https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68956
--- Comment #2 from Ilya Enkovich <ienkovich at gcc dot gnu.org> --- Caused by a misprint. Here is a patch: --- a/gcc/tree-vect-stmts.c +++ b/gcc/tree-vect-stmts.c @@ -1304,8 +1304,8 @@ vect_init_vector (gimple *stmt, tree val, tree type, gimple_stmt_iterator *gsi) all zeros or all ones value before building a vector. */ if (VECTOR_BOOLEAN_TYPE_P (type)) { - tree true_val = build_zero_cst (TREE_TYPE (type)); - tree false_val = build_all_ones_cst (TREE_TYPE (type)); + tree true_val = build_all_ones_cst (TREE_TYPE (type)); + tree false_val = build_zero_cst (TREE_TYPE (type)); if (CONSTANT_CLASS_P (val)) val = integer_zerop (val) ? false_val : true_val;