vec_gbb
Purpose
Performs a gather-bits-by-bytes operation on the input.
Note: This built-in function
is valid when the -mcpu
option is set to target POWER8 processors,
or higher.
Syntax
d=vec_gbb(a)Result and argument types
The following table describes the types of the returned value and the function arguments.
| d | a |
|---|---|
| vector unsigned long long | vector unsigned long long |
| vector signed long long | vector signed long long |
Result value
Each doubleword element of the result is set as follows: Let x(i) (0 <=
i < 8) denote the byte elements of the corresponding input doubleword element,
with x(7) the most significant byte. For each pair of i and
j (0 <= i < 8, 0 <= j < 8), the
jth bit of the ith byte element of the result is set to the value
of the ith bit of the jth byte element of the input.