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 152
