# ins => { "in1", "in2" } # optional, creates n_op_in1, ... consts
# mode => "mode_Iu" # optional, predefines the mode
# emit => "emit code with templates",
-# attr => "attitional attribute arguments for constructor",
+# attr => "additional attribute arguments for constructor",
# init_attr => "emit attribute initialization template",
# rd_constructor => "c source code which constructs an ir_node",
# hash_func => "name of the hash function for this operation",