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don't call MergeBasicBlockIntoOnlyPred on a block whose only

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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
This commit is contained in:
Chris Lattner
2008-11-28 19:54:49 +00:00
parent c6dbe7fbad
commit f5102a0f08
3 changed files with 30 additions and 10 deletions
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lib/Transforms/Scalar/JumpThreading.cpp
+2 -1
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@@ -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();