AMOAND.W

Atomic AND Word

AMOAND.W rd, rs2, (rs1)

Atomically performs bitwise AND on a word in memory.

Encoding

Binary Layout

01100

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 0x6000202F

Extension A

Operands

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

Example

AMOAND.W x5, x6, (x7)

// Atomically ANDs memory at x7 with x6.

Related

More in A

Reference

View in RISC-V Unprivileged ISA Specification ↗ RISC-V ISA Manual

Description

AMOAND.W atomically loads a word from the address in rs1 into rd, ANDs it with rs2, and stores the result back.

Operation

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