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Annotation of OpenXM_contrib/gmp/mpz/aors.h, Revision 1.1

1.1     ! ohara       1: /* mpz_add, mpz_sub -- add or subtract integers.
        !             2:
        !             3: Copyright 1991, 1993, 1994, 1996, 2000, 2001 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: #ifdef BERKELEY_MP
        !            27:
        !            28: #include "mp.h"
        !            29: #ifdef OPERATION_add
        !            30: #define FUNCTION     madd
        !            31: #define VARIATION
        !            32: #endif
        !            33: #ifdef OPERATION_sub
        !            34: #define FUNCTION     msub
        !            35: #define VARIATION    -
        !            36: #endif
        !            37: #define ARGUMENTS    mpz_srcptr u, mpz_srcptr v, mpz_ptr w
        !            38:
        !            39: #else /* normal GMP */
        !            40:
        !            41: #ifdef OPERATION_add
        !            42: #define FUNCTION     mpz_add
        !            43: #define VARIATION
        !            44: #endif
        !            45: #ifdef OPERATION_sub
        !            46: #define FUNCTION     mpz_sub
        !            47: #define VARIATION    -
        !            48: #endif
        !            49: #define ARGUMENTS    mpz_ptr w, mpz_srcptr u, mpz_srcptr v
        !            50:
        !            51: #endif
        !            52:
        !            53: #ifndef FUNCTION
        !            54: Error, need OPERATION_add or OPERATION_sub
        !            55: #endif
        !            56:
        !            57:
        !            58: void
        !            59: FUNCTION (ARGUMENTS)
        !            60: {
        !            61:   mp_srcptr up, vp;
        !            62:   mp_ptr wp;
        !            63:   mp_size_t usize, vsize, wsize;
        !            64:   mp_size_t abs_usize;
        !            65:   mp_size_t abs_vsize;
        !            66:
        !            67:   usize = u->_mp_size;
        !            68:   vsize = VARIATION v->_mp_size;
        !            69:   abs_usize = ABS (usize);
        !            70:   abs_vsize = ABS (vsize);
        !            71:
        !            72:   if (abs_usize < abs_vsize)
        !            73:     {
        !            74:       /* Swap U and V. */
        !            75:       MPZ_SRCPTR_SWAP (u, v);
        !            76:       MP_SIZE_T_SWAP (usize, vsize);
        !            77:       MP_SIZE_T_SWAP (abs_usize, abs_vsize);
        !            78:     }
        !            79:
        !            80:   /* True: ABS_USIZE >= ABS_VSIZE.  */
        !            81:
        !            82:   /* If not space for w (and possible carry), increase space.  */
        !            83:   wsize = abs_usize + 1;
        !            84:   if (w->_mp_alloc < wsize)
        !            85:     _mpz_realloc (w, wsize);
        !            86:
        !            87:   /* These must be after realloc (u or v may be the same as w).  */
        !            88:   up = u->_mp_d;
        !            89:   vp = v->_mp_d;
        !            90:   wp = w->_mp_d;
        !            91:
        !            92:   if ((usize ^ vsize) < 0)
        !            93:     {
        !            94:       /* U and V have different sign.  Need to compare them to determine
        !            95:         which operand to subtract from which.  */
        !            96:
        !            97:       /* This test is right since ABS_USIZE >= ABS_VSIZE.  */
        !            98:       if (abs_usize != abs_vsize)
        !            99:        {
        !           100:          mpn_sub (wp, up, abs_usize, vp, abs_vsize);
        !           101:          wsize = abs_usize;
        !           102:          MPN_NORMALIZE (wp, wsize);
        !           103:          if (usize < 0)
        !           104:            wsize = -wsize;
        !           105:        }
        !           106:       else if (mpn_cmp (up, vp, abs_usize) < 0)
        !           107:        {
        !           108:          mpn_sub_n (wp, vp, up, abs_usize);
        !           109:          wsize = abs_usize;
        !           110:          MPN_NORMALIZE (wp, wsize);
        !           111:          if (usize >= 0)
        !           112:            wsize = -wsize;
        !           113:        }
        !           114:       else
        !           115:        {
        !           116:          mpn_sub_n (wp, up, vp, abs_usize);
        !           117:          wsize = abs_usize;
        !           118:          MPN_NORMALIZE (wp, wsize);
        !           119:          if (usize < 0)
        !           120:            wsize = -wsize;
        !           121:        }
        !           122:     }
        !           123:   else
        !           124:     {
        !           125:       /* U and V have same sign.  Add them.  */
        !           126:       mp_limb_t cy_limb = mpn_add (wp, up, abs_usize, vp, abs_vsize);
        !           127:       wp[abs_usize] = cy_limb;
        !           128:       wsize = abs_usize + cy_limb;
        !           129:       if (usize < 0)
        !           130:        wsize = -wsize;
        !           131:     }
        !           132:
        !           133:   w->_mp_size = wsize;
        !           134: }