mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-12-14 09:39:42 +00:00
6bd47f4477
This incorporates: 2020-05-03 attribute: new module 2020-04-13 explicit_bzero: improve code style 2020-04-13 explicit_bzero: On native Windows, use SecureZeroMemory 2020-04-13 explicit_bzero: use memset_s() when available 2020-04-04 maint: remove a stray inter-word space * build-aux/config.guess, build-aux/config.sub: * build-aux/gitlog-to-changelog, build-aux/update-copyright: * doc/misc/texinfo.tex, lib/explicit_bzero.c, lib/ieee754.in.h: * lib/nstrftime.c, m4/explicit_bzero.m4, m4/gnulib-common.m4: Copy from Gnulib. * lib/attribute.h: New file, copied from Gnulib. * lib/gnulib.mk.in, m4/gnulib-comp.m4: Regenerate.
223 lines
5.3 KiB
C
223 lines
5.3 KiB
C
/* Copyright (C) 1992-2020 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 General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 3 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
|
|
General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef _IEEE754_H
|
|
|
|
#define _IEEE754_H 1
|
|
|
|
#ifndef _GL_GNULIB_HEADER
|
|
/* Ordinary glibc usage. */
|
|
# include <features.h>
|
|
# include <endian.h>
|
|
#else
|
|
/* Gnulib usage. */
|
|
# ifndef __BEGIN_DECLS
|
|
# ifdef __cplusplus
|
|
# define __BEGIN_DECLS extern "C" {
|
|
# define __END_DECLS }
|
|
# else
|
|
# define __BEGIN_DECLS
|
|
# define __END_DECLS
|
|
# endif
|
|
# endif
|
|
# ifndef __FLOAT_WORD_ORDER
|
|
# define __LITTLE_ENDIAN 1234
|
|
# define __BIG_ENDIAN 4321
|
|
# ifdef WORDS_BIGENDIAN
|
|
# define __BYTE_ORDER __BIG_ENDIAN
|
|
# else
|
|
# define __BYTE_ORDER __LITTLE_ENDIAN
|
|
# endif
|
|
# define __FLOAT_WORD_ORDER __BYTE_ORDER
|
|
# endif
|
|
#endif
|
|
|
|
__BEGIN_DECLS
|
|
|
|
union ieee754_float
|
|
{
|
|
float f;
|
|
|
|
/* This is the IEEE 754 single-precision format. */
|
|
struct
|
|
{
|
|
#if __BYTE_ORDER == __BIG_ENDIAN
|
|
unsigned int negative:1;
|
|
unsigned int exponent:8;
|
|
unsigned int mantissa:23;
|
|
#endif /* Big endian. */
|
|
#if __BYTE_ORDER == __LITTLE_ENDIAN
|
|
unsigned int mantissa:23;
|
|
unsigned int exponent:8;
|
|
unsigned int negative:1;
|
|
#endif /* Little endian. */
|
|
} ieee;
|
|
|
|
/* This format makes it easier to see if a NaN is a signalling NaN. */
|
|
struct
|
|
{
|
|
#if __BYTE_ORDER == __BIG_ENDIAN
|
|
unsigned int negative:1;
|
|
unsigned int exponent:8;
|
|
unsigned int quiet_nan:1;
|
|
unsigned int mantissa:22;
|
|
#endif /* Big endian. */
|
|
#if __BYTE_ORDER == __LITTLE_ENDIAN
|
|
unsigned int mantissa:22;
|
|
unsigned int quiet_nan:1;
|
|
unsigned int exponent:8;
|
|
unsigned int negative:1;
|
|
#endif /* Little endian. */
|
|
} ieee_nan;
|
|
};
|
|
|
|
#define IEEE754_FLOAT_BIAS 0x7f /* Added to exponent. */
|
|
|
|
|
|
union ieee754_double
|
|
{
|
|
double d;
|
|
|
|
/* This is the IEEE 754 double-precision format. */
|
|
struct
|
|
{
|
|
#if __BYTE_ORDER == __BIG_ENDIAN
|
|
unsigned int negative:1;
|
|
unsigned int exponent:11;
|
|
/* Together these comprise the mantissa. */
|
|
unsigned int mantissa0:20;
|
|
unsigned int mantissa1:32;
|
|
