26/10/2021 17:56, Aman Kumar:

This patch provides a rte_memcpy* call with temporal stores.
Use -Dcpu_instruction_set=znverX with build to enable this API.

Signed-off-by: Aman Kumar <redacted>
---
 config/x86/meson.build           |   2 +
 lib/eal/x86/include/rte_memcpy.h | 114 +++++++++++++++++++++++++++++++

It looks better as C code.
Do you achieve the same performance as the asm version?

+#if defined RTE_MEMCPY_AMDEPYC

[...]

+static __rte_always_inline void *
+rte_memcpy_aligned_tstore16_generic(void *dst, void *src, int len)

So to be clear, an application will benefit of this optimization if
1/ DPDK is specifically compiled for AMD
2/ the application is compiled with above DPDK build (because of inlinining)

I guess there is no good way to benefit from the optimization
without specific compilation, because of inlining constraint.
Another design, with less constraint but less performance,
would be to have a function pointer assigned at runtime based on the CPU.