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