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  "publishedAt": "2026-06-04T23:47:33.000Z",
  "site": "http://forum.palemoon.org",
  "textContent": "> Well, the issue is kind of that Dav1d doesn't actually work on SSE2-only CPUs, at least not if it's compiled on a machine that has AVX instructions available. The issue seems to be that **it emits AVX instructions on any compiler/machine combo that can, regardless of what you want**. Hypothetically, it might work if you compile it on a machine with a CPU that can't support AVX, because that would force the compiler to generate fallback instructions or something, but I have no idea.\n\nThis is interesting! In that case, I may just have to give it a go myself. I.e., I'll try compiling with my defaults reversed, and use an AVX-capable box for the SSE2 build. We'll see what happens...\n\nIf what you suspect is true, then I should get an \"Illegal instruction\" error when trying to watch an AV1 video with the resulting PM-sse2 binary.\n\nFor the record, this is all just academic for me personally, as I don't watch videos online anyway. Still, I'd like to have all my ducks in a row...\n\n* * *",
  "title": "Contributed 3rd Party Builds • Re: Pale Moon for Slackware Linux",
  "updatedAt": "2026-06-04T23:47:33.000Z"
}