[X86][NFC]Remove dead code in X86ISelLowering.cpp

Look at the code in X86ISelLowering.cpp line 15579, when NumV2Elements == 0,
it has been handled in that scope, and will not move to the line 15612.

Reviewed By: RKSimon

Differential Revision: https://reviews.llvm.org/D146790

diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index b9ccb5b..c404eee 100644 (file)
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -15609,10 +15609,6 @@ static SDValue lowerV4I32Shuffle(const SDLoc &DL, ArrayRef<int> Mask,
           lowerShuffleAsShift(DL, MVT::v4i32, V1, V2, Mask, Zeroable, Subtarget,
                               DAG, /*BitwiseOnly*/ false))
     return Shift;
-  if (!Subtarget.preferLowerShuffleAsShift() && NumV2Elements == 0)
-    if (SDValue Rotate =
-            lowerShuffleAsBitRotate(DL, MVT::v4i32, V1, Mask, Subtarget, DAG))
-      return Rotate;
 
   // There are special ways we can lower some single-element blends.
   if (NumV2Elements == 1)