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The current code normalizes select(C0, x, select(C1, x, y)) towards select(C0|C1, x, y) if the targets prefers that form. This patch adds an additional rule that if the select(C1, x, y) part already exists in the function then we want to normalize into the other direction because the effects of reusing the existing value are bigger than transforming into the target preferred form. This addresses regressions following r238793, see also: http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20150727/290272.html Differential Revision: http://reviews.llvm.org/D11616 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@245350 91177308-0d34-0410-b5e6-96231b3b80d8
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