> Presumably the MEM isn't a valid memory address, but it's allowed
> through due to the use of an "X" constraint?

Yes (that was supposed to be more or less clear given the description :-).

> ISTM that LRA has to be prepared to handle an arbitrary RTX, so punting
> seems appropriate.

My opinion too.  Note that Bernd E. has another solution though.

-- 
Eric Botcazou

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