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// SPDX-License-Identifier: GPL-3.0-or-later
#ifndef RCC_CODEGEN_GLOBALISEL_UTILS_H
#define RCC_CODEGEN_GLOBALISEL_UTILS_H
#include "rcc/CodeGen/LowLevelType.h"
#include "rcc/CodeGen/Register.h"
#include "rcc/Support/Error.h"
#include <cstddef>
#include <span>
#include <vector>
namespace rcc {
class MachineIRBuilder;
class MachineInstr;
class MachineRegisterInfo;
class TargetDescription;
/// Check whether an instruction only defines dead virtual registers and has no
/// observable side effects.
[[nodiscard]] bool isTriviallyDead(const MachineInstr &Instruction,
const MachineRegisterInfo &MRI,
const TargetDescription &Target) noexcept;
[[nodiscard]] Expected<void> eraseInstrs(std::span<MachineInstr *const> Instructions,
MachineRegisterInfo &MRI,
const TargetDescription &Target);
[[nodiscard]] Expected<void> eraseInstr(MachineInstr &Instruction,
MachineRegisterInfo &MRI,
const TargetDescription &Target);
[[nodiscard]] Expected<void> extractParts(Register Reg, LowLevelType Type,
int PartCount,
std::vector<Register> &Parts,
MachineIRBuilder &MIRBuilder,
MachineRegisterInfo &MRI);
[[nodiscard]] Expected<bool>
extractParts(Register Reg, LowLevelType RegisterType, LowLevelType MainType,
LowLevelType &LeftoverType, std::vector<Register> &Parts,
std::vector<Register> &LeftoverParts,
MachineIRBuilder &MIRBuilder, MachineRegisterInfo &MRI);
[[nodiscard]] Expected<LowLevelType> getLCMType(LowLevelType OriginalType,
LowLevelType TargetType);
[[nodiscard]] Expected<LowLevelType> getGCDType(LowLevelType OriginalType,
LowLevelType TargetType);
} // namespace rcc
#endif // RCC_CODEGEN_GLOBALISEL_UTILS_H
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