linux/lib/clz_ctz.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * lib/clz_ctz.c
 *
 * Copyright (C) 2013 Chanho Min <[email protected]>
 *
 * The functions in this file aren't called directly, but are required by
 * GCC builtins such as __builtin_ctz, and therefore they can't be removed
 * despite appearing unreferenced in kernel source.
 *
 * __c[lt]z[sd]i2 can be overridden by linking arch-specific versions.
 */

#include <linux/export.h>
#include <linux/kernel.h>

int __weak __ctzsi2(int val);
int __weak __ctzsi2(int val)
{ … }
EXPORT_SYMBOL(…);

int __weak __clzsi2(int val);
int __weak __clzsi2(int val)
{ … }
EXPORT_SYMBOL(…);

int __weak __clzdi2(u64 val);
int __weak __clzdi2(u64 val)
{ … }
EXPORT_SYMBOL(…);

int __weak __ctzdi2(u64 val);
int __weak __ctzdi2(u64 val)
{ … }
EXPORT_SYMBOL(…);