/* Set current rounding direction.

   Copyright (C) 1997-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.

   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 <fenv.h>

#include <unistd.h>

#include <ldsodefs.h>

#include <dl-procinfo.h>

int

__fesetround (int round)

{

  unsigned short int cw;

  if ((round & ~0xc00) != 0)

    /* ROUND is no valid rounding mode.  */

    return 1;

  __asm__ ("fnstcw %0" : "=m" (*&cw);;

  cw &= ~0xc00;

  cw |= round;

  __asm__ ("fldcw %0" : : "m" (*&cw);;

  /* If the CPU supports SSE we set the MXCSR as well.  */

  if (CPU_FEATURE_USABLE (SSE))

    {

      unsigned int xcw;

      __asm__ ("stmxcsr %0" : "=m" (*&xcw));

      xcw &= ~0x6000;

      xcw |= round << 3;

      __asm__ ("ldmxcsr %0" : : "m" (*&xcw));

    }

  return 0;

}

libm_hidden_def (__fesetround)

weak_alias (__fesetround, fesetround)

libm_hidden_weak (fesetround)