1/* int mpz_fits_X_p (mpz_t z) -- test whether z fits signed type X.
2
3Copyright 1997, 2000, 2001, 2002 Free Software Foundation, Inc.
4
5This file is part of the GNU MP Library.
6
7The GNU MP Library is free software; you can redistribute it and/or modify
8it under the terms of the GNU Lesser General Public License as published by
9the Free Software Foundation; either version 3 of the License, or (at your
10option) any later version.
11
12The GNU MP Library is distributed in the hope that it will be useful, but
13WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
15License for more details.
16
17You should have received a copy of the GNU Lesser General Public License
18along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.  */
19
20#include "gmp.h"
21#include "gmp-impl.h"
22
23
24int
25FUNCTION (mpz_srcptr z) __GMP_NOTHROW
26{
27  mp_size_t n = SIZ(z);
28  mp_ptr p = PTR(z);
29  mp_limb_t limb = p[0];
30
31  if (n == 0)
32    return 1;
33  if (n == 1)
34    return limb <= MAXIMUM;
35  if (n == -1)
36    return limb <= - (mp_limb_t) MINIMUM;
37#if GMP_NAIL_BITS != 0
38  {
39    if ((p[1] >> GMP_NAIL_BITS) == 0)
40      {
41	limb += p[1] << GMP_NUMB_BITS;
42	if (n == 2)
43	  return limb <= MAXIMUM;
44	if (n == -2)
45	  return limb <= - (mp_limb_t) MINIMUM;
46      }
47  }
48#endif
49  return 0;
50}
51