For aligned memcpy and memset REP MOVSD and REP STOSD vs temporal and non-temproray ymm / zmm registers

I have seen a few very informative posts here and here discussing the merits of difference approach for copying / setting memory.

All of the posts go into detail about the pros and cons of REP MOVSD in a variety of settings, though I found where discussing the topic in too generic a setting to actual come to any definitive answers.

So for x86_64 skylake I am curious about the following scenarios:

Assume for all scenarios both src and dst are page aligned

• Copying 16384 bytes of data

  • Comparing REP MOVSD, ymm blocks, zmm blocks

• Copying 2 Gibabytes of data

  • Comparing REP MOVSD, ymm blocks w/ VMOVNTDQ, zmm blocks w/ VMOVNTDQ

• Setting 16384 bytes of data

  • Comparing REP STOSD, ymm blocks, zmm blocks

• Setting 2 Gibabytes of data

  • Comparing REP STOSD, ymm blocks w/ VMOVNTDQ, zmm blocks w/ VMOVNTDQ

Based the glibc imlementation of memcpy and memset

It seems SIMD register for memcpy and REP STOSD for both of the memset cases.

I am curious if there are any hard recommendations for these scenarios (and to understand better why they are recommendations).

Thank you.

Edit: One of the reasons I am making this post is that the other posts didn't seem to discuss AVX512.