* Andy Lutomirski <[email protected]> wrote:
> > Whatever. I got enough profile data to say that it seems to have
> > cut 'iret' overhead by at least two thirds. So it may not *work*,
> > but from a "hey look, some random numbers" standpoint it is worth
> > playing with.
>
> :)
>
> Is there actual interest in turning something like this into a real
> patch? It would almost certainly have to default off and no one
> sane would ever use it except for special-purpose machines.
The macro speedup looks rather impressive, and we've done ugly things
for far smaller speedups.
But I don't think it should be a 'special mode'. It either is made to
work unconditionally and can be a prime speedup to be proud of in a
politely disgusted fashion, or we don't want the complexity (and
future bitrot) of some special switch.
At minimum it can be a "look we want this speedup in hardware"
testcase to CPU designers.
Thanks,
Ingo
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