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//===- ARMLatencyMutations.h - ARM Latency Mutations ----------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
/// \file This file contains the ARM definition DAG scheduling mutations which
/// change inter-instruction latencies
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_ARM_LATENCYMUTATIONS_H
#define LLVM_LIB_TARGET_ARM_LATENCYMUTATIONS_H
#include "llvm/CodeGen/MachineScheduler.h"
#include "llvm/CodeGen/ScheduleDAGMutation.h"
namespace llvm {
class AAResults;
class ARMBaseInstrInfo;
/// Post-process the DAG to create cluster edges between instrs that may
/// be fused by the processor into a single operation.
class ARMOverrideBypasses : public ScheduleDAGMutation {
public:
ARMOverrideBypasses(const ARMBaseInstrInfo *t, AAResults *a)
: ScheduleDAGMutation(), TII(t), AA(a) {}
void apply(ScheduleDAGInstrs *DAGInstrs) override;
private:
virtual void modifyBypasses(SUnit &) = 0;
protected:
const ARMBaseInstrInfo *TII;
AAResults *AA;
ScheduleDAGInstrs *DAG = nullptr;
static void setBidirLatencies(SUnit &SrcSU, SDep &SrcDep, unsigned latency);
static bool zeroOutputDependences(SUnit &ISU, SDep &Dep);
unsigned makeBundleAssumptions(SUnit &ISU, SDep &Dep);
bool memoryRAWHazard(SUnit &ISU, SDep &Dep, unsigned latency);
};
/// Note that you have to add:
/// DAG.addMutation(createARMLatencyMutation(ST, AA));
/// to ARMPassConfig::createMachineScheduler() to have an effect.
std::unique_ptr<ScheduleDAGMutation>
createARMLatencyMutations(const class ARMSubtarget &, AAResults *AA);
} // namespace llvm
#endif
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