ChuanqiXu9 wrote:

> I'm very confused. `readonly` means that the memory behind `this` cannot be 
> changed, not that the pointer cannot be changed.

Out of curiosity, it looks not same in https://llvm.org/docs/LangRef.html:

> This attribute indicates that the function does not write through this 
> pointer argument, even though it may write to the memory that the pointer 
> points to.
>
> If a function writes to a readonly pointer argument, the behavior is 
> undefined.

My understanding for ` it may write to the memory that the pointer points to.` 
is what you said. Or do we need to update the document?

https://github.com/llvm/llvm-project/pull/106499
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