[Development] Enabling SSE2 by default on x86 builds (32-bit)

Hausmann Simon Simon.Hausmann at digia.com
Tue Dec 10 20:52:35 CET 2013

Would it be possible to build libQtQml for i686/SSE2, install it into lib/sse2 and call it a day? I don't think it's worth shipping a pure i386 version of that library that's not going to perform on the hardware in question - more than 10 years old and no chance for GPU acceleration the way Qt needs it.

Fra: Rex Dieter
Sendt: 19:01 tirsdag 10. desember 2013
Til: development at qt-project.org
Emne: Re: [Development] Enabling SSE2 by default on x86 builds (32-bit)

Lisandro Damián Nicanor Pérez Meyer wrote:

> On Tuesday 10 December 2013 14:18:39 Lisandro Damián Nicanor Pérez Meyer
> wrote:
> [snip]
>> He also gave us some directions on how we could achieve this, feel free
>> to ping me if you need them.

> The idea (and please correct me if I've got something wrong) would be to:
> - Build Qt core with sse disabled.
> - After the above, for each library you want with SSE2 optimisations, cd
> src/libdir, qmake -config sse2, make && manually install in the
> LIBDIR/sse2 directory

So, for this to be workable, we'd need a canonical list of libraries that
want/need SSE2 optimizations.

While on the topic, and looking at qtdeclarative's JIT on i686,

would a similar workaround suffice for libQt5Qml?  build a normal sse2/jit
enabled version and stuff into LIBDIR/sse2 dir, and a non-sse2/jit into

-- Rex

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