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[NFCI][LoopDeletion] Do not call complex analysis for known non-zero BTC

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This commit is contained in:
Max Kazantsev 2021-05-27 15:18:30 +07:00
parent 8529f1644f
commit fb6b06d635
1 changed files with 2 additions and 0 deletions
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2
lib/Transforms/Scalar/LoopDeletion.cpp
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@ -343,6 +343,8 @@ breakBackedgeIfNotTaken(Loop *L, DominatorTree &DT, ScalarEvolution &SE,
return LoopDeletionResult::Unmodified;
auto *BTC = SE.getBackedgeTakenCount(L);
if (!isa<SCEVCouldNotCompute>(BTC) && SE.isKnownNonZero(BTC))
return LoopDeletionResult::Unmodified;
if (!BTC->isZero() && !canProveExitOnFirstIteration(L, DT, SE, LI))
return LoopDeletionResult::Unmodified;