AMOSWAP.W

Atomic Swap Word

AMOSWAP.W rd, rs2, (rs1)

Atomically swaps a value in memory with a register.

Details

AMOSWAP.W atomically loads a word from the address in rs1 into rd and stores the value of rs2 to that address.

Pseudocode Operation

temp = M[R[rs1]]; M[R[rs1]] = R[rs2]; R[rd] = temp;

Example

AMOSWAP.W x10, x11, (x12)

Encoding

Binary Layout
00001
31:27
aq
26
rl
25
rs2
24:20
rs1
19:15
010
14:12
rd
11:7
0101111
6:0
 
Format R-Type (Atomic)
Opcode 0x2F
Extension A

Operands

  • rd
    Dest (Old Value)
  • rs2
    New Value
  • rs1
    Address