[PATCH] [X86_64]: Enable support for next generation AMD Zen4 CPU

[Joshi, Tejas Sanjay]

[Public]

Hi all,

PFA, the patch that enables support for the next generation AMD Zen4 CPU via -march=znver4.
This is a basic enablement patch and as of now the costings, tunings are kept same as znver3.

Good for trunk?

Regards,
Tejas
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