axor

Atomically XOR

AXOR m32, r32

Atomically XORs a value to a remote memory location.

Details

Atomically XORs a 32-bit register value with a memory location without acquiring a lock and without returning the old value. This remote atomic operation guarantees atomicity through cache coherency; it does not serialize the entire pipeline but maintains store-ordering properties. No flags are modified.

Pseudocode Operation

atomic_xor([dest], src);
// Semantically: [dest] ← [dest] ^ src

Example

AXOR [rbp-4], eax

Encoding

Binary Layout

66

+0

0F

+1

38

+2

FC

+3

ModRM

+4

 

Format VEX

Opcode F3 0F 38 FC !(11):rrr:bbb

Extension RAO-INT

Operands

• dest
  Mem
• src
  Reg

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