828 lines
23 KiB
C
828 lines
23 KiB
C
/* Copyright (C) 2005-2019 Free Software Foundation, Inc.
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Contributed by Richard Henderson <rth@redhat.com>.
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This file is part of the GNU Offloading and Multi Processing Library
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(libgomp).
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Libgomp is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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/* This file handles the ORDERED construct. */
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#include "libgomp.h"
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#include <stdarg.h>
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#include <string.h>
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#include "doacross.h"
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/* This function is called when first allocating an iteration block. That
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is, the thread is not currently on the queue. The work-share lock must
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be held on entry. */
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void
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gomp_ordered_first (void)
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{
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struct gomp_thread *thr = gomp_thread ();
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struct gomp_team *team = thr->ts.team;
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struct gomp_work_share *ws = thr->ts.work_share;
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unsigned index;
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/* Work share constructs can be orphaned. */
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if (team == NULL || team->nthreads == 1)
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return;
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index = ws->ordered_cur + ws->ordered_num_used;
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if (index >= team->nthreads)
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index -= team->nthreads;
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ws->ordered_team_ids[index] = thr->ts.team_id;
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/* If this is the first and only thread in the queue, then there is
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no one to release us when we get to our ordered section. Post to
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our own release queue now so that we won't block later. */
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if (ws->ordered_num_used++ == 0)
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gomp_sem_post (team->ordered_release[thr->ts.team_id]);
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}
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/* This function is called when completing the last iteration block. That
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is, there are no more iterations to perform and so the thread should be
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removed from the queue entirely. Because of the way ORDERED blocks are
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managed, it follows that we currently own access to the ORDERED block,
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and should now pass it on to the next thread. The work-share lock must
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be held on entry. */
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void
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gomp_ordered_last (void)
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{
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struct gomp_thread *thr = gomp_thread ();
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struct gomp_team *team = thr->ts.team;
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struct gomp_work_share *ws = thr->ts.work_share;
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unsigned next_id;
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/* Work share constructs can be orphaned. */
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if (team == NULL || team->nthreads == 1)
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return;
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/* We're no longer the owner. */
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ws->ordered_owner = -1;
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/* If we're not the last thread in the queue, then wake the next. */
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if (--ws->ordered_num_used > 0)
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{
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unsigned next = ws->ordered_cur + 1;
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if (next == team->nthreads)
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next = 0;
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ws->ordered_cur = next;
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next_id = ws->ordered_team_ids[next];
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gomp_sem_post (team->ordered_release[next_id]);
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}
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}
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/* This function is called when allocating a subsequent allocation block.
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That is, we're done with the current iteration block and we're allocating
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another. This is the logical combination of a call to gomp_ordered_last
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followed by a call to gomp_ordered_first. The work-share lock must be
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held on entry. */
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void
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gomp_ordered_next (void)
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{
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struct gomp_thread *thr = gomp_thread ();
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struct gomp_team *team = thr->ts.team;
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struct gomp_work_share *ws = thr->ts.work_share;
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unsigned index, next_id;
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/* Work share constructs can be orphaned. */
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if (team == NULL || team->nthreads == 1)
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return;
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/* We're no longer the owner. */
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ws->ordered_owner = -1;
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/* If there's only one thread in the queue, that must be us. */
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if (ws->ordered_num_used == 1)
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{
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/* We have a similar situation as in gomp_ordered_first
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where we need to post to our own release semaphore. */
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gomp_sem_post (team->ordered_release[thr->ts.team_id]);
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return;
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}
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/* If the queue is entirely full, then we move ourself to the end of
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the queue merely by incrementing ordered_cur. Only if it's not
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full do we have to write our id. */
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if (ws->ordered_num_used < team->nthreads)
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{
