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   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --            G N A T . A L T I V E C . V E C T O R _ T Y P E S             --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 2004-2009, Free Software Foundation, Inc.         --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 3,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  21 --                                                                          --
  22 -- You should have received a copy of the GNU General Public License and    --
  23 -- a copy of the GCC Runtime Library Exception along with this program;     --
  24 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  25 -- <http://www.gnu.org/licenses/>.                                          --
  26 --                                                                          --
  27 -- GNAT was originally developed  by the GNAT team at  New York University. --
  28 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  29 --                                                                          --
  30 ------------------------------------------------------------------------------
  31
  32 --  This unit exposes the various vector types part of the Ada binding to
  33 --  Altivec facilities.
  34
  35 with GNAT.Altivec.Low_Level_Vectors;
  36
  37 package GNAT.Altivec.Vector_Types is
  38
  39    use GNAT.Altivec.Low_Level_Vectors;
  40
  41    ---------------------------------------------------
  42    -- Vector type declarations [PIM-2.1 Data Types] --
  43    ---------------------------------------------------
  44
  45    --  Except for assignments and pointer creation/dereference, operations
  46    --  on vectors are only performed via subprograms. The vector types are
  47    --  then private, and non-limited since assignments are allowed.
  48
  49    --  The Hard/Soft binding type-structure differentiation is achieved in
  50    --  Low_Level_Vectors. Each version only exposes private vector types, that
  51    --  we just sub-type here. This is fine from the design standpoint and
  52    --  reduces the amount of explicit conversion required in various places
  53    --  internally.
  54
  55    subtype vector_unsigned_char is Low_Level_Vectors.LL_VUC;
  56    subtype vector_signed_char is Low_Level_Vectors.LL_VSC;
  57    subtype vector_bool_char is Low_Level_Vectors.LL_VBC;
  58
  59    subtype vector_unsigned_short is Low_Level_Vectors.LL_VUS;
  60    subtype vector_signed_short is Low_Level_Vectors.LL_VSS;
  61    subtype vector_bool_short is Low_Level_Vectors.LL_VBS;
  62
  63    subtype vector_unsigned_int is Low_Level_Vectors.LL_VUI;
  64    subtype vector_signed_int is Low_Level_Vectors.LL_VSI;
  65    subtype vector_bool_int is Low_Level_Vectors.LL_VBI;
  66
  67    subtype vector_float is Low_Level_Vectors.LL_VF;
  68    subtype vector_pixel is Low_Level_Vectors.LL_VP;
  69
  70    --  [PIM-2.1] shows groups of declarations with exact same component types,
  71    --  e.g. vector unsigned short together with vector unsigned short int. It
  72    --  so appears tempting to define subtypes for those matches here.
  73    --
  74    --  [PIM-2.1] does not qualify items in those groups as "the same types",
  75    --  though, and [PIM-2.4.2 Assignments] reads: "if either the left hand
  76    --  side or the right hand side of an expression has a vector type, then
  77    --  both sides of the expression must be of the same vector type".
  78    --
  79    --  Not so clear what is exactly right, then. We go with subtypes for now
  80    --  and can adjust later if need be.
  81
  82    subtype vector_unsigned_short_int is vector_unsigned_short;
  83    subtype vector_signed_short_int is vector_signed_short;
  84
  85    subtype vector_char is vector_signed_char;
  86    subtype vector_short is vector_signed_short;
  87    subtype vector_int is vector_signed_int;
  88
  89    --------------------------------
  90    -- Corresponding access types --
  91    --------------------------------
  92
  93    type vector_unsigned_char_ptr is access all vector_unsigned_char;
  94    type vector_signed_char_ptr is access all vector_signed_char;
  95    type vector_bool_char_ptr is access all vector_bool_char;
  96
  97    type vector_unsigned_short_ptr is access all vector_unsigned_short;
  98    type vector_signed_short_ptr is access all vector_signed_short;
  99    type vector_bool_short_ptr is access all vector_bool_short;
 100
 101    type vector_unsigned_int_ptr is access all vector_unsigned_int;
 102    type vector_signed_int_ptr is access all vector_signed_int;
 103    type vector_bool_int_ptr is access all vector_bool_int;
 104
 105    type vector_float_ptr is access all vector_float;
 106    type vector_pixel_ptr is access all vector_pixel;
 107
 108    --------------------------------------------------------------------
 109    -- Additional access types, for the sake of some argument passing --
 110    --------------------------------------------------------------------
 111
 112    --  ... because some of the operations expect pointers to possibly
 113    --  constant objects.
 114
 115    type const_vector_bool_char_ptr     is access constant vector_bool_char;
 116    type const_vector_signed_char_ptr   is access constant vector_signed_char;
 117    type const_vector_unsigned_char_ptr is access constant vector_unsigned_char;
 118
 119    type const_vector_bool_short_ptr     is access constant vector_bool_short;
 120    type const_vector_signed_short_ptr   is access constant vector_signed_short;
 121    type const_vector_unsigned_short_ptr is access
 122      constant vector_unsigned_short;
 123
 124    type const_vector_bool_int_ptr     is access constant vector_bool_int;
 125    type const_vector_signed_int_ptr   is access constant vector_signed_int;
 126    type const_vector_unsigned_int_ptr is access constant vector_unsigned_int;
 127
 128    type const_vector_float_ptr is access constant vector_float;
 129    type const_vector_pixel_ptr is access constant vector_pixel;
 130
 131    ----------------------
 132    -- Useful shortcuts --
 133    ----------------------
 134
 135    subtype VUC is vector_unsigned_char;
 136    subtype VSC is vector_signed_char;
 137    subtype VBC is vector_bool_char;
 138
 139    subtype VUS is vector_unsigned_short;
 140    subtype VSS is vector_signed_short;
 141    subtype VBS is vector_bool_short;
 142
 143    subtype VUI is vector_unsigned_int;
 144    subtype VSI is vector_signed_int;
 145    subtype VBI is vector_bool_int;
 146
 147    subtype VP is vector_pixel;
 148    subtype VF is vector_float;
 149
 150 end GNAT.Altivec.Vector_Types;