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1 | /* |
1 | /* |
2 | * Copyright (C) 2006 Ondrej Palkovsky |
2 | * Copyright (C) 2006 Ondrej Palkovsky |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | #ifndef _BITOPS_H_ |
29 | #ifndef _BITOPS_H_ |
30 | #define _BITOPS_H_ |
30 | #define _BITOPS_H_ |
31 | 31 | ||
32 | #include <typedefs.h> |
32 | #include <typedefs.h> |
33 | 33 | ||
34 | 34 | ||
35 | /** Return position of first non-zero bit from left. |
35 | /** Return position of first non-zero bit from left (i.e. [log_2(arg)]). |
36 | * |
36 | * |
37 | * If number is zero, it returns 0 |
37 | * If number is zero, it returns 0 |
38 | */ |
38 | */ |
39 | static inline int fnzb32(__u32 arg) |
39 | static inline int fnzb32(__u32 arg) |
40 | { |
40 | { |
41 | int n = 0; |
41 | int n = 0; |
42 | 42 | ||
43 | if (arg >> 16) { arg >>= 16;n += 16;} |
43 | if (arg >> 16) { arg >>= 16;n += 16;} |
44 | if (arg >> 8) { arg >>= 8; n += 8;} |
44 | if (arg >> 8) { arg >>= 8; n += 8;} |
45 | if (arg >> 4) { arg >>= 4; n += 4;} |
45 | if (arg >> 4) { arg >>= 4; n += 4;} |
46 | if (arg >> 2) { arg >>= 2; n+=2;} |
46 | if (arg >> 2) { arg >>= 2; n+=2;} |
47 | if (arg >> 1) { arg >>= 1; n+=1;} |
47 | if (arg >> 1) { arg >>= 1; n+=1;} |
48 | return n; |
48 | return n; |
49 | } |
49 | } |
50 | 50 | ||
51 | static inline int fnzb64(__u64 arg) |
51 | static inline int fnzb64(__u64 arg) |
52 | { |
52 | { |
53 | int n = 0; |
53 | int n = 0; |
54 | 54 | ||
55 | if (arg >> 32) { arg >>= 32;n += 32;} |
55 | if (arg >> 32) { arg >>= 32;n += 32;} |
56 | return n + fnzb32((__u32) arg); |
56 | return n + fnzb32((__u32) arg); |
57 | } |
57 | } |
58 | 58 | ||
59 | #define fnzb(x) fnzb32(x) |
59 | #define fnzb(x) fnzb32(x) |
60 | 60 | ||
61 | #endif |
61 | #endif |
62 | 62 |