aors.h
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上传日期:2022-08-06
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- /* mpz_add, mpz_sub -- add or subtract integers.
- Copyright 1991, 1993, 1994, 1996, 2000, 2001 Free Software Foundation, Inc.
- This file is part of the GNU MP Library.
- The GNU MP Library is free software; you can redistribute it and/or modify
- it under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 3 of the License, or (at your
- option) any later version.
- The GNU MP Library is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
- License for more details.
- You should have received a copy of the GNU Lesser General Public License
- along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
- #include "gmp.h"
- #include "gmp-impl.h"
- #ifdef BERKELEY_MP
- #include "mp.h"
- #ifdef OPERATION_add
- #define FUNCTION madd
- #define VARIATION
- #endif
- #ifdef OPERATION_sub
- #define FUNCTION msub
- #define VARIATION -
- #endif
- #define ARGUMENTS mpz_srcptr u, mpz_srcptr v, mpz_ptr w
- #else /* normal GMP */
- #ifdef OPERATION_add
- #define FUNCTION mpz_add
- #define VARIATION
- #endif
- #ifdef OPERATION_sub
- #define FUNCTION mpz_sub
- #define VARIATION -
- #endif
- #define ARGUMENTS mpz_ptr w, mpz_srcptr u, mpz_srcptr v
- #endif
- #ifndef FUNCTION
- Error, need OPERATION_add or OPERATION_sub
- #endif
- void
- FUNCTION (ARGUMENTS)
- {
- mp_srcptr up, vp;
- mp_ptr wp;
- mp_size_t usize, vsize, wsize;
- mp_size_t abs_usize;
- mp_size_t abs_vsize;
- usize = u->_mp_size;
- vsize = VARIATION v->_mp_size;
- abs_usize = ABS (usize);
- abs_vsize = ABS (vsize);
- if (abs_usize < abs_vsize)
- {
- /* Swap U and V. */
- MPZ_SRCPTR_SWAP (u, v);
- MP_SIZE_T_SWAP (usize, vsize);
- MP_SIZE_T_SWAP (abs_usize, abs_vsize);
- }
- /* True: ABS_USIZE >= ABS_VSIZE. */
- /* If not space for w (and possible carry), increase space. */
- wsize = abs_usize + 1;
- if (w->_mp_alloc < wsize)
- _mpz_realloc (w, wsize);
- /* These must be after realloc (u or v may be the same as w). */
- up = u->_mp_d;
- vp = v->_mp_d;
- wp = w->_mp_d;
- if ((usize ^ vsize) < 0)
- {
- /* U and V have different sign. Need to compare them to determine
- which operand to subtract from which. */
- /* This test is right since ABS_USIZE >= ABS_VSIZE. */
- if (abs_usize != abs_vsize)
- {
- mpn_sub (wp, up, abs_usize, vp, abs_vsize);
- wsize = abs_usize;
- MPN_NORMALIZE (wp, wsize);
- if (usize < 0)
- wsize = -wsize;
- }
- else if (mpn_cmp (up, vp, abs_usize) < 0)
- {
- mpn_sub_n (wp, vp, up, abs_usize);
- wsize = abs_usize;
- MPN_NORMALIZE (wp, wsize);
- if (usize >= 0)
- wsize = -wsize;
- }
- else
- {
- mpn_sub_n (wp, up, vp, abs_usize);
- wsize = abs_usize;
- MPN_NORMALIZE (wp, wsize);
- if (usize < 0)
- wsize = -wsize;
- }
- }
- else
- {
- /* U and V have same sign. Add them. */
- mp_limb_t cy_limb = mpn_add (wp, up, abs_usize, vp, abs_vsize);
- wp[abs_usize] = cy_limb;
- wsize = abs_usize + cy_limb;
- if (usize < 0)
- wsize = -wsize;
- }
- w->_mp_size = wsize;
- }