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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) 2004-2005, 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 2,  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.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  19 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  20 -- MA 02111-1307, USA.                                                      --
  21 --                                                                          --
  22 -- As a special exception,  if other files  instantiate  generics from this --
  23 -- unit, or you link  this unit with other files  to produce an executable, --
  24 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  25 -- covered  by the  GNU  General  Public  License.  This exception does not --
  26 -- however invalidate  any other reasons why  the executable file  might be --
  27 -- covered by the  GNU Public License.                                      --
  28 --                                                                          --
  29 -- GNAT was originally developed  by the GNAT team at  New York University. --
  30 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 --  This unit exposes the various vector types part of the Ada binding to
  35 --  Altivec facilities.
  36
  37 with GNAT.Altivec.Low_Level_Vectors;
  38
  39 package GNAT.Altivec.Vector_Types is
  40
  41    use GNAT.Altivec.Low_Level_Vectors;
  42
  43    ---------------------------------------------------
  44    -- Vector type declarations [PIM-2.1 Data Types] --
  45    ---------------------------------------------------
  46
  47    --  Except for assignments and pointer creation/dereference, operations
  48    --  on vectors are only performed via subprograms. The vector types are
  49    --  then private, and non-limited since assignments are allowed.
  50
  51    --  The Hard/Soft binding type-structure differentiation is achieved in
  52    --  Low_Level_Vectors. Each version only exposes private vector types, that
  53    --  we just sub-type here. This is fine from the design standpoint and
  54    --  reduces the amount of explicit conversion required in various places
  55    --  internally.
  56
  57    subtype vector_unsigned_char is Low_Level_Vectors.LL_VUC;
  58    subtype vector_signed_char is Low_Level_Vectors.LL_VSC;
  59    subtype vector_bool_char is Low_Level_Vectors.LL_VBC;
  60
  61    subtype vector_unsigned_short is Low_Level_Vectors.LL_VUS;
  62    subtype vector_signed_short is Low_Level_Vectors.LL_VSS;
  63    subtype vector_bool_short is Low_Level_Vectors.LL_VBS;
  64
  65    subtype vector_unsigned_int is Low_Level_Vectors.LL_VUI;
  66    subtype vector_signed_int is Low_Level_Vectors.LL_VSI;
  67    subtype vector_bool_int is Low_Level_Vectors.LL_VBI;
  68
  69    subtype vector_float is Low_Level_Vectors.LL_VF;
  70    subtype vector_pixel is Low_Level_Vectors.LL_VP;
  71
  72    --  [PIM-2.1] shows groups of declarations with exact same component types,
  73    --  e.g. vector unsigned short together with vector unsigned short int. It
  74    --  so appears tempting to define subtypes for those matches here.
  75    --
  76    --  [PIM-2.1] does not qualify items in those groups as "the same types",
  77    --  though, and [PIM-2.4.2 Assignments] reads: "if either the left hand
  78    --  side or the right hand side of an expression has a vector type, then
  79    --  both sides of the expression must be of the same vector type".
  80    --
  81    --  Not so clear what is exactly right, then. We go with subtypes for now
  82    --  and can adjust later if need be.
  83
  84    subtype vector_unsigned_short_int is vector_unsigned_short;
  85    subtype vector_signed_short_int is vector_signed_short;
  86
  87    subtype vector_char is vector_signed_char;
  88    subtype vector_short is vector_signed_short;
  89    subtype vector_int is vector_signed_int;
  90
  91    --------------------------------
  92    -- Corresponding access types --
  93    --------------------------------
  94
  95    type vector_unsigned_char_ptr is access all vector_unsigned_char;
  96    type vector_signed_char_ptr is access all vector_signed_char;
  97    type vector_bool_char_ptr is access all vector_bool_char;
  98
  99    type vector_unsigned_short_ptr is access all vector_unsigned_short;
 100    type vector_signed_short_ptr is access all vector_signed_short;
 101    type vector_bool_short_ptr is access all vector_bool_short;
 102
 103    type vector_unsigned_int_ptr is access all vector_unsigned_int;
 104    type vector_signed_int_ptr is access all vector_signed_int;
 105    type vector_bool_int_ptr is access all vector_bool_int;
 106
 107    type vector_float_ptr is access all vector_float;
 108    type vector_pixel_ptr is access all vector_pixel;
 109
 110    --------------------------------------------------------------------
 111    -- Additional access types, for the sake of some argument passing --
 112    --------------------------------------------------------------------
 113
 114    --  ... because some of the operations expect pointers to possibly
 115    --  constant objects.
 116
 117    type const_vector_bool_char_ptr     is access constant vector_bool_char;
 118    type const_vector_signed_char_ptr   is access constant vector_signed_char;
 119    type const_vector_unsigned_char_ptr is access constant vector_unsigned_char;
 120
 121    type const_vector_bool_short_ptr     is access constant vector_bool_short;
 122    type const_vector_signed_short_ptr   is access constant vector_signed_short;
 123    type const_vector_unsigned_short_ptr is access
 124      constant vector_unsigned_short;
 125
 126    type const_vector_bool_int_ptr     is access constant vector_bool_int;
 127    type const_vector_signed_int_ptr   is access constant vector_signed_int;
 128    type const_vector_unsigned_int_ptr is access constant vector_unsigned_int;
 129
 130    type const_vector_float_ptr is access constant vector_float;
 131    type const_vector_pixel_ptr is access constant vector_pixel;
 132
 133    ----------------------
 134    -- Useful shortcuts --
 135    ----------------------
 136
 137    subtype VUC is vector_unsigned_char;
 138    subtype VSC is vector_signed_char;
 139    subtype VBC is vector_bool_char;
 140
 141    subtype VUS is vector_unsigned_short;
 142    subtype VSS is vector_signed_short;
 143    subtype VBS is vector_bool_short;
 144
 145    subtype VUI is vector_unsigned_int;
 146    subtype VSI is vector_signed_int;
 147    subtype VBI is vector_bool_int;
 148
 149    subtype VP is vector_pixel;
 150    subtype VF is vector_float;
 151
 152 end GNAT.Altivec.Vector_Types;