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1 /* Copyright (C) 2005, 2008, 2009 Free Software Foundation, Inc.
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2 Contributed by Richard Henderson <rth@redhat.com>.
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3
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4 This file is part of the GNU OpenMP Library (libgomp).
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5
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6 Libgomp is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 3, or (at your option)
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9 any later version.
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10
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11 Libgomp 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 FITNESS
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13 FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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14 more details.
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15
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16 Under Section 7 of GPL version 3, you are granted additional
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17 permissions described in the GCC Runtime Library Exception, version
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18 3.1, as published by the Free Software Foundation.
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19
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20 You should have received a copy of the GNU General Public License and
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21 a copy of the GCC Runtime Library Exception along with this program;
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22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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23 <http://www.gnu.org/licenses/>. */
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24
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25 /* This file handles the LOOP (FOR/DO) construct. */
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26
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27 #include <limits.h>
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28 #include <stdlib.h>
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29 #include "libgomp.h"
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30
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31
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32 /* Initialize the given work share construct from the given arguments. */
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33
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34 static inline void
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35 gomp_loop_init (struct gomp_work_share *ws, long start, long end, long incr,
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36 enum gomp_schedule_type sched, long chunk_size)
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37 {
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38 ws->sched = sched;
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39 ws->chunk_size = chunk_size;
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40 /* Canonicalize loops that have zero iterations to ->next == ->end. */
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41 ws->end = ((incr > 0 && start > end) || (incr < 0 && start < end))
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42 ? start : end;
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43 ws->incr = incr;
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44 ws->next = start;
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45 if (sched == GFS_DYNAMIC)
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46 {
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47 ws->chunk_size *= incr;
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48
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49 #ifdef HAVE_SYNC_BUILTINS
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50 {
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51 /* For dynamic scheduling prepare things to make each iteration
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52 faster. */
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53 struct gomp_thread *thr = gomp_thread ();
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54 struct gomp_team *team = thr->ts.team;
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55 long nthreads = team ? team->nthreads : 1;
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56
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57 if (__builtin_expect (incr > 0, 1))
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58 {
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59 /* Cheap overflow protection. */
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60 if (__builtin_expect ((nthreads | ws->chunk_size)
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61 >= 1UL << (sizeof (long)
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62 * __CHAR_BIT__ / 2 - 1), 0))
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63 ws->mode = 0;
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64 else
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65 ws->mode = ws->end < (LONG_MAX
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66 - (nthreads + 1) * ws->chunk_size);
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67 }
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68 /* Cheap overflow protection. */
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69 else if (__builtin_expect ((nthreads | -ws->chunk_size)
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70 >= 1UL << (sizeof (long)
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71 * __CHAR_BIT__ / 2 - 1), 0))
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72 ws->mode = 0;
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73 else
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74 ws->mode = ws->end > (nthreads + 1) * -ws->chunk_size - LONG_MAX;
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75 }
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76 #endif
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77 }
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78 }
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79
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80 /* The *_start routines are called when first encountering a loop construct
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81 that is not bound directly to a parallel construct. The first thread
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82 that arrives will create the work-share construct; subsequent threads
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83 will see the construct exists and allocate work from it.
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84
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85 START, END, INCR are the bounds of the loop; due to the restrictions of
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86 OpenMP, these values must be the same in every thread. This is not
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87 verified (nor is it entirely verifiable, since START is not necessarily
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88 retained intact in the work-share data structure). CHUNK_SIZE is the
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89 scheduling parameter; again this must be identical in all threads.
