52 lines
1.6 KiB
C
52 lines
1.6 KiB
C
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/*=============================================================================
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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) 2013 Mike Hansen
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******************************************************************************/
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#include "fq_zech.h"
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void
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fq_zech_pth_root(fq_zech_t rop, const fq_zech_t op1, const fq_zech_ctx_t ctx)
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{
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slong i, d;
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mp_limb_t e;
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double qm1inv;
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if (fq_zech_is_zero(op1, ctx) || fq_zech_is_one(op1, ctx))
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{
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rop->value = op1->value;
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return;
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}
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d = fq_zech_ctx_degree(ctx) - 1;
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qm1inv = n_precompute_inverse(ctx->qm1);
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e = op1->value;
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for (i = 0; i < d; i++)
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{
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e = n_mulmod_precomp(ctx->p, e, ctx->qm1, qm1inv);
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}
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rop->value = e;
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}
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