Mercurial > hg > CbC > CbC_gcc

comparison libgomp/config/linux/bar.h @ 111:04ced10e8804

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
parents a06113de4d67
children 84e7813d76e9
comparison
equal deleted inserted replaced
68:561a7518be6b 111:04ced10e8804
1 /* Copyright (C) 2005, 2008, 2009 Free Software Foundation, Inc. 1 /* Copyright (C) 2005-2017 Free Software Foundation, Inc.
2 Contributed by Richard Henderson <rth@redhat.com>. 2 Contributed by Richard Henderson <rth@redhat.com>.
3 3
4 This file is part of the GNU OpenMP Library (libgomp). 4 This file is part of the GNU Offloading and Multi Processing Library
5 (libgomp).
5 6
6 Libgomp is free software; you can redistribute it and/or modify it 7 Libgomp is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by 8 under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3, or (at your option) 9 the Free Software Foundation; either version 3, or (at your option)
9 any later version. 10 any later version.
36 /* Make sure total/generation is in a mostly read cacheline, while 37 /* Make sure total/generation is in a mostly read cacheline, while
37 awaited in a separate cacheline. */ 38 awaited in a separate cacheline. */
38 unsigned total __attribute__((aligned (64))); 39 unsigned total __attribute__((aligned (64)));
39 unsigned generation; 40 unsigned generation;
40 unsigned awaited __attribute__((aligned (64))); 41 unsigned awaited __attribute__((aligned (64)));
42 unsigned awaited_final;
41 } gomp_barrier_t; 43 } gomp_barrier_t;
44
42 typedef unsigned int gomp_barrier_state_t; 45 typedef unsigned int gomp_barrier_state_t;
46
47 /* The generation field contains a counter in the high bits, with a few
48 low bits dedicated to flags. Note that TASK_PENDING and WAS_LAST can
49 share space because WAS_LAST is never stored back to generation. */
50 #define BAR_TASK_PENDING 1
51 #define BAR_WAS_LAST 1
52 #define BAR_WAITING_FOR_TASK 2
53 #define BAR_CANCELLED 4
54 #define BAR_INCR 8
43 55
44 static inline void gomp_barrier_init (gomp_barrier_t *bar, unsigned count) 56 static inline void gomp_barrier_init (gomp_barrier_t *bar, unsigned count)
45 { 57 {
46 bar->total = count; 58 bar->total = count;
47 bar->awaited = count; 59 bar->awaited = count;
60 bar->awaited_final = count;
48 bar->generation = 0; 61 bar->generation = 0;
49 } 62 }
50 63
51 static inline void gomp_barrier_reinit (gomp_barrier_t *bar, unsigned count) 64 static inline void gomp_barrier_reinit (gomp_barrier_t *bar, unsigned count)
52 { 65 {
53 __sync_fetch_and_add (&bar->awaited, count - bar->total); 66 __atomic_add_fetch (&bar->awaited, count - bar->total, MEMMODEL_ACQ_REL);
54 bar->total = count; 67 bar->total = count;
55 } 68 }
56 69
57 static inline void gomp_barrier_destroy (gomp_barrier_t *bar) 70 static inline void gomp_barrier_destroy (gomp_barrier_t *bar)
58 { 71 {
60 73
61 extern void gomp_barrier_wait (gomp_barrier_t *); 74 extern void gomp_barrier_wait (gomp_barrier_t *);
62 extern void gomp_barrier_wait_last (gomp_barrier_t *); 75 extern void gomp_barrier_wait_last (gomp_barrier_t *);
63 extern void gomp_barrier_wait_end (gomp_barrier_t *, gomp_barrier_state_t); 76 extern void gomp_barrier_wait_end (gomp_barrier_t *, gomp_barrier_state_t);
64 extern void gomp_team_barrier_wait (gomp_barrier_t *); 77 extern void gomp_team_barrier_wait (gomp_barrier_t *);
78 extern void gomp_team_barrier_wait_final (gomp_barrier_t *);
65 extern void gomp_team_barrier_wait_end (gomp_barrier_t *, 79 extern void gomp_team_barrier_wait_end (gomp_barrier_t *,
66 gomp_barrier_state_t); 80 gomp_barrier_state_t);
81 extern bool gomp_team_barrier_wait_cancel (gomp_barrier_t *);
82 extern bool gomp_team_barrier_wait_cancel_end (gomp_barrier_t *,
83 gomp_barrier_state_t);
67 extern void gomp_team_barrier_wake (gomp_barrier_t *, int); 84 extern void gomp_team_barrier_wake (gomp_barrier_t *, int);
