Intel 64 and IA-32 Architectures Software Developer’s Manuals Volume 1 5.1.4 "Logical Instructions"
userland/arch/x86_64/and.S: AND
userland/arch/x86_64/not.S: NOT
userland/arch/x86_64/or.S: OR
userland/arch/x86_64/xor.S: XOR