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 "PPCFrameLowering.h"
18 #include "PPCInstrInfo.h"
19 #include "PPCISelLowering.h"
20 #include "PPCJITInfo.h"
21 #include "PPCSelectionDAGInfo.h"
22 #include "llvm/ADT/Triple.h"
23 #include "llvm/IR/DataLayout.h"
24 #include "llvm/MC/MCInstrItineraries.h"
25 #include "llvm/Target/TargetSubtargetInfo.h"
28 #define GET_SUBTARGETINFO_HEADER
29 #include "PPCGenSubtargetInfo.inc"
31 // GCC #defines PPC on Linux but we use it as our namespace name
38 // -m directive values.
67 class PPCSubtarget : public PPCGenSubtargetInfo {
69 /// stackAlignment - The minimum alignment known to hold of the stack frame on
70 /// entry to the function and which must be maintained by every function.
71 unsigned StackAlignment;
73 /// Selected instruction itineraries (one entry per itinerary class.)
74 InstrItineraryData InstrItins;
76 /// Which cpu directive was used.
77 unsigned DarwinDirective;
79 /// Used by the ISel to turn in optimizations for POWER4-derived architectures
90 bool HasFRE, HasFRES, HasFRSQRTE, HasFRSQRTES;
102 bool HasLazyResolverStubs;
106 /// TargetTriple - What processor and OS we're targeting.
109 /// OptLevel - What default optimization level we're emitting code for.
110 CodeGenOpt::Level OptLevel;
118 PPCFrameLowering FrameLowering;
120 PPCInstrInfo InstrInfo;
122 PPCTargetLowering TLInfo;
123 PPCSelectionDAGInfo TSInfo;
126 /// This constructor initializes the data members to match that
127 /// of the specified triple.
129 PPCSubtarget(const std::string &TT, const std::string &CPU,
130 const std::string &FS, PPCTargetMachine &TM, bool is64Bit,
131 CodeGenOpt::Level OptLevel);
133 /// ParseSubtargetFeatures - Parses features string setting specified
134 /// subtarget options. Definition of function is auto generated by tblgen.
135 void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
137 /// SetJITMode - This is called to inform the subtarget info that we are
138 /// producing code for the JIT.
141 /// getStackAlignment - Returns the minimum alignment known to hold of the
142 /// stack frame on entry to the function and which must be maintained by every
143 /// function for this subtarget.
144 unsigned getStackAlignment() const { return StackAlignment; }
146 /// getDarwinDirective - Returns the -m directive specified for the cpu.
148 unsigned getDarwinDirective() const { return DarwinDirective; }
150 /// getInstrItins - Return the instruction itineraries based on subtarget
152 const InstrItineraryData &getInstrItineraryData() const { return InstrItins; }
154 const PPCFrameLowering *getFrameLowering() const { return &FrameLowering; }
155 const DataLayout *getDataLayout() const { return &DL; }
156 const PPCInstrInfo *getInstrInfo() const { return &InstrInfo; }
157 PPCJITInfo *getJITInfo() { return &JITInfo; }
158 const PPCTargetLowering *getTargetLowering() const { return &TLInfo; }
159 const PPCSelectionDAGInfo *getSelectionDAGInfo() const { return &TSInfo; }
161 /// initializeSubtargetDependencies - Initializes using a CPU and feature string
162 /// so that we can use initializer lists for subtarget initialization.
163 PPCSubtarget &initializeSubtargetDependencies(StringRef CPU, StringRef FS);
165 /// \brief Reset the features for the PowerPC target.
166 void resetSubtargetFeatures(const MachineFunction *MF) override;
168 void initializeEnvironment();
169 void resetSubtargetFeatures(StringRef CPU, StringRef FS);
172 /// isPPC64 - Return true if we are generating code for 64-bit pointer mode.
