diff --git a/compiler/main/mls2obc.ml b/compiler/main/mls2obc.ml
index 007315b..b8d5f17 100644
--- a/compiler/main/mls2obc.ml
+++ b/compiler/main/mls2obc.ml
@@ -599,6 +599,7 @@ let translate_node
     ({ Minils.n_name = f; Minils.n_input = i_list; Minils.n_output = o_list;
       Minils.n_local = d_list; Minils.n_equs = eq_list; Minils.n_stateful = stateful;
       Minils.n_contract = contract; Minils.n_params = params; Minils.n_loc = loc;
+      Minils.n_mem_alloc = mem_alloc
     } as n) =
   Idents.enter_node f;
   let mem_var_tys = Mls_utils.node_memory_vars n in
@@ -619,12 +620,12 @@ let translate_node
   let resetm = { m_name = Mreset; m_inputs = []; m_outputs = []; m_body = mk_block si } in
   if stateful
   then { cd_name = f; cd_stateful = true; cd_mems = m; cd_params = params;
-         cd_objs = j; cd_methods = [stepm; resetm]; cd_loc = loc; }
+         cd_objs = j; cd_methods = [stepm; resetm]; cd_loc = loc; cd_mem_alloc = mem_alloc }
   else (
     (* Functions won't have [Mreset] or memories,
        they still have [params] and instances (of functions) *)
     { cd_name = f; cd_stateful = false; cd_mems = []; cd_params = params;
-      cd_objs = j; cd_methods = [stepm]; cd_loc = loc; }
+      cd_objs = j; cd_methods = [stepm]; cd_loc = loc; cd_mem_alloc = mem_alloc }
   )
 
 let translate_ty_def { Minils.t_name = name; Minils.t_desc = tdesc;
diff --git a/compiler/minils/analysis/interference.ml b/compiler/minils/analysis/interference.ml
index 92145a1..5bddce8 100644
--- a/compiler/minils/analysis/interference.ml
+++ b/compiler/minils/analysis/interference.ml
@@ -98,7 +98,9 @@ module World = struct
         let vd = vd_from_ident x in
           vd.v_type
     | Ifield(_, f) ->
-        Tid (Modules.find_field f)
+        let n = Modules.find_field f in
+        let fields = Modules.find_struct n in
+          Signature.field_assoc f fields
 
   let is_optimized_ty ty =
     match Modules.unalias_type ty with
diff --git a/compiler/obc/main/obc_compiler.ml b/compiler/obc/main/obc_compiler.ml
index 686e3c7..333c3c0 100644
--- a/compiler/obc/main/obc_compiler.ml
+++ b/compiler/obc/main/obc_compiler.ml
@@ -16,4 +16,8 @@ let pp p = if !verbose then Obc_printer.print stdout p
 let compile_program p =
   (*Control optimization*)
   let p = pass "Control optimization" true Control.program p pp in
+
+  (* Memory allocation application *)
+  let p = pass "Application of Memory Allocation" !do_mem_alloc Memalloc_apply.program p pp in
+
   p
diff --git a/compiler/obc/obc.ml b/compiler/obc/obc.ml
index d532dd0..24ebcf8 100644
--- a/compiler/obc/obc.ml
+++ b/compiler/obc/obc.ml
@@ -106,7 +106,8 @@ type class_def =
       cd_objs  : obj_dec list;
       cd_params : param list;
       cd_methods: method_def list;
-      cd_loc : location }
+      cd_loc : location;
+      cd_mem_alloc : (ty * Interference_graph.ivar list) list; }
 
