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|
open Netlist_ast
type t = program -> (arg * program)
let id =
let cnt = ref 0 in
fun s ->
let res = s ^ "_l_" ^ (string_of_int !cnt) in
incr cnt; res
let get_size p arg = match arg with
| Avar(id) -> Env.find id p.p_vars
| Aconst(k) -> Array.length k
let add p id eq size =
assert (not (Env.mem id p.p_vars)
|| (Env.find id p.p_vars = size));
assert (not (List.mem_assoc id p.p_eqs));
{ p_eqs = (id, eq)::p.p_eqs;
p_inputs = p.p_inputs;
p_outputs = p.p_outputs;
p_vars = Env.add id size p.p_vars }
let get id =
fun p ->
assert (Env.mem id p.p_vars);
(Avar id, p)
let loop s =
let i = id "" in
(fun p ->
(Avar i),
{ p_eqs = p.p_eqs;
p_inputs = p.p_inputs;
p_outputs = p.p_outputs;
p_vars = Env.add i s p.p_vars }),
(fun v1 ->
fun p ->
(Avar i),
(if List.mem_assoc i p.p_eqs then p else
let x, p = v1 p in
add p i (Earg x) s))
let ignore v1 v2 =
fun p ->
let v1, p = v1 p in
v2 p
let ( ^. ) v1 v2 = ignore v1 v2
let const n =
let l = String.length n in
let v = Array.init l (fun i -> n.[i] = '1') in
fun p ->
(Aconst v, p)
let ( ++ ) v1 v2 =
let i = id "" in
fun p ->
if List.mem_assoc i p.p_eqs then Avar i, p else
let x1, p = v1 p in
let x2, p = v2 p in
let sz1, sz2 = get_size p x1, get_size p x2 in
(Avar i), add p i (Econcat (x1, x2)) (sz1 + sz2)
let ( ^| ) v1 v2 =
let i = id "" in
fun p ->
if List.mem_assoc i p.p_eqs then Avar i, p else
let x1, p = v1 p in
let x2, p = v2 p in
let sz = get_size p x1 in
assert (sz = get_size p x2);
(Avar i), add p i (Ebinop (Or, x1, x2)) sz
let ( ^^ ) v1 v2 =
let i = id "" in
fun p ->
if List.mem_assoc i p.p_eqs then Avar i, p else
let x1, p = v1 p in
let x2, p = v2 p in
let sz = get_size p x1 in
assert (sz = get_size p x2);
(Avar i), add p i (Ebinop (Xor, x1, x2)) sz
let ( ^& ) v1 v2 =
let i = id "" in
fun p ->
if List.mem_assoc i p.p_eqs then Avar i, p else
let x1, p = v1 p in
let x2, p = v2 p in
let sz = get_size p x1 in
assert (sz = get_size p x2);
(Avar i), add p i (Ebinop (And, x1, x2)) sz
let ( ^$ ) v1 v2 =
let i = id "" in
fun p ->
if List.mem_assoc i p.p_eqs then Avar i, p else
let x1, p = v1 p in
let x2, p = v2 p in
let sz = get_size p x1 in
assert (sz = get_size p x2);
(Avar i), add p i (Ebinop (Nand, x1, x2)) sz
let not v1 =
let i = id "" in
fun p ->
if List.mem_assoc i p.p_eqs then Avar i, p else
let x, p = v1 p in
(Avar i), add p i (Enot (x)) (get_size p x)
let mux v1 v2 v3 =
let i = id "" in
fun p ->
if List.mem_assoc i p.p_eqs then Avar i, p else
let x1, p = v1 p in
let x2, p = v2 p in
let x3, p = v3 p in
let sz = get_size p x2 in
assert (get_size p x3 = sz);
assert (get_size p x1 = 1);
(Avar i), add p i (Emux (x1, x2, x3)) sz
let ( ** ) v s =
let i = id "" in
fun p ->
if List.mem_assoc i p.p_eqs then Avar i, p else
let x, p = v p in
let sz = get_size p x in
assert (s >= 0 && s < sz);
(Avar i), add p i (Eselect (s, x)) 1
let ( % ) v (s1, s2) =
let i = id "" in
fun p ->
if List.mem_assoc i p.p_eqs then Avar i, p else
let x, p = v p in
let sz = get_size p x in
assert (s1 >= 0 && s2 >= s1 && sz > s2);
(Avar i), add p i (Eslice (s1, s2, x)) (s2 - s1 + 1)
