Date: Tue, 4 Sep 2012 14:50:56 -0700 From: Garrett Cooper <yanegomi@gmail.com> To: Dimitry Andric <dimitry@andric.com> Cc: freebsd-current@freebsd.org Subject: Re: Compiler performance tests on FreeBSD 10.0-CURRENT Message-ID: <CAGH67wRziM1qujfPGGxsm9X9ZaHqDXVphLcJOgp_LMBODcaPRA@mail.gmail.com> In-Reply-To: <5046670C.6050500@andric.com> References: <5046670C.6050500@andric.com>
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On Tue, Sep 4, 2012 at 1:39 PM, Dimitry Andric <dimitry@andric.com> wrote: > Hi all, > > I recently performed a series of compiler performance tests on FreeBSD > 10.0-CURRENT, particularly comparing gcc 4.2.1 and gcc 4.7.1 against > clang 3.1 and clang 3.2. > > The attached text file[1] contains more information about the tests, > some semi-cooked performance data, and my conclusions. Any errors and > omissions are also my fault, so if you notice them, please let me know. > > The executive summary: clang compiles mostly faster than gcc (sometimes > much faster), and uses significantly less memory. > > Finally, please note these tests were purely about compilation speed, > not about the performance of the resulting executables. This still > needs to be tested. It would be interesting to see how clang++ performs vs g++ when dealing with nested classes and with complicated code when trying to optimize things because the optimizer in g++ apparently has some scaling issues. Thanks! -Garrett
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