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.
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.
| 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.
TBD
Needs discussion.
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