[Bug rtl-optimization/32084] gfortran 4.3 13%-18% slower for induct.f90 than gcc 4.0-based competitor

[ubizjak at gmail dot com]

------- Comment #4 from ubizjak at gmail dot com  2007-06-27 11:24 -------
(In reply to comment #3)

> The problem is in -ftree-vectorize

The difference is, that without -ftree-vectorize the inner loop (do k = 1, 9)
is completely unrolled, but with vectorization, the loop is vectorized, but
_not_ unrolled. Since the vectorization factor is only 2 for V2DF mode vectors,
we loose big time at this point.

My best guess for unroller problems would be rtl-optimization.


-- 

ubizjak at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|dorit at gcc dot gnu dot org|
          Component|tree-optimization           |rtl-optimization


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32084