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A comment on Fast Inverse Square Root. Parent comment

Re:Fast Inverse Square Root by gruez on Monday November 02, 2020 @11:01PM (#24976160)
It was first found in quake 3, which I believed used software rendering. Given that inverse square root is heavily used for lighting functions, and it was all done in CPU, it's reasonable to believe that this provided a non-negligible speedup overall.
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Re:Fast Inverse Square Root by smcl on Tuesday November 03, 2020 @03:25AM (#24977598)
iirc Quake 3 required a 3D accelerator and didn't support software rendering - but this was before graphics cards supported hardware T&L so you're right those lighting calcs would be performed on the CPU
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