stq abcdef0123456789,1133557722446688,   0 => abcdef0123456789,1133557722446688)

lq (0xaaccee0011335577, 0xabcdef0123456789) =>  (reg_pair = 0xaaccee0011335577, 0xabcdef0123456789)

lqarx (0xaaccee0011335577, 0xabcdef0123456789) =>  (reg_pair = 0xaaccee0011335577, 0xabcdef0123456789)

stqcx. abefcd0145236789,1155337744226688 => abefcd0145236789,1155337744226688; CR=20000000

All done. Tested 4 different instructions