Release 4.15 include/asm-generic/bitops/fls64.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_GENERIC_BITOPS_FLS64_H_

#define _ASM_GENERIC_BITOPS_FLS64_H_

#include <asm/types.h>

/**
 * fls64 - find last set bit in a 64-bit word
 * @x: the word to search
 *
 * This is defined in a similar way as the libc and compiler builtin
 * ffsll, but returns the position of the most significant set bit.
 *
 * fls64(value) returns 0 if value is 0 or the position of the last
 * set bit if value is nonzero. The last (most significant) bit is
 * at position 64.
 */
#if BITS_PER_LONG == 32


static __always_inline int fls64(__u64 x)
{
	__u32 h = x >> 32;
	if (h)
		return fls(h) + 32;
	return fls(x);
}
Contributors
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CommitProp
Akinobu Mita
34
97.14%
1
50.00%
Andi Kleen
1
2.86%
1
50.00%
Total
35
100.00%
2
100.00%

#elif BITS_PER_LONG == 64


static __always_inline int fls64(__u64 x)
{
	if (x == 0)
		return 0;
	return __fls(x) + 1;
}
Contributors
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CommitProp
Alexander van Heukelum
26
96.30%
1
50.00%
Andi Kleen
1
3.70%
1
50.00%
Total
27
100.00%
2
100.00%

#else
#error BITS_PER_LONG not 32 or 64
#endif

#endif /* _ASM_GENERIC_BITOPS_FLS64_H_ */
Overall Contributors
Person
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CommitProp
Akinobu Mita
46
49.46%
2
40.00%
Alexander van Heukelum
44
47.31%
1
20.00%
Andi Kleen
2
2.15%
1
20.00%
Greg Kroah-Hartman
1
1.08%
1
20.00%
Total
93
100.00%
5
100.00%
Directory: include/asm-generic/bitops

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