AMD Zen 2 Improvements For LLVM Have Been Held Up For Months By Code Review

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Back in February for LLVM Clang 9.0 was the initial AMD Zen 2 "znver2" enablement, but like the GCC support at the time it was the very basics. With time GCC picked up Zen 2 scheduler improvements and other work while sadly in the case of LLVM the improvements are still pending.

 

Back in August, AMD's Ganesh Gopalasubramanian sent out the znver2 scheduler model for LLVM for Zen 2 CPUs but a focus on the EPYC 7002 "Rome" processors. "There are few improvements with respect to execution units, latencies and throughput when compared with znver1. The tests that were present for znver1 for llvm-mca tool were replicated. The latencies, execution units, timeline and throughput information are updated for znver2."

 

Source:https://www.phoronix.com/scan.php?page=news_item&px=AMD-znver2-Scheduler-LLVM-Pend

 

I have to admit, this makes sense. I have been hearing of this new wonderful AGESA with tonnes of fixes across the product line...but still waiting on it.