/* Subroutines used by or related to instruction recognition.
Copyright (C) 1987, 1988, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998
- 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
+ 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
Free Software Foundation, Inc.
This file is part of GCC.
}
#endif
-static void validate_replace_rtx_1 (rtx *, rtx, rtx, rtx);
+static void validate_replace_rtx_1 (rtx *, rtx, rtx, rtx, bool);
static void validate_replace_src_1 (rtx *, void *);
static rtx split_insn (rtx);
const char *c = constraints[i];
if (c[0] == '%')
c++;
- if (ISDIGIT ((unsigned char) c[0]) && c[1] == '\0')
- c = constraints[c[0] - '0'];
-
- if (! asm_operand_ok (operands[i], c))
+ if (! asm_operand_ok (operands[i], c, constraints))
return 0;
}
num_changes = num;
}
-/* Replace every occurrence of FROM in X with TO. Mark each change with
- validate_change passing OBJECT. */
+/* A subroutine of validate_replace_rtx_1 that tries to simplify the resulting
+ rtx. */
static void
-validate_replace_rtx_1 (rtx *loc, rtx from, rtx to, rtx object)
+simplify_while_replacing (rtx *loc, rtx to, rtx object,
+ enum machine_mode op0_mode)
{
- int i, j;
- const char *fmt;
rtx x = *loc;
- enum rtx_code code;
- enum machine_mode op0_mode = VOIDmode;
- int prev_changes = num_changes;
+ enum rtx_code code = GET_CODE (x);
rtx new_rtx;
- if (!x)
- return;
-
- code = GET_CODE (x);
- fmt = GET_RTX_FORMAT (code);
- if (fmt[0] == 'e')
- op0_mode = GET_MODE (XEXP (x, 0));
-
- /* X matches FROM if it is the same rtx or they are both referring to the
- same register in the same mode. Avoid calling rtx_equal_p unless the
- operands look similar. */
-
- if (x == from
- || (REG_P (x) && REG_P (from)
- && GET_MODE (x) == GET_MODE (from)
- && REGNO (x) == REGNO (from))
- || (GET_CODE (x) == GET_CODE (from) && GET_MODE (x) == GET_MODE (from)
- && rtx_equal_p (x, from)))
- {
- validate_unshare_change (object, loc, to, 1);
- return;
- }
-
- /* Call ourself recursively to perform the replacements.
- We must not replace inside already replaced expression, otherwise we
- get infinite recursion for replacements like (reg X)->(subreg (reg X))
- done by regmove, so we must special case shared ASM_OPERANDS. */
-
- if (GET_CODE (x) == PARALLEL)
- {
- for (j = XVECLEN (x, 0) - 1; j >= 0; j--)
- {
- if (j && GET_CODE (XVECEXP (x, 0, j)) == SET
- && GET_CODE (SET_SRC (XVECEXP (x, 0, j))) == ASM_OPERANDS)
- {
- /* Verify that operands are really shared. */
- gcc_assert (ASM_OPERANDS_INPUT_VEC (SET_SRC (XVECEXP (x, 0, 0)))
- == ASM_OPERANDS_INPUT_VEC (SET_SRC (XVECEXP
- (x, 0, j))));
- validate_replace_rtx_1 (&SET_DEST (XVECEXP (x, 0, j)),
- from, to, object);
- }
- else
- validate_replace_rtx_1 (&XVECEXP (x, 0, j), from, to, object);
- }
- }
- else
- for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
- {
- if (fmt[i] == 'e')
- validate_replace_rtx_1 (&XEXP (x, i), from, to, object);
- else if (fmt[i] == 'E')
- for (j = XVECLEN (x, i) - 1; j >= 0; j--)
- validate_replace_rtx_1 (&XVECEXP (x, i, j), from, to, object);
- }
-
- /* If we didn't substitute, there is nothing more to do. */
- if (num_changes == prev_changes)
- return;
-
- /* Allow substituted expression to have different mode. This is used by
- regmove to change mode of pseudo register. */
- if (fmt[0] == 'e' && GET_MODE (XEXP (x, 0)) != VOIDmode)
- op0_mode = GET_MODE (XEXP (x, 0));
-
- /* Do changes needed to keep rtx consistent. Don't do any other
- simplifications, as it is not our job. */
-
if (SWAPPABLE_OPERANDS_P (x)
&& swap_commutative_operands_p (XEXP (x, 0), XEXP (x, 1)))
{
}
}
+/* Replace every occurrence of FROM in X with TO. Mark each change with
+ validate_change passing OBJECT. */
+
+static void
+validate_replace_rtx_1 (rtx *loc, rtx from, rtx to, rtx object,
+ bool simplify)
+{
+ int i, j;
+ const char *fmt;
+ rtx x = *loc;
+ enum rtx_code code;
+ enum machine_mode op0_mode = VOIDmode;
+ int prev_changes = num_changes;
+
+ if (!x)
+ return;
+
+ code = GET_CODE (x);
+ fmt = GET_RTX_FORMAT (code);
+ if (fmt[0] == 'e')
+ op0_mode = GET_MODE (XEXP (x, 0));
+
+ /* X matches FROM if it is the same rtx or they are both referring to the
+ same register in the same mode. Avoid calling rtx_equal_p unless the
+ operands look similar. */
+
+ if (x == from
+ || (REG_P (x) && REG_P (from)
+ && GET_MODE (x) == GET_MODE (from)
+ && REGNO (x) == REGNO (from))
+ || (GET_CODE (x) == GET_CODE (from) && GET_MODE (x) == GET_MODE (from)
+ && rtx_equal_p (x, from)))
+ {
+ validate_unshare_change (object, loc, to, 1);
+ return;
+ }
+
+ /* Call ourself recursively to perform the replacements.
