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 
32 namespace llvm {
33 
34 class HexagonSubtarget : public HexagonGenSubtargetInfo {
35   virtual void anchor();
36 
37   bool UseMemOps;
38   bool ModeIEEERndNear;
39 
40 public:
41   enum HexagonArchEnum {
42     V4, V5
43   };
44 
45   HexagonArchEnum HexagonArchVersion;
46 private:
47   std::string CPUString;
48   HexagonInstrInfo InstrInfo;
49   HexagonTargetLowering TLInfo;
50   HexagonSelectionDAGInfo TSInfo;
51   HexagonFrameLowering FrameLowering;
52   InstrItineraryData InstrItins;
53 
54 public:
55   HexagonSubtarget(StringRef TT, StringRef CPU, StringRef FS,
56                    const TargetMachine &TM);
57 
58   /// getInstrItins - Return the instruction itineraries based on subtarget
59   /// selection.
getInstrItineraryData()60   const InstrItineraryData *getInstrItineraryData() const override {
61     return &InstrItins;
62   }
getInstrInfo()63   const HexagonInstrInfo *getInstrInfo() const override { return &InstrInfo; }
getRegisterInfo()64   const HexagonRegisterInfo *getRegisterInfo() const override {
65     return &InstrInfo.getRegisterInfo();
66   }
getTargetLowering()67   const HexagonTargetLowering *getTargetLowering() const override {
68     return &TLInfo;
69   }
getFrameLowering()70   const HexagonFrameLowering *getFrameLowering() const override {
71     return &FrameLowering;
72   }
getSelectionDAGInfo()73   const HexagonSelectionDAGInfo *getSelectionDAGInfo() const override {
74     return &TSInfo;
75   }
76 
77   HexagonSubtarget &initializeSubtargetDependencies(StringRef CPU,
78                                                     StringRef FS);
79 
80   /// ParseSubtargetFeatures - Parses features string setting specified
81   /// subtarget options.  Definition of function is auto generated by tblgen.
82   void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
83 
useMemOps()84   bool useMemOps() const { return UseMemOps; }
hasV5TOps()85   bool hasV5TOps() const { return getHexagonArchVersion() >= V5; }
hasV5TOpsOnly()86   bool hasV5TOpsOnly() const { return getHexagonArchVersion() == V5; }
modeIEEERndNear()87   bool modeIEEERndNear() const { return ModeIEEERndNear; }
88   bool enableMachineScheduler() const override;
89   // Always use the TargetLowering default scheduler.
90   // FIXME: This will use the vliw scheduler which is probably just hurting
91   // compiler time and will be removed eventually anyway.
enableMachineSchedDefaultSched()92   bool enableMachineSchedDefaultSched() const override { return false; }
93 
getCPUString()94   const std::string &getCPUString () const { return CPUString; }
95 
96   // Threshold for small data section
getSmallDataThreshold()97   unsigned getSmallDataThreshold() const {
98     return Hexagon_SMALL_DATA_THRESHOLD;
99   }
getHexagonArchVersion()100   const HexagonArchEnum &getHexagonArchVersion() const {
101     return  HexagonArchVersion;
102   }
103 };
104 
105 } // end namespace llvm
106 
107 #endif
108