flint-sys 0.9.0

Bindings to the FLINT C library
Documentation 
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/*
    Copyright (C) 2014 Fredrik Johansson

    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 "test_helpers.h"
#include "acb.h"

TEST_FUNCTION_START(acb_get_mag_lower, state)
{
    slong iter;

    for (iter = 0; iter < 10000 * 0.1 * flint_test_multiplier(); iter++)
    {
        acb_t a;
        arf_t m2, x, y, s;
        mag_t m;

        acb_init(a);
        mag_init(m);
        arf_init(m2);
        arf_init(x);
        arf_init(y);
        arf_init(s);

        acb_randtest_special(a, state, 200, 10);
        acb_get_mag_lower(m, a);
        MAG_CHECK_BITS(m)

        /* check m^2 <= x^2 + y^2 */
        arf_set_mag(m2, m);
        arf_mul(m2, m2, m2, ARF_PREC_EXACT, ARF_RND_DOWN);

        arb_get_abs_lbound_arf(x, acb_realref(a), ARF_PREC_EXACT);
        arb_get_abs_lbound_arf(y, acb_imagref(a), ARF_PREC_EXACT);
        arf_sosq(s, x, y, ARF_PREC_EXACT, ARF_RND_DOWN);

        if (arf_cmp(m2, s) > 0)
        {
            flint_printf("FAIL:\n\n");
            flint_printf("a = "); acb_print(a); flint_printf("\n\n");
            flint_printf("m = "); mag_print(m); flint_printf("\n\n");
            flint_abort();
        }

        acb_clear(a);
        mag_clear(m);
        arf_clear(m2);
        arf_clear(x);
        arf_clear(y);
        arf_clear(s);
    }

    TEST_FUNCTION_END(state);
}