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von | Dez 3, 2019 | Allgemein | 0 Kommentare

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Cokiee Shell Web

Cokiee Shell

Current Path : /proc/self/root/lib/modules/3.2.0-4-amd64/source/include/asm-generic/bitops/
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Current File : //proc/self/root/lib/modules/3.2.0-4-amd64/source/include/asm-generic/bitops/fls.h

#ifndef _ASM_GENERIC_BITOPS_FLS_H_
#define _ASM_GENERIC_BITOPS_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)
{
	int r = 32;

	if (!x)
		return 0;
	if (!(x & 0xffff0000u)) {
		x <<= 16;
		r -= 16;
	}
	if (!(x & 0xff000000u)) {
		x <<= 8;
		r -= 8;
	}
	if (!(x & 0xf0000000u)) {
		x <<= 4;
		r -= 4;
	}
	if (!(x & 0xc0000000u)) {
		x <<= 2;
		r -= 2;
	}
	if (!(x & 0x80000000u)) {
		x <<= 1;
		r -= 1;
	}
	return r;
}

#endif /* _ASM_GENERIC_BITOPS_FLS_H_ */

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