Re: [PATCH]: Sparc SUN4V Niagara optimize memset/memcpy

["David S. Miller" <davem@davemloft.net>]

From: Roland McGrath <roland@redhat.com>
Date: Fri, 24 Feb 2006 17:08:23 -0800 (PST)

> > I've sent a patch for scripts/config.sub to config-patches the other
> > day, so that part of adding sparcv9v and sparc64v should show up
> > eventually.
> 
> As a rule we don't put in new configuration support until the canonical
> config.sub groks it.

config.sub really puts an unreasonable monkey wrench into the works
for doing development of new build targets for any GNU package.

It ususally takes about a week for a config.sub patch get handled,
integrated, and propagated into the necessary trees.  Nothing impedes
forward progress quite like this thing.

> > This adds the "sparcv9v-*" and "sparc64v-*" build targets, the
> > optimized memcpy/memset for that platform, and the necessary Implies
> > files.
> 
> I think this would be better done without Implies files.  Just use
> machine=sparc/sparc32/sparcv9/sparcv9v and the right things should happen.

Will that actually work?

I thought "machine=" takes a file path name, not a list of compatible
targets.  For example:

sparcv8plus | sparcv8plusa | sparcv9)
		base_machine=sparc machine=sparc/sparc32/sparcv9 ;;

I read that as meaning: search ${foo}/sparc/sparc32/sparcv9, else
${foo}/sparc/sparc32, else ${foo}/sparc