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 $ */
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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 <sys/ieee754.h>
|
||
|
|
|
||
|
|
#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 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)
|