Interesting. I implemented lazy FPU switching on Atari ST 68881 way back, for MiNT and ST-Minix. Back then it was well worthwhile. And also, impossible to inadvertently leak data.
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Oh I see, this is another SPECTRE-like vuln, Intel-only. https://www.phoronix.com/scan.php?page=news_item&px=Lazy-State-Restore-Spec-Exec … and once again, Intel leaves the BSDs in the dark.
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