GCC 4.8 vs. LLVM/Clang 3.3 On Intel’s Core i7 4770K

Complementing the earlier Phoronix article about optimized binaries for Intel Haswell CPUs via the “-march=core-avx2” Haswell compiler optimizations, in this article is a comparison of the GCC and LLVM/Clang compilers when targeting the new Core i7 4770K CPU. GCC 4.7.3, GCC 4.8.1, LLVM Clang 3.2, and LLVM Clang 3.3 were the tested compilers under Ubuntu Linux when seeing how well these different compilers optimized for Haswell.