New Language: Ada

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@45953 138bc75d-0d04-0410-961f-82ee72b054a4

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+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT RUN-TIME COMPONENTS                         --
+--                                                                          --
+--         A D A . N U M E R I C S . D I S C R E T E _ R A N D O M          --
+--                                                                          --
+--                                 S p e c                                  --
+--                                                                          --
+--                            $Revision: 1.13 $
+--                                                                          --
+--          Copyright (C) 1992-2001 Free Software Foundation, Inc.          --
+--                                                                          --
+-- This specification is derived from the Ada Reference Manual for use with --
+-- GNAT. The copyright notice above, and the license provisions that follow --
+-- apply solely to the  contents of the part following the private keyword. --
+--                                                                          --
+-- GNAT is free software;  you can  redistribute it  and/or modify it under --
+-- terms of the  GNU General Public License as published  by the Free Soft- --
+-- ware  Foundation;  either version 2,  or (at your option) any later ver- --
+-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
+-- OUT 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  distributed with GNAT;  see file COPYING.  If not, write --
+-- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
+-- MA 02111-1307, USA.                                                      --
+--                                                                          --
+-- As a special exception,  if other files  instantiate  generics from this --
+-- unit, or you link  this unit with other files  to produce an executable, --
+-- this  unit  does not  by itself cause  the resulting  executable  to  be --
+-- covered  by the  GNU  General  Public  License.  This exception does not --
+-- however invalidate  any other reasons why  the executable file  might be --
+-- covered by the  GNU Public License.                                      --
+--                                                                          --
+-- GNAT was originally developed  by the GNAT team at  New York University. --
+-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
+--                                                                          --
+------------------------------------------------------------------------------
+
+--  Note: the implementation used in this package was contributed by
+--  Robert Eachus. It is based on the work of L. Blum, M. Blum, and
+--  M. Shub, SIAM Journal of Computing, Vol 15. No 2, May 1986. The
+--  particular choices for P and Q chosen here guarantee a period of
+--  562,085,314,430,582 (about 2**49), and the generated sequence has
+--  excellent randomness properties. For further details, see the
+--  paper "Fast Generation of Trustworthy Random Numbers", by Robert
+--  Eachus, which describes both the algorithm and the efficient
+--  implementation approach used here.
+
+with Interfaces;
+
+generic
+   type Result_Subtype is (<>);
+
+package Ada.Numerics.Discrete_Random is
+
+   --  Basic facilities.
+
+   type Generator is limited private;
+
+   function Random (Gen : Generator) return Result_Subtype;
+
+   procedure Reset (Gen : Generator);
+   procedure Reset (Gen : Generator; Initiator : Integer);
+
+   --  Advanced facilities.
+
+   type State is private;
+
+   procedure Save  (Gen : Generator; To_State   : out State);
+   procedure Reset (Gen : Generator; From_State : State);
+
+   Max_Image_Width : constant := 80;
+
+   function Image (Of_State    : State)  return String;
+   function Value (Coded_State : String) return State;
+
+private
+   subtype Int is Interfaces.Integer_32;
+   subtype Rst is Result_Subtype;
+
+   type Flt is digits 14;
+
+   RstF : constant Flt := Flt (Rst'Pos (Rst'First));
+   RstL : constant Flt := Flt (Rst'Pos (Rst'Last));
+
+   Offs : constant Flt := RstF - 0.5;
+
+   K1   : constant := 94_833_359;
+   K1F  : constant := 94_833_359.0;
+   K2   : constant := 47_416_679;
+   K2F  : constant := 47_416_679.0;
+   Scal : constant Flt := (RstL - RstF + 1.0) / (K1F * K2F);
+
+   type State is record
+      X1  : Int := Int (2999 ** 2);
+      X2  : Int := Int (1439 ** 2);
+      P   : Int := K1;
+      Q   : Int := K2;
+      FP  : Flt := K1F;
+      Scl : Flt := Scal;
+   end record;
+
+   type Generator is limited record
+      Gen_State : State;
+   end record;
+
+end Ada.Numerics.Discrete_Random;