stlrb

Store-Release Register Byte

STLRB <Wt>, [<Xn|SP>]

Stores a byte with Release semantics.

Pseudocode Operation

address ← Xn
MemoryOrder(Release)
[address] ← Wt[7:0]

Example

STLRB w3, [x1]

Encoding

Binary Layout

00

31:30

0010001

29:23

0

22

0

21

11111

20:16

1

15

11111

14:10

Rn

9:5

Rt

4:0

 

Format Load/Store

Opcode 0x089FFC00

Extension Base (Atomic)

Operands

• Wt
  Transfer 32-bit integer register (load/store)
• Xn
  First source / base 64-bit integer register

Related

More in Base (Atomic)

Reference

View in Arm A64 ISA Reference ↗ Arm A64 ISA

Instruction Forms

Encoding	Instruction		ISA		Bit pattern
0x089FFC00	STLRB <Wt>, [<Xn|SP>{, #0}]		A64		00 | 0010001 | 0 | 0 | 11111 | 1 | 11111 | Rn | Rt

Description

Store-Release Register Byte stores a byte from a 32-bit register to a memory location. The instruction also has memory ordering semantics as described in Load-Acquire, Store-Release. For information about memory accesses, see Load/Store addressing modes.

Operation

bits(64) address;
bits(8) data;

AccessDescriptor accdesc;
accdesc = CreateAccDescAcqRel(MemOp_STORE, tagchecked);

if n == 31 then
    CheckSPAlignment();
    address = SP[];
else
    address = X[n, 64];

address = GenerateAddress(address, 0, accdesc);
data = X[t, 8];
Mem[address, 1, accdesc] = data;