Optimize ERC1167 proxy creation code by 1 opcode (OpenZeppelin#3329)

Author: Philogy

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## Unreleased
  * `ERC2981`: make `royaltiInfo` public to allow super call in overrides. ([#3305](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3305))
+ * `Clones`: optimize clone creation ([#3329](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3329))
  * `TimelockController`: Migrate `_call` to `_execute` and allow inheritance and overriding similar to `Governor`. ([#3317](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3317))
 
 ## Unreleased

contracts/proxy/Clones.sol

@@ -25,10 +25,10 @@ library Clones {
     function clone(address implementation) internal returns (address instance) {
         assembly {
             let ptr := mload(0x40)
-            mstore(ptr, 0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000000000000000000000)
-            mstore(add(ptr, 0x14), shl(0x60, implementation))
-            mstore(add(ptr, 0x28), 0x5af43d82803e903d91602b57fd5bf30000000000000000000000000000000000)
-            instance := create(0, ptr, 0x37)
+            mstore(ptr, 0x602d8060093d393df3363d3d373d3d3d363d7300000000000000000000000000)
+            mstore(add(ptr, 0x13), shl(0x60, implementation))
+            mstore(add(ptr, 0x27), 0x5af43d82803e903d91602b57fd5bf30000000000000000000000000000000000)
+            instance := create(0, ptr, 0x36)
         }
         require(instance != address(0), "ERC1167: create failed");
     }
@@ -43,10 +43,10 @@ library Clones {
     function cloneDeterministic(address implementation, bytes32 salt) internal returns (address instance) {
         assembly {
             let ptr := mload(0x40)
-            mstore(ptr, 0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000000000000000000000)
-            mstore(add(ptr, 0x14), shl(0x60, implementation))
-            mstore(add(ptr, 0x28), 0x5af43d82803e903d91602b57fd5bf30000000000000000000000000000000000)
-            instance := create2(0, ptr, 0x37, salt)
+            mstore(ptr, 0x602d8060093d393df3363d3d373d3d3d363d7300000000000000000000000000)
+            mstore(add(ptr, 0x13), shl(0x60, implementation))
+            mstore(add(ptr, 0x27), 0x5af43d82803e903d91602b57fd5bf30000000000000000000000000000000000)
+            instance := create2(0, ptr, 0x36, salt)
         }
         require(instance != address(0), "ERC1167: create2 failed");
     }
@@ -61,13 +61,13 @@ library Clones {
     ) internal pure returns (address predicted) {
         assembly {
             let ptr := mload(0x40)
-            mstore(ptr, 0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000000000000000000000)
-            mstore(add(ptr, 0x14), shl(0x60, implementation))
-            mstore(add(ptr, 0x28), 0x5af43d82803e903d91602b57fd5bf3ff00000000000000000000000000000000)
-            mstore(add(ptr, 0x38), shl(0x60, deployer))
-            mstore(add(ptr, 0x4c), salt)
-            mstore(add(ptr, 0x6c), keccak256(ptr, 0x37))
-            predicted := keccak256(add(ptr, 0x37), 0x55)
+            mstore(ptr, 0x602d8060093d393df3363d3d373d3d3d363d7300000000000000000000000000)
+            mstore(add(ptr, 0x13), shl(0x60, implementation))
+            mstore(add(ptr, 0x27), 0x5af43d82803e903d91602b57fd5bf3ff00000000000000000000000000000000)
+            mstore(add(ptr, 0x37), shl(0x60, deployer))
+            mstore(add(ptr, 0x4b), salt)
+            mstore(add(ptr, 0x6b), keccak256(ptr, 0x36))
+            predicted := keccak256(add(ptr, 0x36), 0x55)
         }
     }