diff options
author | Thiago Macieira <thiago.macieira@intel.com> | 2017-11-16 10:58:54 -0800 |
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committer | Thiago Macieira <thiago.macieira@intel.com> | 2017-11-19 23:27:38 +0000 |
commit | 8e387e7fa758ded3f0d096dcf5fe13a22521dad7 (patch) | |
tree | 26f50b5f9bbada6f6f99faf214198da6620c86ce /src | |
parent | a4113d0c644edba1c39d9d268a259e95ae51c61e (diff) |
qsimd.cpp: Remove workaround for GCC 4.2
That's long fallen out of support in Qt.
Change-Id: I938b024e38bf4aac9154fffd14f7a603baa24e04
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
Diffstat (limited to 'src')
-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()) { |