NZCV
N: negative 算术逻辑运算单元运算结果为负1/正0
Z: zero 算术逻辑运算单元运算结果为零1/非零0
C: 3cases:
1 0
加法 Carray | Not Carray
减法 Not Borrow | Borrow(Not Carray)
移位 Bit Shifted | Rotated Out
V: 后面详细阐述
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