/* Move registers around to reduce number of move instructions needed.
Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
- 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
+ 1999, 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
This file is part of GCC.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING. If not, write to the Free
-Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-02111-1307, USA. */
+Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301, USA. */
/* This module looks for cases where matching constraints would force
#include "except.h"
#include "toplev.h"
#include "reload.h"
+#include "timevar.h"
+#include "tree-pass.h"
/* Turn STACK_GROWS_DOWNWARD into a boolean. */
#define STACK_GROWS_DOWNWARD 0
#endif
-static int perhaps_ends_bb_p PARAMS ((rtx));
-static int optimize_reg_copy_1 PARAMS ((rtx, rtx, rtx));
-static void optimize_reg_copy_2 PARAMS ((rtx, rtx, rtx));
-static void optimize_reg_copy_3 PARAMS ((rtx, rtx, rtx));
-static void copy_src_to_dest PARAMS ((rtx, rtx, rtx, int));
+static int perhaps_ends_bb_p (rtx);
+static int optimize_reg_copy_1 (rtx, rtx, rtx);
+static void optimize_reg_copy_2 (rtx, rtx, rtx);
+static void optimize_reg_copy_3 (rtx, rtx, rtx);
+static void copy_src_to_dest (rtx, rtx, rtx, int);
static int *regmove_bb_head;
struct match {
int early_clobber[MAX_RECOG_OPERANDS];
};
-static rtx discover_flags_reg PARAMS ((void));
-static void mark_flags_life_zones PARAMS ((rtx));
-static void flags_set_1 PARAMS ((rtx, rtx, void *));
-
-static int try_auto_increment PARAMS ((rtx, rtx, rtx, rtx, HOST_WIDE_INT, int));
-static int find_matches PARAMS ((rtx, struct match *));
-static void replace_in_call_usage PARAMS ((rtx *, unsigned int, rtx, rtx));
-static int fixup_match_1 PARAMS ((rtx, rtx, rtx, rtx, rtx, int, int, int, FILE *))
-;
-static int reg_is_remote_constant_p PARAMS ((rtx, rtx, rtx));
-static int stable_and_no_regs_but_for_p PARAMS ((rtx, rtx, rtx));
-static int regclass_compatible_p PARAMS ((int, int));
-static int replacement_quality PARAMS ((rtx));
-static int fixup_match_2 PARAMS ((rtx, rtx, rtx, rtx, FILE *));
+static rtx discover_flags_reg (void);
+static void mark_flags_life_zones (rtx);
+static void flags_set_1 (rtx, rtx, void *);
+
+static int try_auto_increment (rtx, rtx, rtx, rtx, HOST_WIDE_INT, int);
+static int find_matches (rtx, struct match *);
+static void replace_in_call_usage (rtx *, unsigned int, rtx, rtx);
+static int fixup_match_1 (rtx, rtx, rtx, rtx, rtx, int, int, int, FILE *);
+static int reg_is_remote_constant_p (rtx, rtx, rtx);
+static int stable_and_no_regs_but_for_p (rtx, rtx, rtx);
+static int regclass_compatible_p (int, int);
+static int replacement_quality (rtx);
+static int fixup_match_2 (rtx, rtx, rtx, rtx, FILE *);
/* Return nonzero if registers with CLASS1 and CLASS2 can be merged without
causing too much register allocation problems. */
static int
-regclass_compatible_p (class0, class1)
- int class0, class1;
+regclass_compatible_p (int class0, int class1)
{
return (class0 == class1
|| (reg_class_subset_p (class0, class1)
Iff INC_INSN_SET is nonzero, inc_insn has a destination different from src.
