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_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_PWR6, 47 DIR_PWR7, 48 DIR_64 49 }; 50 } 51 52 class GlobalValue; 53 class TargetMachine; 54 55 class PPCSubtarget : public PPCGenSubtargetInfo { 56 protected: 57 /// stackAlignment - The minimum alignment known to hold of the stack frame on 58 /// entry to the function and which must be maintained by every function. 59 unsigned StackAlignment; 60 61 /// Selected instruction itineraries (one entry per itinerary class.) 62 InstrItineraryData InstrItins; 63 64 /// Which cpu directive was used. 65 unsigned DarwinDirective; 66 67 /// Used by the ISel to turn in optimizations for POWER4-derived architectures 68 bool HasMFOCRF; 69 bool Has64BitSupport; 70 bool Use64BitRegs; 71 bool IsPPC64; 72 bool HasAltivec; 73 bool HasFSQRT; 74 bool HasSTFIWX; 75 bool HasISEL; 76 bool IsBookE; 77 bool HasLazyResolverStubs; 78 bool IsJITCodeModel; 79 80 /// TargetTriple - What processor and OS we're targeting. 81 Triple TargetTriple; 82 83 public: 84 /// This constructor initializes the data members to match that 85 /// of the specified triple. 86 /// 87 PPCSubtarget(const std::string &TT, const std::string &CPU, 88 const std::string &FS, bool is64Bit); 89 90 /// ParseSubtargetFeatures - Parses features string setting specified 91 /// subtarget options. Definition of function is auto generated by tblgen. 92 void ParseSubtargetFeatures(StringRef CPU, StringRef FS); 93 94 /// SetJITMode - This is called to inform the subtarget info that we are 95 /// producing code for the JIT. 96 void SetJITMode(); 97 98 /// getStackAlignment - Returns the minimum alignment known to hold of the 99 /// stack frame on entry to the function and which must be maintained by every 100 /// function for this subtarget. 101 unsigned getStackAlignment() const { return StackAlignment; } 102 103 /// getDarwinDirective - Returns the -m directive specified for the cpu. 104 /// 105 unsigned getDarwinDirective() const { return DarwinDirective; } 106 107 /// getInstrItins - Return the instruction itineraies based on subtarget 108 /// selection. 109 const InstrItineraryData &getInstrItineraryData() const { return InstrItins; } 110 111 /// getTargetDataString - Return the pointer size and type alignment 112 /// properties of this subtarget. 113 const char *getTargetDataString() const { 114 // Note, the alignment values for f64 and i64 on ppc64 in Darwin 115 // documentation are wrong; these are correct (i.e. "what gcc does"). 116 return isPPC64() ? "E-p:64:64-f64:64:64-i64:64:64-f128:64:128-n32:64" 117 : "E-p:32:32-f64:64:64-i64:64:64-f128:64:128-n32"; 118 } 119 120 /// isPPC64 - Return true if we are generating code for 64-bit pointer mode. 121 /// 122 bool isPPC64() const { return IsPPC64; } 123 124 /// has64BitSupport - Return true if the selected CPU supports 64-bit 125 /// instructions, regardless of whether we are in 32-bit or 64-bit mode. 126 bool has64BitSupport() const { return Has64BitSupport; } 127 128 /// use64BitRegs - Return true if in 64-bit mode or if we should use 64-bit 129 /// registers in 32-bit mode when possible. This can only true if 130 /// has64BitSupport() returns true. 131 bool use64BitRegs() const { return Use64BitRegs; } 132 133 /// hasLazyResolverStub - Return true if accesses to the specified global have 134 /// to go through a dyld lazy resolution stub. This means that an extra load 135 /// is required to get the address of the global. 136 bool hasLazyResolverStub(const GlobalValue *GV, 137 const TargetMachine &TM) const; 138 139 // isJITCodeModel - True if we're generating code for the JIT 140 bool isJITCodeModel() const { return IsJITCodeModel; } 141 142 // Specific obvious features. 143 bool hasFSQRT() const { return HasFSQRT; } 144 bool hasSTFIWX() const { return HasSTFIWX; } 145 bool hasAltivec() const { return HasAltivec; } 146 bool hasMFOCRF() const { return HasMFOCRF; } 147 bool hasISEL() const { return HasISEL; } 148 bool isBookE() const { return IsBookE; } 149 150 const Triple &getTargetTriple() const { return TargetTriple; } 151 152 /// isDarwin - True if this is any darwin platform. 153 bool isDarwin() const { return TargetTriple.isMacOSX(); } 154 /// isBGP - True if this is a BG/P platform. 155 bool isBGP() const { return TargetTriple.getVendor() == Triple::BGP; } 156 157 bool isDarwinABI() const { return isDarwin(); } 158 bool isSVR4ABI() const { return !isDarwin(); } 159 160 /// enablePostRAScheduler - True at 'More' optimization. 161 bool enablePostRAScheduler(CodeGenOpt::Level OptLevel, 162 TargetSubtargetInfo::AntiDepBreakMode& Mode, 163 RegClassVector& CriticalPathRCs) const; 164 }; 165 } // End llvm namespace 166 167 #endif 168
