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in reply to @onfiv's post:

A delightful quirk of x86 machines is that rep stosb or rep movsb, which were reasonably fast around the era of the Pentium Pro, but became less so when powerful SIMD became available, is now almost the fastest thing again: new hardware uses an "enhanced rep movsb and stosb operation" feature, so for smaller-than-gargantuan moves it can be best to just let the microcode figure it out.