   0  getfield_gc_r %r0, FieldDescr<rpython.rlib.rstruct.runpack.ReaderForPos0.inst_mr> -> %r1
   5  inline_call_ir_r <JitCode 'MasterReader.read'>, I[$2], R[%r1] -> %r1
  13  -live- %r0, %r1
  13  strgetitem %r1, $0 -> %i0
  17  int_lshift %i0, $0 -> %i0
  21  int_or %i0, $0 -> %i1
  25  strgetitem %r1, $1 -> %i0
  29  -live- %i0, %i1, %r0
  29  goto_if_not_int_ge %i0, $128, L1
  34  int_sub %i0, $256 -> %i0
  38  L2:
  38  int_lshift %i0, $8 -> %i0
  42  int_or %i1, %i0 -> %i0
  46  setfield_gc_i %r0, %i0, FieldDescr<rpython.rlib.rstruct.runpack.ReaderForPos0.inst_value>
  51  void_return
  52  ---
  52  L1:
  52  goto L2