+ We must not replace inside already replaced expression, otherwise we
+ get infinite recursion for replacements like (reg X)->(subreg (reg X))
+ done by regmove, so we must special case shared ASM_OPERANDS. */
+
+ if (GET_CODE (x) == PARALLEL)
+ {
+ for (j = XVECLEN (x, 0) - 1; j >= 0; j--)
+ {
+ if (j && GET_CODE (XVECEXP (x, 0, j)) == SET
+ && GET_CODE (SET_SRC (XVECEXP (x, 0, j))) == ASM_OPERANDS)
+ {
+ /* Verify that operands are really shared. */
+ gcc_assert (ASM_OPERANDS_INPUT_VEC (SET_SRC (XVECEXP (x, 0, 0)))
+ == ASM_OPERANDS_INPUT_VEC (SET_SRC (XVECEXP
+ (x, 0, j))));
+ validate_replace_rtx_1 (&SET_DEST (XVECEXP (x, 0, j)),
+ from, to, object, simplify);
+ }
+ else
+ validate_replace_rtx_1 (&XVECEXP (x, 0, j), from, to, object,
+ simplify);
+ }
+ }
+ else
+ for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
+ {
+ if (fmt[i] == 'e')
+ validate_replace_rtx_1 (&XEXP (x, i), from, to, object, simplify);
+ else if (fmt[i] == 'E')
+ for (j = XVECLEN (x, i) - 1; j >= 0; j--)
+ validate_replace_rtx_1 (&XVECEXP (x, i, j), from, to, object,
+ simplify);
+ }
+
+ /* If we didn't substitute, there is nothing more to do. */
+ if (num_changes == prev_changes)
+ return;
+
+ /* Allow substituted expression to have different mode. This is used by
+ regmove to change mode of pseudo register. */
+ if (fmt[0] == 'e' && GET_MODE (XEXP (x, 0)) != VOIDmode)
+ op0_mode = GET_MODE (XEXP (x, 0));
+
+ /* Do changes needed to keep rtx consistent. Don't do any other
+ simplifications, as it is not our job. */
+ if (simplify)
+ simplify_while_replacing (loc, to, object, op0_mode);
+}
+
/* Try replacing every occurrence of FROM in INSN with TO. After all
changes have been made, validate by seeing if INSN is still valid. */
int
validate_replace_rtx (rtx from, rtx to, rtx insn)
{
- validate_replace_rtx_1 (&PATTERN (insn), from, to, insn);
+ validate_replace_rtx_1 (&PATTERN (insn), from, to, insn, true);
+ return apply_change_group ();
+}
+
+/* Try replacing every occurrence of FROM in WHERE with TO. Assume that WHERE
+ is a part of INSN. After all changes have been made, validate by seeing if
+ INSN is still valid.
+ validate_replace_rtx (from, to, insn) is equivalent to
+ validate_replace_rtx_part (from, to, &PATTERN (insn), insn). */
+
+int
+validate_replace_rtx_part (rtx from, rtx to, rtx *where, rtx insn)
+{
+ validate_replace_rtx_1 (where, from, to, insn, true);
+ return apply_change_group ();
+}
+
+/* Same as above, but do not simplify rtx afterwards. */
+int
+validate_replace_rtx_part_nosimplify (rtx from, rtx to, rtx *where,
+ rtx insn)
+{
+ validate_replace_rtx_1 (where, from, to, insn, false);
return apply_change_group ();
+
}
/* Try replacing every occurrence of FROM in INSN with TO. */
void
validate_replace_rtx_group (rtx from, rtx to, rtx insn)
{
- validate_replace_rtx_1 (&PATTERN (insn), from, to, insn);
+ validate_replace_rtx_1 (&PATTERN (insn), from, to, insn, true);
}
/* Function called by note_uses to replace used subexpressions. */
struct validate_replace_src_data *d
= (struct validate_replace_src_data *) data;
- validate_replace_rtx_1 (x, d->from, d->to, d->insn);
+ validate_replace_rtx_1 (x, d->from, d->to, d->insn, true);
}
/* Try replacing every occurrence of FROM in INSN with TO, avoiding
Return > 0 if ok, = 0 if bad, < 0 if inconclusive. */
int
-asm_operand_ok (rtx op, const char *constraint)
+asm_operand_ok (rtx op, const char *constraint, const char **constraints)
{
int result = 0;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
- /* For best results, our caller should have given us the
- proper matching constraint, but we can't actually fail
- the check if they didn't. Indicate that results are
- inconclusive. */
- do
- constraint++;
- while (ISDIGIT (*constraint));
- if (! result)
- result = -1;
