Index: lib/Target/X86/X86ISelLowering.cpp
===================================================================
--- lib/Target/X86/X86ISelLowering.cpp
+++ lib/Target/X86/X86ISelLowering.cpp
@@ -11090,7 +11090,6 @@
   unsigned NumLanes = (NumElems - 1) / 8 + 1;
   unsigned NumElemsInLane = NumElems / NumLanes;
 
-  // Blend for v16i16 should be symmetric for the both lanes.
   for (unsigned i = 0; i < NumElemsInLane; ++i) {
     SDValue EltCond = BuildVector->getOperand(i);
     SDValue SndLaneEltCond =
@@ -11102,16 +11101,16 @@
     if (isa<ConstantSDNode>(SndLaneEltCond))
       Lane2Cond = !isZero(SndLaneEltCond);
 
-    if (Lane1Cond == Lane2Cond || Lane2Cond < 0)
-      // Lane1Cond != 0, means we want the first argument.
-      // Lane1Cond == 0, means we want the second argument.
-      // The encoding of this argument is 0 for the first argument, 1
-      // for the second. Therefore, invert the condition.
-      MaskValue |= !Lane1Cond << i;
-    else if (Lane1Cond < 0)
-      MaskValue |= !Lane2Cond << i;
-    else
+    // Blend for v16i16 should be symmetric for the both lanes.
+    if (Lane1Cond != Lane2Cond)
       return false;
+
+    // Lane1Cond != 0, means we want the first argument.
+    // Lane1Cond == 0, means we want the second argument.
+    // The encoding of this argument is 0 for the first argument, 1
+    // for the second. Therefore, invert the condition.
+    MaskValue |= !Lane1Cond << i;
+    MaskValue |= !Lane2Cond << (i + NumElemsInLane);
   }
   return true;
 }