On quarta-feira, 11 de dezembro de 2013 09:12:22, Knoll Lars wrote: > Is this the right fix for 5.2? I'm a bit afraid that this would cause > Linux distributions to install the sse disabled QtQml by default, leading > to pretty bad performance.
I think so. Unless the distro specifically builds with -no-sse2[*], QtQml will be SSE2-only, which is the situation we had in Qt 5.0 and 5.1 anyway. Distros that need to ship, for some interesting reason, a non-SSE2 QtQml will need to start adapting to doing the trick right now. I had hoped to give them 4 months to prepare for 5.3, but this affects them now. > The other option for 5.2 would be to do runtime detection of SSE2 and > enable/disable the JIT according to that. That means a bigger library and we plan on removing the runtime option anyway in 5.3, so maybe not. [*] for 5.2.0, you need -no-sse2 -no-ssse3 -no-avx, at least, otherwise it will break the build. There's a fix in 5.2.1 for it (a071ba629b89dbbe458d0865a0c4ebc3f92d3524). -- Thiago Macieira - thiago.macieira (AT) intel.com Software Architect - Intel Open Source Technology Center
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