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