#endif /* Big endian. */
|
|
#if __BYTE_ORDER == __LITTLE_ENDIAN
|
|
# if __FLOAT_WORD_ORDER == __BIG_ENDIAN
|
|
unsigned int mantissa0:20;
|
|
unsigned int exponent:11;
|
|
unsigned int negative:1;
|
|
unsigned int mantissa1:32;
|
|
# else
|
|
/* Together these comprise the mantissa. */
|
|
unsigned int mantissa1:32;
|
|
unsigned int mantissa0:20;
|
|
unsigned int exponent:11;
|
|
unsigned int negative:1;
|
|
# endif
|
|
#endif /* Little endian. */
|
|
} ieee;
|
|
|
|
/* This format makes it easier to see if a NaN is a signalling NaN. */
|
|
struct
|
|
{
|
|
#if __BYTE_ORDER == __BIG_ENDIAN
|
|
unsigned int negative:1;
|
|
unsigned int exponent:11;
|
|
unsigned int quiet_nan:1;
|
|
/* Together these comprise the mantissa. */
|
|
unsigned int mantissa0:19;
|
|
unsigned int mantissa1:32;
|
|
#else
|
|
# if __FLOAT_WORD_ORDER == __BIG_ENDIAN
|
|
unsigned int mantissa0:19;
|
|
unsigned int quiet_nan:1;
|
|
unsigned int exponent:11;
|
|
unsigned int negative:1;
|
|
unsigned int mantissa1:32;
|
|
# else
|
|
/* Together these comprise the mantissa. */
|
|
unsigned int mantissa1:32;
|
|
unsigned int mantissa0:19;
|
|
unsigned int quiet_nan:1;
|
|
unsigned int exponent:11;
|
|
unsigned int negative:1;
|
|
# endif
|
|
#endif
|
|
} ieee_nan;
|
|
};
|
|
|
|
#define IEEE754_DOUBLE_BIAS 0x3ff /* Added to exponent. */
|
|
|
|
|
|
union ieee854_long_double
|
|
{
|
|
long double d;
|
|
|
|
/* This is the IEEE 854 double-extended-precision format. */
|
|
struct
|
|
{
|
|
#if __BYTE_ORDER == __BIG_ENDIAN
|
|
unsigned int negative:1;
|
|
unsigned int exponent:15;
|
|
unsigned int empty:16;
|
|
unsigned int mantissa0:32;
|
|
unsigned int mantissa1:32;
|
|
#endif
|
|
#if __BYTE_ORDER == __LITTLE_ENDIAN
|
|
# if __FLOAT_WORD_ORDER == __BIG_ENDIAN
|
|
unsigned int exponent:15;
|
|
unsigned int negative:1;
|
|
unsigned int empty:16;
|
|
unsigned int mantissa0:32;
|
|
unsigned int mantissa1:32;
|
|
# else
|
|
unsigned int mantissa1:32;
|
|
unsigned int mantissa0:32;
|
|
unsigned int exponent:15;
|
|
unsigned int negative:1;
|
|
unsigned int empty:16;
|
|
# endif
|
|
#endif
|
|
} ieee;
|
|
|
|
/* This is for NaNs in the IEEE 854 double-extended-precision format. */
|
|
struct
|
|
{
|
|
#if __BYTE_ORDER == __BIG_ENDIAN
|
|
unsigned int negative:1;
|
|
unsigned int exponent:15;
|
|
unsigned int empty:16;
|
|
unsigned int one:1;
|
|
unsigned int quiet_nan:1;
|
|
unsigned int mantissa0:30;
|
|
unsigned int mantissa1:32;
|
|
#endif
|
|
#if __BYTE_ORDER == __LITTLE_ENDIAN
|
|
# if __FLOAT_WORD_ORDER == __BIG_ENDIAN
|
|
unsigned int exponent:15;
|
|
unsigned int negative:1;
|
|
unsigned int empty:16;
|
|
unsigned int mantissa0:30;
|
|
unsigned int quiet_nan:1;
|
|
unsigned int one:1;
|
|
unsigned int mantissa1:32;
|
|
# else
|
|
unsigned int mantissa1:32;
|
|
unsigned int mantissa0:30;
|
|
unsigned int quiet_nan:1;
|
|
unsigned int one:1;
|
|
unsigned int exponent:15;
|
|
unsigned int negative:1;
|
|
unsigned int empty:16;
|
|
# endif
|
|
#endif
|
|
} ieee_nan;
|
|
};
|
|
|
|
#define IEEE854_LONG_DOUBLE_BIAS 0x3fff
|
|
|
|
__END_DECLS
|
|
|
|
#endif /* ieee754.h */
|