SH2ADD

Shift Left 2 and Add

SH2ADD rd, rs1, rs2

Shifts rs1 left by 2 and adds rs2. Used for calculating addresses of 32-bit elements.

Encoding

Binary Layout

0010000

31:25

rs2

24:20

rs1

19:15

100

14:12

rd

11:7

0110011

6:0

 

Format R-Type

Opcode 0x20004033

Extension Zba

Operands

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

Example

SH2ADD x10, x11, x12

// Calculate address: x12 + (x11 * 4).

Related

More in Zba

Reference

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

Description

SH2ADD shifts rs1 left by 2 bits, then adds to rs2, writing to rd. Used for stride-4 array indexing (e.g., int32 arrays).

Operation

R[rd] = R[rs2] + (R[rs1] << 2);