   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
  19  goto_if_not_int_ge %i2, %i0, L2
  24  getfield_gc_i %r0, FieldDescr<pypy.module.struct.formatiterator.PackFormatIterator.inst_pos> -> %i0
  29  int_add %i0, %i3 -> %i0
  33  setfield_gc_i %r0, %i0, FieldDescr<pypy.module.struct.formatiterator.PackFormatIterator.inst_pos>
  38  void_return
  39  ---
  39  L2:
  39  int_copy %i2 -> %i1
  42  int_add %i1, $1 -> %i2
  46  getfield_gc_r %r0, FieldDescr<pypy.module.struct.formatiterator.PackFormatIterator.inst_wbuf> -> %r1
  51  -live- %i0, %i1, %i2, %i3, %r0, %r1
  54  guard_class %r1 -> %i4
  57  getfield_raw_i %i4, FieldDescr<rpython.rlib.buffer.Buffer_vtable.cls_setitem> -> %i4
  62  -live- %i0, %i1, %i2, %i3, %i4, %r0, %r1
  65  int_guard_value %i4
  67  residual_call_ir_v %i4, <IndirectCallTargets>, I[%i1, $'\x00'], R[%r1], <CallDescr(rii) EF=7>
  76  -live- %i0, %i2, %i3, %r0
  79  goto L1
