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/* mpfr_min_prec -- minimal size in bits to hold the mantissa
Copyright 2009-2020 Free Software Foundation, Inc.
Contributed by the AriC and Caramba 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
https://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"
mpfr_prec_t
mpfr_min_prec (mpfr_srcptr x)
{
if (MPFR_UNLIKELY (MPFR_IS_SINGULAR (x)))
return 0;
/* from a suggestion by Andreas Enge (2010-11-18) */
return MPFR_LIMB_SIZE (x) * GMP_NUMB_BITS - mpn_scan1 (MPFR_MANT (x), 0);
}
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