407 caused by prefetch instructions

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118241

--- Comment #3 from Pengcheng Wang  ---
(In reply to Andrew Pinski from comment #1)
> The real fix is match_operand should have a mode on it. That is what is
> causing the ICE in the first place. Though tightening up the predicates from
> accepting all addresses to just registers might improve code generation too
> and less "reloads". Note adding a mode to match_operand requires an define
> expand for prefetch.

Thanks! Which way do you think I should proceed on?