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For example, take this loop in a dot product function which we had to write in Assembly because what the Go compiler produced wasn't fast enough. The reason it's in assembly is because we can use AVX FMA instructions, but notice how the loop is unrolled 4 times. This unrolling actually brought about as much performance gain as the AVX instructions itself. From what I understand the compiler also does unrolling on regular Go for loops. So, if the additional functional call would prevent the unrolling, this could be a quite noticeable performance penalty.
I still believe that Go is better served by a handful of new builtins, plus ergonomics lambdas, than full-blown user-defined generics. In particular, adding map/filter as builtins would allow for deep compiler optimization. In Ply I was able to transform chains like xs.morph(square).filter(even) into a single for loop with no intermediate slice allocations.
From https://github.com/robpike/filter:
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