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d8319655f2
The usual CodeGenPrepare trickery, on a target-specific intrinsic. Without this, the expansion of atomics will usually have the zext be hoisted out of the loop, defeating the various patterns we have to catch this precise case. Differential Revision: http://reviews.llvm.org/D9930 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238054 91177308-0d34-0410-b5e6-96231b3b80d8
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