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https://github.com/torvalds/linux
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Tip revision: 2bd6bf03f4c1c59381d62c61d03f6cc3fe71f66e authored by Linus Torvalds on 16 September 2017, 22:47:51 UTC
Linux 4.14-rc1
Tip revision: 2bd6bf0
builtin-fls.h
#ifndef _ASM_GENERIC_BITOPS_BUILTIN_FLS_H_
#define _ASM_GENERIC_BITOPS_BUILTIN_FLS_H_

/**
 * fls - find last (most-significant) bit set
 * @x: the word to search
 *
 * This is defined the same way as ffs.
 * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
 */
static __always_inline int fls(int x)
{
	return x ? sizeof(x) * 8 - __builtin_clz(x) : 0;
}

#endif
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