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

1.1     ! ohara       1: /* mpz_add_ui, mpz_sub_ui -- Add or subtract an mpz_t and an unsigned
        !             2:    one-word integer.
        !             3:
        !             4: Copyright 1991, 1993, 1994, 1996, 1999, 2000, 2001, 2002 Free Software
        !             5: Foundation, Inc.
        !             6:
        !             7: This file is part of the GNU MP Library.
        !             8:
        !             9: The GNU MP Library is free software; you can redistribute it and/or modify
        !            10: it under the terms of the GNU Lesser General Public License as published by
        !            11: the Free Software Foundation; either version 2.1 of the License, or (at your
        !            12: option) any later version.
        !            13:
        !            14: The GNU MP Library is distributed in the hope that it will be useful, but
        !            15: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            16: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
        !            17: License for more details.
        !            18:
        !            19: You should have received a copy of the GNU Lesser General Public License
        !            20: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
        !            21: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
        !            22: MA 02111-1307, USA. */
        !            23:
        !            24: #include "gmp.h"
        !            25: #include "gmp-impl.h"
        !            26:
        !            27:
        !            28: #ifdef OPERATION_add_ui
        !            29: #define FUNCTION          mpz_add_ui
        !            30: #define FUNCTION2         mpz_add
        !            31: #define VARIATION_CMP     >=
        !            32: #define VARIATION_NEG
        !            33: #define VARIATION_UNNEG   -
        !            34: #endif
        !            35:
        !            36: #ifdef OPERATION_sub_ui
        !            37: #define FUNCTION          mpz_sub_ui
        !            38: #define FUNCTION2         mpz_sub
        !            39: #define VARIATION_CMP     <
        !            40: #define VARIATION_NEG     -
        !            41: #define VARIATION_UNNEG
        !            42: #endif
        !            43:
        !            44: #ifndef FUNCTION
        !            45: Error, need OPERATION_add_ui or OPERATION_sub_ui
        !            46: #endif
        !            47:
        !            48:
        !            49: void
        !            50: FUNCTION (mpz_ptr w, mpz_srcptr u, unsigned long int vval)
        !            51: {
        !            52:   mp_srcptr up;
        !            53:   mp_ptr wp;
        !            54:   mp_size_t usize, wsize;
        !            55:   mp_size_t abs_usize;
        !            56:
        !            57: #if GMP_NAIL_BITS != 0
        !            58:   if (vval > GMP_NUMB_MAX)
        !            59:     {
        !            60:       mpz_t v;
        !            61:       mp_limb_t vl[2];
        !            62:       PTR(v) = vl;
        !            63:       vl[0] = vval & GMP_NUMB_MASK;
        !            64:       vl[1] = vval >> GMP_NUMB_BITS;
        !            65:       SIZ(v) = 2;
        !            66:       FUNCTION2 (w, u, v);
        !            67:       return;
        !            68:     }
        !            69: #endif
        !            70:
        !            71:   usize = u->_mp_size;
        !            72:   abs_usize = ABS (usize);
        !            73:
        !            74:   /* If not space for W (and possible carry), increase space.  */
        !            75:   wsize = abs_usize + 1;
        !            76:   if (w->_mp_alloc < wsize)
        !            77:     _mpz_realloc (w, wsize);
        !            78:
        !            79:   /* These must be after realloc (U may be the same as W).  */
        !            80:   up = u->_mp_d;
        !            81:   wp = w->_mp_d;
        !            82:
        !            83:   if (abs_usize == 0)
        !            84:     {
        !            85:       wp[0] = vval;
        !            86:       w->_mp_size = VARIATION_NEG (vval != 0);
        !            87:       return;
        !            88:     }
        !            89:
        !            90:   if (usize VARIATION_CMP 0)
        !            91:     {
        !            92:       mp_limb_t cy;
        !            93:       cy = mpn_add_1 (wp, up, abs_usize, (mp_limb_t) vval);
        !            94:       wp[abs_usize] = cy;
        !            95:       wsize = VARIATION_NEG (abs_usize + cy);
        !            96:     }
        !            97:   else
        !            98:     {
        !            99:       /* The signs are different.  Need exact comparison to determine
        !           100:         which operand to subtract from which.  */
        !           101:       if (abs_usize == 1 && up[0] < vval)
        !           102:        {
        !           103:          wp[0] = vval - up[0];
        !           104:          wsize = VARIATION_NEG 1;
        !           105:        }
        !           106:       else
        !           107:        {
        !           108:          mpn_sub_1 (wp, up, abs_usize, (mp_limb_t) vval);
        !           109:          /* Size can decrease with at most one limb.  */
        !           110:          wsize = VARIATION_UNNEG (abs_usize - (wp[abs_usize - 1] == 0));
        !           111:        }
        !           112:     }
        !           113:
        !           114:   w->_mp_size = wsize;
        !           115: }