Testing keccak in assembly.

KekTest.sol

// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.8.16;

contract KekTest {

    /// 22578
    function regHash(uint256 a, uint256 b) external pure returns (bytes32) {
        return keccak256(abi.encodePacked(a, b));
    }

    /// 22160
    function asmHash(uint256 a, uint256 b) external pure returns (bytes32 _hash) {
        assembly {
            mstore(0x00, a)
            mstore(0x20, b)
            _hash := keccak256(0x00, 64)
        }
    }

}