(inst mtxer zero-tn) ; clear sticky overflow bit in XER, CR0
(inst addo temp x x) ; set XER OV if top two bits differ
(inst addo. temp temp temp) ; set CR0 SO if any top three bits differ
(inst mtxer zero-tn) ; clear sticky overflow bit in XER, CR0
(inst addo temp x x) ; set XER OV if top two bits differ
(inst addo. temp temp temp) ; set CR0 SO if any top three bits differ