logical.asm

.globl _start
_start:

# logical operations

mov $0, %rax
mov $1, %rbx
and %rbx, %rax
# rax is now 0

mov $0, %rax
mov $1, %rbx
or %rbx, %rax
# rax is now 1

mov $1, %rax
mov $1, %rbx
xor %rbx, %rax
# rax is now 0

mov $0, %rax
mov $1, %rbx
test %rbx, %rax
# like AND but does not change the result

# flags: SF, ZF, PF

xor %rax, %rax
not %al
# rax is now 255

# shift operations

mov $0xf0, %rax # 1111.0000
shr $3, %al # 0001.1110
shl $4, %al # 1110.0000

mov $0xf0, %rax # 1111.0000
sal $3, %al # 1000.0000
sar $4, %al # 1111.1000

mov $39, %rax # 0010.0111
ror $1, %al # 1001.0011
rol $2, %al # 0100.1110

mov $39, %rax # 0010.0111
rcr $1, %al # 0001.0011, CF=1
rcr $2, %al # 1110.0010, CF=0

# flags: OF

# exit just in case
mov $0x3c, %rax
xor %rdi, %rdi
syscall