The development team at GPUOpen has published the RDNA 3 Instruction Set Architecture, a programming guide to assist developers looking to work with AMD's new graphics architecture. This published work follows the release of the AMD Radeon RX 7900 GPUs.
AMD publishes a new instruction manual for RDNA 3 shader code and other various related tasks
AMD supplies teams and coders through RDNA 3 shader code tasks that can offer optimizations on low-level jobs or projects that utilize the AMD AMDGPU LLVM shader compiler, reports Linux analyst, and editor of the website Phoronix. Various models outlined and included in the new ISA are the RDNA 3 shader code and wave execution models, interactions with memory levels within the shader core, and other outlined instructions. The manual also details compiler-level tuning and enhancements not directed at the compilers, as mentioned earlier.
We’re pleased to announce the availability of the AMD RDNA™ 3 ISA reference guide following the release of our first RDNA 3-based GPU products. The ISA guide is most useful for anyone interested in the lowest level operation of the RDNA 3 shader core, be that shader compiler writers, tools authors, and any game or application developer that needs to optimize their shaders for the new GPU.
The guide covers the whole shader core execution model, including program state, the various wave execution models, how the shader core interacts with the memory hierarchy, the available instructions, including their encodings, and lots more.
— AMD GPUOpen blog
Larabel mentions that the documentation does not outline any of the programming information for IP blocks that are not centered around the shader technology. The editor continues to recall that AMD has lost focus on offering documentation for hardware programming instances for many generations and has instead provided "living documentation paired with their documented register header files for each GPU." Most of the company's attention focuses on ensuring that the drivers are optimized and ready for use without needing to supply documentation such as the recently released ISA documentation.
Phoronix's editor informs users that the AMD Radeon RX 7900 graphics cards conduct well when combining Linux 6.0 and higher along with the Mesa 22.3/23.0-devel Git, which supplies the most recent RadeonSI and Radeon Vulkan driver sets. For users looking to get involved with the newest AMD RDNA 3 ISA information can be read in the PDF on the company's GPUOpen website.
News Sources: Phoronix, AMD GPUOpen
