sys/arch/sparc/include/ieee.h

   1 /*      $NetBSD: ieee.h,v 1.11 2007/02/03 16:44:45 christos Exp $       */
   2
   3 /*
   4  * Copyright (c) 1992, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This software was developed by the Computer Systems Engineering group
   8  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
   9  * contributed to Berkeley.
  10  *
  11  * All advertising materials mentioning features or use of this software
  12  * must display the following acknowledgement:
  13  *      This product includes software developed by the University of
  14  *      California, Lawrence Berkeley Laboratory.
  15  *
  16  * Redistribution and use in source and binary forms, with or without
  17  * modification, are permitted provided that the following conditions
  18  * are met:
  19  * 1. Redistributions of source code must retain the above copyright
  20  *    notice, this list of conditions and the following disclaimer.
  21  * 2. Redistributions in binary form must reproduce the above copyright
  22  *    notice, this list of conditions and the following disclaimer in the
  23  *    documentation and/or other materials provided with the distribution.
  24  * 3. Neither the name of the University nor the names of its contributors
  25  *    may be used to endorse or promote products derived from this software
  26  *    without specific prior written permission.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  38  * SUCH DAMAGE.
  39  *
  40  *      @(#)ieee.h      8.1 (Berkeley) 6/11/93
  41  */
  42
  43 /*
  44  * ieee.h defines the machine-dependent layout of the machine's IEEE
  45  * floating point.  It does *not* define (yet?) any of the rounding
  46  * mode bits, exceptions, and so forth.
  47  */
  48
  49 #include <sys/ieee754.h>
  50
  51 /*
  52  * The SPARC architecture defines the following IEEE 754 compliant
  53  * 128-bit extended-precision format, which is supported only by the
  54  * v9 toolchain.
  55  */
  56
  57 #if defined(__arch64__) || defined(_KERNEL)
  58
  59 #define EXT_EXPBITS     15
  60 #define EXT_FRACHBITS   16
  61 #define EXT_FRACHMBITS  32
  62 #define EXT_FRACLMBITS  32
  63 #define EXT_FRACLBITS   32
  64 #define EXT_FRACBITS    (EXT_FRACLBITS + EXT_FRACLMBITS + EXT_FRACHMBITS + EXT_FRACHBITS)
  65
  66 #define EXT_TO_ARRAY32(u, a) do {                       \
  67         (a)[0] = (uint32_t)(u).extu_ext.ext_fracl;      \
  68         (a)[1] = (uint32_t)(u).extu_ext.ext_fraclm;     \
  69         (a)[2] = (uint32_t)(u).extu_ext.ext_frachm;     \
  70         (a)[3] = (uint32_t)(u).extu_ext.ext_frach;      \
  71 } while(/*CONSTCOND*/0)
  72
  73 struct ieee_ext {
  74         u_int   ext_sign:1;
  75         u_int   ext_exp:EXT_EXPBITS;
  76         u_int   ext_frach:EXT_FRACHBITS;
  77         u_int   ext_frachm;
  78         u_int   ext_fraclm;
  79         u_int   ext_fracl;
  80 };
  81
  82 /*
  83  * Floats whose exponent is in [1..INFNAN) (of whatever type) are
  84  * `normal'.  Floats whose exponent is INFNAN are either Inf or NaN.
  85  * Floats whose exponent is zero are either zero (iff all fraction
  86  * bits are zero) or subnormal values.
  87  *
  88  * A NaN is a `signalling NaN' if its QUIETNAN bit is clear in its
  89  * high fraction; if the bit is set, it is a `quiet NaN'.
  90  */
  91 #define EXT_EXP_INFNAN  32767
  92
  93 #if 0
  94 #define SNG_QUIETNAN    (1 << 22)
  95 #define DBL_QUIETNAN    (1 << 19)
  96 #define EXT_QUIETNAN    (1 << 15)
  97 #endif
  98
  99 /*
 100  * Exponent biases.
 101  */
 102 #define EXT_EXP_BIAS    16383
 103
 104 /*
 105  * Convenience data structures.
 106  */
 107 union ieee_ext_u {
 108         long double             extu_ld;
 109         struct ieee_ext         extu_ext;
 110 };
 111 #endif /* __arch64__ || _KERNEL */