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 LLVM_LIB_TARGET_POWERPC_PPCSUBTARGET_H
15 #define LLVM_LIB_TARGET_POWERPC_PPCSUBTARGET_H
17 #include "PPCFrameLowering.h"
18 #include "PPCISelLowering.h"
19 #include "PPCInstrInfo.h"
20 #include "PPCSelectionDAGInfo.h"
21 #include "llvm/ADT/Triple.h"
22 #include "llvm/IR/DataLayout.h"
23 #include "llvm/MC/MCInstrItineraries.h"
24 #include "llvm/Target/TargetSubtargetInfo.h"
27 #define GET_SUBTARGETINFO_HEADER
28 #include "PPCGenSubtargetInfo.inc"
30 // GCC #defines PPC on Linux but we use it as our namespace name
37 // -m directive values.
66 class PPCSubtarget : public PPCGenSubtargetInfo {
68 /// TargetTriple - What processor and OS we're targeting.
71 /// stackAlignment - The minimum alignment known to hold of the stack frame on
72 /// entry to the function and which must be maintained by every function.
73 unsigned StackAlignment;
75 /// Selected instruction itineraries (one entry per itinerary class.)
76 InstrItineraryData InstrItins;
78 /// Which cpu directive was used.
79 unsigned DarwinDirective;
81 /// Used by the ISel to turn in optimizations for POWER4-derived architectures
94 bool HasFRE, HasFRES, HasFRSQRTE, HasFRSQRTES;
111 bool HasLazyResolverStubs;
114 bool HasInvariantFunctionDescriptors;
122 PPCFrameLowering FrameLowering;
123 PPCInstrInfo InstrInfo;
124 PPCTargetLowering TLInfo;
125 PPCSelectionDAGInfo TSInfo;
128 /// This constructor initializes the data members to match that
129 /// of the specified triple.
131 PPCSubtarget(const std::string &TT, const std::string &CPU,
132 const std::string &FS, const PPCTargetMachine &TM);
134 /// ParseSubtargetFeatures - Parses features string setting specified
135 /// subtarget options. Definition of function is auto generated by tblgen.
136 void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
138 /// getStackAlignment - Returns the minimum alignment known to hold of the
139 /// stack frame on entry to the function and which must be maintained by every
140 /// function for this subtarget.
141 unsigned getStackAlignment() const { return StackAlignment; }
143 /// getDarwinDirective - Returns the -m directive specified for the cpu.
145 unsigned getDarwinDirective() const { return DarwinDirective; }
147 /// getInstrItins - Return the instruction itineraries based on subtarget
149 const InstrItineraryData *getInstrItineraryData() const override {
153 const PPCFrameLowering *getFrameLowering() const override {
154 return &FrameLowering;
156 const PPCInstrInfo *getInstrInfo() const override { return &InstrInfo; }
157 const PPCTargetLowering *getTargetLowering() const override {
160 const PPCSelectionDAGInfo *getSelectionDAGInfo() const override {
163 const PPCRegisterInfo *getRegisterInfo() const override {
164 return &getInstrInfo()->getRegisterInfo();
167 /// initializeSubtargetDependencies - Initializes using a CPU and feature string
168 /// so that we can use initializer lists for subtarget initialization.
169 PPCSubtarget &initializeSubtargetDependencies(StringRef CPU, StringRef FS);
172 void initializeEnvironment();
173 void initSubtargetFeatures(StringRef CPU, StringRef FS);
176 /// isPPC64 - Return true if we are generating code for 64-bit pointer mode.
178 bool isPPC64() const { return IsPPC64; }
180 /// has64BitSupport - Return true if the selected CPU supports 64-bit
181 /// instructions, regardless of whether we are in 32-bit or 64-bit mode.
182 bool has64BitSupport() const { return Has64BitSupport; }
184 /// use64BitRegs - Return true if in 64-bit mode or if we should use 64-bit
185 /// registers in 32-bit mode when possible. This can only true if
186 /// has64BitSupport() returns true.
