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42 lines
683 B
42 lines
683 B
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ASM_GENERIC_BITOPS_FLS_H_ |
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#define _ASM_GENERIC_BITOPS_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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int r = 32; |
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if (!x) |
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return 0; |
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if (!(x & 0xffff0000u)) { |
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x <<= 16; |
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r -= 16; |
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} |
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if (!(x & 0xff000000u)) { |
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x <<= 8; |
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r -= 8; |
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} |
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if (!(x & 0xf0000000u)) { |
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x <<= 4; |
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r -= 4; |
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} |
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if (!(x & 0xc0000000u)) { |
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x <<= 2; |
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r -= 2; |
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} |
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if (!(x & 0x80000000u)) { |
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x <<= 1; |
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r -= 1; |
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} |
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return r; |
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} |
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#endif /* _ASM_GENERIC_BITOPS_FLS_H_ */
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