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 Module;
  43 class GlobalValue;
  44 class TargetMachine;
  45
  46 class PPCSubtarget : public TargetSubtarget {
  47 public:
  48   enum AsmWriterFlavorTy {
  49     OldMnemonic, NewMnemonic, Unset
  50   };
  51 protected:
  52   const TargetMachine &TM;
  53
  54   /// stackAlignment - The minimum alignment known to hold of the stack frame on
  55   /// entry to the function and which must be maintained by every function.
  56   unsigned StackAlignment;
  57
  58   /// Selected instruction itineraries (one entry per itinerary class.)
  59   InstrItineraryData InstrItins;
  60
  61   /// Which cpu directive was used.
  62   unsigned DarwinDirective;
  63
  64   /// AsmFlavor - Which PPC asm dialect to use.
  65   AsmWriterFlavorTy AsmFlavor;
  66
  67   /// Used by the ISel to turn in optimizations for POWER4-derived architectures
  68   bool IsGigaProcessor;
  69   bool Has64BitSupport;
  70   bool Use64BitRegs;
  71   bool IsPPC64;
  72   bool HasAltivec;
  73   bool HasFSQRT;
  74   bool HasSTFIWX;
  75   bool HasLazyResolverStubs;
  76
  77   /// DarwinVers - Nonzero if this is a darwin platform.  Otherwise, the numeric
  78   /// version of the platform, e.g. 8 = 10.4 (Tiger), 9 = 10.5 (Leopard), etc.
  79   unsigned char DarwinVers; // Is any darwin-ppc platform.
  80 public:
  81   /// This constructor initializes the data members to match that
  82   /// of the specified module.
  83   ///
  84   PPCSubtarget(const TargetMachine &TM, const Module &M,
  85                const std::string &FS, bool is64Bit);
  86
  87   /// ParseSubtargetFeatures - Parses features string setting specified
  88   /// subtarget options.  Definition of function is auto generated by tblgen.
  89   void ParseSubtargetFeatures(const std::string &FS, const std::string &CPU);
  90
  91   /// SetJITMode - This is called to inform the subtarget info that we are
  92   /// producing code for the JIT.
  93   void SetJITMode();
  94
  95   /// getStackAlignment - Returns the minimum alignment known to hold of the
  96   /// stack frame on entry to the function and which must be maintained by every
  97   /// function for this subtarget.
  98   unsigned getStackAlignment() const { return StackAlignment; }
  99
 100   /// getDarwinDirective - Returns the -m directive specified for the cpu.
 101   ///
 102   unsigned getDarwinDirective() const { return DarwinDirective; }
 103
 104   /// getInstrItins - Return the instruction itineraies based on subtarget
 105   /// selection.
 106   const InstrItineraryData &getInstrItineraryData() const { return InstrItins; }
 107
 108   /// getTargetDataString - Return the pointer size and type alignment
 109   /// properties of this subtarget.
 110   const char *getTargetDataString() const {
 111     // Note, the alignment values for f64 and i64 on ppc64 in Darwin
 112     // documentation are wrong; these are correct (i.e. "what gcc does").
 113     return isPPC64() ? "E-p:64:64-f64:64:64-i64:64:64-f128:64:128"
 114                      : "E-p:32:32-f64:32:64-i64:32:64-f128:64:128";
 115   }
 116
 117   /// isPPC64 - Return true if we are generating code for 64-bit pointer mode.
 118   ///
 119   bool isPPC64() const { return IsPPC64; }
 120
 121   /// has64BitSupport - Return true if the selected CPU supports 64-bit
 122   /// instructions, regardless of whether we are in 32-bit or 64-bit mode.
 123   bool has64BitSupport() const { return Has64BitSupport; }
 124
 125   /// use64BitRegs - Return true if in 64-bit mode or if we should use 64-bit
 126   /// registers in 32-bit mode when possible.  This can only true if
 127   /// has64BitSupport() returns true.
 128   bool use64BitRegs() const { return Use64BitRegs; }
 129
 130   /// hasLazyResolverStub - Return true if accesses to the specified global have
 131   /// to go through a dyld lazy resolution stub.  This means that an extra load
 132   /// is required to get the address of the global.
 133   bool hasLazyResolverStub(const GlobalValue *GV) const;
 134
 135   // Specific obvious features.
 136   bool hasFSQRT() const { return HasFSQRT; }
 137   bool hasSTFIWX() const { return HasSTFIWX; }
 138   bool hasAltivec() const { return HasAltivec; }
 139   bool isGigaProcessor() const { return IsGigaProcessor; }
 140
 141   /// isDarwin - True if this is any darwin platform.
 142   bool isDarwin() const { return DarwinVers != 0; }
 143   /// isDarwin - True if this is darwin9 (leopard, 10.5) or above.
 144   bool isDarwin9() const { return DarwinVers >= 9; }
 145
 146   /// getDarwinVers - Return the darwin version number, 8 = tiger, 9 = leopard.
 147   unsigned getDarwinVers() const { return DarwinVers; }
 148
 149   bool isMachoABI() const { return isDarwin() || IsPPC64; }
 150   bool isELF32_ABI() const { return !isDarwin() && !IsPPC64; }
 151
 152   unsigned getAsmFlavor() const {
 153     return AsmFlavor != Unset ? unsigned(AsmFlavor) : 0;
 154   }
 155 };
 156 } // End llvm namespace
 157
 158 #endif