BNE

Branch if Not Equal

BNE rs1, rs2, offset

Take the branch if registers rs1 and rs2 are not equal.

Encoding

Binary Layout

bimm12hi

31:25

rs2

24:20

rs1

19:15

001

14:12

bimm12lo

11:7

1100011

6:0

 

Format B-Type

Opcode 0x00001063

Extension RV32I

Operands

• rs1
  Source register 1 (integer)
• rs2
  Source register 2 (integer)
• offset
  PC-relative offset

Example

BNE x5, x6, loop

// Jump to 'loop' if x5 != x6.

Related

Across architectures

Compare and Branch : how x86, ARM, RISC-V, and PowerISA each do this.

More in RV32I

Reference

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

Description

BNE takes the branch if rs1 is not equal to rs2. The branch target is the PC of the branch plus the sign-extended B-immediate within a ±4 KiB range.

Operation

if (R[rs1] != R[rs2]) PC += sext(offset);