[Mono-dev] Patch for IPAddress.cs

Gareth Pearce tilps.kilm at gmail.com
Sat Mar 24 22:04:46 EDT 2007

>     >
>     > However, as a comparison, the MS.NET <http://MS.NET>
>     <http://MS.NET> implementation
>     > completes 15 loops of the benchmark in a mere 6718ms ;)
>     >

On this point, I suspect AOT compilation of the .Net system assemblies 
may be making the difference.  The AOT might be able to recognize 
certain patterns are equivalent to rot instructions and replace a bunch 
of shifts and masks with a set of unsigned rots.

A 32bit reorder is rot 8 on each of the 16 bit sections and a rot 16 on 
the full variable.  I think that can be done in 3 clocks on x86 - but my 
assembly is rusty.


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