FETCHADD

Operation

Atomically adds source to memory and returns the old memory value in the source register.

Assembler Syntax

FETCHADD.{B|W|L|Q}(z)/order(o) Rn(s), <ea>(e)

Privilege

Unprivileged

Atomically replaces the memory operand with the selected-width sum of the old memory value and the source, and returns the old memory value in the source register.

2.75in

Encodings

FETCHADD.{B|W|L|Q}(z)/order(o) Rn(s), <ea>(e)

Format: Instruction format for FETCHADD.{B|W|L|Q}(z)/order(o) Rn(s), <ea>(e)

order — allowed: 0x0..0x4 [memory_order_reserved_reclaimed]

memory — excluded: immediate [memory_operand_required]