1 /* $NetBSD: ieee.h,v 1.9 2013/02/14 08:56:21 matt 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 #ifndef _MIPS_IEEE_H 50 #define _MIPS_IEEE_H 51 52 #include <sys/ieee754.h> 53 54 /* 55 * The SPARC architecture defines the following IEEE 754 compliant 56 * 128-bit extended-precision format, which is supported only by the 57 * v9 toolchain. 58 */ 59 60 #if defined(__mips_n32) || defined(__mips_n64) 61 62 #define EXT_EXPBITS 15 63 #define EXT_FRACHBITS 16 64 #define EXT_FRACHMBITS 32 65 #define EXT_FRACLMBITS 32 66 #define EXT_FRACLBITS 32 67 #define EXT_FRACBITS (EXT_FRACLBITS + EXT_FRACLMBITS + EXT_FRACHMBITS + EXT_FRACHBITS) 68 69 #define EXT_TO_ARRAY32(u, a) do { \ 70 (a)[0] = (uint32_t)(u).extu_ext.ext_fracl; \ 71 (a)[1] = (uint32_t)(u).extu_ext.ext_fraclm; \ 72 (a)[2] = (uint32_t)(u).extu_ext.ext_frachm; \ 73 (a)[3] = (uint32_t)(u).extu_ext.ext_frach; \ 74 } while(/*CONSTCOND*/0) 75 76 struct ieee_ext { 77 #if _BYTE_ORDER == _BIG_ENDIAN 78 u_int ext_sign:1; 79 u_int ext_exp:EXT_EXPBITS; 80 u_int ext_frach:EXT_FRACHBITS; 81 u_int ext_frachm; 82 u_int ext_fraclm; 83 u_int ext_fracl; 84 #else 85 u_int ext_fracl; 86 u_int ext_fraclm; 87 u_int ext_frachm; 88 u_int ext_frach:EXT_FRACHBITS; 89 u_int ext_exp:EXT_EXPBITS; 90 u_int ext_sign:1; 91 #endif 92 }; 93 94 /* 95 * Floats whose exponent is in [1..INFNAN) (of whatever type) are 96 * `normal'. Floats whose exponent is INFNAN are either Inf or NaN. 97 * Floats whose exponent is zero are either zero (iff all fraction 98 * bits are zero) or subnormal values. 99 * 100 * A NaN is a `signalling NaN' if its QUIETNAN bit is clear in its 101 * high fraction; if the bit is set, it is a `quiet NaN'. 102 */ 103 #define EXT_EXP_INFNAN 0x7fff 104 #define EXT_EXP_INF 0x7fff 105 #define EXT_EXP_NAN 0x7fff 106 107 #if 0 108 #define SNG_QUIETNAN (1 << 22) 109 #define DBL_QUIETNAN (1 << 19) 110 #define EXT_QUIETNAN (1 << 15) 111 #endif 112 113 /* 114 * Exponent biases. 115 */ 116 #define EXT_EXP_BIAS 16383 117 118 /* 119 * Convenience data structures. 120 */ 121 union ieee_ext_u { 122 long double extu_ld; 123 struct ieee_ext extu_ext; 124 }; 125 126 #define extu_exp extu_ext.ext_exp 127 #define extu_sign extu_ext.ext_sign 128 #define extu_fracl extu_ext.ext_fracl 129 #define extu_fraclm extu_ext.ext_fraclm 130 #define extu_frachm extu_ext.ext_frachm 131 #define extu_frach extu_ext.ext_frach 132 133 #define LDBL_IMPLICIT_NBIT 1 /* our NBIT is implicit */ 134 135 #endif /* __mips_n32 || __mips_n64 */ 136 137 #endif /* _MIPS_IEEE_H */ 138