[cfe-dev] Using the new clang driver
zhpalt at gmail.com
Sun Mar 29 10:11:42 CDT 2009
why real is shorter than sys in the result of time?
2009/3/29 Török Edwin <edwintorok at gmail.com>
> I tested the new clang driver, and I am very pleased with the results.
> Nice job!
> Here are the results when building ClamAV with a default ./configure
> (which sets CFLAGS to -O2 -g),
> and running time make -j4 >/dev/null:
> gcc-4.3: real 0m19.615s user 0m53.727s sys 0m5.800s
> ccc: real 0m16.736s user 0m39.726s sys 0m7.596s
> clang: real 0m13.786s user 0m33.142s sys 0m5.136s
> llvm-gcc: real 0m13.046s user 0m32.662s sys 0m5.332s
> ccache+gcc: real 0m4.703s user 0m6.936s sys 0m3.380s
> As you can see clang is now almost as fast llvm-gcc, and definitely
> faster than gcc, and the old ccc driver.
> I'm a bit surprised that clang isn't faster than llvm-gcc, but I think
> most of the time is spent in the optimizers/codegen
> and not in parsing (this is a C application, includes are not as huge as
> for C++).
> Best regards,
> cfe-dev mailing list
> cfe-dev at cs.uiuc.edu
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