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ea57433cee
Estimate the cyclic critical path within a single block loop. If the acyclic critical path is longer, then the loop will exhaust OOO resources after some number of iterations. If lag between the acyclic critical path and cyclic critical path is longer the the time it takes to issue those loop iterations, then aggressively schedule for latency. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189120 91177308-0d34-0410-b5e6-96231b3b80d8
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