[llvm-dev] llvm and clang are getting slower

[Jack Howarth via llvm-dev]

Honza recently posted some benchmarks for building libreoffice with
GCC 6 and LTO and found a similar compile time regression for recent
llvm trunk...

http://hubicka.blogspot.nl/2016/03/building-libreoffice-with-gcc-6-and-lto.html#more

Compared to llvm 3.5,0. the builds with llvm 3.9.0 svn were 24% slower.


On Tue, Mar 8, 2016 at 11:13 AM, Rafael Espíndola
<llvm-dev at lists.llvm.org> wrote:
> I have just benchmarked building trunk llvm and clang in Debug,
> Release and LTO modes (see the attached scrip for the cmake lines).
>
> The compilers used were clang 3.5, 3.6, 3.7, 3.8 and trunk. In all
> cases I used the system libgcc and libstdc++.
>
> For release builds there is a monotonic increase in each version. From
> 163 minutes with 3.5 to 212 minutes with trunk. For comparison, gcc
> 5.3.2 takes 205 minutes.
>
> Debug and LTO show an improvement in 3.7, but have regressed again in 3.8.
>
> Cheers,
> Rafael
>
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