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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- G N A T . A L T I V E C . V E C T O R _ V I E W S --
-- --
-- S p e c --
-- --
-- Copyright (C) 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 provides public 'View' data types from/to which private vector
-- representations can be converted via Altivec.Conversions. This allows
-- convenient access to individual vector elements and provides a simple way
-- to initialize vector objects.
-- Accessing vector contents with direct memory overlays should be avoided
-- because actual vector representations may vary across configurations, for
-- instance to accomodate different target endianness.
-- The natural representation of a vector is an array indexed by vector
-- component number, which is materialized by the Varray type definitions
-- below. The 16byte alignment constraint is unfortunately sometimes not
-- properly honored for constant array aggregates, so the View types are
-- actually records enclosing such arrays.
package GNAT.Altivec.Vector_Views is
---------------------
-- char components --
---------------------
type Vchar_Range is range 1 .. 16;
type Varray_unsigned_char is array (Vchar_Range) of unsigned_char;
for Varray_unsigned_char'Alignment use VECTOR_ALIGNMENT;
type VUC_View is record
Values : Varray_unsigned_char;
end record;
type Varray_signed_char is array (Vchar_Range) of signed_char;
for Varray_signed_char'Alignment use VECTOR_ALIGNMENT;
type VSC_View is record
Values : Varray_signed_char;
end record;
type Varray_bool_char is array (Vchar_Range) of bool_char;
for Varray_bool_char'Alignment use VECTOR_ALIGNMENT;
type VBC_View is record
Values : Varray_bool_char;
end record;
----------------------
-- short components --
----------------------
type Vshort_Range is range 1 .. 8;
type Varray_unsigned_short is array (Vshort_Range) of unsigned_short;
for Varray_unsigned_short'Alignment use VECTOR_ALIGNMENT;
type VUS_View is record
Values : Varray_unsigned_short;
end record;
type Varray_signed_short is array (Vshort_Range) of signed_short;
for Varray_signed_short'Alignment use VECTOR_ALIGNMENT;
type VSS_View is record
Values : Varray_signed_short;
end record;
type Varray_bool_short is array (Vshort_Range) of bool_short;
for Varray_bool_short'Alignment use VECTOR_ALIGNMENT;
type VBS_View is record
Values : Varray_bool_short;
end record;
--------------------
-- int components --
--------------------
type Vint_Range is range 1 .. 4;
type Varray_unsigned_int is array (Vint_Range) of unsigned_int;
for Varray_unsigned_int'Alignment use VECTOR_ALIGNMENT;
type VUI_View is record
Values : Varray_unsigned_int;
end record;
type Varray_signed_int is array (Vint_Range) of signed_int;
for Varray_signed_int'Alignment use VECTOR_ALIGNMENT;
type VSI_View is record
Values : Varray_signed_int;
end record;
type Varray_bool_int is array (Vint_Range) of bool_int;
for Varray_bool_int'Alignment use VECTOR_ALIGNMENT;
type VBI_View is record
Values : Varray_bool_int;
end record;
----------------------
-- float components --
----------------------
type Vfloat_Range is range 1 .. 4;
type Varray_float is array (Vfloat_Range) of C_float;
for Varray_float'Alignment use VECTOR_ALIGNMENT;
type VF_View is record
Values : Varray_float;
end record;
----------------------
-- pixel components --
----------------------
type Vpixel_Range is range 1 .. 8;
type Varray_pixel is array (Vpixel_Range) of pixel;
for Varray_pixel'Alignment use VECTOR_ALIGNMENT;
type VP_View is record
Values : Varray_pixel;
end record;
end GNAT.Altivec.Vector_Views;
|
