[dragonfly.git] / sys / cpu / x86_64 / include / ieee.h

/*	$NetBSD: ieee.h,v 1.7 2003/10/26 21:46:46 kleink Exp $ */

/*
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This software was developed by the Computer Systems Engineering group
 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
 * contributed to Berkeley.
 *
 * All advertising materials mentioning features or use of this software
 * must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Lawrence Berkeley Laboratory.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)ieee.h	8.1 (Berkeley) 6/11/93
 */

/*
 * ieee.h defines the machine-dependent layout of the machine's IEEE
 * floating point.  It does *not* define (yet?) any of the rounding
 * mode bits, exceptions, and so forth.
 */

#include <sys/ieee754.h>

#define	EXT_EXPBITS	15
#define	EXT_FRACBITS	64

/*
 * struct ieee_ext is the raw storage layout of the 80-bit
 * extended-precision type as implemented by the FPU.  Per the
 * respective ABI specifications, it is followed by a tail padding of
 *
 *   x86_64: 48 bits,
 *   i386:   16 bits.
 */
struct ieee_ext {
	u_int	ext_fracl;
	u_int	ext_frach:31;
	u_int	ext_int:1;
	u_int	ext_exp:15;
	u_int	ext_sign:1;
};

/*
 * Floats whose exponent is in [1..INFNAN) (of whatever type) are
 * `normal'.  Floats whose exponent is INFNAN are either Inf or NaN.
 * Floats whose exponent is zero are either zero (iff all fraction
 * bits are zero) or subnormal values.
 *
 * A NaN is a `signalling NaN' if its QUIETNAN bit is clear in its
 * high fraction; if the bit is set, it is a `quiet NaN'.
 */
#define	EXT_EXP_INFNAN	32767

#if 0
#define	EXT_QUIETNAN	(1 << 30)
#endif

/*
 * Exponent biases.
 */
#define	EXT_EXP_BIAS	16383

/*
 * Convenience data structures.
 */
union ieee_ext_u {
	long double		extu_ld;
	struct ieee_ext		extu_ext;
};
Commit	Line	Data
fc3f9779	1	/* $NetBSD: ieee.h,v 1.7 2003/10/26 21:46:46 kleink Exp $ */
fc3f9779 SS	2
	3	/*
	4	* Copyright (c) 1992, 1993
	5	* The Regents of the University of California. All rights reserved.
	6	*
	7	* This software was developed by the Computer Systems Engineering group
	8	* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
	9	* contributed to Berkeley.
	10	*
	11	* All advertising materials mentioning features or use of this software
	12	* must display the following acknowledgement:
	13	* This product includes software developed by the University of
	14	* California, Lawrence Berkeley Laboratory.
	15	*
	16	* Redistribution and use in source and binary forms, with or without
	17	* modification, are permitted provided that the following conditions
	18	* are met:
	19	* 1. Redistributions of source code must retain the above copyright
	20	* notice, this list of conditions and the following disclaimer.
	21	* 2. Redistributions in binary form must reproduce the above copyright
	22	* notice, this list of conditions and the following disclaimer in the
	23	* documentation and/or other materials provided with the distribution.
	24	* 3. Neither the name of the University nor the names of its contributors
	25	* may be used to endorse or promote products derived from this software
	26	* without specific prior written permission.
	27	*
	28	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	29	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	30	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	31	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	32	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	33	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	34	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	35	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	36	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	37	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	38	* SUCH DAMAGE.
	39	*
	40	* @(#)ieee.h 8.1 (Berkeley) 6/11/93
	41	*/
	42
	43	/*
	44	* ieee.h defines the machine-dependent layout of the machine's IEEE
	45	* floating point. It does not define (yet?) any of the rounding
	46	* mode bits, exceptions, and so forth.
	47	*/
	48
	49	#include <sys/ieee754.h>
	50
	51	#define EXT_EXPBITS 15
	52	#define EXT_FRACBITS 64
	53
	54	/*
	55	* struct ieee_ext is the raw storage layout of the 80-bit
	56	* extended-precision type as implemented by the FPU. Per the
	57	* respective ABI specifications, it is followed by a tail padding of
	58	*
c1543a89 SS	59	* x86_64: 48 bits,
c1543a89 SS	60	* i386: 16 bits.
fc3f9779 SS	61	*/
	62	struct ieee_ext {
	63	u_int ext_fracl;
	64	u_int ext_frach:31;
	65	u_int ext_int:1;
	66	u_int ext_exp:15;
	67	u_int ext_sign:1;
	68	};
	69
	70	/*
	71	* Floats whose exponent is in [1..INFNAN) (of whatever type) are
	72	* `normal'. Floats whose exponent is INFNAN are either Inf or NaN.
	73	* Floats whose exponent is zero are either zero (iff all fraction
	74	* bits are zero) or subnormal values.
	75	*
	76	* A NaN is a `signalling NaN' if its QUIETNAN bit is clear in its
	77	* high fraction; if the bit is set, it is a `quiet NaN'.
	78	*/
	79	#define EXT_EXP_INFNAN 32767
	80
	81	#if 0
	82	#define EXT_QUIETNAN (1 << 30)
	83	#endif
	84
	85	/*
	86	* Exponent biases.
	87	*/
	88	#define EXT_EXP_BIAS 16383
	89
	90	/*
	91	* Convenience data structures.
	92	*/
	93	union ieee_ext_u {
	94	long double extu_ld;
	95	struct ieee_ext extu_ext;
	96	};