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https://github.com/vale981/arb
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101 lines
2.3 KiB
C
101 lines
2.3 KiB
C
/*=============================================================================
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This file is part of ARB.
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ARB is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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ARB is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with ARB; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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=============================================================================*/
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/******************************************************************************
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Copyright (C) 2014 Fredrik Johansson
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******************************************************************************/
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#include "mag.h"
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void
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mag_pow_ui(mag_t z, const mag_t x, ulong e)
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{
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if (mag_is_inf(x))
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{
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mag_inf(z);
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}
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else if (e <= 2)
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{
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if (e == 0)
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mag_one(z);
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else if (e == 1)
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mag_set(z, x);
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else
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mag_mul(z, x, x);
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}
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else
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{
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mag_t y;
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int i, bits;
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mag_init_set(y, x);
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bits = FLINT_BIT_COUNT(e);
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for (i = bits - 2; i >= 0; i--)
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{
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mag_mul(y, y, y);
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if (e & (UWORD(1) << i))
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mag_mul(y, y, x);
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}
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mag_swap(z, y);
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mag_clear(y);
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}
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}
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void
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mag_pow_ui_lower(mag_t z, const mag_t x, ulong e)
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{
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if (e <= 2)
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{
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if (e == 0)
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mag_one(z);
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else if (e == 1)
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mag_set(z, x);
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else
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mag_mul_lower(z, x, x);
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}
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else if (mag_is_inf(x))
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{
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mag_inf(z);
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}
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else
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{
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mag_t y;
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int i, bits;
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mag_init_set(y, x);
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bits = FLINT_BIT_COUNT(e);
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for (i = bits - 2; i >= 0; i--)
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{
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mag_mul_lower(y, y, y);
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if (e & (UWORD(1) << i))
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mag_mul_lower(y, y, x);
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}
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mag_swap(z, y);
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mag_clear(y);
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}
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}
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