[X86] Added TODO comment for target shuffle mask decoding of bitcasted masks

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@266559 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/X86/X86ISelLowering.cpp

@@ -4817,6 +4817,7 @@ static bool getTargetShuffleMaskIndices(SDValue MaskNode,
   if (MaskNode.getOpcode() != ISD::BUILD_VECTOR)
     return false;
 
+  // TODO: Handle (MaskEltSizeInBits % VT.getScalarSizeInBits()) == 0
   if ((VT.getScalarSizeInBits() % MaskEltSizeInBits) != 0)
     return false;
   unsigned ElementSplit = VT.getScalarSizeInBits() / MaskEltSizeInBits;