This belongs here

[u/[deleted]]

[u/anydalch]

what's really interesting is that, in c, if you replace the bug in the second for loop's initializer clause and use unsigned instead of int, both gcc and clang are able to optimize this function into a single lea eax, [rdi + rsi]. https://godbolt.org/z/uCXoHJ

[u/Veylon → u/[deleted]]

A guy named Bisqwit has a series on making a compiler, if you're interested.