(Currently regpairs_aligned gets checked, but this, rightly, returns false for SH; alignment is not a requirement of the SH ABI, but p{read,write}64 are an exception for it.)
(Currently regpairs_aligned gets checked, but this, rightly, returns false for SH; alignment is not a requirement of the SH ABI, but p{read,write}64 are an exception for it.)