GCC 10 Compiler Picks Up New Scheduler Model & Cost Tables For AMD Zen 2 Processors

[phoronix]

Phoronix: GCC 10 Compiler Picks Up New Scheduler Model & Cost Tables For AMD Zen 2 Processors

While AMD developers published their "Znver2" compiler patches for Zen 2 originally back in November, months ahead of the recent Ryzen 3000 series launch, this compiler support was incomplete as it re-used the existing scheduler model and costs table of Znver1. Now though one of SUSE's compiler experts who often works in cooperation with AMD has published the new Znver2 scheduler model and costs table for Zen 2...

http://www.phoronix.com/scan.php?page=news_item&px=GCC-10-Zen2-Scheduler-Model

[mcloud]

I wonder if it really just a cost table it couldn't be back-ported to more general available versions

[ldesnogu]

I wonder if it really just a cost table it couldn't be back-ported to more general available versions

Quickly looking at the patch, it should apply cleanly to the 9.x branch.

[hubicka]

Quickly looking at the patch, it should apply cleanly to the 9.x branch.

We plan to backport this to gcc 9 after some testing. Initial znver2 tuning was already pretty complete, so do not expect miracles
Main win is the perofmrance of matrix multiplication with -O3.