@jandem@mastodon.social
Engineer at @mozilla, working on the @SpiderMonkey JavaScript engine.
We found an Apple Silicon CPU issue with FJCVTZS, the "JS-compatible double-to-int32 conversion" instruction that was added to ARMv8.3.
If the Flush-to-Zero flag is set in the FPCR register and FJCVTZS is used with a denormal, my M1 sets the Zero flag to 1 and M2-M4 CPUs set it to 0. This flag indicates whether the conversion was exact. I believe M1 is correct?
Test case: https://gist.github.com/jandem/e6b5660975f145b85d533b97ad054f08
With the Firefox hg => git migration happening on Wednesday, I just want to mention that Jujutsu (jj) is a very good git-compatible alternative to both Mercurial and Git. I've been using it for mozilla-central work since January after 15 years of Mercurial.
There's a growing community of users at Mozilla and it's been great for finding and fixing problems :)
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