On Tue, May 10, 2016 at 7:05 PM, Ehsan Akhgari <ehsan.akhg...@gmail.com> wrote:
> On 2016-05-10 4:45 PM, Gregory Szorc wrote: > > On Thu, May 5, 2016 at 9:26 PM, Gregory Szorc <g...@mozilla.com> wrote: > > > >> There is a compiler bug in VS2015 that results in SSE instructions being > >> emitted when they shouldn't be. Since Firefox still needs to remain > >> compatible with ancient hardware that doesn't support SSE, this is > causing > >> crashes on Firefox built with VS2015 (see bug 1265615). > >> > >> The good news is glandium found a pretty minimal reproduce case and > >> reported the bug to Microsoft. > >> > >> The bad news is the issue still reproduces in the latest pre-release > >> version of the Visual C++ toolchain. > >> > >> The worse news is we'll have to revert to building Firefox 48 (current > >> Aurora) and 49 (current central) with VS2013. Bugs 1270664 and 1270714 > >> track. Aurora will likely land soon. Central might take a few days, as I > >> believe VS2013 is a bit broken on central at the moment. > >> > > > > We have a change in plans. > > > > bsmedberg says we can require SSE. So that means the VS2015 bug emitting > > SSE instructions isn't an issue. > > Firstly, great to hear this! > > But since the topic of when to drop support for legacy platforms seems > to be coming up a few times per week these days, it would be helpful to > document somewhere how the decision to drop support for processors not > supporting SSE was reached. Do we have data covering what number of > users will be affected by this change? Do we have guidelines on what's > the threshold for supporting other similar legacy configs? > > It would be helpful to see some information about this shared here. > > I don't know how this specific decision was reached but I did speak with Chris Cooper and Peter Dolanjski about developing criteria/guidelines for support today. I don't expect us to have something this month but we will flesh this out as part of the ongoing conversation about platform support. Lawrence _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
