2min chapter

Lex Fridman Podcast cover image

Jim Keller: Moore’s Law, Microprocessors, Abstractions, and First Principles

Lex Fridman Podcast

CHAPTER

The Performance Cost of Predicting a Branch

To get from a window of say 50 instructions to 500, it took three orders of magnitude or four orders of magnitude to four bits. Now if you get the prediction of a branch wrong, what happens then? Flush the pipe. So we're starting to look at stuff that says, so execute it down this path. And then you had two ways to go, but far away there's something that doesn't matter which path you went.

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