submul_1.c
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上传日期:2022-08-06
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- /* mpn_submul_1 for Cray PVP.
- Copyright 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"
- mp_limb_t
- mpn_submul_1 (mp_ptr rp, mp_srcptr up, mp_size_t n, mp_limb_t limb)
- {
- mp_limb_t p0[n], p1[n], tp[n];
- mp_limb_t cy_limb;
- GMPN_MULWW (p1, p0, up, &n, &limb);
- cy_limb = mpn_sub_n (tp, rp, p0, n);
- rp[0] = tp[0];
- if (n != 1)
- cy_limb += mpn_sub_n (rp + 1, tp + 1, p1, n - 1);
- cy_limb += p1[n - 1];
- return cy_limb;
- }