i486 base architecture
Arjan van de Ven
arjanv at redhat.com
Tue Nov 30 17:27:06 UTC 2004
On Tue, 2004-11-30 at 12:05 -0500, William M. Quarles wrote:
> performance difference. Now were you saying that this cmov is part of
> i486 or i686?
i686
> Would I have to worry about any trademark problems?
?????
> Is there a script that Red Hat uses to automate the build process? Does
> it use SRPMS or do the sources and specs have to be "preinstalled?"
srpms; what you can do yourself is install most of the rpms (so that all
buildrequires are met), then get the src.rpm's in one dir and do
for i in *.src.rpm ; do rpmbuild --rebuild --target i686 $i ; done
for a first cut approximation... takes 24 to 36 hours though.
> > However, newer ones (both AMD and Intel) operate in such a way that the
> > advantage of this no longer is an advantage, they need to know the
> > result anyway in effect (and also make a guess about the "if" result)
>
> Is the advantage still there
not anymore
> , or is it just no longer a significant
> advantage? Or is it a cost? Unless it's a cost, I don't see what's
on newest P4 cores it seems to be a cost even (given that cmov can't do
all the addressing combinations normal mov can, gcc may have to add some
slight additional glue code which is a cost)
> wrong with putting in the advantage, unless it's a lot more work on your
> part. Is it more work?
it means that you don't run on cpus without cmov...
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