GCC 6.2/7.0 vs. LLVM Clang 3.9/4.0 SVN Compiler Performance

Clang remains slower than GCC with this multi-threaded ray-tracer.

Clang 4.0 does appear to improve for LAME's MP3 encoding performance, but still not to the GCC levels for this particular task.

These LLVM Clang results didn't come in as good as anticipated. In some cases there were significant performance regressions compared to Clang 3.9, in many cases the performance was unchanged, and only in a few benchmarks were the Clang 4.0 numbers better than Clang 3.9 stable. But keep in mind that Clang 4.0 remains under heavy development and won't be officially released until February. As the GCC 7.1 and Clang 4.0 releases near in 2017, more benchmarks will occur including from more CPU architectures.