Nios® II Processor Reference Guide

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

8.5.13. blt

Instruction branch if less than signed
Operation

if ((signed) rA < (signed) rB)

then PC ←  PC + 4 + σ(IMM16)

else PC ←  PC + 4

Assembler Syntax

blt rA, rB,  label

Example

blt r6, r7, top_of_loop

Description

If (signed) rA < (signed) rB, then blt transfers program control to the instruction at label. In the instruction encoding, the offset given by IMM16 is treated as a signed number of bytes relative to the instruction immediately following blt. The two least-significant bits of IMM16 are always zero, because instruction addresses must be word-aligned.

Exceptions

Misaligned destination address

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 0x16

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