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 18 namespace llvm { 19 20 class ARMBaseInstrInfo; 21 class ARMBaseRegisterInfo; 22 class ARMSubtarget; 23 class 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. 29 class ARMHazardRecognizer : public ScoreboardHazardRecognizer { 30 MachineInstr *LastMI = nullptr; 31 unsigned FpMLxStalls = 0; 32 33 public: 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