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/Target/TargetSubtargetInfo.h"
18#include "llvm/MC/MCInstrItineraries.h"
19#include "llvm/ADT/Triple.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_PWR6,
47    DIR_PWR7,
48    DIR_64
49  };
50}
51
52class GlobalValue;
53class TargetMachine;
54
55class PPCSubtarget : public PPCGenSubtargetInfo {
56protected:
57  /// stackAlignment - The minimum alignment known to hold of the stack frame on
58  /// entry to the function and which must be maintained by every function.
59  unsigned StackAlignment;
60
61  /// Selected instruction itineraries (one entry per itinerary class.)
62  InstrItineraryData InstrItins;
63
64  /// Which cpu directive was used.
65  unsigned DarwinDirective;
66
67  /// Used by the ISel to turn in optimizations for POWER4-derived architectures
68  bool HasMFOCRF;
69  bool Has64BitSupport;
70  bool Use64BitRegs;
71  bool IsPPC64;
72  bool HasAltivec;
73  bool HasFSQRT;
74  bool HasSTFIWX;
75  bool HasISEL;
76  bool IsBookE;
77  bool HasLazyResolverStubs;
78  bool IsJITCodeModel;
79
80  /// TargetTriple - What processor and OS we're targeting.
81  Triple TargetTriple;
82
83public:
84  /// This constructor initializes the data members to match that
85  /// of the specified triple.
86  ///
87  PPCSubtarget(const std::string &TT, const std::string &CPU,
88               const std::string &FS, bool is64Bit);
89
90  /// ParseSubtargetFeatures - Parses features string setting specified
91  /// subtarget options.  Definition of function is auto generated by tblgen.
92  void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
93
94  /// SetJITMode - This is called to inform the subtarget info that we are
95  /// producing code for the JIT.
96  void SetJITMode();
97
98  /// getStackAlignment - Returns the minimum alignment known to hold of the
99  /// stack frame on entry to the function and which must be maintained by every
100  /// function for this subtarget.
101  unsigned getStackAlignment() const { return StackAlignment; }
102
103  /// getDarwinDirective - Returns the -m directive specified for the cpu.
104  ///
105  unsigned getDarwinDirective() const { return DarwinDirective; }
106
107  /// getInstrItins - Return the instruction itineraies based on subtarget
108  /// selection.
109  const InstrItineraryData &getInstrItineraryData() const { return InstrItins; }
110
111  /// getTargetDataString - Return the pointer size and type alignment
112  /// properties of this subtarget.
113  const char *getTargetDataString() const {
114    // Note, the alignment values for f64 and i64 on ppc64 in Darwin
115    // documentation are wrong; these are correct (i.e. "what gcc does").
116    return isPPC64() ? "E-p:64:64-f64:64:64-i64:64:64-f128:64:128-n32:64"
117                     : "E-p:32:32-f64:64:64-i64:64:64-f128:64:128-n32";
118  }
119
120  /// isPPC64 - Return true if we are generating code for 64-bit pointer mode.
121  ///
122  bool isPPC64() const { return IsPPC64; }
123
124  /// has64BitSupport - Return true if the selected CPU supports 64-bit
125  /// instructions, regardless of whether we are in 32-bit or 64-bit mode.
126  bool has64BitSupport() const { return Has64BitSupport; }
127
128  /// use64BitRegs - Return true if in 64-bit mode or if we should use 64-bit
129  /// registers in 32-bit mode when possible.  This can only true if
130  /// has64BitSupport() returns true.
131  bool use64BitRegs() const { return Use64BitRegs; }
132
133  /// hasLazyResolverStub - Return true if accesses to the specified global have
134  /// to go through a dyld lazy resolution stub.  This means that an extra load
135  /// is required to get the address of the global.
136  bool hasLazyResolverStub(const GlobalValue *GV,
137                           const TargetMachine &TM) const;
138
139  // isJITCodeModel - True if we're generating code for the JIT
140  bool isJITCodeModel() const { return IsJITCodeModel; }
141
142  // Specific obvious features.
143  bool hasFSQRT() const { return HasFSQRT; }
144  bool hasSTFIWX() const { return HasSTFIWX; }
145  bool hasAltivec() const { return HasAltivec; }
146  bool hasMFOCRF() const { return HasMFOCRF; }
147  bool hasISEL() const { return HasISEL; }
148  bool isBookE() const { return IsBookE; }
149
150  const Triple &getTargetTriple() const { return TargetTriple; }
151
152  /// isDarwin - True if this is any darwin platform.
153  bool isDarwin() const { return TargetTriple.isMacOSX(); }
154  /// isBGP - True if this is a BG/P platform.
155  bool isBGP() const { return TargetTriple.getVendor() == Triple::BGP; }
156
157  bool isDarwinABI() const { return isDarwin(); }
158  bool isSVR4ABI() const { return !isDarwin(); }
159
160  /// enablePostRAScheduler - True at 'More' optimization.
161  bool enablePostRAScheduler(CodeGenOpt::Level OptLevel,
162                             TargetSubtargetInfo::AntiDepBreakMode& Mode,
163                             RegClassVector& CriticalPathRCs) const;
164};
165} // End llvm namespace
166
167#endif
168