1 /* $NetBSD: ieee.h,v 1.17 2024/01/22 14:37:25 kre Exp $ */ 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 #ifndef __68K_IEEE_H_INCLUDED 44 #define __68K_IEEE_H_INCLUDED 45 46 /* 47 * ieee.h defines the machine-dependent layout of the machine's IEEE 48 * floating point. It does *not* define (yet?) any of the rounding 49 * mode bits, exceptions, and so forth. 50 */ 51 52 #include <sys/ieee754.h> 53 54 #if !defined(__mc68010__) || defined(_KERNEL) 55 #define EXT_EXPBITS 15 56 #define EXT_FRACHBITS 32 57 #define EXT_FRACLBITS 32 58 #define EXT_FRACBITS (EXT_FRACLBITS + EXT_FRACHBITS) 59 60 #define EXT_TO_ARRAY32(u, a) do { \ 61 (a)[0] = (uint32_t)(u).extu_ext.ext_fracl; \ 62 (a)[1] = (uint32_t)(u).extu_ext.ext_frach; \ 63 } while(/*CONSTCOND*/0) 64 65 struct ieee_ext { 66 u_int ext_sign:1; 67 u_int ext_exp:EXT_EXPBITS; 68 u_int ext_zero:16; 69 #if 0 70 u_int ext_int:1; 71 #endif 72 u_int ext_frach; 73 u_int ext_fracl; 74 }; 75 76 /* 77 * Extended floats whose exponent is in [0..INFNAN) and have their 78 * explicit integer bit (the most significant bit of the fraction) 79 * set are `normal'. Floats whose exponent is INFNAN are either Inf or NaN. 80 * Floats whose exponent is zero are either zero (iff all fraction 81 * bits are zero) or subnormal values. 82 * 83 * A NaN is a `signalling NaN' if its QUIETNAN bit is clear in its 84 * high fraction; if the bit is set, it is a `quiet NaN'. 85 */ 86 #define EXT_EXP_INFNAN 0x7fff 87 #define EXT_EXP_INF 0x7fff 88 #define EXT_EXP_NAN 0x7fff 89 90 #if 0 91 #define SNG_QUIETNAN (1 << 22) 92 #define DBL_QUIETNAN (1 << 19) 93 #define EXT_QUIETNAN (1 << 30) 94 #endif 95 96 /* 97 * Exponent biases. 98 */ 99 #define EXT_EXP_BIAS 16383 100 101 /* 102 * Convenience data structures. 103 */ 104 union ieee_ext_u { 105 long double extu_ld; 106 struct ieee_ext extu_ext; 107 }; 108 109 #define extu_exp extu_ext.ext_exp 110 #define extu_sign extu_ext.ext_sign 111 #define extu_fracl extu_ext.ext_fracl 112 #define extu_frach extu_ext.ext_frach 113 114 #define LDBL_NBIT 0x80000000 115 #define mask_nbit_l(u) ((u).extu_frach &= ~LDBL_NBIT) 116 #endif /* !__mc68010__ || _KERNEL */ 117 118 #endif /* __68K_IEEE_H_INCLUDED */ 119