Return nonzero for success. */
static int
-try_auto_increment (insn, inc_insn, inc_insn_set, reg, increment, pre)
- rtx reg, insn, inc_insn ,inc_insn_set;
- HOST_WIDE_INT increment;
- int pre;
+try_auto_increment (rtx insn, rtx inc_insn, rtx inc_insn_set, rtx reg,
+ HOST_WIDE_INT increment, int pre)
{
enum rtx_code inc_code;
/* If there is a REG_DEAD note on this insn, we must
change this not to REG_UNUSED meaning that the register
is set, but the value is dead. Failure to do so will
- result in a sched1 abort -- when it recomputes lifetime
+ result in a sched1 dieing -- when it recomputes lifetime
information, the number of REG_DEAD notes will have
changed. */
rtx note = find_reg_note (insn, REG_DEAD, reg);
if no flags were found. Return pc_rtx if we got confused. */
static rtx
-discover_flags_reg ()
+discover_flags_reg (void)
{
rtx tmp;
tmp = gen_rtx_REG (word_mode, 10000);
- tmp = gen_add3_insn (tmp, tmp, GEN_INT (2));
+ tmp = gen_add3_insn (tmp, tmp, const2_rtx);
/* If we get something that isn't a simple set, or a
[(set ..) (clobber ..)], this whole function will go wrong. */
scratch or something. We only care about hard regs.
Moreover we don't like the notion of subregs of hard regs. */
if (GET_CODE (tmp) == SUBREG
- && GET_CODE (SUBREG_REG (tmp)) == REG
+ && REG_P (SUBREG_REG (tmp))
&& REGNO (SUBREG_REG (tmp)) < FIRST_PSEUDO_REGISTER)
return pc_rtx;
- found = (GET_CODE (tmp) == REG && REGNO (tmp) < FIRST_PSEUDO_REGISTER);
+ found = (REG_P (tmp) && REGNO (tmp) < FIRST_PSEUDO_REGISTER);
return (found ? tmp : NULL_RTX);
}
static int flags_set_1_set;
static void
-mark_flags_life_zones (flags)
- rtx flags;
+mark_flags_life_zones (rtx flags)
{
int flags_regno;
int flags_nregs;
flags_nregs = 1;
#else
flags_regno = REGNO (flags);
- flags_nregs = HARD_REGNO_NREGS (flags_regno, GET_MODE (flags));
+ flags_nregs = hard_regno_nregs[flags_regno][GET_MODE (flags)];
#endif
flags_set_1_rtx = flags;
rtx insn, end;
int live;
- insn = block->head;
- end = block->end;
+ insn = BB_HEAD (block);
+ end = BB_END (block);
/* Look out for the (unlikely) case of flags being live across
basic block boundaries. */
{
int i;
for (i = 0; i < flags_nregs; ++i)
- live |= REGNO_REG_SET_P (block->global_live_at_start,
+ live |= REGNO_REG_SET_P (block->il.rtl->global_live_at_start,
flags_regno + i);
}
#endif
#endif
PUT_MODE (insn, (live ? HImode : VOIDmode));
- /* In either case, birth is denoted simply by it's presence
+ /* In either case, birth is denoted simply by its presence
as the destination of a set. */
flags_set_1_set = 0;
note_stores (PATTERN (insn), flags_set_1, NULL);
/* A subroutine of mark_flags_life_zones, called through note_stores. */
static void
-flags_set_1 (x, pat, data)
- rtx x, pat;
- void *data ATTRIBUTE_UNUSED;
+flags_set_1 (rtx x, rtx pat, void *data ATTRIBUTE_UNUSED)
{
if (GET_CODE (pat) == SET
&& reg_overlap_mentioned_p (x, flags_set_1_rtx))
a candidate for tying to a hard register, since the output might in
turn be a candidate to be tied to a different hard register. */
static int
-replacement_quality (reg)
- rtx reg;
+replacement_quality (rtx reg)
{
int src_regno;
/* Bad if this isn't a register at all. */
- if (GET_CODE (reg) != REG)
+ if (!REG_P (reg))
return 0;
/* If this register is not meant to get a hard register,
\f
