pattern with copy_insn and then use
4554 this function afterwards to properly copy any REG_NOTEs containing
4564 const char *format_ptr;
4566 code = GET_CODE (orig);
4583 for (i = 0; i < copy_insn_n_scratches; i++)
4584 if (copy_insn_scratch_in[i] == orig)
4585 return copy_insn_scratch_out[i];
4589 /* CONST can be shared if it contains a SYMBOL_REF. If it contains
4590 a LABEL_REF, it isn't sharable. */
4591 if (GET_CODE (XEXP (orig, 0)) == PLUS
4592 && GET_CODE (XEXP (XEXP (orig, 0), 0)) == SYMBOL_REF
4593 && GET_CODE (XEXP (XEXP (orig, 0), 1)) == CONST_INT)
4597 /* A MEM with a constant address is not sharable. The problem is that
4598 the constant address may need to be reloaded. If the mem is shared,
4599 then reloading one copy of this mem will cause all copies to appear
4600 to have been reloaded. */
4606 copy = rtx_alloc (code);
4608 /* Copy the various flags, and other information. We assume that
4609 all fields need copying, and then clear the fields that should
4610 not be copied. That is the sensible default behavior, and forces
4611 us to explicitly document why we are *not* copying a flag. */
4612 memcpy (copy, orig, sizeof (struct rtx_def) - sizeof (rtunion));
4614 /* We do not copy the USED flag, which is used as a mark bit during
4615 walks over the RTL. */
4618 /* We do not copy JUMP, CALL, or FRAME_RELATED for INSNs. */
4619 if (GET_RTX_CLASS (code) == 'i')
4623 copy->frame_related = 0;
4626 format_ptr = GET_RTX_FORMAT (GET_CODE (copy));
4628 for (i = 0; i < GET_RTX_LENGTH (GET_CODE (copy)); i++)
4630 copy->fld[i] = orig->fld[i];
4631 switch (*format_ptr++)
4634 if (XEXP (orig, i) != NULL)
4635 XEXP (copy, i) = copy_insn_1 (XEXP (orig, i));
4640 if (XVEC (orig, i) == orig_asm_constraints_vector)
4641 XVEC (copy, i) = copy_asm_constraints_vector;
4642 else if (XVEC (orig, i) == orig_asm_operands_vector)
4643 XVEC (copy, i) = copy_asm_operands_vector;
4644 else if (XVEC (orig, i) != NULL)
4646 XVEC (copy, i) = rtvec_alloc (XVECLEN (orig, i));
4647 for (j = 0; j < XVECLEN (copy, i); j++)
4648 XVECEXP (copy, i, j) = copy_insn_1 (XVECEXP (orig, i, j));
4659 /* These are left unchanged. */
4667 if (code == SCRATCH)
4669 i = copy_insn_n_scratches++;
4670 if (i >= MAX_RECOG_OPERANDS)
4672 copy_insn_scratch_in[i] = orig;
4673 copy_insn_scratch_out[i] = copy;
4675 else if (code == ASM_OPERANDS)
4677 orig_asm_operands_vector = ASM_OPERANDS_INPUT_VEC (orig);
4678 copy_asm_operands_vector = ASM_OPERANDS_INPUT_VEC (copy);
4679 orig_asm_constraints_vector = ASM_OPERANDS_INPUT_CONSTRAINT_VEC (orig);
4680 copy_asm_constraints_vector = ASM_OPERANDS_INPUT_CONSTRAINT_VEC (copy);
4686 /* Create a new copy of an rtx.
