diff --git a/compiler/heptagon/analysis/causality.ml b/compiler/heptagon/analysis/causality.ml
index 3599e9e..f498aa6 100644
--- a/compiler/heptagon/analysis/causality.ml
+++ b/compiler/heptagon/analysis/causality.ml
@@ -42,11 +42,15 @@ let cand c1 c2 =
   match c1, c2 with
     | Cempty, _ -> c2 | _, Cempty -> c1
     | c1, c2 -> Cand(c1, c2)
-let rec candlist l =
+let candlist l =
+  let rec candlist_aux acc l =
+    match l with
+    | [] -> acc
+    | [c] -> cand acc c
+    | c1 :: l -> candlist_aux (cand c1 acc) l in
   match l with
-    | [] -> Cempty
-    | [c] -> c
-    | c1 :: l -> cand c1 (candlist l)
+  | [] -> Cempty
+  | c :: l -> candlist_aux c l
 
 let ctuplelist l = match l with
   | [c] -> c
@@ -185,7 +189,7 @@ let rec typing_pat = function
       candlist (List.map typing_pat pat_list)
 
 (** Typing equations *)
-let rec typing_eqs eq_list = candlist (List.map typing_eq eq_list)
+let rec typing_eqs eq_list = candlist (List.rev_map typing_eq eq_list)
 
 and typing_eq eq =
   match eq.eq_desc with
diff --git a/compiler/heptagon/parsing/hept_scoping.ml b/compiler/heptagon/parsing/hept_scoping.ml
index a9c8e1a..d4c5302 100644
--- a/compiler/heptagon/parsing/hept_scoping.ml
+++ b/compiler/heptagon/parsing/hept_scoping.ml
@@ -403,7 +403,7 @@ and translate_eq_desc loc env = function
 and translate_block env b =
   let env = Rename.append env b.b_local in
   { Heptagon.b_local = translate_vd_list env b.b_local;
-    Heptagon.b_equs = List.map (translate_eq env) b.b_equs;
+    Heptagon.b_equs = List.rev_map (translate_eq env) b.b_equs;
     Heptagon.b_defnames = Env.empty;
     Heptagon.b_stateful = false;
     Heptagon.b_loc = b.b_loc; }, env
@@ -442,8 +442,8 @@ and translate_var_dec env vd =
       Heptagon.v_loc = vd.v_loc }
 
 (** [env] should contain the declared variables prior to this translation *)
-and translate_vd_list env =
-  List.map (translate_var_dec env)
+and translate_vd_list env v_list =
+  List.rev (List.rev_map (translate_var_dec env) v_list)
 
 and translate_last = function
   | Var -> Heptagon.Var
diff --git a/compiler/heptagon/transformations/completion.ml b/compiler/heptagon/transformations/completion.ml
index 99624cc..b28d000 100644
--- a/compiler/heptagon/transformations/completion.ml
+++ b/compiler/heptagon/transformations/completion.ml
@@ -74,8 +74,8 @@ let complete_with_last defined_names local_defined_names eq_list =
 
 let block funs defnames b =
   let b, _ = Hept_mapfold.block funs Env.empty b in (*recursive call*)
-  let added_eq = complete_with_last defnames b.b_defnames [] in
-  { b with b_equs = b.b_equs @ added_eq; b_defnames = defnames }
+  let eqs = complete_with_last defnames b.b_defnames b.b_equs in
+  { b with b_equs = eqs; b_defnames = defnames }
   , defnames
 
 let eqdesc funs _ ed = match ed with
diff --git a/compiler/heptagon/transformations/last.ml b/compiler/heptagon/transformations/last.ml
index 0b1ae8d..5589089 100644
--- a/compiler/heptagon/transformations/last.ml
+++ b/compiler/heptagon/transformations/last.ml
@@ -52,7 +52,8 @@ let last (eq_list, env, v) { v_ident = n; v_type = t; v_linearity = lin; v_last
         Env.add n lastn env,
         (mk_var_dec lastn t ~linearity:lin) :: v
 
-let extend_env env v = List.fold_left last ([], env, []) v
+let extend_env env eq_list acc_vd vd_list =
+  List.fold_left last (eq_list, env, acc_vd) vd_list
 
 let edesc _ env ed = match ed with
   | Elast x ->
@@ -60,19 +61,21 @@ let edesc _ env ed = match ed with
   | _ -> raise Errors.Fallback
 
 let block funs env b =
-  let eq_lastn_n_list, env, last_v = extend_env env b.b_local in
+  let eq_list, env, vd_list = extend_env env b.b_equs b.b_local b.b_local in
   let b, _ = Hept_mapfold.block funs env b in
-    { b with b_local = b.b_local @ last_v;
-        b_equs = eq_lastn_n_list @ b.b_equs }, env
+    { b with b_local = vd_list;
+             b_equs = eq_list },
+    env
 
