77 lines
2.2 KiB
C
77 lines
2.2 KiB
C
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/*=============================================================================
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This file is part of FLINT.
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FLINT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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FLINT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with FLINT; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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=============================================================================*/
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/******************************************************************************
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Copyright (C) 2009 William Hart
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******************************************************************************/
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#include <stdio.h>
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#include <stdlib.h>
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#include <gmp.h>
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#include "flint.h"
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#include "ulong_extras.h"
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int main(void)
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{
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int i, result;
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FLINT_TEST_INIT(state);
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flint_printf("gcdinv....");
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fflush(stdout);
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for (i = 0; i < 10000 * flint_test_multiplier(); i++)
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{
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mp_limb_t a, b, c, g, g2, s, t2, t, bits1, bits2, bits3;
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bits1 = n_randint(state, FLINT_BITS-2) + 2;
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bits2 = n_randint(state, bits1) + 1;
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bits3 = n_randint(state, FLINT_BITS - bits1) + 1;
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do
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{
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a = n_randtest_bits(state, bits1);
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b = n_randtest_bits(state, bits2);
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} while ((n_gcd(a, b) != UWORD(1)) || (b >= a));
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c = n_randtest_bits(state, bits3);
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g = n_xgcd(&s, &t, a*c, b*c);
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g2 = n_gcdinv(&t2, b*c, a*c);
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t %= (a*c);
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t = a*c - t;
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result = ((g == g2) && (t == t2));
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if (!result)
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{
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flint_printf("FAIL\n");
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flint_printf("a = %wu, b = %wu, c = %wu, g = %wu, g2 = %wu, t = %wd, t2 = %wd\n", a, b, c, g, g2, t, t2);
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abort();
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}
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}
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FLINT_TEST_CLEANUP(state);
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flint_printf("PASS\n");
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return 0;
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}
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