http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53424
--- Comment #4 from Joseph S. Myers <jsm28 at gcc dot gnu.org> --- Created attachment 31371 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31371&action=edit Patch to tree_invariant_p_1 I tried restricting tree_invariant_p_1 as in the attached patch, but while this fixes the bug it causes regressions FAIL: gnat.dg/vect1.adb scan-tree-dump-times vect "vectorized 1 loops" 15 and similar for vect2.adb through vect6.adb. It seems Ada vectorization is somehow relying on certain trees being treated as invariant when similar C trees aren't invariant; I'd hoped that it wouldn't matter much because the GIMPLE optimizers should eliminate any unnecessary temporaries.