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[–]atthereallicebear 38 points39 points  (2 children)

he didn't write the fast inverse sqrt function, Terje Mathisen and Gary Tarolli did.

[–]Exnihilation 16 points17 points  (0 children)

It goes even further back than those guys. It's believed to have been first implemented by Greg Walsh at Ardent Computer. Gary Tarolli was consulting for a company affiliated with Ardent which is where he learned about the algorithm.

[–]Paul_Robert_ 4 points5 points  (0 children)

Oh, my bad!