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This patch is a partial revert of https://llvm.org/svn/llvm-project/llvm/trunk@237793. Extra "and" causes performance degradation. We assume that i1 is stored in zero-extended form. And store operation is responsible for zeroing upper bits. Differential Revision: http://reviews.llvm.org/D17541 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@261828 91177308-0d34-0410-b5e6-96231b3b80d8