1//===-- ARMHazardRecognizer.h - ARM Hazard Recognizers ----------*- C++ -*-===// 2// 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4// See https://llvm.org/LICENSE.txt for license information. 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6// 7//===----------------------------------------------------------------------===// 8// 9// This file defines hazard recognizers for scheduling ARM functions. 10// 11//===----------------------------------------------------------------------===// 12 13#ifndef LLVM_LIB_TARGET_ARM_ARMHAZARDRECOGNIZER_H 14#define LLVM_LIB_TARGET_ARM_ARMHAZARDRECOGNIZER_H 15 16#include "llvm/CodeGen/ScoreboardHazardRecognizer.h" 17 18namespace llvm { 19 20class ARMBaseInstrInfo; 21class ARMBaseRegisterInfo; 22class ARMSubtarget; 23class MachineInstr; 24 25/// ARMHazardRecognizer handles special constraints that are not expressed in 26/// the scheduling itinerary. This is only used during postRA scheduling. The 27/// ARM preRA scheduler uses an unspecialized instance of the 28/// ScoreboardHazardRecognizer. 29class ARMHazardRecognizer : public ScoreboardHazardRecognizer { 30 MachineInstr *LastMI = nullptr; 31 unsigned FpMLxStalls = 0; 32 33public: 34 ARMHazardRecognizer(const InstrItineraryData *ItinData, 35 const ScheduleDAG *DAG) 36 : ScoreboardHazardRecognizer(ItinData, DAG, "post-RA-sched") {} 37 38 HazardType getHazardType(SUnit *SU, int Stalls) override; 39 void Reset() override; 40 void EmitInstruction(SUnit *SU) override; 41 void AdvanceCycle() override; 42 void RecedeCycle() override; 43}; 44 45} // end namespace llvm 46 47#endif 48