x64 Assembly and C++ Tutorial 32: String Instructions 1, Store String and the Repeat Prefix

In this tutorial we’ll start looking at the string instructions. They’re all pretty simple once you get the idea that they reference RSI, RDI and sometimes RAX implicitly. These (like the stack instructions) are just semi automated memory references. The instruction for this tutorial is Store String. There are 4 versions depending on what data size you’re working with. There’s also a version that takes a parameter but it does nothing the other four versions can’t handle and I think it’s misleading. We’ll