NAND logical bitwise operation in ARM

问题

Is there a way to perform a bitwise NAND operation on the bits in two registers in ARM7, either with the existing AND, OR and EOR operations or other instructions?

回答1:

Sure; AND the two registers and then EOR the result with all 1's (for the negation).

回答2:

and then mvn (move not).

From GCC explorer

int nand(int a, int b) {
    return ~(a & b);
}

nand(int, int):
    and r0, r0, r1
    mvn r0, r0
    bx  lr

来源：https://stackoverflow.com/questions/21207561/nand-logical-bitwise-operation-in-arm