[DAG] Replace m_SpecificInt(1) -> m_One()

For SDPatternMatch there's no difference in undef/poison vector element handling - in fact m_One() just wraps m_SpecificInt(1)

Author: RKSimon

llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp

@@ -2563,14 +2563,12 @@ SDValue DAGCombiner::foldSubToAvg(SDNode *N, const SDLoc &DL) {
 
   if ((!LegalOperations || hasOperation(ISD::AVGCEILU, VT)) &&
       sd_match(N, m_Sub(m_Or(m_Value(A), m_Value(B)),
-                        m_Srl(m_Xor(m_Deferred(A), m_Deferred(B)),
-                              m_SpecificInt(1))))) {
+                        m_Srl(m_Xor(m_Deferred(A), m_Deferred(B)), m_One())))) {
     return DAG.getNode(ISD::AVGCEILU, DL, VT, A, B);
   }
   if ((!LegalOperations || hasOperation(ISD::AVGCEILS, VT)) &&
       sd_match(N, m_Sub(m_Or(m_Value(A), m_Value(B)),
-                        m_Sra(m_Xor(m_Deferred(A), m_Deferred(B)),
-                              m_SpecificInt(1))))) {
+                        m_Sra(m_Xor(m_Deferred(A), m_Deferred(B)), m_One())))) {
     return DAG.getNode(ISD::AVGCEILS, DL, VT, A, B);
   }
   return SDValue();
@@ -2928,14 +2926,12 @@ SDValue DAGCombiner::foldAddToAvg(SDNode *N, const SDLoc &DL) {
 
   if ((!LegalOperations || hasOperation(ISD::AVGFLOORU, VT)) &&
       sd_match(N, m_Add(m_And(m_Value(A), m_Value(B)),
-                        m_Srl(m_Xor(m_Deferred(A), m_Deferred(B)),
-                              m_SpecificInt(1))))) {
+                        m_Srl(m_Xor(m_Deferred(A), m_Deferred(B)), m_One())))) {
     return DAG.getNode(ISD::AVGFLOORU, DL, VT, A, B);
   }
   if ((!LegalOperations || hasOperation(ISD::AVGFLOORS, VT)) &&
       sd_match(N, m_Add(m_And(m_Value(A), m_Value(B)),
-                        m_Sra(m_Xor(m_Deferred(A), m_Deferred(B)),
-                              m_SpecificInt(1))))) {
+                        m_Sra(m_Xor(m_Deferred(A), m_Deferred(B)), m_One())))) {
     return DAG.getNode(ISD::AVGFLOORS, DL, VT, A, B);
   }