Re: Patches to compile the kernel with Intel's C/C++ compiler

From: Alexander Leidinger (Alexander_at_Leidinger.net)
Date: 11/11/03

  • Next message: Mark Linimon: "Re: Patches to compile the kernel with Intel's C/C++ compiler" 
    Date: Tue, 11 Nov 2003 18:08:39 +0100
To: freebsd-arch@freebsd.org

    On Tue, 11 Nov 2003 16:43:02 +0100
    Morten Rodal <morten@rodal.no> wrote:

    > The Intel C compiler is known to generate far better code for the
    > Pentium 4 processor family (and more likely the Itanium processors), and
    > probably others as well. It certanly beats gcc in most benchmark tests
    > and other scientific applications.

    It depends on the benchmarks you do and if they are optimized for a
    specific compiler or not (I don't want to implicate, that those
    benchmarks which show a large benefit for icc to be optimized for icc,
    generally I think icc produces better code than gcc, but as usual, this
    depends on the used code and the used data which gets processed (you
    know: benchmarks data != real world data you are confronted with) and
    many more factors than only the compiler).

    > I have found that icc generates far more, and more accurate, warnings
    > and errors for programs and this is probably what the FreeBSD kernel
    > could benefit most from. Having more than one compiler helps the
    > developers find bugs faster.

    Yes, it produces nice warnings. If some is interested (and isn't willing
    to download the >60 MB icc tarball) I can put up the log of a compiled
    GENERIC or LINT kernel (or a subsystem) for download. This isn't the
    same as seeing the warnings/errors at development time, but I think
    could be still usable.

    Bye,
    Alexander. 

    -- 
              The best things in life are free, but the
                expensive ones are still worth a look.
http://www.Leidinger.net                       Alexander @ Leidinger.net
  GPG fingerprint = C518 BC70 E67F 143F BE91  3365 79E2 9C60 B006 3FE7
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