stq 23456789,22446688,  0 => 0000000023456789,0000000022446688)

lq (0xaaccee0011335577, 0xabcdef0123456789) =>  (reg_pair = 11335577,23456789)

lbarx (0xaaccee0011335577, 0xabcdef0123456789) =>  (reg_pair = 0x000000aa, 0x00000000)

lharx (0xaaccee0011335577, 0xabcdef0123456789) =>  (reg_pair = 0x0000aacc, 0x00000000)

lqarx (0xaaccee0011335577, 0xabcdef0123456789) =>  (reg_pair = 0x11335577, 0x23456789)

stbcx. 45236789,44226688, =>  8900000000000000,0000000000000001; CR=20000000

sthcx. 45236789,44226688, =>  6789000000000000,0000000000000001; CR=20000000

stqcx. 45236789,44226688, =>  0000000045236789,0000000044226688; CR=20000000

All done. Tested 8 different instructions