On Wed, May 11, 2016 at 07:15:19AM -0400, Brian Gerst wrote: > I think he meant the out of line version would be asm, so you could > control what registers were clobbered.
Yeah, it might save a few cycles on the call, but given that most machines should have popcnt these days is it worth the hassle/cost of duplicating the lib/hweight.c magic in asm (and remember, twice, once for 32bit and once for 64bit) ?
