diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 6d2827e8574..c7f22dd3627 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -2955,8 +2955,8 @@ KnownBits SelectionDAG::computeKnownBits(SDValue Op, const APInt &DemandedElts,
         Known2 = computeKnownBits(N0, SubDemandedElts.shl(i),
                          Depth + 1);
         unsigned Shifts = IsLE ? i : SubScale - 1 - i;
-        Known.One |= Known2.One.zext(BitWidth).shl(SubBitWidth * Shifts);
-        Known.Zero |= Known2.Zero.zext(BitWidth).shl(SubBitWidth * Shifts);
+        Known.One.insertBits(Known2.One, SubBitWidth * Shifts);
+        Known.Zero.insertBits(Known2.Zero, SubBitWidth * Shifts);
       }
     }