mirror of
git://git.sv.gnu.org/emacs.git
synced 2025-12-05 22:20:24 -08:00
Substitute a <ieee754.h> on hosts lacking it
* .gitignore: Add lib/ieee754.h. * admin/merge-gnulib (GNULIB_MODULES): Add ieee754-h. * configure.ac: Remove ieee754.h check, as Gnulib now does that. * etc/NEWS: Mention this. * lib/gnulib.mk.in, m4/gnulib-comp.m4: Regenerate. * lib/ieee754.in.h, m4/ieee754-h.m4: New files, from Gnulib. * src/lisp.h (IEEE_FLOATING_POINT): Now a macro so that it can be used in #if. * src/lread.c, src/print.c: Include <ieee754.h> if IEEE_FLOATING_POINT, not if HAVE_IEEE754_H. * src/lread.c (string_to_number): * src/print.c (float_to_string): Process NaNs only on IEEE hosts, and assume <ieee754.h> in that case.
This commit is contained in:
Paul Eggert
parent
2f37ecaefc
commit
d216d7d248
11 changed files with 291 additions and 40 deletions
222
lib/ieee754.in.h
Normal file
222
lib/ieee754.in.h
Normal file
|
|
@ -0,0 +1,222 @@
|
|||
/* Copyright (C) 1992-2018 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
|
||||
<http://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 */
|
||||
Loading…
Add table
Add a link
Reference in a new issue