/* Copyright (C) 1995,1996,1997,1998,2002,2003 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C 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 C 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 C Library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #include "gmp.h" #include "gmp-impl.h" #include <ieee754.h> #include <float.h> #include <math.h> /* Convert a multi-precision integer of the needed number of bits (64 for long double) and an integral power of two to a `long double' in IEEE854 extended-precision format. */ long double __mpn_construct_long_double (mp_srcptr frac_ptr, int expt, int sign) { union ieee854_long_double u; u.ieee.negative = sign; u.ieee.exponent = expt + IEEE854_LONG_DOUBLE_BIAS; #if BITS_PER_MP_LIMB == 32 u.ieee.mantissa1 = frac_ptr[0]; u.ieee.mantissa0 = frac_ptr[1]; #elif BITS_PER_MP_LIMB == 64 u.ieee.mantissa1 = frac_ptr[0] & (((mp_limb_t) 1 << 32) - 1); u.ieee.mantissa0 = frac_ptr[0] >> 32; #else #error "mp_limb size " BITS_PER_MP_LIMB "not accounted for" #endif return u.d; }