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![]() Add support for the hardware version of the Hamming weight function, popcnt, present in CPUs which advertize it under CPUID, Function 0x0000_0001_ECX[23]. On CPUs which don't support it, we fallback to the default lib/hweight.c sw versions. A synthetic benchmark comparing popcnt with __sw_hweight64 showed almost a 3x speedup on a F10h machine. Signed-off-by: Borislav Petkov <borislav.petkov@amd.com> LKML-Reference: <20100318112015.GC11152@aftab> Signed-off-by: H. Peter Anvin <hpa@zytor.com> |
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.. | ||
__ffs.h | ||
__fls.h | ||
arch_hweight.h | ||
atomic.h | ||
const_hweight.h | ||
ext2-atomic.h | ||
ext2-non-atomic.h | ||
ffs.h | ||
ffz.h | ||
find.h | ||
fls.h | ||
fls64.h | ||
hweight.h | ||
le.h | ||
lock.h | ||
minix-le.h | ||
minix.h | ||
non-atomic.h | ||
sched.h |