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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * lib/clz_ctz.c4 *5 * Copyright (C) 2013 Chanho Min <chanho.min@lge.com>6 *7 * The functions in this file aren't called directly, but are required by8 * GCC builtins such as __builtin_ctz, and therefore they can't be removed9 * 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 17int __weak __ctzsi2(int val);18int __weak __ctzsi2(int val)19{20 return __ffs(val);21}22EXPORT_SYMBOL(__ctzsi2);23 24int __weak __clzsi2(int val);25int __weak __clzsi2(int val)26{27 return 32 - fls(val);28}29EXPORT_SYMBOL(__clzsi2);30 31int __weak __clzdi2(u64 val);32int __weak __clzdi2(u64 val)33{34 return 64 - fls64(val);35}36EXPORT_SYMBOL(__clzdi2);37 38int __weak __ctzdi2(u64 val);39int __weak __ctzdi2(u64 val)40{41 return __ffs64(val);42}43EXPORT_SYMBOL(__ctzdi2);44