[mirror_edk2.git] / StdLib / Include / x86 / ieee.h

/*	$NetBSD: ieee.h,v 1.9.32.1 2007/05/07 19:49:10 pavel Exp $ */\r
\r
/*\r
 * Copyright (c) 1992, 1993\r
 *	The Regents of the University of California.  All rights reserved.\r
 *\r
 * This software was developed by the Computer Systems Engineering group\r
 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and\r
 * contributed to Berkeley.\r
 *\r
 * All advertising materials mentioning features or use of this software\r
 * must display the following acknowledgement:\r
 *	This product includes software developed by the University of\r
 *	California, Lawrence Berkeley Laboratory.\r
 *\r
 * Redistribution and use in source and binary forms, with or without\r
 * modification, are permitted provided that the following conditions\r
 * are met:\r
 * 1. Redistributions of source code must retain the above copyright\r
 *    notice, this list of conditions and the following disclaimer.\r
 * 2. Redistributions in binary form must reproduce the above copyright\r
 *    notice, this list of conditions and the following disclaimer in the\r
 *    documentation and/or other materials provided with the distribution.\r
 * 3. Neither the name of the University nor the names of its contributors\r
 *    may be used to endorse or promote products derived from this software\r
 *    without specific prior written permission.\r
 *\r
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND\r
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE\r
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE\r
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE\r
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL\r
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS\r
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)\r
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT\r
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY\r
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF\r
 * SUCH DAMAGE.\r
 *\r
 *	@(#)ieee.h	8.1 (Berkeley) 6/11/93\r
 */\r
\r
/*\r
 * ieee.h defines the machine-dependent layout of the machine's IEEE\r
 * floating point.  It does *not* define (yet?) any of the rounding\r
 * mode bits, exceptions, and so forth.\r
 */\r
\r
#include <sys/ieee754.h>\r
\r
#define	EXT_EXPBITS	15\r
#define EXT_FRACHBITS	32\r
#define	EXT_FRACLBITS	32\r
#define	EXT_FRACBITS	(EXT_FRACLBITS + EXT_FRACHBITS)\r
\r
#define	EXT_TO_ARRAY32(u, a) do {			\\r
	(a)[0] = (uint32_t)(u).extu_ext.ext_fracl;	\\r
	(a)[1] = (uint32_t)(u).extu_ext.ext_frach;	\\r
} while(/*CONSTCOND*/0)\r
\r
/*\r
 * struct ieee_ext is the raw storage layout of the 80-bit\r
 * extended-precision type as implemented by the FPU.  Per the\r
 * respective ABI specifications, it is followed by a tail padding of\r
 *\r
 *   amd64: 48 bits,\r
 *   i386:  16 bits.\r
 */\r
struct ieee_ext {\r
	u_int	ext_fracl:EXT_FRACLBITS;\r
	u_int	ext_frach:EXT_FRACHBITS;\r
#if 0\r
	u_int	ext_int:1;\r
#endif\r
	u_int	ext_exp:EXT_EXPBITS;\r
	u_int	ext_sign:1;\r
};\r
\r
/*\r
 * Floats whose exponent is in [1..INFNAN) (of whatever type) are\r
 * `normal'.  Floats whose exponent is INFNAN are either Inf or NaN.\r
 * Floats whose exponent is zero are either zero (iff all fraction\r
 * bits are zero) or subnormal values.\r
 *\r
 * A NaN is a `signalling NaN' if its QUIETNAN bit is clear in its\r
 * high fraction; if the bit is set, it is a `quiet NaN'.\r
 */\r
#define	EXT_EXP_INFNAN	32767\r
\r
#if 0\r
#define	SNG_QUIETNAN	(1 << 22)\r
#define	DBL_QUIETNAN	(1 << 19)\r
#define	EXT_QUIETNAN	(1 << 30)\r
#endif\r
\r
/*\r
 * Exponent biases.\r
 */\r
#define	EXT_EXP_BIAS	16383\r
\r
/*\r
 * Convenience data structures.\r
 */\r
union ieee_ext_u {\r
	long double		extu_ld;\r
	struct ieee_ext		extu_ext;\r
};\r
Commit	Line	Data
2aa62f2b	1	/* $NetBSD: ieee.h,v 1.9.32.1 2007/05/07 19:49:10 pavel Exp $ */\r
	2	\r
	3	/*\r
	4	* Copyright (c) 1992, 1993\r
