diff options
Diffstat (limited to 'mpfr/div_2exp.c')
| -rw-r--r-- | mpfr/div_2exp.c | 29 |
1 files changed, 12 insertions, 17 deletions
diff --git a/mpfr/div_2exp.c b/mpfr/div_2exp.c index e518f6518..68284f0a4 100644 --- a/mpfr/div_2exp.c +++ b/mpfr/div_2exp.c @@ -1,20 +1,20 @@ /* mpfr_div_2exp -- divide a floating-point number by a power of two -Copyright (C) 1999 Free Software Foundation. +Copyright (C) 1999, 2001 Free Software Foundation, Inc. This file is part of the MPFR Library. The MPFR Library is free software; you can redistribute it and/or modify -it under the terms of the GNU Library General Public License as published by -the Free Software Foundation; either version 2 of the License, or (at your +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 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 Library General Public +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 Library General Public License +You should have received a copy of the GNU Lesser General Public License along with the MPFR Library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ @@ -25,20 +25,15 @@ MA 02111-1307, USA. */ #include "mpfr.h" #include "mpfr-impl.h" -void -#if __STDC__ +int mpfr_div_2exp (mpfr_ptr y, mpfr_srcptr x, unsigned long int n, mp_rnd_t rnd_mode) -#else -mpfr_div_2exp (y, x, n, rnd_mode) - mpfr_ptr y; - mpfr_srcptr x; - unsigned long int n; - mp_rnd_t rnd_mode; -#endif { + int inexact = 0; + /* Important particular case */ - if (y != x) mpfr_set(y, x, rnd_mode); - MPFR_EXP(y) -= n; - return; + if (y != x) + inexact = mpfr_set (y, x, rnd_mode); + return ((MPFR_EXP(y) -= n) < __mpfr_emin) + ? mpfr_set_underflow (y, rnd_mode, MPFR_SIGN(y)) : inexact; } |