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 | 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) |