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//===- MipsRegisterBankInfo.cpp ---------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
/// \file
/// This file implements the targeting of the RegisterBankInfo class for Mips.
/// \todo This should be generated by TableGen.
//===----------------------------------------------------------------------===//
#include "MipsInstrInfo.h"
#include "MipsRegisterBankInfo.h"
#include "llvm/CodeGen/GlobalISel/RegisterBank.h"
#include "llvm/CodeGen/GlobalISel/RegisterBankInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/TargetRegisterInfo.h"
#define GET_TARGET_REGBANK_IMPL
#define DEBUG_TYPE "registerbankinfo"
#include "MipsGenRegisterBank.inc"
namespace llvm {
namespace Mips {
enum PartialMappingIdx {
PMI_GPR,
PMI_Min = PMI_GPR,
};
RegisterBankInfo::PartialMapping PartMappings[]{
{0, 32, GPRBRegBank}
};
enum ValueMappingIdx { InvalidIdx = 0, GPRIdx = 1 };
RegisterBankInfo::ValueMapping ValueMappings[] = {
// invalid
{nullptr, 0},
// 3 operands in GPRs
{&PartMappings[PMI_GPR - PMI_Min], 1},
{&PartMappings[PMI_GPR - PMI_Min], 1},
{&PartMappings[PMI_GPR - PMI_Min], 1}};
} // end namespace Mips
} // end namespace llvm
using namespace llvm;
MipsRegisterBankInfo::MipsRegisterBankInfo(const TargetRegisterInfo &TRI)
: MipsGenRegisterBankInfo() {}
const RegisterBank &MipsRegisterBankInfo::getRegBankFromRegClass(
const TargetRegisterClass &RC) const {
using namespace Mips;
switch (RC.getID()) {
case Mips::GPR32RegClassID:
case Mips::CPU16Regs_and_GPRMM16ZeroRegClassID:
case Mips::GPRMM16MoveP_and_CPU16Regs_and_GPRMM16ZeroRegClassID:
return getRegBank(Mips::GPRBRegBankID);
default:
llvm_unreachable("Register class not supported");
}
}
const RegisterBankInfo::InstructionMapping &
MipsRegisterBankInfo::getInstrMapping(const MachineInstr &MI) const {
unsigned Opc = MI.getOpcode();
const RegisterBankInfo::InstructionMapping &Mapping = getInstrMappingImpl(MI);
if (Mapping.isValid())
return Mapping;
using namespace TargetOpcode;
unsigned NumOperands = MI.getNumOperands();
const ValueMapping *OperandsMapping = &Mips::ValueMappings[Mips::GPRIdx];
switch (Opc) {
case G_ADD:
OperandsMapping = &Mips::ValueMappings[Mips::GPRIdx];
break;
default:
return getInvalidInstructionMapping();
}
return getInstructionMapping(DefaultMappingID, /*Cost=*/1, OperandsMapping,
NumOperands);
}
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