Fix comments.

Author: simonzgx

llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp

@@ -11619,17 +11619,17 @@ SDValue DAGCombiner::foldShiftToAvg(SDNode *N) {
 
 SDValue DAGCombiner::foldBitwiseOpWithNeg(SDNode *N, const SDLoc &DL, EVT VT) {
   unsigned Opc = N->getOpcode();
-  SDValue X, Y, Z, NotY;
-  if (sd_match(N, m_BitwiseLogic(m_Value(X), m_Add(m_AllOf(m_Value(NotY),
-                                                           m_Not(m_Value(Y))),
-                                                   m_Value(Z)))))
+  SDValue X, Y, Z;
+  if (sd_match(N, m_BitwiseLogic(m_Value(X),
+                                 m_Add(m_AllOf(m_Value(Y), m_Not(m_Value(Y))),
+                                       m_Value(Z)))))
     return DAG.getNode(Opc, DL, VT, X,
                        DAG.getNOT(DL, DAG.getNode(ISD::SUB, DL, VT, Y, Z), VT));
 
-  if (sd_match(N, m_BitwiseLogic(m_Value(X), m_Sub(m_AllOf(m_Value(NotY),
-                                                           m_Not(m_Value(Y))),
-                                                   m_Value(Z)))) &&
-      NotY->hasOneUse())
+  if (sd_match(N, m_BitwiseLogic(m_Value(X),
+                                 m_Sub(m_AllOf(m_Value(Y), m_Not(m_Value(Y)),
+                                               m_OneUse(m_Not(m_Value(Y)))),
+                                       m_Value(Z)))))
     return DAG.getNode(Opc, DL, VT, X,
                        DAG.getNOT(DL, DAG.getNode(ISD::ADD, DL, VT, Y, Z), VT));