[X86] combineCastedMaskArithmetic - convert to SDPatternMatch matching. NFC. (llvm#144472)

Author: RKSimon

llvm/lib/Target/X86/X86ISelLowering.cpp

@@ -45513,6 +45513,7 @@ static SDValue combinevXi1ConstantToInteger(SDValue Op, SelectionDAG &DAG) {
 static SDValue combineCastedMaskArithmetic(SDNode *N, SelectionDAG &DAG,
                                            TargetLowering::DAGCombinerInfo &DCI,
                                            const X86Subtarget &Subtarget) {
+  using namespace SDPatternMatch;
   assert(N->getOpcode() == ISD::BITCAST && "Expected a bitcast");
 
   if (!DCI.isBeforeLegalizeOps())
@@ -45526,34 +45527,25 @@ static SDValue combineCastedMaskArithmetic(SDNode *N, SelectionDAG &DAG,
   SDValue Op = N->getOperand(0);
   EVT SrcVT = Op.getValueType();
 
-  if (!Op.hasOneUse())
-    return SDValue();
-
-  // Look for logic ops.
-  if (Op.getOpcode() != ISD::AND &&
-      Op.getOpcode() != ISD::OR &&
-      Op.getOpcode() != ISD::XOR)
-    return SDValue();
-
   // Make sure we have a bitcast between mask registers and a scalar type.
   if (!(SrcVT.isVector() && SrcVT.getVectorElementType() == MVT::i1 &&
         DstVT.isScalarInteger()) &&
       !(DstVT.isVector() && DstVT.getVectorElementType() == MVT::i1 &&
         SrcVT.isScalarInteger()))
     return SDValue();
 
-  SDValue LHS = Op.getOperand(0);
-  SDValue RHS = Op.getOperand(1);
+  SDValue LHS, RHS;
 
-  if (LHS.hasOneUse() && LHS.getOpcode() == ISD::BITCAST &&
-      LHS.getOperand(0).getValueType() == DstVT)
-    return DAG.getNode(Op.getOpcode(), SDLoc(N), DstVT, LHS.getOperand(0),
-                       DAG.getBitcast(DstVT, RHS));
+  // Look for logic ops.
+  if (!sd_match(Op, m_OneUse(m_BitwiseLogic(m_Value(LHS), m_Value(RHS)))))
+    return SDValue();
 
-  if (RHS.hasOneUse() && RHS.getOpcode() == ISD::BITCAST &&
-      RHS.getOperand(0).getValueType() == DstVT)
+  // If either operand was bitcast from DstVT, then perform logic with DstVT (at
+  // least one of the getBitcast() will fold away).
+  if (sd_match(LHS, m_OneUse(m_BitCast(m_SpecificVT(DstVT)))) ||
+      sd_match(RHS, m_OneUse(m_BitCast(m_SpecificVT(DstVT)))))
     return DAG.getNode(Op.getOpcode(), SDLoc(N), DstVT,
-                       DAG.getBitcast(DstVT, LHS), RHS.getOperand(0));
+                       DAG.getBitcast(DstVT, LHS), DAG.getBitcast(DstVT, RHS));
 
   // If the RHS is a vXi1 build vector, this is a good reason to flip too.
   // Most of these have to move a constant from the scalar domain anyway.