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// SPDX-License-Identifier: GPL-3.0-or-later
#ifndef RCC_CODEGEN_REGISTERBANKINFO_H
#define RCC_CODEGEN_REGISTERBANKINFO_H
#include "rcc/CodeGen/MachineIRTypes.h"
#include "rcc/CodeGen/Register.h"
#include "rcc/Support/Error.h"
#include <optional>
#include <vector>
namespace rcc {
class MachineFunction;
class MachineInstr;
class TargetDescription;
struct VirtualRegisterInfo;
struct RegisterBankSelection final {
RegisterBankID Bank;
bool IsConstrained = false;
};
using RegisterBankInstructionMapping = std::vector<std::optional<RegisterBankID>>;
class RegisterBankInfo {
public:
virtual ~RegisterBankInfo() = default;
[[nodiscard]] virtual Expected<RegisterBankSelection>
selectBank(const MachineFunction &Function, Register Reg, const VirtualRegisterInfo &Info,
const MachineInstr *Context, const TargetDescription &Target) const = 0;
[[nodiscard]] virtual Expected<RegisterBankInstructionMapping>
getInstructionMapping(const MachineInstr &, const MachineFunction &,
const TargetDescription &) const {
return RegisterBankInstructionMapping{};
}
// This hook rejects invalid mappings before register-bank state is published.
[[nodiscard]] virtual Expected<void> validateInstruction(const MachineInstr &,
const MachineFunction &,
const TargetDescription &) const {
return {};
}
};
} // namespace rcc
#endif // RCC_CODEGEN_REGISTERBANKINFO_H
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