Learn Conditional Branching in x86-64 Assembly (YASM/NASM) - CMP, JE, JNE, JL, JG & More

In this practical x86-64 assembly language tutorial we dive deep into conditional branching using YASM (also works with NASM) on Ubuntu/Linux.

We cover:
The CMP instruction and how it sets the RFLAGS register
All major conditional jump instructions (JE, JNE, JL, JLE, JG, JGE, JB, JBE...)
Important difference between signed (JL/JG) vs unsigned (JB/JA) jumps
Real code examples showing how to implement if-style decisions
How to handle the "jump out of range" assembler error
Visual flow diagrams explaining control flow

Perfect for students learning low-level programming, reverse engineering, operating systems, or anyone who wants to understand how if-statements, comparisons, and decisions are actually implemented at the machine level.

Highly recommended companion resource: Professor Ed Jorgensen's free x86-64 Assembly Language Programming book (linked in comments).

Enjoy learning assembly!

Intro to Conditional Branching in Assembly 00:00:00
Recommended Book: x86-64 Guide by Ed Jorgensen 00:00:23
Unconditional vs Conditional Jumps 00:01:39
How Conditional Branching Works 00:02:06
The CMP Instruction Explained 00:03:21
Overview of Conditional Jump Instructions 00:04:50
Signed vs Unsigned Jump Instructions 00:06:10
Jump Equal & Jump Not Equal (JE/JNE) 00:07:00
Main Conditional Jumps Summary 00:08:14
Starting the Code Example 00:09:09
Program Structure & Printing Setup 00:10:35
Function Prologue & Getting User Input 00:13:21
First Branch: Is Number Greater Than 0? 00:15:17
Live Demo: Testing Greater Than Zero 00:21:53
Second Branch: Is Number Less Than 10? 00:22:52
Live Demo: Testing Range 0-10 00:26:06
Third Branch: Is Number == 5? 00:26:52
Live Demo: Testing Equal to 5 00:28:00
Jump Out of Range Error & Workaround 00:29:00
Final Summary & Closing 00:32:17
Thanks & Call to Subscribe 00:32:57

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