71 lines
2.0 KiB
C
71 lines
2.0 KiB
C
/*=============================================================================
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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("invmod....");
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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, t, r, binv, ph, pl;
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do
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{
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a = n_randtest(state);
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b = n_randtest(state);
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} while ((a >= b) || (n_gcd(b, a) != UWORD(1)));
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t = n_invmod(a, b);
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binv = n_preinvert_limb(b);
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umul_ppmm(ph, pl, t, a);
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r = n_ll_mod_preinv(ph, pl, b, binv);
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result = (((r == UWORD(0)) && (b == UWORD(1))) || (r == UWORD(1)));
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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, r = %wd\n", a, b, r);
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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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