SDOperand AlphaTargetLowering::CustomPromoteOperation(SDOperand Op, 
                                                      SelectionDAG &DAG) {
  assert(Op.getValueType() == MVT::i32 && 
         Op.getOpcode() == ISD::VAARG &&
         "Unknown node to custom promote!");
  
  // The code in LowerOperation already handles i32 vaarg
  return LowerOperation(Op, DAG);
}
/// LowerOperation - Provide custom lowering hooks for some operations.
///
SDOperand AlphaTargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) {
  switch (Op.getOpcode()) {
  default: assert(0 && "Wasn't expecting to be able to lower this!");
  case ISD::FORMAL_ARGUMENTS: return LowerFORMAL_ARGUMENTS(Op, DAG, 
                                                           VarArgsBase,
                                                           VarArgsOffset);

  case ISD::RET: return LowerRET(Op,DAG);
  case ISD::JumpTable: return LowerJumpTable(Op, DAG);

  case ISD::SINT_TO_FP: {
    assert(MVT::i64 == Op.getOperand(0).getValueType() && 
           "Unhandled SINT_TO_FP type in custom expander!");
    SDOperand LD;
    bool isDouble = MVT::f64 == Op.getValueType();
    LD = DAG.getNode(ISD::BIT_CONVERT, MVT::f64, Op.getOperand(0));
    SDOperand FP = DAG.getNode(isDouble?AlphaISD::CVTQT_:AlphaISD::CVTQS_,
                               isDouble?MVT::f64:MVT::f32, LD);
    return FP;
  }
  case ISD::FP_TO_SINT: {
    bool isDouble = MVT::f64 == Op.getOperand(0).getValueType();
    SDOperand src = Op.getOperand(0);

    if (!isDouble) //Promote
      src = DAG.getNode(ISD::FP_EXTEND, MVT::f64, src);
    
    src = DAG.getNode(AlphaISD::CVTTQ_, MVT::f64, src);

    return DAG.getNode(ISD::BIT_CONVERT, MVT::i64, src);
  }
  case ISD::ConstantPool: {
    ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
    Constant *C = CP->getConstVal();
    SDOperand CPI = DAG.getTargetConstantPool(C, MVT::i64, CP->getAlignment());
    
    SDOperand Hi = DAG.getNode(AlphaISD::GPRelHi,  MVT::i64, CPI,
                               DAG.getNode(ISD::GLOBAL_OFFSET_TABLE, MVT::i64));
    SDOperand Lo = DAG.getNode(AlphaISD::GPRelLo, MVT::i64, CPI, Hi);
    return Lo;
  }
  case ISD::GlobalAddress: {
    GlobalAddressSDNode *GSDN = cast<GlobalAddressSDNode>(Op);
    GlobalValue *GV = GSDN->getGlobal();
    SDOperand GA = DAG.getTargetGlobalAddress(GV, MVT::i64, GSDN->getOffset());

    //    if (!GV->hasWeakLinkage() && !GV->isDeclaration() && !GV->hasLinkOnceLinkage()) {
    if (GV->hasInternalLinkage()) {
      SDOperand Hi = DAG.getNode(AlphaISD::GPRelHi,  MVT::i64, GA,
                                DAG.getNode(ISD::GLOBAL_OFFSET_TABLE, MVT::i64));
      SDOperand Lo = DAG.getNode(AlphaISD::GPRelLo, MVT::i64, GA, Hi);
      return Lo;
    } else
      return DAG.getNode(AlphaISD::RelLit, MVT::i64, GA, 
                         DAG.getNode(ISD::GLOBAL_OFFSET_TABLE, MVT::i64));
  }
  case ISD::ExternalSymbol: {
    return DAG.getNode(AlphaISD::RelLit, MVT::i64, 
                       DAG.getTargetExternalSymbol(cast<ExternalSymbolSDNode>(Op)
                                                   ->getSymbol(), MVT::i64),
                       DAG.getNode(ISD::GLOBAL_OFFSET_TABLE, MVT::i64));
  }

