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