FFT in D (using SIMD) and benchmarks

[a]

On Wednesday, 25 January 2012 at 00:49:15 UTC, bearophile wrote:
> a:
>
>> Because dmd currently doesn't have an intrinsic for the SHUFPS 
>> instruction I've included a version block with some GDC 
>> specific code (this gave me a speedup of up to 80%).
>
> It seems an instruction worth having in dmd too.
>
>
>> Chart: http://cloud.github.com/downloads/jerro/pfft/image.png
>
> I know your code is relatively simple, so it's not meant to be 
> the fastest on the ground, but in your nice graph _as reference 
> point_ I'd like to see a line for the FTTW too. Such line is 
> able to show us how close or how far all this is from an 
> industry standard performance.
> (And if possible I'd like to see two lines for the LDC2 
> compiler too.)
>
> Bye,
> bearophile

I have updated the graph now.