/* Return 1 if INSN might end a basic block. */
-static int perhaps_ends_bb_p (insn)
- rtx insn;
+static int perhaps_ends_bb_p (rtx insn)
{
switch (GET_CODE (insn))
{
very conservative. */
if (nonlocal_goto_handler_labels)
return 1;
- /* FALLTHRU */
+ /* Fall through. */
default:
return can_throw_internal (insn);
}
register-register copy. */
static int
-optimize_reg_copy_1 (insn, dest, src)
- rtx insn;
- rtx dest;
- rtx src;
+optimize_reg_copy_1 (rtx insn, rtx dest, rtx src)
{
rtx p, q;
rtx note;
|| (sregno < FIRST_PSEUDO_REGISTER
&& asm_noperands (PATTERN (p)) >= 0
&& reg_overlap_mentioned_p (src, PATTERN (p)))
+ /* Don't change hard registers used by a call. */
+ || (CALL_P (p) && sregno < FIRST_PSEUDO_REGISTER
+ && find_reg_fusage (p, USE, src))
/* Don't change a USE of a register. */
|| (GET_CODE (PATTERN (p)) == USE
&& reg_overlap_mentioned_p (src, XEXP (PATTERN (p), 0))))
/* If the insn in which SRC dies is a CALL_INSN, don't count it
as a call that has been crossed. Otherwise, count it. */
- if (q != p && GET_CODE (q) == CALL_INSN)
+ if (q != p && CALL_P (q))
{
/* Similarly, total calls for SREGNO, total calls beyond
the death note for DREGNO. */
this for hard registers since the substitutions we may make might fail. */
static void
-optimize_reg_copy_2 (insn, dest, src)
- rtx insn;
- rtx dest;
- rtx src;
+optimize_reg_copy_2 (rtx insn, rtx dest, rtx src)
{
rtx p, q;
rtx set;
PATTERN (q) = replace_rtx (PATTERN (q), dest, src);
- if (GET_CODE (q) == CALL_INSN)
+ if (CALL_P (q))
{
REG_N_CALLS_CROSSED (dregno)--;
REG_N_CALLS_CROSSED (sregno)++;
if (reg_set_p (src, p)
|| find_reg_note (p, REG_DEAD, dest)
- || (GET_CODE (p) == CALL_INSN && REG_N_CALLS_CROSSED (sregno) == 0))
+ || (CALL_P (p) && REG_N_CALLS_CROSSED (sregno) == 0))
break;
}
}
the remaining accesses to use the appropriate SUBREG. This allows
SRC and DEST to be tied later. */
static void
-optimize_reg_copy_3 (insn, dest, src)
- rtx insn;
- rtx dest;
- rtx src;
+optimize_reg_copy_3 (rtx insn, rtx dest, rtx src)
{
rtx src_reg = XEXP (src, 0);
int src_no = REGNO (src_reg);
int dst_no = REGNO (dest);
- rtx p, set, subreg;
+ rtx p, set;
enum machine_mode old_mode;
if (src_no < FIRST_PSEUDO_REGISTER
return;
if (! (set = single_set (p))
- || GET_CODE (SET_SRC (set)) != MEM
+ || !MEM_P (SET_SRC (set))
/* If there's a REG_EQUIV note, this must be an insn that loads an
argument. Prefer keeping the note over doing this optimization. */
|| find_reg_note (p, REG_EQUIV, NULL_RTX)
/* Now walk forward making additional replacements. We want to be able
to undo all the changes if a later substitution fails. */
- subreg = gen_lowpart_SUBREG (old_mode, src_reg);
while (p = NEXT_INSN (p), p != insn)
{
if (! INSN_P (p))
continue;
- /* Make a tenative change. */
- validate_replace_rtx_group (src_reg, subreg, p);
+ /* Make a tentative change. */
+ validate_replace_rtx_group (src_reg,
+ gen_lowpart_SUBREG (old_mode, src_reg),
+ p);
}
validate_replace_rtx_group (src, src_reg, insn);
instead moving the value to dest directly before the operation. */
static void
-copy_src_to_dest (insn, src, dest, old_max_uid)
- rtx insn;
- rtx src;
- rtx dest;
- int old_max_uid;
+copy_src_to_dest (rtx insn, rtx src, rtx dest, int old_max_uid)
{
rtx seq;
rtx link;
parameter when there is no frame pointer that is not allocated a register.
