1 files changed, 4 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp b/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
index f2bc88a9859..45748d59443 100644
--- a/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
@@ -1468,6 +1468,10 @@ SDValue TargetLowering::SimplifySetCC(EVT VT, SDValue N0, SDValue N1,
         if (isTypeDesirableForOp(ISD::SETCC, MinVT)) {
           // Will get folded away.
           SDValue Trunc = DAG.getNode(ISD::TRUNCATE, dl, MinVT, PreExt);
+          if (MinBits == 1 && C1 == 1)
+            // Invert the condition.
+            return DAG.getSetCC(dl, VT, Trunc, DAG.getConstant(0, dl, MVT::i1),
+                                Cond == ISD::SETEQ ? ISD::SETNE : ISD::SETEQ);
           SDValue C = DAG.getConstant(C1.trunc(MinBits), dl, MinVT);
           return DAG.getSetCC(dl, VT, Trunc, C, Cond);
         }