106 lines
4.9 KiB
Ada
106 lines
4.9 KiB
Ada
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------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- G N A T . S S E . V E C T O R _ T Y P E S --
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-- --
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-- S p e c --
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-- --
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-- Copyright (C) 2009, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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-- This unit exposes the Ada __m128 like data types to represent the contents
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-- of SSE registers, for use by bindings to the SSE intrinsic operations.
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-- See GNAT.SSE for the list of targets where this facility is supported
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package GNAT.SSE.Vector_Types is
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-- The reference guide states a few usage guidelines for the C types:
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-- Since these new data types are not basic ANSI C data types, you
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-- must observe the following usage restrictions:
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--
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-- * Use new data types only on either side of an assignment, as a
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-- return value, or as a parameter. You cannot use it with other
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-- arithmetic expressions ("+", "-", and so on).
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--
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-- * Use new data types as objects in aggregates, such as unions to
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-- access the byte elements and structures.
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--
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-- * Use new data types only with the respective intrinsics described
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-- in this documentation.
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type m128 is private; -- SSE >= 1
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type m128d is private; -- SSE >= 2
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type m128i is private; -- SSE >= 2
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private
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-- Each of the m128 types maps to a specific vector_type with an extra
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-- "may_alias" attribute as in GCC's definitions for C, for instance in
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-- xmmintrin.h:
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-- /* The Intel API is flexible enough that we must allow aliasing
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-- with other vector types, and their scalar components. */
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-- typedef float __m128
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-- __attribute__ ((__vector_size__ (16), __may_alias__));
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-- /* Internal data types for implementing the intrinsics. */
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-- typedef float __v4sf __attribute__ ((__vector_size__ (16)));
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------------
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-- m128 --
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------------
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-- The __m128 data type can hold four 32-bit floating-point values
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type m128 is array (1 .. 4) of Float32;
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for m128'Alignment use VECTOR_ALIGN;
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pragma Machine_Attribute (m128, "vector_type");
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pragma Machine_Attribute (m128, "may_alias");
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-------------
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-- m128d --
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-------------
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-- The __m128d data type can hold two 64-bit floating-point values
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type m128d is array (1 .. 2) of Float64;
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for m128d'Alignment use VECTOR_ALIGN;
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pragma Machine_Attribute (m128d, "vector_type");
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pragma Machine_Attribute (m128d, "may_alias");
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-------------
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-- m128i --
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-------------
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-- The __m128i data type can hold sixteen 8-bit, eight 16-bit, four 32-bit,
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-- or two 64-bit integer values.
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type m128i is array (1 .. 2) of Integer64;
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for m128i'Alignment use VECTOR_ALIGN;
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pragma Machine_Attribute (m128i, "vector_type");
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pragma Machine_Attribute (m128i, "may_alias");
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end GNAT.SSE.Vector_Types;
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