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111
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1 /* Prototypes of memory model helper functions.
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2 Copyright (C) 2011-2017 Free Software Foundation, Inc.
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify it under
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7 the terms of the GNU General Public License as published by the Free
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8 Software Foundation; either version 3, or (at your option) any later
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9 version.
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10
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11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with GCC; see the file COPYING3. If not see
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18 <http://www.gnu.org/licenses/>. */
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19
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20 #ifndef GCC_MEMMODEL_H
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21 #define GCC_MEMMODEL_H
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22
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23 /* Suppose that higher bits are target dependent. */
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24 #define MEMMODEL_MASK ((1<<16)-1)
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25
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26 /* Legacy sync operations set this upper flag in the memory model. This allows
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27 targets that need to do something stronger for sync operations to
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28 differentiate with their target patterns and issue a more appropriate insn
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29 sequence. See bugzilla 65697 for background. */
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30 #define MEMMODEL_SYNC (1<<15)
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31
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32 /* Memory model without SYNC bit for targets/operations that do not care. */
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33 #define MEMMODEL_BASE_MASK (MEMMODEL_SYNC-1)
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34
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35 /* Memory model types for the __atomic* builtins.
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36 This must match the order in libstdc++-v3/include/bits/atomic_base.h. */
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37 enum memmodel
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38 {
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39 MEMMODEL_RELAXED = 0,
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40 MEMMODEL_CONSUME = 1,
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41 MEMMODEL_ACQUIRE = 2,
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42 MEMMODEL_RELEASE = 3,
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43 MEMMODEL_ACQ_REL = 4,
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44 MEMMODEL_SEQ_CST = 5,
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45 MEMMODEL_LAST = 6,
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46 MEMMODEL_SYNC_ACQUIRE = MEMMODEL_ACQUIRE | MEMMODEL_SYNC,
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47 MEMMODEL_SYNC_RELEASE = MEMMODEL_RELEASE | MEMMODEL_SYNC,
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48 MEMMODEL_SYNC_SEQ_CST = MEMMODEL_SEQ_CST | MEMMODEL_SYNC
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49 };
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50
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51 /* Return the memory model from a host integer. */
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52 static inline enum memmodel
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53 memmodel_from_int (unsigned HOST_WIDE_INT val)
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54 {
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55 return (enum memmodel) (val & MEMMODEL_MASK);
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56 }
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57
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58 /* Return the base memory model from a host integer. */
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59 static inline enum memmodel
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60 memmodel_base (unsigned HOST_WIDE_INT val)
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61 {
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62 return (enum memmodel) (val & MEMMODEL_BASE_MASK);
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63 }
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64
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65 /* Return TRUE if the memory model is RELAXED. */
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66 static inline bool
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67 is_mm_relaxed (enum memmodel model)
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68 {
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69 return (model & MEMMODEL_BASE_MASK) == MEMMODEL_RELAXED;
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70 }
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71
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72 /* Return TRUE if the memory model is CONSUME. */
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73 static inline bool
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74 is_mm_consume (enum memmodel model)
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75 {
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76 return (model & MEMMODEL_BASE_MASK) == MEMMODEL_CONSUME;
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77 }
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78
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79 /* Return TRUE if the memory model is ACQUIRE. */
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80 static inline bool
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81 is_mm_acquire (enum memmodel model)
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82 {
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83 return (model & MEMMODEL_BASE_MASK) == MEMMODEL_ACQUIRE;
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84 }
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85
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86 /* Return TRUE if the memory model is RELEASE. */
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87 static inline bool
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88 is_mm_release (enum memmodel model)
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89 {
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90 return (model & MEMMODEL_BASE_MASK) == MEMMODEL_RELEASE;
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91 }
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92
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93 /* Return TRUE if the memory model is ACQ_REL. */
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94 static inline bool
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95 is_mm_acq_rel (enum memmodel model)
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96 {
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97 return (model & MEMMODEL_BASE_MASK) == MEMMODEL_ACQ_REL;
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98 }
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99
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100 /* Return TRUE if the memory model is SEQ_CST. */
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101 static inline bool
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102 is_mm_seq_cst (enum memmodel model)
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103 {
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104 return (model & MEMMODEL_BASE_MASK) == MEMMODEL_SEQ_CST;
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105 }
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106
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107 /* Return TRUE if the memory model is a SYNC variant. */
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108 static inline bool
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109 is_mm_sync (enum memmodel model)
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110 {
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111 return (model & MEMMODEL_SYNC);
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112 }
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113
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114 #endif /* GCC_MEMMODEL_H */
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