Return to cmp.c CVS log

Up to [local] / OpenXM_contrib / gmp / mpn / generic

Annotation of OpenXM_contrib/gmp/mpn/generic/cmp.c, Revision 1.1

1.1     ! maekawa     1: /* mpn_cmp -- Compare two low-level natural-number integers.
        !             2:
        !             3: Copyright (C) 1991, 1993, 1994, 1996 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: /* Compare OP1_PTR/OP1_SIZE with OP2_PTR/OP2_SIZE.
        !            26:    There are no restrictions on the relative sizes of
        !            27:    the two arguments.
        !            28:    Return 1 if OP1 > OP2, 0 if they are equal, and -1 if OP1 < OP2.  */
        !            29:
        !            30: int
        !            31: #if __STDC__
        !            32: mpn_cmp (mp_srcptr op1_ptr, mp_srcptr op2_ptr, mp_size_t size)
        !            33: #else
        !            34: mpn_cmp (op1_ptr, op2_ptr, size)
        !            35:      mp_srcptr op1_ptr;
        !            36:      mp_srcptr op2_ptr;
        !            37:      mp_size_t size;
        !            38: #endif
        !            39: {
        !            40:   mp_size_t i;
        !            41:   mp_limb_t op1_word, op2_word;
        !            42:
        !            43:   for (i = size - 1; i >= 0; i--)
        !            44:     {
        !            45:       op1_word = op1_ptr[i];
        !            46:       op2_word = op2_ptr[i];
        !            47:       if (op1_word != op2_word)
        !            48:        goto diff;
        !            49:     }
        !            50:   return 0;
        !            51:  diff:
        !            52:   /* This can *not* be simplified to
        !            53:        op2_word - op2_word
        !            54:      since that expression might give signed overflow.  */
        !            55:   return (op1_word > op2_word) ? 1 : -1;
        !            56: }