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e73cf9a2 | 1 | /* Prototypes of memory model helper functions. |
85ec4feb | 2 | Copyright (C) 2011-2018 Free Software Foundation, Inc. |
e73cf9a2 TP |
3 | |
4 | This file is part of GCC. | |
5 | ||
6 | GCC is free software; you can redistribute it and/or modify it under | |
7 | the terms of the GNU General Public License as published by the Free | |
8 | Software Foundation; either version 3, or (at your option) any later | |
9 | version. | |
10 | ||
11 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
14 | for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GCC; see the file COPYING3. If not see | |
18 | <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #ifndef GCC_MEMMODEL_H | |
21 | #define GCC_MEMMODEL_H | |
22 | ||
4d0cdd0c TP |
23 | /* Suppose that higher bits are target dependent. */ |
24 | #define MEMMODEL_MASK ((1<<16)-1) | |
25 | ||
26 | /* Legacy sync operations set this upper flag in the memory model. This allows | |
27 | targets that need to do something stronger for sync operations to | |
28 | differentiate with their target patterns and issue a more appropriate insn | |
29 | sequence. See bugzilla 65697 for background. */ | |
30 | #define MEMMODEL_SYNC (1<<15) | |
31 | ||
32 | /* Memory model without SYNC bit for targets/operations that do not care. */ | |
33 | #define MEMMODEL_BASE_MASK (MEMMODEL_SYNC-1) | |
34 | ||
35 | /* Memory model types for the __atomic* builtins. | |
36 | This must match the order in libstdc++-v3/include/bits/atomic_base.h. */ | |
37 | enum memmodel | |
38 | { | |
39 | MEMMODEL_RELAXED = 0, | |
40 | MEMMODEL_CONSUME = 1, | |
41 | MEMMODEL_ACQUIRE = 2, | |
42 | MEMMODEL_RELEASE = 3, | |
43 | MEMMODEL_ACQ_REL = 4, | |
44 | MEMMODEL_SEQ_CST = 5, | |
45 | MEMMODEL_LAST = 6, | |
46 | MEMMODEL_SYNC_ACQUIRE = MEMMODEL_ACQUIRE | MEMMODEL_SYNC, | |
47 | MEMMODEL_SYNC_RELEASE = MEMMODEL_RELEASE | MEMMODEL_SYNC, | |
48 | MEMMODEL_SYNC_SEQ_CST = MEMMODEL_SEQ_CST | MEMMODEL_SYNC | |
49 | }; | |
50 | ||
e73cf9a2 TP |
51 | /* Return the memory model from a host integer. */ |
52 | static inline enum memmodel | |
53 | memmodel_from_int (unsigned HOST_WIDE_INT val) | |
54 | { | |
55 | return (enum memmodel) (val & MEMMODEL_MASK); | |
56 | } | |
57 | ||
58 | /* Return the base memory model from a host integer. */ | |
59 | static inline enum memmodel | |
60 | memmodel_base (unsigned HOST_WIDE_INT val) | |
61 | { | |
62 | return (enum memmodel) (val & MEMMODEL_BASE_MASK); | |
63 | } | |
64 | ||
65 | /* Return TRUE if the memory model is RELAXED. */ | |
66 | static inline bool | |
67 | is_mm_relaxed (enum memmodel model) | |
68 | { | |
69 | return (model & MEMMODEL_BASE_MASK) == MEMMODEL_RELAXED; | |
70 | } | |
71 | ||
72 | /* Return TRUE if the memory model is CONSUME. */ | |
73 | static inline bool | |
74 | is_mm_consume (enum memmodel model) | |
75 | { | |
76 | return (model & MEMMODEL_BASE_MASK) == MEMMODEL_CONSUME; | |
77 | } | |
78 | ||
79 | /* Return TRUE if the memory model is ACQUIRE. */ | |
80 | static inline bool | |
81 | is_mm_acquire (enum memmodel model) | |
82 | { | |
83 | return (model & MEMMODEL_BASE_MASK) == MEMMODEL_ACQUIRE; | |
84 | } | |
85 | ||
86 | /* Return TRUE if the memory model is RELEASE. */ | |
87 | static inline bool | |
88 | is_mm_release (enum memmodel model) | |
89 | { | |
90 | return (model & MEMMODEL_BASE_MASK) == MEMMODEL_RELEASE; | |
91 | } | |
92 | ||
93 | /* Return TRUE if the memory model is ACQ_REL. */ | |
94 | static inline bool | |
95 | is_mm_acq_rel (enum memmodel model) | |
96 | { | |
97 | return (model & MEMMODEL_BASE_MASK) == MEMMODEL_ACQ_REL; | |
98 | } | |
99 | ||
100 | /* Return TRUE if the memory model is SEQ_CST. */ | |
101 | static inline bool | |
102 | is_mm_seq_cst (enum memmodel model) | |
103 | { | |
104 | return (model & MEMMODEL_BASE_MASK) == MEMMODEL_SEQ_CST; | |
105 | } | |
106 | ||
107 | /* Return TRUE if the memory model is a SYNC variant. */ | |
108 | static inline bool | |
109 | is_mm_sync (enum memmodel model) | |
110 | { | |
111 | return (model & MEMMODEL_SYNC); | |
112 | } | |
113 | ||
114 | #endif /* GCC_MEMMODEL_H */ |