there new version coming
https://www.phoronix.com/scan.php?page=news_item&px=GCC-11-Znver3-Round-3
with better AVX for AMD
https://www.phoronix.com/scan.php?page=news_item&px=GCC11-Znver3-GATHER-Patch-2
also some tests on Epyc with AOCC ( AMD compiler not free )
https://www.phoronix.com/scan.php?page=article&item=amd-aocc30-initial&num=1