llvm/llvm/lib/Target/Mips/MipsExpandPseudo.cpp

//===-- MipsExpandPseudoInsts.cpp - Expand pseudo instructions ------------===//
//
// 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 pseudo instructions into target
// instructions to allow proper scheduling, if-conversion, and other late
// optimizations. This pass should be run after register allocation but before
// the post-regalloc scheduling pass.
//
// This is currently only used for expanding atomic pseudos after register
// allocation. We do this to avoid the fast register allocator introducing
// spills between ll and sc. These stores cause some MIPS implementations to
// abort the atomic RMW sequence.
//
//===----------------------------------------------------------------------===//

#include "Mips.h"
#include "MipsInstrInfo.h"
#include "MipsSubtarget.h"
#include "llvm/CodeGen/LivePhysRegs.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"

usingnamespacellvm;

#define DEBUG_TYPE …

namespace {
  class MipsExpandPseudo : public MachineFunctionPass { … };
  char MipsExpandPseudo::ID = …;
}

bool MipsExpandPseudo::expandAtomicCmpSwapSubword(
    MachineBasicBlock &BB, MachineBasicBlock::iterator I,
    MachineBasicBlock::iterator &NMBBI) { … }

bool MipsExpandPseudo::expandAtomicCmpSwap(MachineBasicBlock &BB,
                                           MachineBasicBlock::iterator I,
                                           MachineBasicBlock::iterator &NMBBI) { … }

bool MipsExpandPseudo::expandAtomicBinOpSubword(
    MachineBasicBlock &BB, MachineBasicBlock::iterator I,
    MachineBasicBlock::iterator &NMBBI) { … }

bool MipsExpandPseudo::expandAtomicBinOp(MachineBasicBlock &BB,
                                         MachineBasicBlock::iterator I,
                                         MachineBasicBlock::iterator &NMBBI,
                                         unsigned Size) { … }

bool MipsExpandPseudo::expandMI(MachineBasicBlock &MBB,
                                MachineBasicBlock::iterator MBBI,
                                MachineBasicBlock::iterator &NMBB) { … }

bool MipsExpandPseudo::expandMBB(MachineBasicBlock &MBB) { … }

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

/// createMipsExpandPseudoPass - returns an instance of the pseudo instruction
/// expansion pass.
FunctionPass *llvm::createMipsExpandPseudoPass() { … }