GCC 8/9 vs. LLVM Clang 7/8 Compiler Performance On AArch64

Written by Michael Larabel in Software on 12 February 2019. Page 4 of 4. 20 Comments

In other common real-world tests, GCC tended to deliver slightly faster performance than Clang on this 64-bit 32-core ARM server.

If wanting to look at even more raw performance data from this GCC vs. Clang compiler benchmark comparison, the dozens of results can be viewed in full via this OpenBenchmarking.org result file.

If looking at the geometric mean for all of the test runs that successfully ran across all four compilers, GCC comes out ahead but with little difference between last year's GCC8 code-base and the upcoming GCC9. Likewise, between Clang 7.0 and 8.0 wasn't any real difference on the macro level for performance. On this powerful Ampere eMAG server, using GCC yielded 23% better performance than the Clang-built binaries. With the recent x86_64 compiler benchmarks the performance was a toss-up between GCC and Clang while on the POWER9 Talos II the GNU Compiler Collection had around a 10% performance advantage for the geometric mean.

Look for Clang 8.0 to be shipping around the end of February while GCC 9.1 is due for release around April.

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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 TwitterLinkedIn,> or contacted via MichaelLarabel.com.