/* Set current rounding direction.

   Copyright (C) 2001-2018 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 <fenv.h>

int

__fesetround (int round)

{

  unsigned short int cw;

  int mxcsr;

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

    /* ROUND is no valid rounding mode.  */

    return 1;

  /* First set the x87 FPU.  */

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

  cw &= ~0xc00;

  cw |= round;

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

  /* And now the MSCSR register for SSE, the precision is at different bit

     positions in the different units, we need to shift it 3 bits.  */

  asm ("stmxcsr %0" : "=m" (*&mxcsr));

  mxcsr &= ~ 0x6000;

  mxcsr |= round << 3;

  asm ("ldmxcsr %0" : : "m" (*&mxcsr));

  return 0;

}

libm_hidden_def (__fesetround)

weak_alias (__fesetround, fesetround)

libm_hidden_weak (fesetround)