For now, we just reject them, rather than incrementing the live length. */
- if (GET_CODE (src) == REG
+ if (REG_P (src)
&& REG_LIVE_LENGTH (REGNO (src)) > 0
- && GET_CODE (dest) == REG
- && !RTX_UNCHANGING_P (dest)
+ && REG_P (dest)
&& REG_LIVE_LENGTH (REGNO (dest)) > 0
&& (set = single_set (insn)) != NULL_RTX
&& !reg_mentioned_p (dest, SET_SRC (set))
bb = regmove_bb_head[insn_uid];
if (bb >= 0)
{
- BLOCK_HEAD (bb) = move_insn;
+ BB_HEAD (BASIC_BLOCK (bb)) = move_insn;
regmove_bb_head[insn_uid] = -1;
}
}
if (REGNO_LAST_UID (src_regno) == insn_uid)
REGNO_LAST_UID (src_regno) = move_uid;
-
- if (REGNO_LAST_NOTE_UID (src_regno) == insn_uid)
- REGNO_LAST_NOTE_UID (src_regno) = move_uid;
}
}
the first insn in the function. */
static int
-reg_is_remote_constant_p (reg, insn, first)
- rtx reg;
- rtx insn;
- rtx first;
+reg_is_remote_constant_p (rtx reg, rtx insn, rtx first)
{
rtx p;
continue;
s = single_set (XEXP (p, 0));
if (s != 0
- && GET_CODE (SET_DEST (s)) == REG
+ && REG_P (SET_DEST (s))
&& REGNO (SET_DEST (s)) == REGNO (reg))
{
/* The register is set in the same basic block. */
continue;
s = single_set (p);
if (s != 0
- && GET_CODE (SET_DEST (s)) == REG
+ && REG_P (SET_DEST (s))
&& REGNO (SET_DEST (s)) == REGNO (reg))
{
/* This is the instruction which sets REG. If there is a
hard register as ultimate source, like the frame pointer. */
static int
-fixup_match_2 (insn, dst, src, offset, regmove_dump_file)
- rtx insn, dst, src, offset;
- FILE *regmove_dump_file;
+fixup_match_2 (rtx insn, rtx dst, rtx src, rtx offset, FILE *regmove_dump_file)
{
rtx p, dst_death = 0;
int length, num_calls = 0;
#ifdef AUTO_INC_DEC
for (p = PREV_INSN (insn); p; p = PREV_INSN (p))
{
- if (GET_CODE (p) == CODE_LABEL
- || GET_CODE (p) == JUMP_INSN)
+ if (LABEL_P (p)
+ || JUMP_P (p))
break;
if (! INSN_P (p))
continue;
}
for (p = NEXT_INSN (insn); p; p = NEXT_INSN (p))
{
- if (GET_CODE (p) == CODE_LABEL
- || GET_CODE (p) == JUMP_INSN)
+ if (LABEL_P (p)
+ || JUMP_P (p))
break;
if (! INSN_P (p))
continue;
/* reg_set_p is overly conservative for CALL_INSNS, thinks that all
hard regs are clobbered. Thus, we only use it for src for
non-call insns. */
- if (GET_CODE (p) == CALL_INSN)
+ if (CALL_P (p))
{
if (! dst_death)
num_calls++;
(or 0 if none should be output). */
void
-regmove_optimize (f, nregs, regmove_dump_file)
- rtx f;
- int nregs;
- FILE *regmove_dump_file;
+regmove_optimize (rtx f, int nregs, FILE *regmove_dump_file)
{
int old_max_uid = get_max_uid ();
rtx insn;
can suppress some optimizations in those zones. */
mark_flags_life_zones (discover_flags_reg ());
- regno_src_regno = (int *) xmalloc (sizeof *regno_src_regno * nregs);
+ regno_src_regno = xmalloc (sizeof *regno_src_regno * nregs);
for (i = nregs; --i >= 0; ) regno_src_regno[i] = -1;
- regmove_bb_head = (int *) xmalloc (sizeof (int) * (old_max_uid + 1));
+ regmove_bb_head = xmalloc (sizeof (int) * (old_max_uid + 1));
for (i = old_max_uid; i >= 0; i--) regmove_bb_head[i] = -1;
FOR_EACH_BB (bb)
- regmove_bb_head[INSN_UID (bb->head)] = bb->index;
+ regmove_bb_head[INSN_UID (BB_HEAD (bb))] = bb->index;
/* A forward/backward pass. Replace output operands with input operands. */
if (flag_expensive_optimizations && ! pass
&& (GET_CODE (SET_SRC (set)) == SIGN_EXTEND
