[webkit-dev] RFC: dropping support for x87

Xan xan.lopez at gmail.com
Thu Mar 21 10:10:03 PDT 2019

Since there were no negative comments in the list, just another extra
positive comment in the bug itself, we have landed this:


On Mon, Mar 11, 2019 at 7:00 PM Xan <xan.lopez at gmail.com> wrote:

> Hi,
> as part of Igalia's work on 32bit support we spent some time trying to
> iron out some bugs in JSC/intel 32bit builds. A bunch of them were related
> to rounding errors (or more precisely, differences) caused by the extended
> precision FP registers used by default in x87; which, in turn, is the
> default in GCC when compiling with -m32.
> We discussed a number of solutions, but then we noticed that major
> browsers have in recent times already dropped support for x87:
> Firefox:
> https://support.mozilla.org/en-US/kb/your-hardware-no-longer-supported
> Chrome: https://support.google.com/chrome/a/answer/7100626?hl=en
> This removes a small maintenance burden and prevents future bugs like the
> ones we investigated. Also, in practice, intel hardware older than Pentium
> 4-era machines is very rare. All this considered, we decided it made sense
> to do the same in WebKit.
> In short, this email is a RFC to see if anyone in the WebKit community
> objects to this change, or has any comment about it. The bug where we have
> attached the patch for this change is:
> https://bugs.webkit.org/show_bug.cgi?id=194853
> Regards,
> Xan
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