this post was submitted on 21 Feb 2024
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While it got popularised as "Carmack's reverse" the algorithm is actually significantly older.
Also you'd have to show that it was literally copy+pasted, including comments and all, to even have a chance at a copyright claim: Algorithms are not subject to copyright, similar to how story structures aren't. This is like saying "I asked an author to write a book and they plagiarised the hero's arc!". And even if it was copied straight-out you'd have an uphill battle to fight, to wit, wikipedia is quoting the thing verbatim.
That said copilot seems to be severely over-fitted in places, and I don't like the thing one single bit, and the only thing it's generally good at is writing code faster that shouldn't have been written in the first place, but inverse sqrt isn't a good example.
It didn't just get the gist if the algorithm though, it literally had the same magic number (which isn't even the most optimal iirc), the same COMMENTS (//what the fuck?), same variable names, etc.
It didn't produce the algorithm logically, it copied it.
Wikipedia is also adhering to the GPL license of the code. Copilot is not, especially if it's working on proprietary code or adding an MIT license header to copied GPL code (lol)
I had bing chat spit back at me the question I posted on stack overflow the day before. You know, the example code I provided which didn't exactly work as I wanted.
The magic number is part of the logic of the thing.
But yes as said copilot is overfitted. Inverse sqrt still isn't a good example, it's nearly as bad as Oracle trying to claim to have found copyright infringement in Android's standard Java library by saying that Math.average or whatnot is identical. There are way better examples of why copilot is fucked up.
The magic number is part of the logic, yes, but that's not even the best magic number for the job iirc, and nobody remembers how they got it.
I just used this as an example because it's incredibly clear that it was copied verbatim (again, comments like "what the fuck?" showing up, you can't tell me it came up with that itself)