[Bug 1443] PowerPC in_cksum() requires optimization

[bugzilla-daemon at rtems.org]

https://www.rtems.org/bugzilla/show_bug.cgi?id=1443

--- Comment #3 from dufault at hda.com 2011-08-31 05:53:44 CDT ---
(In reply to comment #2)
> This version would introduce the first
(Wasabi Systems BSD advertising clause)
> > 
> in the cpukit/libnetworking.  I don't think it is good to have another
> advertising clause in the system.  Maybe we can fix the current version or use
> the current FreeBSD code?  We should also do some performance tests since this
> code is critical.

When I reported the bug I tried FreeBSD and it didn't work either.  Two notes:

1. RTEMS already has Wasabi advertising clauses, though not in
cpukit/libnetworking.  I understand not wanting to add more, though.

2. Anyone with time to look at this should look at the DragonflyBSD one.  It's
been split into two levels - a corner case level written in C to take care of
the boundaries, and a separate lower level designed to be hand-optimized or
written in assembler.  I think this makes perfect sense.

I don't have time to do this now, but eventually I want to try to use that and
write an MPC55XX SPE inner loop.

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