mirror of https://gitee.com/openkylin/linux.git
18 lines
412 B
C
18 lines
412 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_GENERIC_BITOPS_BUILTIN_FLS_H_
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#define _ASM_GENERIC_BITOPS_BUILTIN_FLS_H_
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/**
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* fls - find last (most-significant) bit set
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* @x: the word to search
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*
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* This is defined the same way as ffs.
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* Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
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*/
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static __always_inline int fls(unsigned int x)
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{
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return x ? sizeof(x) * 8 - __builtin_clz(x) : 0;
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}
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#endif
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