llvm/llvm/lib/Target/Hexagon/HexagonHazardRecognizer.cpp

//===-- HexagonHazardRecognizer.cpp - Hexagon Post RA Hazard Recognizer ---===//
//
// 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 defines the hazard recognizer for scheduling on Hexagon.
// Use a DFA based hazard recognizer.
//
//===----------------------------------------------------------------------===//

#include "HexagonHazardRecognizer.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineOperand.h"
#include "llvm/CodeGen/ScheduleDAG.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include <cassert>

usingnamespacellvm;

#define DEBUG_TYPE …

void HexagonHazardRecognizer::Reset() { … }

ScheduleHazardRecognizer::HazardType
HexagonHazardRecognizer::getHazardType(SUnit *SU, int stalls) { … }

void HexagonHazardRecognizer::AdvanceCycle() { … }

/// Handle the cases when we prefer one instruction over another. Case 1 - we
/// prefer not to generate multiple loads in the packet to avoid a potential
/// bank conflict. Case 2 - if a packet contains a dot cur instruction, then we
/// prefer the instruction that can use the dot cur result. However, if the use
/// is not scheduled in the same packet, then prefer other instructions in the
/// subsequent packet. Case 3 - we prefer a vector store that can be converted
/// to a .new store. The packetizer will not generate the .new store if the
/// store doesn't have resources to fit in the packet (but the .new store may
/// have resources). We attempt to schedule the store as soon as possible to
/// help packetize the two instructions together.
bool HexagonHazardRecognizer::ShouldPreferAnother(SUnit *SU) { … }

/// Return true if the instruction would be converted to a new value store when
/// packetized.
bool HexagonHazardRecognizer::isNewStore(MachineInstr &MI) { … }

void HexagonHazardRecognizer::EmitInstruction(SUnit *SU) { … }