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2 Commits

Author SHA1 Message Date
Dan Gohman
820528331f Teach ScalarEvolution how to recognize another xor(and(x, C), C) case. 
If C is a single bit and the and gets analyzed as a truncate and
zero-extend, the xor can be represnted as an add.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73664 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-06-18 00:00:20 +00:00
Dan Gohman
3034c10675 Fix ScalarEvolution's Xor handling to not assume that an And 
that gets recognized with a SCEVZeroExtendExpr must be an And
with a low-bits mask. With r73540, this is no longer the case.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73594 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-06-17 01:22:39 +00:00