[Webkit-unassigned] [Bug 187889] Hard dependency on SSE2 instruction set

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Mon Jul 23 12:51:48 PDT 2018


https://bugs.webkit.org/show_bug.cgi?id=187889

--- Comment #11 from karogyoker2+webkit at gmail.com ---
(In reply to karogyoker2+webkit from comment #10)
> > This way Pentium 4 users will be saved: !OS(WINDOWS) && CPU(X86_SSE2)
> 
> Sorry, this was bad, obviously it should be !OS(WINDOWS) && (CPU(X86_SSE2)
> || CPU(X86_64))

Ah, I it seems X86_SSE2 is not everywhere available and it covers X86_64 too, anyways, if it is just __SSE2__ it is OK too, but I think you know it better, I'm not familiar with the codebase. By the way, I checked the SVN and it seems this bug got introduced in 2.19.90 (released on February 5), must be part of the Spectre V2 mitigation. By the way, I think this is why I can't boot Windows 7 anymore on my Athlon XP machine since 2018 February patch rollup. I think MS used hardcoded LFENCE too in that cumulative patch. So I switched to Linux but there isn't any web browser which can run without SSE2, only Firefox ESR 52 which will be end of life in August.

Quote from Michael Catanzaro:
"For WebKitGTK+, SSE2 instructions are forbidden (except when building for x86_64) because that's what our distributors require. But I doubt all developers are aware of this, and I also doubt anybody ever tests on such old hardware. So it might require some effort to audit the codebase for unwanted SSE2 instructions to make sure they're not there and fix them if so."

So this is obviously a bug.

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