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Eh, x86 is about as proprietary as you can get. Intel allows exactly two companies, beside itself, to create x86 microprocessors: AMD and Via. Noone else can.
Compare with ARM.
You missed the point - x86 is highly documented and works with this.
AMD and NVIDIA GPU's are scarcely documented(AMD - newest, NVIDIA - all) and there is zero opensource API atm to use them efficiently.
On x86 you have various compilers and various libraries - all opensource.
What you mean is license to manufacture the hardware based on the specs.
Your response would be correct if I claimed neither AMD nor Nvidia allow MANUFACTURING 1:1 of their chips. They don't allow this either.
Of course GPU are a bit different from CPU, yet in near future I would like to offload big part of the code to GPU. No such opensource solution exists. I cannot work with hardware using opensource tools.
But there is also chinese Loongson(opensource in closed source government ftw!)