[Bug tree-optimization/14741] graphite with loop blocking and interchanging doesn't optimize a matrix multiplication loop

[Joost.VandeVondele at mat dot ethz.ch]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14741

Joost VandeVondele <Joost.VandeVondele at mat dot ethz.ch> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|2006-04-23 17:57:20         |2013-03-29
                 CC|                            |Joost.VandeVondele at mat
                   |                            |dot ethz.ch
             Blocks|                            |51119
            Summary|missing transformations     |graphite with loop blocking
                   |lead to poorly optimized    |and interchanging doesn't
                   |code                        |optimize a matrix
                   |                            |multiplication loop
      Known to fail|tree-ssa                    |4.9.0

--- Comment #17 from Joost VandeVondele <Joost.VandeVondele at mat dot ethz.ch> 2013-03-29 11:03:40 UTC ---
With 4.9 trunk using 

gfortran -ffast-math -O3 -march=native -fgraphite -floop-interchange
-floop-block PR14741.f90

The testcase still runs about 8x slower than what ifort produces at -O3 -xHost.

This is too bad, and in my opinion blocks as simple solution for PR51119