llvm/llvm/lib/Target/PowerPC/PPCExpandAtomicPseudoInsts.cpp

//===-- PPCExpandAtomicPseudoInsts.cpp - Expand atomic pseudo instrs. -----===//
//
// 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 a pass that expands atomic pseudo instructions into
// target instructions post RA. With such method, LL/SC loop is considered as
// a whole blob and make spilling unlikely happens in the LL/SC loop.
//
//===----------------------------------------------------------------------===//

#include "MCTargetDesc/PPCPredicates.h"
#include "PPC.h"
#include "PPCInstrInfo.h"
#include "PPCTargetMachine.h"

#include "llvm/CodeGen/LivePhysRegs.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"

usingnamespacellvm;

#define DEBUG_TYPE …

namespace {

class PPCExpandAtomicPseudo : public MachineFunctionPass { … };

static void PairedCopy(const PPCInstrInfo *TII, MachineBasicBlock &MBB,
                       MachineBasicBlock::iterator MBBI, const DebugLoc &DL,
                       Register Dest0, Register Dest1, Register Src0,
                       Register Src1) { … }

bool PPCExpandAtomicPseudo::runOnMachineFunction(MachineFunction &MF) { … }

bool PPCExpandAtomicPseudo::expandMI(MachineBasicBlock &MBB, MachineInstr &MI,
                                     MachineBasicBlock::iterator &NMBBI) { … }

bool PPCExpandAtomicPseudo::expandAtomicRMW128(
    MachineBasicBlock &MBB, MachineInstr &MI,
    MachineBasicBlock::iterator &NMBBI) { … }

bool PPCExpandAtomicPseudo::expandAtomicCmpSwap128(
    MachineBasicBlock &MBB, MachineInstr &MI,
    MachineBasicBlock::iterator &NMBBI) { … }

} // namespace

INITIALIZE_PASS(…)

char PPCExpandAtomicPseudo::ID = …;
FunctionPass *llvm::createPPCExpandAtomicPseudoPass() { … }