[PATCH v3 2/2] powerpc: add support for csum_add()

David Laight David.Laight at ACULAB.COM
Wed May 27 18:41:01 AEST 2015

From: Scott Wood
> Sent: 26 May 2015 20:43
> > I was thinking of all 64bit targets, not 32bit ones.
> Oh, you mean move it out of arch/powerpc?  Sounds reasonable, but
> someone should probably check what the resulting code looks like on
> other common arches.  OTOH, if we're going to modify non-arch code,
> that might be a good opportunity to implement Segher's suggestion and
> move to a 64-bit accumulator.

Or more likely: adding alternate 32bit words to different 64-bit
registers in order to reduce the dependency chains further.
I'm sure I've seen a version that does that somewhere.


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