diff --git a/.gitignore b/.gitignore
deleted file mode 100644
index a28eac24..00000000
--- a/.gitignore
+++ /dev/null
@@ -1,5 +0,0 @@
-/Driver
-/Driver.cmi
-/Driver.cmo
-/Expr.cmi
-/Expr.cmo
diff --git a/.travis-opam.sh b/.travis-opam.sh
new file mode 100644
index 00000000..c4399c7d
--- /dev/null
+++ b/.travis-opam.sh
@@ -0,0 +1,37 @@
+echo -en "travis_fold:start:prepare.ci\r"
+# If a fork of these scripts is specified, use that GitHub user instead
+fork_user=${FORK_USER:-ocaml}
+
+# If a branch of these scripts is specified, use that branch instead of 'master'
+fork_branch=${FORK_BRANCH:-master}
+
+### Bootstrap
+
+set -uex
+
+get() {
+  wget https://raw.githubusercontent.com/${fork_user}/ocaml-ci-scripts/${fork_branch}/$@
+}
+
+TMP_BUILD=$(mktemp -d 2>/dev/null || mktemp -d -t 'citmpdir')
+cd ${TMP_BUILD}
+
+get .travis-ocaml.sh
+get yorick.mli
+get yorick.ml
+get ci_opam.ml
+
+sh .travis-ocaml.sh
+export OPAMYES=1
+eval $(opam config env)
+
+# This could be removed with some OPAM variable plumbing into build commands
+opam install ocamlfind
+
+ocamlc.opt yorick.mli
+ocamlfind ocamlc -c yorick.ml
+
+ocamlfind ocamlc -o ci-opam -package unix -linkpkg yorick.cmo ci_opam.ml
+cd -
+
+echo -en "travis_fold:end:prepare.ci\r"
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 00000000..b8a584d9
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,9 @@
+language: c 
+sudo: required 
+script:
+  - bash -ex .travis-opam.sh
+  - ./installBuildRun.sh
+env:
+  - OCAML_VERSION=4.04
+os:
+  - linux
diff --git a/installBuildRun.sh b/installBuildRun.sh
new file mode 100755
index 00000000..70dfbfb8
--- /dev/null
+++ b/installBuildRun.sh
@@ -0,0 +1,14 @@
+opam pin add GT https://github.com/Kakadu/GT.git -n -y
+opam pin add ostap https://github.com/dboulytchev/ostap.git -n -y
+opam install camlp5 -y
+opam install GT ostap ocamlfind -y
+eval `opam config env`
+sudo apt-get install gcc-multilib -y
+
+make
+
+cd regression
+make
+
+cd deep-expressions
+make
diff --git a/regression/Makefile b/regression/Makefile
index bbecbbd4..27a27d10 100644
--- a/regression/Makefile
+++ b/regression/Makefile
@@ -1,6 +1,6 @@
-TESTS=test001 test002 test012 test013 test003 test004 test005 test006 test007 test008 test009 test010 test011 test014 test015 test016 test017 test018 
+TESTS=test001 test002 test012 test013 test003 test004 test005 test006 test007 test008 test009 test010 test014 test015 test016 test017 test018 test019 test020 test021 test022 test023
 
-# test019 test020 test021 test022 test023 test024 test025 test026 
+# test011   test024 test025 test026 
 # test027 test028 test029 test030 
 
