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fix PR5698

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90708 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2009-12-06 17:17:23 +00:00
parent 9000242cca
commit 08bc2701a2
2 changed files with 27 additions and 0 deletions
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5
lib/Transforms/Scalar/JumpThreading.cpp
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@@ -718,6 +718,11 @@ bool JumpThreading::ProcessSwitchOnDuplicateCond(BasicBlock *PredBB,
if (PredSI->getSuccessor(PredCase) != DestBB &&
DestSI->getSuccessor(i) != DestBB)
continue;
// Do not forward this if it already goes to this destination, this would
// be an infinite loop.
if (PredSI->getSuccessor(PredCase) == DestSucc)
continue;
// Otherwise, we're safe to make the change. Make sure that the edge from
// DestSI to DestSucc is not critical and has no PHI nodes.