1 /* $NetBSD: ieee.h,v 1.17 2013/12/15 03:45:07 christos 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 /* 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 /* 52 * The SPARC architecture defines the following IEEE 754 compliant 53 * 128-bit extended-precision format, which is supported only by the 54 * v9 toolchain. 55 */ 56 57 #if defined(__arch64__) || defined(_KERNEL) 58 59 #define EXT_EXPBITS 15 60 #define EXT_FRACHBITS (16+32) 61 #define EXT_FRACLBITS (32+32) 62 #define EXT_FRACBITS (EXT_FRACLBITS + EXT_FRACHBITS) 63 64 struct ieee_ext { 65 /*LINTED35*/ uint64_t ext_sign:1; 66 /*LINTED35*/ uint64_t ext_exp:EXT_EXPBITS; 67 /*LINTED35*/ uint64_t ext_frach:EXT_FRACHBITS; 68 uint64_t ext_fracl; 69 }; 70 __CTASSERT(sizeof(struct ieee_ext) == 16); 71 72 /* 73 * Copy all mantissa bits to an array of uint32_t big enough to hold them all. 74 * This is an insane API (seems to only be needed in gdtoa). 75 */ 76 #define EXT_TO_ARRAY32(u, a) do { \ 77 (a)[0] = (uint32_t)((u).extu_ext.ext_fracl & 0x0ffffffffL); \ 78 (a)[1] = (uint32_t)((u).extu_ext.ext_fracl >> 32); \ 79 (a)[2] = (uint32_t)((u).extu_ext.ext_frach & 0x0ffffffffL); \ 80 (a)[3] = (uint32_t)((u).extu_ext.ext_frach >> 32) & 0x0ffff; \ 81 } while(/*CONSTCOND*/0) 82 83 /* 84 * Floats whose exponent is in [1..INFNAN) (of whatever type) are 85 * `normal'. Floats whose exponent is INFNAN are either Inf or NaN. 86 * Floats whose exponent is zero are either zero (iff all fraction 87 * bits are zero) or subnormal values. 88 * 89 * A NaN is a `signalling NaN' if its QUIETNAN bit is clear in its 90 * high fraction; if the bit is set, it is a `quiet NaN'. 91 */ 92 #define EXT_EXP_INFNAN 0x7fff 93 #define EXT_EXP_INF 0x7fff 94 #define EXT_EXP_NAN 0x7fff 95 96 #if 0 97 #define SNG_QUIETNAN (1 << 22) 98 #define DBL_QUIETNAN (1 << 19) 99 #define EXT_QUIETNAN (1 << 15) 100 #endif 101 102 /* 103 * Exponent biases. 104 */ 105 #define EXT_EXP_BIAS 16383 106 107 /* 108 * Convenience data structures. 109 */ 110 union ieee_ext_u { 111 long double extu_ld; 112 struct ieee_ext extu_ext; 113 }; 114 115 #define extu_exp extu_ext.ext_exp 116 #define extu_sign extu_ext.ext_sign 117 #define extu_fracl extu_ext.ext_fracl 118 #define extu_fraclm extu_ext.ext_fraclm 119 #define extu_frachm extu_ext.ext_frachm 120 #define extu_frach extu_ext.ext_frach 121 122 #define LDBL_IMPLICIT_NBIT 1 123 124 #endif /* __arch64__ || _KERNEL */ 125