 .PHONY: check $(TESTS) 
diff --git a/src/Driver.ml b/src/Driver.ml
index 5c8e0b34..912cb75d 100644
--- a/src/Driver.ml
+++ b/src/Driver.ml
@@ -8,7 +8,7 @@ let parse filename =
   Util.parse 
     (object 
        inherit Matcher.t s 
-       inherit Util.Lexers.ident ["read"; "write"; "skip"] s
+       inherit Util.Lexers.ident ["read"; "write"; "skip"; "if"; "fi"; "then"; "else"; "while"; "do"; "od"; "repeat"; "until"; "for"] s
        inherit Util.Lexers.decimal s
        inherit Util.Lexers.skip [
          Matcher.Skip.whitespaces " \t\n";
diff --git a/src/Interpret.ml b/src/Interpret.ml
index 9f863d55..1cd543ad 100644
--- a/src/Interpret.ml
+++ b/src/Interpret.ml
@@ -1,49 +1,52 @@
-open Language
-
-(* Interpreter for expressions *)
-module Expr =
-  struct
-
-    open Expr
-
-    let rec eval expr st = 
-      let eval' e = eval e st in
-      match expr with
-      | Var   x     -> st x
-      | Const z     -> z
-      | Add  (x, y) -> eval' x + eval' y
-      | Mul  (x, y) -> eval' x * eval' y
-
-  end
-
-(* Interpreter for statements *)
-module Stmt =
-  struct
-
-    open Stmt
-
-    (* State update primitive *) 
-    let update st x v = fun y -> if y = x then v else st y 
-      
-    let rec eval stmt ((st, input, output) as conf) =
-      match stmt with
-      | Skip          -> conf
-      | Assign (x, e) -> (update st x (Expr.eval e st), input, output)
-      | Read    x     -> 
-	  let z :: input' = input in 
-          (update st x z, input', output)
-      | Write   e     -> (st, input, output @ [Expr.eval e st])
-      | Seq (s1, s2)  -> eval s1 conf |> eval s2 
-
-  end
-
-module Program =
-  struct
-
-    let eval p input = 
-      let (_, _, output) = 
-	Stmt.eval p ((fun _ -> failwith "undefined variable"), input, []) 
-      in
-      output
-
-  end
+open Language
+
+(* Interpreter for expressions *)
+module Expr =
+  struct
+
+    open Expr
+    open Language.BinOp
+
+    let rec eval expr st = 
+      let eval' e = eval e st in
+      match expr with
+      | Var   x     -> st x
+      | Const z     -> z
+      | Binop  (op, x, y) -> (apply op) (eval' x) (eval' y)
+
+  end
+
+(* Interpreter for statements *)
+module Stmt =
+  struct
+
+    open Stmt
+
+    (* State update primitive *) 
+    let update st x v = fun y -> if y = x then v else st y 
+      
+    let rec eval stmt ((st, input, output) as conf) =
+      match stmt with
+      | Skip          -> conf
+      | Assign (x, e) -> (update st x (Expr.eval e st), input, output)
+      | Write   e     -> (st, input, output @ [Expr.eval e st])
+      | Seq (s1, s2)  -> eval s1 conf |> eval s2 
+      | Read    x     -> 
+	  let z :: input' = input in
+	  (update st x z, input', output)
+      | If (e, s1, s2) -> if (Expr.eval e st) <> 0 then (eval s1 conf) else (eval s2 conf)
+      (*eval self again but with new conf (which is eval'ed body of while')*)
+      | While (e, s)   -> if (Expr.eval e st) <> 0 then eval stmt (eval s conf) else conf
+
+  end
+
+module Program =
+  struct
+
+    let eval p input = 
+      let (_, _, output) = 
+	Stmt.eval p ((fun _ -> failwith "undefined variable"), input, []) 
+      in
+      output
+
+  end
diff --git a/src/Language.ml b/src/Language.ml
index 96ac3e01..93bfdae1 100644
--- a/src/Language.ml
+++ b/src/Language.ml
@@ -1,20 +1,52 @@
-(* AST for expressions *)
+open Ostap 
+open Matcher
+
 module Expr =
   struct
 
     type t =
     | Var   of string
     | Const of int
-    | Add   of t * t
-    | Mul   of t * t 
+    | Binop of string * t * t
 
     ostap (
-      parse: x:mull "+" y:parse {Add (x,y)} | mull;
-      mull : x:prim "*" y:mull  {Mul (x,y)} | prim; 
-      prim : 
-        n:DECIMAL       {Const n}  
-      | e:IDENT         {Var e}
-      | -"(" parse -")" 
+      parse:
+        orins;
+
+      orins:
+        l:andins suf:(("!!") andins)* {
+           List.fold_left (fun l (op, r) -> Binop (Token.repr op, l, r)) l suf
+        }
+      | andins;
+
+      andins:
+        l:cmp suf:(("&&") cmp)* {
+           List.fold_left (fun l (op, r) -> Binop (Token.repr op, l, r)) l suf
+        }
+      | cmp;
+
+      cmp:
+        l:add suf:(("<=" | "<" | ">=" | ">" | "==" | "!=") add)* {
+           List.fold_left (fun l (op, r) -> Binop (Token.repr op, l, r)) l suf
+        }
+      | add;
+      
+      add:
+        l:mull suf:(("+" | "-") mull)* {
+          List.fold_left (fun l (op, r) -> Binop (Token.repr op, l, r)) l suf
+        }
+      | mull;
+
+      mull:
+        l:prim suf:(("*" | "/" | "%") prim)* {
+           List.fold_left (fun l (op, r) -> Binop (Token.repr op, l, r)) l suf
+        }
+      | prim;
+
+      prim:
+        n:DECIMAL {Const n}
+      | x:IDENT   {Var   x}
+      | -"(" parse -")"
     )
 
