------------------------------------------------------------------------------ -- -- -- GNU ADA RUNTIME 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) 2002-2004 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, 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. -- -- 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;