Ryzen Compiler Performance: Clang 4/5 vs. GCC 6/7/8 Benchmarks
With the TSCP chess benchmark, znver1 tuning helped the GCC scores but they did come up shy of LLVM Clang.
Clang was also slightly faster with its x264 runs.
While GCC did much better than Clang with the OpenMP GraphicsMagick benchmark. At least Clang's OpenMP support is much better off than where it was years ago.