   end
@@ -29,6 +61,9 @@ module Stmt =
     | Read   of string
     | Write  of Expr.t
     | Seq    of t * t
+    | If     of Expr.t * t * t
+    | While  of Expr.t * t
+    | Repeat of t * Expr.t
 
     let expr = Expr.parse
 
@@ -36,13 +71,49 @@ module Stmt =
       simp: x:IDENT ":=" e:expr  {Assign (x, e)}
       | %"read"  "(" x:IDENT ")" {Read x}
       | %"write" "(" e:expr  ")" {Write e}
-      | %"skip"                  {Skip};
-      
+      | %"skip"                  {Skip}
+      | %"if"        e:!(Expr.parse)
+        %"then"      s1:!(parse)
+        %"else"      s2:!(parse)
+        %"fi"                            {If (e, s1, s2)}
+      | %"if"        e:!(Expr.parse)
+        %"then"      s1:!(parse)
+        %"fi"                            {If (e, s1, Skip)}
+      | %"while"     e:!(Expr.parse)
+        %"do"        s:!(parse)
+        %"od"                            {While (e, s)}
+      | %"repeat"    s:!(parse)
+        %"until"     e:!(Expr.parse)     {Seq (s, While (Binop ("==", e, Const 0), s))}
+      | %"for"       i:!(parse) "," n:!(Expr.parse) "," b:!(parse)
+        %"do"        a:!(parse)
+        %"od"                            {Seq (i, (While (n, Seq (a, b))))};
       parse: s:simp ";" d:parse {Seq (s,d)} | simp 
     )
 
   end
 
+
+module BinOp = 
+    struct
+
+    let apply op =
+      match op with
+      | "+"  -> fun x y -> x + y
+      | "*"  -> fun x y -> x * y
+      | "-"  -> fun x y -> x - y
+      | "/"  -> fun x y -> x / y
+      | "%"  -> fun x y -> x mod y
+      | "<"  -> fun x y -> if x < y then 1 else 0
+      | "<=" -> fun x y -> if x <= y then 1 else 0
+      | ">"  -> fun x y -> if x > y then 1 else 0
+      | ">=" -> fun x y -> if x >= y then 1 else 0
+      | "==" -> fun x y -> if x = y then 1 else 0
+      | "!=" -> fun x y -> if x <> y then 1 else 0
+      | "&&" -> fun x y -> if (x <> 0) && (y <> 0) then 1 else 0
+      | "!!" -> fun x y -> if (x <> 0) || (y <> 0) then 1 else 0
+    
+  end
+
 module Program =
   struct
 
diff --git a/src/StackMachine.ml b/src/StackMachine.ml
index 870537a4..aa0b0744 100644
--- a/src/StackMachine.ml
+++ b/src/StackMachine.ml
@@ -8,8 +8,10 @@ module Instr =
       | PUSH of int
       | LD   of string
       | ST   of string
-      | ADD  
-      | MUL
+      | BINOP of string
+      | GOTO   of string
+      | IFGOTO of string * string
+      | LABEL  of string
 
   end
 
@@ -25,36 +27,48 @@ module Interpret =
 
     open Instr
     open Interpret.Stmt
+    open Language.BinOp
+
+     let e_to_op = function
+      | "z"  -> (==)
+      | "nz" -> (!=)
+      | _    -> failwith "Stack machine.e_to_op: Unknown parameter"
+           
+    (* Get instruction pointer for label lbl in the code*)
+    let rec find_ip lbl code =
+      match code with
+      | [] -> failwith "Stack machine.Find ip: Unknown label"
+      | i::code' -> if i = LABEL lbl then 0 else  1 + find_ip lbl code'
 
