https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68707
--- Comment #19 from rguenther at suse dot de <rguenther at suse dot de> --- On December 16, 2015 8:24:49 PM GMT+01:00, "alalaw01 at gcc dot gnu.org" <gcc-bugzi...@gcc.gnu.org> wrote: >https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68707 > >--- Comment #18 from alalaw01 at gcc dot gnu.org --- >Well, we've seen this patch fix some of the vectorizer performance >regressions >we've had on some benchmarks. > >On SPEC...the "SLP cancelled" case triggers all over the place, but in >most of >those cases, doesn't lead to any codegen difference. (Presumably SLP >would have >failed anyway for some other reason, e.g. costs, and either we generate >load/store-lanes either way, or we still *can't* generate >load/store-lanes...). >The only sub-benchmark where codegen changes is facerec, where we seem >to >*lose* st2 rather than gain....this needs more analysis. Would be nice to have a reduced testcase for this one.
