ARM base instruction -- csinv

Conditional Select Invert returns, in the destination register, the value of the first source register if the condition is TRUE, and otherwise returns the bitwise inversion value of the second source register.
假如条件为TRUE，则条件选择反转在目的寄存器中返回第一个源寄存器的值，否则返回第二个源寄存器按位反转的值。

32-bit variant
    Applies when sf == 0.
    CSINV <Wd>, <Wn>, <Wm>, <cond>
64-bit variant
    Applies when sf == 1.
    CSINV <Xd>, <Xn>, <Xm>, <cond>
Decode for all variants of this encoding
 integer d = UInt(Rd);
 integer n = UInt(Rn);
 integer m = UInt(Rm);
 integer datasize = if sf == '1' then 64 else 32;
Operation
 bits(datasize) result;
 bits(datasize) operand1 = X[n];
 bits(datasize) operand2 = X[m];
 
 if ConditionHolds(cond) then
     result = operand1;
 else
     result = NOT(operand2);
 
 X[d] = result;