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[Bug tree-optimization/13827] (a & b) != (c & b) should be transformed to ((a^c) & b) !=0
- From: "sayle at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 12 Nov 2006 18:41:44 -0000
- Subject: [Bug tree-optimization/13827] (a & b) != (c & b) should be transformed to ((a^c) & b) !=0
- References: <bug-13827-361@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #4 from sayle at gcc dot gnu dot org 2006-11-12 18:41 -------
Subject: Bug 13827
Author: sayle
Date: Sun Nov 12 18:41:31 2006
New Revision: 118727
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=118727
Log:
PR tree-optimization/13827
* fold-const.c (fold_binary) <EQ_EXPR, NE_EXPR>: Fold (X&C) op (Y&C)
as ((X^Y)&C) op 0.
* gcc.dg/fold-eqand-1.c: New test case.
Added:
trunk/gcc/testsuite/gcc.dg/fold-eqand-1.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/fold-const.c
trunk/gcc/testsuite/ChangeLog
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13827