mirror of
https://github.com/vale981/arb
synced 2025-03-05 09:21:38 -05:00
101 lines
2.3 KiB
C
101 lines
2.3 KiB
C
/*=============================================================================
|
|
|
|
This file is part of ARB.
|
|
|
|
ARB is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
ARB is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with ARB; if not, write to the Free Software
|
|
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
|
|
=============================================================================*/
|
|
/******************************************************************************
|
|
|
|
Copyright (C) 2014 Fredrik Johansson
|
|
|
|
******************************************************************************/
|
|
|
|
#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 & (1UL << 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 & (1UL << i))
|
|
mag_mul_lower(y, y, x);
|
|
}
|
|
|
|
mag_swap(z, y);
|
|
mag_clear(y);
|
|
}
|
|
}
|
|
|