diff options
Diffstat (limited to 'Build/source/libs/mpfr/mpfr-src/src/set_prec.c')
-rw-r--r-- | Build/source/libs/mpfr/mpfr-src/src/set_prec.c | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/Build/source/libs/mpfr/mpfr-src/src/set_prec.c b/Build/source/libs/mpfr/mpfr-src/src/set_prec.c new file mode 100644 index 00000000000..e9ea33dcc5f --- /dev/null +++ b/Build/source/libs/mpfr/mpfr-src/src/set_prec.c @@ -0,0 +1,55 @@ +/* mpfr_set_prec -- reset the precision of a floating-point number + +Copyright 1999, 2001-2002, 2004, 2006-2015 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" + +void +mpfr_set_prec (mpfr_ptr x, mpfr_prec_t p) +{ + mp_size_t xsize, xoldsize; + mpfr_limb_ptr tmp; + + /* first, check if p is correct */ + MPFR_ASSERTN (p >= MPFR_PREC_MIN && p <= MPFR_PREC_MAX); + + /* Calculate the new number of limbs */ + xsize = MPFR_PREC2LIMBS (p); + + /* Realloc only if the new size is greater than the old */ + xoldsize = MPFR_GET_ALLOC_SIZE (x); + if (xsize > xoldsize) + { + tmp = (mpfr_limb_ptr) (*__gmp_reallocate_func) + (MPFR_GET_REAL_PTR(x), MPFR_MALLOC_SIZE(xoldsize), MPFR_MALLOC_SIZE(xsize)); + MPFR_SET_MANT_PTR(x, tmp); + MPFR_SET_ALLOC_SIZE(x, xsize); + } + MPFR_PREC (x) = p; + MPFR_SET_NAN (x); /* initializes to NaN */ +} + +#undef mpfr_get_prec +mpfr_prec_t +mpfr_get_prec (mpfr_srcptr x) +{ + return MPFR_PREC(x); +} |