__vpermxor
Purpose
Applies a permute and exclusive-OR operation on two byte vectors.
Prototype
vector unsigned char __vpermxor (vector unsigned char a, vector unsigned char b, vector unsigned char mask);
Result
For each i (0 <= i < 16), let indexA be bits 0 - 3 and indexB be bits 4 - 7 of byte element i of mask.
Byte element i of the result is set to the exclusive-OR of byte elements indexA of a and indexB of b.
