[Mono-dev] Enabling Support for SIMD Intrinsics

[Justin Holewinski]

How much work is left in the port to amd64?  I have only skimmed the code
for the Mono JIT compiler, but if there are some smaller tasks that need
done, I could try to help.


Thanks,

Justin Holewinski

2009/1/22 Jerry Maine <crashfourit at gmail.com>

>  Justin, you could help remedy that yourself and finish the simd port
> for amd64 in the jit engine or at least help with it.
>
> Rodrigo Kumpera wrote:
> > Yes, mono 2.2 and 2.4 will only feature simd support for x86 32
> > bits.
> >
> > 2009/1/22 Justin Holewinski <shawmishrak at gmail.com
> > <mailto:shawmishrak at gmail.com> <shawmishrak at gmail.com>>
> >
> > Is there a special configure script option to enable the SIMD
> > intrinsic optimizations?
> >
> > I just compiled Mono from the 2.2 sources and compiled/executed the
> > following C# code snippet:
> >
> > Console.WriteLine("SIMD Mode:  {0}",
> > SimdRuntime.AccelMode.ToString());
> >
> > This is printing out  "SIMD Mode:  None" regardless of the -O
> > option to mono.  I have tried -O=simd and -O=all.
> >
> > I also tried the SIMD examples available at
> > http://tirania.org/blog/archive/2008/Nov-03.html (linked from Mono
> > 2.2 Release Notes) and noticed no difference between the -O=simd
> > and -O=-simd comparisons, and both were significantly slower than
> > the C version.  This leads me to believe the code snippet above is
> > not just lying to me.
> >
> > This is on Fedora 9 x86_64 with an Intel Core i7 920 processor
> > (definitely has SSE support!).  Is SIMD support only available on
> > x86 (32-bit)?
> >
> >
> > Thanks,
> >
> > Justin Holewinski
> >
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