Packer Code Style Findings

PRE-01C: Loop Iterator Optimizations

Type	Severity	Location
Gas Optimization		Packer.sol:L23, L50

Description:

The linked for loops increment / decrement their iterator "safely" due to Solidity's built - in safe arithmetics (post-0.8.X).

Example:

Copy
23for (uint256 i; i < count; ++i) {

Recommendation:

We advise the increment / decrement operations to be performed in an unchecked code block as the last statement within each for loop to optimize their execution cost.

Alleviation:

The Gnosis Guild team considered this exhibit but has opted not to apply it to avoid broad usage of the unchecked paradigm. As such, we consider this exhibit acknowledged.

PRE-02C: Optimization of Array Iteration

Type	Severity	Location
Gas Optimization		Packer.sol:L83-L85

Description:

As the Integrity::enforce function guarantees that the parent entries of the conditions array are defined in ascending order, it is possible to optimize the referenced comparison.

Example:

Copy
79} else {
80    uint256 length = conditions.length;
81    unchecked {
82        for (uint256 j = index + 1; j < length; ++j) {
83            if (conditions[j].parent != index) {
84                continue;
85            }
86            if (!_isInline(conditions, j)) {
87                return false;
88            }
89        }
90    }
91    return true;
92}

Recommendation:

We advise the code to perform a continue operation when conditions[j].parent < index and a break operation when conditions[j].parent > index, significantly optimizing the Packer::_isInline function's gas cost.

Alleviation:

The code was optimized per our recommendation, performing a continue or break operation based on the index by taking advantage of the conditions array's ascending order.