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