> But you usually can't achieve vectorization by just simply changing your data layout, the compiler's auto-vectorization features usually doesn't work that wel

> But you usually can't achieve vectorization by just simply changing your data layout, the compiler's auto-vectorization features usually doesn't work that well. Please don't build a straw man. You (or the compiler) can't achieve vectorization if you have the wrong data layout. Period. How easy / hard is for you or the compiler to vectorize something depends on the application. It can "just work", it might require a one line `pragma simd`, it might require you to use portable `std::simd` types by hands, or use SIMD intrinsics, or write assembly manually. But none of these are options if you have the wrong data layout.