[Bug tree-optimization/18880] DSE is not doing its job for global variables

["pinskia at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-12-08 20:09 -------
(In reply to comment #5)
> Subject: Re:  DSE is not doing its job for
>         global variables
> >  but I should note that I found this while looking into a benchmark.
> Were you looking at the final output, or just the output from the SSA
> optimizers?  As I mentioned, we have a DSE that works on the RTL level
> which ought to have a reasonable chance of catching this.

Yes the RTL level one catches it.  I just filed it because it would help out on
memory usage sometimes.
> If you get a chance to play with the patch and benchmark it, that would
> be great.

I will try after I after I benchmark my tree combine pass which looks like it could
improve even the compile time speed as it removes some ifs which can be proved
to be always true.
 
> ps.  What benchmark?

dhrystone 2.0 but it might be a modified version as it was designed to run on DOS
and I modified it back to run on UNIX.

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18880