Atomic unsigned maximum on byte in memory, without return.
Xn|SP] ; No memory ordering general registers
Xn|SP] ; Release general registers
- 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.
- Is the 64-bit name of the general-purpose base register or stack pointer.
Supported in ARMv8.1 and later.
Atomic unsigned maximum on byte in memory, without return, atomically loads an 8-bit byte from memory, compares it against the value held in a register, and stores the larger value back to memory, treating the values as unsigned numbers.
STUMAXBhas no memory ordering semantics.
STUMAXLBstores 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.