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974e12c1f0
Old version was 3.1.2 and is quite old: 2013-03-13 A lot has happened since then 4.0.1 is from 2018-02-07
71 lines
2.0 KiB
C
71 lines
2.0 KiB
C
/* mpfr_set_machine_rnd_mode -- set the rounding mode for machine floats
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Copyright 1999, 2001-2002, 2006-2018 Free Software Foundation, Inc.
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Contributed by the AriC and Caramba projects, INRIA.
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This file is part of the GNU MPFR Library.
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The GNU MPFR Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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The GNU MPFR Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the GNU MPFR Library; see the file COPYING.LESSER. If not, see
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http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
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51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
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#include "mpfr-test.h"
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/* It is important to test each FE_* macro -- see the ISO C99 standard.
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For instance, with some ARM implementations, only FE_TONEAREST may
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be defined. */
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/* sets the machine rounding mode to the value rnd_mode */
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int
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mpfr_set_machine_rnd_mode (mpfr_rnd_t rnd_mode)
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{
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switch (rnd_mode)
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{
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case MPFR_RNDN:
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return
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#if defined (MPFR_HAVE_FESETROUND) && defined (FE_TONEAREST)
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fesetround(FE_TONEAREST)
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#else
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-1
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#endif
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;
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case MPFR_RNDZ:
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return
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#if defined (MPFR_HAVE_FESETROUND) && defined (FE_TOWARDZERO)
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fesetround(FE_TOWARDZERO)
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#else
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-1
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#endif
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;
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case MPFR_RNDU:
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return
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#if defined (MPFR_HAVE_FESETROUND) && defined (FE_UPWARD)
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fesetround(FE_UPWARD)
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#else
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-1
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#endif
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;
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case MPFR_RNDD:
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return
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#if defined (MPFR_HAVE_FESETROUND) && defined (FE_DOWNWARD)
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fesetround(FE_DOWNWARD)
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#else
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-1
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#endif
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;
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default:
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return -1;
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}
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}
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