126 lines
3.0 KiB
C
126 lines
3.0 KiB
C
/* Test mpn_inv_divappr_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 2000
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#define ITERS 2000
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/* Check divide and conquer division routine. */
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void
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check_inv_divappr_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[2*MAX_LIMBS];
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mp_limb_t dp[MAX_LIMBS];
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mp_limb_t qp[MAX_LIMBS];
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mp_limb_t dip[MAX_LIMBS];
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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 - 6)) + 6;
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nn = 2*dn;
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mpn_rrandom (np, rands, nn);
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mpn_rrandom (dp, rands, dn);
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dp[dn-1] |= GMP_LIMB_HIGHBIT;
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MPN_COPY(np2, np, nn);
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mpn_invert(dip, dp, dn);
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qn = nn - dn + 1;
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qp[qn - 1] = mpn_inv_divappr_q_n(qp, np, dp, dn, dip);
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MPN_NORMALIZE(qp, qn);
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if (qn)
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{
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if (qn >= dn) mpn_mul(rp, qp, qn, dp, dn);
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else mpn_mul(rp, dp, dn, qp, qn);
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rn = dn + qn;
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MPN_NORMALIZE(rp, rn);
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s = (rn < nn) ? -1 : (rn > nn) ? 1 : mpn_cmp(rp, np2, nn);
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if (s <= 0)
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{
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mpn_sub(rp, np2, nn, rp, rn);
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rn = nn;
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MPN_NORMALIZE(rp, rn);
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} else
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{
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mpn_sub(rp, rp, rn, np2, nn);
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MPN_NORMALIZE(rp, rn);
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}
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} else
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{
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rn = nn;
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MPN_COPY(rp, np, nn);
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}
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s = (rn < dn) ? -1 : (rn > dn) ? 1 : mpn_cmp(rp, dp, dn);
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if (s >= 0)
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{
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printf ("failed:\n");
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printf ("nn = %lu, dn = %lu, qn = %lu, rn = %lu\n\n", nn, dn, qn, rn);
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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, qn);
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gmp_printf (" rp: %Nx\n\n", rp, rn);
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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_inv_divappr_q_n ();
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tests_end ();
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exit (0);
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}
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