diff options
Diffstat (limited to 'tools/perf/util/hweight.c')
| -rw-r--r-- | tools/perf/util/hweight.c | 31 | 
1 files changed, 0 insertions, 31 deletions
| diff --git a/tools/perf/util/hweight.c b/tools/perf/util/hweight.c deleted file mode 100644 index 5c1d0d099f0d..000000000000 --- a/tools/perf/util/hweight.c +++ /dev/null @@ -1,31 +0,0 @@ -#include <linux/bitops.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 hweight32(unsigned int w) -{ -	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; -} - -unsigned long hweight64(__u64 w) -{ -#if BITS_PER_LONG == 32 -	return hweight32((unsigned int)(w >> 32)) + hweight32((unsigned int)w); -#elif BITS_PER_LONG == 64 -	__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 -} | 
