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// SPDX-License-Identifier: GPL-2.0
#include <linux/bitops.h>
#include <asm/types.h>
/**
* hweightN - returns the hamming weight of a N-bit word
* @x: the word to weigh
*
* The Hamming Weight of a number is the total number of bits set in it.
*/
unsigned int __sw_hweight32(unsigned int w)
{
#ifdef CONFIG_ARCH_HAS_FAST_MULTIPLIER
w -= (w >> 1) & 0x55555555;
w = (w & 0x33333333) + ((w >> 2) & 0x33333333);
w = (w + (w >> 4)) & 0x0f0f0f0f;
return (w * 0x01010101) >> 24;
#else
unsigned int res = w - ((w >> 1) & 0x55555555);
res = (res & 0x33333333) + ((res >> 2) & 0x33333333);
res = (res + (res >> 4)) & 0x0F0F0F0F;
res = res + (res >> 8);
return (res + (res >> 16)) & 0x000000FF;
#endif
}
unsigned int __sw_hweight16(unsigned int w)
{
unsigned int res = w - ((w >> 1) & 0x5555);
res = (res & 0x3333) + ((res >> 2) & 0x3333);
res = (res + (res >> 4)) & 0x0F0F;
return (res + (res >> 8)) & 0x00FF;
}
unsigned int __sw_hweight8(unsigned int w)
{
unsigned int res = w - ((w >> 1) & 0x55);
res = (res & 0x33) + ((res >> 2) & 0x33);
return (res + (res >> 4)) & 0x0F;
}
unsigned long __sw_hweight64(__u64 w)
{
#if BITS_PER_LONG == 32
return __sw_hweight32((unsigned int)(w >> 32)) +
__sw_hweight32((unsigned int)w);
#elif BITS_PER_LONG == 64
#ifdef CONFIG_ARCH_HAS_FAST_MULTIPLIER
w -= (w >> 1) & 0x5555555555555555ul;
w = (w & 0x3333333333333333ul) + ((w >> 2) & 0x3333333333333333ul);
w = (w + (w >> 4)) & 0x0f0f0f0f0f0f0f0ful;
return (w * 0x0101010101010101ul) >> 56;
#else
__u64 res = w - ((w >> 1) & 0x5555555555555555ul);
res = (res & 0x3333333333333333ul) + ((res >> 2) & 0x3333333333333333ul);
res = (res + (res >> 4)) & 0x0F0F0F0F0F0F0F0Ful;
res = res + (res >> 8);
res = res + (res >> 16);
return (res + (res >> 32)) & 0x00000000000000FFul;
#endif
#endif
}
| Name | Type | Size | Permission | Actions |
|---|---|---|---|---|
| api | Folder | 0755 |
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| bpf | Folder | 0755 |
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| lockdep | Folder | 0755 |
|
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| perf | Folder | 0755 |
|
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| subcmd | Folder | 0755 |
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| symbol | Folder | 0755 |
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| argv_split.c | File | 1.68 KB | 0644 |
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| bitmap.c | File | 2.88 KB | 0644 |
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| ctype.c | File | 1.34 KB | 0644 |
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| find_bit.c | File | 2.98 KB | 0644 |
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| hweight.c | File | 1.77 KB | 0644 |
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| list_sort.c | File | 7.82 KB | 0644 |
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| rbtree.c | File | 16.09 KB | 0644 |
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| slab.c | File | 664 B | 0644 |
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| str_error_r.c | File | 1.01 KB | 0644 |
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| string.c | File | 4.65 KB | 0644 |
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| vsprintf.c | File | 900 B | 0644 |
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| zalloc.c | File | 197 B | 0644 |
|