arch/parisc/math-emu/fpbits.h

   1 /*
   2  * Linux/PA-RISC Project (http://www.parisc-linux.org/)
   3  *
   4  * Floating-point emulation code
   5  *  Copyright (C) 2001 Hewlett-Packard (Paul Bame) <bame@debian.org>
   6  *
   7  *    This program is free software; you can redistribute it and/or modify
   8  *    it under the terms of the GNU General Public License as published by
   9  *    the Free Software Foundation; either version 2, or (at your option)
  10  *    any later version.
  11  *
  12  *    This program is distributed in the hope that it will be useful,
  13  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *    GNU General Public License for more details.
  16  *
  17  *    You should have received a copy of the GNU General Public License
  18  *    along with this program; if not, write to the Free Software
  19  *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 #ifdef __NO_PA_HDRS
  23     PA header file -- do not include this header file for non-PA builds.
  24 #endif
  25
  26
  27 /*
  28  *  These macros are designed to be portable to all machines that have
  29  *  a wordsize greater than or equal to 32 bits that support the portable
  30  *  C compiler and the standard C preprocessor.  Wordsize (default 32)
  31  *  and bitfield assignment (default left-to-right,  unlike VAX, PDP-11)
  32  *  should be predefined using the constants HOSTWDSZ and BITFRL and
  33  *  the C compiler "-D" flag (e.g., -DHOSTWDSZ=36 -DBITFLR for the DEC-20).
  34  *  Note that the macro arguments assume that the integer being referenced
  35  *  is a 32-bit integer (right-justified on the 20) and that bit 0 is the
  36  *  most significant bit.
  37  */
  38
  39 #ifndef HOSTWDSZ
  40 #define HOSTWDSZ        32
  41 #endif
  42
  43
  44 /*###########################  Macros  ######################################*/
  45
  46 /*-------------------------------------------------------------------------
  47  * NewDeclareBitField_Reference - Declare a structure similar to the simulator
  48  * function "DeclBitfR" except its use is restricted to occur within a larger
  49  * enclosing structure or union definition.  This declaration is an unnamed
  50  * structure with the argument, name, as the member name and the argument,
  51  * uname, as the element name.
  52  *----------------------------------------------------------------------- */
  53 #define Bitfield_extract(start, length, object)         \
  54     ((object) >> (HOSTWDSZ - (start) - (length)) &      \
  55     ((unsigned)-1 >> (HOSTWDSZ - (length))))
  56
  57 #define Bitfield_signed_extract(start, length, object) \
  58     ((int)((object) << start) >> (HOSTWDSZ - (length)))
  59
  60 #define Bitfield_mask(start, len, object)               \
  61     ((object) & (((unsigned)-1 >> (HOSTWDSZ-len)) << (HOSTWDSZ-start-len)))
  62
  63 #define Bitfield_deposit(value,start,len,object)  object = \
  64     ((object) & ~(((unsigned)-1 >> (HOSTWDSZ-len)) << (HOSTWDSZ-start-len))) | \
  65     (((value) & ((unsigned)-1 >> (HOSTWDSZ-len))) << (HOSTWDSZ-start-len))