 let node_dec funs _ n =
   Idents.enter_node n.n_name;
-  let _, env, _ = extend_env Env.empty n.n_input in
-  let eq_lasto_list, env, last_o = extend_env env n.n_output in
+  let { n_block } = n in
+  let _, env, _ = extend_env Env.empty [] [] n.n_input in
+  let eq_list, env, vd_list = extend_env env n_block.b_equs n_block.b_local n.n_output in
   let n, _  = Hept_mapfold.node_dec funs env n in
     { n with n_block =
-        { n.n_block with b_local = n.n_block.b_local @ last_o;
-            b_equs = eq_lasto_list @ n.n_block.b_equs } }, env
+        { n_block with b_local = vd_list;
+                       b_equs = eq_list } }, env
 
 let program p =
   let funs = { Hept_mapfold.defaults with
diff --git a/compiler/main/hept2mls.ml b/compiler/main/hept2mls.ml
index d848f53..7692881 100644
--- a/compiler/main/hept2mls.ml
+++ b/compiler/main/hept2mls.ml
@@ -209,8 +209,8 @@ let translate_contract contract =
              Heptagon.c_assume_loc = e_a_loc;
              Heptagon.c_enforce_loc = e_g_loc;
              Heptagon.c_controllables = l_c } ->
-        Some { c_local = List.map translate_var v;
-               c_eq = List.map translate_eq eq_list;
+        Some { c_local = List.rev_map translate_var v;
+               c_eq = List.rev_map translate_eq eq_list;
                c_assume = translate_extvalue e_a;
                c_objectives = List.map translate_objective objs;
                c_assume_loc = translate_extvalue e_a_loc;
@@ -225,8 +225,8 @@ let node n =
     n_input = List.map translate_var n.Heptagon.n_input;
     n_output = List.map translate_var n.Heptagon.n_output;
     n_contract = translate_contract n.Heptagon.n_contract;
-    n_local = List.map translate_var n.Heptagon.n_block.Heptagon.b_local;
-    n_equs = List.map translate_eq n.Heptagon.n_block.Heptagon.b_equs;
+    n_local = List.rev_map translate_var n.Heptagon.n_block.Heptagon.b_local;
+    n_equs = List.rev_map translate_eq n.Heptagon.n_block.Heptagon.b_equs;
     n_loc = n.Heptagon.n_loc ;
     n_params = n.Heptagon.n_params;
     n_param_constraints = n.Heptagon.n_param_constraints;
diff --git a/compiler/main/mls2obc.ml b/compiler/main/mls2obc.ml
index 2a22c43..7abba2e 100644
--- a/compiler/main/mls2obc.ml
+++ b/compiler/main/mls2obc.ml
@@ -234,7 +234,7 @@ let translate_var_dec l =
   let one_var { Minils.v_ident = x; Minils.v_type = t; Minils.v_linearity = lin; v_loc = loc } =
     mk_var_dec ~loc:loc ~linearity:lin x t
   in
-  List.map one_var l
+  List.rev (List.rev_map one_var l)
 
 let rec translate_extvalue map w = match w.Minils.w_desc with
   | Minils.Wvar x -> ext_value_of_pattern (var_from_name map x)
@@ -452,12 +452,12 @@ let empty_call_context = None
     [s] the actions used in the step method.
     [v] var decs *)
 let rec translate_eq map call_context
-    ({ Minils.eq_lhs = pat; Minils.eq_base_ck = ck; Minils.eq_rhs = e } as eq)
-    (v, si, j, s) =
+    (v, si, j, s)
+    ({ Minils.eq_lhs = pat; Minils.eq_base_ck = ck; Minils.eq_rhs = e } as eq) =
   let { Minils.e_desc = desc; Minils.e_loc = loc } = e in
   match (pat, desc) with
     | _pat, Minils.Ewhen (e,_,_) ->
-        translate_eq map call_context {eq with Minils.eq_rhs = e} (v, si, j, s)
+        translate_eq map call_context (v, si, j, s) {eq with Minils.eq_rhs = e}
     (* TODO Efby and Eifthenelse should be dealt with in translate_act, no ? *)
     | Minils.Evarpat n, Minils.Efby (opt_c, e) ->
         let x = var_from_name map n in
@@ -529,7 +529,8 @@ let rec translate_eq map call_context
           v, si, j, action @ s
 
 and translate_eq_list map call_context act_list =
-  List.fold_right (translate_eq map call_context) act_list ([], [], [], [])
+  let rev_act = List.rev act_list in
+  List.fold_left (translate_eq map call_context) ([], [], [], []) rev_act
 
