AArch64Subtarget.h revision cd81d94322a39503e4a3e87b6ee03d4fcb3465fb 
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 AArch64SUBTARGET_H
15#define AArch64SUBTARGET_H
16
17#include "AArch64InstrInfo.h"
18#include "AArch64FrameLowering.h"
19#include "AArch64ISelLowering.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
29namespace llvm {
30class GlobalValue;
31class StringRef;
32
33class AArch64Subtarget : public AArch64GenSubtargetInfo {
34protected:
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 HasFPARMv8;
41  bool HasNEON;
42  bool HasCrypto;
43  bool HasCRC;
44
45  // HasZeroCycleRegMove - Has zero-cycle register mov instructions.
46  bool HasZeroCycleRegMove;
47
48  // HasZeroCycleZeroing - Has zero-cycle zeroing instructions.
49  bool HasZeroCycleZeroing;
50
51  /// CPUString - String name of used CPU.
52  std::string CPUString;
53
54  /// TargetTriple - What processor and OS we're targeting.
55  Triple TargetTriple;
56
57  const DataLayout DL;
58  AArch64FrameLowering FrameLowering;
59  AArch64InstrInfo InstrInfo;
60  AArch64SelectionDAGInfo TSInfo;
61  AArch64TargetLowering TLInfo;
62private:
63  /// initializeSubtargetDependencies - Initializes using CPUString and the
64  /// passed in feature string so that we can use initializer lists for
65  /// subtarget initialization.
66  AArch64Subtarget &initializeSubtargetDependencies(StringRef FS);
67
68public:
69  /// This constructor initializes the data members to match that
70  /// of the specified triple.
71  AArch64Subtarget(const std::string &TT, const std::string &CPU,
72		   const std::string &FS, TargetMachine &TM, bool LittleEndian);
73
74  const AArch64SelectionDAGInfo *getSelectionDAGInfo() const { return &TSInfo; }
75  const AArch64FrameLowering *getFrameLowering() const {
76    return &FrameLowering;
77  }
78  const AArch64TargetLowering *getTargetLowering() const {
79    return &TLInfo;
80  }
81  const AArch64InstrInfo *getInstrInfo() const { return &InstrInfo; }
82  const DataLayout *getDataLayout() const { return &DL; }
83  bool enableMachineScheduler() const override { return true; }
84
85  bool hasZeroCycleRegMove() const { return HasZeroCycleRegMove; }
86
87  bool hasZeroCycleZeroing() const { return HasZeroCycleZeroing; }
88
89  bool hasFPARMv8() const { return HasFPARMv8; }
90  bool hasNEON() const { return HasNEON; }
91  bool hasCrypto() const { return HasCrypto; }
92  bool hasCRC() const { return HasCRC; }
93
94  bool isLittleEndian() const { return DL.isLittleEndian(); }
95
96  bool isTargetDarwin() const { return TargetTriple.isOSDarwin(); }
97
98  bool isTargetELF() const { return TargetTriple.isOSBinFormatELF(); }
99
100  bool isTargetMachO() const { return TargetTriple.isOSBinFormatMachO(); }
101
102  bool isCyclone() const { return CPUString == "cyclone"; }
103
104  /// getMaxInlineSizeThreshold - Returns the maximum memset / memcpy size
105  /// that still makes it profitable to inline the call.
106  unsigned getMaxInlineSizeThreshold() const { return 64; }
107
108  /// ParseSubtargetFeatures - Parses features string setting specified
109  /// subtarget options.  Definition of function is auto generated by tblgen.
110  void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
111
112  /// ClassifyGlobalReference - Find the target operand flags that describe
113  /// how a global value should be referenced for the current subtarget.
114  unsigned char ClassifyGlobalReference(const GlobalValue *GV,
115                                        const TargetMachine &TM) const;
116
117  /// This function returns the name of a function which has an interface
118  /// like the non-standard bzero function, if such a function exists on
119  /// the current subtarget and it is considered prefereable over
120  /// memset with zero passed as the second argument. Otherwise it
121  /// returns null.
122  const char *getBZeroEntry() const;
123
124  void overrideSchedPolicy(MachineSchedPolicy &Policy, MachineInstr *begin,
125                           MachineInstr *end,
126                           unsigned NumRegionInstrs) const override;
127
128  bool enableEarlyIfConversion() const override;
129};
130} // End llvm namespace
131
132#endif // AArch64SUBTARGET_H
133