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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;
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