mul_1.c
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上传日期:2022-08-06
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- /* mpn_mul_1 -- Multiply a limb vector with a single limb and store the
- product in a second limb vector.
- Copyright 1991, 1992, 1993, 1994, 1996, 2000, 2001, 2002 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"
- #include "longlong.h"
- #if GMP_NAIL_BITS == 0
- mp_limb_t
- mpn_mul_1 (mp_ptr rp, mp_srcptr up, mp_size_t n, mp_limb_t vl)
- {
- mp_limb_t ul, cl, hpl, lpl;
- ASSERT (n >= 1);
- ASSERT (MPN_SAME_OR_INCR_P (rp, up, n));
- cl = 0;
- do
- {
- ul = *up++;
- umul_ppmm (hpl, lpl, ul, vl);
- lpl += cl;
- cl = (lpl < cl) + hpl;
- *rp++ = lpl;
- }
- while (--n != 0);
- return cl;
- }
- #endif
- #if GMP_NAIL_BITS >= 1
- mp_limb_t
- mpn_mul_1 (mp_ptr rp, mp_srcptr up, mp_size_t n, mp_limb_t vl)
- {
- mp_limb_t shifted_vl, ul, lpl, hpl, prev_hpl, xw, cl, xl;
- ASSERT (n >= 1);
- ASSERT (MPN_SAME_OR_INCR_P (rp, up, n));
- ASSERT_MPN (up, n);
- ASSERT_LIMB (vl);
- shifted_vl = vl << GMP_NAIL_BITS;
- cl = 0;
- prev_hpl = 0;
- do
- {
- ul = *up++;
- umul_ppmm (hpl, lpl, ul, shifted_vl);
- lpl >>= GMP_NAIL_BITS;
- xw = prev_hpl + lpl + cl;
- cl = xw >> GMP_NUMB_BITS;
- xl = xw & GMP_NUMB_MASK;
- *rp++ = xl;
- prev_hpl = hpl;
- }
- while (--n != 0);
- return prev_hpl + cl;
- }
- #endif