ARMSubtarget.h revision 194178 
1//=====---- ARMSubtarget.h - Define Subtarget for the ARM -----*- 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 ARM specific subclass of TargetSubtarget.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef ARMSUBTARGET_H
15#define ARMSUBTARGET_H
16
17#include "llvm/Target/TargetSubtarget.h"
18#include <string>
19
20namespace llvm {
21class Module;
22
23class ARMSubtarget : public TargetSubtarget {
24protected:
25  enum ARMArchEnum {
26    V4T, V5T, V5TE, V6, V6T2, V7A
27  };
28
29  enum ARMFPEnum {
30    None, VFPv2, VFPv3, NEON
31  };
32
33  enum ThumbTypeEnum {
34    Thumb1,
35    Thumb2
36  };
37
38  /// ARMArchVersion - ARM architecture version: V4T (base), V5T, V5TE,
39  /// V6, V6T2, V7A.
40  ARMArchEnum ARMArchVersion;
41
42  /// ARMFPUType - Floating Point Unit type.
43  ARMFPEnum ARMFPUType;
44
45  /// IsThumb - True if we are in thumb mode, false if in ARM mode.
46  bool IsThumb;
47
48  /// ThumbMode - Indicates supported Thumb version.
49  ThumbTypeEnum ThumbMode;
50
51  /// UseThumbBacktraces - True if we use thumb style backtraces.
52  bool UseThumbBacktraces;
53
54  /// IsR9Reserved - True if R9 is a not available as general purpose register.
55  bool IsR9Reserved;
56
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  /// CPUString - String name of used CPU.
62  std::string CPUString;
63
64 public:
65  enum {
66    isELF, isDarwin
67  } TargetType;
68
69  enum {
70    ARM_ABI_APCS,
71    ARM_ABI_AAPCS // ARM EABI
72  } TargetABI;
73
74  /// This constructor initializes the data members to match that
75  /// of the specified module.
76  ///
77  ARMSubtarget(const Module &M, const std::string &FS, bool isThumb);
78
79  /// getMaxInlineSizeThreshold - Returns the maximum memset / memcpy size
80  /// that still makes it profitable to inline the call.
81  unsigned getMaxInlineSizeThreshold() const {
82    // FIXME: For now, we don't lower memcpy's to loads / stores for Thumb.
83    // Change this once Thumb ldmia / stmia support is added.
84    return isThumb() ? 0 : 64;
85  }
86  /// ParseSubtargetFeatures - Parses features string setting specified
87  /// subtarget options.  Definition of function is auto generated by tblgen.
88  std::string ParseSubtargetFeatures(const std::string &FS,
89                                     const std::string &CPU);
90
91  bool hasV4TOps()  const { return ARMArchVersion >= V4T;  }
92  bool hasV5TOps()  const { return ARMArchVersion >= V5T;  }
93  bool hasV5TEOps() const { return ARMArchVersion >= V5TE; }
94  bool hasV6Ops()   const { return ARMArchVersion >= V6;   }
95  bool hasV6T2Ops() const { return ARMArchVersion >= V6T2; }
96  bool hasV7Ops()   const { return ARMArchVersion >= V7A;  }
97
98  bool hasVFP2() const { return ARMFPUType >= VFPv2; }
99  bool hasVFP3() const { return ARMFPUType >= VFPv3; }
100  bool hasNEON() const { return ARMFPUType >= NEON;  }
101
102  bool isTargetDarwin() const { return TargetType == isDarwin; }
103  bool isTargetELF() const { return TargetType == isELF; }
104
105  bool isAPCS_ABI() const { return TargetABI == ARM_ABI_APCS; }
106  bool isAAPCS_ABI() const { return TargetABI == ARM_ABI_AAPCS; }
107
108  bool isThumb() const { return IsThumb; }
109  bool isThumb1() const { return IsThumb && (ThumbMode == Thumb1); }
110  bool isThumb2() const { return IsThumb && (ThumbMode >= Thumb2); }
111
112  bool useThumbBacktraces() const { return UseThumbBacktraces; }
113  bool isR9Reserved() const { return IsR9Reserved; }
114
115  const std::string & getCPUString() const { return CPUString; }
116
117  /// getStackAlignment - Returns the minimum alignment known to hold of the
118  /// stack frame on entry to the function and which must be maintained by every
119  /// function for this subtarget.
120  unsigned getStackAlignment() const { return stackAlignment; }
121};
122} // End llvm namespace
123
124#endif  // ARMSUBTARGET_H
125