K 10
svn:author
V 3
kib
K 8
svn:date
V 27
2015-03-31T01:44:07.858807Z
K 7
svn:log
V 376
Provide workaround for a performance issue with the popcnt instruction
on Intel processors.  Clear spurious dependency by explicitely xoring
the destination register of popcnt.

Use bitcount64() instead of re-implementing SWAR locally, for
processors without popcnt instruction.

Reviewed by:	jhb
Discussed with:	jilles (previous version)
Sponsored by:	The FreeBSD Foundation

END