GCC 6.2/7.0 vs. LLVM Clang 3.9/4.0 SVN Compiler Performance

With the FFTW workload, Clang continues to trail GCC and with Clang 4.0 SVN the performance appears to be slower than on the current LLVM Clang 3.9 stable.

Clang 4.0 SVN appears to regress with the HMMer workload too.

And for MAFFT, Clang 4.0 is currently regressed.

Same goes for the SciMark2 composite result.

But for SciMark2's Monte Carlo performance, Clang 4.0 is faster than 3.9 but still not to the speeds of GCC.

Clang 4.0 currently isn't looking too good for greater performance.