On Thu, Aug 2, 2012 at 10:46 AM, David Robillard <d@drobilla.net> wrote:

Is there a reason Jack can't do this for everything?  I am not really
keen on putting a bunch of mysterious assembler crap in a host meant to
be a relatively clean example, and it's even worse to make plugins have
to do this...

JACK doesn't get a chance to handle the output of a plugin until the host hands it over to JACK and the process cycle ends. Just have a reverb plugin outputting denormals and then have the host apply a gain value and boom .. JACK can't play a role in that signal flow. 
 
What is the scope of the state of the flush-to-zero flag?  Process?
Thread?

process, i believe.