https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84252
--- Comment #1 from David Malcolm <dmalcolm at gcc dot gnu.org> --- In vt_add_function_parameter: (gdb) p incoming $6 = (parallel:OI [ (expr_list:REG_DEP_TRUE (reg:V4SI 32 v0 [ qIn0 ]) (const_int 0 [0])) (expr_list:REG_DEP_TRUE (reg:V4SI 33 v1 [ qIn0+16 ]) (const_int 16 [0x10])) ])