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⇱ Clang 21 Delivering Nice Performance Gains On AMD EPYC Zen 4 With HBM3 - Phoronix

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Clang 21 Delivering Nice Performance Gains On AMD EPYC Zen 4 With HBM3

Written by Michael Larabel in Software on 21 November 2025 at 11:00 AM EST. Page 4 of 4. 5 Comments.

In some of the more "conventional" Linux server workloads there were also some minor performance gains found when using binaries generated by Clang 21.

Overall, LLVM Clang 21 was still able to provide some additional performance uplift for this AMD Zen 4 testing.

LLVM/Clang continues moving in the right direction for performance. Besides continuing to test Clang 21 on more hardware, also on my never-ending TODO list is also some fresh comparison benchmarks against the GCC and AMD AOCC compilers. Thanks to Microsoft for providing the free remote access to the Azure HBv5 VMs for testing at Phoronix.

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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, LinkedIn, or contacted via MichaelLarabel.com.