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code-423n4 / 2021-10-tempus-findings

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Lower than uint256 storage variables #34

Closed code423n4 closed 2 years ago

code423n4 commented 2 years ago

Handle

pauliax

Vulnerability details

Impact

Lower than uint256 size storage variables are less gas efficient. E.g. using uint8 does not give any efficiency, actually, it is the opposite as EVM operates on default of 256-bit values so uint8 is more expensive in this case as it needs a conversion. It only gives improvements in cases where you can pack variables together, e.g. structs. An example where uint8 does not give any performance boost: for (uint8 i = 0; i < 32; i++)

Recommended Mitigation Steps

Consider using optimal uint256 values.

mijovic commented 2 years ago

This is a duplicate of https://github.com/code-423n4/2021-10-tempus-findings/issues/38 The quality of explanation in the linked issue is much better. Also, storage doesn't have to do anything with this issue and is mentioned here for some reason...