157 lines
5.9 KiB
Ada
157 lines
5.9 KiB
Ada
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------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- G N A T . A L T I V E C . V E C T O R _ V I E W S --
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-- --
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-- S p e c --
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-- --
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-- Copyright (C) 2005-2009, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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-- This unit provides public 'View' data types from/to which private vector
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-- representations can be converted via Altivec.Conversions. This allows
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-- convenient access to individual vector elements and provides a simple way
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-- to initialize vector objects.
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-- Accessing vector contents with direct memory overlays should be avoided
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-- because actual vector representations may vary across configurations, for
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-- instance to accommodate different target endianness.
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-- The natural representation of a vector is an array indexed by vector
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-- component number, which is materialized by the Varray type definitions
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-- below. The 16byte alignment constraint is unfortunately sometimes not
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-- properly honored for constant array aggregates, so the View types are
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-- actually records enclosing such arrays.
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package GNAT.Altivec.Vector_Views is
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---------------------
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-- char components --
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---------------------
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type Vchar_Range is range 1 .. 16;
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type Varray_unsigned_char is array (Vchar_Range) of unsigned_char;
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for Varray_unsigned_char'Alignment use VECTOR_ALIGNMENT;
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type VUC_View is record
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Values : Varray_unsigned_char;
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end record;
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type Varray_signed_char is array (Vchar_Range) of signed_char;
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for Varray_signed_char'Alignment use VECTOR_ALIGNMENT;
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type VSC_View is record
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Values : Varray_signed_char;
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end record;
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type Varray_bool_char is array (Vchar_Range) of bool_char;
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for Varray_bool_char'Alignment use VECTOR_ALIGNMENT;
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type VBC_View is record
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Values : Varray_bool_char;
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end record;
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----------------------
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-- short components --
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----------------------
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type Vshort_Range is range 1 .. 8;
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type Varray_unsigned_short is array (Vshort_Range) of unsigned_short;
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for Varray_unsigned_short'Alignment use VECTOR_ALIGNMENT;
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type VUS_View is record
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Values : Varray_unsigned_short;
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end record;
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type Varray_signed_short is array (Vshort_Range) of signed_short;
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for Varray_signed_short'Alignment use VECTOR_ALIGNMENT;
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type VSS_View is record
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Values : Varray_signed_short;
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end record;
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type Varray_bool_short is array (Vshort_Range) of bool_short;
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for Varray_bool_short'Alignment use VECTOR_ALIGNMENT;
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type VBS_View is record
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Values : Varray_bool_short;
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end record;
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--------------------
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-- int components --
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--------------------
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type Vint_Range is range 1 .. 4;
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type Varray_unsigned_int is array (Vint_Range) of unsigned_int;
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for Varray_unsigned_int'Alignment use VECTOR_ALIGNMENT;
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type VUI_View is record
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Values : Varray_unsigned_int;
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end record;
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type Varray_signed_int is array (Vint_Range) of signed_int;
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for Varray_signed_int'Alignment use VECTOR_ALIGNMENT;
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type VSI_View is record
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Values : Varray_signed_int;
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end record;
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type Varray_bool_int is array (Vint_Range) of bool_int;
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for Varray_bool_int'Alignment use VECTOR_ALIGNMENT;
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type VBI_View is record
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Values : Varray_bool_int;
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end record;
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----------------------
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-- float components --
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----------------------
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type Vfloat_Range is range 1 .. 4;
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type Varray_float is array (Vfloat_Range) of C_float;
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for Varray_float'Alignment use VECTOR_ALIGNMENT;
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type VF_View is record
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Values : Varray_float;
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end record;
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----------------------
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-- pixel components --
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----------------------
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type Vpixel_Range is range 1 .. 8;
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type Varray_pixel is array (Vpixel_Range) of pixel;
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for Varray_pixel'Alignment use VECTOR_ALIGNMENT;
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type VP_View is record
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Values : Varray_pixel;
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end record;
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end GNAT.Altivec.Vector_Views;
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