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The amount of information is probably much less, because compression algorithms are good at compressing repetition, but not that good at compressing numeric patterns (e.g. incrementing numbers), which these things are full of.
This kind of horribleness is common in large companies, yet any sensible engineer would agree it is ridiculous (it serves *no purpose* to have those duplicate defs, and makes this unmaintainable without having the entire generation stack).
This is why AMD needs hundreds of engineers and a good fraction of them are probably working on drivers, while just a few skilled people can put together working open source reverse engineered GPU drivers. Corporate structures tend to create *massive* overhead and silliness.
My gut feeling is Apple is leaner in this respect, and gets by with smaller teams, but also overworks them more. We'll see just how sane or not their GPU design is.
Another reason why AMD needs hundreds of engineers is that AMD's drivers aren't "a driver", they're an entire from-scratch 3D graphics, encoding, decoding, display controller, modesetting, etc stack. Just like Nvidia's. Probably 80% of the code is accomplishing the same tasks.
Open source drivers share all the common code, which is already there, and only add support for the specific hardware involved.
They have the generation stack internally so I’m inclined to think they simply don’t think/care about the open source release much.
Yes but how many teams is it removed from the people writing the drivers? And how is this mess useful for drivers anyway, when the code needs to be abstracted out to reference hardware blocks by index/offset, not every single instance of every register?
why are duplicate definitions necessarily bad? they probably reflect different hardware generations
using some kind of compression which deduplicates them automatically would make sense of course
The non-kernel devs have done lots of auto-merging to make it slightly more sane: https://github.com/GPUOpen-Drivers/pal/tree/dev/src/core/hw/gfxip/gfx9/chip …;https://gitlab.freedesktop.org/mesa/mesa/-/tree/master/src/amd/registers …
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