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[Bug tree-optimization/70102] Tree re-association prevents SLP vectorization at -Ofast.
- From: "rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 10 Mar 2016 11:49:08 +0000
- Subject: [Bug tree-optimization/70102] Tree re-association prevents SLP vectorization at -Ofast.
- Auto-submitted: auto-generated
- References: <bug-70102-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70102
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Note that LIM after reassoc performs store motion but that's too late for
reassocs heuristic involving reductions. Which means we have a pass ordering
issue between reassoc and LIM (store motion to be precise, for the invariant
part reassoc is needed before LIM).