Hi Joel, thanks for posting this.  Although I have only a cursory familiarity with fast multiplication algorithms, I'd like to try and give it a review.  To start with, can you help me understand the choice of this algorithm versus others like Toom?  If this looks correct on a closer view I'll propose it for inclusion. Along the way though I'd like to have it explicitly called out whether this is superior in general to other choices, better for more realistic use cases, simpler, clearer to license or something similar.  It would be nice for future dicussions to have some context around whether it would make sense to have conditions to choose other algorithms as well, or if this one is generally the best for what Postgres users are usually doing.

Continuing with code review in any case.  Interested to hear more.

Regards,

Aaron Altman



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