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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- G N A T . A L T I V E C . V E C T O R _ T Y P E S --
-- --
-- S p e c --
-- --
-- Copyright (C) 2004-2005, 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, 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. --
-- --
------------------------------------------------------------------------------
-- This unit exposes the various vector types part of the Ada binding to
-- Altivec facilities.
with GNAT.Altivec.Low_Level_Vectors;
package GNAT.Altivec.Vector_Types is
use GNAT.Altivec.Low_Level_Vectors;
---------------------------------------------------
-- Vector type declarations [PIM-2.1 Data Types] --
---------------------------------------------------
-- Except for assignments and pointer creation/dereference, operations
-- on vectors are only performed via subprograms. The vector types are
-- then private, and non-limited since assignments are allowed.
-- The Hard/Soft binding type-structure differentiation is achieved in
-- Low_Level_Vectors. Each version only exposes private vector types, that
-- we just sub-type here. This is fine from the design standpoint and
-- reduces the amount of explicit conversion required in various places
-- internally.
subtype vector_unsigned_char is Low_Level_Vectors.LL_VUC;
subtype vector_signed_char is Low_Level_Vectors.LL_VSC;
subtype vector_bool_char is Low_Level_Vectors.LL_VBC;
subtype vector_unsigned_short is Low_Level_Vectors.LL_VUS;
subtype vector_signed_short is Low_Level_Vectors.LL_VSS;
subtype vector_bool_short is Low_Level_Vectors.LL_VBS;
subtype vector_unsigned_int is Low_Level_Vectors.LL_VUI;
subtype vector_signed_int is Low_Level_Vectors.LL_VSI;
subtype vector_bool_int is Low_Level_Vectors.LL_VBI;
subtype vector_float is Low_Level_Vectors.LL_VF;
subtype vector_pixel is Low_Level_Vectors.LL_VP;
-- [PIM-2.1] shows groups of declarations with exact same component types,
-- e.g. vector unsigned short together with vector unsigned short int. It
-- so appears tempting to define subtypes for those matches here.
--
-- [PIM-2.1] does not qualify items in those groups as "the same types",
-- though, and [PIM-2.4.2 Assignments] reads: "if either the left hand
-- side or the right hand side of an expression has a vector type, then
-- both sides of the expression must be of the same vector type".
--
-- Not so clear what is exactly right, then. We go with subtypes for now
-- and can adjust later if need be.
subtype vector_unsigned_short_int is vector_unsigned_short;
subtype vector_signed_short_int is vector_signed_short;
subtype vector_char is vector_signed_char;
subtype vector_short is vector_signed_short;
subtype vector_int is vector_signed_int;
--------------------------------
-- Corresponding access types --
--------------------------------
type vector_unsigned_char_ptr is access all vector_unsigned_char;
type vector_signed_char_ptr is access all vector_signed_char;
type vector_bool_char_ptr is access all vector_bool_char;
type vector_unsigned_short_ptr is access all vector_unsigned_short;
type vector_signed_short_ptr is access all vector_signed_short;
type vector_bool_short_ptr is access all vector_bool_short;
type vector_unsigned_int_ptr is access all vector_unsigned_int;
type vector_signed_int_ptr is access all vector_signed_int;
type vector_bool_int_ptr is access all vector_bool_int;
type vector_float_ptr is access all vector_float;
type vector_pixel_ptr is access all vector_pixel;
--------------------------------------------------------------------
-- Additional access types, for the sake of some argument passing --
--------------------------------------------------------------------
-- ... because some of the operations expect pointers to possibly
-- constant objects.
type const_vector_bool_char_ptr is access constant vector_bool_char;
type const_vector_signed_char_ptr is access constant vector_signed_char;
type const_vector_unsigned_char_ptr is access constant vector_unsigned_char;
type const_vector_bool_short_ptr is access constant vector_bool_short;
type const_vector_signed_short_ptr is access constant vector_signed_short;
type const_vector_unsigned_short_ptr is access
constant vector_unsigned_short;
type const_vector_bool_int_ptr is access constant vector_bool_int;
type const_vector_signed_int_ptr is access constant vector_signed_int;
type const_vector_unsigned_int_ptr is access constant vector_unsigned_int;
type const_vector_float_ptr is access constant vector_float;
type const_vector_pixel_ptr is access constant vector_pixel;
----------------------
-- Useful shortcuts --
----------------------
subtype VUC is vector_unsigned_char;
subtype VSC is vector_signed_char;
subtype VBC is vector_bool_char;
subtype VUS is vector_unsigned_short;
subtype VSS is vector_signed_short;
subtype VBS is vector_bool_short;
subtype VUI is vector_unsigned_int;
subtype VSI is vector_signed_int;
subtype VBI is vector_bool_int;
subtype VP is vector_pixel;
subtype VF is vector_float;
end GNAT.Altivec.Vector_Types;
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