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17 lines
412 B
17 lines
412 B
/* 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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