118 lines
3.9 KiB
C
118 lines
3.9 KiB
C
/* $NetBSD: ieee.h,v 1.11 2010/09/15 16:11:28 christos Exp $ */
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/*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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*
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* All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Lawrence Berkeley Laboratory.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)ieee.h 8.1 (Berkeley) 6/11/93
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*/
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/*
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* ieee.h defines the machine-dependent layout of the machine's IEEE
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* floating point. It does *not* define (yet?) any of the rounding
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* mode bits, exceptions, and so forth.
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*/
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#include <sys/ieee754.h>
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#define EXT_EXPBITS 15
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#define EXT_FRACHBITS 32
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#define EXT_FRACLBITS 32
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#define EXT_FRACBITS (EXT_FRACLBITS + EXT_FRACHBITS)
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#define EXT_TO_ARRAY32(u, a) do { \
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(a)[0] = (uint32_t)(u).extu_ext.ext_fracl; \
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(a)[1] = (uint32_t)(u).extu_ext.ext_frach; \
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} while(/*CONSTCOND*/0)
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/*
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* struct ieee_ext is the raw storage layout of the 80-bit
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* extended-precision type as implemented by the FPU. Per the
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* respective ABI specifications, it is followed by a tail padding of
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*
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* amd64: 48 bits,
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* i386: 16 bits.
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*/
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struct ieee_ext {
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u_int ext_fracl:EXT_FRACLBITS;
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u_int ext_frach:EXT_FRACHBITS;
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#if 0
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u_int ext_int:1;
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#endif
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u_int ext_exp:EXT_EXPBITS;
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u_int ext_sign:1;
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};
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/*
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* Floats whose exponent is in [1..INFNAN) (of whatever type) are
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* `normal'. Floats whose exponent is INFNAN are either Inf or NaN.
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* Floats whose exponent is zero are either zero (iff all fraction
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* bits are zero) or subnormal values.
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*
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* A NaN is a `signalling NaN' if its QUIETNAN bit is clear in its
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* high fraction; if the bit is set, it is a `quiet NaN'.
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*/
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#define EXT_EXP_INFNAN 0x7fff
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#define EXT_EXP_INF 0x7fff
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#define EXT_EXP_NAN 0x7fff
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#if 0
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#define SNG_QUIETNAN (1 << 22)
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#define DBL_QUIETNAN (1 << 19)
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#define EXT_QUIETNAN (1 << 30)
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#endif
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/*
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* Exponent biases.
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*/
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#define EXT_EXP_BIAS 16383
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/*
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* Convenience data structures.
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*/
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union ieee_ext_u {
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long double extu_ld;
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struct ieee_ext extu_ext;
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};
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#define extu_exp extu_ext.ext_exp
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#define extu_sign extu_ext.ext_sign
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#define extu_fracl extu_ext.ext_fracl
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#define extu_frach extu_ext.ext_frach
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#define LDBL_NBIT 0x80000000
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#define mask_nbit_l(u) ((u).extu_frach &= ~LDBL_NBIT)
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