C++ LoadSDNode::getMemoryVT方法代码示例

/// getPostIndexedAddressParts - returns true by value, base pointer and
/// offset pointer and addressing mode by reference if this node can be
/// combined with a load / store to form a post-indexed load / store.
bool MSP430TargetLowering::getPostIndexedAddressParts(SDNode *N, SDNode *Op,
                                                      SDValue &Base,
                                                      SDValue &Offset,
                                                      ISD::MemIndexedMode &AM,
                                                      SelectionDAG &DAG) const {

  LoadSDNode *LD = cast<LoadSDNode>(N);
  if (LD->getExtensionType() != ISD::NON_EXTLOAD)
    return false;

  EVT VT = LD->getMemoryVT();
  if (VT != MVT::i8 && VT != MVT::i16)
    return false;

  if (Op->getOpcode() != ISD::ADD)
    return false;

  if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(Op->getOperand(1))) {
    uint64_t RHSC = RHS->getZExtValue();
    if ((VT == MVT::i16 && RHSC != 2) ||
        (VT == MVT::i8 && RHSC != 1))
      return false;

    Base = Op->getOperand(0);
    Offset = DAG.getConstant(RHSC, VT);
    AM = ISD::POST_INC;
    return true;
  }

  return false;
}

void Mips16DAGToDAGISel::getMips16SPRefReg(SDNode *Parent, SDValue &AliasReg) {
  SDValue AliasFPReg = CurDAG->getRegister(Mips::S0,
                                           getTargetLowering()->getPointerTy());
  if (Parent) {
    switch (Parent->getOpcode()) {
      case ISD::LOAD: {
        LoadSDNode *SD = dyn_cast<LoadSDNode>(Parent);
        switch (SD->getMemoryVT().getSizeInBits()) {
        case 8:
        case 16:
          AliasReg = TM.getFrameLowering()->hasFP(*MF)?
            AliasFPReg: getMips16SPAliasReg();
          return;
        }
        break;
      }
      case ISD::STORE: {
        StoreSDNode *SD = dyn_cast<StoreSDNode>(Parent);
        switch (SD->getMemoryVT().getSizeInBits()) {
        case 8:
        case 16:
          AliasReg = TM.getFrameLowering()->hasFP(*MF)?
            AliasFPReg: getMips16SPAliasReg();
          return;
        }
        break;
      }
    }
  }
  AliasReg = CurDAG->getRegister(Mips::SP, getTargetLowering()->getPointerTy());
  return;

}

//.........这里部分代码省略.........
        return CurDAG->getTargetNode(IA64::ADDL_GA, dl, MVT::i64, // ?
                                     CurDAG->getRegister(IA64::r1, MVT::i64), CPI);
    }

    case ISD::GlobalAddress: {
        GlobalValue *GV = cast<GlobalAddressSDNode>(N)->getGlobal();
        SDValue GA = CurDAG->getTargetGlobalAddress(GV, MVT::i64);
        SDValue Tmp =
            SDValue(CurDAG->getTargetNode(IA64::ADDL_GA, dl, MVT::i64,
                                          CurDAG->getRegister(IA64::r1,
                                                  MVT::i64), GA), 0);
        return CurDAG->getTargetNode(IA64::LD8, dl, MVT::i64, MVT::Other, Tmp,
                                     CurDAG->getEntryNode());
    }

    /* XXX
       case ISD::ExternalSymbol: {
         SDValue EA = CurDAG->getTargetExternalSymbol(
           cast<ExternalSymbolSDNode>(N)->getSymbol(),
           MVT::i64);
         SDValue Tmp = CurDAG->getTargetNode(IA64::ADDL_EA, dl, MVT::i64,
                                               CurDAG->getRegister(IA64::r1,
                                                                   MVT::i64),
                                               EA);
         return CurDAG->getTargetNode(IA64::LD8, dl, MVT::i64, Tmp);
       }
    */

    case ISD::LOAD: { // FIXME: load -1, not 1, for bools?
        LoadSDNode *LD = cast<LoadSDNode>(N);
        SDValue Chain = LD->getChain();
        SDValue Address = LD->getBasePtr();

        MVT TypeBeingLoaded = LD->getMemoryVT();
        unsigned Opc;
        switch (TypeBeingLoaded.getSimpleVT()) {
        default:
#ifndef NDEBUG
            N->dump(CurDAG);
#endif
            assert(0 && "Cannot load this type!");
        case MVT::i1: { // this is a bool
            Opc = IA64::LD1; // first we load a byte, then compare for != 0
            if(N->getValueType(0) == MVT::i1) { // XXX: early exit!
                return CurDAG->SelectNodeTo(N, IA64::CMPNE, MVT::i1, MVT::Other,
                                            SDValue(CurDAG->getTargetNode(Opc, dl,
                                                    MVT::i64,
                                                    Address), 0),
                                            CurDAG->getRegister(IA64::r0, MVT::i64),
                                            Chain);
            }
            /* otherwise, we want to load a bool into something bigger: LD1
               will do that for us, so we just fall through */
        }
        case MVT::i8:
            Opc = IA64::LD1;
            break;
        case MVT::i16:
            Opc = IA64::LD2;
            break;
        case MVT::i32:
            Opc = IA64::LD4;
            break;
        case MVT::i64:
            Opc = IA64::LD8;
            break;