4687 This function differs from copy_rtx in that it handles SCRATCHes and
4688 ASM_OPERANDs properly.
4689 INSN doesn't really have to be a full INSN; it could be just the
4695 copy_insn_n_scratches = 0;
4696 orig_asm_operands_vector = 0;
4697 orig_asm_constraints_vector = 0;
4698 copy_asm_operands_vector = 0;
4699 copy_asm_constraints_vector = 0;
4700 return copy_insn_1 (insn);
4703 /* Initialize data structures and variables in this file
4704 before generating rtl for each function. */
4709 struct function *f = cfun;
4711 f->emit = (struct emit_status *) xmalloc (sizeof (struct emit_status));
4714 seq_rtl_expr = NULL;
4716 reg_rtx_no = LAST_VIRTUAL_REGISTER + 1;
4719 first_label_num = label_num;
4723 clear_emit_caches ();
4725 /* Init the tables that describe all the pseudo regs. */
4727 f->emit->regno_pointer_align_length = LAST_VIRTUAL_REGISTER + 101;
4729 f->emit->regno_pointer_align
4730 = (unsigned char *) xcalloc (f->emit->regno_pointer_align_length,
4731 sizeof (unsigned char));
4734 = (rtx *) xcalloc (f->emit->regno_pointer_align_length, sizeof (rtx));
4737 = (tree *) xcalloc (f->emit->regno_pointer_align_length, sizeof (tree));
4739 /* Put copies of all the virtual register rtx into regno_reg_rtx. */
4740 init_virtual_regs (f->emit);
4742 /* Indicate that the virtual registers and stack locations are
4744 REG_POINTER (stack_pointer_rtx) = 1;
4745 REG_POINTER (frame_pointer_rtx) = 1;
4746 REG_POINTER (hard_frame_pointer_rtx) = 1;
4747 REG_POINTER (arg_pointer_rtx) = 1;
4749 REG_POINTER (virtual_incoming_args_rtx) = 1;
4750 REG_POINTER (virtual_stack_vars_rtx) = 1;
4751 REG_POINTER (virtual_stack_dynamic_rtx) = 1;
4752 REG_POINTER (virtual_outgoing_args_rtx) = 1;
4753 REG_POINTER (virtual_cfa_rtx) = 1;
4755 #ifdef STACK_BOUNDARY
4756 REGNO_POINTER_ALIGN (STACK_POINTER_REGNUM) = STACK_BOUNDARY;
4757 REGNO_POINTER_ALIGN (FRAME_POINTER_REGNUM) = STACK_BOUNDARY;
4758 REGNO_POINTER_ALIGN (HARD_FRAME_POINTER_REGNUM) = STACK_BOUNDARY;
4759 REGNO_POINTER_ALIGN (ARG_POINTER_REGNUM) = STACK_BOUNDARY;
4761 REGNO_POINTER_ALIGN (VIRTUAL_INCOMING_ARGS_REGNUM) = STACK_BOUNDARY;
4762 REGNO_POINTER_ALIGN (VIRTUAL_STACK_VARS_REGNUM) = STACK_BOUNDARY;
4763 REGNO_POINTER_ALIGN (VIRTUAL_STACK_DYNAMIC_REGNUM) = STACK_BOUNDARY;
4764 REGNO_POINTER_ALIGN (VIRTUAL_OUTGOING_ARGS_REGNUM) = STACK_BOUNDARY;
4765 REGNO_POINTER_ALIGN (VIRTUAL_CFA_REGNUM) = BITS_PER_WORD;
4768 #ifdef INIT_EXPANDERS
4773 /* Mark SS for GC. */
4776 mark_sequence_stack (ss)
4777 struct sequence_stack *ss;
4781 ggc_mark_rtx (ss->first);
4782 ggc_mark_tree (ss->sequence_rtl_expr);
4787 /* Mark ES for GC. */
4790 mark_emit_status (es)
4791 struct emit_status *es;
4800 for (i = es->regno_pointer_align_length, r = es->x_regno_reg_rtx,
4802 i > 0; --i, ++r, ++t)
4808 mark_sequence_stack (es->sequence_stack);
4809 ggc_mark_tree (es->sequence_rtl_expr);
4810 ggc_mark_rtx (es->x_first_insn);
4813 /* Generate the constant 0. */
4816 gen_const_vector_0 (mode)
4817 enum machine_mode mode;
4822 enum machine_mode inner;
4824 units = GET_MODE_NUNITS (mode);
4825 inner = GET_MODE_INNER (mode);
4827 v = rtvec_alloc (units);
4829 /* We need to call this function after we to set CONST0_RTX first. */
4830 if (!CONST0_RTX (inner))
4833 for (i = 0; i < units; ++i)
4834 RTVEC_ELT (v, i) = CONST0_RTX (inner);
4836 tem = gen_rtx_CONST_VECTOR (mode, v);
4840 /* Create some permanent unique rtl objects shared between all functions.
