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// SPDX-License-Identifier: GPL-3.0-or-later
#ifndef RCC_CODEGEN_REGISTERSCAVENGER_H
#define RCC_CODEGEN_REGISTERSCAVENGER_H
#include "rcc/CodeGen/Register.h"
#include "rcc/Support/Error.h"
#include <span>
namespace rcc {
class MachineFunction;
class MachineInstr;
class TargetDescription;
struct ScavengedRegister final {
PhysicalRegister Reg;
bool RequiresSpill = false;
};
class RegisterScavenger final {
public:
RegisterScavenger(const MachineFunction &Function, const TargetDescription &Target) noexcept
: Function(&Function), Target(&Target) {}
[[nodiscard]] Expected<ScavengedRegister>
scavenge(const MachineInstr &Instruction, std::span<const PhysicalRegister> Candidates) const;
private:
[[nodiscard]] Expected<bool> isLiveBefore(const MachineInstr &Instruction,
PhysicalRegister Reg) const;
[[nodiscard]] bool instructionUses(const MachineInstr &Instruction,
PhysicalRegister Reg) const noexcept;
const MachineFunction *Function;
const TargetDescription *Target;
};
} // namespace rcc
#endif // RCC_CODEGEN_REGISTERSCAVENGER_H
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