Atomic signed maximum on halfword in memory, without return, atomically loads a 16-bit halfword 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.
For information about memory accesses, see Load/Store addressing modes.
This is an alias of LDSMAXH, LDSMAXAH, LDSMAXALH, LDSMAXLH. This means:
| 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| 0 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | R | 1 | Rs | 0 | 1 | 0 | 0 | 0 | 0 | Rn | 1 | 1 | 1 | 1 | 1 | ||||||||
| size | VR | A | o3 | opc | Rt | ||||||||||||||||||||||||||
| <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, encoded in the "Rs" field. |
| <Xn|SP> |
Is the 64-bit name of the general-purpose base register or stack pointer, encoded in the "Rn" field. |
The description of LDSMAXH, LDSMAXAH, LDSMAXALH, LDSMAXLH gives the operational pseudocode for this instruction.
If PSTATE.DIT is 1, the timing of this instruction is insensitive to the value of the data being loaded or stored.
Internal version only: aarchmrs v2023-12_rel, pseudocode v2023-12_rel, sve v2023-12_rel ; Build timestamp: 2023-12-15T16:46
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