4841 LINE_NUMBERS is nonzero if line numbers are to be generated. */
4844 init_emit_once (line_numbers)
4848 enum machine_mode mode;
4849 enum machine_mode double_mode;
4851 /* Initialize the CONST_INT and memory attribute hash tables. */
4852 const_int_htab = htab_create (37, const_int_htab_hash,
4853 const_int_htab_eq, NULL);
4854 ggc_add_deletable_htab (const_int_htab, 0, 0);
4856 mem_attrs_htab = htab_create (37, mem_attrs_htab_hash,
4857 mem_attrs_htab_eq, NULL);
4858 ggc_add_deletable_htab (mem_attrs_htab, 0, mem_attrs_mark);
4860 no_line_numbers = ! line_numbers;
4862 /* Compute the word and byte modes. */
4864 byte_mode = VOIDmode;
4865 word_mode = VOIDmode;
4866 double_mode = VOIDmode;
4868 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT); mode != VOIDmode;
4869 mode = GET_MODE_WIDER_MODE (mode))
4871 if (GET_MODE_BITSIZE (mode) == BITS_PER_UNIT
4872 && byte_mode == VOIDmode)
4875 if (GET_MODE_BITSIZE (mode) == BITS_PER_WORD
4876 && word_mode == VOIDmode)
4880 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT); mode != VOIDmode;
4881 mode = GET_MODE_WIDER_MODE (mode))
4883 if (GET_MODE_BITSIZE (mode) == DOUBLE_TYPE_SIZE
4884 && double_mode == VOIDmode)
4888 ptr_mode = mode_for_size (POINTER_SIZE, GET_MODE_CLASS (Pmode), 0);
4890 /* Assign register numbers to the globally defined register rtx.
4891 This must be done at runtime because the register number field
4892 is in a union and some compilers can't initialize unions. */
4894 pc_rtx = gen_rtx (PC, VOIDmode);
4895 cc0_rtx = gen_rtx (CC0, VOIDmode);
4896 stack_pointer_rtx = gen_raw_REG (Pmode, STACK_POINTER_REGNUM);
4897 frame_pointer_rtx = gen_raw_REG (Pmode, FRAME_POINTER_REGNUM);
4898 if (hard_frame_pointer_rtx == 0)
4899 hard_frame_pointer_rtx = gen_raw_REG (Pmode,
4900 HARD_FRAME_POINTER_REGNUM);
4901 if (arg_pointer_rtx == 0)
4902 arg_pointer_rtx = gen_raw_REG (Pmode, ARG_POINTER_REGNUM);
4903 virtual_incoming_args_rtx =
4904 gen_raw_REG (Pmode, VIRTUAL_INCOMING_ARGS_REGNUM);
4905 virtual_stack_vars_rtx =
4906 gen_raw_REG (Pmode, VIRTUAL_STACK_VARS_REGNUM);
4907 virtual_stack_dynamic_rtx =
4908 gen_raw_REG (Pmode, VIRTUAL_STACK_DYNAMIC_REGNUM);
4909 virtual_outgoing_args_rtx =
4910 gen_raw_REG (Pmode, VIRTUAL_OUTGOING_ARGS_REGNUM);
4911 virtual_cfa_rtx = gen_raw_REG (Pmode, VIRTUAL_CFA_REGNUM);
4913 /* These rtx must be roots if GC is enabled. */
4914 ggc_add_rtx_root (global_rtl, GR_MAX);
4916 #ifdef INIT_EXPANDERS
4917 /* This is to initialize {init|mark|free}_machine_status before the first
