Nios® II Processor Reference Guide

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

8.5.60. movhi

Instruction move immediate into high halfword
Operation

rB ←  (IMMED : 0x0000)

Assembler Syntax

movhi rB, IMMED

Example

movhi r6, 0x8000

Description

Writes the immediate value IMMED into the high halfword of rB, and clears the lower halfword of rB to 0x0000.

Usage

The maximum allowed value of IMMED is 65535. The minimum allowed value is 0. To load a 32-bit constant into a register, first load the upper 16 bits using a movhi pseudo-instruction. The %hi() macro can be used to extract the upper 16 bits of a constant or a label. Then, load the lower 16 bits with an ori instruction. The %lo() macro can be used to extract the lower 16 bits of a constant or label as shown in the following code:

movhi rB, %hi(value)

ori rB, rB, %lo(value)

An alternative method to load a 32-bit constant into a register uses the %hiadj() macro and the addi instruction as shown in the following code:

movhi rB, %hiadj(value)

addi rB, rB, %lo(value)

Pseudo-instruction

movhi is implemented as orhi rB, r0, IMMED.

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