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SubjectRe: ABI change for device drivers using future AVX instruction set
Arjan van de Ven wrote:
>
> Let me repeat this loud and clear:
>
> It is not allowed to use floating point, SSE of AVX in device drivers.
>
> (there are few places that very carefully do this anyway, the raid5
> code being the most obvious one, but we should not add more)
>

Sadly, AVX repeats the mistakes of SSE1, and doesn't implement proper
wide support for integer operations. It has the basic bitwide stuff,
which makes it usable for RAID-5, but it doesn't extend MMX (which SSE2
eventually got around to), so it's not usable for RAID-6. I'd hoped to
find a VPERM-style instruction, like SSE5 has :(

-hpa


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