Fix another instance where PHI nodes need special treatment.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28774 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 6 insertions, 0 deletions

diff --git a/lib/Transforms/Utils/LCSSA.cpp b/lib/Transforms/Utils/LCSSA.cpp
index 37ab7ee7ff..3c70f735e8 100644
--- a/lib/Transforms/Utils/LCSSA.cpp
+++ b/lib/Transforms/Utils/LCSSA.cpp
@@ -215,6 +215,12 @@ void LCSSA::processInstruction(Instruction* Instr,
   for (Instruction::use_iterator UI = Instr->use_begin(), UE = Instr->use_end();
        UI != UE; ++UI) {
     Instruction* use = cast<Instruction>(*UI);
+    BasicBlock* UserBB = use->getParent();
+    if (PHINode* p = dyn_cast<PHINode>(use)) {
+      unsigned OperandNo = UI.getOperandNo();
+      UserBB = p->getIncomingBlock(OperandNo/2);
+    }
+    
     // Don't need to update uses within the loop body.
     if (!inLoop(use->getParent()))
       Uses.push_back(use);