VP8 video encoding also had a slight benefit to the forthcoming version of the GNU Compiler Collection.
GCC 4.8 also ran slightly ahead with Himeno.
With 7-Zip compression, the latest Subversion code of LLVM/Clang is finally running ahead of GCC SVN on this x86 hardware.
The multi-threaded C-Ray ray-tracing performance was neck-and-neck between the two open-source compilers.
GCC wins for Smallpt since it's another program relying upon OpenMP where it's not currently supported by Apple's compiler.