1  /* custom interface -- initialize a floating-point number with given
       2     allocation area
       3  
       4  Copyright 2005-2023 Free Software Foundation, Inc.
       5  Contributed by the AriC and Caramba projects, INRIA.
       6  
       7  This file is part of the GNU MPFR Library.
       8  
       9  The GNU MPFR Library is free software; you can redistribute it and/or modify
      10  it under the terms of the GNU Lesser General Public License as published by
      11  the Free Software Foundation; either version 3 of the License, or (at your
      12  option) any later version.
      13  
      14  The GNU MPFR Library is distributed in the hope that it will be useful, but
      15  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
      16  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
      17  License for more details.
      18  
      19  You should have received a copy of the GNU Lesser General Public License
      20  along with the GNU MPFR Library; see the file COPYING.LESSER.  If not, see
      21  https://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
      22  51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
      23  
      24  #include "mpfr-impl.h"
      25  
      26  #undef mpfr_custom_get_size
      27  size_t
      28  mpfr_custom_get_size (mpfr_prec_t prec)
      29  {
      30    return MPFR_PREC2LIMBS (prec) * MPFR_BYTES_PER_MP_LIMB;
      31  }
      32  
      33  #undef mpfr_custom_init
      34  void
      35  mpfr_custom_init (void *mantissa, mpfr_prec_t prec)
      36  {
      37    return ;
      38  }
      39  
      40  #undef mpfr_custom_get_significand
      41  void *
      42  mpfr_custom_get_significand (mpfr_srcptr x)
      43  {
      44    return (void*) MPFR_MANT (x);
      45  }
      46  
      47  #undef mpfr_custom_get_exp
      48  mpfr_exp_t
      49  mpfr_custom_get_exp (mpfr_srcptr x)
      50  {
      51    return MPFR_EXP (x);
      52  }
      53  
      54  #undef mpfr_custom_move
      55  void
      56  mpfr_custom_move (mpfr_ptr x, void *new_position)
      57  {
      58    MPFR_MANT (x) = (mp_limb_t *) new_position;
      59  }
      60  
      61  #undef mpfr_custom_init_set
      62  void
      63  mpfr_custom_init_set (mpfr_ptr x, int kind, mpfr_exp_t exp,
      64                       mpfr_prec_t prec, void *mantissa)
      65  {
      66    mpfr_kind_t t;
      67    int s;
      68    mpfr_exp_t e;
      69  
      70    if (kind >= 0)
      71      {
      72        t = (mpfr_kind_t) kind;
      73        s = MPFR_SIGN_POS;
      74      }
      75    else
      76      {
      77        t = (mpfr_kind_t) -kind;
      78        s = MPFR_SIGN_NEG;
      79      }
      80    MPFR_ASSERTD (t <= MPFR_REGULAR_KIND);
      81    e = MPFR_LIKELY (t == MPFR_REGULAR_KIND) ? exp :
      82      MPFR_UNLIKELY (t == MPFR_NAN_KIND) ? MPFR_EXP_NAN :
      83      MPFR_UNLIKELY (t == MPFR_INF_KIND) ? MPFR_EXP_INF : MPFR_EXP_ZERO;
      84  
      85    MPFR_PREC (x) = prec;
      86    MPFR_SET_SIGN (x, s);
      87    MPFR_EXP (x) = e;
      88    MPFR_MANT (x) = (mp_limb_t*) mantissa;
      89    return;
      90  }
      91  
      92  #undef mpfr_custom_get_kind
      93  int
      94  mpfr_custom_get_kind (mpfr_srcptr x)
      95  {
      96    if (MPFR_LIKELY (!MPFR_IS_SINGULAR (x)))
      97      return (int) MPFR_REGULAR_KIND * MPFR_INT_SIGN (x);
      98    if (MPFR_IS_INF (x))
      99      return (int) MPFR_INF_KIND * MPFR_INT_SIGN (x);
     100    if (MPFR_IS_NAN (x))
     101      return (int) MPFR_NAN_KIND;
     102    MPFR_ASSERTD (MPFR_IS_ZERO (x));
     103    return (int) MPFR_ZERO_KIND * MPFR_INT_SIGN (x);
     104  }
     105