17.109 STSET, STSETL, STSETL

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

Syntax

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

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

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

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

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 the Arm®v8.1 architecture 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.

For information about memory accesses see Load/Store addressing modes in the Arm® Architecture Reference Manual Arm®v8, for Arm®v8‑A architecture profile.

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