1 //===--- AArch64Subtarget.h - Define Subtarget for the AArch64 -*- 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 AArch64 specific subclass of TargetSubtarget.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #ifndef LLVM_LIB_TARGET_AARCH64_AARCH64SUBTARGET_H
15 #define LLVM_LIB_TARGET_AARCH64_AARCH64SUBTARGET_H
16 
17 #include "AArch64FrameLowering.h"
18 #include "AArch64ISelLowering.h"
19 #include "AArch64InstrInfo.h"
20 #include "AArch64RegisterInfo.h"
21 #include "AArch64SelectionDAGInfo.h"
22 #include "llvm/IR/DataLayout.h"
23 #include "llvm/Target/TargetSubtargetInfo.h"
24 #include <string>
25 
26 #define GET_SUBTARGETINFO_HEADER
27 #include "AArch64GenSubtargetInfo.inc"
28 
29 namespace llvm {
30 class GlobalValue;
31 class StringRef;
32 
33 class AArch64Subtarget : public AArch64GenSubtargetInfo {
34 protected:
35   enum ARMProcFamilyEnum {Others, CortexA53, CortexA57, Cyclone};
36 
37   /// ARMProcFamily - ARM processor family: Cortex-A53, Cortex-A57, and others.
38   ARMProcFamilyEnum ARMProcFamily;
39 
40   bool HasV8_1aOps;
41 
42   bool HasFPARMv8;
43   bool HasNEON;
44   bool HasCrypto;
45   bool HasCRC;
46 
47   // HasZeroCycleRegMove - Has zero-cycle register mov instructions.
48   bool HasZeroCycleRegMove;
49 
50   // HasZeroCycleZeroing - Has zero-cycle zeroing instructions.
51   bool HasZeroCycleZeroing;
52 
53   bool IsLittle;
54 
55   /// CPUString - String name of used CPU.
56   std::string CPUString;
57 
58   /// TargetTriple - What processor and OS we're targeting.
59   Triple TargetTriple;
60 
61   AArch64FrameLowering FrameLowering;
62   AArch64InstrInfo InstrInfo;
63   AArch64SelectionDAGInfo TSInfo;
64   AArch64TargetLowering TLInfo;
65 private:
66   /// initializeSubtargetDependencies - Initializes using CPUString and the
67   /// passed in feature string so that we can use initializer lists for
68   /// subtarget initialization.
69   AArch64Subtarget &initializeSubtargetDependencies(StringRef FS);
70 
71 public:
72   /// This constructor initializes the data members to match that
73   /// of the specified triple.
74   AArch64Subtarget(const std::string &TT, const std::string &CPU,
75                    const std::string &FS, const TargetMachine &TM,
76                    bool LittleEndian);
77 
getSelectionDAGInfo()78   const AArch64SelectionDAGInfo *getSelectionDAGInfo() const override {
79     return &TSInfo;
80   }
getFrameLowering()81   const AArch64FrameLowering *getFrameLowering() const override {
82     return &FrameLowering;
83   }
getTargetLowering()84   const AArch64TargetLowering *getTargetLowering() const override {
85     return &TLInfo;
86   }
getInstrInfo()87   const AArch64InstrInfo *getInstrInfo() const override { return &InstrInfo; }
getRegisterInfo()88   const AArch64RegisterInfo *getRegisterInfo() const override {
89     return &getInstrInfo()->getRegisterInfo();
90   }
getTargetTriple()91   const Triple &getTargetTriple() const { return TargetTriple; }
enableMachineScheduler()92   bool enableMachineScheduler() const override { return true; }
enablePostMachineScheduler()93   bool enablePostMachineScheduler() const override {
94     return isCortexA53() || isCortexA57();
95   }
96 
hasV8_1aOps()97   bool hasV8_1aOps() const { return HasV8_1aOps; }
98 
hasZeroCycleRegMove()99   bool hasZeroCycleRegMove() const { return HasZeroCycleRegMove; }
100 
hasZeroCycleZeroing()101   bool hasZeroCycleZeroing() const { return HasZeroCycleZeroing; }
102 
hasFPARMv8()103   bool hasFPARMv8() const { return HasFPARMv8; }
hasNEON()104   bool hasNEON() const { return HasNEON; }
hasCrypto()105   bool hasCrypto() const { return HasCrypto; }
hasCRC()106   bool hasCRC() const { return HasCRC; }
107 
isLittleEndian()108   bool isLittleEndian() const { return IsLittle; }
109 
isTargetDarwin()110   bool isTargetDarwin() const { return TargetTriple.isOSDarwin(); }
isTargetIOS()111   bool isTargetIOS() const { return TargetTriple.isiOS(); }
isTargetLinux()112   bool isTargetLinux() const { return TargetTriple.isOSLinux(); }
isTargetWindows()113   bool isTargetWindows() const { return TargetTriple.isOSWindows(); }
114 
isTargetCOFF()115   bool isTargetCOFF() const { return TargetTriple.isOSBinFormatCOFF(); }
isTargetELF()116   bool isTargetELF() const { return TargetTriple.isOSBinFormatELF(); }
isTargetMachO()117   bool isTargetMachO() const { return TargetTriple.isOSBinFormatMachO(); }
118 
isCyclone()119   bool isCyclone() const { return CPUString == "cyclone"; }
isCortexA57()120   bool isCortexA57() const { return CPUString == "cortex-a57"; }
isCortexA53()121   bool isCortexA53() const { return CPUString == "cortex-a53"; }
122 
useAA()123   bool useAA() const override { return isCortexA53(); }
124 
125   /// getMaxInlineSizeThreshold - Returns the maximum memset / memcpy size
126   /// that still makes it profitable to inline the call.
getMaxInlineSizeThreshold()127   unsigned getMaxInlineSizeThreshold() const { return 64; }
128 
129   /// ParseSubtargetFeatures - Parses features string setting specified
130   /// subtarget options.  Definition of function is auto generated by tblgen.
131   void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
132 
133   /// ClassifyGlobalReference - Find the target operand flags that describe
134   /// how a global value should be referenced for the current subtarget.
135   unsigned char ClassifyGlobalReference(const GlobalValue *GV,
136                                         const TargetMachine &TM) const;
137 
138   /// This function returns the name of a function which has an interface
139   /// like the non-standard bzero function, if such a function exists on
140   /// the current subtarget and it is considered prefereable over
141   /// memset with zero passed as the second argument. Otherwise it
142   /// returns null.
143   const char *getBZeroEntry() const;
144 
145   void overrideSchedPolicy(MachineSchedPolicy &Policy, MachineInstr *begin,
146                            MachineInstr *end,
147                            unsigned NumRegionInstrs) const override;
148 
149   bool enableEarlyIfConversion() const override;
150 
151   std::unique_ptr<PBQPRAConstraint> getCustomPBQPConstraints() const override;
152 };
153 } // End llvm namespace
154 
155 #endif
156