[Ardour-Users] Denormals

Q lists at quirq.ukfsn.org
Wed Jan 4 11:58:56 PST 2012

On 04/01/12 19:35, Carl Hetherington wrote:
> I *believe* (but am happy to be proved wrong) that DAZ should work fine
> in 32-bit mode, but that the plugin code *must* be compiled with -msse
> -mfpmath=sse. If it is not, the DAZ stuff doesn't work (since the plugin
> is generating denormals using non-SSE instructions) and so denormal
> behaviour will be very bad.
> A very limited straw poll of both plugins and CPUs suggests that most
> plugins use -ffast-math, which seems to make no improvement to poor
> denormal processing on CPUs running in 32-bit mode (though it seems to
> always help in 64-bit).
> I was hoping that we could compile the OP's plugins with -msse
> -mfpmath=sse to SSEe (boom boom) if that helped.
> If scons isn't recognising the CPU properly, and so not offering to turn
> on FTZ/DAZ, that is another fly in the ointment, but not the only one
> here, I think.
> Carl

I was thinking of probably heading over to IRC on Friday evening, or 
maybe over the weekend -- either way, when I have a bit more time and 
mental energy to devote than on a "school night" ;-)

Thanks again for everyone's help with this.


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