recommit r108131 (hich has been backed out in r108135) with a fix

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108137 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 3 insertions, 2 deletions

diff --git a/lib/Transforms/Scalar/TailDuplication.cpp b/lib/Transforms/Scalar/TailDuplication.cpp
index 2306a77670..9208238f4b 100644
--- a/lib/Transforms/Scalar/TailDuplication.cpp
+++ b/lib/Transforms/Scalar/TailDuplication.cpp
@@ -206,12 +206,13 @@ static BasicBlock *FindObviousSharedDomOf(BasicBlock *SrcBlock,
   // there is only one other pred, get it, otherwise we can't handle it.
   PI = pred_begin(DstBlock); PE = pred_end(DstBlock);
   BasicBlock *DstOtherPred = 0;
-  if (*PI == SrcBlock) {
+  BasicBlock *P = *PI;
+  if (P == SrcBlock) {
     if (++PI == PE) return 0;
     DstOtherPred = *PI;
     if (++PI != PE) return 0;
   } else {
-    DstOtherPred = *PI;
+    DstOtherPred = P;
     if (++PI == PE || *PI != SrcBlock || ++PI != PE) return 0;
   }