     let run prg input =
-      let rec run' prg ((stack, st, input, output) as conf) =
-	match prg with
-	| []        -> conf
-	| i :: prg' ->
-            run' prg' (
+      let rec run' prg ((stack, st, input, output, ip) as conf) =
+        if ip >= (List.length prg)
+        then conf
+        else let i = (List.nth prg ip) in
+	      run' prg (
             match i with
             | READ  -> let z :: input' = input in
-              (z :: stack, st, input', output)
+              (z :: stack, st, input', output, ip + 1)
             | WRITE -> let z :: stack' = stack in
-              (stack', st, input, output @ [z])
-	    | PUSH n -> (n :: stack, st, input, output)
-            | LD   x -> (st x :: stack, st, input, output)
-	    | ST   x -> let z :: stack' = stack in
-              (stack', update st x z, input, output)
-	    | _ -> let y :: x :: stack' = stack in
-              ((match i with ADD -> (+) | _ -> ( * )) x y :: stack', 
-               st, 
-               input, 
-               output
-              )
-           )
+              (stack', st, input, output @ [z], ip + 1)
+	        | PUSH n -> (n :: stack, st, input, output, ip + 1)
+            | LD   x -> (st x :: stack, st, input, output, ip + 1)
+	        | ST   x -> let z :: stack' = stack in
+              (stack', update st x z, input, output, ip + 1)
+	        | BINOP op ->
+		      let y::x::stack' = stack in
+              ((apply op x y)::stack', st, input, output, ip + 1)
+            | LABEL lbl ->
+              (stack, st, input, output, ip + 1)
+            | GOTO  lbl ->
+              (stack, st, input, output, (find_ip lbl prg))
+            | IFGOTO (e, lbl) ->
+              let y::stack' = stack in
+               (stack', st, input, output, if ((e_to_op e) y 0) then (find_ip lbl prg) else ip + 1)
+        )
       in
-      let (_, _, _, output) = 
-	run' prg ([], 
-	          (fun _ -> failwith "undefined variable"),
-	          input,
-	          []
-	         ) 
+      let (_, _, _, output, _) = 
+	    run' prg ([], (fun _ -> failwith "undefined variable"), input, [], 0) 
       in
       output
   end
@@ -72,8 +86,7 @@ module Compile =
 	let rec compile = function 
 	| Var x      -> [LD   x]
 	| Const n    -> [PUSH n]
-	| Add (x, y) -> (compile x) @ (compile y) @ [ADD]
-	| Mul (x, y) -> (compile x) @ (compile y) @ [MUL]
+    | Binop (op, x, y) -> (compile x) @ (compile y) @ [BINOP op]
 
       end
 
@@ -82,12 +95,34 @@ module Compile =
 
 	open Language.Stmt
 
+    let i = ref (-1)
+    let create_new_lbl () =
+      i:= !i + 1;
+      string_of_int !i
+
 	let rec compile = function
 	| Skip          -> []
 	| Assign (x, e) -> Expr.compile e @ [ST x]
 	| Read    x     -> [READ; ST x]
 	| Write   e     -> Expr.compile e @ [WRITE]
 	| Seq    (l, r) -> compile l @ compile r
+    | If     (e, s1, s2) ->
+       let lbl1 = create_new_lbl () in
+       let lbl2 = create_new_lbl () in
+       Expr.compile e
+       @ [IFGOTO ("z", lbl1)]
+       @ compile s1
+       @ [GOTO lbl2; LABEL lbl1]
+       @ compile s2
+       @ [LABEL lbl2]
+    | While   (e, s)     ->
+       let lbl1 = create_new_lbl () in
+       let lbl2 = create_new_lbl () in
+       [GOTO lbl2; LABEL lbl1]
+       @ compile s
+       @ [LABEL lbl2]
+       @ Expr.compile e
+       @ [IFGOTO ("nz", lbl1)]
 
       end
 
diff --git a/src/X86.ml b/src/X86.ml
index 9f0544af..cc5f8333 100644
--- a/src/X86.ml
+++ b/src/X86.ml
@@ -6,16 +6,36 @@ type opnd = R of int | S of int | L of int | M of string
 let regs  = [|"%eax"; "%ebx"; "%ecx"; "%esi"; "%edi"; "%edx"; "%esp"; "%ebp"|]
 let nregs = Array.length regs - 3
 
+
 let [|eax; ebx; ecx; esi; edi; edx; esp; ebp|] = Array.mapi (fun i _ -> R i) regs
 
