On Mar 17, 2011, at 5:31 AM, Nick Clifton wrote: >> You can set up the correct length even without using separate patterns. > > The problem is
And why is that a problem? You get to write arbitrarily complex C code that can depend upon insn and operands. I presume that you can do that. See: (set (attr "length") (symbol_ref "arm_attr_length_move_neon (insn)"))]) from arm, for example.
