Gas Optimizations

[code423n4]

where necessary, do the following:

• Use a do while loop in place of a for loop
• Don't initialize loop variable uint256 i as = 0
• Use ++i instead of i++ (within an unchecked block to prevent unnecessary safeMath)

e.g. replace:

for (uint256 i = 0; i < n; i++) {
    ...
}

with:

uint256 i;
do {
    ...
    unchecked {
       ++i;
    }
} while (i < num);

in the following locations:

• https://github.com/ProjectOpenSea/seaport/blob/6c24d09fc4be9bbecf749e6a7a592c8f7b659405/contracts/conduit/Conduit.sol#L66

• https://github.com/ProjectOpenSea/seaport/blob/6c24d09fc4be9bbecf749e6a7a592c8f7b659405/contracts/conduit/Conduit.sol#L130

• https://github.com/ProjectOpenSea/seaport/blob/6c24d09fc4be9bbecf749e6a7a592c8f7b659405/contracts/lib/BasicOrderFulfiller.sol#L948

• https://github.com/ProjectOpenSea/seaport/blob/6c24d09fc4be9bbecf749e6a7a592c8f7b659405/contracts/lib/BasicOrderFulfiller.sol#L1040

• https://github.com/ProjectOpenSea/seaport/blob/6c24d09fc4be9bbecf749e6a7a592c8f7b659405/contracts/lib/CriteriaResolution.sol#L56

• https://github.com/ProjectOpenSea/seaport/blob/6c24d09fc4be9bbecf749e6a7a592c8f7b659405/contracts/lib/CriteriaResolution.sol#L166

• https://github.com/ProjectOpenSea/seaport/blob/6c24d09fc4be9bbecf749e6a7a592c8f7b659405/contracts/lib/CriteriaResolution.sol#L184

• https://github.com/ProjectOpenSea/seaport/blob/6c24d09fc4be9bbecf749e6a7a592c8f7b659405/contracts/lib/CriteriaResolution.sol#L199

• https://github.com/ProjectOpenSea/seaport/blob/6c24d09fc4be9bbecf749e6a7a592c8f7b659405/contracts/lib/OrderCombiner.sol#L181

• https://github.com/ProjectOpenSea/seaport/blob/6c24d09fc4be9bbecf749e6a7a592c8f7b659405/contracts/lib/OrderCombiner.sol#L247

• https://github.com/ProjectOpenSea/seaport/blob/6c24d09fc4be9bbecf749e6a7a592c8f7b659405/contracts/lib/OrderCombiner.sol#L291

• https://github.com/ProjectOpenSea/seaport/blob/6c24d09fc4be9bbecf749e6a7a592c8f7b659405/contracts/lib/OrderCombiner.sol#L373

• https://github.com/ProjectOpenSea/seaport/blob/6c24d09fc4be9bbecf749e6a7a592c8f7b659405/contracts/lib/OrderCombiner.sol#L473

• https://github.com/ProjectOpenSea/seaport/blob/6c24d09fc4be9bbecf749e6a7a592c8f7b659405/contracts/lib/OrderCombiner.sol#L498

• https://github.com/ProjectOpenSea/seaport/blob/6c24d09fc4be9bbecf749e6a7a592c8f7b659405/contracts/lib/OrderCombiner.sol#L577

• https://github.com/ProjectOpenSea/seaport/blob/6c24d09fc4be9bbecf749e6a7a592c8f7b659405/contracts/lib/OrderCombiner.sol#L598

• https://github.com/ProjectOpenSea/seaport/blob/6c24d09fc4be9bbecf749e6a7a592c8f7b659405/contracts/lib/OrderCombiner.sol#L621

• https://github.com/ProjectOpenSea/seaport/blob/6c24d09fc4be9bbecf749e6a7a592c8f7b659405/contracts/lib/OrderCombiner.sol#L754

• https://github.com/ProjectOpenSea/seaport/blob/6c24d09fc4be9bbecf749e6a7a592c8f7b659405/contracts/lib/OrderFulfiller.sol#L217

• https://github.com/ProjectOpenSea/seaport/blob/6c24d09fc4be9bbecf749e6a7a592c8f7b659405/contracts/lib/OrderFulfiller.sol#L306

• https://github.com/ProjectOpenSea/seaport/blob/6c24d09fc4be9bbecf749e6a7a592c8f7b659405/contracts/lib/OrderFulfiller.sol#L471

• https://github.com/ProjectOpenSea/seaport/blob/6c24d09fc4be9bbecf749e6a7a592c8f7b659405/contracts/lib/OrderValidator.sol#L272

• https://github.com/ProjectOpenSea/seaport/blob/6c24d09fc4be9bbecf749e6a7a592c8f7b659405/contracts/lib/OrderValidator.sol#L350