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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, UseHVXOps, UseHVXDblOps;
38   bool ModeIEEERndNear;
39 
40 public:
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 
50 private:
51   std::string CPUString;
52   HexagonInstrInfo InstrInfo;
53   HexagonTargetLowering TLInfo;
54   HexagonSelectionDAGInfo TSInfo;
55   HexagonFrameLowering FrameLowering;
56   InstrItineraryData InstrItins;
57   void initializeEnvironment();
58 
59 public:
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.
getInstrItineraryData()65   const InstrItineraryData *getInstrItineraryData() const override {
66     return &InstrItins;
67   }
getInstrInfo()68   const HexagonInstrInfo *getInstrInfo() const override { return &InstrInfo; }
getRegisterInfo()69   const HexagonRegisterInfo *getRegisterInfo() const override {
70     return &InstrInfo.getRegisterInfo();
71   }
getTargetLowering()72   const HexagonTargetLowering *getTargetLowering() const override {
73     return &TLInfo;
74   }
getFrameLowering()75   const HexagonFrameLowering *getFrameLowering() const override {
76     return &FrameLowering;
77   }
getSelectionDAGInfo()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 
useMemOps()89   bool useMemOps() const { return UseMemOps; }
hasV5TOps()90   bool hasV5TOps() const { return getHexagonArchVersion() >= V5; }
hasV5TOpsOnly()91   bool hasV5TOpsOnly() const { return getHexagonArchVersion() == V5; }
hasV55TOps()92   bool hasV55TOps() const { return getHexagonArchVersion() >= V55; }
hasV55TOpsOnly()93   bool hasV55TOpsOnly() const { return getHexagonArchVersion() == V55; }
hasV60TOps()94   bool hasV60TOps() const { return getHexagonArchVersion() >= V60; }
hasV60TOpsOnly()95   bool hasV60TOpsOnly() const { return getHexagonArchVersion() == V60; }
modeIEEERndNear()96   bool modeIEEERndNear() const { return ModeIEEERndNear; }
useHVXOps()97   bool useHVXOps() const { return UseHVXOps; }
useHVXDblOps()98   bool useHVXDblOps() const { return UseHVXOps && UseHVXDblOps; }
useHVXSglOps()99   bool useHVXSglOps() const { return UseHVXOps && !UseHVXDblOps; }
100 
useBSBScheduling()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.
enableMachineSchedDefaultSched()106   bool enableMachineSchedDefaultSched() const override { return false; }
107 
getAntiDepBreakMode()108   AntiDepBreakMode getAntiDepBreakMode() const override { return ANTIDEP_ALL; }
enablePostRAScheduler()109   bool enablePostRAScheduler() const override { return true; }
110 
111   bool enableSubRegLiveness() const override;
112 
getCPUString()113   const std::string &getCPUString () const { return CPUString; }
114 
115   // Threshold for small data section
getSmallDataThreshold()116   unsigned getSmallDataThreshold() const {
117     return Hexagon_SMALL_DATA_THRESHOLD;
118   }
getHexagonArchVersion()119   const HexagonArchEnum &getHexagonArchVersion() const {
120     return HexagonArchVersion;
121   }
122 };
123 
124 } // end namespace llvm
125 
126 #endif
127