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

[spop at gcc dot gnu.org]

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

--- Comment #20 from Sebastian Pop <spop at gcc dot gnu.org> ---
-floop-nest-optimize does not have a cost model and so it blocks all loop
nests.
These two stmts are blocked:
A=0.1D0
B=0.1D0

This other stmt is not blocked:
   C(I,J)=C(I,J)+A(I,K)*B(K,J)

The only thing we can get from the dump file for this stmt is:
number of SCoPs: 0
most likely scop detection did not like something in that loop nest.