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Annotation of OpenXM_contrib/gmp/mpf/cmp_ui.c, Revision 1.1

1.1     ! maekawa     1: /* mpf_cmp_ui -- Compare a float with an unsigned integer.
        !             2:
        !             3: Copyright (C) 1993, 1994, 1995 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 Library General Public License as published by
        !             9: the Free Software Foundation; either version 2 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 Library General Public
        !            15: License for more details.
        !            16:
        !            17: You should have received a copy of the GNU Library 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: int
        !            26: #if __STDC__
        !            27: mpf_cmp_ui (mpf_srcptr u, unsigned long int vlimb)
        !            28: #else
        !            29: mpf_cmp_ui (u, vlimb)
        !            30:      mpf_srcptr u;
        !            31:      unsigned long int vlimb;
        !            32: #endif
        !            33: {
        !            34:   mp_srcptr up;
        !            35:   mp_size_t usize;
        !            36:   mp_exp_t uexp;
        !            37:
        !            38:   uexp = u->_mp_exp;
        !            39:   usize = u->_mp_size;
        !            40:
        !            41:   /* 1. Is U negative?  */
        !            42:   if (usize < 0)
        !            43:     return -1;
        !            44:   /* We rely on usize being non-negative in the code that follows.  */
        !            45:
        !            46:   if (vlimb == 0)
        !            47:     return usize != 0;
        !            48:
        !            49:   /* 2. Are the exponents different (V's exponent == 1)?  */
        !            50:   if (uexp > 1)
        !            51:     return 1;
        !            52:   if (uexp < 1)
        !            53:     return -1;
        !            54:
        !            55:   up = u->_mp_d;
        !            56:
        !            57: #define STRICT_MPF_NORMALIZATION 0
        !            58: #if ! STRICT_MPF_NORMALIZATION
        !            59:   /* Ignore zeroes at the low end of U.  */
        !            60:   while (*up == 0)
        !            61:     {
        !            62:       up++;
        !            63:       usize--;
        !            64:     }
        !            65: #endif
        !            66:
        !            67:   /* 3. Now, if the number of limbs are different, we have a difference
        !            68:      since we have made sure the trailing limbs are not zero.  */
        !            69:   if (usize > 1)
        !            70:     return 1;
        !            71:
        !            72:   /* 4. Compare the mantissas.  */
        !            73:   if (*up > vlimb)
        !            74:     return 1;
        !            75:   else if (*up < vlimb)
        !            76:     return -1;
        !            77:
        !            78:   /* Wow, we got zero even if we tried hard to avoid it.  */
        !            79:   return 0;
        !            80: }