Remove DAGCombiner copy

Author: arsenm

Diff for: llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp

@@ -385,17 +385,6 @@ namespace {
     bool getTruncatedStoreValue(StoreSDNode *ST, SDValue &Val);
     bool extendLoadedValueToExtension(LoadSDNode *LD, SDValue &Val);
 
-    /// Replace an ISD::EXTRACT_VECTOR_ELT of a load with a narrowed
-    ///   load.
-    ///
-    /// \param EVE ISD::EXTRACT_VECTOR_ELT to be replaced.
-    /// \param InVecVT type of the input vector to EVE with bitcasts resolved.
-    /// \param EltNo index of the vector element to load.
-    /// \param OriginalLoad load that EVE came from to be replaced.
-    /// \returns EVE on success SDValue() on failure.
-    SDValue scalarizeExtractedVectorLoad(SDNode *EVE, EVT InVecVT,
-                                         SDValue EltNo,
-                                         LoadSDNode *OriginalLoad);
     void ReplaceLoadWithPromotedLoad(SDNode *Load, SDNode *ExtLoad);
     SDValue PromoteOperand(SDValue Op, EVT PVT, bool &Replace);
     SDValue SExtPromoteOperand(SDValue Op, EVT PVT);
@@ -22720,81 +22709,6 @@ SDValue DAGCombiner::visitINSERT_VECTOR_ELT(SDNode *N) {
   return SDValue();
 }
 
-SDValue DAGCombiner::scalarizeExtractedVectorLoad(SDNode *EVE, EVT InVecVT,
-                                                  SDValue EltNo,
-                                                  LoadSDNode *OriginalLoad) {
-  assert(OriginalLoad->isSimple());
-
-  EVT ResultVT = EVE->getValueType(0);
-  EVT VecEltVT = InVecVT.getVectorElementType();
-
-  // If the vector element type is not a multiple of a byte then we are unable
-  // to correctly compute an address to load only the extracted element as a
-  // scalar.
-  if (!VecEltVT.isByteSized())
-    return SDValue();
-
-  ISD::LoadExtType ExtTy =
-      ResultVT.bitsGT(VecEltVT) ? ISD::EXTLOAD : ISD::NON_EXTLOAD;
-  if (!TLI.isOperationLegalOrCustom(ISD::LOAD, VecEltVT) ||
-      !TLI.shouldReduceLoadWidth(OriginalLoad, ExtTy, VecEltVT))
-    return SDValue();
-
-  Align Alignment = OriginalLoad->getAlign();
-  MachinePointerInfo MPI;
-  SDLoc DL(EVE);
-  if (auto *ConstEltNo = dyn_cast<ConstantSDNode>(EltNo)) {
-    int Elt = ConstEltNo->getZExtValue();
-    unsigned PtrOff = VecEltVT.getSizeInBits() * Elt / 8;
-    MPI = OriginalLoad->getPointerInfo().getWithOffset(PtrOff);
-    Alignment = commonAlignment(Alignment, PtrOff);
-  } else {
-    // Discard the pointer info except the address space because the memory
-    // operand can't represent this new access since the offset is variable.
-    MPI = MachinePointerInfo(OriginalLoad->getPointerInfo().getAddrSpace());
-    Alignment = commonAlignment(Alignment, VecEltVT.getSizeInBits() / 8);
-  }
-
-  unsigned IsFast = 0;
-  if (!TLI.allowsMemoryAccess(*DAG.getContext(), DAG.getDataLayout(), VecEltVT,
-                              OriginalLoad->getAddressSpace(), Alignment,
-                              OriginalLoad->getMemOperand()->getFlags(),
-                              &IsFast) ||
-      !IsFast)
-    return SDValue();
-
-  SDValue NewPtr = TLI.getVectorElementPointer(DAG, OriginalLoad->getBasePtr(),
-                                               InVecVT, EltNo);
-
-  // We are replacing a vector load with a scalar load. The new load must have
-  // identical memory op ordering to the original.
-  SDValue Load;
-  if (ResultVT.bitsGT(VecEltVT)) {
-    // If the result type of vextract is wider than the load, then issue an
-    // extending load instead.
-    ISD::LoadExtType ExtType =
-        TLI.isLoadExtLegal(ISD::ZEXTLOAD, ResultVT, VecEltVT) ? ISD::ZEXTLOAD
-                                                              : ISD::EXTLOAD;
-    Load = DAG.getExtLoad(ExtType, DL, ResultVT, OriginalLoad->getChain(),
-                          NewPtr, MPI, VecEltVT, Alignment,
-                          OriginalLoad->getMemOperand()->getFlags(),
-                          OriginalLoad->getAAInfo());
-    DAG.makeEquivalentMemoryOrdering(OriginalLoad, Load);
-  } else {
-    // The result type is narrower or the same width as the vector element
-    Load = DAG.getLoad(VecEltVT, DL, OriginalLoad->getChain(), NewPtr, MPI,
-                       Alignment, OriginalLoad->getMemOperand()->getFlags(),
-                       OriginalLoad->getAAInfo());
-    DAG.makeEquivalentMemoryOrdering(OriginalLoad, Load);
-    if (ResultVT.bitsLT(VecEltVT))
-      Load = DAG.getNode(ISD::TRUNCATE, DL, ResultVT, Load);
-    else
-      Load = DAG.getBitcast(ResultVT, Load);
-  }
-  ++OpsNarrowed;
-  return Load;
-}
-
 /// Transform a vector binary operation into a scalar binary operation by moving
 /// the math/logic after an extract element of a vector.
 static SDValue scalarizeExtractedBinOp(SDNode *ExtElt, SelectionDAG &DAG,
@@ -23362,7 +23276,7 @@ SDValue DAGCombiner::visitEXTRACT_VECTOR_ELT(SDNode *N) {
   if (Elt == -1)
     return DAG.getUNDEF(LVT);
 
-  return scalarizeExtractedVectorLoad(N, VecVT, Index, LN0);
+  return TLI.scalarizeExtractedVectorLoad(LVT, DL, VecVT, Index, LN0, DAG);
 }
 
 // Simplify (build_vec (ext )) to (bitcast (build_vec ))