AARCH
UARCH diff = AARCH(ref) ^ AARCH(ip);
UARCH diff = AARCH(ref) ^ AARCH(ip);
UARCH diff = AARCH(ref) ^ AARCH(ip);
UARCH diff = AARCH(ref) ^ AARCH(ip);
UARCH diff = AARCH(ref) ^ AARCH(ip);
UARCH diff = AARCH(ref) ^ AARCH(ip);