PPCSubtarget.h revision 2f6fea90a54787d873cfc25f33668cb4cc7d6e1e 
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 Module;
43class GlobalValue;
44class TargetMachine;
45
46class PPCSubtarget : public TargetSubtarget {
47public:
48  enum AsmWriterFlavorTy {
49    OldMnemonic, NewMnemonic, Unset
50  };
51protected:
52  const TargetMachine &TM;
53
54  /// stackAlignment - The minimum alignment known to hold of the stack frame on
55  /// entry to the function and which must be maintained by every function.
56  unsigned StackAlignment;
57
58  /// Selected instruction itineraries (one entry per itinerary class.)
59  InstrItineraryData InstrItins;
60
61  /// Which cpu directive was used.
62  unsigned DarwinDirective;
63
64  /// AsmFlavor - Which PPC asm dialect to use.
65  AsmWriterFlavorTy AsmFlavor;
66
67  /// Used by the ISel to turn in optimizations for POWER4-derived architectures
68  bool IsGigaProcessor;
69  bool Has64BitSupport;
70  bool Use64BitRegs;
71  bool IsPPC64;
72  bool HasAltivec;
73  bool HasFSQRT;
74  bool HasSTFIWX;
75  bool HasLazyResolverStubs;
76
77  /// DarwinVers - Nonzero if this is a darwin platform.  Otherwise, the numeric
78  /// version of the platform, e.g. 8 = 10.4 (Tiger), 9 = 10.5 (Leopard), etc.
79  unsigned char DarwinVers; // Is any darwin-ppc platform.
80public:
81  /// This constructor initializes the data members to match that
82  /// of the specified module.
83  ///
84  PPCSubtarget(const TargetMachine &TM, const Module &M,
85               const std::string &FS, bool is64Bit);
86
87  /// ParseSubtargetFeatures - Parses features string setting specified
88  /// subtarget options.  Definition of function is auto generated by tblgen.
89  void ParseSubtargetFeatures(const std::string &FS, const std::string &CPU);
90
91  /// SetJITMode - This is called to inform the subtarget info that we are
92  /// producing code for the JIT.
93  void SetJITMode();
94
95  /// getStackAlignment - Returns the minimum alignment known to hold of the
96  /// stack frame on entry to the function and which must be maintained by every
97  /// function for this subtarget.
98  unsigned getStackAlignment() const { return StackAlignment; }
99
100  /// getDarwinDirective - Returns the -m directive specified for the cpu.
101  ///
102  unsigned getDarwinDirective() const { return DarwinDirective; }
103
104  /// getInstrItins - Return the instruction itineraies based on subtarget
105  /// selection.
106  const InstrItineraryData &getInstrItineraryData() const { return InstrItins; }
107
108  /// getTargetDataString - Return the pointer size and type alignment
109  /// properties of this subtarget.
110  const char *getTargetDataString() const {
111    return isPPC64() ? "E-p:64:64-f64:32:64-i64:32:64-f128:64:128"
112                     : "E-p:32:32-f64:32:64-i64:32:64-f128:64:128";
113  }
114
115  /// isPPC64 - Return true if we are generating code for 64-bit pointer mode.
116  ///
117  bool isPPC64() const { return IsPPC64; }
118
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; }
122
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; }
127
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) const;
132
133  // Specific obvious features.
134  bool hasFSQRT() const { return HasFSQRT; }
135  bool hasSTFIWX() const { return HasSTFIWX; }
136  bool hasAltivec() const { return HasAltivec; }
137  bool isGigaProcessor() const { return IsGigaProcessor; }
138
139  /// isDarwin - True if this is any darwin platform.
140  bool isDarwin() const { return DarwinVers != 0; }
141  /// isDarwin - True if this is darwin9 (leopard, 10.5) or above.
142  bool isDarwin9() const { return DarwinVers >= 9; }
143
144  /// getDarwinVers - Return the darwin version number, 8 = tiger, 9 = leopard.
145  unsigned getDarwinVers() const { return DarwinVers; }
146
147  bool isMachoABI() const { return isDarwin() || IsPPC64; }
148  bool isELF32_ABI() const { return !isDarwin() && !IsPPC64; }
149
150  unsigned getAsmFlavor() const {
151    return AsmFlavor != Unset ? unsigned(AsmFlavor) : 0;
152  }
153};
154} // End llvm namespace
155
156#endif
157