| 1 | // SPDX-License-Identifier: GPL-2.0-only |
|---|---|
| 2 | /* |
| 3 | * lib/clz_ctz.c |
| 4 | * |
| 5 | * Copyright (C) 2013 Chanho Min <chanho.min@lge.com> |
| 6 | * |
| 7 | * The functions in this file aren't called directly, but are required by |
| 8 | * GCC builtins such as __builtin_ctz, and therefore they can't be removed |
| 9 | * despite appearing unreferenced in kernel source. |
| 10 | * |
| 11 | * __c[lt]z[sd]i2 can be overridden by linking arch-specific versions. |
| 12 | */ |
| 13 | |
| 14 | #include <linux/export.h> |
| 15 | #include <linux/kernel.h> |
| 16 | |
| 17 | int __weak __ctzsi2(int val); |
| 18 | int __weak __ctzsi2(int val) |
| 19 | { |
| 20 | return __ffs(val); |
| 21 | } |
| 22 | EXPORT_SYMBOL(__ctzsi2); |
| 23 | |
| 24 | int __weak __clzsi2(int val); |
| 25 | int __weak __clzsi2(int val) |
| 26 | { |
| 27 | return 32 - fls(x: val); |
| 28 | } |
| 29 | EXPORT_SYMBOL(__clzsi2); |
| 30 | |
| 31 | int __weak __clzdi2(u64 val); |
| 32 | int __weak __clzdi2(u64 val) |
| 33 | { |
| 34 | return 64 - fls64(x: val); |
| 35 | } |
| 36 | EXPORT_SYMBOL(__clzdi2); |
| 37 | |
| 38 | int __weak __ctzdi2(u64 val); |
| 39 | int __weak __ctzdi2(u64 val) |
| 40 | { |
| 41 | return __ffs64(word: val); |
| 42 | } |
| 43 | EXPORT_SYMBOL(__ctzdi2); |
| 44 |