[thirdparty/glibc.git] / sysdeps / ieee754 / ieee754.h

/* 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 */
Commit	Line	Data
91873684	1	/* Copyright (C) 1992, 1995, 1996, 1999 Free Software Foundation, Inc.
6d52618b	2	This file is part of the GNU C Library.
28f540f4	3
6d52618b	4	The GNU C Library is free software; you can redistribute it and/or
41bdb6e2 AJ	5	modify it under the terms of the GNU Lesser General Public
	6	License as published by the Free Software Foundation; either
	7	version 2.1 of the License, or (at your option) any later version.
28f540f4	8
6d52618b UD	9	The GNU C Library is distributed in the hope that it will be useful,
	10	but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
41bdb6e2	12	Lesser General Public License for more details.
28f540f4	13
41bdb6e2 AJ	14	You should have received a copy of the GNU Lesser General Public
	15	License along with the GNU C Library; if not, write to the Free
	16	Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
	17	02111-1307 USA. */
28f540f4	18
6bc31da0 UD	19	#ifndef _IEEE754_H
	20
	21	#define _IEEE754_H 1
	22	#include <features.h>
	23
28f540f4 RM	24	#include <endian.h>
28f540f4 RM	25
6bc31da0 UD	26	__BEGIN_DECLS
6bc31da0 UD	27
28f540f4 RM	28	union ieee754_float
	29	{
	30	float f;
069aa638	31
28f540f4 RM	32	/* This is the IEEE 754 single-precision format. */
	33	struct
	34	{
	35	#if __BYTE_ORDER == __BIG_ENDIAN
	36	unsigned int negative:1;
	37	unsigned int exponent:8;
	38	unsigned int mantissa:23;
	39	#endif /* Big endian. */
	40	#if __BYTE_ORDER == __LITTLE_ENDIAN
	41	unsigned int mantissa:23;
	42	unsigned int exponent:8;
	43	unsigned int negative:1;
	44	#endif /* Little endian. */
	45	} ieee;
	46
	47	/* This format makes it easier to see if a NaN is a signalling NaN. */
	48	struct
	49	{
	50	#if __BYTE_ORDER == __BIG_ENDIAN
	51	unsigned int negative:1;
	52	unsigned int exponent:8;
	53	unsigned int quiet_nan:1;
	54	unsigned int mantissa:22;
	55	#endif /* Big endian. */
	56	#if __BYTE_ORDER == __LITTLE_ENDIAN
	57	unsigned int mantissa:22;
	58	unsigned int quiet_nan:1;
	59	unsigned int exponent:8;
	60	unsigned int negative:1;
	61	#endif /* Little endian. */
	62	} ieee_nan;
	63	};
	64
	65	#define IEEE754_FLOAT_BIAS 0x7f /* Added to exponent. */
	66
	67
	68	union ieee754_double
	69	{
	70	double d;
069aa638	71
28f540f4 RM	72	/* This is the IEEE 754 double-precision format. */
	73	struct
	74	{
	75	#if __BYTE_ORDER == __BIG_ENDIAN
	76	unsigned int negative:1;
	77	unsigned int exponent:11;
	78	/* Together these comprise the mantissa. */
	79	unsigned int mantissa0:20;
	80	unsigned int mantissa1:32;
	81	#endif /* Big endian. */
	82	#if __BYTE_ORDER == __LITTLE_ENDIAN
91873684 UD	83	# if __FLOAT_WORD_ORDER == BIG_ENDIAN
	84	unsigned int mantissa0:20;
	85	unsigned int exponent:11;
	86	unsigned int negative:1;
	87	unsigned int mantissa1:32;
	88	# else
28f540f4 RM	89	/* Together these comprise the mantissa. */
	90	unsigned int mantissa1:32;
	91	unsigned int mantissa0:20;
	92	unsigned int exponent:11;
	93	unsigned int negative:1;
91873684	94	# endif
