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| author | Chris Lattner <sabre@nondot.org> | 2009-12-06 17:17:23 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2009-12-06 17:17:23 +0000 |
| commit | 08bc2701a22cae61d202c0960a390d8410434e5c (patch) | |
| tree | d9afc9714036336654c968008d29d7bbdc533a0a /lib/Transforms/Scalar/JumpThreading.cpp | |
| parent | 9000242cca4431a8dd09c83459d56f164294582c (diff) | |
fix PR5698
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90708 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms/Scalar/JumpThreading.cpp')
| -rw-r--r-- | lib/Transforms/Scalar/JumpThreading.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/Transforms/Scalar/JumpThreading.cpp b/lib/Transforms/Scalar/JumpThreading.cpp index 1b93f3441e..d58b9c9de0 100644 --- a/lib/Transforms/Scalar/JumpThreading.cpp +++ b/lib/Transforms/Scalar/JumpThreading.cpp @@ -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. |