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IEEE 754 compatibility on multiple platforms
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| /* Imported into HyperDex by Robert Escriva from OpenBSD 5.7 */ | ||
| #ifndef __x86_64__ | ||
| #error this file depends on the amd64 arch | ||
| #endif | ||
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| /* $OpenBSD: ieee.h,v 1.2 2008/09/07 20:36:06 martynas Exp $ */ | ||
| /* $NetBSD: ieee.h,v 1.1 1996/09/30 16:34:25 ws Exp $ */ | ||
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| /* | ||
| * 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 | ||
| */ | ||
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| /* | ||
| * 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. | ||
| */ | ||
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| /* | ||
| * Define the number of bits in each fraction and exponent. | ||
| * | ||
| * k k+1 | ||
| * Note that 1.0 x 2 == 0.1 x 2 and that denorms are represented | ||
| * | ||
| * (-exp_bias+1) | ||
| * as fractions that look like 0.fffff x 2 . This means that | ||
| * | ||
| * -126 | ||
| * the number 0.10000 x 2 , for instance, is the same as the normalized | ||
| * | ||
| * -127 -128 | ||
| * float 1.0 x 2 . Thus, to represent 2 , we need one leading zero | ||
| * | ||
| * -129 | ||
| * in the fraction; to represent 2 , we need two, and so on. This | ||
| * | ||
| * (-exp_bias-fracbits+1) | ||
| * implies that the smallest denormalized number is 2 | ||
| * | ||
| * for whichever format we are talking about: for single precision, for | ||
| * | ||
| * -126 -149 | ||
| * instance, we get .00000000000000000000001 x 2 , or 1.0 x 2 , and | ||
| * | ||
| * -149 == -127 - 23 + 1. | ||
| */ | ||
| #define SNG_EXPBITS 8 | ||
| #define SNG_FRACBITS 23 | ||
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| #define DBL_EXPBITS 11 | ||
| #define DBL_FRACHBITS 20 | ||
| #define DBL_FRACLBITS 32 | ||
| #define DBL_FRACBITS 52 | ||
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| #define EXT_EXPBITS 15 | ||
| #define EXT_FRACHBITS 32 | ||
| #define EXT_FRACLBITS 32 | ||
| #define EXT_FRACBITS 64 | ||
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| #define EXT_TO_ARRAY32(p, a) do { \ | ||
| (a)[0] = (uint32_t)(p)->ext_fracl; \ | ||
| (a)[1] = (uint32_t)(p)->ext_frach; \ | ||
| } while(0) | ||
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| struct ieee_single { | ||
| u_int sng_frac:23; | ||
| u_int sng_exp:8; | ||
| u_int sng_sign:1; | ||
| }; | ||
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| struct ieee_double { | ||
| u_int dbl_fracl; | ||
| u_int dbl_frach:20; | ||
| u_int dbl_exp:11; | ||
| u_int dbl_sign:1; | ||
| }; | ||
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| struct ieee_ext { | ||
| u_int ext_fracl; | ||
| u_int ext_frach; | ||
| u_int ext_exp:15; | ||
| u_int ext_sign:1; | ||
| u_int ext_padl:16; | ||
| u_int ext_padh; | ||
| }; | ||
|
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| /* | ||
| * 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 SNG_EXP_INFNAN 255 | ||
| #define DBL_EXP_INFNAN 2047 | ||
| #define EXT_EXP_INFNAN 32767 | ||
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| #if 0 | ||
| #define SNG_QUIETNAN (1 << 22) | ||
| #define DBL_QUIETNAN (1 << 19) | ||
| #define EXT_QUIETNAN (1 << 15) | ||
| #endif | ||
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| /* | ||
| * Exponent biases. | ||
| */ | ||
| #define SNG_EXP_BIAS 127 | ||
| #define DBL_EXP_BIAS 1023 | ||
| #define EXT_EXP_BIAS 16383 |
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