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⇱ Mesa's Rusticl Lands OpenCL FP16 Half-Float Support - Phoronix

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Mesa's Rusticl Lands OpenCL FP16 Half-Float Support

Written by Michael Larabel in Mesa on 5 June 2025 at 08:11 PM EDT. 5 Comments
Mesa's modern Rust-written OpenCL driver for Gallium3D "Rusticl" has closed one of the few remaining gaps with the former Clover OpenCL state tracker. Merged today for Mesa 25.2 is native FP16 support.

Rusticl merged cl_khr_fp16 support for native FP16 half-float support within this OpenCL implementation. The OpenCL FP16 support has been successfully tested so far with the Asahi (Apple Silicon), Freedreno (Qualcomm Adreno), LLVMpipe, Panfrost (Arm Mali), RadeonSI (Radeon), and Zink (OpenGL on Vulkan) drivers.

👁 Rusticl FP16


Karol Herbst of Red Hat opened this merge request two months ago for OpenCL FP16 support with Rusticl to close that feature gap with the old Clover code. Today it's merged and ready to go with next quarter's Mesa 25.2 release.

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.