Solidity v0.8.15 is here! - Two important bugs, cheaper IR code and more

Announcements
1

Solidity 0.8.15 fixes two important bugs:

  • The first bug can cause memory writes in inline assembly blocks to be incorrectly removed. While we do not expect a lot of affected cases in practice, we still assigned it a severity of “medium”, since the consequences in affected cases can be severe. You can find more information in our blog post.

  • The second bug dates back to the very first versions of Solidity: When copying bytes arrays from calldata or memory to storage, some dirty bytes may be copied along, and may become visible after a .push() on the array. We assigned a severity of “low”.

On top of this, the release includes several minor bug fixes and improvements. For instance, the inlining heuristics for optimizing via-IR code was improved, resulting in notable code size and gas improvements, as seen at the overall differences between 0.8.14 and 0.8.15 that we observed when using the IR-based pipeline to run test suites of several real-life projects in our CI:

project Bytecode size Deployment gas Runtime gas
ENS -4.85% ✅ -0.29% ✅
Euler -2.43% ✅ -1.68% ✅ -2.08% ✅
Gnosis Safe -3.87% ✅ -4.31% ✅ -0.02% ✅
Gnosis Protocol v2 -3.95% ✅ -2.55% ✅ -0.07% ✅
Perpetual Pools -4.55% ✅ -2.64% ✅ -1% ✅
Pool Together -7.09% ✅ -5.59% ✅ -0.37% ✅
PRBMath -3.56% ✅ -3.49% ✅
Trident -9.84% ✅ -7.98% ✅ -6.26% ✅
Uniswap v3 -4.32% ✅ -4.53% ✅ -1.24% ✅
Yield Liquidator -7.13% ✅ -6.08% ✅ -0.5% ✅
OpenZeppelin -7.83% ✅ -6.01% ✅ -0.28% ✅

:open_book: Solidity 0.8.15 Release Announcement | Solidity Blog
:floppy_disk: Release Version 0.8.15 · ethereum/solidity · GitHub

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