140 lines
3.4 KiB
C
140 lines
3.4 KiB
C
/* Test mpn_sb_div_qr.
|
|
|
|
Copyright 2002 Free Software Foundation, Inc.
|
|
Copyright 2009 William Hart
|
|
|
|
This file is part of the MPIR Library.
|
|
|
|
The MPIR Library is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU Lesser General Public License as published by
|
|
the Free Software Foundation; either version 2.1 of the License, or (at your
|
|
option) any later version.
|
|
|
|
The MPIR Library is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
|
|
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
|
|
License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with the MPIR Library; see the file COPYING.LIB. If not, write to
|
|
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
|
|
MA 02110-1301, USA. */
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
|
|
#include "mpir.h"
|
|
#include "gmp-impl.h"
|
|
#include "longlong.h"
|
|
#include "tests.h"
|
|
|
|
#if defined(_MSC_VER) || defined(__MINGW32__)
|
|
#define random rand
|
|
#endif
|
|
|
|
#define MAX_LIMBS 40
|
|
#define ITERS 10000
|
|
|
|
/* Check schoolboy division routine. */
|
|
void
|
|
check_sb_div_qr (void)
|
|
{
|
|
mp_limb_t np[2*MAX_LIMBS];
|
|
mp_limb_t np2[2*MAX_LIMBS];
|
|
mp_limb_t rp[2*MAX_LIMBS+1];
|
|
mp_limb_t dp[MAX_LIMBS];
|
|
mp_limb_t qp[2*MAX_LIMBS];
|
|
mp_limb_t dip, cy;
|
|
|
|
mp_size_t nn, rn, dn, qn;
|
|
|
|
gmp_randstate_t rands;
|
|
|
|
int i, j, s;
|
|
gmp_randinit_default(rands);
|
|
|
|
for (i = 0; i < ITERS; i++)
|
|
{
|
|
dn = (random() % (MAX_LIMBS - 2)) + 3;
|
|
nn = (random() % MAX_LIMBS) + dn;
|
|
|
|
mpn_rrandom (np, rands, nn);
|
|
mpn_rrandom (dp, rands, dn);
|
|
dp[dn-1] |= GMP_LIMB_HIGHBIT;
|
|
|
|
MPN_COPY(np2, np, nn);
|
|
|
|
invert_1(dip, dp[dn - 1], dp[dn - 2]);
|
|
|
|
qn = nn - dn + 1;
|
|
|
|
qp[qn - 1] = mpn_sb_div_qr(qp, np, nn, dp, dn, dip);
|
|
|
|
MPN_NORMALIZE(qp, qn);
|
|
|
|
if (qn)
|
|
{
|
|
if (qn >= dn) mpn_mul(rp, qp, qn, dp, dn);
|
|
else mpn_mul(rp, dp, dn, qp, qn);
|
|
|
|
rn = dn + qn;
|
|
MPN_NORMALIZE(rp, rn);
|
|
|
|
if (rn > nn)
|
|
{
|
|
printf("failed: q*d has too many limbs\n");
|
|
abort();
|
|
}
|
|
|
|
if (mpn_cmp(rp, np2, nn) > 0)
|
|
{
|
|
printf("failed: remainder negative\n");
|
|
abort();
|
|
}
|
|
|
|
mpn_sub(rp, np2, nn, rp, rn);
|
|
rn = nn;
|
|
MPN_NORMALIZE(rp, rn);
|
|
} else
|
|
{
|
|
rn = nn;
|
|
MPN_COPY(rp, np, nn);
|
|
}
|
|
|
|
s = (rn < dn) ? -1 : (rn > dn) ? 1 : mpn_cmp(rp, dp, dn);
|
|
if (s >= 0)
|
|
{
|
|
printf ("failed:\n");
|
|
printf ("nn = %lu, dn = %lu, qn = %lu, rn = %lu\n\n", nn, dn, qn, rn);
|
|
gmp_printf (" np: %Nx\n\n", np2, nn);
|
|
gmp_printf (" dp: %Nx\n\n", dp, dn);
|
|
gmp_printf (" qp: %Nx\n\n", qp, qn);
|
|
gmp_printf (" rp: %Nx\n\n", rp, rn);
|
|
abort ();
|
|
}
|
|
|
|
if (mpn_cmp(rp, np, rn) != 0)
|
|
{
|
|
printf("failed: remainder does not match\n");
|
|
gmp_printf (" np: %Nx\n\n", np2, nn);
|
|
gmp_printf (" dp: %Nx\n\n", dp, dn);
|
|
gmp_printf (" qp: %Nx\n\n", qp, qn);
|
|
gmp_printf (" rp: %Nx\n\n", rp, rn);
|
|
gmp_printf (" rp2: %Nx\n\n", np, rn);
|
|
}
|
|
}
|
|
|
|
gmp_randclear(rands);
|
|
}
|
|
|
|
int
|
|
main (void)
|
|
{
|
|
tests_start ();
|
|
|
|
check_sb_div_qr ();
|
|
|
|
tests_end ();
|
|
exit (0);
|
|
}
|