let rom i a_s w_s ra =
let i = id i in
fun p ->
if List.mem_assoc i p.p_eqs then Avar i, p else
let ra, p = ra p in
assert ((get_size p ra) = a_s);
(Avar i), add p i (Erom (a_s, w_s, ra)) w_s
let ram a_s w_s ra we wa d =
let i = id "" in
fun p ->
if List.mem_assoc i p.p_eqs then Avar i, p else
let ra, p = ra p in
let we, p = we p in
let wa, p = wa p in
let d, p = d p in
assert ((get_size p ra) = a_s);
assert ((get_size p wa) = a_s);
assert ((get_size p we) = 1);
assert ((get_size p d) = w_s);
(Avar i), add p i (Eram (a_s, w_s, ra, we, wa, d)) w_s
let reg n v =
let i = id "" in
fun p ->
if List.mem_assoc i p.p_eqs then Avar i, p else
let v, p = v p in
assert (get_size p v = n);
match v with
| Avar j ->
(Avar i), add p i (Ereg j) n
| Aconst k ->
(Avar i), add p i (Earg v) n
let program entries outputs =
let p =
{ p_eqs = [];
p_inputs = (List.map fst entries);
p_outputs = [];
p_vars = List.fold_left
(fun k (e, s) -> Env.add e s k) Env.empty entries }
in
let p, outputs = List.fold_left
(fun (p, outputs) (name, size, x) ->
let x, p = x p in
assert (get_size p x = size);
if x = Avar(name) then
p, name::outputs
else if name <> "" then
add p name (Earg x) size, name::outputs
else
p, outputs)
(p, []) outputs
in
{ p_inputs = p.p_inputs;
p_eqs = p.p_eqs;
p_vars = p.p_vars;
p_outputs = outputs }
(* Netlist printer *)
let init_string n f =
let s = String.make n 'a' in
for i = 0 to n - 1 do
s.[i] <- f i
done;
s
(* value to string *)
let vts bits =
init_string (Array.length bits) (fun i ->
if bits.(i) then '1' else '0')
(* argument to string *)
let ats = function
| Avar id -> id
| Aconst n -> vts n
let s_op = function
| Or -> "OR"
| Xor -> "XOR"
| And -> "AND"
| Nand -> "NAND"
let print oc p =
let print_eq oc (s,e) =
let s_e =
match e with
| Earg a -> ats a
| Ereg s -> "REG " ^ s
| Enot a -> "NOT " ^ (ats a)
| Ebinop (b,a1,a2) -> (s_op b) ^ " " ^ (ats a1) ^ " " ^ (ats a2)
| Emux (a1,a2,a3) ->
"MUX " ^ (ats a1) ^ " " ^ (ats a2) ^ " " ^ (ats a3)
| Erom (n1,n2,a3) ->
"ROM " ^ (string_of_int n1) ^ " " ^ (string_of_int n2) ^
" " ^ (ats a3)
| Eram (n1,n2,a3,a4,a5,a6) ->
"RAM " ^ (string_of_int n1) ^ " " ^ (string_of_int n2) ^
" " ^ (ats a3) ^ " " ^ (ats a4) ^ " " ^ (ats a5) ^
" " ^ (ats a6)
| Econcat (a1,a2) -> "CONCAT " ^ (ats a1) ^ " " ^ (ats a2)
| Eslice (n1,n2,a3) -> "SLICE " ^ (string_of_int n1) ^ " " ^
(string_of_int n2) ^ " " ^ (ats a3)
| Eselect (n,a) -> "SELECT " ^ (string_of_int n) ^ " " ^ (ats a) in
Printf.fprintf oc "%s = %s\n" s s_e in
Printf.fprintf oc "INPUT ";
if p.p_inputs <> [] then
(Printf.fprintf oc "%s" (List.hd p.p_inputs); List.iter
(Printf.fprintf oc ", %s") (List.tl p.p_inputs));
Printf.fprintf oc "\nOUTPUT ";
if p.p_outputs <> [] then
(Printf.fprintf oc "%s" (List.hd p.p_outputs); List.iter
(Printf.fprintf oc ", %s") (List.tl p.p_outputs));
Printf.fprintf oc "\nVAR ";
let stts s t = if t = 1 then s else s ^ " : " ^ (string_of_int t) in
Pervasives.ignore (Env.fold (fun s t b ->
if b then Printf.fprintf oc "%s" (stts s t)
else Printf.fprintf oc ", %s" (stts s t);
false) p.p_vars true);
Printf.fprintf oc "\nIN\n";
List.iter (print_eq oc) p.p_eqs
|
