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_64 45 }; 46 } 47 48 class GlobalValue; 49 class TargetMachine; 50 51 class PPCSubtarget : public PPCGenSubtargetInfo { 52 protected: 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 /// Used by the ISel to turn in optimizations for POWER4-derived architectures 64 bool IsGigaProcessor; 65 bool Has64BitSupport; 66 bool Use64BitRegs; 67 bool IsPPC64; 68 bool HasAltivec; 69 bool HasFSQRT; 70 bool HasSTFIWX; 71 bool IsBookE; 72 bool HasLazyResolverStubs; 73 bool IsJITCodeModel; 74 75 /// TargetTriple - What processor and OS we're targeting. 76 Triple TargetTriple; 77 78 public: 79 /// This constructor initializes the data members to match that 80 /// of the specified triple. 81 /// 82 PPCSubtarget(const std::string &TT, const std::string &CPU, 83 const std::string &FS, bool is64Bit); 84 85 /// ParseSubtargetFeatures - Parses features string setting specified 86 /// subtarget options. Definition of function is auto generated by tblgen. 87 void ParseSubtargetFeatures(StringRef CPU, StringRef FS); 88 89 /// SetJITMode - This is called to inform the subtarget info that we are 90 /// producing code for the JIT. 91 void SetJITMode(); 92 93 /// getStackAlignment - Returns the minimum alignment known to hold of the 94 /// stack frame on entry to the function and which must be maintained by every 95 /// function for this subtarget. 96 unsigned getStackAlignment() const { return StackAlignment; } 97 98 /// getDarwinDirective - Returns the -m directive specified for the cpu. 99 /// 100 unsigned getDarwinDirective() const { return DarwinDirective; } 101 102 /// getInstrItins - Return the instruction itineraies based on subtarget 103 /// selection. 104 const InstrItineraryData &getInstrItineraryData() const { return InstrItins; } 105 106 /// getTargetDataString - Return the pointer size and type alignment 107 /// properties of this subtarget. 108 const char *getTargetDataString() const { 109 // Note, the alignment values for f64 and i64 on ppc64 in Darwin 110 // documentation are wrong; these are correct (i.e. "what gcc does"). 111 return isPPC64() ? "E-p:64:64-f64:64:64-i64:64:64-f128:64:128-n32:64" 112 : "E-p:32:32-f64:64:64-i64:64:64-f128:64:128-n32"; 113 } 114 115 /// isPPC64 - Return true if we are generating code for 64-bit pointer mode. 116 /// 117 bool isPPC64() const { return IsPPC64; } 118 119 /// has64BitSupport - Return true if the selected CPU supports 64-bit 120 /// instructions, regardless of whether we are in 32-bit or 64-bit mode. 121 bool has64BitSupport() const { return Has64BitSupport; } 122 123 /// use64BitRegs - Return true if in 64-bit mode or if we should use 64-bit 124 /// registers in 32-bit mode when possible. This can only true if 125 /// has64BitSupport() returns true. 126 bool use64BitRegs() const { return Use64BitRegs; } 127 128 /// hasLazyResolverStub - Return true if accesses to the specified global have 129 /// to go through a dyld lazy resolution stub. This means that an extra load 130 /// is required to get the address of the global. 131 bool hasLazyResolverStub(const GlobalValue *GV, 132 const TargetMachine &TM) const; 133 134 // isJITCodeModel - True if we're generating code for the JIT 135 bool isJITCodeModel() const { return IsJITCodeModel; } 136 137 // Specific obvious features. 138 bool hasFSQRT() const { return HasFSQRT; } 139 bool hasSTFIWX() const { return HasSTFIWX; } 140 bool hasAltivec() const { return HasAltivec; } 141 bool isGigaProcessor() const { return IsGigaProcessor; } 142 bool isBookE() const { return IsBookE; } 143 144 const Triple &getTargetTriple() const { return TargetTriple; } 145 146 /// isDarwin - True if this is any darwin platform. 147 bool isDarwin() const { return TargetTriple.isMacOSX(); } 148 /// isBGP - True if this is a BG/P platform. 149 bool isBGP() const { return TargetTriple.getVendor() == Triple::BGP; } 150 151 bool isDarwinABI() const { return isDarwin(); } 152 bool isSVR4ABI() const { return !isDarwin(); } 153 154 /// enablePostRAScheduler - True at 'More' optimization. 155 bool enablePostRAScheduler(CodeGenOpt::Level OptLevel, 156 TargetSubtargetInfo::AntiDepBreakMode& Mode, 157 RegClassVector& CriticalPathRCs) const; 158 }; 159 } // End llvm namespace 160 161 #endif 162