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90
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91 Returns true if there's any work for this thread to perform. If so,
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92 *ISTART and *IEND are filled with the bounds of the iteration block
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93 allocated to this thread. Returns false if all work was assigned to
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94 other threads prior to this thread's arrival. */
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95
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96 static bool
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97 gomp_loop_static_start (long start, long end, long incr, long chunk_size,
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98 long *istart, long *iend)
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99 {
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100 struct gomp_thread *thr = gomp_thread ();
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101
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102 thr->ts.static_trip = 0;
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103 if (gomp_work_share_start (false))
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104 {
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105 gomp_loop_init (thr->ts.work_share, start, end, incr,
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106 GFS_STATIC, chunk_size);
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107 gomp_work_share_init_done ();
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108 }
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109
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110 return !gomp_iter_static_next (istart, iend);
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111 }
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112
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113 static bool
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114 gomp_loop_dynamic_start (long start, long end, long incr, long chunk_size,
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115 long *istart, long *iend)
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116 {
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117 struct gomp_thread *thr = gomp_thread ();
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118 bool ret;
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119
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120 if (gomp_work_share_start (false))
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121 {
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122 gomp_loop_init (thr->ts.work_share, start, end, incr,
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123 GFS_DYNAMIC, chunk_size);
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124 gomp_work_share_init_done ();
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125 }
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126
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127 #ifdef HAVE_SYNC_BUILTINS
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128 ret = gomp_iter_dynamic_next (istart, iend);
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129 #else
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130 gomp_mutex_lock (&thr->ts.work_share->lock);
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131 ret = gomp_iter_dynamic_next_locked (istart, iend);
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132 gomp_mutex_unlock (&thr->ts.work_share->lock);
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133 #endif
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134
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135 return ret;
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136 }
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137
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138 static bool
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139 gomp_loop_guided_start (long start, long end, long incr, long chunk_size,
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140 long *istart, long *iend)
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141 {
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142 struct gomp_thread *thr = gomp_thread ();
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143 bool ret;
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144
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145 if (gomp_work_share_start (false))
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146 {
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147 gomp_loop_init (thr->ts.work_share, start, end, incr,
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148 GFS_GUIDED, chunk_size);
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149 gomp_work_share_init_done ();
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150 }
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151
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152 #ifdef HAVE_SYNC_BUILTINS
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153 ret = gomp_iter_guided_next (istart, iend);
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154 #else
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155 gomp_mutex_lock (&thr->ts.work_share->lock);
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156 ret = gomp_iter_guided_next_locked (istart, iend);
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157 gomp_mutex_unlock (&thr->ts.work_share->lock);
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158 #endif
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159
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160 return ret;
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161 }
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162
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163 bool
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164 GOMP_loop_runtime_start (long start, long end, long incr,
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165 long *istart, long *iend)
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166 {
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167 struct gomp_task_icv *icv = gomp_icv (false);
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168 switch (icv->run_sched_var)
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169 {
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170 case GFS_STATIC:
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171 return gomp_loop_static_start (start, end, incr, icv->run_sched_modifier,
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172 istart, iend);
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173 case GFS_DYNAMIC:
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174 return gomp_loop_dynamic_start (start, end, incr, icv->run_sched_modifier,
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175 istart, iend);
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176 case GFS_GUIDED:
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177 return gomp_loop_guided_start (start, end, incr, icv->run_sched_modifier,
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178 istart, iend);
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179 case GFS_AUTO:
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180 /* For now map to schedule(static), later on we could play with feedback
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181 driven choice. */
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182 return gomp_loop_static_start (start, end, incr, 0, istart, iend);
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183 default:
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184 abort ();
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185 }
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186 }
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187
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188 /* The *_ordered_*_start routines are similar. The only difference is that
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189 this work-share construct is initialized to expect an ORDERED section. */
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190
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191 static bool
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192 gomp_loop_ordered_static_start (long start, long end, long incr,
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193 long chunk_size, long *istart, long *iend)
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194 {
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195 struct gomp_thread *thr = gomp_thread ();
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196
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197 thr->ts.static_trip = 0;
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198 if (gomp_work_share_start (true))
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199 {
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200 gomp_loop_init (thr->ts.work_share, start, end, incr,
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201 GFS_STATIC, chunk_size);
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202 gomp_ordered_static_init ();
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203 gomp_work_share_init_done ();
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204 }
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205
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206 return !gomp_iter_static_next (istart, iend);
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207 }
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208
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209 static bool
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210 gomp_loop_ordered_dynamic_start (long start, long end, long incr,
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211 long chunk_size, long *istart, long *iend)
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212 {
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213 struct gomp_thread *thr = gomp_thread ();
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214 bool ret;
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215
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216 if (gomp_work_share_start (true))
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217 {
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218 gomp_loop_init (thr->ts.work_share, start, end, incr,
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219 GFS_DYNAMIC, chunk_size);
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220 gomp_mutex_lock (&thr->ts.work_share->lock);
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221 gomp_work_share_init_done ();
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222 }
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223 else