 
 type program =
diff --git a/compiler/obc/transformations/memalloc_apply.ml b/compiler/obc/transformations/memalloc_apply.ml
new file mode 100644
index 0000000..c3b9d0e
--- /dev/null
+++ b/compiler/obc/transformations/memalloc_apply.ml
@@ -0,0 +1,126 @@
+open Types
+open Idents
+open Obc
+open Obc_utils
+open Obc_mapfold
+open Interference_graph
+
+let rec ivar_of_pat l = match l.pat_desc with
+  | Lvar x -> Ivar x
+  | Lfield(l, f) -> Ifield (ivar_of_pat l, f)
+  | _ -> assert false
+
+let rec repr_from_ivar env iv =
+  try
+    let lhs = IvarEnv.find iv env in lhs.pat_desc
+  with
+    | Not_found ->
+        (match iv with
+          | Ivar x -> Lvar x
+          | Ifield(iv, f) ->
+              let ty = Tid (Modules.find_field f) in
+              let lhs = mk_pattern ty (repr_from_ivar env iv) in
+                Lfield (lhs, f) )
+
+let rec choose_record_field env l = match l with
+  | [iv] -> repr_from_ivar env iv
+  | (Ivar _)::l -> choose_record_field env l
+  | (Ifield(iv,f))::_ -> repr_from_ivar env (Ifield(iv,f))
+  | [] -> assert false
+
+(** Chooses from a list of vars (with the same color in the interference graph)
+    the one that will be used to store every other. It can be either an input,
+    an output or any var if there is no input or output in the list. *)
+let choose_representative m inputs outputs mems ty vars =
+  let filter_ivs vars l = List.filter (fun iv -> List.mem iv l) vars in
+  let inputs = filter_ivs vars inputs in
+  let outputs = filter_ivs vars outputs in
+  let mems = filter_ivs vars mems in
+  let desc = match inputs, outputs, mems with
+      | [], [], [] -> choose_record_field m vars
+      | [], [], (Ivar m)::_ -> Lmem m
+      | [Ivar vin], [], [] -> Lvar vin
+      | [], [Ivar vout], [] -> Lvar vout
+      | [Ivar vin], [Ivar _], [] -> Lvar vin
+      | _, _, _ ->
+      (*  Format.printf "Something is wrong with the coloring : ";
+        List.iter (fun vd -> Format.printf "%s," (ivar_to_string vd)) vars;
+        Format.printf "\n Inputs : ";
+        List.iter (fun vd -> Format.printf "%s," (ivar_to_string vd)) inputs;
+        Format.printf "\n Outputs : ";
+        List.iter (fun vd -> Format.printf "%s," (ivar_to_string vd)) outputs;
+        Format.printf "\n Mem : ";
+        List.iter (fun vd -> Format.printf "%s," (ivar_to_string vd)) mems;
+        Format.printf "\n"; *)
+        assert false (*something went wrong in the coloring*)
+  in
+    mk_pattern ty desc
+
+let memalloc_subst_map inputs outputs mems subst_lists =
+  let map_from_subst_lists (env, mutables) l =
+    let add_to_map (env, mutables) (ty, l) =
+      let repr = choose_representative env inputs outputs mems ty l in
+      let env = List.fold_left (fun env iv -> IvarEnv.add iv repr env) env l in
+      let mutables =
+        if (List.length l > 2) || (List.mem (Ivar (var_name repr)) mems) then
+          IdentSet.add (var_name repr) mutables
+        else
+          mutables
+      in
+        env, mutables
+    in
+      List.fold_left add_to_map (env, mutables) l
+  in
+  let record_lists, other_lists = List.partition
+    (fun (ty,_) -> Interference.is_record_type ty) subst_lists in
+  let env, mutables = map_from_subst_lists (IvarEnv.empty, IdentSet.empty) record_lists in
+    map_from_subst_lists (env, mutables) other_lists
+
+
+let lhs funs (env, mut) l = match l.pat_desc with
+  | Lmem _ -> l, (env, mut)
+  | Larray _ -> Obc_mapfold.lhs funs (env, mut) l
+  | Lvar _ | Lfield _ ->
+      (* replace with representative *)
+      let iv = ivar_of_pat l in
+        try
+          IvarEnv.find iv env, (env, mut)
+        with
+          | Not_found -> l, (env, mut)
+
+let act _ acc a = match a with
+  | Acall(_, _, Mstep, _) ->
+      (* remove targeted outputs *) a, acc
+  | _ -> raise Errors.Fallback
+
+let var_decs _ (env, mutables) vds =
+  let var_dec vd acc =
+    try
+      if (var_name (IvarEnv.find (Ivar vd.v_ident) env)) <> vd.v_ident then
+        (* remove unnecessary outputs *)
+        acc
+      else (
+        let vd = if IdentSet.mem vd.v_ident mutables then { vd with v_mutable = true } else vd in
+          vd::acc
+      )
+    with
+      | Not_found -> vd::acc
+  in
+    List.fold_right var_dec vds [], (env, mutables)
+
+let class_def funs acc cd =
+  (* find the substitution and apply it to the body of the class *)
+  let ivars_of_vds vds = List.map (fun vd -> Ivar vd.v_ident) vds in
+  let md = find_step_method cd in
+  let inputs = ivars_of_vds md.m_inputs in
+  let outputs = ivars_of_vds md.m_outputs in
+  let mems = ivars_of_vds cd.cd_mems in
+  let env, mutables = memalloc_subst_map inputs outputs mems cd.cd_mem_alloc in
+  let cd, _ = Obc_mapfold.class_def funs (env, mutables) cd in
+    cd, acc
+
+let program p =
+  let funs = { Obc_mapfold.defaults with class_def = class_def; var_decs = var_decs;
+    act = act; lhs = lhs } in
+  let p, _ = Obc_mapfold.program_it funs (IvarEnv.empty, IdentSet.empty) p in
+    p