Intel 64 and IA-32 Architectures Software Developers Manual Volume 2B, Instruction Set Reference, N-Z

Vol. 2B 4-25
INSTRUCTION SET REFERENCE, N-Z
#PF(fault-code) If a page fault occurs.
#AC(0) (64-bit operations only) If alignment checking is enabled and an
unaligned memory reference is made while the current privilege
level is 3.