source/libs/mpfr/mpfr-3.1.3/src/stack_interface.c

   1 /* mpfr_stack -- initialize a floating-point number with given allocation area
   2
   3 Copyright 2005-2015 Free Software Foundation, Inc.
   4 Contributed by the AriC and Caramel projects, INRIA.
   5
   6 This file is part of the GNU MPFR Library.
   7
   8 The GNU MPFR Library is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU Lesser General Public License as published by
  10 the Free Software Foundation; either version 3 of the License, or (at your
  11 option) any later version.
  12
  13 The GNU MPFR Library is distributed in the hope that it will be useful, but
  14 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  15 or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
  16 License for more details.
  17
  18 You should have received a copy of the GNU Lesser General Public License
  19 along with the GNU MPFR Library; see the file COPYING.LESSER.  If not, see
  20 http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
  21 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
  22
  23 #include "mpfr-impl.h"
  24
  25 #undef mpfr_custom_get_size
  26 size_t
  27 mpfr_custom_get_size (mpfr_prec_t prec)
  28 {
  29   return MPFR_PREC2LIMBS (prec) * MPFR_BYTES_PER_MP_LIMB;
  30 }
  31
  32 #undef mpfr_custom_init
  33 void
  34 mpfr_custom_init (void *mantissa, mpfr_prec_t prec)
  35 {
  36   return ;
  37 }
  38
  39 #undef mpfr_custom_get_significand
  40 void *
  41 mpfr_custom_get_significand (mpfr_srcptr x)
  42 {
  43   return (void*) MPFR_MANT (x);
  44 }
  45
  46 #undef mpfr_custom_get_exp
  47 mpfr_exp_t
  48 mpfr_custom_get_exp (mpfr_srcptr x)
  49 {
  50   return MPFR_EXP (x);
  51 }
  52
  53 #undef mpfr_custom_move
  54 void
  55 mpfr_custom_move (mpfr_ptr x, void *new_position)
  56 {
  57   MPFR_MANT (x) = (mp_limb_t *) new_position;
  58 }
  59
  60 #undef mpfr_custom_init_set
  61 void
  62 mpfr_custom_init_set (mpfr_ptr x, int kind, mpfr_exp_t exp,
  63                      mpfr_prec_t prec, void *mantissa)
  64 {
  65   mpfr_kind_t t;
  66   int s;
  67   mpfr_exp_t e;
  68
  69   if (kind >= 0)
  70     {
  71       t = (mpfr_kind_t) kind;
  72       s = MPFR_SIGN_POS;
  73     }
  74   else
  75     {
  76       t = (mpfr_kind_t) -kind;
  77       s = MPFR_SIGN_NEG;
  78     }
  79   MPFR_ASSERTD (t <= MPFR_REGULAR_KIND);
  80   e = MPFR_LIKELY (t == MPFR_REGULAR_KIND) ? exp :
  81     MPFR_UNLIKELY (t == MPFR_NAN_KIND) ? MPFR_EXP_NAN :
  82     MPFR_UNLIKELY (t == MPFR_INF_KIND) ? MPFR_EXP_INF : MPFR_EXP_ZERO;
  83
  84   MPFR_PREC (x) = prec;
  85   MPFR_SET_SIGN (x, s);
  86   MPFR_EXP (x) = e;
  87   MPFR_MANT (x) = (mp_limb_t*) mantissa;
  88   return;
  89 }
  90
  91 #undef mpfr_custom_get_kind
  92 int
  93 mpfr_custom_get_kind (mpfr_srcptr x)
  94 {
  95   if (MPFR_LIKELY (!MPFR_IS_SINGULAR (x)))
  96     return (int) MPFR_REGULAR_KIND * MPFR_INT_SIGN (x);
  97   if (MPFR_IS_INF (x))
  98     return (int) MPFR_INF_KIND * MPFR_INT_SIGN (x);
  99   if (MPFR_IS_NAN (x))
 100     return (int) MPFR_NAN_KIND;
 101   MPFR_ASSERTD (MPFR_IS_ZERO (x));
 102   return (int) MPFR_ZERO_KIND * MPFR_INT_SIGN (x);
 103 }
 104