There was an item on slashdot about LLVM project, have you tested it? On 6/14/10, Shlomi Fish <shlo...@iglu.org.il> wrote: > > ---------- Forwarded Message ---------- > > Subject: gcc-4.5.0 Success Story with Freecell Solver > Date: Sunday 13 Jun 2010, 17:21:00 > From: Shlomi Fish <shlo...@iglu.org.il> > To: Freecell Solving Discussions <fc-solve-disc...@yahoogroups.com> > > > Executive summary: I have built installed gcc-4.5.0 and after Freecell > Solver > ran faster, after I compiled it with gcc-4.5.0. > > I've recently gone over my LWN.net ( http://lwn.net/ ) backlog and saw this > feature about gcc-4.5.0: > > http://lwn.net/Articles/387122/ > > It mentioned the "Link-Time Optimisation" feature (using the -flto flag) > which > piqued my interest on how well it will work for Freecell Solver ( > http://fc-solve.berlios.de/ ). So I set out to try it out. > > I downloaded gcc-4.5.0 (which took a while due to the large archive size and > problems in finding a fast mirror), unpacked it, and read the INSTALL/ > notes. > After running the appropriate ./configure call, I typed make and waited. For > many hours. But it built up successfully, and I was able to install it. > > I used the following command, which I've stored in a shell script: > > [shell] > #!/bin/bash > ~/Download/unpack/prog/gcc/gcc-4.5.0/configure \ > --prefix="$HOME"/apps/prog/gcc-4.5.0 > [/shell] > > After installing gcc, I patched fc-solve's CMakeLists.txt to check for the > availability of the -flto flag and also enable it at link-time. This went > well, and I benchmarked Freecell Solver after being compiled with it. > > The end result was that it made the standard Microsoft FreeCell 32,000 > boards > benchmark take 91.0577080249786 seconds instead of 93.6305630207062 seconds > , > an improvement of over 2.5 seconds and of roughly 2.75%. (Going down to > 351.43 > boards per second). So it seems like an impressive gain. > > That was on my Pentium 4-2.4 GHz stationary machine running Mandriva Linux > Cooker. > > Then I set out to do the same on my newer Core Duo x86-64 laptop also > running > Mandriva Cooker. I installed gcc this time restricting the > --enable-languages > to c and c++ so it will take less time. After installing it in a prefix, I > realised CMake could not find its -flto flag . As it turns out, it was not > enabled because gcc-4.5.0 could not find libelf-devel. Installing it > resolved > it. > > The difference there was less dramatic than on my P4 machine - about 0.5 > seconds were saved out of about 35 seconds running time. However, in > general, > I'm happy with the results. > > Thanks to all the gcc developers for their hard work on making gcc better, > including improving the performance of many programs. > > Regards, > > Shlomi Fish > > -- > ----------------------------------------------------------------- > Shlomi Fish http://www.shlomifish.org/ > Original Riddles - http://www.shlomifish.org/puzzles/ > > God considered inflicting XSLT as the tenth plague of Egypt, but then > decided against it because he thought it would be too evil. > > Please reply to list if it's a mailing list post - http://shlom.in/reply . > > ----------------------------------------- > -- > ----------------------------------------------------------------- > Shlomi Fish http://www.shlomifish.org/ > http://www.shlomifish.org/humour/ways_to_do_it.html > > God considered inflicting XSLT as the tenth plague of Egypt, but then > decided against it because he thought it would be too evil. > > Please reply to list if it's a mailing list post - http://shlom.in/reply . > > _______________________________________________ > Linux-il mailing list > Linux-il@cs.huji.ac.il > http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il >
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