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Yeah, the alternative is to do movabs and then test, which is doable but I’m not sure if it’s worth it (surely BT + risk of flags merging penalty has to be better than two ops, one of which is ~9-10 bytes). Fiona > On Jan 22, 2015, at 2:59 PM, Chris Sears <chris.sears at gmail.com> wrote: > > My bad on that. So that's what the comment meant. > That means BT is pretty much