This is the mail archive of the
gcc@gcc.gnu.org
mailing list for the GCC project.
Re: IRA for GCC 4.4
On Thu, 2008-04-24 at 16:51 +0200, Paolo Bonzini wrote:
> >> (The testcase is 400k lines of preprocessed Fortran code, 16M is size,
> >> available here:
> >> http://www.pci.unizh.ch/vandevondele/tmp/all_cp2k_gfortran.f90.gz)
> >>
> >>
> > Thanks, I'll check it.
>
> Vlad, I think you should also try to understand what does trunk do with
> global (and without local allocation) at -O0. That will give a
> measure of the benefit from Peter's patches for conflict graph building.
I took a patch from Ken/Steven that disabled local_alloc and instead runs
global_alloc() at -O0 and summing up all of the bit matrix allocation
info we emit into the *.greg output, the new conflict builder saves a lot
of space compared to the old square bit matrix (almost 20x less space).
Here's the accumulated data for the test case above:
compressed upper triangular: 431210251 bits, 53902848 bytes
upper triangular: 4264666581 bits, 533084851 bytes
square: 8531372796 bits, 1066423618 bytes
Peter