The New Features Of LLVM 9.0 & Clang 9.0 - Includes Building The Linux x86_64 Kernel

Written by Michael Larabel in LLVM on 10 September 2019 at 07:49 AM EDT. 17 Comments
The LLVM 9.0 release is running a few weeks behind schedule but should be out in the days ahead along with other LLVM sub-project releases like Clang 9.0. Here's a look at what's on tap for this half-year update to the LLVM compiler infrastructure.

Coming with LLVM 9.0 includes new/improved functionality like:

- The big amounts of Navi/GFX10 enablement for the AMDGPU compiler back-end.

- The new GFX908 Vega target for the "Arcturus" GPU.

- The RISC-V back-end is now officially supported.

- AVX512 VP2INTERSECT support.

- JITLink has landed.

- IBM MASS vectorization library support for POWER.

- Various optimizations.

The Clang 9.0 compiler meanwhile is bringing:

- The AMD Zen 2 "znver2" support.

- Initial C2x language mode support.

- Modules support is enabled in the C++2a mode.

- Time trace profiling data can now be easily generated.

- BFloat16 support.

- The Intel Cooperlake CPU target is added for that forthcoming Xeon family.

- Initial bits for Intel Sapphire Rapids and the new ENQCMD instruction.

- Interface Stubs for interface libraries to ELF shared objects.

- Clang-Scan-Deps was merged for faster dependency scanning.

- Arm Cortex-A76 support.

- Various OpenCL C additions as well as experimental support for C++17 features in OpenCL.

- Clang-Format can now format C# files.

- Support for "asm goto" so the mainline Linux x86_64 kernel can now build and boot with Clang 9.0. YEAH!

Stay tuned for the LLVM/Clang 9.0 release in the coming days and more compiler benchmarks on Phoronix.
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Michael Larabel is the principal author of 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 automated benchmarking software. He can be followed via Twitter, LinkedIn, or contacted via

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