|| GET_CODE (SET_SRC (set)) == ZERO_EXTEND)
- && GET_CODE (XEXP (SET_SRC (set), 0)) == REG
- && GET_CODE (SET_DEST (set)) == REG)
+ && REG_P (XEXP (SET_SRC (set), 0))
+ && REG_P (SET_DEST (set)))
optimize_reg_copy_3 (insn, SET_DEST (set), SET_SRC (set));
if (flag_expensive_optimizations && ! pass
- && GET_CODE (SET_SRC (set)) == REG
- && GET_CODE (SET_DEST (set)) == REG)
+ && REG_P (SET_SRC (set))
+ && REG_P (SET_DEST (set)))
{
/* If this is a register-register copy where SRC is not dead,
see if we can optimize it. If this optimization succeeds,
src = recog_data.operand[op_no];
dst = recog_data.operand[match_no];
- if (GET_CODE (src) != REG)
+ if (!REG_P (src))
continue;
src_subreg = src;
&& GET_MODE_SIZE (GET_MODE (dst))
>= GET_MODE_SIZE (GET_MODE (SUBREG_REG (dst))))
{
- src_subreg
- = gen_rtx_SUBREG (GET_MODE (SUBREG_REG (dst)),
- src, SUBREG_BYTE (dst));
dst = SUBREG_REG (dst);
+ src_subreg = lowpart_subreg (GET_MODE (dst),
+ src, GET_MODE (src));
+ if (!src_subreg)
+ continue;
}
- if (GET_CODE (dst) != REG
+ if (!REG_P (dst)
|| REGNO (dst) < FIRST_PSEUDO_REGISTER)
continue;
dst = recog_data.operand[match_no];
src = recog_data.operand[op_no];
- if (GET_CODE (src) != REG)
+ if (!REG_P (src))
continue;
- if (GET_CODE (dst) != REG
+ if (!REG_P (dst)
|| REGNO (dst) < FIRST_PSEUDO_REGISTER
|| REG_LIVE_LENGTH (REGNO (dst)) < 0
- || RTX_UNCHANGING_P (dst))
+ || GET_MODE (src) != GET_MODE (dst))
continue;
/* If the operands already match, then there is nothing to do. */
/* If we have passed a call instruction, and the
pseudo-reg DST is not already live across a call,
then don't perform the optimization. */
- if (GET_CODE (p) == CALL_INSN)
+ if (CALL_P (p))
{
num_calls++;
ends. Fix that here. */
FOR_EACH_BB (bb)
{
- rtx end = bb->end;
+ rtx end = BB_END (bb);
rtx new = end;
rtx next = NEXT_INSN (new);
while (next != 0 && INSN_UID (next) >= old_max_uid
- && (bb->next_bb == EXIT_BLOCK_PTR || bb->next_bb->head != next))
+ && (bb->next_bb == EXIT_BLOCK_PTR || BB_HEAD (bb->next_bb) != next))
new = next, next = NEXT_INSN (new);
- bb->end = new;
+ BB_END (bb) = new;
}
done:
Initialize the info in MATCHP based on the constraints. */
static int
-find_matches (insn, matchp)
- rtx insn;
- struct match *matchp;
+find_matches (rtx insn, struct match *matchp)
{
int likely_spilled[MAX_RECOG_OPERANDS];
int op_no;
assumed to be in INSN. */
static void
-replace_in_call_usage (loc, dst_reg, src, insn)
- rtx *loc;
- unsigned int dst_reg;
- rtx src;
- rtx insn;
+replace_in_call_usage (rtx *loc, unsigned int dst_reg, rtx src, rtx insn)
{
rtx x = *loc;
enum rtx_code code;
Return nonzero for success. */
static int
-fixup_match_1 (insn, set, src, src_subreg, dst, backward, operand_number,
- match_number, regmove_dump_file)
- rtx insn, set, src, src_subreg, dst;
- int backward, operand_number, match_number;
- FILE *regmove_dump_file;
+fixup_match_1 (rtx insn, rtx set, rtx src, rtx src_subreg, rtx dst,
+ int backward, int operand_number, int match_number,
+ FILE *regmove_dump_file)
{
rtx p;
rtx post_inc = 0, post_inc_set = 0, search_end = 0;
rtx src_note = find_reg_note (insn, REG_DEAD, src), dst_note = NULL_RTX;
int length, s_length;
- /* If SRC is marked as unchanging, we may not change it.
