http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56766
--- Comment #2 from Marc Glisse <glisse at gcc dot gnu.org> --- Created attachment 30073 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30073&action=edit patch to recognize vec_merge This passes bootstrap+testsuite. I had to swap tem1 and tem2 in the example, which I think is in the wrong direction. I also had to change the addsub pattern because it was always canonicalized to this form. I don't know if that's what we want...