4918 call to push_function_context_to. This is needed by the Chill front
4919 end which calls push_function_context_to before the first call to
4920 init_function_start. */
4924 /* Create the unique rtx's for certain rtx codes and operand values. */
4926 /* Don't use gen_rtx here since gen_rtx in this case
4927 tries to use these variables. */
4928 for (i = - MAX_SAVED_CONST_INT; i <= MAX_SAVED_CONST_INT; i++)
4929 const_int_rtx[i + MAX_SAVED_CONST_INT] =
4930 gen_rtx_raw_CONST_INT (VOIDmode, i);
4931 ggc_add_rtx_root (const_int_rtx, 2 * MAX_SAVED_CONST_INT + 1);
4933 if (STORE_FLAG_VALUE >= - MAX_SAVED_CONST_INT
4934 && STORE_FLAG_VALUE <= MAX_SAVED_CONST_INT)
4935 const_true_rtx = const_int_rtx[STORE_FLAG_VALUE + MAX_SAVED_CONST_INT];
4937 const_true_rtx = gen_rtx_CONST_INT (VOIDmode, STORE_FLAG_VALUE);
4939 dconst0 = REAL_VALUE_ATOF ("0", double_mode);
4940 dconst1 = REAL_VALUE_ATOF ("1", double_mode);
4941 dconst2 = REAL_VALUE_ATOF ("2", double_mode);
4942 dconstm1 = REAL_VALUE_ATOF ("-1", double_mode);
4944 for (i = 0; i <= 2; i++)
4946 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT); mode != VOIDmode;
4947 mode = GET_MODE_WIDER_MODE (mode))
4949 rtx tem = rtx_alloc (CONST_DOUBLE);
4950 union real_extract u;
4952 /* Zero any holes in a structure. */
4953 memset ((char *) &u, 0, sizeof u);
4954 u.d = i == 0 ? dconst0 : i == 1 ? dconst1 : dconst2;
4956 /* Avoid trailing garbage in the rtx. */
4957 if (sizeof (u) < sizeof (HOST_WIDE_INT))
4958 CONST_DOUBLE_LOW (tem) = 0;
4959 if (sizeof (u) < 2 * sizeof (HOST_WIDE_INT))
4960 CONST_DOUBLE_HIGH (tem) = 0;
4962 memcpy (&CONST_DOUBLE_LOW (tem), &u, sizeof u);
4963 CONST_DOUBLE_CHAIN (tem) = NULL_RTX;
4964 PUT_MODE (tem, mode);
4966 const_tiny_rtx[i][(int) mode] = tem;
4969 const_tiny_rtx[i][(int) VOIDmode] = GEN_INT (i);
4971 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT); mode != VOIDmode;
4972 mode = GET_MODE_WIDER_MODE (mode))
4973 const_tiny_rtx[i][(int) mode] = GEN_INT (i);
4975 for (mode = GET_CLASS_NARROWEST_MODE (MODE_PARTIAL_INT);
4977 mode = GET_MODE_WIDER_MODE (mode))
4978 const_tiny_rtx[i][(int) mode] = GEN_INT (i);
4981 for (mode = GET_CLASS_NARROWEST_MODE (MODE_VECTOR_INT);
4983 mode = GET_MODE_WIDER_MODE (mode))
4984 const_tiny_rtx[0][(int) mode] = gen_const_vector_0 (mode);
4986 for (mode = GET_CLASS_NARROWEST_MODE (MODE_VECTOR_FLOAT);
4988 mode = GET_MODE_WIDER_MODE (mode))
4989 const_tiny_rtx[0][(int) mode] = gen_const_vector_0 (mode);