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index = ws->ordered_cur + ws->ordered_num_used;
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if (index >= team->nthreads)
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index -= team->nthreads;
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ws->ordered_team_ids[index] = thr->ts.team_id;
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}
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index = ws->ordered_cur + 1;
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if (index == team->nthreads)
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index = 0;
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ws->ordered_cur = index;
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next_id = ws->ordered_team_ids[index];
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gomp_sem_post (team->ordered_release[next_id]);
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}
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/* This function is called when a statically scheduled loop is first
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being created. */
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void
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gomp_ordered_static_init (void)
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{
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struct gomp_thread *thr = gomp_thread ();
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struct gomp_team *team = thr->ts.team;
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if (team == NULL || team->nthreads == 1)
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return;
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gomp_sem_post (team->ordered_release[0]);
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}
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/* This function is called when a statically scheduled loop is moving to
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the next allocation block. Static schedules are not first come first
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served like the others, so we're to move to the numerically next thread,
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not the next thread on a list. The work-share lock should *not* be held
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on entry. */
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void
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gomp_ordered_static_next (void)
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{
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struct gomp_thread *thr = gomp_thread ();
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struct gomp_team *team = thr->ts.team;
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struct gomp_work_share *ws = thr->ts.work_share;
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unsigned id = thr->ts.team_id;
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if (team == NULL || team->nthreads == 1)
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return;
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ws->ordered_owner = -1;
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/* This thread currently owns the lock. Increment the owner. */
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if (++id == team->nthreads)
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id = 0;
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ws->ordered_team_ids[0] = id;
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gomp_sem_post (team->ordered_release[id]);
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}
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/* This function is called when we need to assert that the thread owns the
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ordered section. Due to the problem of posted-but-not-waited semaphores,
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this needs to happen before completing a loop iteration. */
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void
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gomp_ordered_sync (void)
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{
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struct gomp_thread *thr = gomp_thread ();
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struct gomp_team *team = thr->ts.team;
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struct gomp_work_share *ws = thr->ts.work_share;
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/* Work share constructs can be orphaned. But this clearly means that
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we are the only thread, and so we automatically own the section. */
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if (team == NULL || team->nthreads == 1)
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return;
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/* ??? I believe it to be safe to access this data without taking the
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ws->lock. The only presumed race condition is with the previous
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thread on the queue incrementing ordered_cur such that it points
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to us, concurrently with our check below. But our team_id is
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already present in the queue, and the other thread will always
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post to our release semaphore. So the two cases are that we will
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either win the race an momentarily block on the semaphore, or lose
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the race and find the semaphore already unlocked and so not block.
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Either way we get correct results.
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However, there is an implicit flush on entry to an ordered region,
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so we do need to have a barrier here. If we were taking a lock
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this could be MEMMODEL_RELEASE since the acquire would be covered
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by the lock. */
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__atomic_thread_fence (MEMMODEL_ACQ_REL);
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if (ws->ordered_owner != thr->ts.team_id)
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{
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gomp_sem_wait (team->ordered_release[thr->ts.team_id]);
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ws->ordered_owner = thr->ts.team_id;
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}
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}
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/* This function is called by user code when encountering the start of an
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ORDERED block. We must check to see if the current thread is at the
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head of the queue, and if not, block. */
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#ifdef HAVE_ATTRIBUTE_ALIAS
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extern void GOMP_ordered_start (void)
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__attribute__((alias ("gomp_ordered_sync")));
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#else
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void
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GOMP_ordered_start (void)
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{
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gomp_ordered_sync ();
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}
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#endif
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/* This function is called by user code when encountering the end of an
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ORDERED block. With the current ORDERED implementation there's nothing
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for us to do.
