BLT

Branch if Less Than

BLT rs1, rs2, offset

Take the branch if rs1 is less than rs2 (signed).

Encoding

Binary Layout

bimm12hi

31:25

rs2

24:20

rs1

19:15

100

14:12

bimm12lo

11:7

1100011

6:0

 

Format B-Type

Opcode 0x00004063

Extension RV32I

Operands

• rs1
  Source register 1 (integer)
• rs2
  Source register 2 (integer)
• offset
  Offset

Example

BLT x10, x11, exit

// Branch to 'exit' if x10 < x11 (signed comparison).

Related

More in RV32I

Reference

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

Description

BLT takes the branch if rs1 is less than rs2, using a signed comparison. The branch target is the PC plus the sign-extended B-immediate.

Operation

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