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Annotation of OpenXM_contrib/gmp/mpf/fits_s.h, Revision 1.1

1.1     ! ohara       1: /* mpf_fits_s*_p -- test whether an mpf fits a C signed type.
        !             2:
        !             3: Copyright 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: /* Notice this is equivalent to mpz_set_f + mpz_fits_s*_p.  */
        !            27:
        !            28: int
        !            29: FUNCTION (mpf_srcptr f)
        !            30: {
        !            31:   mp_size_t  fs, fn;
        !            32:   mp_srcptr  fp;
        !            33:   mp_exp_t   exp;
        !            34:   mp_limb_t  fl;
        !            35:
        !            36:   fs = SIZ(f);
        !            37:   if (fs == 0)
        !            38:     return 1;  /* zero fits */
        !            39:
        !            40:   exp = EXP(f);
        !            41:   if (exp < 1)
        !            42:     return 1;  /* -1 < f < 1 truncates to zero, so fits */
        !            43:
        !            44:   fp = PTR(f);
        !            45:   fn = ABS (fs);
        !            46:
        !            47:   if (exp == 1)
        !            48:     {
        !            49:       fl = fp[fn-1];
        !            50:     }
        !            51: #if GMP_NAIL_BITS != 0
        !            52:   else if (exp == 2 && MAXIMUM > GMP_NUMB_MAX)
        !            53:     {
        !            54:       fl = fp[fn-1];
        !            55:       if ((fl >> GMP_NAIL_BITS) != 0)
        !            56:        return 0;
        !            57:       fl = (fl << GMP_NUMB_BITS);
        !            58:       if (fn >= 2)
        !            59:         fl |= fp[fn-2];
        !            60:     }
        !            61: #endif
        !            62:   else
        !            63:     return 0;
        !            64:
        !            65:   return fl <= (fs >= 0 ? (mp_limb_t) MAXIMUM : - (mp_limb_t) MINIMUM);
        !            66: }