[Liboil] Is liboil still alive?
ds at entropywave.com
Sat Feb 21 20:42:08 PST 2009
On Fri, Feb 20, 2009 at 01:26:07PM -0500, Jeff Squyres wrote:
> On Feb 20, 2009, at 11:32 AM, Thiago Galesi wrote:
> >> - Does oil_u8_copy() make non-temporal copies?
> > Ok, AFAIK (and that's what I remember from the docs)
> I re-checked the docs, and they don't say:
Everything in liboil is assumed to be cache-to-cache, so there's
no prefetch and no cache-bypassing writes. This is a big
limitation for certain users, but unfortunately difficult to
avoid without having 3 versions of each function. (Actually
more, since there are multiple types of cache bypassing, and
additional combinatorics.) The Orc project will attempt to address
this, if I ever get time to work on it.
> (Open MPI has some assembly code in it, but the main developer of that
> is gone; it's difficult to maintain now that we no longer have anyone
> with expertise with assembly)
It's difficult to maintain even when you have years of assembly
> I do see *some* assembly in liboil/*/*copy*.c. Does anyone know if
> any of these have non-temporal copies? There's no real comments to
> explain, and I have no idea what the assembly for non-temporal copies
> looks like...
It would use one of the instructions movntq, movntdq, movntps, or
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