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STSET, STSETL, STSETL

Atomic bit set on word or doubleword in memory, without return.

Syntax

STSET Ws, [Xn|SP] ; 32-bit, no memory ordering

STSETL Ws, [Xn|SP] ; 32-bit, release

STSET Xs, [Xn|SP] ; 64-bit, no memory ordering

STSETL Xs, [Xn|SP] ; 64-bit, release

Where:

Ws
Is the 32-bit name of the general-purpose register holding the data value to be operated on with the contents of the memory location.
Xn|SP
Is the 64-bit name of the general-purpose base register or stack pointer.
Xs
Is the 64-bit name of the general-purpose register holding the data value to be operated on with the contents of the memory location.

Architectures supported

Supported in ARMv8.1 and later.

Usage

Atomic bit set on word or doubleword in memory, without return, atomically loads a 32-bit word or 64-bit doubleword from memory, performs a bitwise OR with the value held in a register on it, and stores the result back to memory.

  • STSET has no memory ordering semantics.
  • STSETL stores to memory with release semantics, as described in Load-Acquire, Store-Release.

For information about memory accesses see Load/Store addressing modes in the ARM Architecture Reference Manual ARMv8, for ARMv8-A architecture profile.