shiltian wrote:

> Why is that a DL property and not just a target property?

It is indeed a target property. DL is one choice here (if it is not the most 
preferable one). Like I mentioned before, TTI and `TargetMachine` could have 
been one, but not feasible. Where else do you suggest?

> Or even just "computable" by asking query 1) for different ASs?

IIUC, the query 1) you were referring to was `Type::canLosslesslyBitCastTo`. If 
that's the case, it does nothing for AS cast.

https://github.com/llvm/llvm-project/pull/108786
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