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/* mpfr_set_machine_rnd_mode -- set the rounding mode for machine floats
Copyright 1999, 2001, 2002, 2006, 2007, 2008 Free Software Foundation, Inc.
Contributed by the Arenaire and Cacao projects, INRIA.
This file is part of the GNU MPFR Library.
The GNU MPFR 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 MPFR 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 MPFR Library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
MA 02110-1301, USA. */
#include "mpfr-test.h"
/* It is important to test each FE_* macro -- see the ISO C99 standard.
For instance, with some ARM implementations, only FE_TONEAREST may
be defined. */
/* sets the machine rounding mode to the value rnd_mode */
int
mpfr_set_machine_rnd_mode (mp_rnd_t rnd_mode)
{
switch (rnd_mode)
{
case GMP_RNDN:
return
#if defined (MPFR_HAVE_FESETROUND) && defined (FE_TONEAREST)
fesetround(FE_TONEAREST)
#else
-1
#endif
;
case GMP_RNDZ:
return
#if defined (MPFR_HAVE_FESETROUND) && defined (FE_TOWARDZERO)
fesetround(FE_TOWARDZERO)
#else
-1
#endif
;
case GMP_RNDU:
return
#if defined (MPFR_HAVE_FESETROUND) && defined (FE_UPWARD)
fesetround(FE_UPWARD)
#else
-1
#endif
;
case GMP_RNDD:
return
#if defined (MPFR_HAVE_FESETROUND) && defined (FE_DOWNWARD)
fesetround(FE_DOWNWARD)
#else
-1
#endif
;
default:
return -1;
}
}
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