flint-sys 0.9.0

Bindings to the FLINT C library
Documentation 
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/*
    Copyright (C) 2009 William Hart

    This file is part of FLINT.

    FLINT is free software: you can redistribute it and/or modify it under
    the terms of the GNU Lesser General Public License (LGPL) as published
    by the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.  See <https://www.gnu.org/licenses/>.
*/

#include "ulong_extras.h"
#include "test_helpers.h"

TEST_FUNCTION_START(umul_ppmm, state)
{
    int i, j, result;

    for (i = 0; i < 100000 * flint_test_multiplier(); i++)
    {
        ulong ph1, pl1, ph2, pl2, pl2old, m1, m2, bit;

        m1 = n_randtest(state);
        m2 = n_randtest(state);

        umul_ppmm(ph1, pl1, m1, m2);

        pl2old = UWORD(0);
        pl2 = UWORD(0);
        ph2 = UWORD(0);
        bit = UWORD(1);
        for (j = 0; j < FLINT_BITS; j++)
        {
            if (m2 & bit)
            {
                pl2 += (m1 << j);
                ph2 += (pl2 < pl2old);
                ph2 += r_shift(m1, FLINT_BITS - j);
                pl2old = pl2;
            }
            bit <<= 1;
        }

        result = ((ph2 == ph1) && (pl2 == pl1));

        if (!result)
            TEST_FUNCTION_FAIL(
                    "m1 = %wu, m2 = %wu\n"
                    "ph2 = %wu, ph1 = %wu, pl2 = %wu, pl1 = %wu\n",
                    m1, m2, ph2, ph1, pl2, pl1);
    }

    TEST_FUNCTION_END(state);
}