116 lines
2.8 KiB
C
116 lines
2.8 KiB
C
/* Test mpn_dc_bdiv_q_n.
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Copyright 2002 Free Software Foundation, Inc.
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Copyright 2009, 2010 William Hart
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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 by
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the Free Software Foundation; either version 2.1 of the License, or (at your
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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 to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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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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#if defined(_MSC_VER) || defined(__MINGW32__)
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#define random rand
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#endif
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#define MAX_LIMBS 400
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#define ITERS 10000
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/* Check divide and conquer hensel division routine. */
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void
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check_dc_bdiv_q_n (void)
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{
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mp_limb_t np[2*MAX_LIMBS];
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mp_limb_t np2[2*MAX_LIMBS];
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mp_limb_t rp[3*MAX_LIMBS];
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mp_limb_t dp[MAX_LIMBS];
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mp_limb_t qp[2*MAX_LIMBS];
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mp_limb_t wp[2];
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mp_limb_t tp[DC_BDIV_Q_N_ITCH(MAX_LIMBS)];
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mp_limb_t dip, cy, hi, lo;
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mp_size_t nn, rn, dn, qn;
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gmp_randstate_t rands;
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int i, j, s;
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gmp_randinit_default(rands);
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for (i = 0; i < ITERS; i++)
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{
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dn = (random() % (MAX_LIMBS - 5)) + 6;
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nn = dn;
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mpn_rrandom (np, rands, nn);
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mpn_rrandom (dp, rands, dn);
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dp[0] |= 1;
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MPN_COPY(np2, np, nn);
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modlimb_invert(dip, dp[0]);
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mpn_dc_bdiv_q_n(qp, wp, np, dp, dn, dip, tp);
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if (nn >= dn) mpn_mul(rp, qp, nn, dp, dn);
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else mpn_mul(rp, dp, dn, qp, nn);
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if (mpn_cmp(rp, np2, nn) != 0)
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{
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printf("failed: quotient wrong!\n");
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printf ("nn = %lu, dn = %lu\n\n", nn, dn);
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gmp_printf (" np: %Nx\n\n", np2, nn);
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gmp_printf (" dp: %Nx\n\n", dp, dn);
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gmp_printf (" qp: %Nx\n\n", qp, nn);
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gmp_printf (" rp: %Nx\n\n", rp, nn);
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abort ();
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}
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MPN_ZERO(rp, 3*MAX_LIMBS);
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hi = lo = 0;
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for (j = 0; j < dn; j++)
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{
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cy = mpn_addmul_1(rp + j, qp, nn - j, dp[j]);
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add_ssaaaa(hi, lo, hi, lo, 0, cy);
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}
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if ((hi != wp[1]) || (lo != wp[0]))
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{
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printf("failed: wp wrong!\n");
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printf("wp = %lx %lx, wp2 = %lx %lx\n", wp[1], wp[0], hi, lo);
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abort();
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}
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}
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gmp_randclear(rands);
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}
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int
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main (void)
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{
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tests_start ();
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check_dc_bdiv_q_n ();
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tests_end ();
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exit (0);
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}
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