1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_GENERIC_BITOPS___FLS_H_
3 #define _ASM_GENERIC_BITOPS___FLS_H_
8 * __fls - find last (most-significant) set bit in a long word
9 * @word: the word to search
11 * Undefined if no set bit exists, so code should check against 0 first.
13 static __always_inline unsigned long __fls(unsigned long word)
15 int num = BITS_PER_LONG - 1;
17 #if BITS_PER_LONG == 64
18 if (!(word & (~0ul << 32))) {
23 if (!(word & (~0ul << (BITS_PER_LONG-16)))) {
27 if (!(word & (~0ul << (BITS_PER_LONG-8)))) {
31 if (!(word & (~0ul << (BITS_PER_LONG-4)))) {
35 if (!(word & (~0ul << (BITS_PER_LONG-2)))) {
39 if (!(word & (~0ul << (BITS_PER_LONG-1))))
44 #endif /* _ASM_GENERIC_BITOPS___FLS_H_ */