https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115669
--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> --- OK, so the issue is the SLP child order is different than the scalar stmt operand order and inconsistent with what we have recorded in reduc_idx. Likely because we do t.c:6:23: note: pre-sorted chains of plus_expr plus_expr -1 plus_expr b.2_7 minus_expr _5 and that requires -fwrapv. I think this is a latent issue possibly triggerable with a masked SLP reduction.
