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simplify-rtx.c (simplify_binary_operation): Simplify ~y when (x - (x & y)) is found.

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* simplify-rtx.c (simplify_binary_operation): Simplify ~y when
	(x - (x & y)) is found.

From-SVN: r62906
This commit is contained in:
Kazu Hirata 2003-02-14 17:50:30 +00:00 committed by Kazu Hirata
parent b8c86c6d07
commit 6017c7192b
2 changed files with 15 additions and 4 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2003-02-14 Kazu Hirata <kazu@cs.umass.edu>
* simplify-rtx.c (simplify_binary_operation): Simplify ~y when
(x - (x & y)) is found.
2003-02-14 Rainer Orth <ro@TechFak.Uni-Bielefeld.DE>
* configure.in: Fix typo.

14
gcc/simplify-rtx.c
View File

@ -1338,11 +1338,17 @@ simplify_binary_operation (code, mode, op0, op1)
if (GET_CODE (op1) == AND)
{
if (rtx_equal_p (op0, XEXP (op1, 0)))
return simplify_gen_binary (AND, mode, op0,
gen_rtx_NOT (mode, XEXP (op1, 1)));
{
tem = simplify_gen_unary (NOT, mode, XEXP (op1, 1),
GET_MODE (XEXP (op1, 1)));
return simplify_gen_binary (AND, mode, op0, tem);
}
if (rtx_equal_p (op0, XEXP (op1, 1)))
return simplify_gen_binary (AND, mode, op0,
gen_rtx_NOT (mode, XEXP (op1, 0)));
{
tem = simplify_gen_unary (NOT, mode, XEXP (op1, 0),
GET_MODE (XEXP (op1, 0)));
return simplify_gen_binary (AND, mode, op0, tem);
}
}
break;