cregit-Linux how code gets into the kernel

Release 4.14 tools/lib/hweight.c

Directory: tools/lib
// 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 }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo139100.00%1100.00%
Total139100.00%1100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo71100.00%1100.00%
Total71100.00%1100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo57100.00%1100.00%
Total57100.00%1100.00%


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 }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo182100.00%1100.00%
Total182100.00%1100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo45699.78%150.00%
Greg Kroah-Hartman10.22%150.00%
Total457100.00%2100.00%
Directory: tools/lib
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