From 1bc5aee63eb72b341f506ad058502cd0361f0d10 Mon Sep 17 00:00:00 2001 From: Ben Cheng Date: Tue, 25 Mar 2014 22:37:19 -0700 Subject: Initial checkin of GCC 4.9.0 from trunk (r208799). Change-Id: I48a3c08bb98542aa215912a75f03c0890e497dba --- gcc-4.9/gcc/ada/s-exnint.adb | 70 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 70 insertions(+) create mode 100644 gcc-4.9/gcc/ada/s-exnint.adb (limited to 'gcc-4.9/gcc/ada/s-exnint.adb') diff --git a/gcc-4.9/gcc/ada/s-exnint.adb b/gcc-4.9/gcc/ada/s-exnint.adb new file mode 100644 index 000000000..bce8fd61c --- /dev/null +++ b/gcc-4.9/gcc/ada/s-exnint.adb @@ -0,0 +1,70 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT RUN-TIME COMPONENTS -- +-- -- +-- S Y S T E M . E X N _ I N T -- +-- -- +-- B o d y -- +-- -- +-- Copyright (C) 1992-2009 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 -- +-- . -- +-- -- +-- GNAT was originally developed by the GNAT team at New York University. -- +-- Extensive contributions were provided by Ada Core Technologies Inc. -- +-- -- +------------------------------------------------------------------------------ + +package body System.Exn_Int is + + ----------------- + -- Exn_Integer -- + ----------------- + + function Exn_Integer (Left : Integer; Right : Natural) return Integer is + pragma Suppress (Division_Check); + pragma Suppress (Overflow_Check); + + Result : Integer := 1; + Factor : Integer := Left; + Exp : Natural := Right; + + begin + -- We use the standard logarithmic approach, Exp gets shifted right + -- testing successive low order bits and Factor is the value of the + -- base raised to the next power of 2. + + -- Note: it is not worth special casing base values -1, 0, +1 since + -- the expander does this when the base is a literal, and other cases + -- will be extremely rare. + + if Exp /= 0 then + loop + if Exp rem 2 /= 0 then + Result := Result * Factor; + end if; + + Exp := Exp / 2; + exit when Exp = 0; + Factor := Factor * Factor; + end loop; + end if; + + return Result; + end Exn_Integer; + +end System.Exn_Int; -- cgit v1.2.3