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+------------------------------------------------------------------------------
+-- --
+-- GNAT RUN-TIME LIBRARY COMPONENTS --
+-- --
+-- S Y S T E M . C O M P A R E _ A R R A Y _ U N S I G N E D _ 6 4 --
+-- --
+-- B o d y --
+-- --
+-- Copyright (C) 2002-2005 Free Software Foundation, Inc. --
+-- --
+-- 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, 51 Franklin Street, Fifth Floor, --
+-- Boston, MA 02110-1301, 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. --
+-- Extensive contributions were provided by Ada Core Technologies Inc. --
+-- --
+------------------------------------------------------------------------------
+
+with System.Address_Operations; use System.Address_Operations;
+
+with Unchecked_Conversion;
+
+package body System.Compare_Array_Unsigned_64 is
+
+ type Word is mod 2 ** 64;
+ -- Used to process operands by words
+
+ type Uword is record
+ W : Word;
+ end record;
+ pragma Pack (Uword);
+ for Uword'Alignment use 1;
+ -- Used to process operands when unaligned
+
+ type WP is access Word;
+ type UP is access Uword;
+
+ function W is new Unchecked_Conversion (Address, WP);
+ function U is new Unchecked_Conversion (Address, UP);
+
+ -----------------------
+ -- Compare_Array_U64 --
+ -----------------------
+
+ function Compare_Array_U64
+ (Left : System.Address;
+ Right : System.Address;
+ Left_Len : Natural;
+ Right_Len : Natural) return Integer
+ is
+ Clen : Natural := Natural'Min (Left_Len, Right_Len);
+ -- Number of elements left to compare
+
+ L : Address := Left;
+ R : Address := Right;
+ -- Pointers to next elements to compare
+
+ begin
+ -- Case of going by aligned double words
+
+ if ModA (OrA (Left, Right), 8) = 0 then
+ while Clen /= 0 loop
+ if W (L).all /= W (R).all then
+ if W (L).all > W (R).all then
+ return +1;
+ else
+ return -1;
+ end if;
+ end if;
+
+ Clen := Clen - 1;
+ L := AddA (L, 8);
+ R := AddA (R, 8);
+ end loop;
+
+ -- Case of going by unaligned double words
+
+ else
+ while Clen /= 0 loop
+ if U (L).W /= U (R).W then
+ if U (L).W > U (R).W then
+ return +1;
+ else
+ return -1;
+ end if;
+ end if;
+
+ Clen := Clen - 1;
+ L := AddA (L, 8);
+ R := AddA (R, 8);
+ end loop;
+ end if;
+
+ -- Here if common section equal, result decided by lengths
+
+ if Left_Len = Right_Len then
+ return 0;
+ elsif Left_Len > Right_Len then
+ return +1;
+ else
+ return -1;
+ end if;
+ end Compare_Array_U64;
+
+end System.Compare_Array_Unsigned_64;