174 bool isPPC64() const { return IsPPC64; }
176 /// has64BitSupport - Return true if the selected CPU supports 64-bit
177 /// instructions, regardless of whether we are in 32-bit or 64-bit mode.
178 bool has64BitSupport() const { return Has64BitSupport; }
180 /// use64BitRegs - Return true if in 64-bit mode or if we should use 64-bit
181 /// registers in 32-bit mode when possible. This can only true if
182 /// has64BitSupport() returns true.
183 bool use64BitRegs() const { return Use64BitRegs; }
185 /// useCRBits - Return true if we should store and manipulate i1 values in
186 /// the individual condition register bits.
187 bool useCRBits() const { return UseCRBits; }
189 /// hasLazyResolverStub - Return true if accesses to the specified global have
190 /// to go through a dyld lazy resolution stub. This means that an extra load
191 /// is required to get the address of the global.
192 bool hasLazyResolverStub(const GlobalValue *GV,
193 const TargetMachine &TM) const;
195 // isJITCodeModel - True if we're generating code for the JIT
196 bool isJITCodeModel() const { return IsJITCodeModel; }
198 // isLittleEndian - True if generating little-endian code
199 bool isLittleEndian() const { return IsLittleEndian; }
201 // Specific obvious features.
202 bool hasFCPSGN() const { return HasFCPSGN; }
203 bool hasFSQRT() const { return HasFSQRT; }
204 bool hasFRE() const { return HasFRE; }
205 bool hasFRES() const { return HasFRES; }
206 bool hasFRSQRTE() const { return HasFRSQRTE; }
207 bool hasFRSQRTES() const { return HasFRSQRTES; }
208 bool hasRecipPrec() const { return HasRecipPrec; }
209 bool hasSTFIWX() const { return HasSTFIWX; }
210 bool hasLFIWAX() const { return HasLFIWAX; }
211 bool hasFPRND() const { return HasFPRND; }
212 bool hasFPCVT() const { return HasFPCVT; }
213 bool hasAltivec() const { return HasAltivec; }
214 bool hasQPX() const { return HasQPX; }
215 bool hasVSX() const { return HasVSX; }
216 bool hasMFOCRF() const { return HasMFOCRF; }
217 bool hasISEL() const { return HasISEL; }
218 bool hasPOPCNTD() const { return HasPOPCNTD; }
219 bool hasLDBRX() const { return HasLDBRX; }
220 bool isBookE() const { return IsBookE; }
221 bool isDeprecatedMFTB() const { return DeprecatedMFTB; }
222 bool isDeprecatedDST() const { return DeprecatedDST; }
224 const Triple &getTargetTriple() const { return TargetTriple; }
226 /// isDarwin - True if this is any darwin platform.
227 bool isDarwin() const { return TargetTriple.isMacOSX(); }
228 /// isBGQ - True if this is a BG/Q platform.
229 bool isBGQ() const { return TargetTriple.getVendor() == Triple::BGQ; }
231 bool isTargetELF() const { return TargetTriple.isOSBinFormatELF(); }
232 bool isTargetMachO() const { return TargetTriple.isOSBinFormatMachO(); }
234 bool isDarwinABI() const { return isDarwin(); }
235 bool isSVR4ABI() const { return !isDarwin(); }
236 bool isELFv2ABI() const { return TargetABI == PPC_ABI_ELFv2; }
238 bool enableEarlyIfConversion() const override { return hasISEL(); }
240 // Scheduling customization.
241 bool enableMachineScheduler() const override;
242 // This overrides the PostRAScheduler bit in the SchedModel for each CPU.
243 bool enablePostMachineScheduler() const override;
244 AntiDepBreakMode getAntiDepBreakMode() const override;
245 void getCriticalPathRCs(RegClassVector &CriticalPathRCs) const override;
247 void overrideSchedPolicy(MachineSchedPolicy &Policy,
250 unsigned NumRegionInstrs) const override;
251 bool useAA() const override;
253 } // End llvm namespace