//===-- SparcISelLowering.h - Sparc DAG Lowering Interface ------*- C++ -*-===//
//
// 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 Sparc uses to lower LLVM code into a
// selection DAG.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_SPARC_SPARCISELLOWERING_H
#define LLVM_LIB_TARGET_SPARC_SPARCISELLOWERING_H
#include "Sparc.h"
#include "llvm/CodeGen/TargetLowering.h"
namespace llvm {
class SparcSubtarget;
namespace SPISD {
enum NodeType : unsigned {
FIRST_NUMBER = ISD::BUILTIN_OP_END,
CMPICC, // Compare two GPR operands, set icc+xcc.
CMPFCC, // Compare two FP operands, set fcc.
BRICC, // Branch to dest on icc condition
BRXCC, // Branch to dest on xcc condition (64-bit only).
BRFCC, // Branch to dest on fcc condition
SELECT_ICC, // Select between two values using the current ICC flags.
SELECT_XCC, // Select between two values using the current XCC flags.
SELECT_FCC, // Select between two values using the current FCC flags.
Hi, Lo, // Hi/Lo operations, typically on a global address.
FTOI, // FP to Int within a FP register.
ITOF, // Int to FP within a FP register.
FTOX, // FP to Int64 within a FP register.
XTOF, // Int64 to FP within a FP register.
CALL, // A call instruction.
RET_FLAG, // Return with a flag operand.
GLOBAL_BASE_REG, // Global base reg for PIC.
FLUSHW, // FLUSH register windows to stack.
TLS_ADD, // For Thread Local Storage (TLS).
TLS_LD,
TLS_CALL
};
}
class SparcTargetLowering : public TargetLowering {
const SparcSubtarget *Subtarget;
public:
SparcTargetLowering(const TargetMachine &TM, const SparcSubtarget &STI);
SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override;
bool useSoftFloat() const override;
/// computeKnownBitsForTargetNode - Determine which of the bits specified
/// in Mask are known to be either zero or one and return them in the
/// KnownZero/KnownOne bitsets.
void computeKnownBitsForTargetNode(const SDValue Op,
KnownBits &Known,
const APInt &DemandedElts,
const SelectionDAG &DAG,
unsigned Depth = 0) const override;
MachineBasicBlock *
EmitInstrWithCustomInserter(MachineInstr &MI,
MachineBasicBlock *MBB) const override;
const char *getTargetNodeName(unsigned Opcode) const override;
ConstraintType getConstraintType(StringRef Constraint) const override;
ConstraintWeight
getSingleConstraintMatchWeight(AsmOperandInfo &info,
const char *constraint) const override;
void LowerAsmOperandForConstraint(SDValue Op,
std::string &Constraint,
std::vector<SDValue> &Ops,
SelectionDAG &DAG) const override;
unsigned
getInlineAsmMemConstraint(StringRef ConstraintCode) const override {
if (ConstraintCode == "o")
return InlineAsm::Constraint_o;
return TargetLowering::getInlineAsmMemConstraint(ConstraintCode);
}
std::pair<unsigned, const TargetRegisterClass *>
getRegForInlineAsmConstraint(const TargetRegisterInfo *TRI,
StringRef Constraint, MVT VT) const override;
bool isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const override;
MVT getScalarShiftAmountTy(const DataLayout &, EVT) const override {
return MVT::i32;
}
Register getRegisterByName(const char* RegName, LLT VT,
const MachineFunction &MF) 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 {
return SP::I0;
}
/// 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 {
return SP::I1;
}
/// Override to support customized stack guard loading.
bool useLoadStackGuardNode() const override;
void insertSSPDeclarations(Module &M) const override;
/// getSetCCResultType - Return the ISD::SETCC ValueType
EVT getSetCCResultType(const DataLayout &DL, LLVMContext &Context,
EVT VT) const override;
SDValue
LowerFormalArguments(SDValue Chain, CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins,
const SDLoc &dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) const override;
SDValue LowerFormalArguments_32(SDValue Chain, CallingConv::ID CallConv,
bool isVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins,
const SDLoc &dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) const;
SDValue LowerFormalArguments_64(SDValue Chain, CallingConv::ID CallConv,
bool isVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins,
const SDLoc &dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) const;
SDValue
LowerCall(TargetLowering::CallLoweringInfo &CLI,
SmallVectorImpl<SDValue> &InVals) const override;
SDValue LowerCall_32(TargetLowering::CallLoweringInfo &CLI,
SmallVectorImpl<SDValue> &InVals) const;
SDValue LowerCall_64(TargetLowering::CallLoweringInfo &CLI,
SmallVectorImpl<SDValue> &InVals) const;
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 LowerReturn_32(SDValue Chain, CallingConv::ID CallConv,
bool IsVarArg,
const SmallVectorImpl<ISD::OutputArg> &Outs,
const SmallVectorImpl<SDValue> &OutVals,
const SDLoc &DL, SelectionDAG &DAG) const;
SDValue LowerReturn_64(SDValue Chain, CallingConv::ID CallConv,
bool IsVarArg,
const SmallVectorImpl<ISD::OutputArg> &Outs,
const SmallVectorImpl<SDValue> &OutVals,
const SDLoc &DL, SelectionDAG &DAG) const;
SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerBlockAddress(SDValue Op, SelectionDAG &DAG) const;
SDValue withTargetFlags(SDValue Op, unsigned TF, SelectionDAG &DAG) const;
SDValue makeHiLoPair(SDValue Op, unsigned HiTF, unsigned LoTF,
SelectionDAG &DAG) const;
SDValue makeAddress(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerF128_LibCallArg(SDValue Chain, ArgListTy &Args, SDValue Arg,
const SDLoc &DL, SelectionDAG &DAG) const;
SDValue LowerF128Op(SDValue Op, SelectionDAG &DAG,
const char *LibFuncName,
unsigned numArgs) const;
SDValue LowerF128Compare(SDValue LHS, SDValue RHS, unsigned &SPCC,
const SDLoc &DL, SelectionDAG &DAG) const;
SDValue LowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG) const;
SDValue PerformBITCASTCombine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue bitcastConstantFPToInt(ConstantFPSDNode *C, const SDLoc &DL,
SelectionDAG &DAG) const;
SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const override;
bool ShouldShrinkFPConstant(EVT VT) const override {
// Do not shrink FP constpool if VT == MVT::f128.
// (ldd, call _Q_fdtoq) is more expensive than two ldds.
return VT != MVT::f128;
}
bool shouldInsertFencesForAtomic(const Instruction *I) const override {
// FIXME: We insert fences for each atomics and generate
// sub-optimal code for PSO/TSO. (Approximately nobody uses any
// mode but TSO, which makes this even more silly)
return true;
}
AtomicExpansionKind shouldExpandAtomicRMWInIR(AtomicRMWInst *AI) const override;
void ReplaceNodeResults(SDNode *N,
SmallVectorImpl<SDValue>& Results,
SelectionDAG &DAG) const override;
MachineBasicBlock *expandSelectCC(MachineInstr &MI, MachineBasicBlock *BB,
unsigned BROpcode) const;
};
} // end namespace llvm
#endif // SPARC_ISELLOWERING_H