1 //===-- ARMHazardRecognizer.h - ARM Hazard Recognizers ----------*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file defines hazard recognizers for scheduling ARM functions.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #ifndef ARMHAZARDRECOGNIZER_H
15 #define ARMHAZARDRECOGNIZER_H
16 
17 #include "llvm/CodeGen/ScoreboardHazardRecognizer.h"
18 
19 namespace llvm {
20 
21 class ARMBaseInstrInfo;
22 class ARMBaseRegisterInfo;
23 class ARMSubtarget;
24 class MachineInstr;
25 
26 class ARMHazardRecognizer : public ScoreboardHazardRecognizer {
27   const ARMBaseInstrInfo &TII;
28   const ARMBaseRegisterInfo &TRI;
29   const ARMSubtarget &STI;
30 
31   MachineInstr *LastMI;
32   unsigned FpMLxStalls;
33   unsigned ITBlockSize;  // No. of MIs in current IT block yet to be scheduled.
34   MachineInstr *ITBlockMIs[4];
35 
36 public:
ARMHazardRecognizer(const InstrItineraryData * ItinData,const ARMBaseInstrInfo & tii,const ARMBaseRegisterInfo & tri,const ARMSubtarget & sti,const ScheduleDAG * DAG)37   ARMHazardRecognizer(const InstrItineraryData *ItinData,
38                       const ARMBaseInstrInfo &tii,
39                       const ARMBaseRegisterInfo &tri,
40                       const ARMSubtarget &sti,
41                       const ScheduleDAG *DAG) :
42     ScoreboardHazardRecognizer(ItinData, DAG, "post-RA-sched"), TII(tii),
43     TRI(tri), STI(sti), LastMI(0), ITBlockSize(0) {}
44 
45   virtual HazardType getHazardType(SUnit *SU, int Stalls);
46   virtual void Reset();
47   virtual void EmitInstruction(SUnit *SU);
48   virtual void AdvanceCycle();
49   virtual void RecedeCycle();
50 };
51 
52 } // end namespace llvm
53 
54 #endif // ARMHAZARDRECOGNIZER_H
55