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- /* Copyright (C) 1992, 1995, 1996, 1999 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>
- __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 */
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