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/*  bitfield.h
 *
 *  This include file contains all bit field manipulation routines.
 *
 *  COPYRIGHT (c) 1989-1999.
 *  On-Line Applications Research Corporation (OAR).
 *
 *  The license and distribution terms for this file may be
 *  found in the file LICENSE in this distribution or at
 *  http://www.OARcorp.com/rtems/license.html.
 *
 *  $Id: bitfield.h,v 1.2 2001-09-27 11:59:32 chris Exp $
 */
 
#ifndef __RTEMS_BITFIELD_h
#define __RTEMS_BITFIELD_h
 
#ifdef __cplusplus
extern "C" {
#endif
 
/*
 *  _Bitfield_Find_first_bit
 *
 *  DESCRIPTION:
 *
 *  This routine returns the bit_number of the first bit set
 *  in the specified value.  The correspondence between bit_number
 *  and actual bit position is processor dependent.  The search for
 *  the first bit set may run from most to least significant bit
 *  or vice-versa.
 *
 *  NOTE:
 *
 *  This routine is used when the executing thread is removed
 *  from the ready state and, as a result, its performance has a
 *  significant impact on the performance of the executive as a whole.
 */
 
#if ( CPU_USE_GENERIC_BITFIELD_DATA == TRUE )
 
#ifndef SCORE_INIT
extern const unsigned char __log2table[256];
#else
const unsigned char __log2table[256] = {
    7, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4,
    3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
    2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
    2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
#endif
 
#endif
 
#if ( CPU_USE_GENERIC_BITFIELD_CODE == FALSE )
 
#define _Bitfield_Find_first_bit( _value, _bit_number ) \
        _CPU_Bitfield_Find_first_bit( _value, _bit_number )
 
#else
 
/*
 *  The following must be a macro because if a CPU specific version
 *  is used it will most likely use inline assembly.
 */
 
#define _Bitfield_Find_first_bit( _value, _bit_number ) \
  { \
    register unsigned32 __value = (unsigned32) (_value); \
    register const unsigned char *__p = __log2table; \
    \
    if ( __value < 0x100 ) \
      (_bit_number) = __p[ __value ] + 8; \
    else \
      (_bit_number) = __p[ __value >> 8 ]; \
  }
 
#endif
 
#ifdef __cplusplus
}
#endif
 
#endif
/* end of include file */

Line No.	Rev	Author	Line
1	30	unneback	`/* bitfield.h`
2			`*`
3			`* This include file contains all bit field manipulation routines.`
4			`*`
5			`* COPYRIGHT (c) 1989-1999.`
6			`* On-Line Applications Research Corporation (OAR).`
7			`*`
8			`* The license and distribution terms for this file may be`
9			`* found in the file LICENSE in this distribution or at`
10			`* http://www.OARcorp.com/rtems/license.html.`
11			`*`
12			`* $Id: bitfield.h,v 1.2 2001-09-27 11:59:32 chris Exp $`
13			`*/`
14
15			`#ifndef __RTEMS_BITFIELD_h`
16			`#define __RTEMS_BITFIELD_h`
17
18			`#ifdef __cplusplus`
19			`extern "C" {`
20			`#endif`
21
22			`/*`
23			`* _Bitfield_Find_first_bit`
24			`*`
25			`* DESCRIPTION:`
26			`*`
27			`* This routine returns the bit_number of the first bit set`
28			`* in the specified value. The correspondence between bit_number`
29			`* and actual bit position is processor dependent. The search for`
30			`* the first bit set may run from most to least significant bit`
31			`* or vice-versa.`
32			`*`
33			`* NOTE:`
34			`*`
35			`* This routine is used when the executing thread is removed`
36			`* from the ready state and, as a result, its performance has a`
37			`* significant impact on the performance of the executive as a whole.`
38			`*/`
39
40			`#if ( CPU_USE_GENERIC_BITFIELD_DATA == TRUE )`
41
42			`#ifndef SCORE_INIT`
43			`extern const unsigned char __log2table[256];`
44			`#else`
45			`const unsigned char __log2table[256] = {`
46			`7, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4,`
47			`3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,`
48			`2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,`
49			`2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,`
50			`1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,`
51			`1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,`
52			`1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,`
53			`1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,`
54			`0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,`
55			`0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,`
56			`0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,`
57			`0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,`
58			`0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,`
59			`0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,`
60			`0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,`
61			`0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0`
62			`};`
63			`#endif`
64
65			`#endif`
66
67			`#if ( CPU_USE_GENERIC_BITFIELD_CODE == FALSE )`
68
69			`#define _Bitfield_Find_first_bit( _value, _bit_number ) \`
70			`_CPU_Bitfield_Find_first_bit( _value, _bit_number )`
71
72			`#else`
73
74			`/*`
75			`* The following must be a macro because if a CPU specific version`
76			`* is used it will most likely use inline assembly.`
77			`*/`
78
79			`#define _Bitfield_Find_first_bit( _value, _bit_number ) \`
80			`{ \`
81			`register unsigned32 __value = (unsigned32) (_value); \`
82			`register const unsigned char *__p = __log2table; \`
83			`\`
84			`if ( __value < 0x100 ) \`
85			`(_bit_number) = __p[ __value ] + 8; \`
86			`else \`
87			`(_bit_number) = __p[ __value >> 8 ]; \`
88			`}`
89
90			`#endif`
91
92			`#ifdef __cplusplus`
93			`}`
94			`#endif`
95
96			`#endif`
97			`/* end of include file */`

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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [exec/] [score/] [include/] [rtems/] [score/] [bitfield.h] - Blame information for rev 587