d = vec_perm(a, b, c)Returns a vector that contains some elements of two vectors,
in the order specified by a third vector.
Figure 1. Permute 16 integer elements (8-bit)
Each byte of the result is selected by using the least
significant 5 bits of the corresponding byte of c as
an index into the concatenated bytes of a and b.
Note: The
vector generate mask built-in functions could help generate the mask c.
| d | a | b | c |
|---|---|---|---|
| vector signed char | vector signed char | vector signed char | vector unsigned char |
| vector bool char | vector bool char | vector bool char | |
| vector unsigned char | vector unsigned char | vector unsigned char | |
| vector signed short | vector signed short | vector signed short | |
| vector bool short | vector bool short | vector bool short | |
| vector unsigned short | vector unsigned short | vector unsigned short | |
| vector signed int | vector signed int | vector signed int | |
| vector bool int | vector bool int | vector bool int | |
| vector unsigned int | vector unsigned int | vector unsigned int | |
| vector signed long long | vector signed long long | vector signed long long | |
| vector bool long long | vector bool long long | vector bool long long | |
| vector unsigned long long | vector unsigned long long | vector unsigned long long | |
| vector double | vector double | vector signed double |