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diff --git a/lib/int63_on_64.ml b/lib/int63_on_64.ml
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+(* 63 bit signed integer type.
+   (C) Copyright 2008 Richard W.M. Jones, Red Hat Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *)
+
+(* This is the 64 bit implementation so for efficiency we used the
+ * unboxed int type directly.
+ *)
+type t = int
+
+module Operators = struct
+  type int63 = t
+
+  external ( +^ ) : int -> int -> int = "%addint"
+  external ( -^ ) : int -> int -> int = "%subint"
+  external ( *^ ) : int -> int -> int = "%mulint"
+  external ( /^ ) : int -> int -> int = "%divint"
+  external ( <<^ ) : int -> int -> int = "%lslint"
+  external ( >>^ ) : int -> int -> int = "%lsrint"
+  external ( ~^ ) : int -> int = "%identity"
+  external ( ~^~ ) : int -> int = "%negint"
+end
+
+let zero = 0
+let one = 1
+let minus_one = ~1
+
+external neg : int -> int = "%negint"
+
+external add : int -> int -> int = "%addint"
+external sub : int -> int -> int = "%subint"
+external mul : int -> int -> int = "%mulint"
+external div : int -> int -> int = "%divint"
+external rem : int -> int -> int = "%modint"
+
+external succ : int -> int = "%succint"
+external pred : int -> int = "%predint"
+
+let abs = abs
+
+let max_int = max_int
+let min_int = min_int
+
+external logand : int -> int -> int = "%andint"
+external logor : int -> int -> int = "%orint"
+external logxor : int -> int -> int = "%xorint"
+let lognot = lnot
+
+external shift_left : int -> int -> int = "%lslint"
+external shift_right : int -> int -> int = "%asrint"
+external shift_right_logical : int -> int -> int = "%lsrint"
+
+external of_int : int -> int = "%identity"
+external to_int : int -> int = "%identity"
+external of_float : float -> int = "%intoffloat"
+external to_float : int -> float = "%floatofint"
+external of_int32 : int32 -> int = "%int32_to_int"
+external to_int32 : int -> int32 = "%int32_of_int"
+external of_int64 : int64 -> int = "%int64_to_int"
+external to_int64 : int -> int64 = "%int64_of_int"
+external of_nativeint : nativeint -> int = "%nativeint_to_int"
+external to_nativeint : int -> nativeint = "%nativeint_of_int"
+
+external of_string : string -> int = "caml_int_of_string"
+let to_string = string_of_int
+
+(*external compare : int -> int -> int = "%compare"*)
+(* I think it should be faster to use a specialized compare: *)
+let compare : int -> int -> int = compare