1  /* Set current rounding direction.
       2     Copyright (C) 1997-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library.  If not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <fenv.h>
      20  
      21  int
      22  __fesetround (int round)
      23  {
      24    fexcept_t fpcr;
      25  
      26    if (round & ~FE_UPWARD)
      27      /* ROUND is no valid rounding mode.  */
      28      return 1;
      29  
      30    __asm__ ("fmove%.l %!,%0" : "=dm" (fpcr));
      31    fpcr &= ~FE_UPWARD;
      32    fpcr |= round;
      33    __asm__ __volatile__ ("fmove%.l %0,%!" : : "dm" (fpcr));
      34  
      35    return 0;
      36  }
      37  libm_hidden_def (__fesetround)
      38  weak_alias (__fesetround, fesetround)
      39  libm_hidden_weak (fesetround)