PPCSubtarget.h revision 198090 
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 TargetSubtarget.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef POWERPCSUBTARGET_H
15#define POWERPCSUBTARGET_H
16
17#include "llvm/Target/TargetInstrItineraries.h"
18#include "llvm/Target/TargetSubtarget.h"
19
20#include <string>
21
22// GCC #defines PPC on Linux but we use it as our namespace name
23#undef PPC
24
25namespace llvm {
26
27namespace PPC {
28  // -m directive values.
29  enum {
30    DIR_NONE,
31    DIR_32,
32    DIR_601,
33    DIR_602,
34    DIR_603,
35    DIR_7400,
36    DIR_750,
37    DIR_970,
38    DIR_64
39  };
40}
41
42class GlobalValue;
43class TargetMachine;
44
45class PPCSubtarget : public TargetSubtarget {
46protected:
47  /// stackAlignment - The minimum alignment known to hold of the stack frame on
48  /// entry to the function and which must be maintained by every function.
49  unsigned StackAlignment;
50
51  /// Selected instruction itineraries (one entry per itinerary class.)
52  InstrItineraryData InstrItins;
53
54  /// Which cpu directive was used.
55  unsigned DarwinDirective;
56
57  /// Used by the ISel to turn in optimizations for POWER4-derived architectures
58  bool IsGigaProcessor;
59  bool Has64BitSupport;
60  bool Use64BitRegs;
61  bool IsPPC64;
62  bool HasAltivec;
63  bool HasFSQRT;
64  bool HasSTFIWX;
65  bool HasLazyResolverStubs;
66
67  /// DarwinVers - Nonzero if this is a darwin platform.  Otherwise, the numeric
68  /// version of the platform, e.g. 8 = 10.4 (Tiger), 9 = 10.5 (Leopard), etc.
69  unsigned char DarwinVers; // Is any darwin-ppc platform.
70public:
71  /// This constructor initializes the data members to match that
72  /// of the specified triple.
73  ///
74  PPCSubtarget(const std::string &TT, const std::string &FS, bool is64Bit);
75
76  /// ParseSubtargetFeatures - Parses features string setting specified
77  /// subtarget options.  Definition of function is auto generated by tblgen.
78  std::string ParseSubtargetFeatures(const std::string &FS,
79                                     const std::string &CPU);
80
81
82  /// SetJITMode - This is called to inform the subtarget info that we are
83  /// producing code for the JIT.
84  void SetJITMode();
85
86  /// getStackAlignment - Returns the minimum alignment known to hold of the
87  /// stack frame on entry to the function and which must be maintained by every
88  /// function for this subtarget.
89  unsigned getStackAlignment() const { return StackAlignment; }
90
91  /// getDarwinDirective - Returns the -m directive specified for the cpu.
92  ///
93  unsigned getDarwinDirective() const { return DarwinDirective; }
94
95  /// getInstrItins - Return the instruction itineraies based on subtarget
96  /// selection.
97  const InstrItineraryData &getInstrItineraryData() const { return InstrItins; }
98
99  /// getTargetDataString - Return the pointer size and type alignment
100  /// properties of this subtarget.
101  const char *getTargetDataString() const {
102    // Note, the alignment values for f64 and i64 on ppc64 in Darwin
103    // documentation are wrong; these are correct (i.e. "what gcc does").
104    return isPPC64() ? "E-p:64:64-f64:64:64-i64:64:64-f128:64:128"
105                     : "E-p:32:32-f64:32:64-i64:32:64-f128:64:128";
106  }
107
108  /// isPPC64 - Return true if we are generating code for 64-bit pointer mode.
109  ///
110  bool isPPC64() const { return IsPPC64; }
111
112  /// has64BitSupport - Return true if the selected CPU supports 64-bit
113  /// instructions, regardless of whether we are in 32-bit or 64-bit mode.
114  bool has64BitSupport() const { return Has64BitSupport; }
115
116  /// use64BitRegs - Return true if in 64-bit mode or if we should use 64-bit
117  /// registers in 32-bit mode when possible.  This can only true if
118  /// has64BitSupport() returns true.
119  bool use64BitRegs() const { return Use64BitRegs; }
120
121  /// hasLazyResolverStub - Return true if accesses to the specified global have
122  /// to go through a dyld lazy resolution stub.  This means that an extra load
123  /// is required to get the address of the global.
124  bool hasLazyResolverStub(const GlobalValue *GV,
125                           const TargetMachine &TM) const;
126
127  // Specific obvious features.
128  bool hasFSQRT() const { return HasFSQRT; }
129  bool hasSTFIWX() const { return HasSTFIWX; }
130  bool hasAltivec() const { return HasAltivec; }
131  bool isGigaProcessor() const { return IsGigaProcessor; }
132
133  /// isDarwin - True if this is any darwin platform.
134  bool isDarwin() const { return DarwinVers != 0; }
135  /// isDarwin - True if this is darwin9 (leopard, 10.5) or above.
136  bool isDarwin9() const { return DarwinVers >= 9; }
137
138  /// getDarwinVers - Return the darwin version number, 8 = tiger, 9 = leopard.
139  unsigned getDarwinVers() const { return DarwinVers; }
140
141  bool isDarwinABI() const { return isDarwin(); }
142  bool isSVR4ABI() const { return !isDarwin(); }
143
144};
145} // End llvm namespace
146
147#endif
148