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_32,
  31     DIR_601,
  32     DIR_602,
  33     DIR_603,
  34     DIR_7400,
  35     DIR_750,
  36     DIR_970,
  37     DIR_64
  38   };
  39 }
  40
  41 class Module;
  42 class GlobalValue;
  43 class TargetMachine;
  44
  45 class PPCSubtarget : public TargetSubtarget {
  46 public:
  47   enum AsmWriterFlavorTy {
  48     OldMnemonic, NewMnemonic, Unset
  49   };
  50 protected:
  51   const TargetMachine &TM;
  52
  53   /// stackAlignment - The minimum alignment known to hold of the stack frame on
  54   /// entry to the function and which must be maintained by every function.
  55   unsigned StackAlignment;
  56
  57   /// Selected instruction itineraries (one entry per itinerary class.)
  58   InstrItineraryData InstrItins;
  59
  60   /// Which cpu directive was used.
  61   unsigned DarwinDirective;
  62
  63   /// AsmFlavor - Which PPC asm dialect to use.
  64   AsmWriterFlavorTy AsmFlavor;
  65
  66   /// Used by the ISel to turn in optimizations for POWER4-derived architectures
  67   bool IsGigaProcessor;
  68   bool Has64BitSupport;
  69   bool Use64BitRegs;
  70   bool IsPPC64;
  71   bool HasAltivec;
  72   bool HasFSQRT;
  73   bool HasSTFIWX;
  74   bool HasLazyResolverStubs;
  75
  76   /// DarwinVers - Nonzero if this is a darwin platform.  Otherwise, the numeric
  77   /// version of the platform, e.g. 8 = 10.4 (Tiger), 9 = 10.5 (Leopard), etc.
  78   unsigned char DarwinVers; // Is any darwin-ppc platform.
  79 public:
  80   /// This constructor initializes the data members to match that
  81   /// of the specified module.
  82   ///
  83   PPCSubtarget(const TargetMachine &TM, const Module &M,
  84                const std::string &FS, bool is64Bit);
  85
  86   /// ParseSubtargetFeatures - Parses features string setting specified
  87   /// subtarget options.  Definition of function is auto generated by tblgen.
  88   void ParseSubtargetFeatures(const std::string &FS, const std::string &CPU);
  89
  90   /// SetJITMode - This is called to inform the subtarget info that we are
  91   /// producing code for the JIT.
  92   void SetJITMode();
  93
  94   /// getStackAlignment - Returns the minimum alignment known to hold of the
  95   /// stack frame on entry to the function and which must be maintained by every
  96   /// function for this subtarget.
  97   unsigned getStackAlignment() const { return StackAlignment; }
  98
  99   /// getDarwinDirective - Returns the -m directive specified for the cpu.
 100   ///
 101   unsigned getDarwinDirective() const { return DarwinDirective; }
 102
 103   /// getInstrItins - Return the instruction itineraies based on subtarget
 104   /// selection.
 105   const InstrItineraryData &getInstrItineraryData() const { return InstrItins; }
 106
 107   /// getTargetDataString - Return the pointer size and type alignment
 108   /// properties of this subtarget.
 109   const char *getTargetDataString() const {
 110     return isPPC64() ? "E-p:64:64-f64:32:64-i64:32:64-f128:64:128"
 111                      : "E-p:32:32-f64:32:64-i64:32:64-f128:64:128";
 112   }
 113
 114   /// isPPC64 - Return true if we are generating code for 64-bit pointer mode.
 115   ///
 116   bool isPPC64() const { return IsPPC64; }
 117
 118   /// has64BitSupport - Return true if the selected CPU supports 64-bit
 119   /// instructions, regardless of whether we are in 32-bit or 64-bit mode.
 120   bool has64BitSupport() const { return Has64BitSupport; }
 121
 122   /// use64BitRegs - Return true if in 64-bit mode or if we should use 64-bit
 123   /// registers in 32-bit mode when possible.  This can only true if
 124   /// has64BitSupport() returns true.
 125   bool use64BitRegs() const { return Use64BitRegs; }
 126
 127   /// hasLazyResolverStub - Return true if accesses to the specified global have
 128   /// to go through a dyld lazy resolution stub.  This means that an extra load
 129   /// is required to get the address of the global.
 130   bool hasLazyResolverStub(const GlobalValue *GV) const;
 131
 132   // Specific obvious features.
 133   bool hasFSQRT() const { return HasFSQRT; }
 134   bool hasSTFIWX() const { return HasSTFIWX; }
 135   bool hasAltivec() const { return HasAltivec; }
 136   bool isGigaProcessor() const { return IsGigaProcessor; }
 137
 138   /// isDarwin - True if this is any darwin platform.
 139   bool isDarwin() const { return DarwinVers != 0; }
 140   /// isDarwin - True if this is darwin9 (leopard, 10.5) or above.
 141   bool isDarwin9() const { return DarwinVers >= 9; }
 142
 143   bool isMachoABI() const { return isDarwin() || IsPPC64; }
 144   bool isELF32_ABI() const { return !isDarwin() && !IsPPC64; }
 145
 146   unsigned getAsmFlavor() const {
 147     return AsmFlavor != Unset ? unsigned(AsmFlavor) : 0;
 148   }
 149 };
 150 } // End llvm namespace
 151
 152 #endif