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+/* Copyright (C) 1992, 1995, 1996, 1999 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, write to the Free
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+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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+ 02111-1307 USA. */
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+
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+#ifndef _IEEE754_H
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+
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+#define _IEEE754_H 1
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+#include <features.h>
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+
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+#include <endian.h>
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+
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+__BEGIN_DECLS
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+
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+union ieee754_float
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+ {
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+ float f;
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+
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+ /* This is the IEEE 754 single-precision format. */
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+ struct
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+ {
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+#if __BYTE_ORDER == __BIG_ENDIAN
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+ unsigned int negative:1;
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+ unsigned int exponent:8;
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+ unsigned int mantissa:23;
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+#endif /* Big endian. */
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+#if __BYTE_ORDER == __LITTLE_ENDIAN
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+ unsigned int mantissa:23;
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+ unsigned int exponent:8;
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+ unsigned int negative:1;
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+#endif /* Little endian. */
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+ } ieee;
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+
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+ /* This format makes it easier to see if a NaN is a signalling NaN. */
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+ struct
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+ {
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+#if __BYTE_ORDER == __BIG_ENDIAN
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+ unsigned int negative:1;
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+ unsigned int exponent:8;
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+ unsigned int quiet_nan:1;
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+ unsigned int mantissa:22;
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+#endif /* Big endian. */
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+#if __BYTE_ORDER == __LITTLE_ENDIAN
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+ unsigned int mantissa:22;
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+ unsigned int quiet_nan:1;
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+ unsigned int exponent:8;
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+ unsigned int negative:1;
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+#endif /* Little endian. */
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+ } ieee_nan;
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+ };
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+
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+#define IEEE754_FLOAT_BIAS 0x7f /* Added to exponent. */
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+
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+
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+union ieee754_double
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+ {
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+ double d;
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+
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+ /* This is the IEEE 754 double-precision format. */
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+ struct
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+ {
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+#if __BYTE_ORDER == __BIG_ENDIAN
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+ unsigned int negative:1;
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+ unsigned int exponent:11;
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+ /* Together these comprise the mantissa. */
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+ unsigned int mantissa0:20;
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+ unsigned int mantissa1:32;
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+#endif /* Big endian. */
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+#if __BYTE_ORDER == __LITTLE_ENDIAN
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+# if __FLOAT_WORD_ORDER == BIG_ENDIAN
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+ unsigned int mantissa0:20;
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+ unsigned int exponent:11;
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+ unsigned int negative:1;
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+ unsigned int mantissa1:32;
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+# else
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+ /* Together these comprise the mantissa. */
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+ unsigned int mantissa1:32;
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+ unsigned int mantissa0:20;
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+ unsigned int exponent:11;
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+ unsigned int negative:1;
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+# endif
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+#endif /* Little endian. */
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+ } ieee;
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+
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+ /* This format makes it easier to see if a NaN is a signalling NaN. */
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+ struct
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+ {
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+#if __BYTE_ORDER == __BIG_ENDIAN
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+ unsigned int negative:1;
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+ unsigned int exponent:11;
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+ unsigned int quiet_nan:1;
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+ /* Together these comprise the mantissa. */
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+ unsigned int mantissa0:19;
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+ unsigned int mantissa1:32;
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+#else
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+# if __FLOAT_WORD_ORDER == BIG_ENDIAN
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+ unsigned int mantissa0:19;
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+ unsigned int quiet_nan:1;
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+ unsigned int exponent:11;
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+ unsigned int negative:1;
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+ unsigned int mantissa1:32;
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+# else
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+ /* Together these comprise the mantissa. */
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+ unsigned int mantissa1:32;
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+ unsigned int mantissa0:19;
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+ unsigned int quiet_nan:1;
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+ unsigned int exponent:11;
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+ unsigned int negative:1;
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+# endif
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+#endif
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+ } ieee_nan;
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+ };
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+
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+#define IEEE754_DOUBLE_BIAS 0x3ff /* Added to exponent. */
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+
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+
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+union ieee854_long_double
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+ {
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+ long double d;
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+
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+ /* This is the IEEE 854 double-extended-precision format. */
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+ struct
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+ {
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+#if __BYTE_ORDER == __BIG_ENDIAN
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+ unsigned int negative:1;
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+ unsigned int exponent:15;
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+ unsigned int empty:16;
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+ unsigned int mantissa0:32;
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+ unsigned int mantissa1:32;
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+#endif
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+#if __BYTE_ORDER == __LITTLE_ENDIAN
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+# if __FLOAT_WORD_ORDER == BIG_ENDIAN
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+ unsigned int exponent:15;
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+ unsigned int negative:1;
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+ unsigned int empty:16;
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+ unsigned int mantissa0:32;
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+ unsigned int mantissa1:32;
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+# else
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+ unsigned int mantissa1:32;
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+ unsigned int mantissa0:32;
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+ unsigned int exponent:15;
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+ unsigned int negative:1;
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+ unsigned int empty:16;
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+# endif
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+#endif
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+ } ieee;
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+
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+ /* This is for NaNs in the IEEE 854 double-extended-precision format. */
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+ struct
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+ {
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+#if __BYTE_ORDER == __BIG_ENDIAN
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+ unsigned int negative:1;
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+ unsigned int exponent:15;
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+ unsigned int empty:16;
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+ unsigned int one:1;
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+ unsigned int quiet_nan:1;
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+ unsigned int mantissa0:30;
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+ unsigned int mantissa1:32;
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+#endif
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+#if __BYTE_ORDER == __LITTLE_ENDIAN
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+# if __FLOAT_WORD_ORDER == BIG_ENDIAN
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+ unsigned int exponent:15;
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+ unsigned int negative:1;
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+ unsigned int empty:16;
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+ unsigned int mantissa0:30;
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+ unsigned int quiet_nan:1;
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+ unsigned int one:1;
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+ unsigned int mantissa1:32;
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+# else
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+ unsigned int mantissa1:32;
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+ unsigned int mantissa0:30;
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+ unsigned int quiet_nan:1;
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+ unsigned int one:1;
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+ unsigned int exponent:15;
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+ unsigned int negative:1;
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+ unsigned int empty:16;
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+# endif
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+#endif
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+ } ieee_nan;
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+ };
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+
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+#define IEEE854_LONG_DOUBLE_BIAS 0x3fff
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+
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+__END_DECLS
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+
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+#endif /* ieee754.h */
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