- ??? Maybe we could get better code by removing the unchanging bit
- instead, and changing it back if we don't succeed? */
- if (RTX_UNCHANGING_P (src))
- return 0;
-
if (! src_note)
{
/* Look for (set (regX) (op regA constX))
for (length = s_length = 0, p = NEXT_INSN (insn); p; p = NEXT_INSN (p))
{
- if (GET_CODE (p) == CALL_INSN)
+ if (CALL_P (p))
replace_in_call_usage (& CALL_INSN_FUNCTION_USAGE (p),
REGNO (dst), src, p);
hard register. */
&& ! (dst_note && ! REG_N_CALLS_CROSSED (REGNO (dst))
&& single_set (p)
- && GET_CODE (SET_DEST (single_set (p))) == REG
+ && REG_P (SET_DEST (single_set (p)))
&& (REGNO (SET_DEST (single_set (p)))
< FIRST_PSEUDO_REGISTER))
/* We may only emit an insn directly after P if we
/* If we have passed a call instruction, and the pseudo-reg SRC is not
already live across a call, then don't perform the optimization. */
- if (GET_CODE (p) == CALL_INSN)
+ if (CALL_P (p))
{
if (REG_N_CALLS_CROSSED (REGNO (src)) == 0)
break;
q = 0;
break;
}
- if (GET_CODE (p) == CALL_INSN)
+ if (CALL_P (p))
num_calls2++;
}
if (q && set2 && SET_DEST (set2) == src && CONSTANT_P (SET_SRC (set2))
}
-/* return nonzero if X is stable and mentions no regsiters but for
+/* Return nonzero if X is stable and mentions no registers but for
mentioning SRC or mentioning / changing DST . If in doubt, presume
it is unstable.
The rationale is that we want to check if we can move an insn easily
- while just paying attention to SRC and DST. A register is considered
- stable if it has the RTX_UNCHANGING_P bit set, but that would still
- leave the burden to update REG_DEAD / REG_UNUSED notes, so we don't
- want any registers but SRC and DST. */
+ while just paying attention to SRC and DST. */
static int
-stable_and_no_regs_but_for_p (x, src, dst)
- rtx x, src, dst;
+stable_and_no_regs_but_for_p (rtx x, rtx src, rtx dst)
{
RTX_CODE code = GET_CODE (x);
switch (GET_RTX_CLASS (code))
{
- case '<': case '1': case 'c': case '2': case 'b': case '3':
+ case RTX_UNARY:
+ case RTX_BIN_ARITH:
+ case RTX_COMM_ARITH:
+ case RTX_COMPARE:
+ case RTX_COMM_COMPARE:
+ case RTX_TERNARY:
+ case RTX_BITFIELD_OPS:
{
int i;
const char *fmt = GET_RTX_FORMAT (code);
return 0;
return 1;
}
- case 'o':
+ case RTX_OBJ:
if (code == REG)
return x == src || x == dst;
/* If this is a MEM, look inside - there might be a register hidden in
if (code == MEM
&& ! stable_and_no_regs_but_for_p (XEXP (x, 0), src, dst))
return 0;
- /* fall through */
+ /* Fall through. */
default:
return ! rtx_unstable_p (x);
}
struct csa_memlist *next;
};
-static int stack_memref_p PARAMS ((rtx));
-static rtx single_set_for_csa PARAMS ((rtx));
-static void free_csa_memlist PARAMS ((struct csa_memlist *));
-static struct csa_memlist *record_one_stack_memref
- PARAMS ((rtx, rtx *, struct csa_memlist *));
-static int try_apply_stack_adjustment
- PARAMS ((rtx, struct csa_memlist *, HOST_WIDE_INT, HOST_WIDE_INT));
