LLVM Clang 3.7 vs. GCC Compiler Benchmarks On Linux
With the Himeno scientific test, Clang remains slower than the latest versions of GCC.
Clang still leads GCC when it comes to providing faster compile times.
Clang isn't yet as well-tuned as GCC for the C-Ray multi-threaded ray-tracer.
There wasn't any real difference in performance for the Bullet Physics library under the different compilers.