PPCSubtarget.h revision 263508 
1//===-- PPCSubtarget.h - Define Subtarget for the PPC ----------*- C++ -*--===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file declares the PowerPC specific subclass of TargetSubtargetInfo.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef POWERPCSUBTARGET_H
15#define POWERPCSUBTARGET_H
16
17#include "llvm/ADT/Triple.h"
18#include "llvm/MC/MCInstrItineraries.h"
19#include "llvm/Target/TargetSubtargetInfo.h"
20#include <string>
21
22#define GET_SUBTARGETINFO_HEADER
23#include "PPCGenSubtargetInfo.inc"
24
25// GCC #defines PPC on Linux but we use it as our namespace name
26#undef PPC
27
28namespace llvm {
29class StringRef;
30
31namespace PPC {
32  // -m directive values.
33  enum {
34    DIR_NONE,
35    DIR_32,
36    DIR_440,
37    DIR_601,
38    DIR_602,
39    DIR_603,
40    DIR_7400,
41    DIR_750,
42    DIR_970,
43    DIR_A2,
44    DIR_E500mc,
45    DIR_E5500,
46    DIR_PWR3,
47    DIR_PWR4,
48    DIR_PWR5,
49    DIR_PWR5X,
50    DIR_PWR6,
51    DIR_PWR6X,
52    DIR_PWR7,
53    DIR_64
54  };
55}
56
57class GlobalValue;
58class TargetMachine;
59
60class PPCSubtarget : public PPCGenSubtargetInfo {
61protected:
62  /// stackAlignment - The minimum alignment known to hold of the stack frame on
63  /// entry to the function and which must be maintained by every function.
64  unsigned StackAlignment;
65
66  /// Selected instruction itineraries (one entry per itinerary class.)
67  InstrItineraryData InstrItins;
68
69  /// Which cpu directive was used.
70  unsigned DarwinDirective;
71
72  /// Used by the ISel to turn in optimizations for POWER4-derived architectures
73  bool HasMFOCRF;
74  bool Has64BitSupport;
75  bool Use64BitRegs;
76  bool IsPPC64;
77  bool HasAltivec;
78  bool HasQPX;
79  bool HasVSX;
80  bool HasFCPSGN;
81  bool HasFSQRT;
82  bool HasFRE, HasFRES, HasFRSQRTE, HasFRSQRTES;
83  bool HasRecipPrec;
84  bool HasSTFIWX;
85  bool HasLFIWAX;
86  bool HasFPRND;
87  bool HasFPCVT;
88  bool HasISEL;
89  bool HasPOPCNTD;
90  bool HasLDBRX;
91  bool IsBookE;
92  bool DeprecatedMFTB;
93  bool DeprecatedDST;
94  bool HasLazyResolverStubs;
95  bool IsJITCodeModel;
96  bool IsLittleEndian;
97
98  /// TargetTriple - What processor and OS we're targeting.
99  Triple TargetTriple;
100
101public:
102  /// This constructor initializes the data members to match that
103  /// of the specified triple.
104  ///
105  PPCSubtarget(const std::string &TT, const std::string &CPU,
106               const std::string &FS, bool is64Bit);
107
108  /// ParseSubtargetFeatures - Parses features string setting specified
109  /// subtarget options.  Definition of function is auto generated by tblgen.
110  void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
111
112  /// SetJITMode - This is called to inform the subtarget info that we are
113  /// producing code for the JIT.
114  void SetJITMode();
115
116  /// getStackAlignment - Returns the minimum alignment known to hold of the
117  /// stack frame on entry to the function and which must be maintained by every
118  /// function for this subtarget.
119  unsigned getStackAlignment() const { return StackAlignment; }
120
121  /// getDarwinDirective - Returns the -m directive specified for the cpu.
122  ///
123  unsigned getDarwinDirective() const { return DarwinDirective; }
124
125  /// getInstrItins - Return the instruction itineraies based on subtarget
126  /// selection.
127  const InstrItineraryData &getInstrItineraryData() const { return InstrItins; }
128
129  /// getDataLayoutString - Return the pointer size and type alignment
130  /// properties of this subtarget.
131  const char *getDataLayoutString() const {
132    // Note, the alignment values for f64 and i64 on ppc64 in Darwin
133    // documentation are wrong; these are correct (i.e. "what gcc does").
