llvm/llvm/lib/Target/X86/X86MacroFusion.cpp

//===- X86MacroFusion.cpp - X86 Macro Fusion ------------------------------===//
//
// 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 X86 implementation of the DAG scheduling
/// mutation to pair instructions back to back.
//
//===----------------------------------------------------------------------===//

#include "X86MacroFusion.h"
#include "MCTargetDesc/X86BaseInfo.h"
#include "X86Subtarget.h"
#include "llvm/CodeGen/MacroFusion.h"
#include "llvm/CodeGen/ScheduleDAGMutation.h"
#include "llvm/CodeGen/TargetInstrInfo.h"

usingnamespacellvm;

static X86::FirstMacroFusionInstKind classifyFirst(const MachineInstr &MI) { … }

static X86::SecondMacroFusionInstKind classifySecond(const MachineInstr &MI) { … }

/// Check if the instr pair, FirstMI and SecondMI, should be fused
/// together. Given SecondMI, when FirstMI is unspecified, then check if
/// SecondMI may be part of a fused pair at all.
static bool shouldScheduleAdjacent(const TargetInstrInfo &TII,
                                   const TargetSubtargetInfo &TSI,
                                   const MachineInstr *FirstMI,
                                   const MachineInstr &SecondMI) { … }

namespace llvm {

std::unique_ptr<ScheduleDAGMutation> createX86MacroFusionDAGMutation() { … }

} // end namespace llvm