Indirect branch restricted speculation

Okay kiddo, let me tell you what indirect branch restricted speculation means. Imagine you're playing a game of hide-and-seek, and your friend tells you to go find a toy in the toy box. Now, imagine there are lots of toys in the toy box, and you don't know which one to pick. That's what happens when a computer program encounters an indirect branch instruction. It's like the program needs to go find something in a big pile, but it doesn't know exactly where to look. To make things worse, some sneaky bad guys may try to trick the program into looking in the wrong place, or do something other than what it's supposed to do.

So, to keep the program safe, smart computer scientists came up with a way to help the program figure out which toy it should look for in the toy box. They call it "restricted speculation." It's like putting labels on the toys, so the program knows which one to pick. But, just like you need to be careful not to grab the wrong toy, the computer program needs to be careful not to do the wrong thing. That's why it's "restricted" - it can only look in certain places for the right toy.

Overall, indirect branch restricted speculation helps keep computer programs safe and make sure they do what they're supposed to do. It's like playing hide-and-seek with a good strategy, so you always find the toy you're looking for.