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RFC: aco: Add a disassembler

Konstantin Seurer requested to merge KonstantinSeurer/mesa:aco-dis into main

Based on !29695 .

Replaces the LLVM path with a lot of spaghetti code. I tried to match the LLVM output as closely as possible but there still are some differences. (Some due to LLVM bugs)

Design

I didn't use isaspec because the gcn instruction set is very inconsistent when it comes to instruction lengths and operand meanings, ... The disassembler consists of three parts:

  • disasm_program and disasm_instr, which iterate over the instructions, detect the encoding and dispatch the various instruction handlers.
  • instruction handlers, split based on gfx_level, if a new generation changed a lot, and encoding.
  • general utilities, which handle common tests like extracting fields, printing operands, ...

I hope this keeps code duplication at a minimum while avoiding long gfx_level if - else if chains.

Merge request reports

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