向量数据库 (vec_sldb)
用途
移位由给定位留下的双宽向量，并返回移位结果的最左边 128 位。
注: 仅当 -mcpu 选项设置为目标 Power10 处理器时，此 内置函数 才有效。
语法
d=vec_sldb(a,b,c)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 | b | c |
|---|---|---|---|
| vector signed char | vector signed char | vector signed char | const unsigned int |
| vector unsigned char | vector unsigned char | vector unsigned char | const unsigned int |
| vector signed short | vector signed short | vector signed short | const unsigned int |
| vector unsigned short | vector unsigned short | vector unsigned short | const unsigned int |
| vector signed int | vector signed int | vector signed int | const unsigned int |
| vector unsigned int | vector unsigned int | vector unsigned int | const unsigned int |
| vector signed long long | vector signed long long | vector signed long long | const unsigned int |
| vector unsigned long long | vector unsigned long long | vector unsigned long long | const unsigned int |
注:
c 的值必须介于 0 与 7 之间 (含)。结果值
让 e 成为 a 和 b的并置， 左侧有 a 。 让 e ' 由 c指定的位数向左移动 e 。 然后，将 d 设置为 e'的最左边的 128 位。