GCC vs. LLVM/Clang On The AMD Richland APU

For the most part with the Botan cryptography tests there wasn't a big performance difference between GCC 4.8.1 and LLVM/Clang 3.3. However, with the AES-256 and CAST-256 standards, the LLVM/Clang 3.3 binary was much faster on this AMD APU bearing Piledriver cores.

GCC 4.8.1 had its only Botan win with the X9.19-MAC test.

LLVM/Clang 3.3 was a great performer for SciMark 2.0 with the -O3 and -march=bdver2 compiler flags.