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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;
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