A Look At The GCC 9 Performance On Intel Skylake Against GCC 8, LLVM Clang 7/8

With the HPCG test, Clang was delivering slightly faster than GCC: about 6% faster performance on the Core i9 7980XE.

The FFTW performance sided with the GCC compiler and here the GCC9 compiler had a very slight performance advantage over the current GCC 8.2 stable release.

In the case of the HMMer molecular biology benchmark, Clang scored another win over GCC.

The BLAKE2 crypto test also pocketed another minor win for Clang.

With the basic SciMark2 C benchmarks, the Monte Carlo performance was much faster with the GCC generated code over Clang.

While in the FFT and dense LU tests, Clang delivered slightly faster x86_64 code.

GCC rounded out the SciMark2 benchmarks with a strong win over Clang in the Jacobi test case.