-static void combine_stack_adjustments_for_block PARAMS ((basic_block));
-static int record_stack_memrefs PARAMS ((rtx *, void *));
+static int stack_memref_p (rtx);
+static rtx single_set_for_csa (rtx);
+static void free_csa_memlist (struct csa_memlist *);
+static struct csa_memlist *record_one_stack_memref (rtx, rtx *,
+ struct csa_memlist *);
+static int try_apply_stack_adjustment (rtx, struct csa_memlist *,
+ HOST_WIDE_INT, HOST_WIDE_INT);
+static void combine_stack_adjustments_for_block (basic_block);
+static int record_stack_memrefs (rtx *, void *);
/* Main entry point for stack adjustment combination. */
void
-combine_stack_adjustments ()
+combine_stack_adjustments (void)
{
basic_block bb;
/* Recognize a MEM of the form (sp) or (plus sp const). */
static int
-stack_memref_p (x)
- rtx x;
+stack_memref_p (rtx x)
{
- if (GET_CODE (x) != MEM)
+ if (!MEM_P (x))
return 0;
x = XEXP (x, 0);
tying fp and sp adjustments. */
static rtx
-single_set_for_csa (insn)
- rtx insn;
+single_set_for_csa (rtx insn)
{
int i;
rtx tmp = single_set (insn);
if (tmp)
return tmp;
- if (GET_CODE (insn) != INSN
+ if (!NONJUMP_INSN_P (insn)
|| GET_CODE (PATTERN (insn)) != PARALLEL)
return NULL_RTX;
/* Free the list of csa_memlist nodes. */
static void
-free_csa_memlist (memlist)
- struct csa_memlist *memlist;
+free_csa_memlist (struct csa_memlist *memlist)
{
struct csa_memlist *next;
for (; memlist ; memlist = next)
It is already known that the memory is stack_memref_p. */
static struct csa_memlist *
-record_one_stack_memref (insn, mem, next_memlist)
- rtx insn, *mem;
- struct csa_memlist *next_memlist;
+record_one_stack_memref (rtx insn, rtx *mem, struct csa_memlist *next_memlist)
{
struct csa_memlist *ml;
- ml = (struct csa_memlist *) xmalloc (sizeof (*ml));
+ ml = xmalloc (sizeof (*ml));
if (XEXP (*mem, 0) == stack_pointer_rtx)
ml->sp_offset = 0;
as each of the memories in MEMLIST. Return true on success. */
static int
-try_apply_stack_adjustment (insn, memlist, new_adjust, delta)
- rtx insn;
- struct csa_memlist *memlist;
- HOST_WIDE_INT new_adjust, delta;
+try_apply_stack_adjustment (rtx insn, struct csa_memlist *memlist, HOST_WIDE_INT new_adjust,
+ HOST_WIDE_INT delta)
{
struct csa_memlist *ml;
rtx set;
};
static int
-record_stack_memrefs (xp, data)
- rtx *xp;
- void *data;
+record_stack_memrefs (rtx *xp, void *data)
{
rtx x = *xp;
struct record_stack_memrefs_data *d =
return 1;
case REG:
/* ??? We want be able to handle non-memory stack pointer
- references later. For now just discard all insns refering to
+ references later. For now just discard all insns referring to
stack pointer outside mem expressions. We would probably
want to teach validate_replace to simplify expressions first.
We can't just compare with STACK_POINTER_RTX because the
reference to the stack pointer might be in some other mode.
