diff options
Diffstat (limited to 'Build/source/libs/mpfr/mpfr-src/src/div_2si.c')
-rw-r--r-- | Build/source/libs/mpfr/mpfr-src/src/div_2si.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/Build/source/libs/mpfr/mpfr-src/src/div_2si.c b/Build/source/libs/mpfr/mpfr-src/src/div_2si.c new file mode 100644 index 00000000000..c7da6a05849 --- /dev/null +++ b/Build/source/libs/mpfr/mpfr-src/src/div_2si.c @@ -0,0 +1,60 @@ +/* mpfr_div_2si -- divide a floating-point number by a power of two + +Copyright 1999, 2001-2015 Free Software Foundation, Inc. +Contributed by the AriC and Caramel 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 3 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.LESSER. If not, see +http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc., +51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */ + +#include "mpfr-impl.h" + +int +mpfr_div_2si (mpfr_ptr y, mpfr_srcptr x, long int n, mpfr_rnd_t rnd_mode) +{ + int inexact; + + MPFR_LOG_FUNC + (("x[%Pu]=%.*Rg n=%ld rnd=%d", + mpfr_get_prec(x), mpfr_log_prec, x, n, rnd_mode), + ("y[%Pu]=%.*Rg inexact=%d", + mpfr_get_prec(y), mpfr_log_prec, y, inexact)); + + if (MPFR_UNLIKELY (MPFR_IS_SINGULAR (x))) + return mpfr_set (y, x, rnd_mode); + else + { + mpfr_exp_t exp = MPFR_GET_EXP (x); + MPFR_SETRAW (inexact, y, x, exp, rnd_mode); + if (MPFR_UNLIKELY( n > 0 && (__gmpfr_emin > MPFR_EMAX_MAX - n || + exp < __gmpfr_emin + n)) ) + { + if (rnd_mode == MPFR_RNDN && + (__gmpfr_emin > MPFR_EMAX_MAX - (n - 1) || + exp < __gmpfr_emin + (n - 1) || + (inexact >= 0 && mpfr_powerof2_raw (y)))) + rnd_mode = MPFR_RNDZ; + return mpfr_underflow (y, rnd_mode, MPFR_SIGN(y)); + } + else if (MPFR_UNLIKELY(n < 0 && (__gmpfr_emax < MPFR_EMIN_MIN - n || + exp > __gmpfr_emax + n)) ) + return mpfr_overflow (y, rnd_mode, MPFR_SIGN(y)); + + MPFR_SET_EXP (y, exp - n); + } + + MPFR_RET (inexact); +} |