This is the mail archive of the
mailing list for the GCC project.
Re: [trunk] Addition to subreg section of rtl.text.
> > I think one reason is that allowing zero_extracts of multi-word modes is
> > (like this subreg thing) a little hard to pin down. What happens when
> > WORDS_BIG_ENDIAN && !BYTES_BIG_ENDIAN
> Unless I had my grep wrong, the only such machines to do this are PDP11
> and ARM with special flags (-mbig-endian -mwords-little-endian) that
> were "for backward compatibility with older versions of GCC" in 1999 .
> So, is this special case worth keeping?
I'd argue yes, whether or not such machines exist because of
orthogonality concerns: there's value in supporting all four possibilities.