On terça-feira, 3 de maio de 2016 18:14:11 PDT Nuno Santos wrote: > Because, from my experience with the code compiled for Intel, putting -O3 > made a huge difference on the processing code of my audio app. But the same > might not be valid for arm. That’s why I’m asking.
-O3 not only enables all of -O2, but also enables optimisations that increase code size considerably. One of them is -ftree-vectorize, which is one of the reasons why your code and QtCore benefit a lot from it. I have no clue whether GCC's -ftree-vectorize support on ARM is any good. In any case, I doubt that you can count on Neon support on all those Android devices anyway, so it's likely that the gain is minimal anyway. PS: QtCore and QtGui are compiled with CONFIG += optimize_full, which enables -O3. -- 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
