mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-27 04:41:02 +08:00
2af06d0d3e
* sysdeps/mips/ieee754.h: Use protected namespace __BIG_ENDIAN/__LITTLE_ENDIAN. Patch by Aurelien Jarno <aurelien@aurel32.net>.
326 lines
8.0 KiB
C
326 lines
8.0 KiB
C
/* Copyright (C) 1992, 1995, 1996, 1999, 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. */
|
|
|
|
#ifndef _IEEE754_H
|
|
|
|
#define _IEEE754_H 1
|
|
#include <features.h>
|
|
|
|
#include <endian.h>
|
|
|
|
#include <float.h>
|
|
|
|
__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. */
|
|
|
|
#if LDBL_MANT_DIG == 113
|
|
|
|
union ieee854_long_double
|
|
{
|
|
long double d;
|
|
|
|
/* This is the IEEE 854 quad-precision format. */
|
|
struct
|
|
{
|
|
#if __BYTE_ORDER == __BIG_ENDIAN
|
|
unsigned int negative:1;
|
|
unsigned int exponent:15;
|
|
/* Together these comprise the mantissa. */
|
|
unsigned int mantissa0:16;
|
|
unsigned int mantissa1:32;
|
|
unsigned int mantissa2:32;
|
|
unsigned int mantissa3:32;
|
|
#endif /* Big endian. */
|
|
#if __BYTE_ORDER == __LITTLE_ENDIAN
|
|
/* Together these comprise the mantissa. */
|
|
unsigned int mantissa3:32;
|
|
unsigned int mantissa2:32;
|
|
unsigned int mantissa1:32;
|
|
unsigned int mantissa0:16;
|
|
unsigned int exponent:15;
|
|
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:15;
|
|
unsigned int quiet_nan:1;
|
|
/* Together these comprise the mantissa. */
|
|
unsigned int mantissa0:15;
|
|
unsigned int mantissa1:32;
|
|
unsigned int mantissa2:32;
|
|
unsigned int mantissa3:32;
|
|
#endif /* Big endian. */
|
|
#if __BYTE_ORDER == __LITTLE_ENDIAN
|
|
/* Together these comprise the mantissa. */
|
|
unsigned int mantissa3:32;
|
|
unsigned int mantissa2:32;
|
|
unsigned int mantissa1:32;
|
|
unsigned int mantissa0:15;
|
|
unsigned int quiet_nan:1;
|
|
unsigned int exponent:15;
|
|
unsigned int negative:1;
|
|
#endif /* Little endian. */
|
|
} ieee_nan;
|
|
};
|
|
|
|
#define IEEE854_LONG_DOUBLE_BIAS 0x3fff /* Added to exponent. */
|
|
|
|
#elif LDBL_MANT_DIG == 64
|
|
|
|
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
|
|
|
|
#elif LDBL_MANT_DIG == 53
|
|
|
|
union ieee854_long_double
|
|
{
|
|
long 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 IEEE854_LONG_DOUBLE_BIAS 0x3ff /* Added to exponent. */
|
|
|
|
#endif /* LDBL_MANT_DIG == 53 */
|
|
|
|
__END_DECLS
|
|
|
|
#endif /* ieee754.h */
|