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Pre-compute contract deployment address #8

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Pre-compute contract deployment address #8

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26 changes: 26 additions & 0 deletions examples/PreCompute.sol
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Original file line number Diff line number Diff line change
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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract PreCompute {
// pre-compute by EOA and its nonce
function addressFrom(address _deployer, uint _nonce) external pure returns (address _address) {
bytes memory data;
if(_nonce == 0x00)
data = abi.encodePacked(bytes1(0xd6), bytes1(0x94), _deployer, bytes1(0x80));
else if(_nonce <= 0x7f)
data = abi.encodePacked(bytes1(0xd6), bytes1(0x94), _deployer, uint8(_nonce));
else if(_nonce <= 0xff)
data = abi.encodePacked(bytes1(0xd7), bytes1(0x94), _deployer, bytes1(0x81), uint8(_nonce));
else if(_nonce <= 0xffff)
data = abi.encodePacked(bytes1(0xd8), bytes1(0x94), _deployer, bytes1(0x82), uint16(_nonce));
else if(_nonce <= 0xffffff)
data = abi.encodePacked(bytes1(0xd9), bytes1(0x94), _deployer, bytes1(0x83), uint24(_nonce));
else
data = abi.encodePacked(bytes1(0xda), bytes1(0x94), _deployer, bytes1(0x84), uint32(_nonce));
bytes32 hash = keccak256(data);
assembly {
mstore(0, hash)
_address := mload(0)
}
}
}