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
83 bool HasFRE, HasFRES, HasFRSQRTE, HasFRSQRTES;
95 bool HasLazyResolverStubs;
99 /// TargetTriple - What processor and OS we're targeting.
103 /// This constructor initializes the data members to match that
104 /// of the specified triple.
106 PPCSubtarget(const std::string &TT, const std::string &CPU,
107 const std::string &FS, bool is64Bit,
108 CodeGenOpt::Level OptLevel);
110 /// ParseSubtargetFeatures - Parses features string setting specified
111 /// subtarget options. Definition of function is auto generated by tblgen.
112 void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
114 /// SetJITMode - This is called to inform the subtarget info that we are
115 /// producing code for the JIT.
118 /// getStackAlignment - Returns the minimum alignment known to hold of the
119 /// stack frame on entry to the function and which must be maintained by every
120 /// function for this subtarget.
121 unsigned getStackAlignment() const { return StackAlignment; }
123 /// getDarwinDirective - Returns the -m directive specified for the cpu.
125 unsigned getDarwinDirective() const { return DarwinDirective; }
127 /// getInstrItins - Return the instruction itineraies based on subtarget
129 const InstrItineraryData &getInstrItineraryData() const { return InstrItins; }
131 /// \brief Reset the features for the PowerPC target.
132 virtual void resetSubtargetFeatures(const MachineFunction *MF);
134 void initializeEnvironment();
135 void resetSubtargetFeatures(StringRef CPU, StringRef FS);
138 /// isPPC64 - Return true if we are generating code for 64-bit pointer mode.
140 bool isPPC64() const { return IsPPC64; }
142 /// has64BitSupport - Return true if the selected CPU supports 64-bit
143 /// instructions, regardless of whether we are in 32-bit or 64-bit mode.
144 bool has64BitSupport() const { return Has64BitSupport; }
146 /// use64BitRegs - Return true if in 64-bit mode or if we should use 64-bit
147 /// registers in 32-bit mode when possible. This can only true if
148 /// has64BitSupport() returns true.
149 bool use64BitRegs() const { return Use64BitRegs; }
151 /// useCRBits - Return true if we should store and manipulate i1 values in
152 /// the individual condition register bits.
153 bool useCRBits() const { return UseCRBits; }
155 /// hasLazyResolverStub - Return true if accesses to the specified global have
156 /// to go through a dyld lazy resolution stub. This means that an extra load
157 /// is required to get the address of the global.
158 bool hasLazyResolverStub(const GlobalValue *GV,
159 const TargetMachine &TM) const;
161 // isJITCodeModel - True if we're generating code for the JIT
162 bool isJITCodeModel() const { return IsJITCodeModel; }
164 // isLittleEndian - True if generating little-endian code
165 bool isLittleEndian() const { return IsLittleEndian; }
167 // Specific obvious features.
168 bool hasFCPSGN() const { return HasFCPSGN; }
169 bool hasFSQRT() const { return HasFSQRT; }
170 bool hasFRE() const { return HasFRE; }
171 bool hasFRES() const { return HasFRES; }
172 bool hasFRSQRTE() const { return HasFRSQRTE; }
173 bool hasFRSQRTES() const { return HasFRSQRTES; }
174 bool hasRecipPrec() const { return HasRecipPrec; }
175 bool hasSTFIWX() const { return HasSTFIWX; }
176 bool hasLFIWAX() const { return HasLFIWAX; }
177 bool hasFPRND() const { return HasFPRND; }
178 bool hasFPCVT() const { return HasFPCVT; }
179 bool hasAltivec() const { return HasAltivec; }
180 bool hasQPX() const { return HasQPX; }
181 bool hasVSX() const { return HasVSX; }
182 bool hasMFOCRF() const { return HasMFOCRF; }
183 bool hasISEL() const { return HasISEL; }
184 bool hasPOPCNTD() const { return HasPOPCNTD; }
185 bool hasLDBRX() const { return HasLDBRX; }
186 bool isBookE() const { return IsBookE; }
187 bool isDeprecatedMFTB() const { return DeprecatedMFTB; }
188 bool isDeprecatedDST() const { return DeprecatedDST; }
190 const Triple &getTargetTriple() const { return TargetTriple; }
192 /// isDarwin - True if this is any darwin platform.
193 bool isDarwin() const { return TargetTriple.isMacOSX(); }
194 /// isBGQ - True if this is a BG/Q platform.
195 bool isBGQ() const { return TargetTriple.getVendor() == Triple::BGQ; }
197 bool isDarwinABI() const { return isDarwin(); }
198 bool isSVR4ABI() const { return !isDarwin(); }
200 /// enablePostRAScheduler - True at 'More' optimization.
201 bool enablePostRAScheduler(CodeGenOpt::Level OptLevel,
202 TargetSubtargetInfo::AntiDepBreakMode& Mode,
203 RegClassVector& CriticalPathRCs) const;
205 // Scheduling customization.
206 bool enableMachineScheduler() const;
207 void overrideSchedPolicy(MachineSchedPolicy &Policy,
210 unsigned NumRegionInstrs) const;
213 } // End llvm namespace