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------------------------------------------------------------------------------
-- --
-- GNU ADA RUNTIME LIBRARY (GNARL) COMPONENTS --
-- --
-- S Y S T E M . G E N E R I C _ V E C T O R _ O P E R A T I O N S --
-- --
-- B o d y --
-- --
-- Copyright (C) 2002-2003 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; use System;
with System.Storage_Elements; use System.Storage_Elements;
with Ada.Unchecked_Conversion; use Ada;
package body System.Generic_Vector_Operations is
VU : constant Address := Vectors.Vector'Size / Storage_Unit;
EU : constant Address := Element_Array'Component_Size / Storage_Unit;
----------------------
-- Binary_Operation --
----------------------
procedure Binary_Operation
(R, X, Y : System.Address;
Length : System.Storage_Elements.Storage_Count)
is
RA : Address := R;
XA : Address := X;
YA : Address := Y;
-- Address of next element to process in R, X and Y
Unaligned : constant Boolean := (RA or XA or YA) mod VU /= 0;
-- False iff one or more argument addresses is not aligned
type Vector_Ptr is access all Vectors.Vector;
type Element_Ptr is access all Element;
function VP is new Unchecked_Conversion (Address, Vector_Ptr);
function EP is new Unchecked_Conversion (Address, Element_Ptr);
SA : constant Address := XA + ((Length + 0) / VU * VU
and (Boolean'Pos (Unaligned) - Address'(1)));
-- First address of argument X to start serial processing
begin
while XA < SA loop
VP (RA).all := Vector_Op (VP (XA).all, VP (YA).all);
XA := XA + VU;
YA := YA + VU;
RA := RA + VU;
end loop;
while XA < X + Length loop
EP (RA).all := Element_Op (EP (XA).all, EP (YA).all);
XA := XA + EU;
YA := YA + EU;
RA := RA + EU;
end loop;
end Binary_Operation;
----------------------
-- Unary_Operation --
----------------------
procedure Unary_Operation
(R, X : System.Address;
Length : System.Storage_Elements.Storage_Count)
is
RA : Address := R;
XA : Address := X;
-- Address of next element to process in R and X
Unaligned : constant Boolean := (RA or XA) mod VU /= 0;
-- False iff one or more argument addresses is not aligned
type Vector_Ptr is access all Vectors.Vector;
type Element_Ptr is access all Element;
function VP is new Unchecked_Conversion (Address, Vector_Ptr);
function EP is new Unchecked_Conversion (Address, Element_Ptr);
SA : constant Address := XA + ((Length + 0) / VU * VU
and (Boolean'Pos (Unaligned) - Address'(1)));
-- First address of argument X to start serial processing
begin
while XA < SA loop
VP (RA).all := Vector_Op (VP (XA).all);
XA := XA + VU;
RA := RA + VU;
end loop;
while XA < X + Length loop
EP (RA).all := Element_Op (EP (XA).all);
XA := XA + EU;
RA := RA + EU;
end loop;
end Unary_Operation;
end System.Generic_Vector_Operations;
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