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Assembly conventions

The code in this library adheres to some code conventions. It is advised to stick to these when using the code in this library. That is, if you want your code to behave as expected.

Register states

  • The A, B and C registers are used to push arguments into a function.
  • The A register will hold the return value from a function if applicable.
  • When calling a function, the A, B and C registers are considered free for all. Their contents are not preserved across calls. So if you are using them for anything important, you are required to save/restore them manually.
  • The registers X, Y, Z, I and J are guaranteed to be preserved across function calls. This means that any function which anticipates usage of these registers must first push their value to the stack and pop them back once done.
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