Mesa 26.3 enables Intel’s Jay shader compiler by default
Mesa 26.3 will use Intel’s new open-source Jay compiler by default on Xe2 and Xe3 GPUs, including Battlemage, Lunar Lake, and Panther Lake. Phoronix reports roughly 10% better performance than the existing BRW compiler and shader compilation up to 55% faster than BRW in the cited Fossil workload; the linked XDC slides explain Jay’s SSA/tree-scan allocation approach and the work needed to handle Intel GPU register-layout quirks.
These are early, workload-specific results for a compiler enabled by default in the upcoming Mesa release. Phoronix’s one-comment forum thread returned HTTP 403, so reader reaction was unavailable.