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contracts...eip-196-197.sol

// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.7.0 <0.9.0;

contract EIP_196_197 {
    
    // After calling testAdd() output variable cointains these values:
    //   - output[0] == 0x030644e72e131a029b85045b68181585d97816a916871ca8d3c208c16d87cfd3
    //   - output[1] == 0x15ed738c0e0a7c92e7845f96b2ae9c0a68a6a449e3538fc7ff3ebf7a5a18a2c4
    uint256[2] public output;

    function testAdd() public returns (bool success, uint256[2] memory _output){

        uint256[4] memory input;
        input[0] = 1;
        input[1] = 2;
        input[2] = 1;
        input[3] = 2;

        assembly {
            // Address 0x6 == ecAdd
            success := staticcall(sub(gas(), 2000), 0x6, input, 128, _output, 64)
        }
        output = _output;
    }

}