https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87953
Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |ASSIGNED Last reconfirmed| |2018-11-09 Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org Ever confirmed|0 |1 --- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> --- valgrind reports ==21312== Conditional jump or move depends on uninitialised value(s) ==21312== at 0x14BB78D: vectorizable_condition(_stmt_vec_info*, gimple_stmt_iterator*, _stmt_vec_info**, tree_node*, int, _slp_tree*, vec<stmt_info_for_cost, va_heap, vl_ptr>*) (tree-vect-stmts.c:8718) ==21312== by 0x14DCDC0: vectorizable_reduction(_stmt_vec_info*, gimple_stmt_iterator*, _stmt_vec_info**, _slp_tree*, _slp_instance*, vec<stmt_info_for_cost, va_heap, vl_ptr>*) (tree-vect-loop.c:6531) so that's probably the very same thing. reduc_index is -1 here. I have a fix.