Contributed 3rd Party Builds • Re: Pale Moon for Slackware Linux

The way I handled the Dav1d was to use the new configure option "--enable-libaom" by default only on SSE2 builds. I added an environment variable to allow the user to override the defaults, enabling use of Dav1d on SSE2 or AOM on AVX, if so desired.

Based on the release notes, this seemed like a safe/sane way to approach it, but I'm open to suggestions.

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.