It really depends based on how shasum is implemented. If its implemented in assembly, it'll perform the same no matter how its compiled. But if its written usin

It really depends based on how shasum is implemented. If its implemented in assembly, it'll perform the same no matter how its compiled. But if its written using C code, the compiler has a lot of latitude to vectorize based on target CPU features. And not just SSE2 and AVX. Even popcnt isn't even available in the baseline x86_64 target for llvm. The Fil-C compiler is a fork of llvm. There's no way all that garbage collection code would make fil-c faster. So if its faster, its probably using different target flags. And in that case, its not a fair benchmark comparison.