path: root/config.tests/x86_simd/main.cpp
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* QRandom: add support for RDSEEDThiago Macieira2019-10-091-0/+17
| | | | | | | | | | | | | | | The Intel whitepaer[1] recommends using the RDSEED over RDRAND whenever present. libstdc++ from GCC 10 will also use it in std::random_device. [ChangeLog][QtCore][QRandomGenerator] The system() random generator will now use the RDSEED instruction on x86 processors whenever available as the first source of random data. It will fall back to RDRAND and then to the system functions, in that order. [1] Change-Id: I907a43cd9a714da288a2fffd15bab176e54e1975 Reviewed-by: Edward Welbourne <>
* x86: Disable AVX support on 64-bit MinGWThiago Macieira2019-02-061-0/+3
| | | | | | | | | | | | | | | | | GCC for 64-bit Windows has a bug that it fails to properly re-align the stack pointer for use with 256-bit memory addresses (AVX). Therefore, there's about a 50/50 chance that any function using AVX will have an improperly-aligned stack. In release mode, stack accesses should be rare, but in debug mode they happen frequently. Either way, this is a ticking time bomb, so we disable. Clang is not affected. 32-bit MinGW is not affected. 64-bit in other OSes with GCC are not affected. Fixes: QTBUG-73539 Change-Id: Id061f35c088044b69a15fffd1580967808f31671 Reviewed-by: Allan Sandfeld Jensen <>
* Centralize the x86 SIMD testing in one placeThiago Macieira2017-11-301-1/+1
| | | | | | | | Since the x86_simd/main.cpp file already has all the source for each and every test anyway, just reuse it. Change-Id: I938b024e38bf4aac9154fffd14f779f450827fb9 Reviewed-by: Oswald Buddenhagen <>
* Add a configure-time check for QT_COMPILER_SUPPORTS_SIMD_ALWAYSThiago Macieira2017-11-301-0/+253
This has two main benefits: 1) introduces a qmake CONFIG we can use in .pro/.pri/.prf files 2) removes the need to keep an up-to-date list of which compilers support the feature The test is implemented as trying to compile every single SIMD test we currently have, but without passing the -mXXX option. The reason for trying all of them is that some people may have modified their mkspecs to add -mXXX options or -march=XXX, which could enable the particular feature we tried, resulting in a false positive outcome. Change-Id: I938b024e38bf4aac9154fffd14f7784dc8d1f020 Reviewed-by: Oswald Buddenhagen <>