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Chris Lattner
120347e8d1
Strength reduce SAR into SHR if there is no way sign bits could be shifted
in. This tends to get cases like this: X = cast ubyte to int Y = shr int X, ... Tested by: shift.ll:test24 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21775 91177308-0d34-0410-b5e6-96231b3b80d8
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