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