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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"
void
mag_pow_ui(mag_t z, const mag_t x, ulong e)
{
if (mag_is_inf(x))
{
mag_inf(z);
}
else if (e <= 2)
{
if (e == 0)
mag_one(z);
else if (e == 1)
mag_set(z, x);
else
mag_mul(z, x, x);
}
else
{
mag_t y;
int i, bits;
mag_init_set(y, x);
bits = FLINT_BIT_COUNT(e);
for (i = bits - 2; i >= 0; i--)
{
mag_mul(y, y, y);
if (e & (UWORD(1) << i))
mag_mul(y, y, x);
}
mag_swap(z, y);
mag_clear(y);
}
}
void
mag_pow_ui_lower(mag_t z, const mag_t x, ulong e)
{
if (e <= 2)
{
if (e == 0)
mag_one(z);
else if (e == 1)
mag_set(z, x);
else
mag_mul_lower(z, x, x);
}
else if (mag_is_inf(x))
{
mag_inf(z);
}
else
{
mag_t y;
int i, bits;
mag_init_set(y, x);
bits = FLINT_BIT_COUNT(e);
for (i = bits - 2; i >= 0; i--)
{
mag_mul_lower(y, y, y);
if (e & (UWORD(1) << i))
mag_mul_lower(y, y, x);
}
mag_swap(z, y);
mag_clear(y);
}
}
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