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
81 bool HasFRE, HasFRES, HasFRSQRTE, HasFRSQRTES;
93 bool HasLazyResolverStubs;
97 /// TargetTriple - What processor and OS we're targeting.
101 /// This constructor initializes the data members to match that
102 /// of the specified triple.
104 PPCSubtarget(const std::string &TT, const std::string &CPU,
105 const std::string &FS, bool is64Bit);
107 /// ParseSubtargetFeatures - Parses features string setting specified
108 /// subtarget options. Definition of function is auto generated by tblgen.
109 void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
111 /// SetJITMode - This is called to inform the subtarget info that we are
112 /// producing code for the JIT.
115 /// getStackAlignment - Returns the minimum alignment known to hold of the
116 /// stack frame on entry to the function and which must be maintained by every
117 /// function for this subtarget.
118 unsigned getStackAlignment() const { return StackAlignment; }
120 /// getDarwinDirective - Returns the -m directive specified for the cpu.
122 unsigned getDarwinDirective() const { return DarwinDirective; }
124 /// getInstrItins - Return the instruction itineraies based on subtarget
126 const InstrItineraryData &getInstrItineraryData() const { return InstrItins; }
128 /// getDataLayoutString - Return the pointer size and type alignment
129 /// properties of this subtarget.
130 const char *getDataLayoutString() const {
131 // Note, the alignment values for f64 and i64 on ppc64 in Darwin
132 // documentation are wrong; these are correct (i.e. "what gcc does").
133 if (isPPC64() && isSVR4ABI()) {
134 if (TargetTriple.getOS() == llvm::Triple::FreeBSD)
135 return "E-p:64:64-f64:64:64-i64:64:64-v128:128:128-n32:64";
137 return "E-p:64:64-f64:64:64-i64:64:64-f128:128:128-v128:128:128-n32:64";
140 return isPPC64() ? "E-p:64:64-f64:64:64-i64:64:64-f128:64:128-n32:64"
141 : "E-p:32:32-f64:64:64-i64:64:64-f128:64:128-n32";
144 /// \brief Reset the features for the PowerPC target.
145 virtual void resetSubtargetFeatures(const MachineFunction *MF);
147 void initializeEnvironment();
148 void resetSubtargetFeatures(StringRef CPU, StringRef FS);
151 /// isPPC64 - Return true if we are generating code for 64-bit pointer mode.
153 bool isPPC64() const { return IsPPC64; }
155 /// has64BitSupport - Return true if the selected CPU supports 64-bit
156 /// instructions, regardless of whether we are in 32-bit or 64-bit mode.
157 bool has64BitSupport() const { return Has64BitSupport; }
159 /// use64BitRegs - Return true if in 64-bit mode or if we should use 64-bit
160 /// registers in 32-bit mode when possible. This can only true if
161 /// has64BitSupport() returns true.
162 bool use64BitRegs() const { return Use64BitRegs; }
164 /// hasLazyResolverStub - Return true if accesses to the specified global have
165 /// to go through a dyld lazy resolution stub. This means that an extra load
166 /// is required to get the address of the global.
167 bool hasLazyResolverStub(const GlobalValue *GV,
168 const TargetMachine &TM) const;
170 // isJITCodeModel - True if we're generating code for the JIT
171 bool isJITCodeModel() const { return IsJITCodeModel; }
173 // isLittleEndian - True if generating little-endian code
174 bool isLittleEndian() const { return IsLittleEndian; }
176 // Specific obvious features.
177 bool hasFCPSGN() const { return HasFCPSGN; }
178 bool hasFSQRT() const { return HasFSQRT; }
179 bool hasFRE() const { return HasFRE; }
180 bool hasFRES() const { return HasFRES; }
181 bool hasFRSQRTE() const { return HasFRSQRTE; }
182 bool hasFRSQRTES() const { return HasFRSQRTES; }
183 bool hasRecipPrec() const { return HasRecipPrec; }
184 bool hasSTFIWX() const { return HasSTFIWX; }
185 bool hasLFIWAX() const { return HasLFIWAX; }
186 bool hasFPRND() const { return HasFPRND; }
187 bool hasFPCVT() const { return HasFPCVT; }
188 bool hasAltivec() const { return HasAltivec; }
189 bool hasQPX() const { return HasQPX; }
190 bool hasMFOCRF() const { return HasMFOCRF; }
191 bool hasISEL() const { return HasISEL; }
192 bool hasPOPCNTD() const { return HasPOPCNTD; }
193 bool hasLDBRX() const { return HasLDBRX; }
194 bool isBookE() const { return IsBookE; }
195 bool isDeprecatedMFTB() const { return DeprecatedMFTB; }
196 bool isDeprecatedDST() const { return DeprecatedDST; }
198 const Triple &getTargetTriple() const { return TargetTriple; }
200 /// isDarwin - True if this is any darwin platform.
201 bool isDarwin() const { return TargetTriple.isMacOSX(); }
202 /// isBGP - True if this is a BG/P platform.
203 bool isBGP() const { return TargetTriple.getVendor() == Triple::BGP; }
204 /// isBGQ - True if this is a BG/Q platform.
205 bool isBGQ() const { return TargetTriple.getVendor() == Triple::BGQ; }
207 bool isDarwinABI() const { return isDarwin(); }
208 bool isSVR4ABI() const { return !isDarwin(); }
210 /// enablePostRAScheduler - True at 'More' optimization.
211 bool enablePostRAScheduler(CodeGenOpt::Level OptLevel,
212 TargetSubtargetInfo::AntiDepBreakMode& Mode,
213 RegClassVector& CriticalPathRCs) const;
215 // Scheduling customization.
216 bool enableMachineScheduler() const;
217 void overrideSchedPolicy(MachineSchedPolicy &Policy,
220 unsigned NumRegionInstrs) const;
223 } // End llvm namespace