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However, the current implementation has a flaw in that it does not allow
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the next thread into the ORDERED section immediately after the current
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thread exits the ORDERED section in its last iteration. The existence
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of this function allows the implementation to change. */
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void
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GOMP_ordered_end (void)
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{
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}
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/* DOACROSS initialization. */
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#define MAX_COLLAPSED_BITS (__SIZEOF_LONG__ * __CHAR_BIT__)
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void
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gomp_doacross_init (unsigned ncounts, long *counts, long chunk_size,
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size_t extra)
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{
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struct gomp_thread *thr = gomp_thread ();
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struct gomp_team *team = thr->ts.team;
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struct gomp_work_share *ws = thr->ts.work_share;
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unsigned int i, bits[MAX_COLLAPSED_BITS], num_bits = 0;
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unsigned long ent, num_ents, elt_sz, shift_sz;
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struct gomp_doacross_work_share *doacross;
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if (team == NULL || team->nthreads == 1)
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{
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empty:
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if (!extra)
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ws->doacross = NULL;
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else
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{
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doacross = gomp_malloc_cleared (sizeof (*doacross) + extra);
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doacross->extra = (void *) (doacross + 1);
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ws->doacross = doacross;
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}
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return;
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}
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for (i = 0; i < ncounts; i++)
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{
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/* If any count is 0, GOMP_doacross_{post,wait} can't be called. */
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if (counts[i] == 0)
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goto empty;
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if (num_bits <= MAX_COLLAPSED_BITS)
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{
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unsigned int this_bits;
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if (counts[i] == 1)
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this_bits = 1;
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else
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this_bits = __SIZEOF_LONG__ * __CHAR_BIT__
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- __builtin_clzl (counts[i] - 1);
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if (num_bits + this_bits <= MAX_COLLAPSED_BITS)
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{
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bits[i] = this_bits;
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num_bits += this_bits;
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}
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else
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num_bits = MAX_COLLAPSED_BITS + 1;
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}
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}
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if (ws->sched == GFS_STATIC)
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num_ents = team->nthreads;
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else if (ws->sched == GFS_GUIDED)
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num_ents = counts[0];
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else
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num_ents = (counts[0] - 1) / chunk_size + 1;
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if (num_bits <= MAX_COLLAPSED_BITS)
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{
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elt_sz = sizeof (unsigned long);
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shift_sz = ncounts * sizeof (unsigned int);
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}
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else
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{
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elt_sz = sizeof (unsigned long) * ncounts;
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shift_sz = 0;
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}
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elt_sz = (elt_sz + 63) & ~63UL;
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doacross = gomp_malloc (sizeof (*doacross) + 63 + num_ents * elt_sz
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+ shift_sz + extra);
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doacross->chunk_size = chunk_size;
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doacross->elt_sz = elt_sz;
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doacross->ncounts = ncounts;
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doacross->flattened = false;
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doacross->array = (unsigned char *)
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((((uintptr_t) (doacross + 1)) + 63 + shift_sz)
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& ~(uintptr_t) 63);
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if (extra)
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{
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doacross->extra = doacross->array + num_ents * elt_sz;
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memset (doacross->extra, '\0', extra);
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}
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else
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doacross->extra = NULL;
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if (num_bits <= MAX_COLLAPSED_BITS)
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{
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unsigned int shift_count = 0;
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doacross->flattened = true;
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for (i = ncounts; i > 0; i--)
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{
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doacross->shift_counts[i - 1] = shift_count;
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shift_count += bits[i - 1];
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}
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for (ent = 0; ent < num_ents; ent++)
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*(unsigned long *) (doacross->array + ent * elt_sz) = 0;
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}
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else
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for (ent = 0; ent < num_ents; ent++)
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memset (doacross->array + ent * elt_sz, '\0',
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sizeof (unsigned long) * ncounts);
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if (ws->sched == GFS_STATIC && chunk_size == 0)
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{
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unsigned long q = counts[0] / num_ents;
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unsigned long t = counts[0] % num_ents;
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doacross->boundary = t * (q + 1);
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doacross->q = q;
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doacross->t = t;
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}
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ws->doacross = doacross;
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}
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/* DOACROSS POST operation. */
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void
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GOMP_doacross_post (long *counts)
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{
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struct gomp_thread *thr = gomp_thread ();
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struct gomp_work_share *ws = thr->ts.work_share;
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struct gomp_doacross_work_share *doacross = ws->doacross;
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unsigned long ent;
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unsigned int i;
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if (__builtin_expect (doacross == NULL, 0)
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|| __builtin_expect (doacross->array == NULL, 0))
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{
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__sync_synchronize ();
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return;
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}
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if (__builtin_expect (ws->sched == GFS_STATIC, 1))
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ent = thr->ts.team_id;
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else if (ws->sched == GFS_GUIDED)
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ent = counts[0];
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else
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ent = counts[0] / doacross->chunk_size;
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unsigned long *array = (unsigned long *) (doacross->array
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+ ent * doacross->elt_sz);
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if (__builtin_expect (doacross->flattened, 1))
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{
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unsigned long flattened
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= (unsigned long) counts[0] << doacross->shift_counts[0];
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for (i = 1; i < doacross->ncounts; i++)
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flattened |= (unsigned long) counts[i]
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<< doacross->shift_counts[i];
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flattened++;
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if (flattened == __atomic_load_n (array, MEMMODEL_ACQUIRE))
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__atomic_thread_fence (MEMMODEL_RELEASE);
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else
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__atomic_store_n (array, flattened, MEMMODEL_RELEASE);
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return;
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}
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__atomic_thread_fence (MEMMODEL_ACQUIRE);
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for (i = doacross->ncounts; i-- > 0; )
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{
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if (counts[i] + 1UL != __atomic_load_n (&array[i], MEMMODEL_RELAXED))
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__atomic_store_n (&array[i], counts[i] + 1UL, MEMMODEL_RELEASE);
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}
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}
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/* DOACROSS WAIT operation. */
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void
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GOMP_doacross_wait (long first, ...)