85 struct gomp_team;
86 extern void gomp_team_barrier_cancel (struct gomp_team *);
68 87
69 static inline gomp_barrier_state_t 88 static inline gomp_barrier_state_t
70 gomp_barrier_wait_start (gomp_barrier_t *bar) 89 gomp_barrier_wait_start (gomp_barrier_t *bar)
71 { 90 {
72 unsigned int ret = bar->generation & ~3; 91 unsigned int ret = __atomic_load_n (&bar->generation, MEMMODEL_ACQUIRE);
73 /* Do we need any barrier here or is __sync_add_and_fetch acting 92 ret &= -BAR_INCR | BAR_CANCELLED;
74 as the needed LoadLoad barrier already? */ 93 /* A memory barrier is needed before exiting from the various forms
75 ret += __sync_add_and_fetch (&bar->awaited, -1) == 0; 94 of gomp_barrier_wait, to satisfy OpenMP API version 3.1 section
95 2.8.6 flush Construct, which says there is an implicit flush during
96 a barrier region. This is a convenient place to add the barrier,
97 so we use MEMMODEL_ACQ_REL here rather than MEMMODEL_ACQUIRE. */
98 if (__atomic_add_fetch (&bar->awaited, -1, MEMMODEL_ACQ_REL) == 0)
99 ret |= BAR_WAS_LAST;
100 return ret;
101 }
102
103 static inline gomp_barrier_state_t
104 gomp_barrier_wait_cancel_start (gomp_barrier_t *bar)
105 {
106 return gomp_barrier_wait_start (bar);
107 }
108
109 /* This is like gomp_barrier_wait_start, except it decrements
110 bar->awaited_final rather than bar->awaited and should be used
111 for the gomp_team_end barrier only. */
112 static inline gomp_barrier_state_t
113 gomp_barrier_wait_final_start (gomp_barrier_t *bar)
114 {
115 unsigned int ret = __atomic_load_n (&bar->generation, MEMMODEL_ACQUIRE);
116 ret &= -BAR_INCR | BAR_CANCELLED;
117 /* See above gomp_barrier_wait_start comment. */
118 if (__atomic_add_fetch (&bar->awaited_final, -1, MEMMODEL_ACQ_REL) == 0)
119 ret |= BAR_WAS_LAST;
76 return ret; 120 return ret;
77 } 121 }
78 122
79 static inline bool 123 static inline bool
80 gomp_barrier_last_thread (gomp_barrier_state_t state) 124 gomp_barrier_last_thread (gomp_barrier_state_t state)
81 { 125 {
82 return state & 1; 126 return state & BAR_WAS_LAST;
83 } 127 }
84 128
85 /* All the inlines below must be called with team->task_lock 129 /* All the inlines below must be called with team->task_lock
86 held. */ 130 held. */
87 131
88 static inline void 132 static inline void
89 gomp_team_barrier_set_task_pending (gomp_barrier_t *bar) 133 gomp_team_barrier_set_task_pending (gomp_barrier_t *bar)
90 { 134 {
91 bar->generation |= 1; 135 bar->generation |= BAR_TASK_PENDING;
92 } 136 }
93 137
94 static inline void 138 static inline void
95 gomp_team_barrier_clear_task_pending (gomp_barrier_t *bar) 139 gomp_team_barrier_clear_task_pending (gomp_barrier_t *bar)
96 { 140 {
97 bar->generation &= ~1; 141 bar->generation &= ~BAR_TASK_PENDING;
98 } 142 }
99 143
100 static inline void 144 static inline void
101 gomp_team_barrier_set_waiting_for_tasks (gomp_barrier_t *bar) 145 gomp_team_barrier_set_waiting_for_tasks (gomp_barrier_t *bar)
102 { 146 {
103 bar->generation |= 2; 147 bar->generation |= BAR_WAITING_FOR_TASK;
104 } 148 }
105 149
106 static inline bool 150 static inline bool
107 gomp_team_barrier_waiting_for_tasks (gomp_barrier_t *bar) 151 gomp_team_barrier_waiting_for_tasks (gomp_barrier_t *bar)
108 { 152 {
109 return (bar->generation & 2) != 0; 153 return (bar->generation & BAR_WAITING_FOR_TASK) != 0;
154 }
155
156 static inline bool
157 gomp_team_barrier_cancelled (gomp_barrier_t *bar)
158 {
159 return __builtin_expect ((bar->generation & BAR_CANCELLED) != 0, 0);
110 } 160 }
111 161
112 static inline void 162 static inline void
113 gomp_team_barrier_done (gomp_barrier_t *bar, gomp_barrier_state_t state) 163 gomp_team_barrier_done (gomp_barrier_t *bar, gomp_barrier_state_t state)
114 { 164 {
115 bar->generation = (state & ~3) + 4; 165 bar->generation = (state & -BAR_INCR) + BAR_INCR;
116 } 166 }
117 167
118 #endif /* GOMP_BARRIER_H */ 168 #endif /* GOMP_BARRIER_H */