From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- gcc/ada/s-explli.adb | 83 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 83 insertions(+) create mode 100644 gcc/ada/s-explli.adb (limited to 'gcc/ada/s-explli.adb') diff --git a/gcc/ada/s-explli.adb b/gcc/ada/s-explli.adb new file mode 100644 index 000000000..b19aaf5bf --- /dev/null +++ b/gcc/ada/s-explli.adb @@ -0,0 +1,83 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT RUN-TIME COMPONENTS -- +-- -- +-- S Y S T E M . E X P L L I -- +-- -- +-- 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.Exp_LLI is + + --------------------------- + -- Exp_Long_Long_Integer -- + --------------------------- + + -- Note that negative exponents get a constraint error because the + -- subtype of the Right argument (the exponent) is Natural. + + function Exp_Long_Long_Integer + (Left : Long_Long_Integer; + Right : Natural) + return Long_Long_Integer + is + Result : Long_Long_Integer := 1; + Factor : Long_Long_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 + declare + pragma Unsuppress (All_Checks); + begin + Result := Result * Factor; + end; + end if; + + Exp := Exp / 2; + exit when Exp = 0; + + declare + pragma Unsuppress (All_Checks); + begin + Factor := Factor * Factor; + end; + end loop; + end if; + + return Result; + end Exp_Long_Long_Integer; + +end System.Exp_LLI; -- cgit v1.2.3