mirror of
https://github.com/vale981/arb
synced 2025-03-05 09:21:38 -05:00
67 lines
1.7 KiB
C
67 lines
1.7 KiB
C
/*
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Copyright (C) 2014 Fredrik Johansson
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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 it under
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the terms of the GNU Lesser General Public License (LGPL) as published
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by the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version. See <http://www.gnu.org/licenses/>.
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*/
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#include "arf.h"
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int
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arf_set_round(arf_t y, const arf_t x, slong prec, arf_rnd_t rnd)
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{
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if (arf_is_special(x))
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{
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arf_set(y, x);
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return 0;
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}
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else
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{
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int inexact;
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slong fix;
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mp_size_t xn;
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mp_srcptr xptr;
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if (y == x)
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{
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mp_ptr xtmp;
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TMP_INIT;
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ARF_GET_MPN_READONLY(xptr, xn, x);
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/* exact */
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if (xn * FLINT_BITS <= prec)
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return 0;
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if ((xn - 1) * FLINT_BITS < prec)
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{
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/* exact */
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if ((xptr[0] << (prec - (xn-1) * FLINT_BITS)) == 0)
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return 0;
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}
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/* inexact */
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TMP_START;
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xtmp = TMP_ALLOC(xn * sizeof(mp_limb_t));
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flint_mpn_copyi(xtmp, xptr, xn);
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inexact = _arf_set_round_mpn(y, &fix, xtmp, xn, ARF_SGNBIT(x), prec, rnd);
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_fmpz_add_fast(ARF_EXPREF(y), ARF_EXPREF(x), fix);
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TMP_END;
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return inexact;
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}
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else
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{
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ARF_GET_MPN_READONLY(xptr, xn, x);
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inexact = _arf_set_round_mpn(y, &fix, xptr, xn,
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ARF_SGNBIT(x), prec, rnd);
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_fmpz_add_fast(ARF_EXPREF(y), ARF_EXPREF(x), fix);
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return inexact;
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}
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}
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}
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