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/Target/TargetSubtargetInfo.h"
  18 #include "llvm/MC/MCInstrItineraries.h"
  19 #include "llvm/ADT/Triple.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_601,
  37     DIR_602,
  38     DIR_603,
  39     DIR_7400,
  40     DIR_750,
  41     DIR_970,
  42     DIR_64
  43   };
  44 }
  45
  46 class GlobalValue;
  47 class TargetMachine;
  48
  49 class PPCSubtarget : public PPCGenSubtargetInfo {
  50 protected:
  51   /// stackAlignment - The minimum alignment known to hold of the stack frame on
  52   /// entry to the function and which must be maintained by every function.
  53   unsigned StackAlignment;
  54
  55   /// Selected instruction itineraries (one entry per itinerary class.)
  56   InstrItineraryData InstrItins;
  57
  58   /// Which cpu directive was used.
  59   unsigned DarwinDirective;
  60
  61   /// Used by the ISel to turn in optimizations for POWER4-derived architectures
  62   bool IsGigaProcessor;
  63   bool Has64BitSupport;
  64   bool Use64BitRegs;
  65   bool IsPPC64;
  66   bool HasAltivec;
  67   bool HasFSQRT;
  68   bool HasSTFIWX;
  69   bool HasLazyResolverStubs;
  70   bool IsJITCodeModel;
  71
  72   /// TargetTriple - What processor and OS we're targeting.
  73   Triple TargetTriple;
  74
  75 public:
  76   /// This constructor initializes the data members to match that
  77   /// of the specified triple.
  78   ///
  79   PPCSubtarget(const std::string &TT, const std::string &CPU,
  80                const std::string &FS, bool is64Bit);
  81
  82   /// ParseSubtargetFeatures - Parses features string setting specified
  83   /// subtarget options.  Definition of function is auto generated by tblgen.
  84   void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
  85
  86   /// SetJITMode - This is called to inform the subtarget info that we are
  87   /// producing code for the JIT.
  88   void SetJITMode();
  89
  90   /// getStackAlignment - Returns the minimum alignment known to hold of the
  91   /// stack frame on entry to the function and which must be maintained by every
  92   /// function for this subtarget.
  93   unsigned getStackAlignment() const { return StackAlignment; }
  94
  95   /// getDarwinDirective - Returns the -m directive specified for the cpu.
  96   ///
  97   unsigned getDarwinDirective() const { return DarwinDirective; }
  98
  99   /// getInstrItins - Return the instruction itineraies based on subtarget
 100   /// selection.
 101   const InstrItineraryData &getInstrItineraryData() const { return InstrItins; }
 102
 103   /// getTargetDataString - Return the pointer size and type alignment
 104   /// properties of this subtarget.
 105   const char *getTargetDataString() const {
 106     // Note, the alignment values for f64 and i64 on ppc64 in Darwin
 107     // documentation are wrong; these are correct (i.e. "what gcc does").
 108     return isPPC64() ? "E-p:64:64-f64:64:64-i64:64:64-f128:64:128-n32:64"
 109                      : "E-p:32:32-f64:64:64-i64:64:64-f128:64:128-n32";
 110   }
 111
 112   /// isPPC64 - Return true if we are generating code for 64-bit pointer mode.
 113   ///
 114   bool isPPC64() const { return IsPPC64; }
 115
 116   /// has64BitSupport - Return true if the selected CPU supports 64-bit
 117   /// instructions, regardless of whether we are in 32-bit or 64-bit mode.
 118   bool has64BitSupport() const { return Has64BitSupport; }
 119
 120   /// use64BitRegs - Return true if in 64-bit mode or if we should use 64-bit
 121   /// registers in 32-bit mode when possible.  This can only true if
 122   /// has64BitSupport() returns true.
 123   bool use64BitRegs() const { return Use64BitRegs; }
 124
 125   /// hasLazyResolverStub - Return true if accesses to the specified global have
 126   /// to go through a dyld lazy resolution stub.  This means that an extra load
 127   /// is required to get the address of the global.
 128   bool hasLazyResolverStub(const GlobalValue *GV,
 129                            const TargetMachine &TM) const;
 130
 131   // isJITCodeModel - True if we're generating code for the JIT
 132   bool isJITCodeModel() const { return IsJITCodeModel; }
 133
 134   // Specific obvious features.
 135   bool hasFSQRT() const { return HasFSQRT; }
 136   bool hasSTFIWX() const { return HasSTFIWX; }
 137   bool hasAltivec() const { return HasAltivec; }
 138   bool isGigaProcessor() const { return IsGigaProcessor; }
 139
 140   const Triple &getTargetTriple() const { return TargetTriple; }
 141
 142   /// isDarwin - True if this is any darwin platform.
 143   bool isDarwin() const { return TargetTriple.isMacOSX(); }
 144
 145   bool isDarwinABI() const { return isDarwin(); }
 146   bool isSVR4ABI() const { return !isDarwin(); }
 147
 148 };
 149 } // End llvm namespace
 150
 151 #endif