Comment explaining shift usage added

safe-global · Jan 10, 2025 · 0e26ab7 · 0e26ab7
1 parent 132ceab
commit 0e26ab7
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/contracts/common/StorageAccessible.sol b/contracts/common/StorageAccessible.sol
@@ -15,6 +15,7 @@ abstract contract StorageAccessible {
      * @return the bytes that were read.
      */
     function getStorageAt(uint256 offset, uint256 length) public view returns (bytes memory) {
+        // We use `<< 5` instead of `* 32` as SHR / SHL opcode only uses 3 gas, while DIV / MUL opcode uses 5 gas.
         bytes memory result = new bytes(length << 5);
         for (uint256 index = 0; index < length; index++) {
             /* solhint-disable no-inline-assembly */