HexagonSubtarget.h revision 296417 
1//===-- HexagonSubtarget.h - Define Subtarget for the Hexagon ---*- 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 declares the Hexagon specific subclass of TargetSubtarget.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef LLVM_LIB_TARGET_HEXAGON_HEXAGONSUBTARGET_H
15#define LLVM_LIB_TARGET_HEXAGON_HEXAGONSUBTARGET_H
16
17#include "HexagonFrameLowering.h"
18#include "HexagonISelLowering.h"
19#include "HexagonInstrInfo.h"
20#include "HexagonSelectionDAGInfo.h"
21#include "llvm/IR/DataLayout.h"
22#include "llvm/Target/TargetMachine.h"
23#include "llvm/Target/TargetSubtargetInfo.h"
24#include <string>
25
26#define GET_SUBTARGETINFO_HEADER
27#include "HexagonGenSubtargetInfo.inc"
28
29#define Hexagon_SMALL_DATA_THRESHOLD 8
30#define Hexagon_SLOTS 4
31
32namespace llvm {
33
34class HexagonSubtarget : public HexagonGenSubtargetInfo {
35  virtual void anchor();
36
37  bool UseMemOps, UseHVXOps, UseHVXDblOps;
38  bool ModeIEEERndNear;
39
40public:
41  enum HexagonArchEnum {
42    V4, V5, V55, V60
43  };
44
45  HexagonArchEnum HexagonArchVersion;
46  /// True if the target should use Back-Skip-Back scheduling. This is the
47  /// default for V60.
48  bool UseBSBScheduling;
49
50private:
51  std::string CPUString;
52  HexagonInstrInfo InstrInfo;
53  HexagonTargetLowering TLInfo;
54  HexagonSelectionDAGInfo TSInfo;
55  HexagonFrameLowering FrameLowering;
56  InstrItineraryData InstrItins;
57  void initializeEnvironment();
58
59public:
60  HexagonSubtarget(const Triple &TT, StringRef CPU, StringRef FS,
61                   const TargetMachine &TM);
62
63  /// getInstrItins - Return the instruction itineraries based on subtarget
64  /// selection.
65  const InstrItineraryData *getInstrItineraryData() const override {
66    return &InstrItins;
67  }
68  const HexagonInstrInfo *getInstrInfo() const override { return &InstrInfo; }
69  const HexagonRegisterInfo *getRegisterInfo() const override {
70    return &InstrInfo.getRegisterInfo();
71  }
72  const HexagonTargetLowering *getTargetLowering() const override {
73    return &TLInfo;
74  }
75  const HexagonFrameLowering *getFrameLowering() const override {
76    return &FrameLowering;
77  }
78  const HexagonSelectionDAGInfo *getSelectionDAGInfo() const override {
79    return &TSInfo;
80  }
81
82  HexagonSubtarget &initializeSubtargetDependencies(StringRef CPU,
83                                                    StringRef FS);
84
85  /// ParseSubtargetFeatures - Parses features string setting specified
86  /// subtarget options.  Definition of function is auto generated by tblgen.
87  void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
88
89  bool useMemOps() const { return UseMemOps; }
90  bool hasV5TOps() const { return getHexagonArchVersion() >= V5; }
91  bool hasV5TOpsOnly() const { return getHexagonArchVersion() == V5; }
92  bool hasV55TOps() const { return getHexagonArchVersion() >= V55; }
93  bool hasV55TOpsOnly() const { return getHexagonArchVersion() == V55; }
94  bool hasV60TOps() const { return getHexagonArchVersion() >= V60; }
95  bool hasV60TOpsOnly() const { return getHexagonArchVersion() == V60; }
96  bool modeIEEERndNear() const { return ModeIEEERndNear; }
97  bool useHVXOps() const { return UseHVXOps; }
98  bool useHVXDblOps() const { return UseHVXOps && UseHVXDblOps; }
99  bool useHVXSglOps() const { return UseHVXOps && !UseHVXDblOps; }
100
101  bool useBSBScheduling() const { return UseBSBScheduling; }
102  bool enableMachineScheduler() const override;
103  // Always use the TargetLowering default scheduler.
104  // FIXME: This will use the vliw scheduler which is probably just hurting
105  // compiler time and will be removed eventually anyway.
106  bool enableMachineSchedDefaultSched() const override { return false; }
107
108  const std::string &getCPUString () const { return CPUString; }
109
110  // Threshold for small data section
111  unsigned getSmallDataThreshold() const {
112    return Hexagon_SMALL_DATA_THRESHOLD;
113  }
114  const HexagonArchEnum &getHexagonArchVersion() const {
115    return HexagonArchVersion;
116  }
117};
118
119} // end namespace llvm
120
121#endif
122