aboutsummaryrefslogtreecommitdiffstats
path: root/gcc-4.8.3/gcc/ada/g-bytswa.adb
diff options
context:
space:
mode:
Diffstat (limited to 'gcc-4.8.3/gcc/ada/g-bytswa.adb')
-rw-r--r--gcc-4.8.3/gcc/ada/g-bytswa.adb113
1 files changed, 113 insertions, 0 deletions
diff --git a/gcc-4.8.3/gcc/ada/g-bytswa.adb b/gcc-4.8.3/gcc/ada/g-bytswa.adb
new file mode 100644
index 000000000..9628bbc5d
--- /dev/null
+++ b/gcc-4.8.3/gcc/ada/g-bytswa.adb
@@ -0,0 +1,113 @@
+------------------------------------------------------------------------------
+-- --
+-- 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) 2006-2012, 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 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 is a general implementation that uses GCC intrinsics to take
+-- advantage of any machine-specific instructions.
+
+with Ada.Unchecked_Conversion; use Ada;
+
+with System.Byte_Swapping; use System.Byte_Swapping;
+
+package body GNAT.Byte_Swapping is
+
+ --------------
+ -- Swapped2 --
+ --------------
+
+ function Swapped2 (Input : Item) return Item is
+ function As_U16 is new Unchecked_Conversion (Item, U16);
+ function As_Item is new Unchecked_Conversion (U16, Item);
+ pragma Compile_Time_Error (Item'Max_Size_In_Storage_Elements /= 2,
+ "storage size must be 2 bytes");
+ begin
+ return As_Item (Bswap_16 (As_U16 (Input)));
+ end Swapped2;
+
+ --------------
+ -- Swapped4 --
+ --------------
+
+ function Swapped4 (Input : Item) return Item is
+ function As_U32 is new Unchecked_Conversion (Item, U32);
+ function As_Item is new Unchecked_Conversion (U32, Item);
+ pragma Compile_Time_Error (Item'Max_Size_In_Storage_Elements /= 4,
+ "storage size must be 4 bytes");
+ begin
+ return As_Item (Bswap_32 (As_U32 (Input)));
+ end Swapped4;
+
+ --------------
+ -- Swapped8 --
+ --------------
+
+ function Swapped8 (Input : Item) return Item is
+ function As_U64 is new Unchecked_Conversion (Item, U64);
+ function As_Item is new Unchecked_Conversion (U64, Item);
+ pragma Compile_Time_Error (Item'Max_Size_In_Storage_Elements /= 8,
+ "storage size must be 8 bytes");
+ begin
+ return As_Item (Bswap_64 (As_U64 (Input)));
+ end Swapped8;
+
+ -----------
+ -- Swap2 --
+ -----------
+
+ procedure Swap2 (Location : System.Address) is
+ X : U16;
+ for X'Address use Location;
+ begin
+ X := Bswap_16 (X);
+ end Swap2;
+
+ -----------
+ -- Swap4 --
+ -----------
+
+ procedure Swap4 (Location : System.Address) is
+ X : U32;
+ for X'Address use Location;
+ begin
+ X := Bswap_32 (X);
+ end Swap4;
+
+ -----------
+ -- Swap8 --
+ -----------
+
+ procedure Swap8 (Location : System.Address) is
+ X : U64;
+ for X'Address use Location;
+ begin
+ X := Bswap_64 (X);
+ end Swap8;
+
+end GNAT.Byte_Swapping;