Nios® II Processor Reference Guide

ID 683836
Date 10/22/2020
Public
Document Table of Contents

8.5.78. rol

Instruction rotate left
Operation

rC ←  rA rotated left rB4..0 bit positions

Assembler Syntax

rol rC, rA, rB

Example

rol r6, r7, r8

Description

Rotates rA left by the number of bits specified in rB4..0 and stores the result in rC. The bits that shift out of the register rotate into the least-significant bit positions. Bits 31–5 of rB are ignored.

Exceptions

None

Instruction Type

R

Instruction Fields

A = Register index of operand rA

B = Register index of operand rB

C = Register index of operand rC

Bit Fields
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
A B C 0x03
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0x03 0 0x3a

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