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224 gomp_mutex_lock (&thr->ts.work_share->lock);
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225
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226 ret = gomp_iter_dynamic_next_locked (istart, iend);
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227 if (ret)
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228 gomp_ordered_first ();
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229 gomp_mutex_unlock (&thr->ts.work_share->lock);
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230
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231 return ret;
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232 }
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233
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234 static bool
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235 gomp_loop_ordered_guided_start (long start, long end, long incr,
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236 long chunk_size, long *istart, long *iend)
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237 {
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238 struct gomp_thread *thr = gomp_thread ();
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239 bool ret;
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240
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241 if (gomp_work_share_start (true))
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242 {
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243 gomp_loop_init (thr->ts.work_share, start, end, incr,
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244 GFS_GUIDED, chunk_size);
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245 gomp_mutex_lock (&thr->ts.work_share->lock);
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246 gomp_work_share_init_done ();
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247 }
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248 else
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249 gomp_mutex_lock (&thr->ts.work_share->lock);
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250
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251 ret = gomp_iter_guided_next_locked (istart, iend);
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252 if (ret)
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253 gomp_ordered_first ();
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254 gomp_mutex_unlock (&thr->ts.work_share->lock);
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255
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256 return ret;
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257 }
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258
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259 bool
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260 GOMP_loop_ordered_runtime_start (long start, long end, long incr,
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261 long *istart, long *iend)
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262 {
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263 struct gomp_task_icv *icv = gomp_icv (false);
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264 switch (icv->run_sched_var)
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265 {
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266 case GFS_STATIC:
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267 return gomp_loop_ordered_static_start (start, end, incr,
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268 icv->run_sched_modifier,
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269 istart, iend);
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270 case GFS_DYNAMIC:
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271 return gomp_loop_ordered_dynamic_start (start, end, incr,
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272 icv->run_sched_modifier,
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273 istart, iend);
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274 case GFS_GUIDED:
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275 return gomp_loop_ordered_guided_start (start, end, incr,
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276 icv->run_sched_modifier,
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277 istart, iend);
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278 case GFS_AUTO:
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279 /* For now map to schedule(static), later on we could play with feedback
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280 driven choice. */
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281 return gomp_loop_ordered_static_start (start, end, incr,
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282 0, istart, iend);
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283 default:
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284 abort ();
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285 }
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286 }
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287
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288 /* The *_next routines are called when the thread completes processing of
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289 the iteration block currently assigned to it. If the work-share
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290 construct is bound directly to a parallel construct, then the iteration
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291 bounds may have been set up before the parallel. In which case, this
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292 may be the first iteration for the thread.
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293
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294 Returns true if there is work remaining to be performed; *ISTART and
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295 *IEND are filled with a new iteration block. Returns false if all work
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296 has been assigned. */
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297
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298 static bool
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299 gomp_loop_static_next (long *istart, long *iend)
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300 {
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301 return !gomp_iter_static_next (istart, iend);
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302 }
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303
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304 static bool
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305 gomp_loop_dynamic_next (long *istart, long *iend)
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306 {
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307 bool ret;
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308
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309 #ifdef HAVE_SYNC_BUILTINS
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310 ret = gomp_iter_dynamic_next (istart, iend);
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311 #else
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312 struct gomp_thread *thr = gomp_thread ();
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313 gomp_mutex_lock (&thr->ts.work_share->lock);
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314 ret = gomp_iter_dynamic_next_locked (istart, iend);
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315 gomp_mutex_unlock (&thr->ts.work_share->lock);
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316 #endif
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317
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318 return ret;
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319 }
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320
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321 static bool
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322 gomp_loop_guided_next (long *istart, long *iend)
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323 {
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324 bool ret;
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325
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326 #ifdef HAVE_SYNC_BUILTINS
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327 ret = gomp_iter_guided_next (istart, iend);
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328 #else
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329 struct gomp_thread *thr = gomp_thread ();
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330 gomp_mutex_lock (&thr->ts.work_share->lock);
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331 ret = gomp_iter_guided_next_locked (istart, iend);
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332 gomp_mutex_unlock (&thr->ts.work_share->lock);
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333 #endif
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334
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335 return ret;
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336 }
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337
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338 bool
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339 GOMP_loop_runtime_next (long *istart, long *iend)
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340 {
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341 struct gomp_thread *thr = gomp_thread ();
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342
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343 switch (thr->ts.work_share->sched)
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344 {
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345 case GFS_STATIC:
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346 case GFS_AUTO:
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347 return gomp_loop_static_next (istart, iend);
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348 case GFS_DYNAMIC:
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349 return gomp_loop_dynamic_next (istart, iend);
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350 case GFS_GUIDED:
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351 return gomp_loop_guided_next (istart, iend);
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352 default:
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353 abort ();
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354 }
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355 }
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356
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357 /* The *_ordered_*_next routines are called when the thread completes
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358 processing of the iteration block currently assigned to it.
