The set values didn't match tested values, as the enum were already
on flag form.
Pick-to: 6.1 6.0 5.15
Change-Id: I9e8b0d419682122e8d40cd47bd68d840386c2066
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
All Mac Pros launched since 2019 have AVX512 support (CLX processor) but
the Darwin kernel does not enable the state bits in the XCR0 register
for all processes by default. Instead, it traps the #UD exception and
decodes the instruction to find out if it was an AVX512 instruction. If
so, it adds memory to the thread's context switch space. See [1].
Good solution, but forces us to have OS-specific code to determine if
the OS really supports AVX512. No other OS appears to require this. For
future features (namely, Intel Advanced Matrix Extensions), there's an
official way of implementing this, via the eXtended Feature Disable
register.
Qt has no AVX512 code yet, so this is just being future-proof. Apple has
yet to announce when or if their Mac Pros will switch from Intel Xeon to
ARM.
[1] https://github.com/apple/darwin-xnu/blob/xnu-4903.221.2/osfmk/i386/fpu.c#L174
Change-Id: Ieffc3453b88c4517a1dbfffd162175ead343e622
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
qsimd.cpp(636): error: argument of type "qregisteruint={quint64={unsigned long long}} *" is incompatible with parameter of type "unsigned long *"
Pick-To: 5.15
Change-Id: I99ab0f318b1c43b89888fffd160c4785c98adc4d
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
It's not used in tools at all and fits a lot better in global.
Also fix the qsimd_x86* files to have a proper copyright
header.
Change-Id: Id3d8e7cfcd7769a1ca9f3d8cf6d357a31a99ba40
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Allan Sandfeld Jensen
Thiago Macieira
Lars Knoll