diff options
Diffstat (limited to 'src/corelib/tools/qsimd.cpp')
| -rw-r--r-- | src/corelib/tools/qsimd.cpp | 26 |
1 files changed, 0 insertions, 26 deletions
diff --git a/src/corelib/tools/qsimd.cpp b/src/corelib/tools/qsimd.cpp index 4c6f08c774..25340f2d02 100644 --- a/src/corelib/tools/qsimd.cpp +++ b/src/corelib/tools/qsimd.cpp @@ -652,32 +652,6 @@ Q_CORE_EXPORT QBasicAtomicInteger<unsigned> qt_cpu_features[2] = { Q_BASIC_ATOMI void qDetectCpuFeatures() { -#if defined(Q_CC_GNU) && !defined(Q_CC_CLANG) && !defined(Q_CC_INTEL) -# if Q_CC_GNU < 403 - // GCC 4.2 (at least the one that comes with Apple's XCode, on Mac) is - // known to be broken beyond repair in dealing with the inline assembly - // above. It will generate bad code that could corrupt important registers - // like the PIC register. The behaviour of code after this function would - // be totally unpredictable. - // - // For that reason, simply forego the CPUID check at all and return the set - // of features that we found at compile time, through the #defines from the - // compiler. This should at least allow code to execute, even if none of - // the specialized code found in Qt GUI and elsewhere will ever be enabled - // (it's the user's fault for using a broken compiler). - // - // This also disables the runtime checking that the processor actually - // contains all the features that the code required. Qt 4 ran for years - // like that, so it shouldn't be a problem. - - qt_cpu_features[0].store(minFeature | quint32(QSimdInitialized)); -#ifndef Q_ATOMIC_INT64_IS_SUPPORTED - qt_cpu_features[1].store(minFeature >> 32); -#endif - - return; -# endif -#endif quint64 f = detectProcessorFeatures(); QByteArray disable = qgetenv("QT_NO_CPU_FEATURE"); if (!disable.isEmpty()) { |