EIP-5478: CREATE2COPY Opcode
Reducing the gas cost of contract creation with existing code
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.