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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- G N A T . S S E --
-- --
-- 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 is the root of a set aimed at offering Ada bindings to a subset
-- of the Intel(r) Streaming SIMD Extensions with GNAT. It exposes vector
-- _component_ types together with general comments on the binding contents.
-- The purpose is to allow access from Ada to the SSE facilities defined in
-- the Intel(r) compiler manuals, in particular in the Intrinsics Reference
-- of the C++ Compiler User's Guide, available from http://www.intel.com.
-- As of today, essentially one unit is offered: GNAT.SSE.Vector__Types,
-- which exposes Ada types corresponding to the reference types (__m128 and
-- the like) over which GCC builtins will operate.
-- The exposed Ada types are private. Object initializations or value
-- observations may be performed with unchecked conversions or address
-- overlays, for example:
-- with Ada.Unchecked_Conversion;
-- with GNAT.SSE.Vector_Types; use GNAT.SSE; use GNAT.SSE.Vector_Types;
-- procedure SSE_Base is
-- -- Core operations
-- function mm_add_ss (A, B : M128) return M128;
-- pragma Import (Intrinsic, mm_add_ss, "__builtin_ia32_addss");
-- -- User views / conversions or overlays
-- type Vf32_View is array (1 .. 4) of Float;
-- for Vf32_View'Alignment use VECTOR_ALIGN;
-- function To_M128 is new Ada.Unchecked_Conversion (Vf32_View, M128);
-- X, Y, Z : M128;
-- Vz : Vf32_View;
-- for Vz'Address use Z'Address;
-- begin
-- X := To_M128 ((1.0, 1.0, 2.0, 2.0));
-- Y := To_M128 ((2.0, 2.0, 1.0, 1.0));
-- Z := mm_add_ss (X, Y);
-- if vz /= (3.0, 1.0, 2.0, 2.0) then
-- raise Program_Error;
-- end if;
-- end;
-- Use of Unchecked_Union is very tempting, however hits difficulties with
-- e.g. implicit front-end expanded equality operators, which typically
-- feature a subcase comparing the m128 components, not supported by the
-- middle-end. This needs more explanation, should it be fixed ??? It
-- reads like a bug in this paragraph.
package GNAT.SSE is
type Float32 is new Float;
type Float64 is new Long_Float;
type Integer64 is new Long_Long_Integer;
VECTOR_BYTES : constant := 16;
-- Common size of all the SSE vector types, in bytes.
VECTOR_ALIGN : constant := 16;
-- Common alignment of all the SSE vector types, in bytes.
-- Alignment-wise, the reference document reads:
-- << The compiler aligns __m128d and _m128i local and global data to
-- 16-byte boundaries on the stack. >>
--
-- We apply that consistently to all the Ada vector types, as GCC does
-- for the corresponding C types.
end GNAT.SSE;
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