https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108008
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
CC| |rguenth at gcc dot gnu.org
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=107323
Known to work| |13.0
Keywords| |needs-bisection
--- Comment #13 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Alexander Monakov from comment #9)
> I think this is tree-ldist placing memset(sameZ, 0, zPlaneCount) after the
> loop, overwriting conditional 'sameZ[i] = true' assignments that happen in
> the loop.
>
> For the smaller testcase from comment #6, -O2 -ftree-loop-distribution is
> enough, namely:
>
> works:
>
> gcc-12 -O2 -ftree-loop-distribution -fno-tree-vectorize
> -fno-tree-loop-distribute-patterns
>
> breaks:
>
> gcc-12 -O2 -ftree-loop-distribution -fno-tree-vectorize
Note I can not reproduce on the branch after r12-8855-g19a9b5e587e87f52,
so maybe that's truly the duplicate.
Bisecting on the branch might reveal that.
