INTO - x86-64 instruction reference

intoInterrupt if overflow 
Raises an INT 4 software interrupt if and only if the overflow flag is set.
8086 and later·Not available in 64-bit mode
Intel's reference: INTn/INTO/INT3/INT1 
CFPFAFZFSFTFIFDFOF –––––●●––
● set from the result
– not changed
Reads OF
Forms  into  