Support AVX
 

Support the next version of Prime95 AVX? If yes, is already known when this version is available?

Yes to AVX. No as to a known date.

At present, FFT sizes 32, 128, 512, and 2048 are coded and mostly working.

[QUOTE=Prime95;265389]Yes to AVX. No as to a known date.

At present, FFT sizes 32, 128, 512, and 2048 are coded and mostly working.[/QUOTE]
Any hints as to speed increase on these FFTs?

Just got numbers for the 2K FFT:

SSE2: 100 iters in 1.110 ms
AVX: 100 iters in 0.682 ms

I'm not sure if these numbers will extrapolate to large FFTs. These small FFTs operate completely in the L1 cache.

[QUOTE=Prime95;265412]Just got numbers for the 2K FFT:

SSE2: 100 iters in 1.110 ms
AVX: 100 iters in 0.682 ms

I'm not sure if these numbers will extrapolate to large FFTs. These small FFTs operate completely in the L1 cache.[/QUOTE]
Nice. I use the smaller FFTs most of the time in LLR anyway so I am not too worried.:smile:

[QUOTE=Prime95;265412]Just got numbers for the 2K FFT:

SSE2: 100 iters in 1.110 ms
AVX: 100 iters in 0.682 ms[/QUOTE]

These timings seem consistent with the fact that AVX is not twice as fast as SSE2 despite the increase to 256 bits. Hopefully AVX2 and the new Tri-Gate chips will "fix" this.