[X86][SSE] combineBitcastvxi1 - add support for bitcasting to non-scalar integers

Truncate the movmsk scalar integer result to the equivalent scalar integer width as before but then bitcast to the requested type.

We still have the issue identified in PR41594 but D61114 should handle this.

llvm-svn: 359176

llvm/lib/Target/X86/X86ISelLowering.cpp

@@ -33735,8 +33735,7 @@ static SDValue combineBitcastvxi1(SelectionDAG &DAG, EVT VT, SDValue Src,
                                   const SDLoc &DL,
                                   const X86Subtarget &Subtarget) {
   EVT SrcVT = Src.getValueType();
-
-  if (!VT.isScalarInteger() || !SrcVT.isSimple())
+  if (!SrcVT.isSimple() || SrcVT.getScalarType() != MVT::i1)
     return SDValue();
 
   // If the input is a truncate from v16i8 or v32i8 go ahead and use a
@@ -33832,7 +33831,11 @@ static SDValue combineBitcastvxi1(SelectionDAG &DAG, EVT VT, SDValue Src,
                       DAG.getUNDEF(MVT::v8i16));
     V = DAG.getNode(X86ISD::MOVMSK, DL, MVT::i32, V);
   }
-  return DAG.getZExtOrTrunc(V, DL, VT);
+
+  EVT IntVT =
+      EVT::getIntegerVT(*DAG.getContext(), SrcVT.getVectorNumElements());
+  V = DAG.getZExtOrTrunc(V, DL, IntVT);
+  return DAG.getBitcast(VT, V);
 }
 
 // Convert a vXi1 constant build vector to the same width scalar integer.