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As I'm currently implementing an AArch64 code generator for the D language dmd compiler, the inconsistency of its instructions is equaled and worsened by the clumsiness of the documentation for it :-/ But I'm slowly figuring it out.

(For example, some instructions with very different encodings have the same mnemonic. Arrgghh.)

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It's probably no longer maintained, but a former colleague of mine did some work on this for C++: https://github.com/ainfosec/shoulder. Obviously if the docs are lying it doesn't help much, but there was another effort he had https://github.com/ainfosec/scapula that tried to automate detecting behavior differences between the docs and the hardware implementation.

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