qbe is an optimizing compiler backend which consumes programs in a simple intermediate language, optimizes them, and emits assembly for x86_64, aarch64, or riscv64, aiming to achieve "70% of the performance" of advanced compilers like LLVM in "10% of the code". This talk will briefly introduce qbe and its intermediate language, explain how it works and what it's capable of, and go over some sample programs which can be written in it.