[SelectionDAG] Replace a flag that can never be true with an assert.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@313847 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/SelectionDAG/TargetLowering.cpp b/lib/CodeGen/SelectionDAG/TargetLowering.cpp
index 3f658fa0376a41ff3992911fc5658871f555e7dc..4004d69c5804c387981b9ddc15084e3053f64635 100644 (file)
--- a/lib/CodeGen/SelectionDAG/TargetLowering.cpp
+++ b/lib/CodeGen/SelectionDAG/TargetLowering.cpp
@@ -421,9 +421,8 @@ bool TargetLowering::ShrinkDemandedOp(SDValue Op, unsigned BitWidth,
           Op.getOpcode(), dl, SmallVT,
           DAG.getNode(ISD::TRUNCATE, dl, SmallVT, Op.getOperand(0)),
           DAG.getNode(ISD::TRUNCATE, dl, SmallVT, Op.getOperand(1)));
-      bool NeedZext = DemandedSize > SmallVTBits;
-      SDValue Z = DAG.getNode(NeedZext ? ISD::ZERO_EXTEND : ISD::ANY_EXTEND,
-                              dl, Op.getValueType(), X);
+      assert(DemandedSize <= SmallVTBits && "Narrowed below demanded bits?");
+      SDValue Z = DAG.getNode(ISD::ANY_EXTEND, dl, Op.getValueType(), X);
       return TLO.CombineTo(Op, Z);
     }
   }