RFC/A: A generic decompose_address routine

[Richard Sandiford]

Vladimir Makarov <vmakarov@redhat.com> writes:
> I am thinking that pseudo assignment (reg_renumber) could be used to 
> differ base and index registers too.  Although I am not sure it is worth 
> to do as it creates strange dependencies and that it can help probably 
> in very rare cases or only for some weird targets.

Sounds like a good idea.

> But it is not a final code probably we will need some changes for
> porting other targets to LRA and if we really need this we could
> return to this.

Definitely. :-)  I'd be very surprised if this initial version
is general enough.

> It is ok for me to commit the patch.  I have no power to approve changes 
> for files outside LRA although I think the place is not important for 
> approval as LRA now only use it and with the point of LRA the code is 
> good.  But I guess you have the power for changes on RTL side of the 
> compiler.

Thanks, applied on that basis.

Richard