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combine.c (simplify_comparison): Re-enable widening of comparisons with non-paradoxical subregs of non-REG...

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* combine.c (simplify_comparison): Re-enable widening of comparisons
	with non-paradoxical subregs of non-REG expressions.

From-SVN: r70785
This commit is contained in:
Ulrich Weigand 2003-08-25 21:11:46 +00:00 committed by Ulrich Weigand
parent ff619040ad
commit dc5c3188aa
2 changed files with 12 additions and 5 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2003-08-25 Ulrich Weigand <uweigand@de.ibm.com>
* combine.c (simplify_comparison): Re-enable widening of comparisons
with non-paradoxical subregs of non-REG expressions.
2003-08-25 Ulrich Weigand <uweigand@de.ibm.com>
* combine.c (distribute_notes): Handle REG_ALWAYS_RETURN.

12
gcc/combine.c
View File

@ -11277,9 +11277,6 @@ simplify_comparison (enum rtx_code code, rtx *pop0, rtx *pop1)
op1 = make_compound_operation (op1, SET);
if (GET_CODE (op0) == SUBREG && subreg_lowpart_p (op0)
/* Case 3 above, to sometimes allow (subreg (mem x)), isn't
implemented. */
&& GET_CODE (SUBREG_REG (op0)) == REG
&& GET_MODE_CLASS (GET_MODE (op0)) == MODE_INT
&& GET_MODE_CLASS (GET_MODE (SUBREG_REG (op0))) == MODE_INT
&& (code == NE || code == EQ))
@ -11287,8 +11284,13 @@ simplify_comparison (enum rtx_code code, rtx *pop0, rtx *pop1)
if (GET_MODE_SIZE (GET_MODE (op0))
> GET_MODE_SIZE (GET_MODE (SUBREG_REG (op0))))
{
op0 = SUBREG_REG (op0);
op1 = gen_lowpart_for_combine (GET_MODE (op0), op1);
/* For paradoxical subregs, allow case 1 as above. Case 3 isn't
implemented. */
if (GET_CODE (SUBREG_REG (op0)) == REG)
{
op0 = SUBREG_REG (op0);
op1 = gen_lowpart_for_combine (GET_MODE (op0), op1);
}
}
else if ((GET_MODE_BITSIZE (GET_MODE (SUBREG_REG (op0)))
<= HOST_BITS_PER_WIDE_INT)