aors_ui.h
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上传日期:2022-08-06
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- /* mpz_add_ui, mpz_sub_ui -- Add or subtract an mpz_t and an unsigned
- one-word integer.
- Copyright 1991, 1993, 1994, 1996, 1999, 2000, 2001, 2002, 2004 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 OPERATION_add_ui
- #define FUNCTION mpz_add_ui
- #define FUNCTION2 mpz_add
- #define VARIATION_CMP >=
- #define VARIATION_NEG
- #define VARIATION_UNNEG -
- #endif
- #ifdef OPERATION_sub_ui
- #define FUNCTION mpz_sub_ui
- #define FUNCTION2 mpz_sub
- #define VARIATION_CMP <
- #define VARIATION_NEG -
- #define VARIATION_UNNEG
- #endif
- #ifndef FUNCTION
- Error, need OPERATION_add_ui or OPERATION_sub_ui
- #endif
- void
- FUNCTION (mpz_ptr w, mpz_srcptr u, unsigned long int vval)
- {
- mp_srcptr up;
- mp_ptr wp;
- mp_size_t usize, wsize;
- mp_size_t abs_usize;
- #if BITS_PER_ULONG > GMP_NUMB_BITS /* avoid warnings about shift amount */
- if (vval > GMP_NUMB_MAX)
- {
- mpz_t v;
- mp_limb_t vl[2];
- PTR(v) = vl;
- vl[0] = vval & GMP_NUMB_MASK;
- vl[1] = vval >> GMP_NUMB_BITS;
- SIZ(v) = 2;
- FUNCTION2 (w, u, v);
- return;
- }
- #endif
- usize = u->_mp_size;
- abs_usize = ABS (usize);
- /* 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 may be the same as W). */
- up = u->_mp_d;
- wp = w->_mp_d;
- if (abs_usize == 0)
- {
- wp[0] = vval;
- w->_mp_size = VARIATION_NEG (vval != 0);
- return;
- }
- if (usize VARIATION_CMP 0)
- {
- mp_limb_t cy;
- cy = mpn_add_1 (wp, up, abs_usize, (mp_limb_t) vval);
- wp[abs_usize] = cy;
- wsize = VARIATION_NEG (abs_usize + cy);
- }
- else
- {
- /* The signs are different. Need exact comparison to determine
- which operand to subtract from which. */
- if (abs_usize == 1 && up[0] < vval)
- {
- wp[0] = vval - up[0];
- wsize = VARIATION_NEG 1;
- }
- else
- {
- mpn_sub_1 (wp, up, abs_usize, (mp_limb_t) vval);
- /* Size can decrease with at most one limb. */
- wsize = VARIATION_UNNEG (abs_usize - (wp[abs_usize - 1] == 0));
- }
- }
- w->_mp_size = wsize;
- }