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STUMIN, STUMINL, STUMINL

Atomic unsigned minimum on word or doubleword in memory, without return.

Syntax

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

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

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

STUMINL 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 ARMv8.1 and later.

Usage

Atomic unsigned minimum 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 smaller value back to memory, treating the values as unsigned numbers.

  • STUMIN has no memory ordering semantics.
  • STUMINL stores to memory with release semantics, as described in Load-Acquire, Store-Release in the ARMv8-A Architecture Reference Manual.

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

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