//===-- CSKYISelLowering.cpp - CSKY DAG Lowering Implementation ----------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines the interfaces that CSKY uses to lower LLVM code into a
// selection DAG.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_CSKY_CSKYISELLOWERING_H
#define LLVM_LIB_TARGET_CSKY_CSKYISELLOWERING_H
#include "MCTargetDesc/CSKYBaseInfo.h"
#include "llvm/CodeGen/CallingConvLower.h"
#include "llvm/CodeGen/TargetLowering.h"
namespace llvm {
class CSKYSubtarget;
namespace CSKYISD {
enum NodeType : unsigned {
FIRST_NUMBER = ISD::BUILTIN_OP_END,
NIE,
NIR,
RET,
CALL,
CALLReg,
TAIL,
TAILReg,
LOAD_ADDR,
// i32, i32 <-- f64
BITCAST_TO_LOHI,
// f64 < -- i32, i32
BITCAST_FROM_LOHI,
};
}
class CSKYTargetLowering : public TargetLowering {
const CSKYSubtarget &Subtarget;
public:
explicit CSKYTargetLowering(const TargetMachine &TM,
const CSKYSubtarget &STI);
SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override;
EVT getSetCCResultType(const DataLayout &DL, LLVMContext &Context,
EVT VT) const override;
private:
SDValue LowerFormalArguments(SDValue Chain, CallingConv::ID CallConv,
bool IsVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins,
const SDLoc &DL, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) const override;
bool CanLowerReturn(CallingConv::ID CallConv, MachineFunction &MF,
bool IsVarArg,
const SmallVectorImpl<ISD::OutputArg> &Outs,
LLVMContext &Context) const override;
SDValue LowerReturn(SDValue Chain, CallingConv::ID CallConv, bool IsVarArg,
const SmallVectorImpl<ISD::OutputArg> &Outs,
const SmallVectorImpl<SDValue> &OutVals, const SDLoc &DL,
SelectionDAG &DAG) const override;
SDValue LowerCall(TargetLowering::CallLoweringInfo &CLI,
SmallVectorImpl<SDValue> &InVals) const override;
const char *getTargetNodeName(unsigned Opcode) const override;
/// If a physical register, this returns the register that receives the
/// exception address on entry to an EH pad.
Register
getExceptionPointerRegister(const Constant *PersonalityFn) const override;
/// If a physical register, this returns the register that receives the
/// exception typeid on entry to a landing pad.
Register
getExceptionSelectorRegister(const Constant *PersonalityFn) const override;
bool isSelectSupported(SelectSupportKind Kind) const override {
// CSKY does not support scalar condition selects on vectors.
return (Kind != ScalarCondVectorVal);
}
ConstraintType getConstraintType(StringRef Constraint) const override;
std::pair<unsigned, const TargetRegisterClass *>
getRegForInlineAsmConstraint(const TargetRegisterInfo *TRI,
StringRef Constraint, MVT VT) const override;
MachineBasicBlock *
EmitInstrWithCustomInserter(MachineInstr &MI,
MachineBasicBlock *BB) const override;
SDValue getTargetNode(GlobalAddressSDNode *N, SDLoc DL, EVT Ty,
SelectionDAG &DAG, unsigned Flags) const;
SDValue getTargetNode(ExternalSymbolSDNode *N, SDLoc DL, EVT Ty,
SelectionDAG &DAG, unsigned Flags) const;
SDValue getTargetNode(JumpTableSDNode *N, SDLoc DL, EVT Ty, SelectionDAG &DAG,
unsigned Flags) const;
SDValue getTargetNode(BlockAddressSDNode *N, SDLoc DL, EVT Ty,
SelectionDAG &DAG, unsigned Flags) const;
SDValue getTargetNode(ConstantPoolSDNode *N, SDLoc DL, EVT Ty,
SelectionDAG &DAG, unsigned Flags) const;
SDValue getTargetConstantPoolValue(GlobalAddressSDNode *N, EVT Ty,
SelectionDAG &DAG, unsigned Flags) const;
SDValue getTargetConstantPoolValue(ExternalSymbolSDNode *N, EVT Ty,
SelectionDAG &DAG, unsigned Flags) const;
SDValue getTargetConstantPoolValue(JumpTableSDNode *N, EVT Ty,
SelectionDAG &DAG, unsigned Flags) const;
SDValue getTargetConstantPoolValue(BlockAddressSDNode *N, EVT Ty,
SelectionDAG &DAG, unsigned Flags) const;
SDValue getTargetConstantPoolValue(ConstantPoolSDNode *N, EVT Ty,
SelectionDAG &DAG, unsigned Flags) const;
template <class NodeTy, bool IsCall = false>
SDValue getAddr(NodeTy *N, SelectionDAG &DAG, bool IsLocal = true) const {
SDLoc DL(N);
EVT Ty = getPointerTy(DAG.getDataLayout());
unsigned Flag = CSKYII::MO_None;
bool IsPIC = isPositionIndependent();
if (IsPIC)
Flag = IsLocal ? CSKYII::MO_GOTOFF
: IsCall ? CSKYII::MO_PLT32
: CSKYII::MO_GOT32;
SDValue TCPV = getTargetConstantPoolValue(N, Ty, DAG, Flag);
SDValue TV = getTargetNode(N, DL, Ty, DAG, Flag);
SDValue Addr = DAG.getNode(CSKYISD::LOAD_ADDR, DL, Ty, {TV, TCPV});
if (!IsPIC)
return Addr;
SDValue Result =
DAG.getNode(ISD::ADD, DL, Ty, {DAG.getGLOBAL_OFFSET_TABLE(Ty), Addr});
if (IsLocal)
return Result;
return DAG.getLoad(Ty, DL, DAG.getEntryNode(), Result,
MachinePointerInfo::getGOT(DAG.getMachineFunction()));
}
SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerExternalSymbol(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerBlockAddress(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerJumpTable(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const;
SDValue getStaticTLSAddr(GlobalAddressSDNode *N, SelectionDAG &DAG,
bool UseGOT) const;
SDValue getDynamicTLSAddr(GlobalAddressSDNode *N, SelectionDAG &DAG) const;
CCAssignFn *CCAssignFnForCall(CallingConv::ID CC, bool IsVarArg) const;
CCAssignFn *CCAssignFnForReturn(CallingConv::ID CC, bool IsVarArg) const;
bool decomposeMulByConstant(LLVMContext &Context, EVT VT,
SDValue C) const override;
bool isCheapToSpeculateCttz(Type *Ty) const override;
bool isCheapToSpeculateCtlz(Type *Ty) const override;
};
} // namespace llvm
#endif // LLVM_LIB_TARGET_CSKY_CSKYISELLOWERING_H
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