/* CPU strand yielding for busy loops.  Linux/sparc64 version.

   Copyright (C) 2017-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <sparc-ifunc.h>

static void

__cpu_relax_generic (void)

{

  asm volatile ("rd %ccr, %g0;"

		"rd %ccr, %g0;"

		"rd %ccr, %g0");

}

static void

__cpu_relax_pause (void)

{

  asm volatile ("wr %g0, 128, %asr27");

}

sparc_libc_ifunc (__cpu_relax,

		  hwcap & HWCAP_SPARC_PAUSE

		  ? __cpu_relax_pause

		  : __cpu_relax_generic)