xref: /src/external/gpl3/gcc/dist/libgomp/config/nvptx/target.c

/* Copyright (C) 2013-2017 Free Software Foundation, Inc.
   Contributed by Jakub Jelinek <jakub (at) redhat.com>.

   This file is part of the GNU Offloading and Multi Processing 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/>.  */

#include "libgomp.h"
#include <limits.h>

void
GOMP_teams (unsigned int num_teams, unsigned int thread_limit)
{
  if (thread_limit)
    {
      struct gomp_task_icv *icv = gomp_icv (true);
      icv->thread_limit_var
	= thread_limit > INT_MAX ? UINT_MAX : thread_limit;
    }
  unsigned int num_blocks, block_id;
  asm ("mov.u32 %0, %%nctaid.x;" : "=r" (num_blocks));
  asm ("mov.u32 %0, %%ctaid.x;" : "=r" (block_id));
  if (!num_teams || num_teams >= num_blocks)
    num_teams = num_blocks;
  else if (block_id >= num_teams)
    {
      gomp_free_thread (nvptx_thrs);
      asm ("exit;");
    }
  gomp_num_teams_var = num_teams - 1;
}