JCC跳转指令
JCC指条件跳转指令，CC就是指条件码。
| JCC指令 | 中文含义 | 英文原意 | 检查符号位 | 典型C应用 |
|---|---|---|---|---|
JZ/JE |
若为0则跳转；若相等则跳转 | jump if zero;jump if equal | ZF=1 |
if (i == j);if (i == 0); |
JNZ/JNE |
若不为0则跳转；若不相等则跳转 | jump if not zero;jump if not equal | ZF=0 |
if (i != j);if (i != 0); |
JS |
若为负则跳转 | jump if sign | SF=1 |
if (i < 0); |
JNS |
若为正则跳转 | jump if not sign | SF=0 |
if (i > 0); |
JP/JPE |
若1出现次数为偶数则跳转 | jump if Parity (Even) | PF=1 |
(null) |
JNP/JPO |
若1出现次数为奇数则跳转 | jump if not parity (odd) | PF=0 |
(null) |
JO |
若溢出则跳转 | jump if overflow | OF=1 |
(null) |
JNO |
若无溢出则跳转 | jump if not overflow | OF=0 |
(null) |
JC/JB/JNAE |
若进位则跳转；若低于则跳转；若不高于等于则跳转 | jump if carry;jump if below;jump if not above equal | CF=1 |
if (i < j); |
JNC/JNB/JAE |
若无进位则跳转；若不低于则跳转；若高于等于则跳转； | jump if not carry;jump if not below;jump if above equal | CF=0 |
if (i >= j); |
JBE/JNA |
若低于等于则跳转；若不高于则跳转 | jump if below equal;jump if not above | ZF=1或CF=1 |
if (i <= j); |
JNBE/JA |
若不低于等于则跳转；若高于则跳转 | jump if not below equal;jump if above | ZF=0或CF=0 |
if (i > j); |
JL/JNGE |
若小于则跳转；若不大于等于则跳转 | jump if less;jump if not greater equal jump | SF != OF |
if (si < sj); |
JNL/JGE |
若不小于则跳转；若大于等于则跳转； | jump if not less;jump if greater equal | SF = OF |
if (si >= sj); |
JLE/JNG |
若小于等于则跳转；若不大于则跳转 | jump if less equal;jump if not greater | ZF != OF 或 ZF=1 |
if (si <= sj); |
JNLE/JG |
若不小于等于则跳转；若大于则跳转 | jump if not less equal;jump if greater | SF=0F 且 ZF=0 |
if(si>sj) |