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{
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struct gomp_thread *thr = gomp_thread ();
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struct gomp_work_share *ws = thr->ts.work_share;
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struct gomp_doacross_work_share *doacross = ws->doacross;
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va_list ap;
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unsigned long ent;
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unsigned int i;
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if (__builtin_expect (doacross == NULL, 0)
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|| __builtin_expect (doacross->array == NULL, 0))
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{
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__sync_synchronize ();
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return;
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}
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if (__builtin_expect (ws->sched == GFS_STATIC, 1))
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{
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if (ws->chunk_size == 0)
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{
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if (first < doacross->boundary)
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ent = first / (doacross->q + 1);
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else
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ent = (first - doacross->boundary) / doacross->q
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+ doacross->t;
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}
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else
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ent = first / ws->chunk_size % thr->ts.team->nthreads;
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}
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else if (ws->sched == GFS_GUIDED)
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ent = first;
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else
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ent = first / doacross->chunk_size;
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unsigned long *array = (unsigned long *) (doacross->array
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+ ent * doacross->elt_sz);
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if (__builtin_expect (doacross->flattened, 1))
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{
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unsigned long flattened
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= (unsigned long) first << doacross->shift_counts[0];
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unsigned long cur;
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va_start (ap, first);
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for (i = 1; i < doacross->ncounts; i++)
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flattened |= (unsigned long) va_arg (ap, long)
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<< doacross->shift_counts[i];
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cur = __atomic_load_n (array, MEMMODEL_ACQUIRE);
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if (flattened < cur)
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{
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__atomic_thread_fence (MEMMODEL_RELEASE);
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va_end (ap);
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return;
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}
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doacross_spin (array, flattened, cur);
