sys/arch/hppa/spmath/fpbits.h

   1 /*      $NetBSD$        */
   2
   3 /*      $OpenBSD: fpbits.h,v 1.4 2001/03/29 03:58:18 mickey Exp $       */
   4
   5 /*
   6  * Copyright 1996 1995 by Open Software Foundation, Inc.
   7  *              All Rights Reserved
   8  *
   9  * Permission to use, copy, modify, and distribute this software and
  10  * its documentation for any purpose and without fee is hereby granted,
  11  * provided that the above copyright notice appears in all copies and
  12  * that both the copyright notice and this permission notice appear in
  13  * supporting documentation.
  14  *
  15  * OSF DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
  16  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  17  * FOR A PARTICULAR PURPOSE.
  18  *
  19  * IN NO EVENT SHALL OSF BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
  20  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  21  * LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
  22  * NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
  23  * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  24  */
  25 /*
  26  * pmk1.1
  27  */
  28 /*
  29  * (c) Copyright 1986 HEWLETT-PACKARD COMPANY
  30  *
  31  * To anyone who acknowledges that this file is provided "AS IS"
  32  * without any express or implied warranty:
  33  *     permission to use, copy, modify, and distribute this file
  34  * for any purpose is hereby granted without fee, provided that
  35  * the above copyright notice and this notice appears in all
  36  * copies, and that the name of Hewlett-Packard Company not be
  37  * used in advertising or publicity pertaining to distribution
  38  * of the software without specific, written prior permission.
  39  * Hewlett-Packard Company makes no representations about the
  40  * suitability of this software for any purpose.
  41  */
  42
  43 /*
  44  *  These macros are designed to be portable to all machines that have
  45  *  a wordsize greater than or equal to 32 bits that support the portable
  46  *  C compiler and the standard C preprocessor.  Wordsize (default 32)
  47  *  and bitfield assignment (default left-to-right,  unlike VAX, PDP-11)
  48  *  should be predefined using the constants HOSTWDSZ and BITFRL and
  49  *  the C compiler "-D" flag (e.g., -DHOSTWDSZ=36 -DBITFLR for the DEC-20).
  50  *  Note that the macro arguments assume that the integer being referenced
  51  *  is a 32-bit integer (right-justified on the 20) and that bit 0 is the
  52  *  most significant bit.
  53  */
  54
  55 #ifndef HOSTWDSZ
  56 #define HOSTWDSZ        32
  57 #endif
  58
  59
  60 /*###########################  Macros  ######################################*/
  61
  62 /*-------------------------------------------------------------------------
  63  * NewDeclareBitField_Reference - Declare a structure similar to the simulator
  64  * function "DeclBitfR" except its use is restricted to occur within a larger
  65  * enclosing structure or union definition.  This declaration is an unnamed
  66  * structure with the argument, name, as the member name and the argument,
  67  * uname, as the element name.
  68  *----------------------------------------------------------------------- */
  69 #define Bitfield_extract(start, length, object)         \
  70     ((object) >> (HOSTWDSZ - (start) - (length)) &      \
  71     ((unsigned)-1 >> (HOSTWDSZ - (length))))
  72
  73 #define Bitfield_signed_extract(start, length, object) \
  74     ((int)((object) << start) >> (HOSTWDSZ - (length)))
  75
  76 #define Bitfield_mask(start, len, object)               \
  77     ((object) & (((unsigned)-1 >> (HOSTWDSZ-len)) << (HOSTWDSZ-start-len)))
  78
  79 #define Bitfield_deposit(value,start,len,object)  object = \
  80     ((object) & ~(((unsigned)-1 >> (HOSTWDSZ-(len))) << (HOSTWDSZ-(start)-(len)))) | \
  81     (((value) & ((unsigned)-1 >> (HOSTWDSZ-(len)))) << (HOSTWDSZ-(start)-(len)))
  82