Software > Applications and Porting
[DEV] JIT support for Firefox
tle:
Firstly, all credits go to @ClassicHasClass for his great JIT support work for the v86 Firefox (basically baseline JIT is fully working). He had submitted the patches against upstream at https://bugzilla.mozilla.org/show_bug.cgi?id=1860412 but unfortunately the patch has become stale and no longer work with post-140ESR codebase.
So after spending 3 weeks with help from few people in the PPC community and help of AI agents to track down errors pattern (lacking of tooling like rr-debugger made the work super hard - at one stage I was resolving to all sort of blind hypothesis and nearly gave up), I have successfully revived and fixed number of bugs of the original JIT codes. Please check out https://github.com/runlevel5/firefox/pull/1 to all members here for reviewing.
TL;DR; LE and BE path for POWER8, POWER9 and POWER10 is fully implemented (including ION JIT, WASM SIMD, JSPI and Simulator). Please give JIT work a go and let me know if you happen to find any bug. I have tried my best to hand test and ran many stress test / benchmarks and have addressed quite a number of edge cases.
So what's next? Trying to get it polished as much as possible then get it upstreamed (for release 153 - why? new ESR would be branched off this version) or simply try to get the patch accepted in downstream sources like Fedora, Debian/Ubuntu.
Hasturtium:
Thank you so, SO much. I've really not enjoyed using Chromium as a full-featured web browser in Fedora, and this will make a wonderful difference to my quality of life.
ClassicHasClass:
Good work picking it up. Unfortunately I'm having trouble with Fedora on my Blackbird (won't DHCP through my wifi bridge), so I can't really check it right now, but I've been following the commits as they land.
carlosgonz:
Hi tle
Can you share yours Power FireFox LE build to test?
Thank you for tackle Firefox for power user.
sent from ppc64be,debian-forky and netsurf browser. super kudos to rcs for unJS forum.
tle:
@carlosgonz I mean yes I could package the LE binary (built on Fedora 44). Btw I have not tested against Debian so unsure if the package would work or not (in theory it should)
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