SDNode *NVPTXDAGToDAGISel::SelectLoad(SDNode *N) {
  DebugLoc dl = N->getDebugLoc();
  LoadSDNode *LD = cast<LoadSDNode>(N);
  EVT LoadedVT = LD->getMemoryVT();
  SDNode *NVPTXLD = NULL;

  // do not support pre/post inc/dec
  if (LD->isIndexed())
    return NULL;

  if (!LoadedVT.isSimple())
    return NULL;

  // Address Space Setting
  unsigned int codeAddrSpace = getCodeAddrSpace(LD, Subtarget);

  // Volatile Setting
  // - .volatile is only availalble for .global and .shared
  bool isVolatile = LD->isVolatile();
  if (codeAddrSpace != NVPTX::PTXLdStInstCode::GLOBAL &&
      codeAddrSpace != NVPTX::PTXLdStInstCode::SHARED &&
      codeAddrSpace != NVPTX::PTXLdStInstCode::GENERIC)
    isVolatile = false;

  // Vector Setting
  MVT SimpleVT = LoadedVT.getSimpleVT();
  unsigned vecType = NVPTX::PTXLdStInstCode::Scalar;
  if (SimpleVT.isVector()) {
    unsigned num = SimpleVT.getVectorNumElements();
    if (num == 2)
      vecType = NVPTX::PTXLdStInstCode::V2;
    else if (num == 4)
      vecType = NVPTX::PTXLdStInstCode::V4;
    else
      return NULL;
  }

  // Type Setting: fromType + fromTypeWidth
  //
  // Sign   : ISD::SEXTLOAD
  // Unsign : ISD::ZEXTLOAD, ISD::NON_EXTLOAD or ISD::EXTLOAD and the
  //          type is integer
  // Float  : ISD::NON_EXTLOAD or ISD::EXTLOAD and the type is float
  MVT ScalarVT = SimpleVT.getScalarType();
  unsigned fromTypeWidth = ScalarVT.getSizeInBits();
  unsigned int fromType;
  if ((LD->getExtensionType() == ISD::SEXTLOAD))
    fromType = NVPTX::PTXLdStInstCode::Signed;
  else if (ScalarVT.isFloatingPoint())
    fromType = NVPTX::PTXLdStInstCode::Float;
  else
    fromType = NVPTX::PTXLdStInstCode::Unsigned;

  // Create the machine instruction DAG
  SDValue Chain = N->getOperand(0);
  SDValue N1 = N->getOperand(1);
  SDValue Addr;
  SDValue Offset, Base;
  unsigned Opcode;
  MVT::SimpleValueType TargetVT = LD->getValueType(0).getSimpleVT().SimpleTy;

  if (SelectDirectAddr(N1, Addr)) {
    switch (TargetVT) {
    case MVT::i8:
      Opcode = NVPTX::LD_i8_avar;
      break;
    case MVT::i16:
      Opcode = NVPTX::LD_i16_avar;
      break;
    case MVT::i32:
      Opcode = NVPTX::LD_i32_avar;
      break;
    case MVT::i64:
      Opcode = NVPTX::LD_i64_avar;
      break;
    case MVT::f32:
      Opcode = NVPTX::LD_f32_avar;
      break;
    case MVT::f64:
      Opcode = NVPTX::LD_f64_avar;
      break;
    default:
      return NULL;
    }
    SDValue Ops[] = { getI32Imm(isVolatile), getI32Imm(codeAddrSpace),
                      getI32Imm(vecType), getI32Imm(fromType),
                      getI32Imm(fromTypeWidth), Addr, Chain };
    NVPTXLD = CurDAG->getMachineNode(Opcode, dl, TargetVT, MVT::Other, Ops, 7);
  } else if (Subtarget.is64Bit()
                 ? SelectADDRsi64(N1.getNode(), N1, Base, Offset)
                 : SelectADDRsi(N1.getNode(), N1, Base, Offset)) {
    switch (TargetVT) {
    case MVT::i8:
      Opcode = NVPTX::LD_i8_asi;
      break;
    case MVT::i16:
      Opcode = NVPTX::LD_i16_asi;
      break;
    case MVT::i32:
      Opcode = NVPTX::LD_i32_asi;
//.........这里部分代码省略.........