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Fix PR3353, infinitely jump threading an infinite loop make from switches.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62529 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2009-01-19 21:20:34 +00:00
parent 1f54f58e64
commit 2c7ed11d93
2 changed files with 26 additions and 0 deletions
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5
lib/Transforms/Scalar/JumpThreading.cpp
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@@ -419,6 +419,11 @@ bool JumpThreading::ProcessBranchOnDuplicateCond(BasicBlock *PredBB,
/// switches out of repeated 'if' conditions.
bool JumpThreading::ProcessSwitchOnDuplicateCond(BasicBlock *PredBB,
BasicBlock *DestBB) {
// Can't thread edge to self.
if (PredBB == DestBB)
return false;
SwitchInst *PredSI = cast<SwitchInst>(PredBB->getTerminator());
SwitchInst *DestSI = cast<SwitchInst>(DestBB->getTerminator());