+ /* If caller provided constraints pointer, look up
+ the maching constraint. Otherwise, our caller should have
+ given us the proper matching constraint, but we can't
+ actually fail the check if they didn't. Indicate that
+ results are inconclusive. */
+ if (constraints)
+ {
+ char *end;
+ unsigned long match;
+
+ match = strtoul (constraint, &end, 10);
+ if (!result)
+ result = asm_operand_ok (op, constraints[match], NULL);
+ constraint = (const char *) end;
+ }
+ else
+ {
+ do
+ constraint++;
+ while (ISDIGIT (*constraint));
+ if (! result)
+ result = -1;
+ }
continue;
case 'p':
result = 1;
}
#ifdef EXTRA_CONSTRAINT_STR
+ else if (EXTRA_MEMORY_CONSTRAINT (c, constraint))
+ /* Every memory operand can be reloaded to fit. */
+ result = result || memory_operand (op, VOIDmode);
+ else if (EXTRA_ADDRESS_CONSTRAINT (c, constraint))
+ /* Every address operand can be reloaded to fit. */
+ result = result || address_operand (op, VOIDmode);
else if (EXTRA_CONSTRAINT_STR (op, c, constraint))
result = 1;
- else if (EXTRA_MEMORY_CONSTRAINT (c, constraint)
- /* Every memory operand can be reloaded to fit. */
- && memory_operand (op, VOIDmode))
- result = 1;
- else if (EXTRA_ADDRESS_CONSTRAINT (c, constraint)
- /* Every address operand can be reloaded to fit. */
- && address_operand (op, VOIDmode))
- result = 1;
#endif
break;
}
/* Split insns here to get max fine-grain parallelism. */
rtx first = PREV_INSN (insn);
rtx last = try_split (PATTERN (insn), insn, 1);
+ rtx insn_set, last_set, note;
if (last == insn)
return NULL_RTX;
+ /* If the original instruction was a single set that was known to be
+ equivalent to a constant, see if we can say the same about the last
+ instruction in the split sequence. The two instructions must set
+ the same destination. */
+ insn_set = single_set (insn);
+ if (insn_set)
+ {
+ last_set = single_set (last);
+ if (last_set && rtx_equal_p (SET_DEST (last_set), SET_DEST (insn_set)))
+ {
+ note = find_reg_equal_equiv_note (insn);
+ if (note && CONSTANT_P (XEXP (note, 0)))
+ set_unique_reg_note (last, REG_EQUAL, XEXP (note, 0));
+ else if (CONSTANT_P (SET_SRC (insn_set)))
+ set_unique_reg_note (last, REG_EQUAL, SET_SRC (insn_set));
+ }
+ }
+
/* try_split returns the NOTE that INSN became. */
SET_INSN_DELETED (insn);
first = NEXT_INSN (first);
}
}
+
return last;
}
rtx insn, next;
bool finish = false;
+ rtl_profile_for_bb (bb);
for (insn = BB_HEAD (bb); !finish ; insn = next)
{
/* Can't use `next_real_insn' because that might go across
}
}
+ default_rtl_profile ();
if (changed)
find_many_sub_basic_blocks (blocks);
FOR_EACH_BB_REVERSE (bb)
{
+ rtl_profile_for_bb (bb);
/* Indicate that all slots except the last holds invalid data. */
for (i = 0; i < MAX_INSNS_PER_PEEP2; ++i)
peep2_insn_data[i].insn = NULL_RTX;
/* Start up propagation. */
bitmap_copy (live, DF_LR_OUT (bb));
- df_simulate_artificial_refs_at_end (bb, live);
+ df_simulate_initialize_backwards (bb, live);
bitmap_copy (peep2_insn_data[MAX_INSNS_PER_PEEP2].live_before, live);
for (insn = BB_END (bb); ; insn = prev)
&& peep2_insn_data[peep2_current].insn == NULL_RTX)
peep2_current_count++;
peep2_insn_data[peep2_current].insn = insn;
- df_simulate_one_insn (bb, insn, live);
+ df_simulate_one_insn_backwards (bb, insn, live);
COPY_REG_SET (peep2_insn_data[peep2_current].live_before, live);
if (RTX_FRAME_RELATED_P (insn))
peep2_current_count++;
peep2_insn_data[i].insn = x;
df_insn_rescan (x);
- df_simulate_one_insn (bb, x, live);
+ df_simulate_one_insn_backwards (bb, x, live);
bitmap_copy (peep2_insn_data[i].live_before, live);
}
x = PREV_INSN (x);
}
}
+ default_rtl_profile ();
for (i = 0; i < MAX_INSNS_PER_PEEP2 + 1; ++i)
BITMAP_FREE (peep2_insn_data[i].live_before);
BITMAP_FREE (live);
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