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.
55 class PPCSubtarget : public PPCGenSubtargetInfo {
57 /// stackAlignment - The minimum alignment known to hold of the stack frame on
58 /// entry to the function and which must be maintained by every function.
59 unsigned StackAlignment;
61 /// Selected instruction itineraries (one entry per itinerary class.)
62 InstrItineraryData InstrItins;
64 /// Which cpu directive was used.
65 unsigned DarwinDirective;
67 /// Used by the ISel to turn in optimizations for POWER4-derived architectures
78 bool HasLazyResolverStubs;
81 /// TargetTriple - What processor and OS we're targeting.
85 /// This constructor initializes the data members to match that
86 /// of the specified triple.
88 PPCSubtarget(const std::string &TT, const std::string &CPU,
89 const std::string &FS, bool is64Bit);
91 /// ParseSubtargetFeatures - Parses features string setting specified
92 /// subtarget options. Definition of function is auto generated by tblgen.
93 void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
95 /// SetJITMode - This is called to inform the subtarget info that we are
96 /// producing code for the JIT.
99 /// getStackAlignment - Returns the minimum alignment known to hold of the
100 /// stack frame on entry to the function and which must be maintained by every
101 /// function for this subtarget.
102 unsigned getStackAlignment() const { return StackAlignment; }
104 /// getDarwinDirective - Returns the -m directive specified for the cpu.
106 unsigned getDarwinDirective() const { return DarwinDirective; }
108 /// getInstrItins - Return the instruction itineraies based on subtarget
110 const InstrItineraryData &getInstrItineraryData() const { return InstrItins; }
112 /// getDataLayoutString - Return the pointer size and type alignment
113 /// properties of this subtarget.
114 const char *getDataLayoutString() const {
115 // Note, the alignment values for f64 and i64 on ppc64 in Darwin
116 // documentation are wrong; these are correct (i.e. "what gcc does").
117 if (isPPC64() && isSVR4ABI()) {
118 if (TargetTriple.getOS() == llvm::Triple::FreeBSD)
119 return "E-p:64:64-f64:64:64-i64:64:64-f128:64:64-v128:128:128-n32:64";
121 return "E-p:64:64-f64:64:64-i64:64:64-f128:128:128-v128:128:128-n32:64";
124 return isPPC64() ? "E-p:64:64-f64:64:64-i64:64:64-f128:64:128-n32:64"
125 : "E-p:32:32-f64:64:64-i64:64:64-f128:64:128-n32";
128 /// isPPC64 - Return true if we are generating code for 64-bit pointer mode.
130 bool isPPC64() const { return IsPPC64; }
132 /// has64BitSupport - Return true if the selected CPU supports 64-bit
133 /// instructions, regardless of whether we are in 32-bit or 64-bit mode.
134 bool has64BitSupport() const { return Has64BitSupport; }
136 /// use64BitRegs - Return true if in 64-bit mode or if we should use 64-bit
137 /// registers in 32-bit mode when possible. This can only true if
138 /// has64BitSupport() returns true.
139 bool use64BitRegs() const { return Use64BitRegs; }
141 /// hasLazyResolverStub - Return true if accesses to the specified global have
142 /// to go through a dyld lazy resolution stub. This means that an extra load
143 /// is required to get the address of the global.
144 bool hasLazyResolverStub(const GlobalValue *GV,
145 const TargetMachine &TM) const;
147 // isJITCodeModel - True if we're generating code for the JIT
148 bool isJITCodeModel() const { return IsJITCodeModel; }
150 // Specific obvious features.
151 bool hasFSQRT() const { return HasFSQRT; }
152 bool hasSTFIWX() const { return HasSTFIWX; }
153 bool hasAltivec() const { return HasAltivec; }
154 bool hasQPX() const { return HasQPX; }
155 bool hasMFOCRF() const { return HasMFOCRF; }
156 bool hasISEL() const { return HasISEL; }
157 bool isBookE() const { return IsBookE; }
159 const Triple &getTargetTriple() const { return TargetTriple; }
161 /// isDarwin - True if this is any darwin platform.
162 bool isDarwin() const { return TargetTriple.isMacOSX(); }
163 /// isBGP - True if this is a BG/P platform.
164 bool isBGP() const { return TargetTriple.getVendor() == Triple::BGP; }
165 /// isBGQ - True if this is a BG/Q platform.
166 bool isBGQ() const { return TargetTriple.getVendor() == Triple::BGQ; }
168 bool isDarwinABI() const { return isDarwin(); }
169 bool isSVR4ABI() const { return !isDarwin(); }
171 /// enablePostRAScheduler - True at 'More' optimization.
172 bool enablePostRAScheduler(CodeGenOpt::Level OptLevel,
173 TargetSubtargetInfo::AntiDepBreakMode& Mode,
174 RegClassVector& CriticalPathRCs) const;
176 } // End llvm namespace