/* mpf_fits_s*_p -- test whether an mpf fits a C signed type.
Copyright 2001, 2002, 2014 Free Software Foundation, Inc.
This file is part of the GNU MP Library.
The GNU MP Library is free software; you can redistribute it and/or modify
it under the terms of either:
* 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.
or
* the GNU General Public License as published by the Free Software
Foundation; either version 2 of the License, or (at your option) any
later version.
or both in parallel, as here.
The GNU MP 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 General Public License
for more details.
You should have received copies of the GNU General Public License and the
GNU Lesser General Public License along with the GNU MP Library. If not,
see https://www.gnu.org/licenses/. */
#include "gmp-impl.h"
/* Notice this is equivalent to mpz_set_f + mpz_fits_s*_p. */
int
FUNCTION (mpf_srcptr f) __GMP_NOTHROW
{
mp_size_t fs, fn;
mp_srcptr fp;
mp_exp_t exp;
mp_limb_t fl;
exp = EXP(f);
if (exp < 1)
return 1; /* -1 < f < 1 truncates to zero, so fits */
fs = SIZ (f);
fp = PTR(f);
fn = ABS (fs);
if (exp == 1)
{
fl = fp[fn-1];
}
#if GMP_NAIL_BITS != 0
else if (exp == 2 && MAXIMUM > GMP_NUMB_MAX)
{
fl = fp[fn-1];
if ((fl >> GMP_NAIL_BITS) != 0)
return 0;
fl = (fl << GMP_NUMB_BITS);
if (fn >= 2)
fl |= fp[fn-2];
}
#endif
else
return 0;
return fl <= (fs >= 0 ? (mp_limb_t) MAXIMUM : NEG_CAST (mp_limb_t, MINIMUM));
}