+
 type instr =
 | Add  of opnd * opnd
 | Mul  of opnd * opnd
+| Sub  of opnd * opnd
+| Div  of opnd * opnd
+| Mod  of opnd * opnd
 | Mov  of opnd * opnd
+| Cmp  of opnd * opnd
+| Xor  of opnd * opnd
+| Or   of opnd * opnd
+| And  of opnd * opnd
 | Push of opnd
 | Pop  of opnd
-| Call of string
+| Cdq
+| Setl
+| Setle
+| Setg
+| Setge
+| Sete
+| Setne
+| Movzbl
 | Ret
+| Call of string
+| Lbl    of string
+| Goto   of string
+| Ifgoto of string * string
 
 let to_string buf code =      
   let instr =
@@ -26,13 +46,40 @@ let to_string buf code =
       | M s -> s  
     in
     function
-      | Add (x, y) -> Printf.sprintf "addl\t%s,%s"  (opnd x) (opnd y)
-      | Mul (x, y) -> Printf.sprintf "imull\t%s,%s" (opnd x) (opnd y)
-      | Mov (x, y) -> Printf.sprintf "movl\t%s,%s"  (opnd x) (opnd y)
-      | Push x     -> Printf.sprintf "pushl\t%s"    (opnd x)
-      | Pop  x     -> Printf.sprintf "popl\t%s"     (opnd x)
-      | Call x     -> Printf.sprintf "call\t%s"      x
-      | Ret        -> "ret" 
+      | Add (s1, s2) -> Printf.sprintf "\taddl\t%s,\t%s"  (opnd s1) (opnd s2)
+      | Mul (s1, s2) -> Printf.sprintf "\timull\t%s,\t%s" (opnd s1) (opnd s2)
+      | Sub (s1, s2) -> Printf.sprintf "\tsubl\t%s,\t%s"  (opnd s1) (opnd s2)
+      | Div (s1, s2) -> Printf.sprintf "\tidivl\t%s"      (opnd s1)
+
+      | Mov (s1, s2) -> Printf.sprintf "\tmovl\t%s,\t%s"  (opnd s1) (opnd s2)
+      | Cmp (s1, s2) -> Printf.sprintf "\tcmp\t%s,\t%s"   (opnd s1) (opnd s2)
+      | Push s       -> Printf.sprintf "\tpushl\t%s"      (opnd s )
+      | Pop  s       -> Printf.sprintf "\tpopl\t%s"       (opnd s )
+ 
+      | Xor (s1, s2) -> Printf.sprintf "\txorl\t%s,\t%s"  (opnd s1) (opnd s2)
+      | Or  (s1, s2) -> Printf.sprintf "\torl\t%s,\t%s"   (opnd s1) (opnd s2)
+      | And (s1, s2) -> Printf.sprintf "\tandl\t%s,\t%s"  (opnd s1) (opnd s2)
+
+      (*выставляем байты если выполняются условия*)
+      | Setl         -> "\tsetl\t%al"
+      | Setle        -> "\tsetle\t%al"
+      | Setg         -> "\tsetg\t%al"
+      | Setge        -> "\tsetge\t%al"
+      | Sete         -> "\tsete\t%al"
+      | Setne        -> "\tsetne\t%al"
+    
+                               
+      (*в wrap_mem_access мы в y кладём edx, соотв. здесь al кладём в edx*)           
+      | Movzbl       -> "\tmovzbl\t%al,\t%edx" 
+      
+      (*делаем знаковое деление*)
+      | Cdq          -> "\tcdq"
+      | Ret          -> "\tret"
+      | Call p       -> Printf.sprintf "\tcall\t%s" p 
+
+      | Lbl s         -> Printf.sprintf "label%s:" s
+      | Goto s        -> Printf.sprintf "\tjmp\tlabel%s" s
+      | Ifgoto (e, s) -> Printf.sprintf "\tj%s\tlabel%s" e s
   in
   let out s = 
     Buffer.add_string buf "\t"; 
@@ -42,14 +89,23 @@ let to_string buf code =
   List.iter (fun i -> out @@ instr i) code
     
 module S = Set.Make (String)
-    
+
+let save_eax_edx f =
+  [Push eax; Push edx] @ f @ [Pop edx; Pop eax] 
+
+let wrap_mem_access x y f =
+  save_eax_edx @@ [Mov (x, eax); Mov (y, edx)] @ (f eax edx) @ [Mov (edx, y)]
+   
+let compare x y cmp =
+  [Cmp (x, y); cmp; Movzbl]
+
 class env =
   object (this)
     val locals = S.empty
     val depth  = 0
 	
