How does visual studio support AVX?
On Sep 12, 2015 6:40 AM, "Kai Tietz" <ktiet...@googlemail.com> wrote:
> Hello,
>
> first thanks for interesting in this subject, but sadly I have
> disappoint you about it, I fear. The cause for the inability to align
> to 32-byte alignment is neither to seek in gcc, nor in mingw-w64
> itself. It is a consequence of the SEH-information required by the
> x64 ABI (see here as reference either msdn, or ibm's IA64
> exception-specification). Sadly there is no way to express by it any
> kind of stack-alignment. So it is impossible to write code, which
> brings AVX to proper stack-location within x64-ABI. The ABI itself
> makes sure that on function-entry stack has a 16-byte alignment, so
> 64-bit sse-registers can be stored aligned. Another weakness in this
> prologue-description used by x64 is that register with more then
> 64-bit width can't be expressed. This is a reason why the upper 8
> bytes of a ymm-register are treated as volatile.
>
> Only way to work-a-round that is to do manual alignment of function,
> and making sure that you won't try to unwind over such a function.
> The mentioned prologue/epilogue script on stack-overflow article seems
> to do exactly this.
>
> Regards,
> Kai Tietz
>
> 2015-09-11 23:53 GMT+02:00 Gabe Al-Ghalith <algh0...@umn.edu>:
> > Please see:
> >
> http://stackoverflow.com/questions/5983389/how-to-align-stack-at-32-byte-boundary-in-gcc
> >
> > and
> >
> http://stackoverflow.com/questions/32213338/gcc-vector-extensions-avx2-builtin-shuffle-crashes-when-m64-is-used
> >
> > Basically, AVX (since 2011) and now Skylake Xeon (with AVX-512) will be
> > completely unusable on Windows. Please fix this!
> >
> > Thanks,
> > Gabe
> >
> >
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