134    if (isPPC64() && isSVR4ABI()) {
135      if (TargetTriple.getOS() == llvm::Triple::FreeBSD)
136        return "E-p:64:64-f64:64:64-i64:64:64-v128:128:128-n32:64";
137      else
138        return "E-p:64:64-f64:64:64-i64:64:64-f128:128:128-v128:128:128-n32:64";
139    }
140
141    return isPPC64() ? "E-p:64:64-f64:64:64-i64:64:64-f128:64:128-n32:64"
142                     : "E-p:32:32-f64:64:64-i64:64:64-f128:64:128-n32";
143  }
144
145  /// \brief Reset the features for the PowerPC target.
146  virtual void resetSubtargetFeatures(const MachineFunction *MF);
147private:
148  void initializeEnvironment();
149  void resetSubtargetFeatures(StringRef CPU, StringRef FS);
150
151public:
152  /// isPPC64 - Return true if we are generating code for 64-bit pointer mode.
153  ///
154  bool isPPC64() const { return IsPPC64; }
155
156  /// has64BitSupport - Return true if the selected CPU supports 64-bit
157  /// instructions, regardless of whether we are in 32-bit or 64-bit mode.
158  bool has64BitSupport() const { return Has64BitSupport; }
159
160  /// use64BitRegs - Return true if in 64-bit mode or if we should use 64-bit
161  /// registers in 32-bit mode when possible.  This can only true if
162  /// has64BitSupport() returns true.
163  bool use64BitRegs() const { return Use64BitRegs; }
164
165  /// hasLazyResolverStub - Return true if accesses to the specified global have
166  /// to go through a dyld lazy resolution stub.  This means that an extra load
167  /// is required to get the address of the global.
168  bool hasLazyResolverStub(const GlobalValue *GV,
169                           const TargetMachine &TM) const;
170
171  // isJITCodeModel - True if we're generating code for the JIT
172  bool isJITCodeModel() const { return IsJITCodeModel; }
173
174  // isLittleEndian - True if generating little-endian code
175  bool isLittleEndian() const { return IsLittleEndian; }
176
177  // Specific obvious features.
178  bool hasFCPSGN() const { return HasFCPSGN; }
179  bool hasFSQRT() const { return HasFSQRT; }
180  bool hasFRE() const { return HasFRE; }
181  bool hasFRES() const { return HasFRES; }
182  bool hasFRSQRTE() const { return HasFRSQRTE; }
183  bool hasFRSQRTES() const { return HasFRSQRTES; }
184  bool hasRecipPrec() const { return HasRecipPrec; }
185  bool hasSTFIWX() const { return HasSTFIWX; }
186  bool hasLFIWAX() const { return HasLFIWAX; }
187  bool hasFPRND() const { return HasFPRND; }
188  bool hasFPCVT() const { return HasFPCVT; }
189  bool hasAltivec() const { return HasAltivec; }
190  bool hasQPX() const { return HasQPX; }
191  bool hasMFOCRF() const { return HasMFOCRF; }
192  bool hasISEL() const { return HasISEL; }
193  bool hasPOPCNTD() const { return HasPOPCNTD; }
194  bool hasLDBRX() const { return HasLDBRX; }
195  bool isBookE() const { return IsBookE; }
196  bool isDeprecatedMFTB() const { return DeprecatedMFTB; }
197  bool isDeprecatedDST() const { return DeprecatedDST; }
198
199  const Triple &getTargetTriple() const { return TargetTriple; }
200
201  /// isDarwin - True if this is any darwin platform.
202  bool isDarwin() const { return TargetTriple.isMacOSX(); }
203  /// isBGP - True if this is a BG/P platform.
204  bool isBGP() const { return TargetTriple.getVendor() == Triple::BGP; }
205  /// isBGQ - True if this is a BG/Q platform.
206  bool isBGQ() const { return TargetTriple.getVendor() == Triple::BGQ; }
207
208  bool isDarwinABI() const { return isDarwin(); }
209  bool isSVR4ABI() const { return !isDarwin(); }
210
211  /// enablePostRAScheduler - True at 'More' optimization.
212  bool enablePostRAScheduler(CodeGenOpt::Level OptLevel,
213                             TargetSubtargetInfo::AntiDepBreakMode& Mode,
214                             RegClassVector& CriticalPathRCs) const;
215
216  // Scheduling customization.
217  bool enableMachineScheduler() const;
218  void overrideSchedPolicy(MachineSchedPolicy &Policy,
219                           MachineInstr *begin,
220                           MachineInstr *end,
221                           unsigned NumRegionInstrs) const;
222  bool useAA() const;
223};
224} // End llvm namespace
225
226#endif
227