* Copyright (c) 1992, 1993

/* $NetBSD: ieee.h,v 1.17 2024/01/22 14:37:25 kre 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
*/

#ifndef __68K_IEEE_H_INCLUDED
#define __68K_IEEE_H_INCLUDED

/*
* 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 <sys/ieee754.h>

#if !defined(__mc68010__) || defined(_KERNEL)
#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 {
u_int ext_sign:1;
u_int ext_exp:EXT_EXPBITS;
u_int ext_zero:16;
#if 0
u_int ext_int:1;
#endif
u_int ext_frach;
u_int ext_fracl;
};

/*
* Extended floats whose exponent is in [0..INFNAN) and have their
* explicit integer bit (the most significant bit of the fraction)
* set 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 0x7fff
#define EXT_EXP_INF 0x7fff
#define EXT_EXP_NAN 0x7fff

#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;
};

#define extu_exp extu_ext.ext_exp
#define extu_sign extu_ext.ext_sign
#define extu_fracl extu_ext.ext_fracl
#define extu_frach extu_ext.ext_frach

#define LDBL_NBIT 0x80000000
#define mask_nbit_l(u) ((u).extu_frach &= ~LDBL_NBIT)
#endif /* !__mc68010__ || _KERNEL */

#endif /* __68K_IEEE_H_INCLUDED */