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      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 }
     71