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neg

Two's complement negation

Replaces the operand with its two's complement, which inverts every bit and then adds one.

8086 and latertakes lock

Intel's reference: NEG

CFPFAFZFSFDFOF ●●●●●–●
  • ● set from the result
  • – not changed

Forms

Operands

r/m
A general-purpose register or memory location matching the operation’s size, for example rax or qword [rbp-8]. The byte registers ah, bh, ch and dh cannot be used with a REX prefix, including when the memory address uses r8–r15.

NOT, similarly, performs one's complement (inverts all the bits).

global _start

section .text
_start:
        mov rax, 12
        mov rbx, 5
        mov rcx, 3
        mov rsi, 9

        neg rax

        mov rax, 60         ; syscall 60: exit
        xor rdi, rdi
        syscall