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7c5c9b39c9
It enables to work with a smaller constant, which is target friendly for those which can compare to immediates. It also avoids inserting a shift in favor of a trunc, which can be free on some targets. This used to work until LLVM-3.1, but regressed with the 3.2 release. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175270 91177308-0d34-0410-b5e6-96231b3b80d8
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