[Webkit-unassigned] [Bug 188145] Hardcoded LFENCE instruction

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=188145

--- Comment #21 from Michael Catanzaro <mcatanzaro at igalia.com> ---
Technically, many of WebKitGTK+'s distributors require that it not use SSE2 instructions in 32-bit builds. I am no longer sure which ones. (It used to be the case for Fedora, for example, but that changed recently.)

In practice, so few people care about these old machines anymore that such use is unlikely to be noticed by many users. Certain software (including Firefox and Chromium) has already started to require SSE2 and is broken on these machines, so the requirement is already not fulfilled by other software. E.g. it is clear that Debian is not patching Firefox or Chromium to remove the SSE2 instructions.

So times change, and I think we can get away with starting to require SSE2, if there is a compelling reason to do so. But according to Filip's review in that bug, we probably don't need to do so right now.

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