  case ISD::UREM:
  case ISD::SREM:
    //Expand only on constant case
    if (Op.getOperand(1).getOpcode() == ISD::Constant) {
      MVT::ValueType VT = Op.Val->getValueType(0);
      SDOperand Tmp1 = Op.Val->getOpcode() == ISD::UREM ?
        BuildUDIV(Op.Val, DAG, NULL) :
        BuildSDIV(Op.Val, DAG, NULL);
      Tmp1 = DAG.getNode(ISD::MUL, VT, Tmp1, Op.getOperand(1));
      Tmp1 = DAG.getNode(ISD::SUB, VT, Op.getOperand(0), Tmp1);
      return Tmp1;
    }
    //fall through
  case ISD::SDIV:
  case ISD::UDIV:
    if (MVT::isInteger(Op.getValueType())) {
      if (Op.getOperand(1).getOpcode() == ISD::Constant)
        return Op.getOpcode() == ISD::SDIV ? BuildSDIV(Op.Val, DAG, NULL) 
          : BuildUDIV(Op.Val, DAG, NULL);
      const char* opstr = 0;
      switch (Op.getOpcode()) {
      case ISD::UREM: opstr = "__remqu"; break;
      case ISD::SREM: opstr = "__remq";  break;
      case ISD::UDIV: opstr = "__divqu"; break;
      case ISD::SDIV: opstr = "__divq";  break;
      }
      SDOperand Tmp1 = Op.getOperand(0),
        Tmp2 = Op.getOperand(1),
        Addr = DAG.getExternalSymbol(opstr, MVT::i64);
      return DAG.getNode(AlphaISD::DivCall, MVT::i64, Addr, Tmp1, Tmp2);
    }
    break;

  case ISD::VAARG: {
    SDOperand Chain = Op.getOperand(0);
    SDOperand VAListP = Op.getOperand(1);
    SrcValueSDNode *VAListS = cast<SrcValueSDNode>(Op.getOperand(2));
    
    SDOperand Base = DAG.getLoad(MVT::i64, Chain, VAListP, VAListS->getValue(),
                                 VAListS->getOffset());
    SDOperand Tmp = DAG.getNode(ISD::ADD, MVT::i64, VAListP,
                                DAG.getConstant(8, MVT::i64));
    SDOperand Offset = DAG.getExtLoad(ISD::SEXTLOAD, MVT::i64, Base.getValue(1),
                                      Tmp, NULL, 0, MVT::i32);
    SDOperand DataPtr = DAG.getNode(ISD::ADD, MVT::i64, Base, Offset);
    if (MVT::isFloatingPoint(Op.getValueType()))
    {
      //if fp && Offset < 6*8, then subtract 6*8 from DataPtr
      SDOperand FPDataPtr = DAG.getNode(ISD::SUB, MVT::i64, DataPtr,
                                        DAG.getConstant(8*6, MVT::i64));
      SDOperand CC = DAG.getSetCC(MVT::i64, Offset,
                                  DAG.getConstant(8*6, MVT::i64), ISD::SETLT);
      DataPtr = DAG.getNode(ISD::SELECT, MVT::i64, CC, FPDataPtr, DataPtr);
    }

    SDOperand NewOffset = DAG.getNode(ISD::ADD, MVT::i64, Offset,
                                      DAG.getConstant(8, MVT::i64));
    SDOperand Update = DAG.getTruncStore(Offset.getValue(1), NewOffset,
                                         Tmp, NULL, 0, MVT::i32);
    
    SDOperand Result;
    if (Op.getValueType() == MVT::i32)
      Result = DAG.getExtLoad(ISD::SEXTLOAD, MVT::i64, Update, DataPtr,
                              NULL, 0, MVT::i32);
    else
      Result = DAG.getLoad(Op.getValueType(), Update, DataPtr, NULL, 0);
    return Result;
  }
  case ISD::VACOPY: {
    SDOperand Chain = Op.getOperand(0);
    SDOperand DestP = Op.getOperand(1);
    SDOperand SrcP = Op.getOperand(2);
    SrcValueSDNode *DestS = cast<SrcValueSDNode>(Op.getOperand(3));
    SrcValueSDNode *SrcS = cast<SrcValueSDNode>(Op.getOperand(4));
    
    SDOperand Val = DAG.getLoad(getPointerTy(), Chain, SrcP,
                                SrcS->getValue(), SrcS->getOffset());
    SDOperand Result = DAG.getStore(Val.getValue(1), Val, DestP, DestS->getValue(),
                                    DestS->getOffset());
    SDOperand NP = DAG.getNode(ISD::ADD, MVT::i64, SrcP, 
                               DAG.getConstant(8, MVT::i64));
    Val = DAG.getExtLoad(ISD::SEXTLOAD, MVT::i64, Result, NP, NULL,0, MVT::i32);
    SDOperand NPD = DAG.getNode(ISD::ADD, MVT::i64, DestP,
                                DAG.getConstant(8, MVT::i64));
    return DAG.getTruncStore(Val.getValue(1), Val, NPD, NULL, 0, MVT::i32);
  }
  case ISD::VASTART: {
    SDOperand Chain = Op.getOperand(0);
    SDOperand VAListP = Op.getOperand(1);
    SrcValueSDNode *VAListS = cast<SrcValueSDNode>(Op.getOperand(2));
    
