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>
Not removing QT_EMULATED_ALIGNOF logic from qglobal.h at this point, as
it might be used elsewhere.
Change-Id: Ie78922bb604a54aed03ab5b88e31a7f29a3a4de0
Fixes: QTBUG-73561
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Without this, a local build of this test on macOS fails.
Change-Id: Ie03fa47ff0a54db752af47f223fbe5724cd9c976
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
It should have been qfloat16(1)/qfloat16(infinity) in any case.
Sadly, that behaves no better than qfloat16(1.f/qfloat16(infinity)),
which was promoting the infinity back to float. So retain the check
for over-optimization (but make the comment more accurate).
This is a follow-up to d441f6bba7.
Change-Id: Iec4afe4b04081b0ebfbf98058da606dc3ade07f4
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
It's not clear why this test fails - and only does so sometimes - but
fail it does, so we ned to skip it to let development keep going. As
it happens, the same platform over-optimizes various computations
using qfloat16; which can at least be used to test for this platform,
since it wrongly distinguishes two qfloat16 values that theory and all
other platfomrs agree should coincide.
Fixes: QTBUG-75812
Change-Id: Ie9463d7dc21bca679337b475d13417b9f42bbf9b
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
[ChangeLog][qmake] A new feature "cmdline" was added that implies
"CONFIG += console" and "CONFIG -= app_bundle".
Task-number: QTBUG-27079
Change-Id: I6e52b07c9341c904bb1424fc717057432f9360e1
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
Some tests were fixed and others were skipped/blacklisted.
Task-number: QTBUG-63152
Change-Id: Ica7df555f8d152ee589865911130525101d4b941
Reviewed-by: Liang Qi <liang.qi@qt.io>
This way there is only one for loop, which is more optimizer friendly
Change-Id: Iaa02026627d5259c3eea1ff5664e8f22664eef73
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Since Qt 5.10, qTo/FromBig/LittleEndian<float/double> stopped working.
It may be confusing, but big endian floats do exist, so not to break old
code, we should support them.
Change-Id: I21cdbc7f48ec030ce3d82f1cd1aad212f0fe5dd0
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
This test triggered a compiler warning for good reason, it made no
sense, trying to change it to what it was probably meant to be.
Change-Id: I01a848272b42dae2aaa58a4f5bed998644d864da
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
tst_QtEndian's transformRegion_template() was getting a
signed/unsigned comparison warning when T was unsigned in a
QCOMPARE(T-value, 0); so use T(0) instead.
Change-Id: I78cb2ab96f79393def65ed2c020aa3039017ab92
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
[ChangeLog][QtCore][QByteArray] QByteArray::toInt(),
QByteArray::toDouble() and the other number conversion functions
now ignore leading and trailing whitespaces, as their QString
counterparts already did. For consistency reasons, the same
behavior was added to qEnvironmentVariableIntValue() also.
Task-number: QTBUG-66187
Change-Id: I8b5e478ea8577b811d969286ea9e269f539c1ea4
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
The compiler was generating some vectorized code for qresource.cpp but
it wasn't very efficient. So improve upon it and make use in other
places where we read UTF-16BE strings.
[ChangeLog][QtCore] Added an overload of q{To,From}{Big,Little}Endian
that operates on a memory region.
Change-Id: I6a540578e810472bb455fffd1531fa2f1d724dfc
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
The "app" subfolder was already excluded in the .pro-file but Android
supports QProcess, so lets include it in the build. Unfortunately it
currently has trouble and crashes (the child process or both processes).
So we skip those tests.
Task-number: QTBUG-68596
Change-Id: I2e6d0869c408bf08b22c02145db8ce522c64c617
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>
Not putting executables into debug/release subdirectories leads to the
WinRT AppxManifest being overwritten by the wrong configuration. When Qt
is configured with -release for example, it was possible that the debug
manifest (Manifest files are always created next to the target) is
written last and thus contains debug VCLibs as a dependency.
Additionally the test was changed in that way, that the resulting file
system structure (having helper and test application in a "top level"
debug and release folder) is the same structure as in tst_qobject.
