Clang 3.4 Performance Very Strong Against GCC 4.9
The BLAKE2 performance improvement in Clang 3.4 now puts the compiler performance in line with GCC 4.8.2, which is still on the same level with GCC 4.9 SVN.
The AES-256 performance in Botan is beating out GCC 4.8.2. GCC 4.9.0 failed to build under the Botan 1.10.3 stable release.
The other Botan crypto benchmarks were mixed but overall LLVM Clang 3.4 is having a competitive showing against GCC 4.8.2. GCC 4.9 will be officially released in H1'2014.
With the Clang 3.4 gains made in the C-written SciMark2 test cases, Clang 3.4 is now much faster than GCC 4.8.2 and even the GCC 4.9.0 development compiler.