It's pretty cheap. You can easily find the latency and throughput numbers on different Intel architectures. Here's an example for movdqa: https://www.intel.com/

It's pretty cheap. You can easily find the latency and throughput numbers on different Intel architectures. Here's an example for movdqa: https://www.intel.com/content/www/us/en/docs/intrinsics-guide/index.html#ig_expand=4029,0,4029&text=_mm_load_si128 https://www.intel.com/content/www/us/en/docs/intrinsics-guid... which is a basic 128-bit load. Even a 512-bit load isn't much more expensive: https://www.intel.com/content/www/us/en/docs/intrinsics-guide/index.html#text=_mm512_load_epi64&ig_expand=4006,3993 https://www.intel.com/content/www/us/en/docs/intrinsics-guid...