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https://github.com/torvalds/linux
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Tip revision: 3d70f8c617a436c7146ecb81df2265b4626dfe89 authored by Linus Torvalds on 04 November 2012, 19:07:39 UTC
Linux 3.7-rc4
Tip revision: 3d70f8c
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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