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2019-01-25 Vladimir Makarov <vmakarov@redhat.com>

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PR rtl-optimization/888846
	* ira.c (process_set_for_memref_referenced_p): New.
	(memref_referenced_p): Add new param.  Use
	process_set_for_memref_referenced_p.  Add new switch cases.
	(memref_used_between_p): Pass new arg to memref_referenced_p.

From-SVN: r268280
This commit is contained in:
Vladimir Makarov 2019-01-25 22:13:43 +00:00 committed by Vladimir Makarov
parent 6edee4b3d3
commit cc30d932d4
2 changed files with 73 additions and 24 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2019-01-25 Vladimir Makarov <vmakarov@redhat.com>
PR rtl-optimization/888846
* ira.c (process_set_for_memref_referenced_p): New.
(memref_referenced_p): Add new param. Use
process_set_for_memref_referenced_p. Add new switch cases.
(memref_used_between_p): Pass new arg to memref_referenced_p.
2019-01-25 Richard Earnshaw <rearnsha@arm.com>
PR target/88469

89
gcc/ira.c
View File

@ -3140,10 +3140,30 @@ equiv_init_movable_p (rtx x, int regno)
return 1;
}
/* TRUE if X references a memory location that would be affected by a store
to MEMREF. */
static int
memref_referenced_p (rtx memref, rtx x)
static bool memref_referenced_p (rtx memref, rtx x, bool read_p);
/* Auxiliary function for memref_referenced_p. Process setting X for
MEMREF store. */
static bool
process_set_for_memref_referenced_p (rtx memref, rtx x)
{
/* If we are setting a MEM, it doesn't count (its address does), but any
other SET_DEST that has a MEM in it is referencing the MEM. */
if (MEM_P (x))
{
if (memref_referenced_p (memref, XEXP (x, 0), true))
return true;
}
else if (memref_referenced_p (memref, x, false))
return true;
return false;
}
/* TRUE if X references a memory location (as a read if READ_P) that
would be affected by a store to MEMREF. */
static bool
memref_referenced_p (rtx memref, rtx x, bool read_p)
{
int i, j;
const char *fmt;
@ -3159,30 +3179,51 @@ memref_referenced_p (rtx memref, rtx x)
case CC0:
case HIGH:
case LO_SUM:
return 0;
return false;
case REG:
return (reg_equiv[REGNO (x)].replacement
&& memref_referenced_p (memref,
reg_equiv[REGNO (x)].replacement));
reg_equiv[REGNO (x)].replacement, read_p));
case MEM:
if (true_dependence (memref, VOIDmode, x))
return 1;
/* Memory X might have another effective type than MEMREF. */
if (read_p || true_dependence (memref, VOIDmode, x))
return true;
break;
case SET:
/* If we are setting a MEM, it doesn't count (its address does), but any
other SET_DEST that has a MEM in it is referencing the MEM. */
if (MEM_P (SET_DEST (x)))
{
if (memref_referenced_p (memref, XEXP (SET_DEST (x), 0)))
return 1;
}
else if (memref_referenced_p (memref, SET_DEST (x)))
return 1;
if (process_set_for_memref_referenced_p (memref, SET_DEST (x)))
return true;
return memref_referenced_p (memref, SET_SRC (x));
return memref_referenced_p (memref, SET_SRC (x), true);
case CLOBBER:
case CLOBBER_HIGH:
if (process_set_for_memref_referenced_p (memref, XEXP (x, 0)))
return true;
return false;
case PRE_DEC:
case POST_DEC:
case PRE_INC:
case POST_INC:
if (process_set_for_memref_referenced_p (memref, XEXP (x, 0)))
return true;
return memref_referenced_p (memref, XEXP (x, 0), true);
case POST_MODIFY:
case PRE_MODIFY:
/* op0 = op0 + op1 */
if (process_set_for_memref_referenced_p (memref, XEXP (x, 0)))
return true;
if (memref_referenced_p (memref, XEXP (x, 0), true))
return true;
return memref_referenced_p (memref, XEXP (x, 1), true);
default:
break;
@ -3193,17 +3234,17 @@ memref_referenced_p (rtx memref, rtx x)
switch (fmt[i])
{
case 'e':
if (memref_referenced_p (memref, XEXP (x, i)))
return 1;
if (memref_referenced_p (memref, XEXP (x, i), read_p))
return true;
break;
case 'E':
for (j = XVECLEN (x, i) - 1; j >= 0; j--)
if (memref_referenced_p (memref, XVECEXP (x, i, j)))
return 1;
if (memref_referenced_p (memref, XVECEXP (x, i, j), read_p))
return true;
break;
}
return 0;
return false;
}
/* TRUE if some insn in the range (START, END] references a memory location
@ -3224,7 +3265,7 @@ memref_used_between_p (rtx memref, rtx_insn *start, rtx_insn *end)
if (!NONDEBUG_INSN_P (insn))
continue;
if (memref_referenced_p (memref, PATTERN (insn)))
if (memref_referenced_p (memref, PATTERN (insn), false))
return 1;
/* Nonconst functions may access memory. */