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359
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360 Returns true if there is work remaining to be performed; *ISTART and
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361 *IEND are filled with a new iteration block. Returns false if all work
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362 has been assigned. */
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363
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364 static bool
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365 gomp_loop_ordered_static_next (long *istart, long *iend)
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366 {
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367 struct gomp_thread *thr = gomp_thread ();
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368 int test;
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369
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370 gomp_ordered_sync ();
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371 gomp_mutex_lock (&thr->ts.work_share->lock);
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372 test = gomp_iter_static_next (istart, iend);
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373 if (test >= 0)
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374 gomp_ordered_static_next ();
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375 gomp_mutex_unlock (&thr->ts.work_share->lock);
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376
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377 return test == 0;
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378 }
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379
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380 static bool
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381 gomp_loop_ordered_dynamic_next (long *istart, long *iend)
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382 {
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383 struct gomp_thread *thr = gomp_thread ();
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384 bool ret;
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385
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386 gomp_ordered_sync ();
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387 gomp_mutex_lock (&thr->ts.work_share->lock);
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388 ret = gomp_iter_dynamic_next_locked (istart, iend);
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389 if (ret)
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390 gomp_ordered_next ();
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391 else
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392 gomp_ordered_last ();
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393 gomp_mutex_unlock (&thr->ts.work_share->lock);
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394
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395 return ret;
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396 }
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397
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398 static bool
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399 gomp_loop_ordered_guided_next (long *istart, long *iend)
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400 {
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401 struct gomp_thread *thr = gomp_thread ();
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402 bool ret;
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403
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404 gomp_ordered_sync ();
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405 gomp_mutex_lock (&thr->ts.work_share->lock);
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406 ret = gomp_iter_guided_next_locked (istart, iend);
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407 if (ret)
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408 gomp_ordered_next ();
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409 else
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410 gomp_ordered_last ();
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411 gomp_mutex_unlock (&thr->ts.work_share->lock);
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412
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413 return ret;
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414 }
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415
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416 bool
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417 GOMP_loop_ordered_runtime_next (long *istart, long *iend)
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418 {
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419 struct gomp_thread *thr = gomp_thread ();
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420
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421 switch (thr->ts.work_share->sched)
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422 {
