Annotation of sys/arch/hppa/spmath/fpbits.h, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: fpbits.h,v 1.6 2002/09/20 19:26:59 mickey Exp $ */
2: /*
3: (c) Copyright 1986 HEWLETT-PACKARD COMPANY
4: To anyone who acknowledges that this file is provided "AS IS"
5: without any express or implied warranty:
6: permission to use, copy, modify, and distribute this file
7: for any purpose is hereby granted without fee, provided that
8: the above copyright notice and this notice appears in all
9: copies, and that the name of Hewlett-Packard Company not be
10: used in advertising or publicity pertaining to distribution
11: of the software without specific, written prior permission.
12: Hewlett-Packard Company makes no representations about the
13: suitability of this software for any purpose.
14: */
15: /* @(#)fpbits.h: Revision: 1.6.88.1 Date: 93/12/07 15:06:21 */
16:
17: /*
18: * These macros are designed to be portable to all machines that have
19: * a wordsize greater than or equal to 32 bits that support the portable
20: * C compiler and the standard C preprocessor. Wordsize (default 32)
21: * and bitfield assignment (default left-to-right, unlike VAX, PDP-11)
22: * should be predefined using the constants HOSTWDSZ and BITFRL and
23: * the C compiler "-D" flag (e.g., -DHOSTWDSZ=36 -DBITFLR for the DEC-20).
24: * Note that the macro arguments assume that the integer being referenced
25: * is a 32-bit integer (right-justified on the 20) and that bit 0 is the
26: * most significant bit.
27: */
28:
29: #ifndef HOSTWDSZ
30: #define HOSTWDSZ 32
31: #endif
32:
33:
34: /*########################### Macros ######################################*/
35:
36: /*-------------------------------------------------------------------------
37: * NewDeclareBitField_Reference - Declare a structure similar to the simulator
38: * function "DeclBitfR" except its use is restricted to occur within a larger
39: * enclosing structure or union definition. This declaration is an unnamed
40: * structure with the argument, name, as the member name and the argument,
41: * uname, as the element name.
42: *----------------------------------------------------------------------- */
43: #define Bitfield_extract(start, length, object) \
44: ((object) >> (HOSTWDSZ - (start) - (length)) & \
45: ((unsigned)-1 >> (HOSTWDSZ - (length))))
46:
47: #define Bitfield_signed_extract(start, length, object) \
48: ((int)((object) << start) >> (HOSTWDSZ - (length)))
49:
50: #define Bitfield_mask(start, len, object) \
51: ((object) & (((unsigned)-1 >> (HOSTWDSZ-len)) << (HOSTWDSZ-start-len)))
52:
53: #define Bitfield_deposit(value,start,len,object) object = \
54: ((object) & ~(((unsigned)-1 >> (HOSTWDSZ-(len))) << (HOSTWDSZ-(start)-(len)))) | \
55: (((value) & ((unsigned)-1 >> (HOSTWDSZ-(len)))) << (HOSTWDSZ-(start)-(len)))
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