Re: [tree-ssa] New regressions as of 2003-11-04

[Zdenek Dvorak <rakdver at atrey dot karlin dot mff dot cuni dot cz>]

Hello,

> > >  >Huh??? Timings of what?
> > >
> > > When I wrote remove_useless_stmts_and_vars I actually took the time to
> > > measure how it impacted compile-time performance.
> >
> > you wrote it working on cfg? Otherwise I don't see how the timing is
> > relevant.  Anyway, my patch does not change cfg at all and the only
> > thing it does is a simple pass over all statements, so I don't see a
> > potential for it to be slow.
> 
> This kind of reasoning is why GCC is slowing down all the time.
> 
> Yes, a pass over all statements _does_ have a compile time impact.  Especially 
> if we keep adding new ones by the dozens claiming that they don't impact 
> compile time.

well, the only thing I tried to argue is that the solution I use cannot
be slower than the previous one.  I did't not intend to argue about
usefulness of the pass, since I believe that people who put its
equivalent there did know what they are doing.

Zdenek