| /* mpfr_stack -- initialize a floating-point number with given allocation area |
| |
| Copyright 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc. |
| Contributed by the Arenaire and Cacao projects, INRIA. |
| |
| This file is part of the GNU MPFR Library. |
| |
| The GNU MPFR Library is free software; you can redistribute it and/or modify |
| it under the terms of the GNU Lesser General Public License as published by |
| the Free Software Foundation; either version 2.1 of the License, or (at your |
| option) any later version. |
| |
| The GNU MPFR Library is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public |
| License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public License |
| along with the GNU MPFR Library; see the file COPYING.LIB. If not, write to |
| the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, |
| MA 02110-1301, USA. */ |
| |
| #include "mpfr-impl.h" |
| |
| #undef mpfr_custom_get_size |
| size_t |
| mpfr_custom_get_size (mp_prec_t prec) |
| { |
| return (prec + BITS_PER_MP_LIMB -1) / BITS_PER_MP_LIMB * BYTES_PER_MP_LIMB; |
| } |
| |
| #undef mpfr_custom_init |
| void |
| mpfr_custom_init (void *mantissa, mp_prec_t prec) |
| { |
| return ; |
| } |
| |
| #undef mpfr_custom_get_mantissa |
| void * |
| mpfr_custom_get_mantissa (mpfr_srcptr x) |
| { |
| return (void*) MPFR_MANT (x); |
| } |
| |
| #undef mpfr_custom_get_exp |
| mp_exp_t |
| mpfr_custom_get_exp (mpfr_srcptr x) |
| { |
| return MPFR_EXP (x); |
| } |
| |
| #undef mpfr_custom_move |
| void |
| mpfr_custom_move (mpfr_ptr x, void *new_position) |
| { |
| MPFR_MANT (x) = (mp_limb_t *) new_position; |
| } |
| |
| #undef mpfr_custom_init_set |
| void |
| mpfr_custom_init_set (mpfr_ptr x, int kind, mp_exp_t exp, |
| mp_prec_t prec, void *mantissa) |
| { |
| mpfr_kind_t t; |
| int s; |
| mp_exp_t e; |
| |
| if (kind >= 0) |
| { |
| t = (mpfr_kind_t) kind; |
| s = MPFR_SIGN_POS; |
| } |
| else |
| { |
| t = (mpfr_kind_t) -kind; |
| s = MPFR_SIGN_NEG; |
| } |
| MPFR_ASSERTD (t <= MPFR_REGULAR_KIND); |
| e = MPFR_LIKELY (t == MPFR_REGULAR_KIND) ? exp : |
| MPFR_UNLIKELY (t == MPFR_NAN_KIND) ? MPFR_EXP_NAN : |
| MPFR_UNLIKELY (t == MPFR_INF_KIND) ? MPFR_EXP_INF : MPFR_EXP_ZERO; |
| |
| MPFR_PREC (x) = prec; |
| MPFR_SET_SIGN (x, s); |
| MPFR_EXP (x) = e; |
| MPFR_MANT (x) = (mp_limb_t*) mantissa; |
| return; |
| } |
| |
| #undef mpfr_custom_get_kind |
| int |
| mpfr_custom_get_kind (mpfr_srcptr x) |
| { |
| if (MPFR_LIKELY (!MPFR_IS_SINGULAR (x))) |
| return (int) MPFR_REGULAR_KIND * MPFR_INT_SIGN (x); |
| if (MPFR_IS_INF (x)) |
| return (int) MPFR_INF_KIND * MPFR_INT_SIGN (x); |
| if (MPFR_IS_NAN (x)) |
| return (int) MPFR_NAN_KIND; |
| MPFR_ASSERTD (MPFR_IS_ZERO (x)); |
| return (int) MPFR_ZERO_KIND * MPFR_INT_SIGN (x); |
| } |
| |