[X86] Remove Undef handling from extractSubVector. This is now handled inside getNode.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@292877 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 2b58c02..418cda6 100644 (file)
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -4844,10 +4844,6 @@ static SDValue extractSubVector(SDValue Vec, unsigned IdxVal, SelectionDAG &DAG,
   EVT ResultVT = EVT::getVectorVT(*DAG.getContext(), ElVT,
                                   VT.getVectorNumElements()/Factor);
 
-  // Extract from UNDEF is UNDEF.
-  if (Vec.isUndef())
-    return DAG.getUNDEF(ResultVT);
-
   // Extract the relevant vectorWidth bits.  Generate an EXTRACT_SUBVECTOR
   unsigned ElemsPerChunk = vectorWidth / ElVT.getSizeInBits();
   assert(isPowerOf2_32(ElemsPerChunk) && "Elements per chunk not power of 2");