112 lines
2.6 KiB
C
112 lines
2.6 KiB
C
/*
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Copyright 2012, 2014, 2016, Free Software Foundation, Inc.
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This file is part of the GNU MP Library test suite.
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The GNU MP Library test suite is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 3 of the License,
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or (at your option) any later version.
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The GNU MP Library test suite is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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Public License for more details.
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You should have received a copy of the GNU General Public License along with
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the GNU MP Library test suite. If not, see https://www.gnu.org/licenses/. */
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#include <assert.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "testutils.h"
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#define MAXBITS 400
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#define COUNT 100
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void
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my_mpz_mul (mpz_t r, mpz_srcptr a, mpz_srcptr b)
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{
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mp_limb_t *tp;
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mp_size_t tn, an, bn;
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an = mpz_size (a);
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bn = mpz_size (b);
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assert (an > 0);
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assert (bn > 0);
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tn = an + bn;
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tp = mpz_limbs_write (r, tn);
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if (an > bn)
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mpn_mul (tp, mpz_limbs_read (a), an, mpz_limbs_read (b), bn);
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else
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mpn_mul (tp, mpz_limbs_read (b), bn, mpz_limbs_read (a), an);
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if (mpz_sgn (a) != mpz_sgn(b))
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tn = - tn;
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mpz_limbs_finish (r, tn);
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}
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void
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testmain (int argc, char **argv)
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{
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unsigned i;
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mpz_t a, b, res, ref;
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mpz_init (a);
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mpz_init (b);
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mpz_init (res);
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mpz_init (ref);
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for (i = 0; i < COUNT; i++)
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{
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mini_random_op3 (OP_MUL, MAXBITS, a, b, ref);
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if (mpz_sgn(ref) == 0)
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/* my_mpz_mul requires a != 0, b != 0 */
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continue;
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my_mpz_mul (res, a, b);
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if (mpz_cmp (res, ref))
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{
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fprintf (stderr, "my_mpz_mul failed:\n");
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dump ("a", a);
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dump ("b", b);
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dump ("r", res);
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dump ("ref", ref);
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abort ();
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}
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/* The following test exploits a side-effect of my_mpz_mul: res
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points to a buffer with at least an+bn limbs, and the limbs
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above the result are zeroed. */
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if (mpz_size (b) > 0 && mpz_getlimbn (res, mpz_size(a)) != mpz_limbs_read (res) [mpz_size(a)])
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{
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fprintf (stderr, "getlimbn - limbs_read differ.\n");
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abort ();
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}
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if ((i % 4 == 0) && mpz_size (res) > 1)
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{
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mpz_realloc2 (res, 1);
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if (mpz_cmp_ui (res, 0))
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{
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fprintf (stderr, "mpz_realloc2 did not clear res.\n");
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abort ();
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}
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mpz_limbs_finish (ref, 0);
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if (mpz_cmp_d (ref, 0))
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{
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fprintf (stderr, "mpz_limbs_finish did not clear res.\n");
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abort ();
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}
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}
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}
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mpz_clear (a);
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mpz_clear (b);
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mpz_clear (res);
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mpz_clear (ref);
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}
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