diff options
| author | Chris Lattner <sabre@nondot.org> | 2008-11-28 19:54:49 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2008-11-28 19:54:49 +0000 |
| commit | f5102a0f088e7c96f7028bf7ca1c24975c314fff (patch) | |
| tree | 112c00bfeacfd18dbf355f8fc8c56664f43f11e7 /lib/Transforms/Scalar/JumpThreading.cpp | |
| parent | c6dbe7fbad79eddb030a4450a135d13e6b0ca942 (diff) | |
don't call MergeBasicBlockIntoOnlyPred on a block whose only
predecessor is itself. This doesn't make sense, and this is
a dead infinite loop anyway.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60210 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms/Scalar/JumpThreading.cpp')
| -rw-r--r-- | lib/Transforms/Scalar/JumpThreading.cpp | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/Transforms/Scalar/JumpThreading.cpp b/lib/Transforms/Scalar/JumpThreading.cpp index 5de5fb3b77..114603dabb 100644 --- a/lib/Transforms/Scalar/JumpThreading.cpp +++ b/lib/Transforms/Scalar/JumpThreading.cpp @@ -164,7 +164,8 @@ bool JumpThreading::ProcessBlock(BasicBlock *BB) { // because now the condition in this block can be threaded through // predecessors of our predecessor block. if (BasicBlock *SinglePred = BB->getSinglePredecessor()) - if (SinglePred->getTerminator()->getNumSuccessors() == 1) { + if (SinglePred->getTerminator()->getNumSuccessors() == 1 && + SinglePred != BB) { // Remember if SinglePred was the entry block of the function. If so, we // will need to move BB back to the entry position. bool isEntry = SinglePred == &SinglePred->getParent()->getEntryBlock(); |