[LAD] denormal handling

Paul Davis paul at linuxaudiosystems.com
Sat Sep 29 22:14:04 UTC 2007

On Sun, 2007-09-30 at 08:09 +1000, Erik de Castro Lopo wrote:
> Jens M Andreasen wrote:
> > Although you are approximately right in many parts of this discussion,
> > you are wrong on the cost of the CPU flags to round twards zero. The
> > cost is nil.
> My memory of this is that changing the FPU flags causes a pipeline flush.
> If the happens inside an inner loop, this has a **huge** performance
> penalty.

this would be a truly terrible and stupid design.

which i guess is why there actually are VST plugins that do this on
every process() call.

our use of it in Ardour is host-wide, at program startup, which i
believe is the only sensible way to use FTZ or DAZ.


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