151 lines
7.2 KiB
Ada
151 lines
7.2 KiB
Ada
------------------------------------------------------------------------------
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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 _ T Y P E S --
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-- --
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-- S p e c --
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-- --
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-- Copyright (C) 2004-2009, 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 exposes the various vector types part of the Ada binding to
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-- Altivec facilities.
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with GNAT.Altivec.Low_Level_Vectors;
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package GNAT.Altivec.Vector_Types is
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use GNAT.Altivec.Low_Level_Vectors;
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---------------------------------------------------
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-- Vector type declarations [PIM-2.1 Data Types] --
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---------------------------------------------------
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-- Except for assignments and pointer creation/dereference, operations
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-- on vectors are only performed via subprograms. The vector types are
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-- then private, and non-limited since assignments are allowed.
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-- The Hard/Soft binding type-structure differentiation is achieved in
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-- Low_Level_Vectors. Each version only exposes private vector types, that
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-- we just sub-type here. This is fine from the design standpoint and
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-- reduces the amount of explicit conversion required in various places
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-- internally.
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subtype vector_unsigned_char is Low_Level_Vectors.LL_VUC;
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subtype vector_signed_char is Low_Level_Vectors.LL_VSC;
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subtype vector_bool_char is Low_Level_Vectors.LL_VBC;
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subtype vector_unsigned_short is Low_Level_Vectors.LL_VUS;
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subtype vector_signed_short is Low_Level_Vectors.LL_VSS;
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subtype vector_bool_short is Low_Level_Vectors.LL_VBS;
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subtype vector_unsigned_int is Low_Level_Vectors.LL_VUI;
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subtype vector_signed_int is Low_Level_Vectors.LL_VSI;
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subtype vector_bool_int is Low_Level_Vectors.LL_VBI;
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subtype vector_float is Low_Level_Vectors.LL_VF;
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subtype vector_pixel is Low_Level_Vectors.LL_VP;
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-- [PIM-2.1] shows groups of declarations with exact same component types,
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-- e.g. vector unsigned short together with vector unsigned short int. It
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-- so appears tempting to define subtypes for those matches here.
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--
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-- [PIM-2.1] does not qualify items in those groups as "the same types",
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-- though, and [PIM-2.4.2 Assignments] reads: "if either the left hand
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-- side or the right hand side of an expression has a vector type, then
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-- both sides of the expression must be of the same vector type".
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--
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-- Not so clear what is exactly right, then. We go with subtypes for now
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-- and can adjust later if need be.
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subtype vector_unsigned_short_int is vector_unsigned_short;
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subtype vector_signed_short_int is vector_signed_short;
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subtype vector_char is vector_signed_char;
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subtype vector_short is vector_signed_short;
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subtype vector_int is vector_signed_int;
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--------------------------------
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-- Corresponding access types --
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--------------------------------
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type vector_unsigned_char_ptr is access all vector_unsigned_char;
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type vector_signed_char_ptr is access all vector_signed_char;
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type vector_bool_char_ptr is access all vector_bool_char;
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type vector_unsigned_short_ptr is access all vector_unsigned_short;
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type vector_signed_short_ptr is access all vector_signed_short;
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type vector_bool_short_ptr is access all vector_bool_short;
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type vector_unsigned_int_ptr is access all vector_unsigned_int;
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type vector_signed_int_ptr is access all vector_signed_int;
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type vector_bool_int_ptr is access all vector_bool_int;
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type vector_float_ptr is access all vector_float;
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type vector_pixel_ptr is access all vector_pixel;
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--------------------------------------------------------------------
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-- Additional access types, for the sake of some argument passing --
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--------------------------------------------------------------------
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-- ... because some of the operations expect pointers to possibly
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-- constant objects.
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type const_vector_bool_char_ptr is access constant vector_bool_char;
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type const_vector_signed_char_ptr is access constant vector_signed_char;
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type const_vector_unsigned_char_ptr is access constant vector_unsigned_char;
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type const_vector_bool_short_ptr is access constant vector_bool_short;
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type const_vector_signed_short_ptr is access constant vector_signed_short;
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type const_vector_unsigned_short_ptr is access
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constant vector_unsigned_short;
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type const_vector_bool_int_ptr is access constant vector_bool_int;
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type const_vector_signed_int_ptr is access constant vector_signed_int;
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type const_vector_unsigned_int_ptr is access constant vector_unsigned_int;
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type const_vector_float_ptr is access constant vector_float;
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type const_vector_pixel_ptr is access constant vector_pixel;
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----------------------
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-- Useful shortcuts --
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----------------------
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subtype VUC is vector_unsigned_char;
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subtype VSC is vector_signed_char;
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subtype VBC is vector_bool_char;
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subtype VUS is vector_unsigned_short;
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subtype VSS is vector_signed_short;
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subtype VBS is vector_bool_short;
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subtype VUI is vector_unsigned_int;
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subtype VSI is vector_signed_int;
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subtype VBI is vector_bool_int;
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subtype VP is vector_pixel;
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subtype VF is vector_float;
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end GNAT.Altivec.Vector_Types;
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