https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66873
--- Comment #9 from vries at gcc dot gnu.org --- (In reply to vries from comment #7) > Created attachment 35986 [details] > Updated tentative patch > > I found that always doing graphite before parloops resulted in failures to > parallelize reduction testcases. > That was due to not using -ffast-math. By using this ( https://gcc.gnu.org/ml/gcc-patches/2015-07/msg01863.html ) approved patch, we no longer have that problem. However, we run into: PR66997 - outer loop reduction fails to parallelize with graphite. And the runtime of graphite is excessive in some cases, with prevents us from using graphite by default, f.i. Bug 53852 - [4.9/5/6 Regression] -ftree-loop-linear: large compile time / memory usage.