187 bool use64BitRegs() const { return Use64BitRegs; }
189 /// useCRBits - Return true if we should store and manipulate i1 values in
190 /// the individual condition register bits.
191 bool useCRBits() const { return UseCRBits; }
193 /// hasLazyResolverStub - Return true if accesses to the specified global have
194 /// to go through a dyld lazy resolution stub. This means that an extra load
195 /// is required to get the address of the global.
196 bool hasLazyResolverStub(const GlobalValue *GV,
197 const TargetMachine &TM) const;
199 // isLittleEndian - True if generating little-endian code
200 bool isLittleEndian() const { return IsLittleEndian; }
202 // Specific obvious features.
203 bool hasFCPSGN() const { return HasFCPSGN; }
204 bool hasFSQRT() const { return HasFSQRT; }
205 bool hasFRE() const { return HasFRE; }
206 bool hasFRES() const { return HasFRES; }
207 bool hasFRSQRTE() const { return HasFRSQRTE; }
208 bool hasFRSQRTES() const { return HasFRSQRTES; }
209 bool hasRecipPrec() const { return HasRecipPrec; }
210 bool hasSTFIWX() const { return HasSTFIWX; }
211 bool hasLFIWAX() const { return HasLFIWAX; }
212 bool hasFPRND() const { return HasFPRND; }
213 bool hasFPCVT() const { return HasFPCVT; }
214 bool hasAltivec() const { return HasAltivec; }
215 bool hasSPE() const { return HasSPE; }
216 bool hasQPX() const { return HasQPX; }
217 bool hasVSX() const { return HasVSX; }
218 bool hasP8Vector() const { return HasP8Vector; }
219 bool hasMFOCRF() const { return HasMFOCRF; }
220 bool hasISEL() const { return HasISEL; }
221 bool hasPOPCNTD() const { return HasPOPCNTD; }
222 bool hasCMPB() const { return HasCMPB; }
223 bool hasLDBRX() const { return HasLDBRX; }
224 bool isBookE() const { return IsBookE; }
225 bool hasOnlyMSYNC() const { return HasOnlyMSYNC; }
226 bool isPPC4xx() const { return IsPPC4xx; }
227 bool isPPC6xx() const { return IsPPC6xx; }
228 bool isE500() const { return IsE500; }
229 bool isDeprecatedMFTB() const { return DeprecatedMFTB; }
230 bool isDeprecatedDST() const { return DeprecatedDST; }
231 bool hasICBT() const { return HasICBT; }
232 bool hasInvariantFunctionDescriptors() const {
233 return HasInvariantFunctionDescriptors;
236 const Triple &getTargetTriple() const { return TargetTriple; }
238 /// isDarwin - True if this is any darwin platform.
239 bool isDarwin() const { return TargetTriple.isMacOSX(); }
240 /// isBGQ - True if this is a BG/Q platform.
241 bool isBGQ() const { return TargetTriple.getVendor() == Triple::BGQ; }
243 bool isTargetELF() const { return TargetTriple.isOSBinFormatELF(); }
244 bool isTargetMachO() const { return TargetTriple.isOSBinFormatMachO(); }
246 bool isDarwinABI() const { return isDarwin(); }
247 bool isSVR4ABI() const { return !isDarwin(); }
248 bool isELFv2ABI() const { return TargetABI == PPC_ABI_ELFv2; }
250 bool enableEarlyIfConversion() const override { return hasISEL(); }
252 // Scheduling customization.
253 bool enableMachineScheduler() const override;
254 // This overrides the PostRAScheduler bit in the SchedModel for each CPU.
255 bool enablePostMachineScheduler() const override;
256 AntiDepBreakMode getAntiDepBreakMode() const override;
257 void getCriticalPathRCs(RegClassVector &CriticalPathRCs) const override;
259 void overrideSchedPolicy(MachineSchedPolicy &Policy,
262 unsigned NumRegionInstrs) const override;
263 bool useAA() const override;
265 bool enableSubRegLiveness() const override;
267 } // End llvm namespace