     method allocate = function
-      | []                          -> this, R 0
+      | []                          -> this, R 1
       | R i :: _ when i < nregs - 1 -> this, R (i+1)
       | S i :: _                    -> {< depth = max depth (i+1) >}, S (i+1)
       | _                           -> {< depth = max depth 1 >}, S 1 
@@ -71,26 +127,71 @@ let rec sint env prg sstack =
         | LD x ->
             let env'     = env#local x in
             let env'', s = env'#allocate sstack in
-            env'', [Mov (M x, s)], s :: sstack
-	| ST x ->
+            env'', (wrap_mem_access (M x) s @@ fun x y -> [Mov (x, y)]), s :: sstack
+	    | ST x ->
             let env' = env#local x in
             let s :: sstack' = sstack in
             env', [Mov (s, M x)], sstack' 
         | READ  ->
             env, [Call "lread"], [eax]
         | WRITE ->
-            env, [Push eax; Call "lwrite"; Pop edx], [] 
-        | _ ->
+            env, [Push (R 1); Call "lwrite"; Pop (R 1)], [] 
+        | LABEL lbl ->
+                  (env, [Lbl lbl], sstack)
+        | GOTO lbl ->
+                  (env, [Goto lbl], sstack)
+        | IFGOTO (e, lbl) ->
+                  let y::stack' = sstack in
+                  (env, [Cmp (L 0, y); Ifgoto (e, lbl)], stack')
+        | BINOP op ->
             let x::(y::_ as sstack') = sstack in
-            (fun op ->
-              match x, y with
-              | S _, S _ -> env, [Mov (y, edx); op x edx; Mov (edx, y)], sstack'
-              | _        -> env, [op x y], sstack'   
-            )
-              (match i with 
-	      | MUL -> fun x y -> Mul (x, y)
-	      | ADD -> fun x y -> Add (x, y)
-              )
+            env, (match op with
+                 | "+" ->
+                    wrap_mem_access x y @@ fun x y -> [Add (x, y); Mov (y, eax)]
+                 | "-" ->
+                    wrap_mem_access x y @@ fun x y -> [Sub (x, y); Mov (y, eax)]
+                 | "*" ->
+                     save_eax_edx [Mov (y, eax); Mul (x, eax); Mov (eax, y)]
+                 | "/" ->
+                    save_eax_edx [Mov (y, eax); Cdq; Div (x, y); Mov (eax, y)]
+                 | "%" ->
+                    save_eax_edx [Mov (y, eax); Cdq; Div (x, y); Mov (edx, y)]
+                 | "<" ->
+                    wrap_mem_access x y @@ fun x y -> compare x y Setl
+                 | "<=" ->
+                    wrap_mem_access x y @@ fun x y -> compare x y Setle
+                 | ">" ->
+                    wrap_mem_access x y @@ fun x y -> compare x y Setg
+                 | ">=" ->
+                    wrap_mem_access x y @@ fun x y -> compare x y Setge
+                 | "==" ->
+                    wrap_mem_access x y @@ fun x y -> compare x y Sete
+                 | "!=" ->
+                    wrap_mem_access x y @@ fun x y -> compare x y Setne
+                 | "&&" ->
+                    save_eax_edx [
+                                    (* Set eax value to null, mov x to edx, check that edx is not null
+                                       if it is true - in eax we now have not null 
+                                    *)
+                                    Xor (eax, eax);
+                                    Mov (x, edx);
+                                    Cmp (edx, eax);
+                                    Setne;
+                                    Mov (y, edx);
+                                    Mul (eax, edx);
+                                    Xor (eax, eax);
+                                    Cmp (edx, eax);
+                                    Setne;
+                                    Mov (eax, y)]
+                 | "!!" ->
+                    save_eax_edx [
+                                    Xor (eax, eax);
+                                    Mov (x, edx);
+                                    Or (y, edx);
+                                    Cmp (edx, eax);
+                                    Setne;
+                                    Mov (eax, y)]
+              ), sstack'
       in
       let env, code', sstack'' = sint env prg' sstack' in
       env, code @ code', sstack''