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_64 44 }; 45 } 46 47 class GlobalValue; 48 class TargetMachine; 49 50 class PPCSubtarget : public PPCGenSubtargetInfo { 51 protected: 52 /// stackAlignment - The minimum alignment known to hold of the stack frame on 53 /// entry to the function and which must be maintained by every function. 54 unsigned StackAlignment; 55 56 /// Selected instruction itineraries (one entry per itinerary class.) 57 InstrItineraryData InstrItins; 58 59 /// Which cpu directive was used. 60 unsigned DarwinDirective; 61 62 /// Used by the ISel to turn in optimizations for POWER4-derived architectures 63 bool IsGigaProcessor; 64 bool Has64BitSupport; 65 bool Use64BitRegs; 66 bool IsPPC64; 67 bool HasAltivec; 68 bool HasFSQRT; 69 bool HasSTFIWX; 70 bool IsBookE; 71 bool HasLazyResolverStubs; 72 bool IsJITCodeModel; 73 74 /// TargetTriple - What processor and OS we're targeting. 75 Triple TargetTriple; 76 77 public: 78 /// This constructor initializes the data members to match that 79 /// of the specified triple. 80 /// 81 PPCSubtarget(const std::string &TT, const std::string &CPU, 82 const std::string &FS, bool is64Bit); 83 84 /// ParseSubtargetFeatures - Parses features string setting specified 85 /// subtarget options. Definition of function is auto generated by tblgen. 86 void ParseSubtargetFeatures(StringRef CPU, StringRef FS); 87 88 /// SetJITMode - This is called to inform the subtarget info that we are 89 /// producing code for the JIT. 90 void SetJITMode(); 91 92 /// getStackAlignment - Returns the minimum alignment known to hold of the 93 /// stack frame on entry to the function and which must be maintained by every 94 /// function for this subtarget. 95 unsigned getStackAlignment() const { return StackAlignment; } 96 97 /// getDarwinDirective - Returns the -m directive specified for the cpu. 98 /// 99 unsigned getDarwinDirective() const { return DarwinDirective; } 100 101 /// getInstrItins - Return the instruction itineraies based on subtarget 102 /// selection. 103 const InstrItineraryData &getInstrItineraryData() const { return InstrItins; } 104 105 /// getTargetDataString - Return the pointer size and type alignment 106 /// properties of this subtarget. 107 const char *getTargetDataString() const { 108 // Note, the alignment values for f64 and i64 on ppc64 in Darwin 109 // documentation are wrong; these are correct (i.e. "what gcc does"). 110 return isPPC64() ? "E-p:64:64-f64:64:64-i64:64:64-f128:64:128-n32:64" 111 : "E-p:32:32-f64:64:64-i64:64:64-f128:64:128-n32"; 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, 131 const TargetMachine &TM) const; 132 133 // isJITCodeModel - True if we're generating code for the JIT 134 bool isJITCodeModel() const { return IsJITCodeModel; } 135 136 // Specific obvious features. 137 bool hasFSQRT() const { return HasFSQRT; } 138 bool hasSTFIWX() const { return HasSTFIWX; } 139 bool hasAltivec() const { return HasAltivec; } 140 bool isGigaProcessor() const { return IsGigaProcessor; } 141 bool isBookE() const { return IsBookE; } 142 143 const Triple &getTargetTriple() const { return TargetTriple; } 144 145 /// isDarwin - True if this is any darwin platform. 146 bool isDarwin() const { return TargetTriple.isMacOSX(); } 147 148 bool isDarwinABI() const { return isDarwin(); } 149 bool isSVR4ABI() const { return !isDarwin(); } 150 151 }; 152 } // End llvm namespace 153 154 #endif 155
