Index

6. Jumping Based on the Processor Flags

Instruction	Jumps if
JC / JB / JNAE	Carry flag is set
JNC / JNB / JAE	Carry flag is clear
JBE / JNA	Either carry or zero flag is set
JA / JNBE	Carry and zero flag are clear
JE / JZ	Zero flag is set
JNE / JNZ	Zero flag is clear
JL / JNGE	Sign flag overflow flag
JGE / JNL	Sign flag = overflow flag
JLE / JNG	Zero flag is set or sign overflow
JG / JNLE	Zero flag is clear and sign = overflow
JS	Sign flag is set
JNS	Sign flag is clear
JO	Overflow flag is set
JNO	Overflow flag is clear
JP/JPE	Parity flag is set (even parity)
JNP/JPO	Parity flag is clear (odd parity)

For example,

    ; handle overflow condition
        add     ax, bx          ; Add two values
        jo      overflow        ; If value too large, adjust

        ; no overflow occurred
        .

    overflow:
        ; handle overflow condition
        .

<<< Conditional Jumps

Index

Parity Jumps >>>