   0  new_with_vtable <rpython.jit.backend.llsupport.descr.SizeDescr object at 0x10090c3d950> -> %r1
   4  setfield_gc_r %r1, %r0, FieldDescr<rpython.rlib.rstruct.runpack.MasterReader.inst_input>
   9  setfield_gc_i %r1, $0, FieldDescr<rpython.rlib.rstruct.runpack.MasterReader.inst_inputpos>
  14  inline_call_ir_r <JitCode 'MasterReader.read'>, I[$1], R[%r1] -> %r0
  22  -live- %r0
  22  strgetitem %r0, $0 -> %i0
  26  int_is_true %i0 -> %i0
  29  int_return %i0
