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simplify-rtx.c (simplify_replace_fn_rtx): Add a fallback case for rtxes that aren't handled specially.

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gcc/
	* simplify-rtx.c (simplify_replace_fn_rtx): Add a fallback case
	for rtxes that aren't handled specially.

From-SVN: r153476
This commit is contained in:
Richard Sandiford 2009-10-22 22:30:27 +00:00 • committed by Richard Sandiford
parent bd7960b1e4
commit 4fb296d9f0
2 changed files with 47 additions and 3 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2009-10-22 Richard Sandiford <rdsandiford@googlemail.com>
* simplify-rtx.c (simplify_replace_fn_rtx): Add a fallback case
for rtxes that aren't handled specially.
2009-10-22 Richard Sandiford <rdsandiford@googlemail.com>
* rtl.h (shallow_copy_rtvec): Declare.

45
gcc/simplify-rtx.c
View file

@ -363,7 +363,10 @@ simplify_replace_fn_rtx (rtx x, const_rtx old_rtx,
enum rtx_code code = GET_CODE (x);
enum machine_mode mode = GET_MODE (x);
enum machine_mode op_mode;
rtx op0, op1, op2;
const char *fmt;
rtx op0, op1, op2, newx, op;
rtvec vec, newvec;
int i, j;
/* If X is OLD_RTX, return FN (X, DATA), with a null FN. Otherwise,
if this is an expression, try to build a new expression, substituting
@ -420,7 +423,6 @@ simplify_replace_fn_rtx (rtx x, const_rtx old_rtx,
return simplify_gen_ternary (code, mode, op_mode, op0, op1, op2);
case RTX_EXTRA:
/* The only case we try to handle is a SUBREG. */
if (code == SUBREG)
{
op0 = simplify_replace_fn_rtx (SUBREG_REG (x), old_rtx, fn, data);
@ -459,7 +461,44 @@ simplify_replace_fn_rtx (rtx x, const_rtx old_rtx,
default:
break;
}
return x;
newx = x;
fmt = GET_RTX_FORMAT (code);
for (i = 0; fmt[i]; i++)
switch (fmt[i])
{
case 'E':
vec = XVEC (x, i);
newvec = XVEC (newx, i);
for (j = 0; j < GET_NUM_ELEM (vec); j++)
{
op = simplify_replace_fn_rtx (RTVEC_ELT (vec, j),
old_rtx, fn, data);
if (op != RTVEC_ELT (vec, j))
{
if (newvec == vec)
{
newvec = shallow_copy_rtvec (vec);
if (x == newx)
newx = shallow_copy_rtx (x);
XVEC (newx, i) = newvec;
}
RTVEC_ELT (newvec, j) = op;
}
}
break;
case 'e':
op = simplify_replace_fn_rtx (XEXP (x, i), old_rtx, fn, data);
if (op != XEXP (x, i))
{
if (x == newx)
newx = shallow_copy_rtx (x);
XEXP (newx, i) = op;
}
break;
}
return newx;
}
/* Replace all occurrences of OLD_RTX in X with NEW_RTX and try to simplify the