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423 case GFS_STATIC:
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424 case GFS_AUTO:
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425 return gomp_loop_ordered_static_next (istart, iend);
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426 case GFS_DYNAMIC:
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427 return gomp_loop_ordered_dynamic_next (istart, iend);
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428 case GFS_GUIDED:
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429 return gomp_loop_ordered_guided_next (istart, iend);
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430 default:
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431 abort ();
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432 }
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433 }
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434
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435 /* The GOMP_parallel_loop_* routines pre-initialize a work-share construct
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436 to avoid one synchronization once we get into the loop. */
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437
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438 static void
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439 gomp_parallel_loop_start (void (*fn) (void *), void *data,
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440 unsigned num_threads, long start, long end,
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441 long incr, enum gomp_schedule_type sched,
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442 long chunk_size)
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443 {
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444 struct gomp_team *team;
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445
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446 num_threads = gomp_resolve_num_threads (num_threads, 0);
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447 team = gomp_new_team (num_threads);
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448 gomp_loop_init (&team->work_shares[0], start, end, incr, sched, chunk_size);
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449 gomp_team_start (fn, data, num_threads, team);
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450 }
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451
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452 void
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453 GOMP_parallel_loop_static_start (void (*fn) (void *), void *data,
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454 unsigned num_threads, long start, long end,
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455 long incr, long chunk_size)
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456 {
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457 gomp_parallel_loop_start (fn, data, num_threads, start, end, incr,
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458 GFS_STATIC, chunk_size);
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|
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459 }
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|
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460
|
|
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461 void
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462 GOMP_parallel_loop_dynamic_start (void (*fn) (void *), void *data,
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|
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463 unsigned num_threads, long start, long end,
|
|
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464 long incr, long chunk_size)
|
|
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465 {
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|
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466 gomp_parallel_loop_start (fn, data, num_threads, start, end, incr,
|
|
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467 GFS_DYNAMIC, chunk_size);
|
|
|
468 }
|
|
|
469
|
|
|
470 void
|
|
|
471 GOMP_parallel_loop_guided_start (void (*fn) (void *), void *data,
|
|
|
472 unsigned num_threads, long start, long end,
|
|
|
473 long incr, long chunk_size)
|
|
|
474 {
|
|
|
475 gomp_parallel_loop_start (fn, data, num_threads, start, end, incr,
|
|
|
476 GFS_GUIDED, chunk_size);
|
|
|
477 }
|
|
|
478
|
|
|
479 void
|
|
|
480 GOMP_parallel_loop_runtime_start (void (*fn) (void *), void *data,
|
|
|
481 unsigned num_threads, long start, long end,
|
|
|
482 long incr)
|
|
|
483 {
|
|
|
484 struct gomp_task_icv *icv = gomp_icv (false);
|
|
|
485 gomp_parallel_loop_start (fn, data, num_threads, start, end, incr,
|
|
|
486 icv->run_sched_var, icv->run_sched_modifier);
|
|
|
487 }
|
|
|
488
|
|
|
489 /* The GOMP_loop_end* routines are called after the thread is told that
|
|
|
490 all loop iterations are complete. This first version synchronizes
|
|
|
491 all threads; the nowait version does not. */
|
|
