[adrian_b]

The AMD documentation consists mostly of very laconic descriptions of the (hundreds or thousands of) registers and of their bit fields.

There is almost no explanation about how they are intended to be used and about the detailed microarchitecture of their GPUs. For that, the best remains to read the source code of their Linux drivers, though even that is not always as informative as it could be, as some of the C code may have been automatically generated from some other form used internally by AMD.

The Intel documentation is much more complete.

Nevertheless, AMD has promised recently in several occasions that they will publish in the near future additional GPU documentation and additional open-source parts of their GPU drivers, so hopefully there will be a time when the quality of their documentation will match again that of Intel, like it did until around 2000.