My thought as well.<p>As far as I understand, these intrinsics map to SSE instructions (they are 128-bit). One could use the later AVX (256-bit, found in server chips since 2011). Probably they decided to start with the lowest common denomintor of SSE, because they don&#x27;t have AVX in <i>all</i> of their servers? The term <i>SIMD</i> is generic.