projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 4df87bb7 CM |
1 | /* |
| 2 | * lib/clz_ctz.c | |
| 3 | * | |
| 4 | * Copyright (C) 2013 Chanho Min <[email protected]> | |
| 5 | * | |
| 6 | * This program is free software; you can redistribute it and/or modify | |
| 7 | * it under the terms of the GNU General Public License version 2 as | |
| 8 | * published by the Free Software Foundation. | |
| 9 | * | |
| 10 | * __c[lt]z[sd]i2 can be overridden by linking arch-specific versions. | |
| 11 | */ | |
| 12 | ||
| 13 | #include <linux/export.h> | |
| 14 | #include <linux/kernel.h> | |
| 15 | ||
| 16 | int __weak __ctzsi2(int val) | |
| 17 | { | |
| 18 | return __ffs(val); | |
| 19 | } | |
| 20 | EXPORT_SYMBOL(__ctzsi2); | |
| 21 | ||
| 22 | int __weak __clzsi2(int val) | |
| 23 | { | |
| 24 | return 32 - fls(val); | |
| 25 | } | |
| 26 | EXPORT_SYMBOL(__clzsi2); | |
| 27 | ||
| 28 | #if BITS_PER_LONG == 32 | |
| 29 | ||
| 30 | int __weak __clzdi2(long val) | |
| 31 | { | |
| 32 | return 32 - fls((int)val); | |
| 33 | } | |
| 34 | EXPORT_SYMBOL(__clzdi2); | |
| 35 | ||
| 36 | int __weak __ctzdi2(long val) | |
| 37 | { | |
| 38 | return __ffs((u32)val); | |
| 39 | } | |
| 40 | EXPORT_SYMBOL(__ctzdi2); | |
| 41 | ||
| 42 | #elif BITS_PER_LONG == 64 | |
| 43 | ||
| 44 | int __weak __clzdi2(long val) | |
| 45 | { | |
| 46 | return 64 - fls64((u64)val); | |
| 47 | } | |
| 48 | EXPORT_SYMBOL(__clzdi2); | |
| 49 | ||
| 50 | int __weak __ctzdi2(long val) | |
| 51 | { | |
| 52 | return __ffs64((u64)val); | |
| 53 | } | |
| 54 | EXPORT_SYMBOL(__ctzdi2); | |
| 55 | ||
| 56 | #else | |
| 57 | #error BITS_PER_LONG not 32 or 64 | |
| 58 | #endif |