 and mk_node_call map call_context app loc (name_list : Obc.pattern list) args ty =
   match app.Minils.a_op with
@@ -734,17 +735,17 @@ let translate_node
   let (m_c, si', j', s_list', d_list') = translate_contract subst_map mem_var_tys contract in
   let i_list = translate_var_dec i_list in
   let o_list = translate_var_dec o_list in
-  let d_list = translate_var_dec (v @ d_list) in
+  let d_list = translate_var_dec (List.rev_append v d_list) in
   let m, d_list = List.partition
     (fun vd -> List.exists (fun (i,_) -> i = vd.v_ident) mem_var_tys) d_list in
   let m', o_list =
     List.partition
       (fun vd -> List.exists (fun (i,_) -> i = vd.v_ident) mem_var_tys) o_list in
-  let s = s_list @ s_list' in
+  let s = List.rev_append (List.rev s_list) s_list' in
   let j = j' @ j in
   let si = si @ si' in
   let stepm = { m_name = Mstep; m_inputs = i_list; m_outputs = o_list;
-                m_body = mk_block ~locals:(d_list' @ d_list) s }
+                m_body = mk_block ~locals:(List.rev_append d_list' d_list) s }
   in
   let resetm = { m_name = Mreset; m_inputs = []; m_outputs = []; m_body = mk_block si } in
   if stateful
diff --git a/compiler/minils/analysis/clocking.ml b/compiler/minils/analysis/clocking.ml
index 1761605..da7537b 100644
--- a/compiler/minils/analysis/clocking.ml
+++ b/compiler/minils/analysis/clocking.ml
@@ -249,7 +249,7 @@ let typing_eq h ({ eq_lhs = pat; eq_rhs = e; eq_loc = loc } as eq) =
       error_message loc (Etypeclash (ct, pat_ct)));
   { eq with eq_base_ck = base_ck }
 
-let typing_eqs h eq_list = List.map (typing_eq h) eq_list
+let typing_eqs h eq_list = List.rev_map (typing_eq h) eq_list
 
 let append_env h vds =
   List.fold_left (fun h { v_ident = n; v_clock = ck } -> Env.add n ck h) h vds
@@ -290,7 +290,7 @@ let typing_node node =
   let set_clock vd = { vd with v_clock = ck_repr (Env.find vd.v_ident h) } in
   let node = { node with n_input = List.map set_clock node.n_input;
                          n_output = List.map set_clock node.n_output;
-                         n_local = List.map set_clock node.n_local;
+                         n_local = List.rev_map set_clock node.n_local;
                          n_equs = equs;
                          n_contract = contract; }
   in
diff --git a/compiler/minils/transformations/normalize_mem.ml b/compiler/minils/transformations/normalize_mem.ml
index c5f2baf..1feefec 100644
--- a/compiler/minils/transformations/normalize_mem.ml
+++ b/compiler/minils/transformations/normalize_mem.ml
@@ -107,10 +107,10 @@ let contract _ acc c = c, acc
 let node funs acc nd =
   let env = build_env nd in
   let nd, (_, _, v, eqs) =
-    Mls_mapfold.node_dec funs (env, nd.n_local @ nd.n_output, [], []) nd
+    Mls_mapfold.node_dec funs (env, nd.n_output @ nd.n_local, nd.n_local, []) nd
   in
   (* return updated node *)
-  { nd with n_local = v @ nd.n_local; n_equs = List.rev eqs }, acc
+  { nd with n_local = v; n_equs = List.rev eqs }, acc
 
 let program p =
   let funs = { Mls_mapfold.defaults with
diff --git a/compiler/obc/control.ml b/compiler/obc/control.ml
index 1ec2639..613344f 100644
--- a/compiler/obc/control.ml
+++ b/compiler/obc/control.ml
@@ -113,31 +113,31 @@ let is_deadcode = function (* TODO Etrange puisque c'est apres la passe de deadc
     | _ -> false
 
 let rec joinlist j l =
-  let rec join_next l =
+  let rec join_next acc l =
     match l with
-      | [] -> []
-      | [s1] -> [s1]
+      | [] -> acc
+      | [s1] -> s1::acc
       | s1::s2::l ->
           match s1, s2 with
             | Acase(e1, h1),
               Acase(e2, h2) when Obc_compare.exp_compare e1 e2 = 0 ->
                 let fused_switch = Acase(e1, joinhandlers j h1 h2) in
                 if is_modified_handlers j e2 h1 then
-                  fused_switch::(join_first l)
+                  join_first (fused_switch::acc) l
                 else
-                  join_next (fused_switch::l)
-            | s1, s2 -> s1::(join_first (s2::l))
-  and join_first l =
+                  join_next acc (fused_switch::l)
+            | s1, s2 -> join_first (s1::acc) (s2::l)
+  and join_first acc l =
     match l with
-      | [] -> []
+      | [] -> acc
       | (Acase(e1, h1))::l ->
           if is_modified_handlers j e1 h1 then
-            (Acase(e1, h1))::(join_next l)
+            join_next ((Acase(e1, h1))::acc) l
           else
-            join_next ((Acase(e1, h1))::l)
-      | _ -> join_next l
+            join_next acc ((Acase(e1, h1))::l)
+      | _ -> join_next acc l
   in
-    join_first l
+  List.rev (join_first [] l)
 
 
 and join_block j b =