   0  getfield_gc_r %r0, FieldDescr<rpython.rlib.streamio.CallbackReadFilter.inst_callback> -> %r0
   5  getfield_gc_r %r0, FieldDescr<pypy.module._file.interp_file.W_File.inst_stream> -> %r0
  10  -live- %i0, %r0
  13  goto_if_not_ptr_iszero %r0, L1
  17  L2:
  17  residual_call_ir_r $<* fn BufferingInputStream.read>, I[%i0], R[$<* struct rpython.rlib.streamio.Stream>], <CallDescr(ri) EF=7> -> %r0
  26  -live- %r0
  29  ref_return %r0
  31  ---
  31  L1:
  31  -live- %i0, %r0
  34  guard_class %r0 -> %i1
  37  getfield_raw_i %i1, FieldDescr<rpython.rlib.streamio.Stream_vtable.cls_flush> -> %i1
  42  -live- %i0, %i1, %r0
  45  int_guard_value %i1
  47  residual_call_r_v %i1, <IndirectCallTargets>, R[%r0], <CallDescr(r) EF=7>
  53  -live- %i0
  56  goto L2
