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/* Copyright (C) 2005, 2008, 2009 Free Software Foundation, Inc. Contributed by Richard Henderson <rth@redhat.com>. This file is part of the GNU OpenMP Library (libgomp). Libgomp is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. Under Section 7 of GPL version 3, you are granted additional permissions described in the GCC Runtime Library Exception, version 3.1, as published by the Free Software Foundation. You should have received a copy of the GNU General Public License and a copy of the GCC Runtime Library Exception along with this program; see the files COPYING3 and COPYING.RUNTIME respectively. If not, see <http://www.gnu.org/licenses/>. */ /* This file handles the LOOP (FOR/DO) construct. */ #include <limits.h> #include <stdlib.h> #include "libgomp.h" /* Initialize the given work share construct from the given arguments. */ static inline void gomp_loop_init (struct gomp_work_share *ws, long start, long end, long incr, enum gomp_schedule_type sched, long chunk_size) { ws->sched = sched; ws->chunk_size = chunk_size; /* Canonicalize loops that have zero iterations to ->next == ->end. */ ws->end = ((incr > 0 && start > end) || (incr < 0 && start < end)) ? start : end; ws->incr = incr; ws->next = start; if (sched == GFS_DYNAMIC) { ws->chunk_size *= incr; #ifdef HAVE_SYNC_BUILTINS { /* For dynamic scheduling prepare things to make each iteration faster. */ struct gomp_thread *thr = gomp_thread (); struct gomp_team *team = thr->ts.team; long nthreads = team ? team->nthreads : 1; if (__builtin_expect (incr > 0, 1)) { /* Cheap overflow protection. */ if (__builtin_expect ((nthreads | ws->chunk_size) >= 1UL << (sizeof (long) * __CHAR_BIT__ / 2 - 1), 0)) ws->mode = 0; else ws->mode = ws->end < (LONG_MAX - (nthreads + 1) * ws->chunk_size); } /* Cheap overflow protection. */ else if (__builtin_expect ((nthreads | -ws->chunk_size) >= 1UL << (sizeof (long) * __CHAR_BIT__ / 2 - 1), 0)) ws->mode = 0; else ws->mode = ws->end > (nthreads + 1) * -ws->chunk_size - LONG_MAX; } #endif } } /* The *_start routines are called when first encountering a loop construct that is not bound directly to a parallel construct. The first thread that arrives will create the work-share construct; subsequent threads will see the construct exists and allocate work from it. START, END, INCR are the bounds of the loop; due to the restrictions of OpenMP, these values must be the same in every thread. This is not verified (nor is it entirely verifiable, since START is not necessarily retained intact in the work-share data structure). CHUNK_SIZE is the scheduling parameter; again this must be identical in all threads. Returns true if there's any work for this thread to perform. If so, *ISTART and *IEND are filled with the bounds of the iteration block allocated to this thread. Returns false if all work was assigned to other threads prior to this thread's arrival. */ static bool gomp_loop_static_start (long start, long end, long incr, long chunk_size, long *istart, long *iend) { struct gomp_thread *thr = gomp_thread (); thr->ts.static_trip = 0; if (gomp_work_share_start (false)) { gomp_loop_init (thr->ts.work_share, start, end, incr, GFS_STATIC, chunk_size); gomp_work_share_init_done (); } return !gomp_iter_static_next (istart, iend); } static bool gomp_loop_dynamic_start (long start, long end, long incr, long chunk_size, long *istart, long *iend) { struct gomp_thread *thr = gomp_thread (); bool ret; if (gomp_work_share_start (false)) { gomp_loop_init (thr->ts.work_share, start, end, incr, GFS_DYNAMIC, chunk_size); gomp_work_share_init_done (); } #ifdef HAVE_SYNC_BUILTINS ret = gomp_iter_dynamic_next (istart, iend); #else gomp_mutex_lock (&thr->ts.work_share->lock); ret = gomp_iter_dynamic_next_locked (istart, iend); gomp_mutex_unlock (&thr->ts.work_share->lock); #endif return ret; } static bool gomp_loop_guided_start (long start, long end, long incr, long chunk_size, long *istart, long *iend) { struct gomp_thread *thr = gomp_thread (); bool ret; if (gomp_work_share_start (false)) { gomp_loop_init (thr->ts.work_share, start, end, incr, GFS_GUIDED, chunk_size); gomp_work_share_init_done (); } #ifdef HAVE_SYNC_BUILTINS ret = gomp_iter_guided_next (istart, iend); #else gomp_mutex_lock (&thr->ts.work_share->lock); ret = gomp_iter_guided_next_locked (istart, iend); gomp_mutex_unlock (&thr->ts.work_share->lock); #endif return ret; } bool GOMP_loop_runtime_start (long start, long end, long incr, long *istart, long *iend) { struct gomp_task_icv *icv = gomp_icv (false); switch (icv->run_sched_var) { case GFS_STATIC: return gomp_loop_static_start (start, end, incr, icv->run_sched_modifier, istart, iend); case GFS_DYNAMIC: return gomp_loop_dynamic_start (start, end, incr, icv->run_sched_modifier, istart, iend); case GFS_GUIDED: return gomp_loop_guided_start (start, end, incr, icv->run_sched_modifier, istart, iend); case GFS_AUTO: /* For now map to schedule(static), later on we could play with feedback driven choice. */ return gomp_loop_static_start (start, end, incr, 0, istart, iend); default: abort (); } } /* The *_ordered_*_start routines are similar. The only difference is that this work-share construct is initialized to expect an ORDERED section. */ static bool gomp_loop_ordered_static_start (long start, long end, long incr, long chunk_size, long *istart, long *iend) { struct gomp_thread *thr = gomp_thread (); thr->ts.static_trip = 0; if (gomp_work_share_start (true)) { gomp_loop_init (thr->ts.work_share, start, end, incr, GFS_STATIC, chunk_size); gomp_ordered_static_init (); gomp_work_share_init_done (); } return !gomp_iter_static_next (istart, iend); } static bool gomp_loop_ordered_dynamic_start (long start, long end, long incr, long chunk_size, long *istart, long *iend) { struct gomp_thread *thr = gomp_thread (); bool ret; if (gomp_work_share_start (true)) { gomp_loop_init (thr->ts.work_share, start, end, incr, GFS_DYNAMIC, chunk_size); gomp_mutex_lock (&thr->ts.work_share->lock); gomp_work_share_init_done (); } else gomp_mutex_lock (&thr->ts.work_share->lock); ret = gomp_iter_dynamic_next_locked (istart, iend); if (ret) gomp_ordered_first (); gomp_mutex_unlock (&thr->ts.work_share->lock); return ret; } static bool gomp_loop_ordered_guided_start (long start, long end, long incr, long chunk_size, long *istart, long *iend) { struct gomp_thread *thr = gomp_thread (); bool ret; if (gomp_work_share_start (true)) { gomp_loop_init (thr->ts.work_share, start, end, incr, GFS_GUIDED, chunk_size); gomp_mutex_lock (&thr->ts.work_share->lock); gomp_work_share_init_done (); } else gomp_mutex_lock (&thr->ts.work_share->lock); ret = gomp_iter_guided_next_locked (istart, iend); if (ret) gomp_ordered_first (); gomp_mutex_unlock (&thr->ts.work_share->lock); return ret; } bool GOMP_loop_ordered_runtime_start (long start, long end, long incr, long *istart, long *iend) { struct gomp_task_icv *icv = gomp_icv (false); switch (icv->run_sched_var) { case GFS_STATIC: return gomp_loop_ordered_static_start (start, end, incr, icv->run_sched_modifier, istart, iend); case GFS_DYNAMIC: return gomp_loop_ordered_dynamic_start (start, end, incr, icv->run_sched_modifier, istart, iend); case GFS_GUIDED: return gomp_loop_ordered_guided_start (start, end, incr, icv->run_sched_modifier, istart, iend); case GFS_AUTO: /* For now map to schedule(static), later on we could play with feedback driven choice. */ return gomp_loop_ordered_static_start (start, end, incr, 0, istart, iend); default: abort (); } } /* The *_next routines are called when the thread completes processing of the iteration block currently assigned to it. If the work-share construct is bound directly to a parallel construct, then the iteration bounds may have been set up before the parallel. In which case, this may be the first iteration for the thread. Returns true if there is work remaining to be performed; *ISTART and *IEND are filled with a new iteration block. Returns false if all work has been assigned. */ static bool gomp_loop_static_next (long *istart, long *iend) { return !gomp_iter_static_next (istart, iend); } static bool gomp_loop_dynamic_next (long *istart, long *iend) { bool ret; #ifdef HAVE_SYNC_BUILTINS ret = gomp_iter_dynamic_next (istart, iend); #else struct gomp_thread *thr = gomp_thread (); gomp_mutex_lock (&thr->ts.work_share->lock); ret = gomp_iter_dynamic_next_locked (istart, iend); gomp_mutex_unlock (&thr->ts.work_share->lock); #endif return ret; } static bool gomp_loop_guided_next (long *istart, long *iend) { bool ret; #ifdef HAVE_SYNC_BUILTINS ret = gomp_iter_guided_next (istart, iend); #else struct gomp_thread *thr = gomp_thread (); gomp_mutex_lock (&thr->ts.work_share->lock); ret = gomp_iter_guided_next_locked (istart, iend); gomp_mutex_unlock (&thr->ts.work_share->lock); #endif return ret; } bool GOMP_loop_runtime_next (long *istart, long *iend) { struct gomp_thread *thr = gomp_thread (); switch (thr->ts.work_share->sched) { case GFS_STATIC: case GFS_AUTO: return gomp_loop_static_next (istart, iend); case GFS_DYNAMIC: return gomp_loop_dynamic_next (istart, iend); case GFS_GUIDED: return gomp_loop_guided_next (istart, iend); default: abort (); } } /* The *_ordered_*_next routines are called when the thread completes processing of the iteration block currently assigned to it. Returns true if there is work remaining to be performed; *ISTART and *IEND are filled with a new iteration block. Returns false if all work has been assigned. */ static bool gomp_loop_ordered_static_next (long *istart, long *iend) { struct gomp_thread *thr = gomp_thread (); int test; gomp_ordered_sync (); gomp_mutex_lock (&thr->ts.work_share->lock); test = gomp_iter_static_next (istart, iend); if (test >= 0) gomp_ordered_static_next (); gomp_mutex_unlock (&thr->ts.work_share->lock); return test == 0; } static bool gomp_loop_ordered_dynamic_next (long *istart, long *iend) { struct gomp_thread *thr = gomp_thread (); bool ret; gomp_ordered_sync (); gomp_mutex_lock (&thr->ts.work_share->lock); ret = gomp_iter_dynamic_next_locked (istart, iend); if (ret) gomp_ordered_next (); else gomp_ordered_last (); gomp_mutex_unlock (&thr->ts.work_share->lock); return ret; } static bool gomp_loop_ordered_guided_next (long *istart, long *iend) { struct gomp_thread *thr = gomp_thread (); bool ret; gomp_ordered_sync (); gomp_mutex_lock (&thr->ts.work_share->lock); ret = gomp_iter_guided_next_locked (istart, iend); if (ret) gomp_ordered_next (); else gomp_ordered_last (); gomp_mutex_unlock (&thr->ts.work_share->lock); return ret; } bool GOMP_loop_ordered_runtime_next (long *istart, long *iend) { struct gomp_thread *thr = gomp_thread (); switch (thr->ts.work_share->sched) { case GFS_STATIC: case GFS_AUTO: return gomp_loop_ordered_static_next (istart, iend); case GFS_DYNAMIC: return gomp_loop_ordered_dynamic_next (istart, iend); case GFS_GUIDED: return gomp_loop_ordered_guided_next (istart, iend); default: abort (); } } /* The GOMP_parallel_loop_* routines pre-initialize a work-share construct to avoid one synchronization once we get into the loop. */ static void gomp_parallel_loop_start (void (*fn) (void *), void *data, unsigned num_threads, long start, long end, long incr, enum gomp_schedule_type sched, long chunk_size) { struct gomp_team *team; num_threads = gomp_resolve_num_threads (num_threads, 0); team = gomp_new_team (num_threads); gomp_loop_init (&team->work_shares[0], start, end, incr, sched, chunk_size); gomp_team_start (fn, data, num_threads, team); } void GOMP_parallel_loop_static_start (void (*fn) (void *), void *data, unsigned num_threads, long start, long end, long incr, long chunk_size) { gomp_parallel_loop_start (fn, data, num_threads, start, end, incr, GFS_STATIC, chunk_size); } void GOMP_parallel_loop_dynamic_start (void (*fn) (void *), void *data, unsigned num_threads, long start, long end, long incr, long chunk_size) { gomp_parallel_loop_start (fn, data, num_threads, start, end, incr, GFS_DYNAMIC, chunk_size); } void GOMP_parallel_loop_guided_start (void (*fn) (void *), void *data, unsigned num_threads, long start, long end, long incr, long chunk_size) { gomp_parallel_loop_start (fn, data, num_threads, start, end, incr, GFS_GUIDED, chunk_size); } void GOMP_parallel_loop_runtime_start (void (*fn) (void *), void *data, unsigned num_threads, long start, long end, long incr) { struct gomp_task_icv *icv = gomp_icv (false); gomp_parallel_loop_start (fn, data, num_threads, start, end, incr, icv->run_sched_var, icv->run_sched_modifier); } /* The GOMP_loop_end* routines are called after the thread is told that all loop iterations are complete. This first version synchronizes all threads; the nowait version does not. */ void GOMP_loop_end (void) { gomp_work_share_end (); } void GOMP_loop_end_nowait (void) { gomp_work_share_end_nowait (); } /* We use static functions above so that we're sure that the "runtime" function can defer to the proper routine without interposition. We export the static function with a strong alias when possible, or with a wrapper function otherwise. */ #ifdef HAVE_ATTRIBUTE_ALIAS extern __typeof(gomp_loop_static_start) GOMP_loop_static_start __attribute__((alias ("gomp_loop_static_start"))); extern __typeof(gomp_loop_dynamic_start) GOMP_loop_dynamic_start __attribute__((alias ("gomp_loop_dynamic_start"))); extern __typeof(gomp_loop_guided_start) GOMP_loop_guided_start __attribute__((alias ("gomp_loop_guided_start"))); extern __typeof(gomp_loop_ordered_static_start) GOMP_loop_ordered_static_start __attribute__((alias ("gomp_loop_ordered_static_start"))); extern __typeof(gomp_loop_ordered_dynamic_start) GOMP_loop_ordered_dynamic_start __attribute__((alias ("gomp_loop_ordered_dynamic_start"))); extern __typeof(gomp_loop_ordered_guided_start) GOMP_loop_ordered_guided_start __attribute__((alias ("gomp_loop_ordered_guided_start"))); extern __typeof(gomp_loop_static_next) GOMP_loop_static_next __attribute__((alias ("gomp_loop_static_next"))); extern __typeof(gomp_loop_dynamic_next) GOMP_loop_dynamic_next __attribute__((alias ("gomp_loop_dynamic_next"))); extern __typeof(gomp_loop_guided_next) GOMP_loop_guided_next __attribute__((alias ("gomp_loop_guided_next"))); extern __typeof(gomp_loop_ordered_static_next) GOMP_loop_ordered_static_next __attribute__((alias ("gomp_loop_ordered_static_next"))); extern __typeof(gomp_loop_ordered_dynamic_next) GOMP_loop_ordered_dynamic_next __attribute__((alias ("gomp_loop_ordered_dynamic_next"))); extern __typeof(gomp_loop_ordered_guided_next) GOMP_loop_ordered_guided_next __attribute__((alias ("gomp_loop_ordered_guided_next"))); #else bool GOMP_loop_static_start (long start, long end, long incr, long chunk_size, long *istart, long *iend) { return gomp_loop_static_start (start, end, incr, chunk_size, istart, iend); } bool GOMP_loop_dynamic_start (long start, long end, long incr, long chunk_size, long *istart, long *iend) { return gomp_loop_dynamic_start (start, end, incr, chunk_size, istart, iend); } bool GOMP_loop_guided_start (long start, long end, long incr, long chunk_size, long *istart, long *iend) { return gomp_loop_guided_start (start, end, incr, chunk_size, istart, iend); } bool GOMP_loop_ordered_static_start (long start, long end, long incr, long chunk_size, long *istart, long *iend) { return gomp_loop_ordered_static_start (start, end, incr, chunk_size, istart, iend); } bool GOMP_loop_ordered_dynamic_start (long start, long end, long incr, long chunk_size, long *istart, long *iend) { return gomp_loop_ordered_dynamic_start (start, end, incr, chunk_size, istart, iend); } bool GOMP_loop_ordered_guided_start (long start, long end, long incr, long chunk_size, long *istart, long *iend) { return gomp_loop_ordered_guided_start (start, end, incr, chunk_size, istart, iend); } bool GOMP_loop_static_next (long *istart, long *iend) { return gomp_loop_static_next (istart, iend); } bool GOMP_loop_dynamic_next (long *istart, long *iend) { return gomp_loop_dynamic_next (istart, iend); } bool GOMP_loop_guided_next (long *istart, long *iend) { return gomp_loop_guided_next (istart, iend); } bool GOMP_loop_ordered_static_next (long *istart, long *iend) { return gomp_loop_ordered_static_next (istart, iend); } bool GOMP_loop_ordered_dynamic_next (long *istart, long *iend) { return gomp_loop_ordered_dynamic_next (istart, iend); } bool GOMP_loop_ordered_guided_next (long *istart, long *iend) { return gomp_loop_ordered_guided_next (istart, iend); } #endif
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