Maybe I'm just oldschool but I found that auto-vectorization hardly ever does what one thinks it should do. I view it as a nice tool in my belt but I don't ever

Maybe I'm just oldschool but I found that auto-vectorization hardly ever does what one thinks it should do. I view it as a nice tool in my belt but I don't ever expect it to magically speed things up for me by large factors. If I want real SIMD I get down to intrinsics or assembler myself.