67 lines
2.0 KiB
C
67 lines
2.0 KiB
C
/*=============================================================================
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This file is part of FLINT.
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FLINT 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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FLINT 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 FLINT; 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) 2010 William Hart
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******************************************************************************/
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#include <gmp.h>
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#include "flint.h"
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#include "nmod_poly.h"
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void _nmod_poly_reverse(mp_ptr output, mp_srcptr input, slong len, slong m)
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{
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slong i, min;
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mp_limb_t temp;
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if (input != output)
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{
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min = FLINT_MIN(m, len);
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for (i = 0; i < min; i++)
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output[m - i - 1] = input[i];
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for ( ; i < m; i++)
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output[m - i - 1] = WORD(0);
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} else
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{
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for (i = 0; i < m/2; i++)
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{
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temp = i < len ? input[i] : 0;
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output[i] = m - i - 1 < len ? input[m - i - 1] : 0;
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output[m - i - 1] = temp;
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}
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if (m & 1 && i >= len) output[i] = 0;
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}
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}
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void nmod_poly_reverse(nmod_poly_t output, const nmod_poly_t input, slong m)
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{
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nmod_poly_fit_length(output, m);
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_nmod_poly_reverse(output->coeffs, input->coeffs, input->length, m);
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output->length = m;
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_nmod_poly_normalise(output);
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}
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