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/* mpf_fits_s*_p -- test whether an mpf fits a C signed type.
Copyright 2001, 2002 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 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 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 Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the GNU MP Library. If not, see https://www.gnu.org/licenses/. */
#include "gmp.h"
#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;
fs = SIZ(f);
if (fs == 0)
return 1; /* zero fits */
exp = EXP(f);
if (exp < 1)
return 1; /* -1 < f < 1 truncates to zero, so fits */
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 : - (mp_limb_t) MINIMUM);
}
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