122 lines
3.1 KiB
C
122 lines
3.1 KiB
C
/* Test mpn_divexact_fobm1
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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 <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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#define DISP(xp,xn) do{int __t;printf("%s=",#xp);for(__t=(xn)-1;__t>=0;__t--)printf("%lX ",(xp)[__t]);printf("\n");}while(0)
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int
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main (void)
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{
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unsigned long n, c,j;
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gmp_randstate_t rands;
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mp_limb_t xp[10000], qp[10000], tp[10000], r1, r2, i, f;
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tests_start ();
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gmp_randinit_default(rands);
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/*
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where (xp,n) = (qp,n)*f -ret*B^n and 0 <= ret < f
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B=2^GMP_NUMB_BITS where f divides B-1. This assumes
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we use a divexact algorithm, a bi-directional algorithm
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would give different results and so would a diveby3 type
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div without the correction
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*/
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for (i = 1; i < 10000; i += 2)
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{
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if (GMP_NUMB_MAX % i != 0)
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continue;
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f = i;
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for (j = 0; j < 2; j++)
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{
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f = GMP_NUMB_MAX / f;
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for (n = 1; n < 100; n++)
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{
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for (c = 0; c < 10; c++)
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{
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mpn_randomb (xp, rands,n);
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r1 = mpn_divexact_byfobm1 (qp, xp, n, f, GMP_NUMB_MAX / f);
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r2 = mpn_mul_1 (tp, qp, n, f);
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if (r1 != r2)
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{
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printf ("mpn_divexact_byfobm1 ret error\n");
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abort ();
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}
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if (mpn_cmp (xp, tp, n) != 0)
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{
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printf ("mpn_divexact_byfobm1 error\n");
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abort ();
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}
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}
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}
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for (n = 2; n < 100; n++)
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{
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for (c = 0; c < 10; c++)
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{
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mpn_randomb (xp, rands,n);
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xp[n] = mpn_mul_1 (xp, xp, n - 1, f);
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r1 = mpn_divexact_byfobm1 (qp, xp, n, f, GMP_NUMB_MAX / f);
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r2 = mpn_mul_1 (tp, qp, n, f);
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if (r1 != r2)
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{
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printf ("mpn_divexact_byfobm1 ret error\n");
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abort ();
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}
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if (mpn_cmp (xp, tp, n) != 0)
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{
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printf ("mpn_divexact_byfobm1 error\n");
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abort ();
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}
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}
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}
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for (n = 0; n < 100; n++)
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{
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umul_ppmm (xp[1], xp[0], f, n);
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r1 = mpn_divexact_byfobm1 (qp, xp, 2, f, GMP_NUMB_MAX / f);
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r2 = mpn_mul_1 (tp, qp, 2, f);
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if (r1 != r2)
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{
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printf ("mpn_divexact_byfobm1 ret error\n");
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abort ();
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}
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if (mpn_cmp (xp, tp, 2) != 0)
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{
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printf ("mpn_divexact_byfobm1 error\n");
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abort ();
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}
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}
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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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