Ask HW: How to find REX prefix, Modr/M, SIB, Displacement? in x86-64 assembly
How to find REX prefix, ModR/M, SIB, and Displacement bytes in x86-64 machine code?please explain step-by-step using the example instruction:mov rax, [r8 + rcx * 8 + 0x10]
BitShift_-
Re:Ask HN: Which processor to pick for learning assembly?
on Monday August 11, 2025 @11:30AM (#44865274)
I suggested x86 because CISC instructions are some of the most powerful, unlike RISC. Although x86 processors emit a lot of heat, they can handle almost any task, and Intel syntax is pretty easy to learn. If you want to say that x86 is difficult, then this is a fatal error. But it is really difficult if you write directly on machine codes (I do this, but rarely). But as a rule, no one does this anymore.