4991 for (i = (int) CCmode; i < (int) MAX_MACHINE_MODE; ++i)
4992 if (GET_MODE_CLASS ((enum machine_mode) i) == MODE_CC)
4993 const_tiny_rtx[0][i] = const0_rtx;
4995 const_tiny_rtx[0][(int) BImode] = const0_rtx;
4996 if (STORE_FLAG_VALUE == 1)
4997 const_tiny_rtx[1][(int) BImode] = const1_rtx;
4999 /* For bounded pointers, `&const_tiny_rtx[0][0]' is not the same as
5000 `(rtx *) const_tiny_rtx'. The former has bounds that only cover
5001 `const_tiny_rtx[0]', whereas the latter has bounds that cover all. */
5002 ggc_add_rtx_root ((rtx *) const_tiny_rtx, sizeof const_tiny_rtx / sizeof (rtx));
5003 ggc_add_rtx_root (&const_true_rtx, 1);
5005 #ifdef RETURN_ADDRESS_POINTER_REGNUM
5006 return_address_pointer_rtx
5007 = gen_raw_REG (Pmode, RETURN_ADDRESS_POINTER_REGNUM);
5011 struct_value_rtx = STRUCT_VALUE;
5013 struct_value_rtx = gen_rtx_REG (Pmode, STRUCT_VALUE_REGNUM);
5016 #ifdef STRUCT_VALUE_INCOMING
5017 struct_value_incoming_rtx = STRUCT_VALUE_INCOMING;
5019 #ifdef STRUCT_VALUE_INCOMING_REGNUM
5020 struct_value_incoming_rtx
5021 = gen_rtx_REG (Pmode, STRUCT_VALUE_INCOMING_REGNUM);
5023 struct_value_incoming_rtx = struct_value_rtx;
5027 #ifdef STATIC_CHAIN_REGNUM
5028 static_chain_rtx = gen_rtx_REG (Pmode, STATIC_CHAIN_REGNUM);
5030 #ifdef STATIC_CHAIN_INCOMING_REGNUM
5031 if (STATIC_CHAIN_INCOMING_REGNUM != STATIC_CHAIN_REGNUM)
5032 static_chain_incoming_rtx
5033 = gen_rtx_REG (Pmode, STATIC_CHAIN_INCOMING_REGNUM);
5036 static_chain_incoming_rtx = static_chain_rtx;
5040 static_chain_rtx = STATIC_CHAIN;
5042 #ifdef STATIC_CHAIN_INCOMING
5043 static_chain_incoming_rtx = STATIC_CHAIN_INCOMING;
5045 static_chain_incoming_rtx = static_chain_rtx;
5049 if (PIC_OFFSET_TABLE_REGNUM != INVALID_REGNUM)
5050 pic_offset_table_rtx = gen_raw_REG (Pmode, PIC_OFFSET_TABLE_REGNUM);
5052 ggc_add_rtx_root (&pic_offset_table_rtx, 1);
5053 ggc_add_rtx_root (&struct_value_rtx, 1);
5054 ggc_add_rtx_root (&struct_value_incoming_rtx, 1);
5055 ggc_add_rtx_root (&static_chain_rtx, 1);
5056 ggc_add_rtx_root (&static_chain_incoming_rtx, 1);
5057 ggc_add_rtx_root (&return_address_pointer_rtx, 1);
5060 /* Query and clear/ restore no_line_numbers. This is used by the
5061 switch / case handling in stmt.c to give proper line numbers in
5062 warnings about unreachable code. */
5065 force_line_numbers ()
5067 int old = no_line_numbers;
5069 no_line_numbers = 0;
5071 force_next_line_note ();
5076 restore_line_number_status (old_value)
5079 no_line_numbers = old_value;