1 //===-- PPCSubtarget.h - Define Subtarget for the PPC ----------*- C++ -*--===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file declares the PowerPC specific subclass of TargetSubtargetInfo.
12 //===----------------------------------------------------------------------===//
14 #ifndef POWERPCSUBTARGET_H
15 #define POWERPCSUBTARGET_H
17 #include "llvm/ADT/Triple.h"
18 #include "llvm/MC/MCInstrItineraries.h"
19 #include "llvm/Target/TargetSubtargetInfo.h"
22 #define GET_SUBTARGETINFO_HEADER
23 #include "PPCGenSubtargetInfo.inc"
25 // GCC #defines PPC on Linux but we use it as our namespace name
32 // -m directive values.
60 class PPCSubtarget : public PPCGenSubtargetInfo {
62 /// stackAlignment - The minimum alignment known to hold of the stack frame on
63 /// entry to the function and which must be maintained by every function.
64 unsigned StackAlignment;
66 /// Selected instruction itineraries (one entry per itinerary class.)
67 InstrItineraryData InstrItins;
69 /// Which cpu directive was used.
70 unsigned DarwinDirective;
72 /// Used by the ISel to turn in optimizations for POWER4-derived architectures
80 bool HasFRE, HasFRES, HasFRSQRTE, HasFRSQRTES;
90 bool HasLazyResolverStubs;
94 /// TargetTriple - What processor and OS we're targeting.
98 /// This constructor initializes the data members to match that
99 /// of the specified triple.
101 PPCSubtarget(const std::string &TT, const std::string &CPU,
102 const std::string &FS, bool is64Bit);
104 /// ParseSubtargetFeatures - Parses features string setting specified
105 /// subtarget options. Definition of function is auto generated by tblgen.
106 void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
108 /// SetJITMode - This is called to inform the subtarget info that we are
109 /// producing code for the JIT.
112 /// getStackAlignment - Returns the minimum alignment known to hold of the
113 /// stack frame on entry to the function and which must be maintained by every
114 /// function for this subtarget.
115 unsigned getStackAlignment() const { return StackAlignment; }
117 /// getDarwinDirective - Returns the -m directive specified for the cpu.
119 unsigned getDarwinDirective() const { return DarwinDirective; }
121 /// getInstrItins - Return the instruction itineraies based on subtarget
123 const InstrItineraryData &getInstrItineraryData() const { return InstrItins; }
125 /// getDataLayoutString - Return the pointer size and type alignment
126 /// properties of this subtarget.
127 const char *getDataLayoutString() const {
128 // Note, the alignment values for f64 and i64 on ppc64 in Darwin
129 // documentation are wrong; these are correct (i.e. "what gcc does").
130 if (isPPC64() && isSVR4ABI()) {
131 if (TargetTriple.getOS() == llvm::Triple::FreeBSD)
132 return "E-p:64:64-f64:64:64-i64:64:64-v128:128:128-n32:64";
134 return "E-p:64:64-f64:64:64-i64:64:64-f128:128:128-v128:128:128-n32:64";
137 return isPPC64() ? "E-p:64:64-f64:64:64-i64:64:64-f128:64:128-n32:64"
138 : "E-p:32:32-f64:64:64-i64:64:64-f128:64:128-n32";
141 /// \brief Reset the features for the PowerPC target.
142 virtual void resetSubtargetFeatures(const MachineFunction *MF);
144 void initializeEnvironment();
145 void resetSubtargetFeatures(StringRef CPU, StringRef FS);
148 /// isPPC64 - Return true if we are generating code for 64-bit pointer mode.
150 bool isPPC64() const { return IsPPC64; }
152 /// has64BitSupport - Return true if the selected CPU supports 64-bit
153 /// instructions, regardless of whether we are in 32-bit or 64-bit mode.
154 bool has64BitSupport() const { return Has64BitSupport; }
156 /// use64BitRegs - Return true if in 64-bit mode or if we should use 64-bit
157 /// registers in 32-bit mode when possible. This can only true if
158 /// has64BitSupport() returns true.
159 bool use64BitRegs() const { return Use64BitRegs; }
161 /// hasLazyResolverStub - Return true if accesses to the specified global have
162 /// to go through a dyld lazy resolution stub. This means that an extra load
163 /// is required to get the address of the global.
164 bool hasLazyResolverStub(const GlobalValue *GV,
165 const TargetMachine &TM) const;
167 // isJITCodeModel - True if we're generating code for the JIT
168 bool isJITCodeModel() const { return IsJITCodeModel; }
170 // isLittleEndian - True if generating little-endian code
171 bool isLittleEndian() const { return IsLittleEndian; }
173 // Specific obvious features.
174 bool hasFSQRT() const { return HasFSQRT; }
175 bool hasFRE() const { return HasFRE; }
176 bool hasFRES() const { return HasFRES; }
177 bool hasFRSQRTE() const { return HasFRSQRTE; }
178 bool hasFRSQRTES() const { return HasFRSQRTES; }
179 bool hasRecipPrec() const { return HasRecipPrec; }
180 bool hasSTFIWX() const { return HasSTFIWX; }
181 bool hasLFIWAX() const { return HasLFIWAX; }
182 bool hasFPRND() const { return HasFPRND; }
183 bool hasFPCVT() const { return HasFPCVT; }
184 bool hasAltivec() const { return HasAltivec; }
185 bool hasQPX() const { return HasQPX; }
186 bool hasMFOCRF() const { return HasMFOCRF; }
187 bool hasISEL() const { return HasISEL; }
188 bool hasPOPCNTD() const { return HasPOPCNTD; }
189 bool hasLDBRX() const { return HasLDBRX; }
190 bool isBookE() const { return IsBookE; }
192 const Triple &getTargetTriple() const { return TargetTriple; }
194 /// isDarwin - True if this is any darwin platform.
195 bool isDarwin() const { return TargetTriple.isMacOSX(); }
196 /// isBGP - True if this is a BG/P platform.
197 bool isBGP() const { return TargetTriple.getVendor() == Triple::BGP; }
198 /// isBGQ - True if this is a BG/Q platform.
199 bool isBGQ() const { return TargetTriple.getVendor() == Triple::BGQ; }
201 bool isDarwinABI() const { return isDarwin(); }
202 bool isSVR4ABI() const { return !isDarwin(); }
204 /// enablePostRAScheduler - True at 'More' optimization.
205 bool enablePostRAScheduler(CodeGenOpt::Level OptLevel,
206 TargetSubtargetInfo::AntiDepBreakMode& Mode,
207 RegClassVector& CriticalPathRCs) const;
209 } // End llvm namespace