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Annotation of OpenXM_contrib/gmp/mpz/fits_s.h, Revision 1.1.1.1

1.1       ohara       1: /* int mpz_fits_X_p (mpz_t z) -- test whether z fits signed type X.
                      2:
                      3: Copyright 1997, 2000, 2001, 2002 Free Software Foundation, Inc.
                      4:
                      5: This file is part of the GNU MP Library.
                      6:
                      7: The GNU MP Library is free software; you can redistribute it and/or modify
                      8: it under the terms of the GNU Lesser General Public License as published by
                      9: the Free Software Foundation; either version 2.1 of the License, or (at your
                     10: option) any later version.
                     11:
                     12: The GNU MP Library is distributed in the hope that it will be useful, but
                     13: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
                     14: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
                     15: License for more details.
                     16:
                     17: You should have received a copy of the GNU Lesser General Public License
                     18: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
                     19: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
                     20: MA 02111-1307, USA. */
                     21:
                     22: #include "gmp.h"
                     23: #include "gmp-impl.h"
                     24:
                     25:
                     26: int
                     27: FUNCTION (mpz_srcptr z)
                     28: {
                     29:   mp_size_t n = SIZ(z);
                     30:   mp_ptr p = PTR(z);
                     31:   mp_limb_t limb = p[0];
                     32:
                     33:   if (n == 0)
                     34:     return 1;
                     35:   if (n == 1)
                     36:     return limb <= MAXIMUM;
                     37:   if (n == -1)
                     38:     return limb <= - (mp_limb_t) MINIMUM;
                     39: #if GMP_NAIL_BITS != 0
                     40:   {
                     41:     if ((p[1] >> GMP_NAIL_BITS) == 0)
                     42:       {
                     43:        limb += p[1] << GMP_NUMB_BITS;
                     44:        if (n == 2)
                     45:          return limb <= MAXIMUM;
                     46:        if (n == -2)
                     47:          return limb <= - (mp_limb_t) MINIMUM;
                     48:       }
                     49:   }
                     50: #endif
                     51:   return 0;
                     52: }