Fix a bug that was causing GVN to crash on 252.eon.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40494 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/GVN.cpp b/lib/Transforms/Scalar/GVN.cpp
index 3b8adef..a08ee68 100644
--- a/lib/Transforms/Scalar/GVN.cpp
+++ b/lib/Transforms/Scalar/GVN.cpp
@@ -714,8 +714,15 @@
unsigned numPreds = std::distance(pred_begin(BB), pred_end(BB));
if (numPreds == 1) {
- Phis[BB] = Phis[*pred_begin(BB)];
- return Phis[BB];
+ DenseMap<BasicBlock*, Value*>::iterator DI = Phis.find(BB);
+ if (DI != Phis.end()) {
+ Phis.insert(std::make_pair(BB, DI->second));
+ return DI->second;
+ } else {
+ Value* domV = performPHIConstruction(*pred_begin(BB), orig, Phis);
+ Phis.insert(std::make_pair(BB, domV));
+ return domV;
+ }
} else {
PHINode *PN = new PHINode(orig->getType(), orig->getName()+".rle", BB->begin());
PN->reserveOperandSpace(numPreds);