    // vastart stores the address of the VarArgsBase and VarArgsOffset
    SDOperand FR  = DAG.getFrameIndex(VarArgsBase, MVT::i64);
    SDOperand S1  = DAG.getStore(Chain, FR, VAListP, VAListS->getValue(),
                                 VAListS->getOffset());
    SDOperand SA2 = DAG.getNode(ISD::ADD, MVT::i64, VAListP,
                                DAG.getConstant(8, MVT::i64));
    return DAG.getTruncStore(S1, DAG.getConstant(VarArgsOffset, MVT::i64),
                             SA2, NULL, 0, MVT::i32);
  }
  case ISD::RETURNADDR:        
    return DAG.getNode(AlphaISD::GlobalRetAddr, MVT::i64);
      //FIXME: implement
  case ISD::FRAMEADDR:          break;
  }
  
  return SDOperand();
}
Exemplo n.º 3
0
SDOperand IA64TargetLowering::
LowerOperation(SDOperand Op, SelectionDAG &DAG) {
  switch (Op.getOpcode()) {
  default: assert(0 && "Should not custom lower this!");
  case ISD::GlobalTLSAddress:
    assert(0 && "TLS not implemented for IA64.");
  case ISD::RET: {
    SDOperand AR_PFSVal, Copy;
    
    switch(Op.getNumOperands()) {
     default:
      assert(0 && "Do not know how to return this many arguments!");
      abort();
    case 1: 
      AR_PFSVal = DAG.getCopyFromReg(Op.getOperand(0), VirtGPR, MVT::i64);
      AR_PFSVal = DAG.getCopyToReg(AR_PFSVal.getValue(1), IA64::AR_PFS, 
                                   AR_PFSVal);
      return DAG.getNode(IA64ISD::RET_FLAG, MVT::Other, AR_PFSVal);
    case 3: {
      // Copy the result into the output register & restore ar.pfs
      MVT::ValueType ArgVT = Op.getOperand(1).getValueType();
      unsigned ArgReg = MVT::isInteger(ArgVT) ? IA64::r8 : IA64::F8;

      AR_PFSVal = DAG.getCopyFromReg(Op.getOperand(0), VirtGPR, MVT::i64);
      Copy = DAG.getCopyToReg(AR_PFSVal.getValue(1), ArgReg, Op.getOperand(1),
                              SDOperand());
      AR_PFSVal = DAG.getCopyToReg(Copy.getValue(0), IA64::AR_PFS, AR_PFSVal,
                                   Copy.getValue(1));
      return DAG.getNode(IA64ISD::RET_FLAG, MVT::Other,
                         AR_PFSVal, AR_PFSVal.getValue(1));
    }
    }
    return SDOperand();
  }
  case ISD::VAARG: {
    MVT::ValueType VT = getPointerTy();
    const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
    SDOperand VAList = DAG.getLoad(VT, Op.getOperand(0), Op.getOperand(1), 
                                   SV, 0);
    // Increment the pointer, VAList, to the next vaarg
    SDOperand VAIncr = DAG.getNode(ISD::ADD, VT, VAList, 
                                   DAG.getConstant(MVT::getSizeInBits(VT)/8, 
                                                   VT));
    // Store the incremented VAList to the legalized pointer
    VAIncr = DAG.getStore(VAList.getValue(1), VAIncr,
                          Op.getOperand(1), SV, 0);
    // Load the actual argument out of the pointer VAList
    return DAG.getLoad(Op.getValueType(), VAIncr, VAList, NULL, 0);
  }
  case ISD::VASTART: {
    // vastart just stores the address of the VarArgsFrameIndex slot into the
    // memory location argument.
    SDOperand FR = DAG.getFrameIndex(VarArgsFrameIndex, MVT::i64);
    const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
    return DAG.getStore(Op.getOperand(0), FR, Op.getOperand(1), SV, 0);
  }
  // Frame & Return address.  Currently unimplemented
  case ISD::RETURNADDR:         break;
  case ISD::FRAMEADDR:          break;
  }
  return SDOperand();
}