IIRC it's very CPU dependent. I remember running into a similar issue with memcpy vs. memmove where the latter was actually faster on some CPUs because it used

IIRC it's very CPU dependent. I remember running into a similar issue with memcpy vs. memmove where the latter was actually faster on some CPUs because it used stosb instead of AVX/SSE and some intel CPUs could make that really go fast. TL;DR: benchmark for your specific hardware if it really matters.