Staging
v0.5.1
https://github.com/torvalds/linux
Raw File
Tip revision: d1db0eea852497762cab43b905b879dfcd3b8987 authored by Linus Torvalds on 28 April 2014, 02:29:27 UTC
Linux 3.15-rc3
Tip revision: d1db0ee
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
back to top