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[LoopVectorize] Remove redundant code in emitSCEVChecks #111132

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Oct 7, 2024
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[LoopVectorize] Remove redundant code in emitSCEVChecks #111132

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14 changes: 2 additions & 12 deletions llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2486,18 +2486,8 @@ BasicBlock *InnerLoopVectorizer::emitSCEVChecks(BasicBlock *Bypass) {
(OptForSizeBasedOnProfile &&
Cost->Hints->getForce() != LoopVectorizeHints::FK_Enabled)) &&
"Cannot SCEV check stride or overflow when optimizing for size");


// Update dominator only if this is first RT check.
if (LoopBypassBlocks.empty()) {
DT->changeImmediateDominator(Bypass, SCEVCheckBlock);
if (!Cost->requiresScalarEpilogue(VF.isVector()))
// If there is an epilogue which must run, there's no edge from the
// middle block to exit blocks and thus no need to update the immediate
// dominator of the exit blocks.
DT->changeImmediateDominator(LoopExitBlock, SCEVCheckBlock);
}

assert(!LoopBypassBlocks.empty() &&
"Should already be a bypass block due to iteration count check");
LoopBypassBlocks.push_back(SCEVCheckBlock);
AddedSafetyChecks = true;
return SCEVCheckBlock;
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