/* $NetBSD: ieee.h,v 1.9.32.1 2007/05/07 19:49:10 pavel Exp $ */ /* * 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 */ /* * 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. */ #include #define EXT_EXPBITS 15 #define EXT_FRACHBITS 32 #define EXT_FRACLBITS 32 #define EXT_FRACBITS (EXT_FRACLBITS + EXT_FRACHBITS) #define EXT_TO_ARRAY32(u, a) do { \ (a)[0] = (uint32_t)(u).extu_ext.ext_fracl; \ (a)[1] = (uint32_t)(u).extu_ext.ext_frach; \ } while(/*CONSTCOND*/0) /* * struct ieee_ext is the raw storage layout of the 80-bit * extended-precision type as implemented by the FPU. Per the * respective ABI specifications, it is followed by a tail padding of * * amd64: 48 bits, * i386: 16 bits. */ struct ieee_ext { u_int ext_fracl:EXT_FRACLBITS; u_int ext_frach:EXT_FRACHBITS; #if 0 u_int ext_int:1; #endif u_int ext_exp:EXT_EXPBITS; u_int ext_sign:1; }; /* * 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 EXT_EXP_INFNAN 32767 #if 0 #define SNG_QUIETNAN (1 << 22) #define DBL_QUIETNAN (1 << 19) #define EXT_QUIETNAN (1 << 30) #endif /* * Exponent biases. */ #define EXT_EXP_BIAS 16383 /* * Convenience data structures. */ union ieee_ext_u { long double extu_ld; struct ieee_ext extu_ext; };