[Bug rtl-optimization/64815] ICE caused by volatile_refs_p doesn't skip NULL operand

["terry.guo at arm dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64815

--- Comment #5 from Terry Guo <terry.guo at arm dot com> ---
(In reply to Andrew Pinski from comment #4)
> (In reply to Terry Guo from comment #2)
> > (In reply to Andrew Pinski from comment #1)
> > > I don't think you need to call volatile_refs_p on the notes part of the
> > > instruciton.
> > 
> > The volatile_refs_p works in a recursive way which makes itself to scan the
> > notes part. I just call volatile_refs_p to the insn.
> > 
> > Do you mean I should update volatile_refs_p to avoid recursively scanning
> > the notes part of the insn?
> 
> Oh you should be using volatile_refs_p on the insn but only the set.
> 
> dse.c:      || volatile_refs_p (PATTERN (insn))

Thanks so much. You are right. The ICE disappears. Please mark this bug as
INVALID.