GCC 6.2/7.0 vs. LLVM Clang 3.9/4.0 SVN Compiler Performance
Written by Michael Larabel in Software on 10 December 2016. Page 4 of 4. 28 Comments

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.

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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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