[X86] lowerShuffleAsBitMask - generalize FP handling. (#135345)

Don't explicitly handle f32/f64 cases - allow any fp value type and convert to equivalent int type with MVT::changeTypeToInteger

Author: RKSimon

llvm/lib/Target/X86/X86ISelLowering.cpp

@@ -10871,12 +10871,11 @@ static SDValue lowerShuffleAsBitMask(const SDLoc &DL, MVT VT, SDValue V1,
   }
 
   MVT LogicVT = VT;
-  if (EltVT == MVT::f32 || EltVT == MVT::f64) {
+  if (EltVT.isFloatingPoint()) {
     Zero = DAG.getConstantFP(0.0, DL, EltVT);
     APFloat AllOnesValue = APFloat::getAllOnesValue(EltVT.getFltSemantics());
     AllOnes = DAG.getConstantFP(AllOnesValue, DL, EltVT);
-    LogicVT =
-        MVT::getVectorVT(EltVT == MVT::f64 ? MVT::i64 : MVT::i32, Mask.size());
+    LogicVT = MVT::getVectorVT(EltVT.changeTypeToInteger(), Mask.size());
   } else {
     Zero = DAG.getConstant(0, DL, EltVT);
     AllOnes = DAG.getAllOnesConstant(DL, EltVT);