llvm/llvm/lib/Target/ARM/ARMOptimizeBarriersPass.cpp

//===-- ARMOptimizeBarriersPass - two DMBs without a memory access in between,
//removed one -===//
//
// 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
//
//===------------------------------------------------------------------------------------------===//

#include "ARM.h"
#include "ARMInstrInfo.h"
#include "ARMMachineFunctionInfo.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
usingnamespacellvm;

#define DEBUG_TYPE …

STATISTIC(NumDMBsRemoved, "Number of DMBs removed");

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

// Returns whether the instruction can safely move past a DMB instruction
// The current implementation allows this iif MI does not have any possible
// memory access
static bool CanMovePastDMB(const MachineInstr *MI) { … }

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

/// createARMOptimizeBarriersPass - Returns an instance of the remove double
/// barriers
/// pass.
FunctionPass *llvm::createARMOptimizeBarriersPass() { … }