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[SimplifyCFGPass] mergeEmptyReturnBlocks(): skip blocks scheduled for removal as per DomTreeUpdater

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Thus supporting lazy DomTreeUpdater mode,
where the domtree updates (and thus block removals)
aren't applied immediately, but are delayed
until last possible moment.
This commit is contained in:
Roman Lebedev 2021-01-12 00:35:15 +03:00
parent ef53c50f1a
commit 0938d81acb
1 changed files with 3 additions and 2 deletions
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5
lib/Transforms/Scalar/SimplifyCFGPass.cpp
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@ -86,8 +86,9 @@ static bool mergeEmptyReturnBlocks(Function &F, DomTreeUpdater *DTU) {
BasicBlock *RetBlock = nullptr;
// Scan all the blocks in the function, looking for empty return blocks.
for (Function::iterator BBI = F.begin(), E = F.end(); BBI != E; ) {
BasicBlock &BB = *BBI++;
for (BasicBlock &BB : make_early_inc_range(F)) {
if (DTU && DTU->isBBPendingDeletion(&BB))
continue;
// Only look at return blocks.
ReturnInst *Ret = dyn_cast<ReturnInst>(BB.getTerminator());