llvm/llvm/lib/CodeGen/DeadMachineInstructionElim.cpp

//===- DeadMachineInstructionElim.cpp - Remove dead machine 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 is an extremely simple MachineInstr-level dead-code-elimination pass.
//
//===----------------------------------------------------------------------===//

#include "llvm/CodeGen/DeadMachineInstructionElim.h"
#include "llvm/ADT/PostOrderIterator.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/CodeGen/LiveRegUnits.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/TargetSubtargetInfo.h"
#include "llvm/InitializePasses.h"
#include "llvm/Pass.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"

usingnamespacellvm;

#define DEBUG_TYPE …

STATISTIC(NumDeletes,          "Number of dead instructions deleted");

namespace {
class DeadMachineInstructionElimImpl { … };

class DeadMachineInstructionElim : public MachineFunctionPass { … };
} // namespace

PreservedAnalyses
DeadMachineInstructionElimPass::run(MachineFunction &MF,
                                    MachineFunctionAnalysisManager &) { … }

char DeadMachineInstructionElim::ID = …;
char &llvm::DeadMachineInstructionElimID = …;

INITIALIZE_PASS(…)

bool DeadMachineInstructionElimImpl::isDead(const MachineInstr *MI) const { … }

bool DeadMachineInstructionElimImpl::runImpl(MachineFunction &MF) { … }

bool DeadMachineInstructionElimImpl::eliminateDeadMI(MachineFunction &MF) { … }