ANDN

AND Not

ANDN rd, rs1, rs2

Performs bitwise AND with the bitwise negation of rs2 (rs1 & ~rs2).

Details

ANDN computes the bitwise AND of rs1 with the bitwise NOT of rs2, writing the result to rd. Equivalent to rd = rs1 & ~rs2.

Pseudocode Operation

R[rd] = R[rs1] & ~R[rs2];

Example

ANDN x10, x11, x12

Encoding

Binary Layout
0100000
31:25
rs2
24:20
rs1
19:15
111
14:12
rd
11:7
0110011
6:0
 
Format R-Type
Opcode 0x33
Extension Zbb

Operands

  • rd
    Destination register (integer)
  • rs1
    Source register 1 (integer)
  • rs2
    Source 2 (Inverted)