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// SPDX-License-Identifier: GPL-3.0-or-later
#ifndef RCC_CODEGEN_GLOBALISEL_LEGALIZERHELPER_H
#define RCC_CODEGEN_GLOBALISEL_LEGALIZERHELPER_H
#include "rcc/CodeGen/GenericOpcodes.h"
#include "rcc/CodeGen/GlobalISel/LegalizerInfo.h"
#include "rcc/CodeGen/MachineIRBuilder.h"
#include "rcc/Support/Error.h"
#include <vector>
namespace rcc {
class MachineFunction;
class MachineInstr;
class GISelChangeObserver;
struct LibcallLoweringInfo;
class LegalizerHelper final {
public:
MachineIRBuilder &MIRBuilder;
GISelChangeObserver &Observer;
LegalizerHelper(MachineFunction &Function, const LegalizerInfo &Info,
GISelChangeObserver &Observer, MachineIRBuilder &MIRBuilder,
const LibcallLoweringInfo *Libcalls = nullptr);
[[nodiscard]] Expected<void> legalize(MachineInstr &Instruction,
const LegalizationDecision &Decision);
[[nodiscard]] Expected<void> lower(MachineInstr &Instruction,
const LegalizationDecision &Decision);
[[nodiscard]] Expected<void> lowerAbsToAddXor(MachineInstr &Instruction);
[[nodiscard]] Expected<void> lowerAbsDiffToSelect(MachineInstr &Instruction);
[[nodiscard]] Expected<void> lowerAbsDiffToMinMax(MachineInstr &Instruction);
[[nodiscard]] Expected<void> lowerMinMax(MachineInstr &Instruction);
[[nodiscard]] Expected<void> lowerThreewayCompare(MachineInstr &Instruction);
[[nodiscard]] Expected<void> lowerRotate(MachineInstr &Instruction);
[[nodiscard]] Expected<void> lowerVAArg(MachineInstr &Instruction);
[[nodiscard]] Expected<void> libcall(MachineInstr &Instruction);
[[nodiscard]] Expected<void> widenScalar(MachineInstr &Instruction, std::size_t TypeIndex,
LowLevelType WideType);
[[nodiscard]] Expected<void> widenScalarSrc(MachineInstr &Instruction, LowLevelType WideType,
std::size_t OperandIndex,
GenericOpcode ExtensionOpcode);
[[nodiscard]] Expected<void> narrowScalarSrc(MachineInstr &Instruction, LowLevelType NarrowType,
std::size_t OperandIndex);
[[nodiscard]] Expected<void> narrowScalarDst(MachineInstr &Instruction, LowLevelType NarrowType,
std::size_t OperandIndex,
GenericOpcode ExtensionOpcode);
[[nodiscard]] Expected<void> widenScalarDst(MachineInstr &Instruction, LowLevelType WideType,
std::size_t OperandIndex = 0,
GenericOpcode TruncOpcode = GenericOpcode::G_TRUNC);
[[nodiscard]] Expected<void> narrowScalar(MachineInstr &Instruction, std::size_t TypeIndex,
LowLevelType NarrowType);
private:
[[nodiscard]] Expected<void> widenScalarMergeValues(MachineInstr &Instruction,
std::size_t TypeIndex, LowLevelType WideType);
[[nodiscard]] Expected<void>
widenScalarUnmergeValues(MachineInstr &Instruction, std::size_t TypeIndex, LowLevelType WideType);
[[nodiscard]] Expected<void> insertParts(Register Destination, LowLevelType ResultType,
LowLevelType PartType,
const std::vector<Register> &PartRegisters,
LowLevelType LeftoverType = {},
const std::vector<Register> &LeftoverRegisters = {});
[[nodiscard]] Expected<void> extractGCDType(std::vector<Register> &Parts, LowLevelType GCDType,
Register Source);
[[nodiscard]] Expected<LowLevelType> extractGCDType(std::vector<Register> &Parts,
LowLevelType DestinationType,
LowLevelType NarrowType, Register Source);
[[nodiscard]] Expected<LowLevelType>
buildLCMMergePieces(LowLevelType DestinationType, LowLevelType NarrowType, LowLevelType GCDType,
std::vector<Register> &Registers,
GenericOpcode PadStrategy = GenericOpcode::G_ANYEXT);
[[nodiscard]] Expected<void>
buildWidenedRemergeToDst(Register Destination, LowLevelType LCMType,
const std::vector<Register> &RemergeRegisters);
[[nodiscard]] Expected<void> narrowScalarAddSub(MachineInstr &Instruction, std::size_t TypeIndex,
LowLevelType NarrowType);
[[nodiscard]] Expected<void> narrowScalarBasic(MachineInstr &Instruction, std::size_t TypeIndex,
LowLevelType NarrowType);
[[nodiscard]] Expected<void> narrowScalarExt(MachineInstr &Instruction, std::size_t TypeIndex,
LowLevelType NarrowType);
[[nodiscard]] Expected<void> narrowScalarSelect(MachineInstr &Instruction, std::size_t TypeIndex,
LowLevelType NarrowType);
[[nodiscard]] Expected<void> narrowScalarShift(MachineInstr &Instruction, std::size_t TypeIndex,
LowLevelType NarrowType);
[[nodiscard]] Expected<void> narrowScalarShiftByConstant(MachineInstr &Instruction,
const APInt &Amount,
LowLevelType HalfType,
LowLevelType AmountType);
[[nodiscard]] Expected<void> narrowScalarShiftMultiway(MachineInstr &Instruction,
LowLevelType TargetType);
[[nodiscard]] Expected<void> narrowScalarShiftByConstantMultiway(MachineInstr &Instruction,
const APInt &Amount,
LowLevelType TargetType,
LowLevelType AmountType);
struct ShiftParameters final {
Register WordShift;
Register BitShift;
Register InverseBitShift;
Register Zero;
Register SignBit;
};
[[nodiscard]] Expected<Register>
buildConstantShiftPart(GenericOpcode Generic, std::size_t PartIndex, std::size_t PartCount,
const std::vector<Register> &SourceParts,
const ShiftParameters &Parameters, LowLevelType TargetType);
[[nodiscard]] Expected<Register>
buildVariableShiftPart(GenericOpcode Generic, Register MainOperand, Register ShiftAmount,
LowLevelType TargetType, Register CarryOperand = {});
[[nodiscard]] Expected<void> widenScalarAddSubOverflow(MachineInstr &Instruction,
std::size_t TypeIndex,
LowLevelType WideType);
[[nodiscard]] Expected<void> lowerSignedAddSubOverflow(MachineInstr &Instruction);
MachineFunction &Function;
MachineRegisterInfo &MRI;
const LegalizerInfo &Info;
const LibcallLoweringInfo *Libcalls = nullptr;
};
} // namespace rcc
#endif // RCC_CODEGEN_GLOBALISEL_LEGALIZERHELPER_H
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