1 //=====---- ARM64Subtarget.h - Define Subtarget for the ARM64 -*- C++ -*--====//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file declares the ARM64 specific subclass of TargetSubtarget.
12 //===----------------------------------------------------------------------===//
14 #ifndef ARM64SUBTARGET_H
15 #define ARM64SUBTARGET_H
17 #include "llvm/Target/TargetSubtargetInfo.h"
18 #include "ARM64RegisterInfo.h"
21 #define GET_SUBTARGETINFO_HEADER
22 #include "ARM64GenSubtargetInfo.inc"
28 class ARM64Subtarget : public ARM64GenSubtargetInfo {
30 // HasZeroCycleRegMove - Has zero-cycle register mov instructions.
31 bool HasZeroCycleRegMove;
33 // HasZeroCycleZeroing - Has zero-cycle zeroing instructions.
34 bool HasZeroCycleZeroing;
36 /// CPUString - String name of used CPU.
37 std::string CPUString;
39 /// TargetTriple - What processor and OS we're targeting.
43 /// This constructor initializes the data members to match that
44 /// of the specified triple.
45 ARM64Subtarget(const std::string &TT, const std::string &CPU,
46 const std::string &FS);
48 virtual bool enableMachineScheduler() const { return true; }
50 bool hasZeroCycleRegMove() const { return HasZeroCycleRegMove; }
52 bool hasZeroCycleZeroing() const { return HasZeroCycleZeroing; }
54 bool isTargetDarwin() const { return TargetTriple.isOSDarwin(); }
56 bool isTargetELF() const { return TargetTriple.isOSBinFormatELF(); }
58 bool isTargetMachO() const { return TargetTriple.isOSBinFormatMachO(); }
60 bool isCyclone() const { return CPUString == "cyclone"; }
62 /// getMaxInlineSizeThreshold - Returns the maximum memset / memcpy size
63 /// that still makes it profitable to inline the call.
64 unsigned getMaxInlineSizeThreshold() const { return 64; }
66 /// ParseSubtargetFeatures - Parses features string setting specified
67 /// subtarget options. Definition of function is auto generated by tblgen.
68 void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
70 /// ClassifyGlobalReference - Find the target operand flags that describe
71 /// how a global value should be referenced for the current subtarget.
72 unsigned char ClassifyGlobalReference(const GlobalValue *GV,
73 const TargetMachine &TM) const;
75 /// This function returns the name of a function which has an interface
76 /// like the non-standard bzero function, if such a function exists on
77 /// the current subtarget and it is considered prefereable over
78 /// memset with zero passed as the second argument. Otherwise it
80 const char *getBZeroEntry() const;
82 void overrideSchedPolicy(MachineSchedPolicy &Policy, MachineInstr *begin,
83 MachineInstr *end, unsigned NumRegionInstrs) const;
85 } // End llvm namespace
87 #endif // ARM64SUBTARGET_H