1  /* mpfr_set_machine_rnd_mode -- set the rounding mode for machine floats
       2  
       3  Copyright 1999, 2001-2002, 2006-2023 Free Software Foundation, Inc.
       4  Contributed by the AriC and Caramba projects, INRIA.
       5  
       6  This file is part of the GNU MPFR Library.
       7  
       8  The GNU MPFR Library is free software; you can redistribute it and/or modify
       9  it under the terms of the GNU Lesser General Public License as published by
      10  the Free Software Foundation; either version 3 of the License, or (at your
      11  option) any later version.
      12  
      13  The GNU MPFR Library is distributed in the hope that it will be useful, but
      14  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
      15  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
      16  License for more details.
      17  
      18  You should have received a copy of the GNU Lesser General Public License
      19  along with the GNU MPFR Library; see the file COPYING.LESSER.  If not, see
      20  https://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
      21  51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
      22  
      23  #include "mpfr-test.h"
      24  
      25  /* It is important to test each FE_* macro -- see the ISO C99 standard.
      26     For instance, with some ARM implementations, only FE_TONEAREST may
      27     be defined. */
      28  
      29  /* sets the machine rounding mode to the value rnd_mode */
      30  int
      31  mpfr_set_machine_rnd_mode (mpfr_rnd_t rnd_mode)
      32  {
      33    switch (rnd_mode)
      34      {
      35      case MPFR_RNDN:
      36        return
      37  #if defined (MPFR_HAVE_FESETROUND) && defined (FE_TONEAREST)
      38          fesetround(FE_TONEAREST)
      39  #else
      40          -1
      41  #endif
      42          ;
      43      case MPFR_RNDZ:
      44        return
      45  #if defined (MPFR_HAVE_FESETROUND) && defined (FE_TOWARDZERO)
      46          fesetround(FE_TOWARDZERO)
      47  #else
      48          -1
      49  #endif
      50          ;
      51      case MPFR_RNDU:
      52        return
      53  #if defined (MPFR_HAVE_FESETROUND) && defined (FE_UPWARD)
      54          fesetround(FE_UPWARD)
      55  #else
      56          -1
      57  #endif
      58          ;
      59      case MPFR_RNDD:
      60        return
      61  #if defined (MPFR_HAVE_FESETROUND) && defined (FE_DOWNWARD)
      62          fesetround(FE_DOWNWARD)
      63  #else
      64          -1
      65  #endif
      66          ;
      67      default:
      68        return -1;
      69      }
      70  }