https://bugs.kde.org/show_bug.cgi?id=354931
mchesh...@gmail.com changed:
What |Removed |Added
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CC| |mchesh...@gmail.com
--- Comment #1 from mchesh...@gmail.com ---
I have same thing.
Gentoo amd64
Qt 5.4.2
Intel(R) Core(TM) i7-4600M CPU @ 2.90GHz
What I found:
I have -march=native in CFLAGS, that cause gcc to enable -mrtm on my CPU
$ LANG=C gcc -march=native -Q --help=target | grep rtm
-mrtm [enabled]
It reflects __RTM__ define, and qCompilerCpuFeatures now includes RTM
(http://code.qt.io/cgit/qt/qtbase.git/tree/src/corelib/tools/qsimd_p.h?id=fae33bfbe35f8d082b420ee09662ff60634cb355&h=5.4#n264),
and requires it in runtime.
But all amd64 CPUID helpers have nothing set in RBX if EAX is 0x80000007.
That does not hit HLE, because Qt disable check in runtime
(http://code.qt.io/cgit/qt/qtbase.git/tree/src/corelib/tools/qsimd.cpp?id=fae33bfbe35f8d082b420ee09662ff60634cb355&h=5.4#n499)
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