Re: [PATCH] tcg/arm: Don't emit UNPREDICTABLE LDRD with Rm == Rt or Rt+1

[Richard Henderson]

On 3/11/22 06:02, Alex Bennée wrote:
> A wider question. Is this something that can be handled the constraints
> done by the register allocator? I assume that avoid direct aliasing if
> needed?

No.  We do have "allocate a non-overlapping register"; we don't have "allocate an aligned 
register pair", which *would* be helpful.

However, in this specific case "addend" is completely invisible to the register allocator, 
coming entirely from the backend's tlb implementation (or guest_base).


r~