1 files changed, 9 insertions, 2 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
index e2e6691ba7c..5a833d335c1 100644
--- a/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
@@ -3535,9 +3535,16 @@ void SelectionDAGLegalize::ExpandNode(SDNode *Node,
                          Tmp2.getOperand(0), Tmp2.getOperand(1),
                          Node->getOperand(2));
     } else {
+      // We test only the i1 bit.  Skip the AND if UNDEF.
+      Tmp3 = (Tmp2.getOpcode() == ISD::UNDEF ||
+              (Tmp2.getOpcode() == ISD::AND &&
+               Tmp2.getConstantOperandVal(1) == 1)) ?
+        Tmp2 :
+        DAG.getNode(ISD::AND, dl, Tmp2.getValueType(), Tmp2,
+                    DAG.getConstant(1, Tmp2.getValueType()));
       Tmp1 = DAG.getNode(ISD::BR_CC, dl, MVT::Other, Tmp1,
-                         DAG.getCondCode(ISD::SETNE), Tmp2,
-                         DAG.getConstant(0, Tmp2.getValueType()),
+                         DAG.getCondCode(ISD::SETNE), Tmp3,
+                         DAG.getConstant(0, Tmp3.getValueType()),
                          Node->getOperand(2));
     }
     Results.push_back(Tmp1);