LLVM/Clang 3.3 Very Competitive To GCC 4.8
LLVM/Clang 3.3 was also a winner for the CAST-256 test.
For some of the Botan tests, the compiler performance is rather indifferent.
GCC remains much faster than LLVM/Clang in a number of the benchmarks due to OpenMP not yet being supported in mainline by LLVM.