[PATCH] D125754: [LoopUnroll] Avoid branch on poison with multiple exits
Nikita Popov via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Tue May 17 02:32:08 PDT 2022
nikic created this revision.
nikic added reviewers: fhahn, nlopes, reames.
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When performing runtime unrolling with multiple exits, one of the earlier (non-latch) exits may exit the loop on the first iteration, such that we never branch on the latch exit condition. As such, we need to freeze the condition of the new branch that is introduced before the loop, as it now executed unconditionally.
https://reviews.llvm.org/D125754
Files:
llvm/lib/Transforms/Utils/LoopUnrollRuntime.cpp
llvm/test/Transforms/LoopUnroll/runtime-loop-at-most-two-exits.ll
llvm/test/Transforms/LoopUnroll/runtime-loop-multiexit-dom-verify.ll
llvm/test/Transforms/LoopUnroll/runtime-loop-multiple-exits.ll
llvm/test/Transforms/LoopUnroll/runtime-multiexit-heuristic.ll
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