	5	* The Regents of the University of California. All rights reserved.\r
	6	*\r
	7	* This software was developed by the Computer Systems Engineering group\r
	8	* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and\r
	9	* contributed to Berkeley.\r
	10	*\r
	11	* All advertising materials mentioning features or use of this software\r
	12	* must display the following acknowledgement:\r
	13	* This product includes software developed by the University of\r
	14	* California, Lawrence Berkeley Laboratory.\r
	15	*\r
	16	* Redistribution and use in source and binary forms, with or without\r
	17	* modification, are permitted provided that the following conditions\r
	18	* are met:\r
	19	* 1. Redistributions of source code must retain the above copyright\r
	20	* notice, this list of conditions and the following disclaimer.\r
	21	* 2. Redistributions in binary form must reproduce the above copyright\r
	22	* notice, this list of conditions and the following disclaimer in the\r
	23	* documentation and/or other materials provided with the distribution.\r
	24	* 3. Neither the name of the University nor the names of its contributors\r
	25	* may be used to endorse or promote products derived from this software\r
	26	* without specific prior written permission.\r
	27	*\r
	28	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND\r
	29	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE\r
	30	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE\r
	31	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE\r
	32	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL\r
	33	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS\r
	34	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)\r
	35	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT\r
	36	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY\r
	37	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF\r
	38	* SUCH DAMAGE.\r
	39	*\r
	40	* @(#)ieee.h 8.1 (Berkeley) 6/11/93\r
	41	*/\r
	42	\r
	43	/*\r
	44	* ieee.h defines the machine-dependent layout of the machine's IEEE\r
	45	* floating point. It does not define (yet?) any of the rounding\r
	46	* mode bits, exceptions, and so forth.\r
	47	*/\r
	48	\r
	49	#include <sys/ieee754.h>\r
	50	\r
	51	#define EXT_EXPBITS 15\r
	52	#define EXT_FRACHBITS 32\r
	53	#define EXT_FRACLBITS 32\r
	54	#define EXT_FRACBITS (EXT_FRACLBITS + EXT_FRACHBITS)\r
	55	\r
	56	#define EXT_TO_ARRAY32(u, a) do { \\r
	57	(a)[0] = (uint32_t)(u).extu_ext.ext_fracl; \\r
	58	(a)[1] = (uint32_t)(u).extu_ext.ext_frach; \\r
	59	} while(/CONSTCOND/0)\r
	60	\r
	61	/*\r
	62	* struct ieee_ext is the raw storage layout of the 80-bit\r
	63	* extended-precision type as implemented by the FPU. Per the\r
	64	* respective ABI specifications, it is followed by a tail padding of\r
65	*\r
66	* amd64: 48 bits,\r
67	* i386: 16 bits.\r
68	*/\r
69	struct ieee_ext {\r
70	u_int ext_fracl:EXT_FRACLBITS;\r
71	u_int ext_frach:EXT_FRACHBITS;\r
72	#if 0\r
73	u_int ext_int:1;\r
74	#endif\r
75	u_int ext_exp:EXT_EXPBITS;\r
76	u_int ext_sign:1;\r
77	};\r
78	\r
79	/*\r
80	* Floats whose exponent is in [1..INFNAN) (of whatever type) are\r
81	* `normal'. Floats whose exponent is INFNAN are either Inf or NaN.\r
82	* Floats whose exponent is zero are either zero (iff all fraction\r
83	* bits are zero) or subnormal values.\r
84	*\r
85	* A NaN is a `signalling NaN' if its QUIETNAN bit is clear in its\r
86	* high fraction; if the bit is set, it is a `quiet NaN'.\r
87	*/\r
88	#define EXT_EXP_INFNAN 32767\r
89	\r
90	#if 0\r
91	#define SNG_QUIETNAN (1 << 22)\r
92	#define DBL_QUIETNAN (1 << 19)\r
93	#define EXT_QUIETNAN (1 << 30)\r
94	#endif\r
95	\r
96	/*\r
97	* Exponent biases.\r
98	*/\r
99	#define EXT_EXP_BIAS 16383\r
100	\r
101	/*\r
102	* Convenience data structures.\r
103	*/\r
104	union ieee_ext_u {\r
105	long double extu_ld;\r
106	struct ieee_ext extu_ext;\r
107	};\r