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Re: Is (set (subreg:SI (reg:HI) 0) (const_int)) valid rtx?
> Hi Richard,
>
> > > I had "before register allocation" in mind and assumed a target
> > > architecture allows (set (reg:SI) (const_int)). Given these, would
> > > you also say that the validity depends on WORD_REGISTER_OPERATIONS as
> > > Joern suggested?
> >
> > No, I wouldn't think so. Seems like a "normal" case of
> > a paradoxical subreg to me. It will require less than
> > desirable work-arounds from reload, if it makes it that
> > far, but it should *work*.
>
> Hmm. So if local-alloc causes an ICE due to
>
> (set (subreg:SI (reg:HI x) 0)
> (...)),
>
> then is it probably a bug in local-alloc, not somebody that creates
> the above rtx!?
Yes, such a subreg is valid. I've missed the begginig of thread so I
don't know what failure you get, but in general it should work.
Honza
>
> Kazu Hirata