mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-21 10:20:06 +00:00
76235ed48f
1998-12-28 Ulrich Drepper <drepper@cygnus.com> * stdlib/fpioconst.c: If __NO_LONG_DOUBLE_MATH don't define constants beyond range of double. * stdlib/fpioconst.h (_fpioconst_pow10): Reduce size according to fpioconst.c change. * stdlib/strtold.c: Fall back on double functions if __NO_LONG_DOUBLE_MATH. * stdlib/strtold_l.c: Likewise. * wcsmbs/wcstold.c: Likewise. * wcsmbs/wcstold_l.c: Likewise. * sysdeps/ieee754/ldbl2mpn.c: Don't generate code if __NO_LONG_DOUBLE_MATH. * sysdeps/ieee754/mpn2ldbl.c: Likewise. 1998-12-28 Geoff Keating <geoffk@ozemail.com.au> * sysdeps/powerpc/bits/endian.h: Use #warning, not #error, if the endianness can't be determined, for makedepend.
52 lines
1.7 KiB
C
52 lines
1.7 KiB
C
/* Copyright (C) 1995, 1996, 1997, 1998 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 Library General Public License as
|
|
published by the Free Software Foundation; either version 2 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
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. 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>
|
|
|
|
#ifndef __NO_LONG_DOUBLE_MATH
|
|
|
|
/* 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] & ((1L << 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;
|
|
}
|
|
|
|
#endif /* __NO_LONG_DOUBLE_MATH */
|