   0  getfield_gc_i %r0, FieldDescr<pypy.module.struct.formatiterator.PackFormatIterator.inst_pos> -> %i2
   5  int_neg %i2 -> %i1
   8  int_and %i1, %i0 -> %i3
  12  int_add %i2, %i3 -> %i0
  16  L1:
  16  -live- %i0, %i2, %i3, %r0
  16  goto_if_not_int_ge %i2, %i0, L2
  21  getfield_gc_i %r0, FieldDescr<pypy.module.struct.formatiterator.PackFormatIterator.inst_pos> -> %i0
  26  int_add %i0, %i3 -> %i0
  30  setfield_gc_i %r0, %i0, FieldDescr<pypy.module.struct.formatiterator.PackFormatIterator.inst_pos>
  35  void_return
  36  ---
  36  L2:
  36  int_copy %i2 -> %i1
  39  int_add %i1, $1 -> %i2
  43  getfield_gc_r %r0, FieldDescr<pypy.module.struct.formatiterator.PackFormatIterator.inst_wbuf> -> %r1
  48  -live- %i0, %i1, %i2, %i3, %r0, %r1
  48  guard_class %r1 -> %i4
  51  getfield_raw_i %i4, FieldDescr<rpython.rlib.buffer.Buffer_vtable.cls_setitem> -> %i4
  56  -live- %i0, %i1, %i2, %i3, %i4, %r0, %r1
  56  int_guard_value %i4
  58  residual_call_ir_v %i4, <IndirectCallTargets>, I[%i1, $'\x00'], R[%r1], <CallDescr(rii) EF=7>
  67  -live- %i0, %i2, %i3, %r0
  67  goto L1
