Re: [Qemu-devel] [Qemu-ppc] [RFC PATCH 0/6] target/ppc: convert VMX instructions to use TCG vector operations

[BALATON Zoltan]

On Mon, 10 Dec 2018, Richard Henderson wrote:
> On 12/10/18 2:54 PM, BALATON Zoltan wrote:
> > Tried it on i5 650 which has: sse sse2 ssse3 sse4_1 sse4_2. I assume x86_64
> > should be supported but not sure what are the CPU requirements.
>
> Not quite.  I only support avx1 and later.
>
> I thought about supporting sse4 and later (that's the minimum with all of the
> instructions that do what we need), but there is only one cpu generation with
> sse4 and without avx1, and avx1 is already 8 years old.

OK that explains why I haven't seen any improvements. My CPU just predates 
AVX and happens to be in the generation you mention. But I agree this 
probably does not worth the effort. Maybe I should test on something newer 
instead.

Thank you,
BALATON Zoltan