81 lines
2.2 KiB
C
81 lines
2.2 KiB
C
/*
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dnl Copyright 2009 Jason Moxham
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dnl This file is part of the MPIR Library.
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dnl The MPIR Library is free software; you can redistribute it and/or modify
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dnl it under the terms of the GNU Lesser General Public License as published
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dnl by the Free Software Foundation; either version 2.1 of the License, or (at
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dnl your option) any later version.
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dnl The MPIR Library is distributed in the hope that it will be useful, but
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dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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dnl License for more details.
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dnl You should have received a copy of the GNU Lesser General Public License
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dnl along with the MPIR Library; see the file COPYING.LIB. If not, write
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dnl to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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dnl Boston, MA 02110-1301, USA.
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*/
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#include "mpir.h"
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#include "gmp-impl.h"
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#include "longlong.h"
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/* in each round we remove one limb from the body, i.e. k = 1 */
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void mpn_mod_1_3(mp_ptr rem, mp_srcptr xp, mp_size_t xn, mp_srcptr db)
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{
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mp_limb_t h, l, sh, sl, th, tl;
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mp_size_t j, jj;
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ASSERT(xn >= 5);
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ASSERT_MPN(xp, xn);
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ASSERT_LIMB(db[0]);
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ASSERT_LIMB(db[1]);
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ASSERT_LIMB(db[2]);
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ASSERT_LIMB(db[3]);
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tl = xp[xn - 2];
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th = xp[xn - 1];
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for (j = xn - 5; j >= 0; j -= 3)
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{
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umul_ppmm(sh, sl, xp[j + 1], db[0]);
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add_ssaaaa(sh, sl, sh, sl, 0, xp[j]);
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umul_ppmm(h, l, xp[j + 2], db[1]);
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add_ssaaaa(sh, sl, sh, sl, h, l);
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umul_ppmm(h, l, tl, db[2]);
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add_ssaaaa(sh, sl, sh, sl, h, l);
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umul_ppmm(th, tl, th, db[3]);
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add_ssaaaa(th, tl, th, tl, sh, sl);
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}
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if (j > -3) /* we have at least three limbs to do, i.e. xp[0], ..., tl, th */
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{
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sh = 0;
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sl = xp[0];
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jj = 1;
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if (j == -1)
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{
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umul_ppmm(sh, sl, xp[1], db[0]);
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add_ssaaaa(sh, sl, sh, sl, 0, xp[0]);
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jj = 2;
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}
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umul_ppmm(h, l, tl, db[jj - 1]);
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add_ssaaaa(sh, sl, sh, sl, h, l);
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umul_ppmm(th, tl, th, db[jj]);
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add_ssaaaa(th, tl, th, tl, sh, sl);
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}
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umul_ppmm(h, l, th, db[0]);
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add_ssaaaa(h, l, h, l, 0, tl);
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rem[0] = l;
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rem[1] = h;
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}
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