[linux-audio-dev] Re: Fixing Freeverb and Denormals

[Steve Harris]

On Sat, Jan 22, 2005 at 03:17:28PM +0100, Christian Schoenebeck wrote:
> I think for such an important piece like freeverb it might be worth to add 
> architecture dependant assembly optimizations. E.g. with SSE(1) you simply 
> have to change the SSE control register to get rid of the denormal problem. 
> With that no denormal fixes for individual sample points are necessary 
> anymore which definitely pays off in performance.

Agreed, but I'm not sure how doing that will affect the host - ie does
-mfpumath=SSE (or whatever the option is) always leave the FPU stack in a
sane state when control goes back to the host? I dont think it would
normally return the FPU to 387 mode, which might do bad things to the
host occasionally.

OTOH it might be fine, I dont understand the interaction with the 387 and
SSE.

- Steve