diff options
| author | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2013-07-27 22:07:53 +0000 |
|---|---|---|
| committer | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2013-07-27 22:07:53 +0000 |
| commit | 4fbe7358c7747a9165f776eb19addbb9baf7def2 (patch) | |
| tree | bc7076b4f6d10c2cc2942539bb666e50f0b66954 /libdde_linux26/contrib/lib/hweight.c | |
| parent | 21adb5284111190057db245cfc2b54091920c373 (diff) | |
rename libdde_linux26 into libdde-linux26 to make dpkg-source happy
Diffstat (limited to 'libdde_linux26/contrib/lib/hweight.c')
| -rw-r--r-- | libdde_linux26/contrib/lib/hweight.c | 59 |
1 files changed, 0 insertions, 59 deletions
diff --git a/libdde_linux26/contrib/lib/hweight.c b/libdde_linux26/contrib/lib/hweight.c deleted file mode 100644 index 389424ec..00000000 --- a/libdde_linux26/contrib/lib/hweight.c +++ /dev/null @@ -1,59 +0,0 @@ -#include <linux/module.h> -#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 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; -} -EXPORT_SYMBOL(hweight32); - -unsigned int 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; -} -EXPORT_SYMBOL(hweight16); - -unsigned int hweight8(unsigned int w) -{ - unsigned int res = w - ((w >> 1) & 0x55); - res = (res & 0x33) + ((res >> 2) & 0x33); - return (res + (res >> 4)) & 0x0F; -} -EXPORT_SYMBOL(hweight8); - -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 -#ifdef 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 -} -EXPORT_SYMBOL(hweight64); |
