Module CombineOpproof

Require Import Coqlib.
Require Import Integers Values Memory.
Require Import Op RTL CSEdomain.
Require Import CombineOp.

Section COMBINE.
Context `{memory_model_ops: Mem.MemoryModelOps}.

Variable ge: genv.
Variable sp: val.
Variable m: mem.
Variable get: valnum -> option rhs.
Variable valu: valnum -> val.
Hypothesis get_sound: forall v rhs, get v = Some rhs -> rhs_eval_to valu ge sp m rhs (valu v).

Lemma get_op_sound:
  forall v op vl, get v = Some (Op op vl) -> eval_operation ge sp op (map valu vl) m = Some (valu v).

Ltac UseGetSound :=
  match goal with
  | [ H: get _ = Some _ |- _ ] =>
      let x := fresh "EQ" in (generalize (get_op_sound _ _ _ H); intros x; simpl in x; FuncInv)
  end.

Lemma combine_compimm_ne_0_sound:
  forall x cond args,
  combine_compimm_ne_0 get x = Some(cond, args) ->
  eval_condition cond (map valu args) m = Val.cmp_bool Cne (valu x) (Vint Int.zero) /\
  eval_condition cond (map valu args) m = Val.cmpu_bool (Mem.valid_pointer m) Cne (valu x) (Vint Int.zero).

Lemma combine_compimm_eq_0_sound:
  forall x cond args,
  combine_compimm_eq_0 get x = Some(cond, args) ->
  eval_condition cond (map valu args) m = Val.cmp_bool Ceq (valu x) (Vint Int.zero) /\
  eval_condition cond (map valu args) m = Val.cmpu_bool (Mem.valid_pointer m) Ceq (valu x) (Vint Int.zero).

Lemma combine_compimm_eq_1_sound:
  forall x cond args,
  combine_compimm_eq_1 get x = Some(cond, args) ->
  eval_condition cond (map valu args) m = Val.cmp_bool Ceq (valu x) (Vint Int.one) /\
  eval_condition cond (map valu args) m = Val.cmpu_bool (Mem.valid_pointer m) Ceq (valu x) (Vint Int.one).

Lemma combine_compimm_ne_1_sound:
  forall x cond args,
  combine_compimm_ne_1 get x = Some(cond, args) ->
  eval_condition cond (map valu args) m = Val.cmp_bool Cne (valu x) (Vint Int.one) /\
  eval_condition cond (map valu args) m = Val.cmpu_bool (Mem.valid_pointer m) Cne (valu x) (Vint Int.one).

Theorem combine_cond_sound:
  forall cond args cond' args',
  combine_cond get cond args = Some(cond', args') ->
  eval_condition cond' (map valu args') m = eval_condition cond (map valu args) m.

Theorem combine_addr_32_sound:
  forall addr args addr' args',
  combine_addr_32 get addr args = Some(addr', args') ->
  eval_addressing32 ge sp addr' (map valu args') = eval_addressing32 ge sp addr (map valu args).

Theorem combine_addr_64_sound:
  forall addr args addr' args',
  combine_addr_64 get addr args = Some(addr', args') ->
  eval_addressing64 ge sp addr' (map valu args') = eval_addressing64 ge sp addr (map valu args).

Theorem combine_addr_sound:
  forall addr args addr' args',
  combine_addr get addr args = Some(addr', args') ->
  eval_addressing ge sp addr' (map valu args') = eval_addressing ge sp addr (map valu args).

Theorem combine_op_sound:
  forall op args op' args',
  combine_op get op args = Some(op', args') ->
  eval_operation ge sp op' (map valu args') m = eval_operation ge sp op (map valu args) m.

End COMBINE.