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------------------------------------------------------------------------------ -- -- -- GNAT RUN-TIME COMPONENTS -- -- -- -- G N A T . B Y T E _ S W A P P I N G -- -- -- -- B o d y -- -- -- -- Copyright (C) 2006-2007, AdaCore -- -- -- -- 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 2, 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. See the GNU General Public License -- -- for more details. You should have received a copy of the GNU General -- -- Public License distributed with GNAT; see file COPYING. If not, write -- -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, -- -- Boston, MA 02110-1301, USA. -- -- -- -- As a special exception, if other files instantiate generics from this -- -- unit, or you link this unit with other files to produce an executable, -- -- this unit does not by itself cause the resulting executable to be -- -- covered by the GNU General Public License. This exception does not -- -- however invalidate any other reasons why the executable file might be -- -- covered by the GNU Public License. -- -- -- -- GNAT was originally developed by the GNAT team at New York University. -- -- Extensive contributions were provided by Ada Core Technologies Inc. -- -- -- ------------------------------------------------------------------------------ -- This is a machine-specific version of this package. -- It uses instructions available on Intel 486 processors (or later). with Interfaces; use Interfaces; with System.Machine_Code; use System.Machine_Code; with Ada.Unchecked_Conversion; package body GNAT.Byte_Swapping is ----------------------- -- Local Subprograms -- ----------------------- function Swapped32 (Value : Unsigned_32) return Unsigned_32; pragma Inline_Always (Swapped32); -------------- -- Swapped2 -- -------------- function Swapped2 (Input : Item) return Item is function As_U16 is new Ada.Unchecked_Conversion (Source => Item, Target => Unsigned_16); function As_Item is new Ada.Unchecked_Conversion (Source => Unsigned_16, Target => Item); X : Unsigned_16 := As_U16 (Input); begin Asm ("xchgb %b0,%h0", Unsigned_16'Asm_Output ("=q", X), Unsigned_16'Asm_Input ("0", X)); return As_Item (X); end Swapped2; -------------- -- Swapped4 -- -------------- function Swapped4 (Input : Item) return Item is function As_U32 is new Ada.Unchecked_Conversion (Source => Item, Target => Unsigned_32); function As_Item is new Ada.Unchecked_Conversion (Source => Unsigned_32, Target => Item); X : Unsigned_32 := As_U32 (Input); begin Asm ("bswap %0", Unsigned_32'Asm_Output ("=r", X), Unsigned_32'Asm_Input ("0", X)); return As_Item (X); end Swapped4; -------------- -- Swapped8 -- -------------- function Swapped8 (Input : Item) return Item is function As_U64 is new Ada.Unchecked_Conversion (Source => Item, Target => Unsigned_64); X : constant Unsigned_64 := As_U64 (Input); type Two_Words is array (0 .. 1) of Unsigned_32; for Two_Words'Component_Size use Unsigned_32'Size; function As_Item is new Ada.Unchecked_Conversion (Source => Two_Words, Target => Item); Result : Two_Words; begin Asm ("xchgl %0,%1", Outputs => (Unsigned_32'Asm_Output ("=r", Result (0)), Unsigned_32'Asm_Output ("=r", Result (1))), Inputs => (Unsigned_32'Asm_Input ("0", Swapped32 (Unsigned_32 (X and 16#0000_0000_FFFF_FFFF#))), Unsigned_32'Asm_Input ("1", Swapped32 (Unsigned_32 (Shift_Right (X, 32)))))); return As_Item (Result); end Swapped8; ----------- -- Swap2 -- ----------- procedure Swap2 (Location : System.Address) is X : Unsigned_16; for X'Address use Location; begin Asm ("xchgb %b0,%h0", Unsigned_16'Asm_Output ("=q", X), Unsigned_16'Asm_Input ("0", X)); end Swap2; ----------- -- Swap4 -- ----------- procedure Swap4 (Location : System.Address) is X : Unsigned_32; for X'Address use Location; begin Asm ("bswap %0", Unsigned_32'Asm_Output ("=r", X), Unsigned_32'Asm_Input ("0", X)); end Swap4; --------------- -- Swapped32 -- --------------- function Swapped32 (Value : Unsigned_32) return Unsigned_32 is X : Unsigned_32 := Value; begin Asm ("bswap %0", Unsigned_32'Asm_Output ("=r", X), Unsigned_32'Asm_Input ("0", X)); return X; end Swapped32; ----------- -- Swap8 -- ----------- procedure Swap8 (Location : System.Address) is X : Unsigned_64; for X'Address use Location; type Two_Words is array (0 .. 1) of Unsigned_32; for Two_Words'Component_Size use Unsigned_32'Size; Words : Two_Words; for Words'Address use Location; begin Asm ("xchgl %0,%1", Outputs => (Unsigned_32'Asm_Output ("=r", Words (0)), Unsigned_32'Asm_Output ("=r", Words (1))), Inputs => (Unsigned_32'Asm_Input ("0", Swapped32 (Unsigned_32 (X and 16#0000_0000_FFFF_FFFF#))), Unsigned_32'Asm_Input ("1", Swapped32 (Unsigned_32 (Shift_Right (X, 32)))))); end Swap8; end GNAT.Byte_Swapping;