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[LoopUnrollRuntime] Remove unnecessary pointer BECount check (NFC) 

BECounts are guaranteed to be integers nowadays.
This commit is contained in:
Nikita Popov 2021-12-01 10:32:37 +01:00
parent 67704801c6
commit 84b978da3b
1 changed files with 2 additions and 4 deletions
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6
llvm/lib/Transforms/Utils/LoopUnrollRuntime.cpp
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@ -623,15 +623,13 @@ bool llvm::UnrollRuntimeLoopRemainder(
if (!SE)
return false;
// Only unroll loops with a computable trip count, and the trip count needs
// to be an int value (allowing a pointer type is a TODO item).
// Only unroll loops with a computable trip count.
// We calculate the backedge count by using getExitCount on the Latch block,
// which is proven to be the only exiting block in this loop. This is same as
// calculating getBackedgeTakenCount on the loop (which computes SCEV for all
// exiting blocks).
const SCEV *BECountSC = SE->getExitCount(L, Latch);
if (isa<SCEVCouldNotCompute>(BECountSC) ||
!BECountSC->getType()->isIntegerTy()) {
if (isa<SCEVCouldNotCompute>(BECountSC)) {
LLVM_DEBUG(dbgs() << "Could not compute exit block SCEV\n");
return false;
}