nightmares with biased stack pointers

[Joern Rennecke]

>    > Or do the elimination macros handle all of this transparently (or
>    > can be made to do so)?
> 
>    No, you have to define GO_IF_LEGITIMATE_ADDRESS to handle this
>    correctly.  If you have LEGITIMIZE_ADDRESS, that macro might need
>    adjustments too.
> 
> Oh I see, so you teach those macros to check if a stack relative
> offset is "in range" and if not, tell the caller to generate a reload,
> right?

Sort of.  However, GO_IF_ELGITIMIZE_ADDRESS is used in multiple places,
some of them not in reload.  And LEGITIMIZE_ADDRESS is only used in a single
place in explow.c, not in reload at all.