140 lines
2.9 KiB
C
140 lines
2.9 KiB
C
/*
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Copyright 2012, 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 "testutils.h"
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#define GMP_LIMB_BITS (sizeof(mp_limb_t) * CHAR_BIT)
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#define COUNT 10000
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static void
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test_2by1(const mpz_t u)
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{
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mpz_t m, p, t;
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mpz_init (m);
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mpz_init (p);
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mpz_init (t);
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assert (mpz_size (u) == 1);
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mpz_set_ui (m, mpn_invert_limb (u->_mp_d[0]));
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mpz_setbit (m, GMP_LIMB_BITS);
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mpz_mul (p, m, u);
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mpz_set_ui (t, 0);
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mpz_setbit (t, 2* GMP_LIMB_BITS);
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mpz_sub (t, t, p);
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/* Should have 0 < B^2 - m u <= u */
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if (mpz_sgn (t) <= 0 || mpz_cmp (t, u) > 0)
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{
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fprintf (stderr, "mpn_invert_limb failed:\n");
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dump ("u", u);
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dump ("m", m);
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dump ("p", p);
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dump ("t", t);
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abort ();
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}
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mpz_clear (m);
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mpz_clear (p);
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mpz_clear (t);
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}
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static void
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test_3by2(const mpz_t u)
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{
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mpz_t m, p, t;
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mpz_init (m);
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mpz_init (p);
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mpz_init (t);
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assert (mpz_size (u) == 2);
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mpz_set_ui (m, mpn_invert_3by2 (u->_mp_d[1], u[0]._mp_d[0]));
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mpz_setbit (m, GMP_LIMB_BITS);
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mpz_mul (p, m, u);
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mpz_set_ui (t, 0);
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mpz_setbit (t, 3 * GMP_LIMB_BITS);
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mpz_sub (t, t, p);
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/* Should have 0 < B^3 - m u <= u */
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if (mpz_sgn (t) <= 0 || mpz_cmp (t, u) > 0)
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{
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fprintf (stderr, "mpn_invert_3by2 failed:\n");
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dump ("u", u);
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dump ("m", m);
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dump ("p", p);
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dump ("t", t);
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abort ();
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}
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mpz_clear (m);
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mpz_clear (p);
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mpz_clear (t);
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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 u, m, p, t;
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mpz_init (u);
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mpz_init (m);
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mpz_init (p);
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mpz_init (t);
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/* These values trigger 32-bit overflow of ql in mpn_invert_3by2. */
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if (GMP_LIMB_BITS == 64)
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{
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mpz_set_str (u, "80007fff3ffe0000", 16);
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test_2by1 (u);
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mpz_set_str (u, "80007fff3ffe000000000000000003ff", 16);
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test_3by2 (u);
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}
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for (i = 0; i < COUNT; i++)
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{
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mini_urandomb (u, GMP_LIMB_BITS);
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mpz_setbit (u, GMP_LIMB_BITS -1);
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test_2by1 (u);
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}
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for (i = 0; i < COUNT; i++)
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{
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mini_urandomb (u, 2*GMP_LIMB_BITS);
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mpz_setbit (u, 2*GMP_LIMB_BITS -1);
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test_3by2 (u);
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}
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mpz_clear (u);
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}
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