In particular, an explicit clobber in an asm statement will
- result in a QImode clober. */
+ result in a QImode clobber. */
if (REGNO (x) == STACK_POINTER_REGNUM)
return 1;
break;
/* Subroutine of combine_stack_adjustments, called for each basic block. */
static void
-combine_stack_adjustments_for_block (bb)
- basic_block bb;
+combine_stack_adjustments_for_block (basic_block bb)
{
HOST_WIDE_INT last_sp_adjust = 0;
rtx last_sp_set = NULL_RTX;
struct record_stack_memrefs_data data;
bool end_of_block = false;
- for (insn = bb->head; !end_of_block ; insn = next)
+ for (insn = BB_HEAD (bb); !end_of_block ; insn = next)
{
- end_of_block = insn == bb->end;
+ end_of_block = insn == BB_END (bb);
next = NEXT_INSN (insn);
if (! INSN_P (insn))
turn it into a direct store. Obviously we can't do this if
there were any intervening uses of the stack pointer. */
if (memlist == NULL
- && GET_CODE (dest) == MEM
+ && MEM_P (dest)
&& ((GET_CODE (XEXP (dest, 0)) == PRE_DEC
&& (last_sp_adjust
== (HOST_WIDE_INT) GET_MODE_SIZE (GET_MODE (dest))))
data.insn = insn;
data.memlist = memlist;
- if (GET_CODE (insn) != CALL_INSN && last_sp_set
+ if (!CALL_P (insn) && last_sp_set
&& !for_each_rtx (&PATTERN (insn), record_stack_memrefs, &data))
{
memlist = data.memlist;
/* Otherwise, we were not able to process the instruction.
Do not continue collecting data across such a one. */
if (last_sp_set
- && (GET_CODE (insn) == CALL_INSN
+ && (CALL_P (insn)
|| reg_mentioned_p (stack_pointer_rtx, PATTERN (insn))))
{
if (last_sp_set && last_sp_adjust == 0)
if (last_sp_set && last_sp_adjust == 0)
delete_insn (last_sp_set);
+
+ if (memlist)
+ free_csa_memlist (memlist);
+}
+\f
+static bool
+gate_handle_regmove (void)
+{
+ return (optimize > 0 && flag_regmove);
+}
+
+
+/* Register allocation pre-pass, to reduce number of moves necessary
+ for two-address machines. */
+static void
+rest_of_handle_regmove (void)
+{
+ regmove_optimize (get_insns (), max_reg_num (), dump_file);
+ cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
+}
+
+struct tree_opt_pass pass_regmove =
+{
+ "regmove", /* name */
+ gate_handle_regmove, /* gate */
+ rest_of_handle_regmove, /* execute */
+ NULL, /* sub */
+ NULL, /* next */
+ 0, /* static_pass_number */
+ TV_REGMOVE, /* tv_id */
+ 0, /* properties_required */
+ 0, /* properties_provided */
+ 0, /* properties_destroyed */
+ 0, /* todo_flags_start */
+ TODO_dump_func |
+ TODO_ggc_collect, /* todo_flags_finish */
+ 'N' /* letter */
+};
+
+
+static bool
+gate_handle_stack_adjustments (void)
+{
+ return (optimize > 0);
}
+
+static void
+rest_of_handle_stack_adjustments (void)
+{
+ life_analysis (dump_file, PROP_POSTRELOAD);
+ cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
+ | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
+
+ /* This is kind of a heuristic. We need to run combine_stack_adjustments
+ even for machines with possibly nonzero RETURN_POPS_ARGS
+ and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
+ push instructions will have popping returns. */
+#ifndef PUSH_ROUNDING
+ if (!ACCUMULATE_OUTGOING_ARGS)
+#endif
+ combine_stack_adjustments ();
+}
+
+struct tree_opt_pass pass_stack_adjustments =
+{
+ NULL, /* name */
+ gate_handle_stack_adjustments, /* gate */
+ rest_of_handle_stack_adjustments, /* execute */
+ NULL, /* sub */
+ NULL, /* next */
+ 0, /* static_pass_number */
+ 0, /* tv_id */
+ 0, /* properties_required */
+ 0, /* properties_provided */
+ 0, /* properties_destroyed */
+ 0, /* todo_flags_start */
+ TODO_dump_func |
+ TODO_ggc_collect, /* todo_flags_finish */
+ 0 /* letter */
+};
+
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