128 lines
3.7 KiB
C
128 lines
3.7 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) 2011, 2012 Sebastian Pancratz
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******************************************************************************/
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#include "padic.h"
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void padic_add(padic_t rop, const padic_t op1, const padic_t op2,
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const padic_ctx_t ctx)
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{
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if (padic_prec(rop) <= FLINT_MIN(padic_val(op1), padic_val(op2)))
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{
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padic_zero(rop);
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return;
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}
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if (padic_is_zero(op1))
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{
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padic_set(rop, op2, ctx);
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}
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else if (padic_is_zero(op2))
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{
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padic_set(rop, op1, ctx);
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}
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else
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{
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if (padic_val(op1) == padic_val(op2))
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{
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fmpz_add(padic_unit(rop), padic_unit(op1), padic_unit(op2));
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padic_val(rop) = padic_val(op1);
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_padic_canonicalise(rop, ctx);
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if (padic_prec(rop) <= padic_val(rop))
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{
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padic_zero(rop);
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return;
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}
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}
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else if (padic_val(op1) < padic_val(op2))
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{
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fmpz_t f;
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fmpz_init(f);
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fmpz_pow_ui(f, ctx->p, padic_val(op2) - padic_val(op1));
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if (rop != op2)
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{
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fmpz_set(padic_unit(rop), padic_unit(op1));
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fmpz_addmul(padic_unit(rop), f, padic_unit(op2));
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}
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else
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{
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fmpz_mul(padic_unit(rop), f, padic_unit(op2));
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fmpz_add(padic_unit(rop), padic_unit(rop), padic_unit(op1));
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}
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fmpz_clear(f);
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padic_val(rop) = padic_val(op1);
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}
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else /* padic_val(op1) > padic_val(op2) */
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{
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fmpz_t f;
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fmpz_init(f);
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fmpz_pow_ui(f, ctx->p, padic_val(op1) - padic_val(op2));
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if (rop != op1)
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{
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fmpz_set(padic_unit(rop), padic_unit(op2));
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fmpz_addmul(padic_unit(rop), f, padic_unit(op1));
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}
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else
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{
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fmpz_mul(padic_unit(rop), f, padic_unit(op1));
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fmpz_add(padic_unit(rop), padic_unit(rop), padic_unit(op2));
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}
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fmpz_clear(f);
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padic_val(rop) = padic_val(op2);
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}
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/* Reduce */
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{
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int alloc;
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fmpz_t pow;
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alloc = _padic_ctx_pow_ui(pow, padic_prec(rop) - padic_val(rop), ctx);
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if (padic_prec(rop) >= FLINT_MAX(padic_prec(op1), padic_prec(op2)))
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{
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if (fmpz_cmpabs(padic_unit(rop), pow) >= 0)
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fmpz_sub(padic_unit(rop), padic_unit(rop), pow);
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}
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else
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{
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fmpz_mod(padic_unit(rop), padic_unit(rop), pow);
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}
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if (fmpz_is_zero(padic_unit(rop)))
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padic_val(rop) = 0;
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if (alloc)
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fmpz_clear(pow);
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}
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}
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}
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