Re: Fix PR tree-optimization/28778, 29156, and 29415

["Daniel Berlin" <dberlin at dberlin dot org>]

On 10/20/06, Jan Hubicka <hubicka@ucw.cz> wrote:
> > This large patch fixes three P1 regressions, 28778, 29156, 29415.
> >
> > The basic issue in all three is that previously, we had no way to
> > describe accesses to nonlocal memory.   When we had no addressable
> > variables, we generated no conflicting vuses, even if we were
> > dereferencing pointers or passing them to other functions.
> >
> > As our aliasing has gotten better, it eventually got to the point
> > during 4.2 that we could eliminate all local aliases, and be left with
> > nothing to say things aliased.  It was still possible to construct
> > these cases with 4.x, it's just *much much* harder.
> > Sadly, there is no smaller, less risky, and correct fix i can think of
> > for this problem that will not cause either massive compile time
> > explosion, or massive performance loss (I tried some before making
> > this statement).
>
> Hi,
> sadly this patch cause up to 9% memory consumption increase on my
> testsuite (and the increase is almost consistent across all testcases).
> New memory logs are http://www.suse.de/~aj/SPEC/amd64/memory
> if you need the logs just before the run, I can get them easilly.

I'm aware.
The other patches would have been about 50% memory consumption
increase, and about 30-50% compile time slowdown (yeah, those are real
numbers, the number of vops just goes ballistic).

Try the attached and let me know if it helps please!

Attachment: speedup.diff
Description: Binary data