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simplify-rtx.c (simplify_relational_operation_1): Avoid creating zero extensions of BImode operands.

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* simplify-rtx.c (simplify_relational_operation_1): Avoid creating
	zero extensions of BImode operands.  Call lowpart_subreg instead
	of gen_lowpart_common and gen_lowpart_SUBREG.

From-SVN: r94730
This commit is contained in:
Roger Sayle 2005-02-08 03:38:26 +00:00 committed by Roger Sayle
parent 6a8c830d8d
commit f8eacd975b
2 changed files with 10 additions and 11 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2005-02-07 Roger Sayle <roger@eyesopen.com>
* simplify-rtx.c (simplify_relational_operation_1): Avoid creating
zero extensions of BImode operands. Call lowpart_subreg instead
of gen_lowpart_common and gen_lowpart_SUBREG.
2005-02-07 Nathanael Nerode <neroden@gcc.gnu.org>
PR ada/19489

15
gcc/simplify-rtx.c
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@ -2886,19 +2886,12 @@ simplify_relational_operation_1 (enum rtx_code code, enum machine_mode mode,
&& op1 == const0_rtx
&& GET_MODE_CLASS (mode) == MODE_INT
&& cmp_mode != VOIDmode
&& cmp_mode != BImode
&& nonzero_bits (op0, cmp_mode) == 1
&& STORE_FLAG_VALUE == 1)
{
rtx tmp;
if (GET_MODE_SIZE (mode) > GET_MODE_SIZE (cmp_mode))
return simplify_gen_unary (ZERO_EXTEND, mode, op0, cmp_mode);
tmp = gen_lowpart_common (mode, op0);
if (tmp)
return tmp;
if (GET_MODE (op0) != mode)
return gen_lowpart_SUBREG (mode, op0);
return op0;
}
return GET_MODE_SIZE (mode) > GET_MODE_SIZE (cmp_mode)
? simplify_gen_unary (ZERO_EXTEND, mode, op0, cmp_mode)
: lowpart_subreg (mode, op0, cmp_mode);
return NULL_RTX;
}