From b4f2a46b35e662b1965bc2e144b2610e2456c30c Mon Sep 17 00:00:00 2001
From: Jay Paik <jay@alchemy.com>
Date: Wed, 13 Mar 2024 02:30:55 -0400
Subject: [PATCH] fix: optimize LightAccountFactory's _getCombinedSalt

---
 src/LightAccountFactory.sol | 8 ++++++--
 test/LightAccount.t.sol     | 2 +-
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/src/LightAccountFactory.sol b/src/LightAccountFactory.sol
index 74b6a28..e91dca9 100644
--- a/src/LightAccountFactory.sol
+++ b/src/LightAccountFactory.sol
@@ -45,7 +45,11 @@ contract LightAccountFactory {
         );
     }
 
-    function _getCombinedSalt(address owner, uint256 salt) internal pure returns (bytes32) {
-        return keccak256(abi.encode(owner, salt));
+    function _getCombinedSalt(address owner, uint256 salt) internal pure returns (bytes32 combinedSalt) {
+        assembly ("memory-safe") {
+            mstore(0x00, owner)
+            mstore(0x20, salt)
+            combinedSalt := keccak256(0x00, 0x40)
+        }
     }
 }
diff --git a/test/LightAccount.t.sol b/test/LightAccount.t.sol
index 0c9dee3..d4c835f 100644
--- a/test/LightAccount.t.sol
+++ b/test/LightAccount.t.sol
@@ -288,7 +288,7 @@ contract LightAccountTest is Test {
                     bytes32(uint256(uint160(0x0000000071727De22E5E9d8BAf0edAc6f37da032)))
                 )
             ),
-            0x61ded19e9e86ff20a3a8822529fb98ef584c1e9f6e1457dcfdcd1f5e146d7d97
+            0xa677af8a16ab66d988856a88ea647c45da368a588b036126ce3e21645f7891ca
         );
     }