⚡ Optimize WETH

.gas-snapshot

@@ -5,10 +5,10 @@ IETest:testCommandSendETH() (gas: 69457)
 IETest:testCommandSendUSDC() (gas: 135705)
 IETest:testCommandSwapDAI() (gas: 102148)
 IETest:testCommandSwapETH() (gas: 113640)
-IETest:testCommandSwapForETH() (gas: 123602)
-IETest:testCommandSwapUSDC() (gas: 157143)
+IETest:testCommandSwapForETH() (gas: 123456)
+IETest:testCommandSwapUSDC() (gas: 157129)
 IETest:testCommandSwapUSDCForWBTC() (gas: 165096)
-IETest:testDeploy() (gas: 2674498)
+IETest:testDeploy() (gas: 2660863)
 IETest:testENSNameOwnership() (gas: 84066)
 IETest:testIENameSetting() (gas: 8142)
 IETest:testPreviewCommandSendDecimals() (gas: 91972)

src/IE.sol

@@ -348,7 +348,7 @@ contract IE {
             );
         if (ETHOut) {
             uint256 amount = uint256(-(zeroForOne ? amount1Delta : amount0Delta));
-            IWETH(WETH).withdraw(amount);
+            _withdrawWETH(amount);
             payer.safeTransferETH(amount);
         }
     }
@@ -395,6 +395,14 @@ contract IE {
         }
     }
 
+    function _withdrawWETH(uint256 amount) internal virtual {
+        assembly ("memory-safe") {
+            mstore(0x00, 0x2e1a7d4d) // `withdraw(uint256)`.
+            mstore(0x20, amount) // Store the `amount` argument.
+            pop(call(gas(), WETH, 0, 0x1c, 0x24, 0x20, 0x20))
+        }
+    }
+
     /// ================== BALANCE & SUPPLY HELPERS ================== ///
 
     /// @dev Returns the balance of a named account in a named token.
@@ -666,11 +674,6 @@ interface IToken {
     function transfer(address, uint256) external returns (bool);
 }
 
-/// @dev Simple wrapped ether (WETH) token interface.
-interface IWETH {
-    function withdraw(uint256) external;
-}
-
 /// @notice Simple calldata executor interface.
 interface IExecutor {
     function execute(address, uint256, bytes calldata) external payable returns (bytes memory);