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Commit 7a69d2c0 authored by David Majnemer's avatar David Majnemer
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ValueTracking: Teach isKnownToBeAPowerOfTwo about (ADD X, (XOR X, Y)) where X is a power of two 

This allows us to simplify urem instructions involving the add+xor to
turn into simpler math.

llvm-svn: 185272
parent 3cc579a9
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