LoongArchInstrInfo.cpp

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//=- LoongArchInstrInfo.cpp - LoongArch Instruction Information -*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file contains the LoongArch implementation of the TargetInstrInfo class.
//
//===----------------------------------------------------------------------===//
 
#include "LoongArchInstrInfo.h"
#include "LoongArch.h"
 
using namespace llvm;
 
#define GET_INSTRINFO_CTOR_DTOR
#include "LoongArchGenInstrInfo.inc"
 
LoongArchInstrInfo::LoongArchInstrInfo(LoongArchSubtarget &STI)
    // FIXME: add CFSetup and CFDestroy Inst when we implement function call.
    : LoongArchGenInstrInfo() {}
 
void LoongArchInstrInfo::copyPhysReg(MachineBasicBlock &MBB,
                                     MachineBasicBlock::iterator MBBI,
                                     const DebugLoc &DL, MCRegister DstReg,
                                     MCRegister SrcReg, bool KillSrc) const {
  if (LoongArch::GPRRegClass.contains(DstReg, SrcReg)) {
    BuildMI(MBB, MBBI, DL, get(LoongArch::OR), DstReg)
        .addReg(SrcReg, getKillRegState(KillSrc))
        .addReg(LoongArch::R0);
    return;
  }
 
  // FPR->FPR copies.
  unsigned Opc;
  if (LoongArch::FPR32RegClass.contains(DstReg, SrcReg)) {
    Opc = LoongArch::FMOV_S;
  } else if (LoongArch::FPR64RegClass.contains(DstReg, SrcReg)) {
    Opc = LoongArch::FMOV_D;
  } else {
    // TODO: support other copies.
    llvm_unreachable("Impossible reg-to-reg copy");
  }
 
  BuildMI(MBB, MBBI, DL, get(Opc), DstReg)
      .addReg(SrcReg, getKillRegState(KillSrc));
}