62 Benchmarks, 12 Systems, 4 Compilers: Our Most Extensive Benchmarks Yet Of GCC vs. Clang Performance

The BLAKE2 crypto benchmark was one of the cases where Clang was easily beating out GCC on nearly all of the configurations.

The SciMark2 benchmarks always tend to be quite susceptible to compiler changes and in some cases like Jacobi, GCC is performing much faster than Clang.

Clang was generating faster code over GCC on the twelve systems with the TSCP chess benchmark.

On the AMD Zen systems, the Clang-generated binary for VP9 vpxenc video encoding was slightly faster while the Intel performance was close between these compilers. The exception on the Intel side was the Intel Core i9 7980XE with seeing measurably better performance using GCC.

With the H.264/H.265 video encode tests among other video coding benchmarks there isn't too much change with most of the programs/libraries relying upon hand-tuned Assembly code already. But in the case of the x265 benchmark, the AVX512-enabled Xeon Silver and Core i9 Skylake-X processors were yielding better performance on GCC.