Remove unnecesary line number notes

[Richard Guenther]

On 11/10/06, Richard Guenther <richard.guenther@gmail.com> wrote:
> On 11/10/06, Jan Hubicka <jh@suse.cz> wrote:
> > > I believe the cfglayout.c hunk brought us a ~10% compile-time hit for
> > > c++bench
> > > (introduced between revs 118648 and 118650).  Maybe you are missing a
> > > continue; after it and check_block_change on that insn get's us slow?
> >
> > Well, the patch was supposed to do the exact oposite :) (tramp3d is
> > especially interesting testcase as it tends to produce several line
> > number notes for each instruction).
> > I think the code should be OK as it is - check_block is very cheap and
> > should work on deleted instruction and rest of the chunk is skipped as
> > notes are not active (not sure why the check_block call is not guarded
> > too).
> >
> > I guess what might happen is that number of RTL optimizers works on
> > window of fixed number of instructions and skipping notes might be
> > cheaper than processing real instruction, but all that is just if you
> > compile with -g that I would not expect.  Without that the patch should
> > really be NOP...
> >
> > I guess you don't have -ftime-report output handy?
>
> For tramp3d yes.  Wait...

Wait - it's PRE times exploding...  I have put in a local patch... aiieeee.

Ignore the mess, wait for tomorrow.

Richard.