lib/Target/ARM/ARMSubtarget.h

   1 //=====---- ARMSubtarget.h - Define Subtarget for the ARM -----*- 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 ARM specific subclass of TargetSubtarget.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef ARMSUBTARGET_H
  15 #define ARMSUBTARGET_H
  16
  17 #include "llvm/Target/TargetInstrItineraries.h"
  18 #include "llvm/Target/TargetMachine.h"
  19 #include "llvm/Target/TargetSubtarget.h"
  20 #include <string>
  21
  22 namespace llvm {
  23 class GlobalValue;
  24
  25 class ARMSubtarget : public TargetSubtarget {
  26 protected:
  27   enum ARMArchEnum {
  28     V4T, V5T, V5TE, V6, V6T2, V7A
  29   };
  30
  31   enum ARMFPEnum {
  32     None, VFPv2, VFPv3, NEON
  33   };
  34
  35   enum ThumbTypeEnum {
  36     Thumb1,
  37     Thumb2
  38   };
  39
  40   /// ARMArchVersion - ARM architecture version: V4T (base), V5T, V5TE,
  41   /// V6, V6T2, V7A.
  42   ARMArchEnum ARMArchVersion;
  43
  44   /// ARMFPUType - Floating Point Unit type.
  45   ARMFPEnum ARMFPUType;
  46
  47   /// UseNEONForSinglePrecisionFP - if the NEONFP attribute has been
  48   /// specified. Use the method useNEONForSinglePrecisionFP() to
  49   /// determine if NEON should actually be used.
  50   bool UseNEONForSinglePrecisionFP;
  51
  52   /// IsThumb - True if we are in thumb mode, false if in ARM mode.
  53   bool IsThumb;
  54
  55   /// ThumbMode - Indicates supported Thumb version.
  56   ThumbTypeEnum ThumbMode;
  57
  58   /// IsR9Reserved - True if R9 is a not available as general purpose register.
  59   bool IsR9Reserved;
  60
  61   /// stackAlignment - The minimum alignment known to hold of the stack frame on
  62   /// entry to the function and which must be maintained by every function.
  63   unsigned stackAlignment;
  64
  65   /// CPUString - String name of used CPU.
  66   std::string CPUString;
  67
  68   /// Selected instruction itineraries (one entry per itinerary class.)
  69   InstrItineraryData InstrItins;
  70
  71  public:
  72   enum {
  73     isELF, isDarwin
  74   } TargetType;
  75
  76   enum {
  77     ARM_ABI_APCS,
  78     ARM_ABI_AAPCS // ARM EABI
  79   } TargetABI;
  80
  81   /// This constructor initializes the data members to match that
  82   /// of the specified triple.
  83   ///
  84   ARMSubtarget(const std::string &TT, const std::string &FS, bool isThumb);
  85
  86   /// getMaxInlineSizeThreshold - Returns the maximum memset / memcpy size
  87   /// that still makes it profitable to inline the call.
  88   unsigned getMaxInlineSizeThreshold() const {
  89     // FIXME: For now, we don't lower memcpy's to loads / stores for Thumb.
  90     // Change this once Thumb ldmia / stmia support is added.
  91     return isThumb() ? 0 : 64;
  92   }
  93   /// ParseSubtargetFeatures - Parses features string setting specified
  94   /// subtarget options.  Definition of function is auto generated by tblgen.
  95   std::string ParseSubtargetFeatures(const std::string &FS,
  96                                      const std::string &CPU);
  97
  98   bool hasV4TOps()  const { return ARMArchVersion >= V4T;  }
  99   bool hasV5TOps()  const { return ARMArchVersion >= V5T;  }
 100   bool hasV5TEOps() const { return ARMArchVersion >= V5TE; }
 101   bool hasV6Ops()   const { return ARMArchVersion >= V6;   }
 102   bool hasV6T2Ops() const { return ARMArchVersion >= V6T2; }
 103   bool hasV7Ops()   const { return ARMArchVersion >= V7A;  }
 104
 105   bool hasVFP2() const { return ARMFPUType >= VFPv2; }
 106   bool hasVFP3() const { return ARMFPUType >= VFPv3; }
 107   bool hasNEON() const { return ARMFPUType >= NEON;  }
 108   bool useNEONForSinglePrecisionFP() const {
 109     return hasNEON() && UseNEONForSinglePrecisionFP; }
 110
 111   bool isTargetDarwin() const { return TargetType == isDarwin; }
 112   bool isTargetELF() const { return TargetType == isELF; }
 113
 114   bool isAPCS_ABI() const { return TargetABI == ARM_ABI_APCS; }
 115   bool isAAPCS_ABI() const { return TargetABI == ARM_ABI_AAPCS; }
 116
 117   bool isThumb() const { return IsThumb; }
 118   bool isThumb1Only() const { return IsThumb && (ThumbMode == Thumb1); }
 119   bool isThumb2() const { return IsThumb && (ThumbMode == Thumb2); }
 120   bool hasThumb2() const { return ThumbMode >= Thumb2; }
 121
 122   bool isR9Reserved() const { return IsR9Reserved; }
 123
 124   const std::string & getCPUString() const { return CPUString; }
 125
 126   /// getInstrItins - Return the instruction itineraies based on subtarget
 127   /// selection.
 128   const InstrItineraryData &getInstrItineraryData() const { return InstrItins; }
 129
 130   /// getStackAlignment - Returns the minimum alignment known to hold of the
 131   /// stack frame on entry to the function and which must be maintained by every
 132   /// function for this subtarget.
 133   unsigned getStackAlignment() const { return stackAlignment; }
 134
 135   /// GVIsIndirectSymbol - true if the GV will be accessed via an indirect
 136   /// symbol.
 137   bool GVIsIndirectSymbol(GlobalValue *GV, Reloc::Model RelocM) const;
 138 };
 139 } // End llvm namespace
 140
 141 #endif  // ARMSUBTARGET_H