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Diffstat (limited to 'Build/source/libs/mpfr/mpfr-3.1.2/src/get_z.c')
-rw-r--r-- | Build/source/libs/mpfr/mpfr-3.1.2/src/get_z.c | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/Build/source/libs/mpfr/mpfr-3.1.2/src/get_z.c b/Build/source/libs/mpfr/mpfr-3.1.2/src/get_z.c new file mode 100644 index 00000000000..13a2e9960d9 --- /dev/null +++ b/Build/source/libs/mpfr/mpfr-3.1.2/src/get_z.c @@ -0,0 +1,61 @@ +/* mpfr_get_z -- get a multiple-precision integer from + a floating-point number + +Copyright 2004, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 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_get_z (mpz_ptr z, mpfr_srcptr f, mpfr_rnd_t rnd) +{ + int inex; + mpfr_t r; + mpfr_exp_t exp; + + if (MPFR_UNLIKELY (MPFR_IS_SINGULAR (f))) + { + if (MPFR_UNLIKELY (MPFR_NOTZERO (f))) + MPFR_SET_ERANGE (); + mpz_set_ui (z, 0); + /* The ternary value is 0 even for infinity. Giving the rounding + direction in this case would not make much sense anyway, and + the direction would not necessarily match rnd. */ + return 0; + } + + exp = MPFR_GET_EXP (f); + /* if exp <= 0, then |f|<1, thus |o(f)|<=1 */ + MPFR_ASSERTN (exp < 0 || exp <= MPFR_PREC_MAX); + mpfr_init2 (r, (exp < (mpfr_exp_t) MPFR_PREC_MIN ? + MPFR_PREC_MIN : (mpfr_prec_t) exp)); + inex = mpfr_rint (r, f, rnd); + MPFR_ASSERTN (inex != 1 && inex != -1); /* integral part of f is + representable in r */ + MPFR_ASSERTN (MPFR_IS_FP (r)); + exp = mpfr_get_z_2exp (z, r); + if (exp >= 0) + mpz_mul_2exp (z, z, exp); + else + mpz_fdiv_q_2exp (z, z, -exp); + mpfr_clear (r); + + return inex; +} |