Nios® II Processor Reference Guide

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

8.5.40. cmpnei

Instruction compare not equal immediate
Operation

if (rA != σ(IMM16))

then rB ←  1

else rB ←  0

Assembler Syntax

cmpnei rB, rA, IMM16

Example

cmpnei r6, r7, 100

Description

Sign-extends the 16-bit immediate value IMM16 to 32 bits and compares it to the value of rA. If rA != σ(IMM16), then cmpnei stores 1 to rB; otherwise stores 0 to rB.

Usage

cmpnei performs the != operation of the C programming language.

Exceptions

None

Instruction Type

I

Instruction Fields

A = Register index of operand rA

B = Register index of operand rB

IMM16 = 16-bit signed immediate value

Bit Fields
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
A B IMM16
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
IMM16 0x18

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