On Tue, 20 Jan 2015 12:17:35 -0800 Christopher Head wrote: > On January 20, 2015 12:47:03 AM PST, Alexis Ballier <aball...@gentoo.org> > wrote: > >So, you're telling me that if you have a list of 90 cpu extensions, you > >will from time to time open that list to see if there is a 91st one > >added ? I think most people won't even notice, at best they'll look for > >the changelog. > > No, actually, I’m advocating the exact opposite. I’m saying that, as long as > the list file is kept up to date, then I will look at those 90 flags when I > first install and never again. If a 91st flag appears some day, then as long > as the file was maintained as I described in an earlier message (i.e. flags > are added as soon as manufacturers announce features), I already know I can > reliably ignore the new flag. After all, if the flag didn’t exist when I > installed the system, then my CPU must necessarily not have that > feature—unless CPUs are in the habit of sprouting new instructions after you > buy them!
Not exactly. CPUs are not in a habit, but software is. Some brand new instuction set may be supported in (any of) packages with some delay. Thus it is possible that instruction set supported by your CPU will appear in the list of cpu flags after your ininial install. Best regards, Andrew Savchenko
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