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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 package is the root of a set aimed at offering Ada bindings to a
-- subset of the Intel(r) Streaming SIMD Extensions with GNAT. 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.
-- Assuming actual hardware support is available, this capability is
-- currently supported on the following set of targets:
-- GNU/Linux x86 and x86_64
-- Windows XP/Vista x86 and x86_64
-- This unit exposes vector _component_ types together with general comments
-- on the binding contents.
-- One other unit is offered as of today: GNAT.SSE.Vector_Types, which
-- exposes Ada types corresponding to the reference types (__m128 and the
-- like) over which a binding to the SSE GCC builtins may 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, GNAT.SSE.Vector_Types;
-- procedure SSE_Base is
-- -- Core operations
-- function ia32_addps (A, B : m128) return m128;
-- pragma Import (Intrinsic, ia32_addps, "__builtin_ia32_addps");
-- -- User views & conversions
-- type Vf32_View is array (1 .. 4) of GNAT.SSE.Float32;
-- for Vf32_View'Alignment use VECTOR_ALIGN;
-- function To_m128 is new Ada.Unchecked_Conversion (Vf32_View, m128);
-- Xf32 : constant Vf32_View := (1.0, 1.0, 2.0, 2.0);
-- Yf32 : constant Vf32_View := (2.0, 2.0, 1.0, 1.0);
-- X128 : constant m128 := To_m128 (Xf32);
-- Y128 : constant m128 := To_m128 (Yf32);
-- begin
-- -- Operations & overlays
-- declare
-- Z128 : m128;
-- Zf32 : Vf32_View;
-- for Zf32'Address use Z128'Address;
-- begin
-- Z128 := ia32_addps (X128, Y128);
-- if Zf32 /= (3.0, 3.0, 3.0, 3.0) then
-- raise Program_Error;
-- end if;
-- end;
-- declare
-- type m128_View_Kind is (SSE, F32);
-- type m128_Object (View : m128_View_Kind := F32) is record
-- case View is
-- when SSE => V128 : m128;
-- when F32 => Vf32 : Vf32_View;
-- end case;
-- end record;
-- pragma Unchecked_Union (m128_Object);
-- O1 : constant m128_Object := (View => SSE, V128 => X128);
-- begin
-- if O1.Vf32 /= Xf32 then
-- raise Program_Error;
-- end if;
-- end;
-- end SSE_Base;
package GNAT.SSE is
-----------------------------------
-- Common vector characteristics --
-----------------------------------
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.
----------------------------
-- Vector component types --
----------------------------
type Float32 is new Float;
type Float64 is new Long_Float;
type Integer64 is new Long_Long_Integer;
end GNAT.SSE;
|
