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[LoopPred] Stylistic improvement to recently added NE/EQ normalization [NFC]

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llvm-svn: 365425
This commit is contained in:
Philip Reames 2019-07-09 02:03:31 +00:00
parent 61809186ed
commit 38489eb344
1 changed files with 5 additions and 9 deletions
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14
lib/Transforms/Scalar/LoopPredication.cpp
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@ -647,17 +647,13 @@ Optional<Value *> LoopPredication::widenICmpRangeCheckDecrementingLoop(
static void normalizePredicate(ScalarEvolution *SE, Loop *L,
LoopICmp& RC) {
// LFTR canonicalizes checks to the ICMP_NE form instead of an ULT/SLT form.
// Normalize back to the ULT/SLT form for ease of handling.
if (RC.Pred == ICmpInst::ICMP_NE &&
// LFTR canonicalizes checks to the ICMP_NE/EQ form; normalize back to the
// ULT/UGE form for ease of handling by our caller.
if (ICmpInst::isEquality(RC.Pred) &&
RC.IV->getStepRecurrence(*SE)->isOne() &&
SE->isKnownPredicate(ICmpInst::ICMP_ULE, RC.IV->getStart(), RC.Limit))
RC.Pred = ICmpInst::ICMP_ULT;
if (RC.Pred == ICmpInst::ICMP_EQ &&
RC.IV->getStepRecurrence(*SE)->isOne() &&
SE->isKnownPredicate(ICmpInst::ICMP_ULE, RC.IV->getStart(), RC.Limit))
RC.Pred = ICmpInst::ICMP_UGE;
RC.Pred = RC.Pred == ICmpInst::ICMP_NE ?
ICmpInst::ICMP_ULT : ICmpInst::ICMP_UGE;
}