54 lines
1.7 KiB
C
54 lines
1.7 KiB
C
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/*
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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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void mpn_mod_1_2(mp_ptr rem,mp_srcptr xp,mp_size_t xn,mp_srcptr db)// in each round we hack off a limb from the body , ie k=1
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{mp_limb_t h,l,sh,sl,th,tl;
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mp_size_t j;
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ASSERT(xn>=4);
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ASSERT_MPN(xp,xn);
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ASSERT_LIMB(db[0]);ASSERT_LIMB(db[1]);ASSERT_LIMB(db[2]);
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tl=xp[xn-2];th=xp[xn-1];
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for(j=xn-4;j>=0;j-=2)
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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,tl,db[1]);
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add_ssaaaa(sh,sl,sh,sl,h,l);
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umul_ppmm(th,tl,th,db[2]);
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add_ssaaaa(th,tl,th,tl,sh,sl);}
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if(j>-2)// we have at least three limbs to do still ie xp[0],...,tl,th
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{umul_ppmm(sh,sl,tl,db[0]);
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add_ssaaaa(sh,sl,sh,sl,0,xp[0]);
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umul_ppmm(th,tl,th,db[1]);
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add_ssaaaa(th,tl,th,tl,sh,sl);}
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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;rem[1]=h;
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return;}
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