Want to actually understand how signed integer multiplication works at the CPU level? In this straight-to-the-point x86-64 assembly tutorial we dive into the IMUL instruction - the proper way to multiply signed integers in YASMNASM on Linux.br br We cover:br * The difference between unsigned (MUL) and signed (IMUL) multiplicationbr * Two-operand vs three-operand IMUL formsbr * Multiplying immediate values vs global variablesbr * Loading values into registers (mov) and performing fast multiplicationbr * Basic addition with ADD and INCbr * Full working example that prints results so you can see it in actionbr * Why you should respect the ABI and save callee-saved registers (R12-R15)br br Everything is built with YASM on Ubuntu, linked with a tiny C driver, and run instantly. No fluff, just real assembly code you can copy and run right now.br br Code on screen, calculator verification, and clear explanation of every line. Perfect if you're learning low-level programming, reverse engineering, or just want to know what really happens when you write a = b * c; in C.