src/llvm/lib/Target/PowerPC/PPCSubtarget.h

   1 //===-- PPCSubtarget.h - Define Subtarget for the PPC ----------*- 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 PowerPC specific subclass of TargetSubtargetInfo.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef POWERPCSUBTARGET_H
  15 #define POWERPCSUBTARGET_H
  16
  17 #include "llvm/ADT/Triple.h"
  18 #include "llvm/MC/MCInstrItineraries.h"
  19 #include "llvm/Target/TargetSubtargetInfo.h"
  20 #include <string>
  21
  22 #define GET_SUBTARGETINFO_HEADER
  23 #include "PPCGenSubtargetInfo.inc"
  24
  25 // GCC #defines PPC on Linux but we use it as our namespace name
  26 #undef PPC
  27
  28 namespace llvm {
  29 class StringRef;
  30
  31 namespace PPC {
  32   // -m directive values.
  33   enum {
  34     DIR_NONE,
  35     DIR_32,
  36     DIR_440,
  37     DIR_601,
  38     DIR_602,
  39     DIR_603,
  40     DIR_7400,
  41     DIR_750,
  42     DIR_970,
  43     DIR_A2,
  44     DIR_E500mc,
  45     DIR_E5500,
  46     DIR_PWR3,
  47     DIR_PWR4,
  48     DIR_PWR5,
  49     DIR_PWR5X,
  50     DIR_PWR6,
  51     DIR_PWR6X,
  52     DIR_PWR7,
  53     DIR_64
  54   };
  55 }
  56
  57 class GlobalValue;
  58 class TargetMachine;
  59
  60 class PPCSubtarget : public PPCGenSubtargetInfo {
  61 protected:
  62   /// stackAlignment - The minimum alignment known to hold of the stack frame on
  63   /// entry to the function and which must be maintained by every function.
  64   unsigned StackAlignment;
  65
  66   /// Selected instruction itineraries (one entry per itinerary class.)
  67   InstrItineraryData InstrItins;
  68
  69   /// Which cpu directive was used.
  70   unsigned DarwinDirective;
  71
  72   /// Used by the ISel to turn in optimizations for POWER4-derived architectures
  73   bool HasMFOCRF;
  74   bool Has64BitSupport;
  75   bool Use64BitRegs;
  76   bool IsPPC64;
  77   bool HasAltivec;
  78   bool HasQPX;
  79   bool HasFSQRT;
  80   bool HasSTFIWX;
  81   bool HasISEL;
  82   bool IsBookE;
  83   bool HasLazyResolverStubs;
  84   bool IsJITCodeModel;
  85
  86   /// TargetTriple - What processor and OS we're targeting.
  87   Triple TargetTriple;
  88
  89 public:
  90   /// This constructor initializes the data members to match that
  91   /// of the specified triple.
  92   ///
  93   PPCSubtarget(const std::string &TT, const std::string &CPU,
  94                const std::string &FS, bool is64Bit);
  95
  96   /// ParseSubtargetFeatures - Parses features string setting specified
  97   /// subtarget options.  Definition of function is auto generated by tblgen.
  98   void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
  99
 100   /// SetJITMode - This is called to inform the subtarget info that we are
 101   /// producing code for the JIT.
 102   void SetJITMode();
 103
 104   /// getStackAlignment - Returns the minimum alignment known to hold of the
 105   /// stack frame on entry to the function and which must be maintained by every
 106   /// function for this subtarget.
 107   unsigned getStackAlignment() const { return StackAlignment; }
 108
 109   /// getDarwinDirective - Returns the -m directive specified for the cpu.
 110   ///
 111   unsigned getDarwinDirective() const { return DarwinDirective; }
 112
 113   /// getInstrItins - Return the instruction itineraies based on subtarget
 114   /// selection.
 115   const InstrItineraryData &getInstrItineraryData() const { return InstrItins; }
 116
 117   /// getDataLayoutString - Return the pointer size and type alignment
 118   /// properties of this subtarget.
 119   const char *getDataLayoutString() const {
 120     // Note, the alignment values for f64 and i64 on ppc64 in Darwin
 121     // documentation are wrong; these are correct (i.e. "what gcc does").
 122     if (isPPC64() && isSVR4ABI()) {
 123       if (TargetTriple.getOS() == llvm::Triple::FreeBSD)
 124         return "E-p:64:64-f64:64:64-i64:64:64-f128:64:64-v128:128:128-n32:64";
 125       else
 126         return "E-p:64:64-f64:64:64-i64:64:64-f128:128:128-v128:128:128-n32:64";
 127     }
 128
 129     return isPPC64() ? "E-p:64:64-f64:64:64-i64:64:64-f128:64:128-n32:64"
 130                      : "E-p:32:32-f64:64:64-i64:64:64-f128:64:128-n32";
 131   }
 132
 133   /// isPPC64 - Return true if we are generating code for 64-bit pointer mode.
 134   ///
 135   bool isPPC64() const { return IsPPC64; }
 136
 137   /// has64BitSupport - Return true if the selected CPU supports 64-bit
 138   /// instructions, regardless of whether we are in 32-bit or 64-bit mode.
 139   bool has64BitSupport() const { return Has64BitSupport; }
 140
 141   /// use64BitRegs - Return true if in 64-bit mode or if we should use 64-bit
 142   /// registers in 32-bit mode when possible.  This can only true if
 143   /// has64BitSupport() returns true.
 144   bool use64BitRegs() const { return Use64BitRegs; }
 145
 146   /// hasLazyResolverStub - Return true if accesses to the specified global have
 147   /// to go through a dyld lazy resolution stub.  This means that an extra load
 148   /// is required to get the address of the global.
 149   bool hasLazyResolverStub(const GlobalValue *GV,
 150                            const TargetMachine &TM) const;
 151
 152   // isJITCodeModel - True if we're generating code for the JIT
 153   bool isJITCodeModel() const { return IsJITCodeModel; }
 154
 155   // Specific obvious features.
 156   bool hasFSQRT() const { return HasFSQRT; }
 157   bool hasSTFIWX() const { return HasSTFIWX; }
 158   bool hasAltivec() const { return HasAltivec; }
 159   bool hasQPX() const { return HasQPX; }
 160   bool hasMFOCRF() const { return HasMFOCRF; }
 161   bool hasISEL() const { return HasISEL; }
 162   bool isBookE() const { return IsBookE; }
 163
 164   const Triple &getTargetTriple() const { return TargetTriple; }
 165
 166   /// isDarwin - True if this is any darwin platform.
 167   bool isDarwin() const { return TargetTriple.isMacOSX(); }
 168   /// isBGP - True if this is a BG/P platform.
 169   bool isBGP() const { return TargetTriple.getVendor() == Triple::BGP; }
 170   /// isBGQ - True if this is a BG/Q platform.
 171   bool isBGQ() const { return TargetTriple.getVendor() == Triple::BGQ; }
 172
 173   bool isDarwinABI() const { return isDarwin(); }
 174   bool isSVR4ABI() const { return !isDarwin(); }
 175
 176   /// enablePostRAScheduler - True at 'More' optimization.
 177   bool enablePostRAScheduler(CodeGenOpt::Level OptLevel,
 178                              TargetSubtargetInfo::AntiDepBreakMode& Mode,
 179                              RegClassVector& CriticalPathRCs) const;
 180 };
 181 } // End llvm namespace
 182
 183 #endif