diff options
| author | Dmitry Kazakov <dimula73@gmail.com> | 2019-09-05 10:23:08 +0300 |
|---|---|---|
| committer | Dmitry Kazakov <dimula73@gmail.com> | 2019-09-26 19:52:50 +0300 |
| commit | 5839714d986f28412c9f9ed4801d1bf9378f7b51 (patch) | |
| tree | 72f48ba65dbb68ceec5acc65658903bd7eff30ab /src/corelib/global/qrandom_p.h | |
| parent | d5abda313dab0f83873d34b7c4ddbe8d8a06dacf (diff) | |
Fix QRandomGenerator initialization on AMD CPUs
Some AMD CPUs (e.g. AMD A4-6250J and AMD Ryzen 3000-series) have a
failing random generation instruction, which always returns
0xffffffff, even when generation was "successful".
This code checks if hardware random generator generates four consecutive
equal numbers. If it does, then we probably have a failing one and
should disable it completely.
Change-Id: I38c87920ca2e8cce4143afbff5e453ce3845d11a
Fixes: QTBUG-69423
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Diffstat (limited to 'src/corelib/global/qrandom_p.h')
| -rw-r--r-- | src/corelib/global/qrandom_p.h | 8 |
1 files changed, 0 insertions, 8 deletions
diff --git a/src/corelib/global/qrandom_p.h b/src/corelib/global/qrandom_p.h index 917a91098e..4a0adff51c 100644 --- a/src/corelib/global/qrandom_p.h +++ b/src/corelib/global/qrandom_p.h @@ -79,14 +79,6 @@ extern Q_CORE_EXPORT QBasicAtomicInteger<uint> qt_randomdevice_control; enum { qt_randomdevice_control = 0 }; #endif -inline bool qt_has_hwrng() -{ -#if defined(Q_PROCESSOR_X86) && QT_COMPILER_SUPPORTS_HERE(RDRND) - return qCpuHasFeature(RDRND); -#else - return false; -#endif -} QT_END_NAMESPACE |