PPCSubtarget.h revision 869eca129b2560a59b8aa0e8fd57b5d8f7de1f96 
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/ADT/Triple.h"
18#include "llvm/Target/TargetInstrItineraries.h"
19#include "llvm/Target/TargetSubtarget.h"
20
21#include <string>
22
23// GCC #defines PPC on Linux but we use it as our namespace name
24#undef PPC
25
26namespace llvm {
27
28namespace PPC {
29  // -m directive values.
30  enum {
31    DIR_NONE,
32    DIR_32,
33    DIR_601,
34    DIR_602,
35    DIR_603,
36    DIR_7400,
37    DIR_750,
38    DIR_970,
39    DIR_64
40  };
41}
42
43class GlobalValue;
44class TargetMachine;
45
46class PPCSubtarget : public TargetSubtarget {
47protected:
48  /// stackAlignment - The minimum alignment known to hold of the stack frame on
49  /// entry to the function and which must be maintained by every function.
50  unsigned StackAlignment;
51
52  /// Selected instruction itineraries (one entry per itinerary class.)
53  InstrItineraryData InstrItins;
54
55  /// Which cpu directive was used.
56  unsigned DarwinDirective;
57
58  /// Used by the ISel to turn in optimizations for POWER4-derived architectures
59  bool IsGigaProcessor;
60  bool Has64BitSupport;
61  bool Use64BitRegs;
62  bool IsPPC64;
63  bool HasAltivec;
64  bool HasFSQRT;
65  bool HasSTFIWX;
66  bool HasLazyResolverStubs;
67  bool IsJITCodeModel;
68
69  /// DarwinVers - Nonzero if this is a darwin platform.  Otherwise, the numeric
70  /// version of the platform, e.g. 8 = 10.4 (Tiger), 9 = 10.5 (Leopard), etc.
71  unsigned char DarwinVers; // Is any darwin-ppc platform.
72
73  /// TargetTriple - What processor and OS we're targeting.
74  Triple TargetTriple;
75
76public:
77  /// This constructor initializes the data members to match that
78  /// of the specified triple.
79  ///
80  PPCSubtarget(const std::string &TT, const std::string &FS, bool is64Bit);
81
82  /// ParseSubtargetFeatures - Parses features string setting specified
83  /// subtarget options.  Definition of function is auto generated by tblgen.
84  std::string ParseSubtargetFeatures(const std::string &FS,
85                                     const std::string &CPU);
86
87
88  /// SetJITMode - This is called to inform the subtarget info that we are
89  /// producing code for the JIT.
90  void SetJITMode();
91
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; }
96
97  /// getDarwinDirective - Returns the -m directive specified for the cpu.
98  ///
99  unsigned getDarwinDirective() const { return DarwinDirective; }
100
101  /// getInstrItins - Return the instruction itineraies based on subtarget
102  /// selection.
103  const InstrItineraryData &getInstrItineraryData() const { return InstrItins; }
104
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-f64:32:64-i64:32:64-f128:64:128-n32";
112  }
113
114  /// isPPC64 - Return true if we are generating code for 64-bit pointer mode.
115  ///
116  bool isPPC64() const { return IsPPC64; }
117
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; }
121
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; }
126
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;
132
133  // isJITCodeModel - True if we're generating code for the JIT
134  bool isJITCodeModel() const { return IsJITCodeModel; }
135
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
142  const Triple &getTargetTriple() const { return TargetTriple; }
143
144  /// isDarwin - True if this is any darwin platform.
145  bool isDarwin() const { return DarwinVers != 0; }
146  /// isDarwin - True if this is darwin9 (leopard, 10.5) or above.
147  bool isDarwin9() const { return DarwinVers >= 9; }
148
149  /// getDarwinVers - Return the darwin version number, 8 = tiger, 9 = leopard.
150  unsigned getDarwinVers() const { return DarwinVers; }
151
152  bool isDarwinABI() const { return isDarwin(); }
153  bool isSVR4ABI() const { return !isDarwin(); }
154
155};
156} // End llvm namespace
157
158#endif
159