gcc/ada/libgnat/s-vector.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --
   4 --                                                                          --
   5 --                       S Y S T E M . V E C T O R S                        --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 2002-2017, 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 package defines a datatype which is most efficient for performing
  33 --  logical operations on large arrays. See System.Generic_Vector_Operations.
  34
  35 --  In the future this package may also define operations such as element-wise
  36 --  addition, subtraction, multiplication, minimum and maximum of vector-sized
  37 --  packed arrays of Unsigned_8, Unsigned_16 and Unsigned_32 values. These
  38 --  operations could be implemented as system intrinsics on platforms with
  39 --  direct processor support for them.
  40
  41 package System.Vectors is
  42    pragma Pure;
  43
  44    type Vector is mod 2**System.Word_Size;
  45    for Vector'Alignment use Integer'Min
  46      (Standard'Maximum_Alignment, System.Word_Size / System.Storage_Unit);
  47    for Vector'Size use System.Word_Size;
  48
  49 end System.Vectors;