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/*
Copyright (C) 2014 Fredrik Johansson
This file is part of Arb.
Arb 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 2.1 of the License, or
(at your option) any later version. See <http://www.gnu.org/licenses/>.
*/
#include "mag.h"
/* bound (1 + 1/m)^n, m > 0, n >= 0 */
void
mag_binpow_uiui(mag_t b, ulong m, ulong n)
{
mag_t t;
if (m == 0)
{
mag_inf(b);
return;
}
mag_init(t);
/* bound by exp(n/m) <= 1 + (n/m) + (n/m)^2 */
if (m > n)
{
mag_set_ui(t, n); /* x = n/m */
mag_div_ui(t, t, m);
mag_mul(b, t, t); /* x^2 */
mag_add(b, b, t); /* x */
mag_one(t);
mag_add(b, b, t); /* 1 */
}
else
{
mag_one(b);
mag_div_ui(b, b, m);
mag_one(t);
mag_add(t, t, b);
mag_pow_ui(b, t, n);
}
mag_clear(t);
}
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