80 lines
2.7 KiB
C
80 lines
2.7 KiB
C
/* Test mpn_redc_1
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Copyright 2009 Jason Moxham
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This file is part of the MPIR Library.
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The MPIR Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation; either version 2.1 of the License, or (at
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your option) any later version.
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The MPIR Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the MPIR Library; see the file COPYING.LIB. If not, write
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to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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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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#include "tests.h"
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/* Set cp[] <- tp[]/R^n mod mp[]. Clobber tp[].
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mp[] is n limbs; tp[] is 2n limbs. */
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void ref_redc_1 (mp_ptr cp, mp_ptr tp, mp_srcptr mp, mp_size_t n, mp_limb_t Nprim)
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{ mp_limb_t cy; mp_limb_t q; mp_size_t j;
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ASSERT_MPN (tp, 2*n);
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for (j = 0; j < n; j++)
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{ q = (tp[0] * Nprim) & GMP_NUMB_MASK;
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tp[0] = mpn_addmul_1 (tp, mp, n, q);
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tp++; }
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cy = mpn_add_n (cp, tp, tp - n, n);
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if (cy != 0) mpn_sub_n (cp, cp, mp, n);
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}
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int
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main (void)
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{
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gmp_randstate_t rands;
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int j,n;
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mp_limb_t cp1[1000], cp2[1000], mp[1000],tp1[1000],tp2[1000],inv;
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tests_start ();
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gmp_randinit_default(rands);
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for(n=1;n<100;n++)
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{for(j=1;j<100;j++)
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{mpn_randomb(mp,rands,n);mp[0]|=1;modlimb_invert(inv,mp[0]);inv=-inv;mpn_randomb(tp1,rands,2*n);
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MPN_COPY(tp2,tp1,2*n);
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ref_redc_1(cp1,tp1,mp,n,inv);
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mpn_redc_1(cp2,tp2,mp,n,inv);
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if(mpn_cmp(cp1,cp2,n)!=0){printf("mpn_redc_1 error %d\n",n);abort();}
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if(n!=1 && mpn_cmp(tp1,tp2,2*n)!=0){printf("mpn_redc_1 possible error\n");abort();}
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/* we dont require the above to be the same but it could be a useful test */
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}
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}
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for(n=1;n<100;n++)
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{for(j=1;j<100;j++)
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{mpn_rrandom(mp,rands,n);mp[0]|=1;modlimb_invert(inv,mp[0]);inv=-inv;mpn_rrandom(tp1,rands,2*n);
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MPN_COPY(tp2,tp1,2*n);
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ref_redc_1(cp1,tp1,mp,n,inv);
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mpn_redc_1(cp2,tp2,mp,n,inv);
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if(mpn_cmp(cp1,cp2,n)!=0){printf("mpn_redc_1 error %d\n",n);abort();}
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if(n!=1 && mpn_cmp(tp1,tp2,2*n)!=0){printf("mpn_redc_1 possible error\n");abort();}
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/* we dont require the above to be the same but it could be a useful test */
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}
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}
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gmp_randclear(rands);
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tests_end ();
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exit (0);
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}
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