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LGTM. I will commit. On Oct 10, 2012, at 1:20 PM, Shuxin Yang <shuxin.llvm at gmail.com> wrote: > Hi, > > The attached is the fix to radar://11663049. The optimization can be outlined by following rules: > > (select (x != c), e, c) -> select (x != c), e, x), > (select (x == c), c, e) -> select (x == c), x, e) > where the <c> is an integer

Hi, The attached is the fix to radar://11663049. The optimization can be outlined by following rules: (select (x != c), e, c) -> select (x != c), e, x), (select (x == c), c, e) -> select (x == c), x, e) where the <c> is an integer constant. The reason for this change is that : on x86, conditional-move-from-constant needs two instructions; however,