On Friday, 9 February 2018 08:36:59 PST Thiago Macieira wrote: > > Qt is built with SSE2 by default since 5.3.0. Is there a reason for not > > enabling by default SSE2 for application compilation ? If not I'll start > > working on a change doing that. > > Because we didn't want to force that on users. It's also easy to keep two > libraries on Linux, one for SSE2 and one for earlier versions. That can't be > done for binaries. > > Enabling SSE2 alone won't gain you much. You must also either switch to SSE > math (-mfp-math=sse)
One more thing: SSE2 is enabled by default on 64-bit, since it's part of the ABI, on all platforms. It's also enabled by default on 32-bit Mac (SSSE3 actually is), since the first x86 Macs had that. So that only leaves 32-bit builds for Windows and Linux, which are quickly disappearing. We haven't provided 32-bit binaries for Linux for a couple of releases already; the Windows ones are also disappearing. -- Thiago Macieira - thiago.macieira (AT) intel.com Software Architect - Intel Open Source Technology Center _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