Change-Id: I034752b4e5d22b98f6def95fb53c2b1947dded03
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@qt.io>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
This only enables compilation, it doesn't fix any test.
Qt on Android supports process, but not TEST_HELPER_INSTALLS. See also
acdd57cb for winrt.
android-ndk-r10e is used to compile, see
http://doc-snapshots.qt.io/qt5-5.11/androidgs.html .
corelib/io/{qdir,qresourceengine} need to be fixed later.
Done-with: Frederik Gladhorn <frederik.gladhorn@qt.io>
Done-with: Mårten Nordheim <marten.nordheim@qt.io>
Change-Id: I34b924c8ae5d46d6835b8f0a6606450920f4423b
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@qt.io>
This is a long overdue change so we don't break ADL of operator|.
I think will not break source or binary compatibility.
The problem is code like this:
namespace Foo {
struct MyStruct;
MyStruct operator|(MyStruct, MyStruct);
void someFunction() {
fooLabel->setAlignement(Qt::AlignLeft | Qt::AlignTop)
}
}
This would be an error before as ADL would find only the Foo::operator| and not
the global one since the arguments are not in the global namespace.
After this change, ADL works fine and this code compiles
This bites people with misterious error, see questions on
https://stackoverflow.com/questions/10755058/qflags-enum-type-conversion-fails-all-of-a-suddenhttps://stackoverflow.com/questions/39919142/broken-bitwise-or-operator-in-a-qt-project
[ChangeLog][QtCore] QFlags's operator| for enum types in the Qt namespace are
now declared in the Qt namespace itself.
Change-Id: I021bce11ec1521b4d8795a2cf3084a0be1960804
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
If _Thread_local is used on a block-scope declaration, it must be
combined with either static or extern to decide linkage.
Change-Id: I228b3520767197c6cdf5134ff5a666ab2aca33ea
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Commit 29bc68cf16 added support for
unsigned and commit 5ff7a3d96e later added
support for int. This commit adds support for qsizetype, which isn't int
on 64-bit platforms.
We do this by reorganizing the code and using the generic version of
__builtin_{add,sub,mul}_overflow from GCC 5 and Clang 3.8, which ICC 18
seems to support now too on Linux. That leaves older versions of GCC and
Clang, as well as MSVC, ICC on Windows, and the GHS compiler, to use the
generic implementations, as I've removed the assembly code those
versions of GCC and Clang on x86 are now uncommon.
Note: any older version of ICC probably breaks. We only support the
latest.
Change-Id: I9e2892cb6c374e93bcb7fffd14fc11bcd5f067a7
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
Also drops a few instances where the dependency was purely runtime,
especially for examples.
Change-Id: I2a0476f79928143596bdb3b8f01193af90574ae8
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
Unary ~ is not defined for enum classes, so we need a cast.
Change-Id: I79d495ebcc24ab960da8dae3be08eb307a9de448
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Both ARM and x86 can convert fp16 much faster in bulk than one at a
time. This also enables hardware accelerated conversion on x86, when
F16C isn't unconditionally available at compile time.
This code is implemented in C to ensure that there's no leakage of
inline symbols from the .obj file that was compiled by Visual Studio
with AVX support. Unfortunately, simd.prf uses $(CXX) instead of $(CC)
for all its sources, which means the file gets interpreted as C++ by
g++, clang++ and icpc. Those compilers at least don't leak any symbols.
Done-with: Thiago Macieira <thiago.macieira@intel.com>
Change-Id: I9d26d99e83392861fb09564e0e8e8d76cd8483b3
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Tested with Clang, GCC 4.5 & up, ICC 17 and MSVC 2017. No current
version of MSVC supports C11 and GCC implemented the features slightly
later in C than in C++.
Change-Id: I57a1bd6e0c194530b732fffd14f45c5074c9a052
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>
This brings us to almost parity with the C++11 Random Engine API
requirements (see chapter 26.5.1.4 [rand.req.eng]). We don't implement
the templated Sseq requirements because it would require moving the
implementation details to the public API. And we don't implement the
<iostreams> code because we don't want to.
