https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78041
--- Comment #5 from Bernd Edlinger <bernd.edlinger at hotmail dot de> ---
(In reply to Wilco from comment #4)
> However dealing with partial overlaps is complex so maybe the best option
> would be to add alternatives to <shift>di3_neon to either allow full overlap
> "r 0 X X X" or no overlap "&r r X X X". The shift code works with full
> overlap.
That sounds like a good idea.
Then this condition in <shift>di3_neon could go away too:
&& (!reg_overlap_mentioned_p (operands[0], operands[1])
|| REGNO (operands[0]) == REGNO (operands[1])))
