Christian Weisgerber <naddy@mips.inka.de> wrote:

> Christian Schulte:
> 
> > lately I thought about rewriting those functions to use simd, but never
> > looked further into doing it, because I do not know if simd
> > registers/instructions could be used there at all. Could they? Instead
> 
> Presumably not in the kernel as we would have to save/restore
> FPU/SIMD registers around those calls.

Yes, this tradeoff is PROBABLY very poor, unless the copy is very large.