Change-Id: Icaa86fc7b54d4b368c0efffd14f05ff813ebd759
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Since we don't document how many bytes one needs (it's 2496), it's
difficult for the caller to provide just enough data in the seed
sequence. Moreover, since std::mt19937 doesn't make it easy to provide
the ideal size either, we can't actually write code that operates
optimally given a quint32 range either -- we only provide it via
std::seed_seq, which is inefficient.
However, we can do it internally by passing QRandomGenerator to the
std::mersenne_twister_engine constructor, as it's designed to work.
Change-Id: Icaa86fc7b54d4b368c0efffd14f0613c10998321
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Now only QRandomGenerator::system() will access the system-wide RNG,
which we document to be cryptographically-safe and possibly backed by a
true HWRNG. Everything else just wraps a Mersenne Twister.
Change-Id: I0a103569c81b4711a649fffd14ec8cd3469425df
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Since we're adding a deterministic generator that inherently does not
use syscalls, and people should really use that one by default, there is
no point in optimizing the secure generator wrt syscalls. Besides,
keeping the random data in memory for longer than needed is likely
inadviseable.
Change-Id: Ib17dde1a1dbb49a7bba8fffd14ed0871117fe930
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Right now,this does really nothing. This commit is just to allow us to
transition the other modules (besides qtbase) to use the syntax that
will become the API.
I've marked three places to use the system CSPRNG:
1) the QHash seed
2) QUuid
3) QAuthenticator
I didn't think the HTTP multipart boundary needed to be
cryptographically safe, so I changed that one to the global generator.
Change-Id: Ib17dde1a1dbb49a7bba8fffd14ecf1938bd8ff61
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
The previous version was good, just not optimal. Because the input was
an unsigned 64-bit number, compilers needed to generate extra code to
deal with HW instructions that only convert 64-bit signed input. And
that was useless because a double uniformly distributed from 0 to 1 can
only have 53 bits of randomness.
The previous implementation did exactly what the Microsoft libstdc++ and
libc++ implementations do. In my opinion, those implementations have an
imperfect distribution, which is corrected in this commit. In those, all
random input bigger than 0x20000000000000 has a different frequency
compared to input below that mark. For example, both 0x20000000000000
and 0x20000000000001 produce the same result (4.8828125e-4).
What's more, for the libc++ and MSVC implementations, input between
0xfffffffffffff001 and 0xffffffffffffffff results in 1.0 (probability 1
in 2⁵³), even though the Standard is very clear that the result should
be strictly less than 1. GCC 7's libstdc++ doesn't have this issue,
whereas the versions before would enter an infinite loop.
Change-Id: Ib17dde1a1dbb49a7bba8fffd14eced3c375dd2ec
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Error out if it's missing or broken (Mersenne Twister not present).
This ensures that we never have a low-quality random generator in Qt.
Change-Id: I0a103569c81b4711a649fffd14ec80649df7087e
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
"generate" is better than "get", and we already have "generate(it, it)"
which uses std::generate(). This changes:
- get32() → generate()
- get64() → generate64() and QRandomGenerator64::generate()
- getReal() → generateDouble()
Change-Id: I6e1fe42ae4b742a7b811fffd14e5d7bd69abcdb3
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
[ChangeLog][QtCore] Added qEnvironmentVariable, which returns the value
of an environment variable in a QString, while qgetenv continues to be
used to return it in a QByteArray. For Unix, since most environment
variables seem to contain path names, qEnvironmentVariable will do the
same as QFile::decodeName, which means NFC/NFD conversion on Apple OSes.
I opted not to #include <qfile.h> from qglobal.cpp to implement that
QFile::decodeName functionality, so qglobal.cpp doesn't depend on
corelib/io and to avoid possible recursions.
Task-number: QTBUG-41006
Change-Id: I14839ba5678944c2864bffff141794b8aaa7aa28
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Found while working on suppressing the warning about the return value
(which is either 0 or -1) was being ignored.
Task-number: QTBUG-61968
Change-Id: I02d22222fff64d4dbda4fffd14d148b1724547ca
Reviewed-by: Florian Bruhin <qt-project.org@the-compiler.org>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
