ROR

Rotate Right

ROR rd, rs1, rs2

Rotates the bits in rs1 right by the amount in rs2.

Encoding

Binary Layout

0110000

31:25

rs2

24:20

rs1

19:15

101

14:12

rd

11:7

0110011

6:0

 

Format R-Type

Opcode 0x60005033

Extension Zbb

Operands

• rd
  Destination register (integer)
• rs1
  Source
• rs2
  Rotate Amount

Example

ROR x10, x11, x12

// Bitwise rotation.

Related

Across architectures

Rotate Left : how x86, ARM, RISC-V, and PowerISA each do this.

More in Zbb

Reference

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

Description

ROR rotates rs1 right by the shift amount in the lower log2(XLEN) bits of rs2, writing the result to rd.

Operation

shamt = R[rs2] & (XLEN-1); R[rd] = (R[rs1] >> shamt) | (R[rs1] << (XLEN-shamt));