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combine.c (force_to_mode): Only convert the expression (AND (NE FOO 0) CONST) into (AND FOO CONST) if...

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* combine.c (force_to_mode) <NE_EXPR>: Only convert the expression
	(AND (NE FOO 0) CONST) into (AND FOO CONST) if FOO has the same
	machine mode as the result.

From-SVN: r88369
This commit is contained in:
Roger Sayle 2004-09-30 23:44:30 +00:00 committed by Roger Sayle
parent dc4f06d972
commit 7d103eb5d4
2 changed files with 7 additions and 0 deletions
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gcc/ChangeLog
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@ -1,3 +1,9 @@
2004-09-30 Roger Sayle <roger@eyesopen.com>
* combine.c (force_to_mode) <NE_EXPR>: Only convert the expression
(AND (NE FOO 0) CONST) into (AND FOO CONST) if FOO has the same
machine mode as the result.
2004-09-30 Ben Elliston <bje@au.ibm.com>
PR bootstrap/17761

1
gcc/combine.c
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@ -7338,6 +7338,7 @@ force_to_mode (rtx x, enum machine_mode mode, unsigned HOST_WIDE_INT mask,
in STORE_FLAG_VALUE and FOO has a single bit that might be nonzero,
which is equal to STORE_FLAG_VALUE. */
if ((mask & ~STORE_FLAG_VALUE) == 0 && XEXP (x, 1) == const0_rtx
&& GET_MODE (XEXP (x, 0)) == mode
&& exact_log2 (nonzero_bits (XEXP (x, 0), mode)) >= 0
&& (nonzero_bits (XEXP (x, 0), mode)
== (unsigned HOST_WIDE_INT) STORE_FLAG_VALUE))