diff options
Diffstat (limited to 'Build/source/libs/mpfr/mpfr-src/src/isinteger.c')
-rw-r--r-- | Build/source/libs/mpfr/mpfr-src/src/isinteger.c | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/Build/source/libs/mpfr/mpfr-src/src/isinteger.c b/Build/source/libs/mpfr/mpfr-src/src/isinteger.c new file mode 100644 index 00000000000..335babff4a8 --- /dev/null +++ b/Build/source/libs/mpfr/mpfr-src/src/isinteger.c @@ -0,0 +1,59 @@ +/* mpfr_integer_p -- test if a mpfr variable is integer. + +Copyright 2001-2004, 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" + +int +mpfr_integer_p (mpfr_srcptr x) +{ + mpfr_exp_t expo; + mpfr_prec_t prec; + mp_size_t xn; + mp_limb_t *xp; + + if (MPFR_UNLIKELY( MPFR_IS_SINGULAR(x))) + return (MPFR_IS_ZERO(x)); + + expo = MPFR_GET_EXP (x); + if (expo <= 0) + return 0; + + prec = MPFR_PREC(x); + if ((mpfr_uexp_t) expo >= (mpfr_uexp_t) prec) + return 1; + + /* 0 < expo < prec */ + + xn = (mp_size_t) ((prec - 1) / GMP_NUMB_BITS); /* index of last limb */ + xn -= (mp_size_t) (expo / GMP_NUMB_BITS); + /* now the index of the last limb containing bits of the fractional part */ + + xp = MPFR_MANT(x); + MPFR_ASSERTN(xn >= 0); + if (xp[xn] << (expo % GMP_NUMB_BITS) != 0) + return 0; + while (--xn >= 0) + if (xp[xn] != 0) + return 0; + return 1; +} |