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Doesn't x86-64v4 require it?

This throws upside down the whole x86-64 levels concept. What a mess.



According to this article [0], x86_64 level 4 is AVX-512 itself. So no, you lose a level completely. Nothing gets borked, and you get level 3 hardware.

[0]: https://www.phoronix.com/scan.php?page=news_item&px=GCC-11-x...




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