EIP-5478: CREATE2COPY Opcode


  Ethereum Improvement Proposals
        
        
          
            
              
            
          
        

        AllCoreNetworkingInterfaceERCMetaInformational

      



      
        
  
    

  
    
      🚧 Stagnant
    
    
    
    
    
      Standards Track: Core
    
  
  
    
      EIP-5478: CREATE2COPY Opcode
    
    
      
        
      
    
    
      
        
      
    
  

  Reducing the gas cost of contract creation with existing code

  	Authors	Qi Zhou (@qizhou)
	Created	2022-08-17
	Discussion Link	https://ethereum-magicians.org/t/eip-5478-reducing-the-gas-cost-of-contract-creation-with-existing-code/10419
	Requires	

  EIP-1014, 

  EIP-2929




  


  

  
    Table of Contents

    	Abstract
	Motivation
	Specification
    	Parameters


  
	Rationale
	Security Considerations
	Copyright



  


  
      
      
         Abstract
      
      
    


Adding a new opcode, CREATE2COPY, that is identical to CREATE2 but with potentially much lower gas cost by accepting an additional argument existing_contract_address that already stored the code of the new contract.

  
    
      
      
         Motivation
      
      
    


This EIP aims to reduce the smart contract creation cost of account abstraction (AA) contracts that have identical code.


The major cost of creating an AA contract is the contract creation cost, especially data gas. For example, creating an AA contract with 10,000 bytes will consume 2,000,000 data gas. Considering the code for each user’s AA contract is the same, CREATE2COPY can reduce the data gas cost to 2600 (cold account) or even 100 (warm account) if the contract code already exists in the local storage.

  
    
      
      
         Specification
      
      
    

  
    
      
      
         Parameters
      
      
    


	Constant	Value
	FORK_BLKNUM	TBD
	CREATE_DATA_GAS_PER_BYTE	200
	COLD_ACCOUNT_ACCESS_COST	2600
	WARM_ACCOUNT_ACCESS_COST	100



If block.number >= FORK_BLKNUM, a new opcode is added (CREATE2COPY) at 0xf6, which takes 5 stack arguments: endowment, memory_start, memory_length, salt, existing_contract_address. CREATE2COPY behaves identically to CREATE2 (0xf5 as defined in EIP-1014), except that the code hash of the creating contract MUST be the same as that of existing_contract_address.


CREATE2COPY has the same gas schema as CREATE2, but replacing the data gas from CREATE_DATA_GAS_PER_BYTE * CONTRACT_BYTES to the gas cost of EXTCODEHASH opcode, which is COLD_ACCOUNT_ACCESS_COST if the existing_contract_address is first-time accessed in the transaction or WARM_ACCOUNT_ACCESS_COST if existing_contract_address is already in the access list according to EIP-2929.


If the code of the contract returned from the init code differs from that of existing_contract_address, the creation fails with the error “mismatched contract creation code with existing code”, and will burn all gas for the contract creation.

  
    
      
      
         Rationale
      
      
    


TBD

  
    
      
      
         Security Considerations
      
      
    


Needs discussion.

  
    
      
      
         Copyright
      
      
    


Copyright and related rights waived via CC0.


  Citation

  Please cite this document as:

  
  Qi Zhou (@qizhou), "EIP-5478: CREATE2COPY Opcode [DRAFT]," Ethereum Improvement Proposals, no. 5478, August 2022. [Online serial]. Available: https://eips.ethereum.org/EIPS/eip-5478.






      
    
  

  

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        Ethereum Improvement Proposals (EIPs) describe standards for the Ethereum platform, including core protocol specifications, client APIs, and contract standards.