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Commit c44160ce authored by Chris Lattner's avatar Chris Lattner
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Teach masked value is zero about add and sub, and use MVIZ to 

simplify things like (X & 4) >> 1 == 2  --> (X & 4) == 4.

since it is obvious that the shift doesn't remove any bits.

llvm-svn: 48631
parent 92b44882
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