http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54855
--- Comment #6 from Marc Glisse <glisse at gcc dot gnu.org> 2012-10-20 17:43:44 UTC --- Uros' reply at http://gcc.gnu.org/ml/gcc-patches/2012-10/msg01327.html copied here for convenience: "But, we _do_ have vec_merge pattern that describes the operation. Adding another one to each operation just to satisfy combine is IMO not correct approach. I'd rather see generic RTX simplification that simplifies your proposed pattern to vec_merge pattern. Also, as you mention in PR54855, Comment #5, the approach is too fragile..."
