http://doc.qt.digia.com/4.6/qtglobal.html#qreal-typedef
typedef qreal
Typedef for double on all platforms except for those using CPUs with ARM
architectures. On ARM-based platforms, qreal is a typedef for float for
performance reasons.
This still seems to be the case for 4.8 as well.
This lead to the following compile error on arm in kst:
/builddir/build/BUILD/kst-2.0.7/src/libkstapp/plotrenderitem.cpp:561:33:
error: no matching function for call to 'qMin(double&, qreal)'
y = qMin(y, plotItem()->yMax());
^
If there is scientific type codes using qreal this might lead to some
precision issues as well.
Is double really that much slower on arm?
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Orion Poplawski
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