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--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                 G N A T . S S E . V E C T O R _ T Y P E S                --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

--             Copyright (C) 2009, Free Software Foundation, Inc.           --

--                                                                          --

-- GNAT is free software;  you can  redistribute it  and/or modify it under --

-- terms of the  GNU General Public License as published  by the Free Soft- --

-- ware  Foundation;  either version 3,  or (at your option) any later ver- --

-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --

-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --

-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --

--                                                                          --

-- As a special exception under Section 7 of GPL version 3, you are granted --

-- additional permissions described in the GCC Runtime Library Exception,   --

-- version 3.1, as published by the Free Software Foundation.               --

--                                                                          --

-- You should have received a copy of the GNU General Public License and    --

-- a copy of the GCC Runtime Library Exception along with this program;     --

-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --

-- <http://www.gnu.org/licenses/>.                                          --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

------------------------------------------------------------------------------

--  This unit exposes the Ada __m128 like data types to represent the contents

--  of SSE registers, for use by bindings to the SSE intrinsic operations.

--  See GNAT.SSE for the list of targets where this facility is supported

package GNAT.SSE.Vector_Types is

   --  The reference guide states a few usage guidelines for the C types:

   --    Since these new data types are not basic ANSI C data types, you

   --    must observe the following usage restrictions:

   --

   --     * Use new data types only on either side of an assignment, as a

   --       return value, or as a parameter. You cannot use it with other

   --       arithmetic expressions ("+", "-", and so on).

   --

   --     * Use new data types as objects in aggregates, such as unions to

   --       access the byte elements and structures.

   --

   --     * Use new data types only with the respective intrinsics described

   --       in this documentation.

   type m128  is private;  --  SSE >= 1

   type m128d is private;  --  SSE >= 2

   type m128i is private;  --  SSE >= 2

private

   --  Each of the m128 types maps to a specific vector_type with an extra

   --  "may_alias" attribute as in GCC's definitions for C, for instance in

   --  xmmintrin.h:

   --  /* The Intel API is flexible enough that we must allow aliasing

   --     with other vector types, and their scalar components.  */

   --  typedef float __m128

   --    __attribute__ ((__vector_size__ (16), __may_alias__));

   --  /* Internal data types for implementing the intrinsics.  */

   --  typedef float __v4sf __attribute__ ((__vector_size__ (16)));

   ------------

   --  m128  --

   ------------

   --  The __m128 data type can hold four 32-bit floating-point values

   type m128 is array (1 .. 4) of Float32;

   for m128'Alignment use VECTOR_ALIGN;

   pragma Machine_Attribute (m128, "vector_type");

   pragma Machine_Attribute (m128, "may_alias");

   -------------

   --  m128d  --

   -------------

   --  The __m128d data type can hold two 64-bit floating-point values

   type m128d is array (1 .. 2) of Float64;

   for m128d'Alignment use VECTOR_ALIGN;

   pragma Machine_Attribute (m128d, "vector_type");

   pragma Machine_Attribute (m128d, "may_alias");

   -------------

   --  m128i  --

   -------------

   --  The __m128i data type can hold sixteen 8-bit, eight 16-bit, four 32-bit,

   --  or two 64-bit integer values.

   type m128i is array (1 .. 2) of Integer64;

   for m128i'Alignment use VECTOR_ALIGN;

   pragma Machine_Attribute (m128i, "vector_type");

   pragma Machine_Attribute (m128i, "may_alias");

end GNAT.SSE.Vector_Types;