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[IVUsers] Check LoopSimplify cache earlier (NFC)

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Check the cache before calling isLoopSimplifyForm(). Otherwise we'd
always perform the check for the innermost loop and only skip it
for dominating loops.
This commit is contained in:
Nikita Popov 2021-04-10 22:17:35 +02:00
parent 3e6a01ab89
commit 28b15148fb
1 changed files with 3 additions and 3 deletions
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6
lib/Analysis/IVUsers.cpp
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@ -101,12 +101,12 @@ static bool isSimplifiedLoopNest(BasicBlock *BB, const DominatorTree *DT,
BasicBlock *DomBB = Rung->getBlock();
Loop *DomLoop = LI->getLoopFor(DomBB);
if (DomLoop && DomLoop->getHeader() == DomBB) {
// If the domtree walk reaches a loop with no preheader, return false.
if (!DomLoop->isLoopSimplifyForm())
return false;
// If we have already checked this loop nest, stop checking.
if (SimpleLoopNests.count(DomLoop))
break;
// If the domtree walk reaches a loop with no preheader, return false.
if (!DomLoop->isLoopSimplifyForm())
return false;
// If we have not already checked this loop nest, remember the loop
// header nearest to BB. The nearest loop may not contain BB.
if (!NearestLoop)