Gas Optimization

In some specific cases, assembly, and its full control over memory, is the most efficient way to optimize a snippet of code.

Practice using inline assembly in your Solidity smart contracts to further optimize them, to an extent vanilla Solidity does not offer!

Optimization Challenge

You see Luc’s mistake, but before you can speak, his mead explodes in a cloud of icy vapor. Shards of ice burst up into the rafters and float down onto the heads of the tavern’s patrons. 

Luc looks over at you, his jaw agape, and shortly he bursts into laughter. His amusement at his own folly spreads to you, and soon the rest of the tavern. As you laugh, you glance down to see a perfect sphere of ice hovering above your tankard. The others slap you on the shoulders, congratulating you on your second victory. 

I guess I hadn’t perfected my spell as much as I thought, well done guardian!

Your new friends shake your hand, and a round of fresh drinks is ordered. You spend the rest of the night laughing and swapping stories with this group of newfound companions. You cannot wait to see what other adventures await you in the world of Spell Tuning.

The mages around the table settle back, ready to hear the next challenge. 

Warm mead is no fun! For the next round let’s see who can freeze their mead into a block of ice first!

Everyone leans over their mugs, concentrating on their spells. You concentrate, clear your mind and cast your ice spell. Slowly your mead begins to form into a ball of ice. 

But your eye is caught by what Luc is doing across from you… 

In this quest, we have seen how inline assembly can achieve aggressive optimization and help drastically lower gas consumption.

Batching operations is a recurring strategy in programming. Similar to how it can help lower the execution time in traditional contexts, it can be used to reduce gas consumption in Solidity.

The use of inline assembly gives you reins to the EVM's memory. However, be aware that you outside the assembly block, Solidity still expects its <a class="richtext rt-link" target="_blank" rel="noopener noreferrer" href="https://docs.soliditylang.org/en/latest/assembly.html#memory-safety">memory model</a> to be maintained. It is hence, your responsibility to make sure your assembly code respects this model.

In some specific cases, assembly, and its full control over memory, is the most efficient way to optimize a snippet of code.

Practice using inline assembly in your Solidity smart contracts to further optimize them, to an extent vanilla Solidity does not offer!

Assembly Optimization

Here is an odd puzzle for any self-proclaimed EVM master. See if you can build an "Ouroboros", and prove your mastery over low-level bytecode sorcery.

Finding Ouroboros

Starknet contracts support state variables, but how they live in contract storage is generally abstracted away from the typical developer. In this quest, we will take a peek under the hood and see how state variables are stored exactly.

Starknet Storage Layout

Do you know how low-level calls work in Starknet? Or how calldata is encoded? This knowledge could be useful for on-chain sleuthing and some other advanced use cases. 

Learn about the inner workings of calls and calldata in this fun interface spoofing exercise!

Calldata Spoofing

Starknet contract addresses, like in many other blockchains, can be precomputed too. This allows for the creation of vanity addresses.

In this quest, see if you can deploy your smart contract under a specified address pattern...

Vanity Addresses

Can we build an EVM inside of an EVM? That seems like a strange question, but the answer is yes we can! In this quest, we will build a self-hosted EVM (sEVM), squeezed into a single smart contract. By rebuilding the EVM, develop a deeper appreciation of the machine's inner workings and EVM bytecode.