Memorize size_in_bytes inside Tnode.t

arrayjit/lib/backends.ml

@@ -271,7 +271,7 @@ module Add_device
 
   let device_to_device tn ~into_merge_buffer ~dst_ptr ~dst ~src_ptr ~src =
     let s = dst.stream in
-    let size_in_bytes = Tnode.size_in_bytes tn in
+    let size_in_bytes = Lazy.force tn.Tnode.size_in_bytes in
     let work =
       (* TODO: log the operation if [Utils.settings.with_log_level > 1]. *)
       match (into_merge_buffer, dst_ptr) with
@@ -280,7 +280,6 @@ module Add_device
       | Streaming_for _, _ -> fun () -> s.merge_buffer := Some { ptr = src_ptr; size_in_bytes }
       | Copy, _ ->
           fun () ->
-            let size_in_bytes = Tnode.size_in_bytes tn in
             let allocated_capacity =
               match s.allocated_buffer with None -> 0 | Some buf -> buf.size_in_bytes
             in

arrayjit/lib/c_syntax.ml

@@ -34,7 +34,8 @@ struct
   let in_ctx tn = B.(Tn.is_in_context_force ~use_host_memory tn 46)
 
   let pp_zero_out ppf tn =
-    Stdlib.Format.fprintf ppf "@[<2>memset(%s, 0, %d);@]@ " (get_ident tn) @@ Tn.size_in_bytes tn
+    Stdlib.Format.fprintf ppf "@[<2>memset(%s, 0, %d);@]@ " (get_ident tn)
+    @@ Lazy.force tn.size_in_bytes
 
   let pp_include ppf s = Stdlib.Format.fprintf ppf "#include %s" s
 

arrayjit/lib/cuda_backend.cudajit.ml

@@ -198,7 +198,7 @@ let device_to_device tn ~into_merge_buffer ~dst_ptr ~dst ~src_ptr ~src =
      dst.stream.stream_id src.stream.stream_id; *)
   let dev = dst.stream.device in
   let same_device = dev.ordinal = src.stream.device.ordinal in
-  let size_in_bytes = Tn.size_in_bytes tn in
+  let size_in_bytes = Lazy.force tn.Tn.size_in_bytes in
   let memcpy ~dst_ptr =
     if same_device && Cu.Deviceptr.equal dst_ptr src_ptr then ()
     else if same_device then
@@ -217,7 +217,6 @@ let device_to_device tn ~into_merge_buffer ~dst_ptr ~dst ~src_ptr ~src =
       dst.stream.merge_buffer := Some { ptr = src_ptr; size_in_bytes }
   | Copy, _ ->
       set_ctx @@ ctx_of dst;
-      let size_in_bytes = Tn.size_in_bytes tn in
       opt_alloc_merge_buffer ~size_in_bytes dev.dev dst.stream;
       let buffer = Option.value_exn ~here:[%here] !(dst.stream.merge_buffer) in
       memcpy ~dst_ptr:buffer.ptr

arrayjit/lib/gcc_backend.gccjit.ml

@@ -93,7 +93,7 @@ let zero_out ctx block node =
        [
          Lazy.force node.ptr;
          RValue.zero ctx c_int;
-         RValue.int ctx c_index @@ Tn.size_in_bytes node.tn;
+         RValue.int ctx c_index @@ Lazy.force node.tn.size_in_bytes;
        ]
 
 let get_c_ptr ctx num_typ ptr = Gccjit.(RValue.ptr ctx (Type.pointer num_typ) ptr)

arrayjit/lib/tnode.ml

@@ -62,16 +62,14 @@ type memory_mode =
           optional [array] of {!t}). *)
 [@@deriving sexp, compare, equal]
 
-type delayed_prec =
-  | Not_specified
-  | Default_spec of (Ops.prec Lazy.t[@sexp.opaque])
-  | Specified of Ops.prec
+type delayed_prec = Not_specified | Default_spec of Ops.prec Lazy.t | Specified of Ops.prec
 [@@deriving sexp, equal]
 
 type t = {
-  array : (Nd.t option Lazy.t[@sexp.opaque]);
-  prec : (Ops.prec Lazy.t[@sexp.opaque]);
-  dims : (int array Lazy.t[@sexp.opaque]);
+  array : Nd.t option Lazy.t;
+  prec : Ops.prec Lazy.t;
+  dims : int array Lazy.t;
+  size_in_bytes : int Lazy.t;
   id : int;
   label : string list;
       (** Display information. It is better if the last element of the list is the most narrow or
@@ -90,7 +88,6 @@ let num_elems tn =
   let dims = Lazy.force tn.dims in
   if Array.is_empty dims then 0 else Array.reduce_exn dims ~f:( * )
 
-let size_in_bytes tn = num_elems tn * Ops.prec_in_bytes (Lazy.force tn.prec)
 let id { id; _ } = "n" ^ Int.to_string id
 let label a = String.concat ~sep:"_" a.label
 let is_alphanum_ = String.for_all ~f:(fun c -> Char.equal c '_' || Char.is_alphanum c)
@@ -512,6 +509,7 @@ let create ?default_prec ~id ~label ~dims init_op =
       | Specified prec | Default_spec (lazy prec) -> prec
       | Not_specified ->
           raise @@ Utils.User_error "Tnode.update_prec: precision is not specified yet")
+  and size_in_bytes = lazy (num_elems tn * Ops.prec_in_bytes (Lazy.force tn.prec))
   and tn =
     let delayed_prec_unsafe =
       match default_prec with None -> Not_specified | Some prec -> Default_spec prec
@@ -521,6 +519,7 @@ let create ?default_prec ~id ~label ~dims init_op =
       delayed_prec_unsafe;
       prec;
       dims;
+      size_in_bytes;
       id;
       label;
       memory_mode = None;
@@ -541,6 +540,7 @@ let find =
       prec = lazy Ops.single;
       delayed_prec_unsafe = Specified Ops.single;
       dims = lazy [||];
+      size_in_bytes = lazy 0;
       id = -1;
       label = [];
       memory_mode = None;