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Runtime unrollng will introduce a runtime check in loop prologue. If the unrolled loop is a inner loop, then the proglogue will be inside the outer loop. LICM pass can help to promote the runtime check out if the checked value is loop invariant. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231630 91177308-0d34-0410-b5e6-96231b3b80d8
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