vec_cntlz
用途
计算给定向量的每个元素的最高有效零位。
当 -qarch 设置为 POWER8 或更高处理器时，此内置功能有效。
语法
d=vec_cntlz(a)结果和参数类型
下表描述了返回值和函数参数的类型。
| d | a |
|---|---|
| vector unsigned char | vector signed char |
| vector unsigned char | |
| vector unsigned short | vector signed short |
| vector unsigned short | |
| vector unsigned int | vector signed int |
| vector unsigned int | |
| vector unsigned long long | vector signed long long |
| vector unsigned long long |
结果值
结果的每个元素的值都设置为 a的相应元素的前导零数。