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__atomic_thread_fence (MEMMODEL_RELEASE);
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va_end (ap);
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return;
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}
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do
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{
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va_start (ap, first);
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for (i = 0; i < doacross->ncounts; i++)
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{
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unsigned long thisv
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= (unsigned long) (i ? va_arg (ap, long) : first) + 1;
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unsigned long cur = __atomic_load_n (&array[i], MEMMODEL_RELAXED);
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if (thisv < cur)
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{
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i = doacross->ncounts;
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break;
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}
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if (thisv > cur)
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break;
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}
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va_end (ap);
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if (i == doacross->ncounts)
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break;
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cpu_relax ();
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}
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while (1);
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__sync_synchronize ();
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}
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typedef unsigned long long gomp_ull;
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void
|
|
gomp_doacross_ull_init (unsigned ncounts, gomp_ull *counts,
|
|
gomp_ull chunk_size, size_t extra)
|
|
{
|
|
struct gomp_thread *thr = gomp_thread ();
|
|
struct gomp_team *team = thr->ts.team;
|
|
struct gomp_work_share *ws = thr->ts.work_share;
|
|
unsigned int i, bits[MAX_COLLAPSED_BITS], num_bits = 0;
|
|
unsigned long ent, num_ents, elt_sz, shift_sz;
|
|
struct gomp_doacross_work_share *doacross;
|
|
|
|
if (team == NULL || team->nthreads == 1)
|
|
{
|
|
empty:
|
|
if (!extra)
|
|
ws->doacross = NULL;
|
|
else
|
|
{
|
|
doacross = gomp_malloc_cleared (sizeof (*doacross) + extra);
|
|
doacross->extra = (void *) (doacross + 1);
|
|
ws->doacross = doacross;
|
|
}
|
|
return;
|
|
}
|
|
|
|
for (i = 0; i < ncounts; i++)
|
|
{
|
|
/* If any count is 0, GOMP_doacross_{post,wait} can't be called. */
|
|
if (counts[i] == 0)
|
|
goto empty;
|
|
|
|
if (num_bits <= MAX_COLLAPSED_BITS)
|
|
{
|
|
unsigned int this_bits;
|
|
if (counts[i] == 1)
|
|
this_bits = 1;
|
|
else
|
|
this_bits = __SIZEOF_LONG_LONG__ * __CHAR_BIT__
|
|
- __builtin_clzll (counts[i] - 1);
|
|
if (num_bits + this_bits <= MAX_COLLAPSED_BITS)
|
|
{
|
|
bits[i] = this_bits;
|
|
num_bits += this_bits;
|
|
}
|
|
else
|
|
num_bits = MAX_COLLAPSED_BITS + 1;
|
|
}
|
|
}
|
|
|
|
if (ws->sched == GFS_STATIC)
|
|
num_ents = team->nthreads;
|
|
else if (ws->sched == GFS_GUIDED)
|
|
num_ents = counts[0];
|
|
else
|
|
num_ents = (counts[0] - 1) / chunk_size + 1;
|
|
if (num_bits <= MAX_COLLAPSED_BITS)
|
|
{
|
|
elt_sz = sizeof (unsigned long);
|
|
shift_sz = ncounts * sizeof (unsigned int);
|
|
}
|
|
else
|
|
{
|
|
if (sizeof (gomp_ull) == sizeof (unsigned long))
|
|
elt_sz = sizeof (gomp_ull) * ncounts;
|
|
