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This patch peels off the top case in switch statement into a branch if the probability exceeds a threshold. This will help the branch prediction and avoids the extra compares when lowering into chain of branches. Differential Revision: http://reviews.llvm.org/D39262 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@318202 91177308-0d34-0410-b5e6-96231b3b80d8
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