The only vectorization I'm aware of in C# is the few classes in System.Numerics that are provided specifically for this optimization. In theory, the C# compile

The only vectorization I'm aware of in C# is the few classes in System.Numerics that are provided specifically for this optimization. In theory, the C# compiler and/or JIT could automatically issue SIMD ops for some array operations, if it could determine that order of operations doesn't matter (as could just about any other language), but I think as a general rule this is too expensive at compile time or runtime to be worth it, and most languages force you to make it explicit. Except a couple languages like FORTRAN and apparently APL. (Though I'd love to be shown wrong in the C# case).