else if (sizeof (gomp_ull) == 2 * sizeof (unsigned long))
|
|
elt_sz = sizeof (unsigned long) * 2 * ncounts;
|
|
else
|
|
abort ();
|
|
shift_sz = 0;
|
|
}
|
|
elt_sz = (elt_sz + 63) & ~63UL;
|
|
|
|
doacross = gomp_malloc (sizeof (*doacross) + 63 + num_ents * elt_sz
|
|
+ shift_sz);
|
|
doacross->chunk_size_ull = chunk_size;
|
|
doacross->elt_sz = elt_sz;
|
|
doacross->ncounts = ncounts;
|
|
doacross->flattened = false;
|
|
doacross->boundary = 0;
|
|
doacross->array = (unsigned char *)
|
|
((((uintptr_t) (doacross + 1)) + 63 + shift_sz)
|
|
& ~(uintptr_t) 63);
|
|
if (extra)
|
|
{
|
|
doacross->extra = doacross->array + num_ents * elt_sz;
|
|
memset (doacross->extra, '\0', extra);
|
|
}
|
|
else
|
|
doacross->extra = NULL;
|
|
if (num_bits <= MAX_COLLAPSED_BITS)
|
|
{
|
|
unsigned int shift_count = 0;
|
|
doacross->flattened = true;
|
|
for (i = ncounts; i > 0; i--)
|
|
{
|
|
doacross->shift_counts[i - 1] = shift_count;
|
|
shift_count += bits[i - 1];
|
|
}
|
|
for (ent = 0; ent < num_ents; ent++)
|
|
*(unsigned long *) (doacross->array + ent * elt_sz) = 0;
|
|
}
|
|
else
|
|
for (ent = 0; ent < num_ents; ent++)
|
|
memset (doacross->array + ent * elt_sz, '\0',
|
|
sizeof (unsigned long) * ncounts);
|
|
if (ws->sched == GFS_STATIC && chunk_size == 0)
|
|
{
|
|
gomp_ull q = counts[0] / num_ents;
|
|
gomp_ull t = counts[0] % num_ents;
|
|
doacross->boundary_ull = t * (q + 1);
|
|
doacross->q_ull = q;
|
|
doacross->t = t;
|
|
}
|
|
ws->doacross = doacross;
|
|
}
|
|
|
|
/* DOACROSS POST operation. */
|
|
|
|
void
|
|
GOMP_doacross_ull_post (gomp_ull *counts)
|
|
{
|
|
struct gomp_thread *thr = gomp_thread ();
|
|
struct gomp_work_share *ws = thr->ts.work_share;
|
|
struct gomp_doacross_work_share *doacross = ws->doacross;
|
|
unsigned long ent;
|
|
unsigned int i;
|
|
|
|
if (__builtin_expect (doacross == NULL, 0)
|
|
|| __builtin_expect (doacross->array == NULL, 0))
|
|
{
|
|
__sync_synchronize ();
|
|
return;
|
|
}
|
|
|
|
if (__builtin_expect (ws->sched == GFS_STATIC, 1))
|
|
ent = thr->ts.team_id;
|
|
else if (ws->sched == GFS_GUIDED)
|
|
ent = counts[0];
|
|
else
|
|
ent = counts[0] / doacross->chunk_size_ull;
|
|
|
|
if (__builtin_expect (doacross->flattened, 1))
|
|
{
|
|
unsigned long *array = (unsigned long *) (doacross->array
|
|
+ ent * doacross->elt_sz);
|
|
gomp_ull flattened
|
|
= counts[0] << doacross->shift_counts[0];
|
|
|
|
for (i = 1; i < doacross->ncounts; i++)
|
|
flattened |= counts[i] << doacross->shift_counts[i];
|
|
flattened++;
|
|
if (flattened == __atomic_load_n (array, MEMMODEL_ACQUIRE))
|
|
__atomic_thread_fence (MEMMODEL_RELEASE);
|
|
else
|
|
__atomic_store_n (array, flattened, MEMMODEL_RELEASE);
|
|
return;
|
|
}
|
|
|
|
__atomic_thread_fence (MEMMODEL_ACQUIRE);
|
|
if (sizeof (gomp_ull) == sizeof (unsigned long))
|
|
{
|
|
gomp_ull *array = (gomp_ull *) (doacross->array
|
|
+ ent * doacross->elt_sz);
|
|
|
|
for (i = doacross->ncounts; i-- > 0; )
|
|
{
|
|
if (counts[i] + 1UL != __atomic_load_n (&array[i], MEMMODEL_RELAXED))
|
|
__atomic_store_n (&array[i], counts[i] + 1UL, MEMMODEL_RELEASE);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
unsigned long *array = (unsigned long *) (doacross->array
|
|
+ ent * doacross->elt_sz);
|
|
|
|
for (i = doacross->ncounts; i-- > 0; )
|
|
{
|
|
gomp_ull cull = counts[i] + 1UL;
|
|
unsigned long c = (unsigned long) cull;
|
|
if (c != __atomic_load_n (&array[2 * i + 1], MEMMODEL_RELAXED))
|
|
__atomic_store_n (&array[2 * i + 1], c, MEMMODEL_RELEASE);
|
|
c = cull >> (__SIZEOF_LONG_LONG__ * __CHAR_BIT__ / 2);
|
|
if (c != __atomic_load_n (&array[2 * i], MEMMODEL_RELAXED))
|
|
__atomic_store_n (&array[2 * i], c, MEMMODEL_RELEASE);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* DOACROSS WAIT operation. */
|
|
|
|
void
|
|
GOMP_doacross_ull_wait (gomp_ull first, ...)
