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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;