Home | History | Annotate | Download | only in machine
      1 /*	$OpenBSD: ieee.h,v 1.4 2011/11/08 17:06:51 deraadt Exp $	*/
      2 /*	$NetBSD: ieee.h,v 1.2 2001/02/21 17:43:50 bjh21 Exp $	*/
      3 
      4 /*
      5  * Copyright (c) 1992, 1993
      6  *	The Regents of the University of California.  All rights reserved.
      7  *
      8  * This software was developed by the Computer Systems Engineering group
      9  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
     10  * contributed to Berkeley.
     11  *
     12  * All advertising materials mentioning features or use of this software
     13  * must display the following acknowledgement:
     14  *	This product includes software developed by the University of
     15  *	California, Lawrence Berkeley Laboratory.
     16  *
     17  * Redistribution and use in source and binary forms, with or without
     18  * modification, are permitted provided that the following conditions
     19  * are met:
     20  * 1. Redistributions of source code must retain the above copyright
     21  *    notice, this list of conditions and the following disclaimer.
     22  * 2. Redistributions in binary form must reproduce the above copyright
     23  *    notice, this list of conditions and the following disclaimer in the
     24  *    documentation and/or other materials provided with the distribution.
     25  * 3. All advertising materials mentioning features or use of this software
     26  *    must display the following acknowledgement:
     27  *	This product includes software developed by the University of
     28  *	California, Berkeley and its contributors.
     29  * 4. Neither the name of the University nor the names of its contributors
     30  *    may be used to endorse or promote products derived from this software
     31  *    without specific prior written permission.
     32  *
     33  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     34  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     35  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     36  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     37  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     38  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     39  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     40  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     41  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     42  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     43  * SUCH DAMAGE.
     44  *
     45  *	@(#)ieee.h	8.1 (Berkeley) 6/11/93
     46  */
     47 
     48 #ifndef _MACHINE_IEEE_H_
     49 #define _MACHINE_IEEE_H_
     50 
     51 #include <sys/types.h>
     52 
     53 __BEGIN_DECLS
     54 
     55 #define SNG_EXPBITS	8
     56 #define SNG_FRACBITS	23
     57 
     58 #define SNG_EXP_INFNAN	255
     59 #define SNG_EXP_BIAS	127
     60 
     61 struct ieee_single {
     62   unsigned sng_frac:23;
     63   unsigned sng_exp:8;
     64   unsigned sng_sign:1;
     65 };
     66 
     67 #define DBL_EXPBITS	11
     68 #define DBL_FRACHBITS	20
     69 #define DBL_FRACLBITS	32
     70 #define DBL_FRACBITS	52
     71 
     72 #define DBL_EXP_INFNAN	2047
     73 #define DBL_EXP_BIAS	1023
     74 
     75 struct ieee_double {
     76   unsigned dbl_fracl;
     77   unsigned dbl_frach:20;
     78   unsigned dbl_exp:11;
     79   unsigned dbl_sign:1;
     80 };
     81 
     82 #if __LP64__
     83 
     84 /* 64-bit Android uses ld128 long doubles. */
     85 
     86 #define EXT_EXPBITS	15
     87 #define EXT_FRACHBITS	16
     88 #define EXT_FRACHMBITS	32
     89 #define EXT_FRACLMBITS	32
     90 #define EXT_FRACLBITS	32
     91 #define EXT_FRACBITS	112
     92 
     93 #define EXT_EXP_INFNAN	32767
     94 #define EXT_EXP_BIAS	16383
     95 
     96 #define EXT_IMPLICIT_NBIT
     97 
     98 #define EXT_TO_ARRAY32(p, a) do { \
     99   (a)[0] = (uint32_t)(p)->ext_fracl; \
    100   (a)[1] = (uint32_t)(p)->ext_fraclm; \
    101   (a)[2] = (uint32_t)(p)->ext_frachm; \
    102   (a)[3] = (uint32_t)(p)->ext_frach; \
    103 } while(0)
    104 
    105 struct ieee_ext {
    106   unsigned ext_fracl;
    107   unsigned ext_fraclm;
    108   unsigned ext_frachm;
    109   unsigned ext_frach:16;
    110   unsigned ext_exp:15;
    111   unsigned ext_sign:1;
    112 };
    113 
    114 #endif
    115 
    116 __END_DECLS
    117 
    118 #endif /* _MACHINE_IEEE_H_ */
    119