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 HasLazyResolverStubs;
86 /// TargetTriple - What processor and OS we're targeting.
90 /// This constructor initializes the data members to match that
91 /// of the specified triple.
93 PPCSubtarget(const std::string &TT, const std::string &CPU,
94 const std::string &FS, bool is64Bit);
96 /// ParseSubtargetFeatures - Parses features string setting specified
97 /// subtarget options. Definition of function is auto generated by tblgen.
98 void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
100 /// SetJITMode - This is called to inform the subtarget info that we are
101 /// producing code for the JIT.
104 /// getStackAlignment - Returns the minimum alignment known to hold of the
105 /// stack frame on entry to the function and which must be maintained by every
106 /// function for this subtarget.
107 unsigned getStackAlignment() const { return StackAlignment; }
109 /// getDarwinDirective - Returns the -m directive specified for the cpu.
111 unsigned getDarwinDirective() const { return DarwinDirective; }
113 /// getInstrItins - Return the instruction itineraies based on subtarget
115 const InstrItineraryData &getInstrItineraryData() const { return InstrItins; }
117 /// getDataLayoutString - Return the pointer size and type alignment
118 /// properties of this subtarget.
119 const char *getDataLayoutString() const {
120 // Note, the alignment values for f64 and i64 on ppc64 in Darwin
121 // documentation are wrong; these are correct (i.e. "what gcc does").
122 if (isPPC64() && isSVR4ABI()) {
123 if (TargetTriple.getOS() == llvm::Triple::FreeBSD)
124 return "E-p:64:64-f64:64:64-i64:64:64-f128:64:64-v128:128:128-n32:64";
126 return "E-p:64:64-f64:64:64-i64:64:64-f128:128:128-v128:128:128-n32:64";
129 return isPPC64() ? "E-p:64:64-f64:64:64-i64:64:64-f128:64:128-n32:64"
130 : "E-p:32:32-f64:64:64-i64:64:64-f128:64:128-n32";
133 /// isPPC64 - Return true if we are generating code for 64-bit pointer mode.
135 bool isPPC64() const { return IsPPC64; }
137 /// has64BitSupport - Return true if the selected CPU supports 64-bit
138 /// instructions, regardless of whether we are in 32-bit or 64-bit mode.
139 bool has64BitSupport() const { return Has64BitSupport; }
141 /// use64BitRegs - Return true if in 64-bit mode or if we should use 64-bit
142 /// registers in 32-bit mode when possible. This can only true if
143 /// has64BitSupport() returns true.
144 bool use64BitRegs() const { return Use64BitRegs; }
146 /// hasLazyResolverStub - Return true if accesses to the specified global have
147 /// to go through a dyld lazy resolution stub. This means that an extra load
148 /// is required to get the address of the global.
149 bool hasLazyResolverStub(const GlobalValue *GV,
150 const TargetMachine &TM) const;
152 // isJITCodeModel - True if we're generating code for the JIT
153 bool isJITCodeModel() const { return IsJITCodeModel; }
155 // Specific obvious features.
156 bool hasFSQRT() const { return HasFSQRT; }
157 bool hasSTFIWX() const { return HasSTFIWX; }
158 bool hasAltivec() const { return HasAltivec; }
159 bool hasQPX() const { return HasQPX; }
160 bool hasMFOCRF() const { return HasMFOCRF; }
161 bool hasISEL() const { return HasISEL; }
162 bool isBookE() const { return IsBookE; }
164 const Triple &getTargetTriple() const { return TargetTriple; }
166 /// isDarwin - True if this is any darwin platform.
167 bool isDarwin() const { return TargetTriple.isMacOSX(); }
168 /// isBGP - True if this is a BG/P platform.
169 bool isBGP() const { return TargetTriple.getVendor() == Triple::BGP; }
170 /// isBGQ - True if this is a BG/Q platform.
171 bool isBGQ() const { return TargetTriple.getVendor() == Triple::BGQ; }
173 bool isDarwinABI() const { return isDarwin(); }
174 bool isSVR4ABI() const { return !isDarwin(); }
176 /// enablePostRAScheduler - True at 'More' optimization.
177 bool enablePostRAScheduler(CodeGenOpt::Level OptLevel,
178 TargetSubtargetInfo::AntiDepBreakMode& Mode,
179 RegClassVector& CriticalPathRCs) const;
181 } // End llvm namespace