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| author | Benjamin Kramer <benny.kra@googlemail.com> | 2012-09-28 10:42:50 +0000 |
|---|---|---|
| committer | Benjamin Kramer <benny.kra@googlemail.com> | 2012-09-28 10:42:50 +0000 |
| commit | 8be16fe70395c30762081388b8f6df323ddc82eb (patch) | |
| tree | b329dbdf6fc2101abba78455220e91b73093b7e0 /lib/Transforms/Scalar/CorrelatedValuePropagation.cpp | |
| parent | 53347ed2f8b6a80a36b0450a13eaa44da983ac3d (diff) | |
| download | external_llvm-8be16fe70395c30762081388b8f6df323ddc82eb.zip external_llvm-8be16fe70395c30762081388b8f6df323ddc82eb.tar.gz external_llvm-8be16fe70395c30762081388b8f6df323ddc82eb.tar.bz2 | |
CorrelatedPropagation: BasicBlock::removePredecessor can simplify PHI nodes. If the it's the condition of a SwitchInst, reload it.
Fixes PR13972.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164818 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms/Scalar/CorrelatedValuePropagation.cpp')
| -rw-r--r-- | lib/Transforms/Scalar/CorrelatedValuePropagation.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/Transforms/Scalar/CorrelatedValuePropagation.cpp b/lib/Transforms/Scalar/CorrelatedValuePropagation.cpp index 9b0aadb..3ec6f3d 100644 --- a/lib/Transforms/Scalar/CorrelatedValuePropagation.cpp +++ b/lib/Transforms/Scalar/CorrelatedValuePropagation.cpp @@ -235,6 +235,11 @@ bool CorrelatedValuePropagation::processSwitch(SwitchInst *SI) { // This case never fires - remove it. CI.getCaseSuccessor()->removePredecessor(BB); SI->removeCase(CI); // Does not invalidate the iterator. + + // The condition can be modified by removePredecessor's PHI simplification + // logic. + Cond = SI->getCondition(); + ++NumDeadCases; Changed = true; } else if (State == LazyValueInfo::True) { |