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 TargetSubtarget.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef POWERPCSUBTARGET_H
  15 #define POWERPCSUBTARGET_H
  16
  17 #include "llvm/Target/TargetInstrItineraries.h"
  18 #include "llvm/Target/TargetSubtarget.h"
  19
  20 #include <string>
  21
  22 // GCC #defines PPC on Linux but we use it as our namespace name
  23 #undef PPC
  24
  25 namespace llvm {
  26
  27 namespace PPC {
  28   // -m directive values.
  29   enum {
  30     DIR_NONE,
  31     DIR_32,
  32     DIR_601,
  33     DIR_602,
  34     DIR_603,
  35     DIR_7400,
  36     DIR_750,
  37     DIR_970,
  38     DIR_64
  39   };
  40 }
  41
  42 class GlobalValue;
  43 class TargetMachine;
  44
  45 class PPCSubtarget : public TargetSubtarget {
  46 protected:
  47   /// stackAlignment - The minimum alignment known to hold of the stack frame on
  48   /// entry to the function and which must be maintained by every function.
  49   unsigned StackAlignment;
  50
  51   /// Selected instruction itineraries (one entry per itinerary class.)
  52   InstrItineraryData InstrItins;
  53
  54   /// Which cpu directive was used.
  55   unsigned DarwinDirective;
  56
  57   /// Used by the ISel to turn in optimizations for POWER4-derived architectures
  58   bool IsGigaProcessor;
  59   bool Has64BitSupport;
  60   bool Use64BitRegs;
  61   bool IsPPC64;
  62   bool HasAltivec;
  63   bool HasFSQRT;
  64   bool HasSTFIWX;
  65   bool HasLazyResolverStubs;
  66
  67   /// DarwinVers - Nonzero if this is a darwin platform.  Otherwise, the numeric
  68   /// version of the platform, e.g. 8 = 10.4 (Tiger), 9 = 10.5 (Leopard), etc.
  69   unsigned char DarwinVers; // Is any darwin-ppc platform.
  70 public:
  71   /// This constructor initializes the data members to match that
  72   /// of the specified triple.
  73   ///
  74   PPCSubtarget(const std::string &TT, const std::string &FS, bool is64Bit);
  75
  76   /// ParseSubtargetFeatures - Parses features string setting specified
  77   /// subtarget options.  Definition of function is auto generated by tblgen.
  78   std::string ParseSubtargetFeatures(const std::string &FS,
  79                                      const std::string &CPU);
  80
  81
  82   /// SetJITMode - This is called to inform the subtarget info that we are
  83   /// producing code for the JIT.
  84   void SetJITMode();
  85
  86   /// getStackAlignment - Returns the minimum alignment known to hold of the
  87   /// stack frame on entry to the function and which must be maintained by every
  88   /// function for this subtarget.
  89   unsigned getStackAlignment() const { return StackAlignment; }
  90
  91   /// getDarwinDirective - Returns the -m directive specified for the cpu.
  92   ///
  93   unsigned getDarwinDirective() const { return DarwinDirective; }
  94
  95   /// getInstrItins - Return the instruction itineraies based on subtarget
  96   /// selection.
  97   const InstrItineraryData &getInstrItineraryData() const { return InstrItins; }
  98
  99   /// getTargetDataString - Return the pointer size and type alignment
 100   /// properties of this subtarget.
 101   const char *getTargetDataString() const {
 102     // Note, the alignment values for f64 and i64 on ppc64 in Darwin
 103     // documentation are wrong; these are correct (i.e. "what gcc does").
 104     return isPPC64() ? "E-p:64:64-f64:64:64-i64:64:64-f128:64:128"
 105                      : "E-p:32:32-f64:32:64-i64:32:64-f128:64:128";
 106   }
 107
 108   /// isPPC64 - Return true if we are generating code for 64-bit pointer mode.
 109   ///
 110   bool isPPC64() const { return IsPPC64; }
 111
 112   /// has64BitSupport - Return true if the selected CPU supports 64-bit
 113   /// instructions, regardless of whether we are in 32-bit or 64-bit mode.
 114   bool has64BitSupport() const { return Has64BitSupport; }
 115
 116   /// use64BitRegs - Return true if in 64-bit mode or if we should use 64-bit
 117   /// registers in 32-bit mode when possible.  This can only true if
 118   /// has64BitSupport() returns true.
 119   bool use64BitRegs() const { return Use64BitRegs; }
 120
 121   /// hasLazyResolverStub - Return true if accesses to the specified global have
 122   /// to go through a dyld lazy resolution stub.  This means that an extra load
 123   /// is required to get the address of the global.
 124   bool hasLazyResolverStub(const GlobalValue *GV,
 125                            const TargetMachine &TM) const;
 126
 127   // Specific obvious features.
 128   bool hasFSQRT() const { return HasFSQRT; }
 129   bool hasSTFIWX() const { return HasSTFIWX; }
 130   bool hasAltivec() const { return HasAltivec; }
 131   bool isGigaProcessor() const { return IsGigaProcessor; }
 132
 133   /// isDarwin - True if this is any darwin platform.
 134   bool isDarwin() const { return DarwinVers != 0; }
 135   /// isDarwin - True if this is darwin9 (leopard, 10.5) or above.
 136   bool isDarwin9() const { return DarwinVers >= 9; }
 137
 138   /// getDarwinVers - Return the darwin version number, 8 = tiger, 9 = leopard.
 139   unsigned getDarwinVers() const { return DarwinVers; }
 140
 141   bool isDarwinABI() const { return isDarwin(); }
 142   bool isSVR4ABI() const { return !isDarwin(); }
 143
 144 };
 145 } // End llvm namespace
 146
 147 #endif