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- // 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)
- {
- return __ffs(val);
- }
- EXPORT_SYMBOL(__ctzsi2);
- int __weak __clzsi2(int val);
- int __weak __clzsi2(int val)
- {
- return 32 - fls(val);
- }
- EXPORT_SYMBOL(__clzsi2);
- int __weak __clzdi2(u64 val);
- int __weak __clzdi2(u64 val)
- {
- return 64 - fls64(val);
- }
- EXPORT_SYMBOL(__clzdi2);
- int __weak __ctzdi2(u64 val);
- int __weak __ctzdi2(u64 val)
- {
- return __ffs64(val);
- }
- EXPORT_SYMBOL(__ctzdi2);
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