I guess "easier" is a relative term; welding something together in your garage is never going to be as easy & efficient as buying the Toyota... but what the bin

I guess "easier" is a relative term; welding something together in your garage is never going to be as easy & efficient as buying the Toyota... but what the binding constraints on the field's progress are I don't claim to know. But since you seem to understand the paper a bit, may I ask: I thought convolution was done by FFT, shaving N^2 to NlogN and all that. Are these automated compilers they discuss smart enough to find that, or are they literally re-arranging (1)? Or is it all so memory-bound that this question makes no sense?