Scrying the AMD GFX1250 LLVM Tea Leaves for MI455X Insights
I analyzed LLVM commits to uncover the architecture of AMD's upcoming MI455X accelerator. The new GFX1250 chip merges cache hierarchies, supports massive register files, and combines RDNA4's programming model with CDNA4's performance. It strips away graphics features to focus purely on compute, signaling a bold shift in AMD's AI strategy.
We're seeing that this GFX125x is even more of a pure compute accelerator than even prior CDNA architectures with nearly all graphics features having been removed.
- majke
I'm a heavy user of NVIDIA LOP3 instruction (uint32). I wonder when AMD will finally support it well.
- androiddrew
Where does someone start on kernel development for an RDNA4? Books, resources, whatever?
8 year developer just getting into to AI side of the house
- WithinReason
...not just implementing barriers in hardware but also full monitors, allowing the wave to be notified if a specific cache line is evicted from the L2 cache.
What is this feature for? When do you need it?