Switch special case handling.

Author: rj-jesus

llvm/lib/Target/AArch64/AArch64ISelLowering.cpp

@@ -22352,11 +22352,11 @@ static SDValue performSubWithBorrowCombine(SDNode *N, SelectionDAG &DAG) {
 
   SDLoc DL(N);
   SDValue N0 = N->getOperand(0);
-  if (N0->getOpcode() != ISD::SUB)
-    return DAG.getNode(AArch64ISD::SBC, DL, VT, N0, DAG.getConstant(0, DL, VT),
-                       Flags);
-  return DAG.getNode(AArch64ISD::SBC, DL, VT, N0.getOperand(0),
-                     N0.getOperand(1), Flags);
+  if (N0->getOpcode() == ISD::SUB)
+    return DAG.getNode(AArch64ISD::SBC, DL, VT, N0.getOperand(0),
+                       N0.getOperand(1), Flags);
+  return DAG.getNode(AArch64ISD::SBC, DL, VT, N0, DAG.getConstant(0, DL, VT),
+                     Flags);
 }
 
 static SDValue performAddSubCombine(SDNode *N,