|
492
|
|
|
493 void
|
|
|
494 GOMP_loop_end (void)
|
|
|
495 {
|
|
|
496 gomp_work_share_end ();
|
|
|
497 }
|
|
|
498
|
|
|
499 void
|
|
|
500 GOMP_loop_end_nowait (void)
|
|
|
501 {
|
|
|
502 gomp_work_share_end_nowait ();
|
|
|
503 }
|
|
|
504
|
|
|
505
|
|
|
506 /* We use static functions above so that we're sure that the "runtime"
|
|
|
507 function can defer to the proper routine without interposition. We
|
|
|
508 export the static function with a strong alias when possible, or with
|
|
|
509 a wrapper function otherwise. */
|
|
|
510
|
|
|
511 #ifdef HAVE_ATTRIBUTE_ALIAS
|
|
|
512 extern __typeof(gomp_loop_static_start) GOMP_loop_static_start
|
|
|
513 __attribute__((alias ("gomp_loop_static_start")));
|
|
|
514 extern __typeof(gomp_loop_dynamic_start) GOMP_loop_dynamic_start
|
|
|
515 __attribute__((alias ("gomp_loop_dynamic_start")));
|
|
|
516 extern __typeof(gomp_loop_guided_start) GOMP_loop_guided_start
|
|
|
517 __attribute__((alias ("gomp_loop_guided_start")));
|
|
|
518
|
|
|
519 extern __typeof(gomp_loop_ordered_static_start) GOMP_loop_ordered_static_start
|
|
|
520 __attribute__((alias ("gomp_loop_ordered_static_start")));
|
|
|
521 extern __typeof(gomp_loop_ordered_dynamic_start) GOMP_loop_ordered_dynamic_start
|
|
|
522 __attribute__((alias ("gomp_loop_ordered_dynamic_start")));
|
|
|
523 extern __typeof(gomp_loop_ordered_guided_start) GOMP_loop_ordered_guided_start
|
|
|
524 __attribute__((alias ("gomp_loop_ordered_guided_start")));
|
|
|
525
|
|
|
526 extern __typeof(gomp_loop_static_next) GOMP_loop_static_next
|
|
|
527 __attribute__((alias ("gomp_loop_static_next")));
|
|
|
528 extern __typeof(gomp_loop_dynamic_next) GOMP_loop_dynamic_next
|
|
|
529 __attribute__((alias ("gomp_loop_dynamic_next")));
|
|
|
530 extern __typeof(gomp_loop_guided_next) GOMP_loop_guided_next
|
|
|
531 __attribute__((alias ("gomp_loop_guided_next")));
|
|
|
532
|
|
|
533 extern __typeof(gomp_loop_ordered_static_next) GOMP_loop_ordered_static_next
|
|
|
534 __attribute__((alias ("gomp_loop_ordered_static_next")));
|
|
|
535 extern __typeof(gomp_loop_ordered_dynamic_next) GOMP_loop_ordered_dynamic_next
|
|
|
536 __attribute__((alias ("gomp_loop_ordered_dynamic_next")));
|
|
|
537 extern __typeof(gomp_loop_ordered_guided_next) GOMP_loop_ordered_guided_next
|
|
|
538 __attribute__((alias ("gomp_loop_ordered_guided_next")));
|
|
|
539 #else
|
|
|
540 bool
|
|
|
541 GOMP_loop_static_start (long start, long end, long incr, long chunk_size,
|
|
|
542 long *istart, long *iend)
|
|
|
543 {
|
|
|
544 return gomp_loop_static_start (start, end, incr, chunk_size, istart, iend);
|
|
|
545 }
|
|
|
546
|
|
|
547 bool
|
|
|
548 GOMP_loop_dynamic_start (long start, long end, long incr, long chunk_size,
|
|
|
549 long *istart, long *iend)
|
|
|
550 {
|
|
|
551 return gomp_loop_dynamic_start (start, end, incr, chunk_size, istart, iend);
|
|
|
552 }
|
|
|
553
|
|
|
554 bool
|
|
|
555 GOMP_loop_guided_start (long start, long end, long incr, long chunk_size,
|
|
|
556 long *istart, long *iend)
|
|
|
557 {
|
|
|
558 return gomp_loop_guided_start (start, end, incr, chunk_size, istart, iend);
|
|
|
559 }
|
|
|
560
|
|
|
561 bool
|
|
|
562 GOMP_loop_ordered_static_start (long start, long end, long incr,
|
|
|
563 long chunk_size, long *istart, long *iend)
|
|
|
564 {
|
|
|
565 return gomp_loop_ordered_static_start (start, end, incr, chunk_size,
|
|
|
566 istart, iend);
|
|
|
567 }
|
|
|
568
|
|
|
569 bool
|
|
|
570 GOMP_loop_ordered_dynamic_start (long start, long end, long incr,
|
|
|
571 long chunk_size, long *istart, long *iend)
|
|
|
572 {
|
|
|
573 return gomp_loop_ordered_dynamic_start (start, end, incr, chunk_size,
|
|
|
574 istart, iend);
|
|
|
575 }
|
|
|
576
|
|
|
577 bool
|
|
|
578 GOMP_loop_ordered_guided_start (long start, long end, long incr,
|
|
|
579 long chunk_size, long *istart, long *iend)
|
|
|
580 {
|
|
|
581 return gomp_loop_ordered_guided_start (start, end, incr, chunk_size,
|
|
|
582 istart, iend);
|
|
|
583 }
|
|
|
584
|
|
|
585 bool
|
|
|
586 GOMP_loop_static_next (long *istart, long *iend)
|
|
|
587 {
|
|
|
588 return gomp_loop_static_next (istart, iend);
|
|
|
589 }
|
|
|
590
|
|
|
591 bool
|
|
|
592 GOMP_loop_dynamic_next (long *istart, long *iend)
|
|
|
593 {
|
|
|
594 return gomp_loop_dynamic_next (istart, iend);
|
|
|
595 }
|
|
|
596
|
|
|
597 bool
|
|
|
598 GOMP_loop_guided_next (long *istart, long *iend)
|
|
|
599 {
|
|
|
600 return gomp_loop_guided_next (istart, iend);
|
|
|
601 }
|
|
|
602
|
|
|
603 bool
|
|
|
604 GOMP_loop_ordered_static_next (long *istart, long *iend)
|
|
|
605 {
|
|
|
606 return gomp_loop_ordered_static_next (istart, iend);
|
|
|
607 }
|
|
|
608
|
|
|
609 bool
|
|
|
610 GOMP_loop_ordered_dynamic_next (long *istart, long *iend)
|
|
|
611 {
|
|
|
612 return gomp_loop_ordered_dynamic_next (istart, iend);
|
|
|
613 }
|
|
|
614
|
|
|
615 bool
|
|
|
616 GOMP_loop_ordered_guided_next (long *istart, long *iend)
|
|
|
617 {
|
|
|
618 return gomp_loop_ordered_guided_next (istart, iend);
|
|
|
619 }
|
|
|
620 #endif
|
