17.112 STSMAX, STSMAXL, STSMAXL

Atomic signed maximum on word or doubleword in memory, without return.

Syntax

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

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

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

STSMAXL 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 signed maximum on word or doubleword in memory, without return, atomically loads a 32-bit word or 64-bit doubleword from memory, compares it against the value held in a register, and stores the larger value back to memory, treating the values as signed numbers.

  • STSMAX has no memory ordering semantics.
  • STSMAXL 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.

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