__CLZ(__RBIT(0x40000000U))

__CLZ(__RBIT(0x40000000U))是一个位操作的命令。首先，__RBIT()函数将输入的参数按位翻转。然后，__CLZ()函数统计输入值从最高有效位（MSB）开始连续的0的个数。对于输入值0x40000000U，经过__RBIT()函数翻转后，变为0x00000004U，然后经过__CLZ()函数统计0的个数，结果为28。因此，__CLZ(__RBIT(0x40000000U))的结果为28。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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