Depending on the implementation of FGU 220, some instructions or {TAIL ~ instruction operand} or result scenarios may be trapped and handled or emulated by {HEAD ~ software} 
Depending on the implementation of FGU 220 , some instructions or { TAIL ~ instruction operand } or result scenarios may be trapped and handled or emulated by { HEAD ~ software }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD