[Mono-dev] autovectorization

[Rodrigo Kumpera]

Doing loop unrolling in a profitable way is a lot harder than it looks,
specially in a JIT scenario, with constrained
execution budget.

I guess that you're underestimating the complexity of either doing
profitable unrolling or auto-vectorization. It took
the GCC people more than 3 years to get into decent shape, for example.

But feel free to prove me wrong and come up with a working prototype that
shows measurable gain.


On Mon, Jan 4, 2010 at 1:25 PM, Jerry Maine - KF5ADY
<crashfourit at gmail.com>wrote:

>  Because doing so is so expensive, i was thinking of only two
> optimizations.
>
> One is loop unrolling when moving over arrays.
>
> The next one is tailored to known programing patterns in C#, vectorizing
> only the homogeneous structs of size 16.
>
> The idea is that these optimizations may be cheep enough to do in the Jit,
> while others can be done in an external utility.
>
>
>
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