   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- %r0
  13  goto_if_not_ptr_iszero %r0, L1
  17  L2:
  17  residual_call_r_r $<* fn BufferingInputStream.readall>, R[$<* struct rpython.rlib.streamio.Stream>], <CallDescr(r) EF=7> -> %r0
  24  -live- %r0
  27  ref_return %r0
  29  ---
  29  L1:
  29  -live- %r0
  32  guard_class %r0 -> %i0
  35  getfield_raw_i %i0, FieldDescr<rpython.rlib.streamio.Stream_vtable.cls_flush> -> %i0
  40  -live- %i0, %r0
  43  int_guard_value %i0
  45  residual_call_r_v %i0, <IndirectCallTargets>, R[%r0], <CallDescr(r) EF=7>
  51  -live-
  54  goto L2
