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105 lines
2.6 KiB
C
105 lines
2.6 KiB
C
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/* mpfr_stack -- initialize a floating-point number with given allocation area
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Copyright 2005, 2006, 2007 Free Software Foundation, Inc.
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Contributed by the Arenaire and Cacao projects, INRIA.
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This file is part of the MPFR Library.
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The MPFR Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version.
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The MPFR Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the MPFR Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include "mpfr-impl.h"
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#undef mpfr_custom_get_size
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size_t
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mpfr_custom_get_size (mp_prec_t prec)
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{
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return (prec + BITS_PER_MP_LIMB -1) / BITS_PER_MP_LIMB * BYTES_PER_MP_LIMB;
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}
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#undef mpfr_custom_init
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void
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mpfr_custom_init (void *mantissa, mp_prec_t prec)
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{
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return ;
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}
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#undef mpfr_custom_get_mantissa
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void *
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mpfr_custom_get_mantissa (mpfr_srcptr x)
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{
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return (void*) MPFR_MANT (x);
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}
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#undef mpfr_custom_get_exp
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mp_exp_t
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mpfr_custom_get_exp (mpfr_srcptr x)
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{
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return MPFR_EXP (x);
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}
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#undef mpfr_custom_move
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void
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mpfr_custom_move (mpfr_ptr x, void *new_position)
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{
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MPFR_MANT (x) = (mp_limb_t *) new_position;
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}
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#undef mpfr_custom_init_set
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void
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mpfr_custom_init_set (mpfr_ptr x, int kind, mp_exp_t exp,
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mp_prec_t prec, void *mantissa)
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{
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mpfr_kind_t t;
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int s;
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mp_exp_t e;
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if (kind >= 0)
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{
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t = (mpfr_kind_t) kind;
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s = MPFR_SIGN_POS;
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}
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else
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{
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t = (mpfr_kind_t) -kind;
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s = MPFR_SIGN_NEG;
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}
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MPFR_ASSERTD (t <= MPFR_REGULAR_KIND);
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e = MPFR_LIKELY (t == MPFR_REGULAR_KIND) ? exp :
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MPFR_UNLIKELY (t == MPFR_NAN_KIND) ? MPFR_EXP_NAN :
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MPFR_UNLIKELY (t == MPFR_INF_KIND) ? MPFR_EXP_INF : MPFR_EXP_ZERO;
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MPFR_PREC (x) = prec;
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MPFR_SET_SIGN (x, s);
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MPFR_EXP (x) = e;
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MPFR_MANT (x) = (mp_limb_t*) mantissa;
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return;
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}
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#undef mpfr_custom_get_kind
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int
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mpfr_custom_get_kind (mpfr_srcptr x)
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{
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if (MPFR_LIKELY (!MPFR_IS_SINGULAR (x)))
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return (int) MPFR_REGULAR_KIND * MPFR_INT_SIGN (x);
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if (MPFR_IS_INF (x))
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return (int) MPFR_INF_KIND * MPFR_INT_SIGN (x);
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if (MPFR_IS_NAN (x))
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return (int) MPFR_NAN_KIND;
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MPFR_ASSERTD (MPFR_IS_ZERO (x));
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return (int) MPFR_ZERO_KIND * MPFR_INT_SIGN (x);
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}
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