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

[bugzilla-daemon at webkit.org]

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

--- Comment #8 from karogyoker2+webkit at gmail.com ---
(In reply to karogyoker2+webkit from comment #7)
> In wtf\Atomics.h I found this:
> inline void x86_lfence()
> {
> #if !OS(WINDOWS)
>     asm volatile("lfence" ::: "memory");
> #endif
> }
> 
> Well, this won't work on every x86, it should be !OS(WINDOWS) && CPU(X86_64)
> because every 64bit CPU has SSE2. Pentium 4 users would lose Spectre V2
> mitigation here.

This way Pentium 4 users will be saved: !OS(WINDOWS) && CPU(X86_SSE2)

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