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improve comment.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86723 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-11-10 21:45:09 +00:00
parent f3183f6da6
commit 6f84a5feee
1 changed files with 5 additions and 2 deletions
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7
lib/Transforms/Scalar/JumpThreading.cpp
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@ -142,11 +142,14 @@ bool JumpThreading::runOnFunction(Function &F) {
++BBI;
// If the terminator is the only non-phi instruction, try to nuke it.
if (BBI->isTerminator()) {
bool Erased = LoopHeaders.erase(BB);
// Since TryToSimplifyUncondBranchFromEmptyBlock may delete the
// block, we have to make sure it isn't in the LoopHeaders set. We
// reinsert afterward in the rare case when the block isn't deleted.
bool ErasedFromLoopHeaders = LoopHeaders.erase(BB);
if (TryToSimplifyUncondBranchFromEmptyBlock(BB))
Changed = true;
else if (Erased)
else if (ErasedFromLoopHeaders)
LoopHeaders.insert(BB);
}
}