JCC jump instruction
JCC refers conditional jump instructions, CC refers to the condition code.
| JCC instruction | Chinese meaning | English intended | Check the sign bit | Typical applications C |
|---|---|---|---|---|
JZ/JE |
If the jump is 0; jump if equal | jump if zero;jump if equal | ZF=1 |
if (i == j);if (i == 0); |
JNZ/JNE |
If the jump is 0; jump if not equal | jump if not zero;jump if not equal | ZF=0 |
if (i != j);if (i != 0); |
JS |
If it is negative jump | jump if sign | SF=1 |
if (i < 0); |
JNS |
If you are a regular jump | jump if not sign | SF=0 |
if (i > 0); |
JP/JPE |
If the appearance count is even jump | jump if Parity (Even) | PF=1 |
(null) |
JNP/JPO |
If an odd number of occurrences Jump | jump if not parity (odd) | PF=0 |
(null) |
JO |
If the overflow jump | jump if overflow | OF=1 |
(null) |
JNO |
If there is no overflow jump | jump if not overflow | OF=0 |
(null) |
JC/JB/JNAE |
If the carry jump; jump if below; jump if not equal than | jump if carry;jump if below;jump if not above equal | CF=1 |
if (i < j); |
JNC/JNB/JAE |
If there is no carry jump; jump if below; if higher than or equal jump; | jump if not carry;jump if not below;jump if above equal | CF=0 |
if (i >= j); |
JBE/JNA |
If less than equal to jump; jump if greater than | jump if below equal;jump if not above | ZF=1或CF=1 |
if (i <= j); |
JNBE/JA |
If less than equal to jump; jump if greater than | jump if not below equal;jump if above | ZF=0或CF=0 |
if (i > j); |
JL/JNGE |
If less than the jump; jump if greater than or equal | jump if less;jump if not greater equal jump | SF != OF |
if (si < sj); |
JNL/JGE |
If less than the jump; jump if greater than or equal; | jump if not less;jump if greater equal | SF = OF |
if (si >= sj); |
JLE/JNG |
If less jump; jump if greater than | jump if less equal;jump if not greater | ZF != OF 或 ZF=1 |
if (si <= sj); |
JNLE/JG |
If less jump; jump if greater than | jump if not less equal;jump if greater | SF=0F 且 ZF=0 |
if(si>sj) |