28f540f4 RM	95	#endif /* Little endian. */
	96	} ieee;
	97
	98	/* This format makes it easier to see if a NaN is a signalling NaN. */
	99	struct
	100	{
	101	#if __BYTE_ORDER == __BIG_ENDIAN
	102	unsigned int negative:1;
	103	unsigned int exponent:11;
	104	unsigned int quiet_nan:1;
6d52618b	105	/* Together these comprise the mantissa. */
28f540f4 RM	106	unsigned int mantissa0:19;
	107	unsigned int mantissa1:32;
	108	#else
91873684 UD	109	# if __FLOAT_WORD_ORDER == BIG_ENDIAN
	110	unsigned int mantissa0:19;
	111	unsigned int quiet_nan:1;
	112	unsigned int exponent:11;
	113	unsigned int negative:1;
	114	unsigned int mantissa1:32;
	115	# else
6d52618b	116	/* Together these comprise the mantissa. */
28f540f4 RM	117	unsigned int mantissa1:32;
	118	unsigned int mantissa0:19;
	119	unsigned int quiet_nan:1;
	120	unsigned int exponent:11;
	121	unsigned int negative:1;
91873684	122	# endif
28f540f4 RM	123	#endif
	124	} ieee_nan;
	125	};
	126
	127	#define IEEE754_DOUBLE_BIAS 0x3ff /* Added to exponent. */
	128
	129
	130	union ieee854_long_double
	131	{
	132	long double d;
069aa638	133
28f540f4 RM	134	/* This is the IEEE 854 double-extended-precision format. */
	135	struct
	136	{
	137	#if __BYTE_ORDER == __BIG_ENDIAN
	138	unsigned int negative:1;
	139	unsigned int exponent:15;
	140	unsigned int empty:16;
	141	unsigned int mantissa0:32;
	142	unsigned int mantissa1:32;
	143	#endif
	144	#if __BYTE_ORDER == __LITTLE_ENDIAN
91873684 UD	145	# if __FLOAT_WORD_ORDER == BIG_ENDIAN
	146	unsigned int exponent:15;
	147	unsigned int negative:1;
	148	unsigned int empty:16;
	149	unsigned int mantissa0:32;
	150	unsigned int mantissa1:32;
	151	# else
28f540f4 RM	152	unsigned int mantissa1:32;
	153	unsigned int mantissa0:32;
	154	unsigned int exponent:15;
	155	unsigned int negative:1;
	156	unsigned int empty:16;
91873684	157	# endif
28f540f4 RM	158	#endif
28f540f4 RM	159	} ieee;
069aa638	160
28f540f4 RM	161	/* This is for NaNs in the IEEE 854 double-extended-precision format. */
	162	struct
	163	{
	164	#if __BYTE_ORDER == __BIG_ENDIAN
	165	unsigned int negative:1;
	166	unsigned int exponent:15;
	167	unsigned int empty:16;
7176f4e4	168	unsigned int one:1;
28f540f4	169	unsigned int quiet_nan:1;
7176f4e4	170	unsigned int mantissa0:30;
28f540f4 RM	171	unsigned int mantissa1:32;
	172	#endif
	173	#if __BYTE_ORDER == __LITTLE_ENDIAN
91873684 UD	174	# if __FLOAT_WORD_ORDER == BIG_ENDIAN
	175	unsigned int exponent:15;
	176	unsigned int negative:1;
	177	unsigned int empty:16;
	178	unsigned int mantissa0:30;
	179	unsigned int quiet_nan:1;
	180	unsigned int one:1;
	181	unsigned int mantissa1:32;
	182	# else
28f540f4	183	unsigned int mantissa1:32;
7176f4e4	184	unsigned int mantissa0:30;
28f540f4	185	unsigned int quiet_nan:1;
069aa638	186	unsigned int one:1;
28f540f4 RM	187	unsigned int exponent:15;
	188	unsigned int negative:1;
	189	unsigned int empty:16;
91873684	190	# endif
28f540f4 RM	191	#endif
	192	} ieee_nan;
	193	};
	194
	195	#define IEEE854_LONG_DOUBLE_BIAS 0x3fff
6bc31da0 UD	196
	197	__END_DECLS
	198
	199	#endif /* ieee754.h */