Introduction

This piece is a surgical analysis and explanation of an underrated presentation called The Dark Arts of Yul, about esoteric gas-optimization techniques in Yul, given by our very own @optimizoor on @SolidityFridays:

https://youtu.be/ew3pfnb2_V8

This article assumes that its readers have a basic familiarity with Ethereum, its smart-contract programming language, Solidity, and its intermediate assembly-like language, Yul.

Table of Contents

1. Quick Brush-ups
2. Scratch Space++
3. Bit Safety/Security
4. Inlining
5. General Tips
6. SumDemo
   1. SumDemo0
   2. SumDemo1
   3. SumDemo2
   4. SumDemo3
   5. SumDemo4
   6. SumDemo5
   7. SumDemo6
   8. SumDemo7
7. LookupDemo
   1. LookupDemo0
   2. LookupDemo1-2
8. MaskingDemo
   1. MaskingDemo0
   2. MaskingDemo1
   3. MaskingDemo2
   4. MaskingDemo3
9. ECDSA
10. LibClone