BINV

Bit Invert

BINV rd, rs1, rs2

Inverts (toggles) a single bit in rs1 at the index specified by rs2.

Encoding

Binary Layout

0110100

31:25

rs2

24:20

rs1

19:15

001

14:12

rd

11:7

0110011

6:0

 

Format R-Type

Opcode 0x68001033

Extension Zbs

Operands

• rd
  Destination register (integer)
• rs1
  Source
• rs2
  Index

Example

BINV x10, x11, x12

// Toggle the bit at index x12.

Related

More in Zbs

Reference

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

Description

BINV inverts the single bit of rs1 selected by the lower log2(XLEN) bits of rs2, writing the result to rd.

Operation

R[rd] = R[rs1] ^ (1 << (R[rs2] & (XLEN-1)));