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 |