glibc/sysdeps/ieee754/mpn2ldbl.c
Ulrich Drepper 76235ed48f Update.
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.
1998-12-28 14:28:07 +00:00

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 */