Remark mk_mov_label:
  forall rd rs k c, mk_mov rd rs k = OK c -> tail_nolabel k c.Remark mk_shrximm_label:
  forall n k c, mk_shrximm n k = OK c -> tail_nolabel k c.Remark mk_shrxlimm_label:
  forall n k c, mk_shrxlimm n k = OK c -> tail_nolabel k c.Remark mk_intconv_label:
  forall f r1 r2 k c, mk_intconv f r1 r2 k = OK c ->
  (forall r r', nolabel (f r r')) ->
  tail_nolabel k c.Remark mk_storebyte_label:
  forall addr r k c, mk_storebyte addr r k = OK c -> tail_nolabel k c.Remark loadind_label:
  forall base ofs ty dst k c,
  loadind base ofs ty dst k = OK c ->
  tail_nolabel k c.Remark storeind_label:
  forall base ofs ty src k c,
  storeind src base ofs ty k = OK c ->
  tail_nolabel k c.Remark mk_setcc_base_label:
  forall xc rd k,
  tail_nolabel k (mk_setcc_base xc rd k).Remark mk_setcc_label:
  forall xc rd k,
  tail_nolabel k (mk_setcc xc rd k).Remark mk_jcc_label:
  forall xc lbl' k,
  tail_nolabel k (mk_jcc xc lbl' k).Remark transl_cond_label:
  forall cond args k c,
  transl_cond cond args k = OK c ->
  tail_nolabel k c.Remark transl_op_label:
  forall op args r k c,
  transl_op op args r k = OK c ->
  tail_nolabel k c.Remark transl_load_label:
  forall chunk addr args dest k c,
  transl_load chunk addr args dest k = OK c ->
  tail_nolabel k c.Remark transl_store_label:
  forall chunk addr args src k c,
  transl_store chunk addr args src k = OK c ->
  tail_nolabel k c.

Lemma transl_instr_label: forall f i ep k c, transl_instr f i ep k = OK c -> match i with Mlabel lbl => c = Plabel lbl :: k | _ => tail_nolabel k c end.