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This file is part of the GNU C Library.

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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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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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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, see

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<http://www.gnu.org/licenses/>. */

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#ifndef _IEEE754_H

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#define _IEEE754_H 1

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#include <features.h>

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#include <endian.h>

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__BEGIN_DECLS

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union ieee754_float

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{

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float f;

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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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/* 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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#define IEEE754_FLOAT_BIAS 0x7f /* Added to exponent. */

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union ieee754_double

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{

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double d;

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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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/* 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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#define IEEE754_DOUBLE_BIAS 0x3ff /* Added to exponent. */

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union ieee854_long_double

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{

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long double d;

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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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/* 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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#define IEEE854_LONG_DOUBLE_BIAS 0x3fff

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__END_DECLS

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#endif /* ieee754.h */

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