|
|
{
|
|
struct gomp_thread *thr = gomp_thread ();
|
|
struct gomp_work_share *ws = thr->ts.work_share;
|
|
struct gomp_doacross_work_share *doacross = ws->doacross;
|
|
va_list ap;
|
|
unsigned long ent;
|
|
unsigned int i;
|
|
|
|
if (__builtin_expect (doacross == NULL, 0)
|
|
|| __builtin_expect (doacross->array == NULL, 0))
|
|
{
|
|
__sync_synchronize ();
|
|
return;
|
|
}
|
|
|
|
if (__builtin_expect (ws->sched == GFS_STATIC, 1))
|
|
{
|
|
if (ws->chunk_size_ull == 0)
|
|
{
|
|
if (first < doacross->boundary_ull)
|
|
ent = first / (doacross->q_ull + 1);
|
|
else
|
|
ent = (first - doacross->boundary_ull) / doacross->q_ull
|
|
+ doacross->t;
|
|
}
|
|
else
|
|
ent = first / ws->chunk_size_ull % thr->ts.team->nthreads;
|
|
}
|
|
else if (ws->sched == GFS_GUIDED)
|
|
ent = first;
|
|
else
|
|
ent = first / doacross->chunk_size_ull;
|
|
|
|
if (__builtin_expect (doacross->flattened, 1))
|
|
{
|
|
unsigned long *array = (unsigned long *) (doacross->array
|
|
+ ent * doacross->elt_sz);
|
|
gomp_ull flattened = first << doacross->shift_counts[0];
|
|
unsigned long cur;
|
|
|
|
va_start (ap, first);
|
|
for (i = 1; i < doacross->ncounts; i++)
|
|
flattened |= va_arg (ap, gomp_ull)
|
|
<< doacross->shift_counts[i];
|
|
cur = __atomic_load_n (array, MEMMODEL_ACQUIRE);
|
|
if (flattened < cur)
|
|
{
|
|
__atomic_thread_fence (MEMMODEL_RELEASE);
|
|
va_end (ap);
|
|
return;
|
|
}
|
|
doacross_spin (array, flattened, cur);
|
|
__atomic_thread_fence (MEMMODEL_RELEASE);
|
|
va_end (ap);
|
|
return;
|
|
}
|
|
|
|
if (sizeof (gomp_ull) == sizeof (unsigned long))
|
|
{
|
|
gomp_ull *array = (gomp_ull *) (doacross->array
|
|
+ ent * doacross->elt_sz);
|
|
do
|
|
{
|
|
va_start (ap, first);
|
|
for (i = 0; i < doacross->ncounts; i++)
|
|
{
|
|
gomp_ull thisv
|
|
= (i ? va_arg (ap, gomp_ull) : first) + 1;
|
|
gomp_ull cur = __atomic_load_n (&array[i], MEMMODEL_RELAXED);
|
|
if (thisv < cur)
|
|
{
|
|
i = doacross->ncounts;
|
|
break;
|
|
}
|
|
if (thisv > cur)
|
|
break;
|
|
}
|
|
va_end (ap);
|
|
if (i == doacross->ncounts)
|
|
break;
|
|
cpu_relax ();
|
|
}
|
|
while (1);
|
|
}
|
|
else
|
|
{
|
|
unsigned long *array = (unsigned long *) (doacross->array
|
|
+ ent * doacross->elt_sz);
|
|
do
|
|
{
|
|
va_start (ap, first);
|
|
for (i = 0; i < doacross->ncounts; i++)
|
|
{
|
|
gomp_ull thisv
|
|
= (i ? va_arg (ap, gomp_ull) : first) + 1;
|
|
unsigned long t
|
|
= thisv >> (__SIZEOF_LONG_LONG__ * __CHAR_BIT__ / 2);
|
|
unsigned long cur
|
|
= __atomic_load_n (&array[2 * i], MEMMODEL_RELAXED);
|
|
if (t < cur)
|
|
{
|
|
i = doacross->ncounts;
|
|
break;
|
|
}
|
|
if (t > cur)
|
|
break;
|
|
t = thisv;
|
|
cur = __atomic_load_n (&array[2 * i + 1], MEMMODEL_RELAXED);
|
|
if (t < cur)
|
|
{
|
|
i = doacross->ncounts;
|
|
break;
|
|
}
|
|
if (t > cur)
|
|
break;
|
|
}
|
|
va_end (ap);
|
|
if (i == doacross->ncounts)
|
|
break;
|
|
cpu_relax ();
|
|
}
|
|
while (1);
|
|
}
|
|
__sync_synchronize ();
|
|
}
|