Step by step gas estimation

[luksgrin]

Remix has a fantastic debugger that let's you grab a transaction and allows you to see each opcode EVM executed step by step and so on. My question is: given an arbitrary transaction, is it possible somehow to get the amount of gas spent up to a certain point within the transaction? For example:

contract Test {
    uint256 a;
    uint256 b;
    uint256 c;


    function assignValues(uint256 _a, uin256 _b) external {

        a = _a;
        b = _b;
        c = _a*_b;
    }
}

Is there a way to know how much gas was spent up until b = _b when calling Test.assignValues(4, 7)? I imagine one could get all the EVM opcodes executed up until that point, and then manually adding the gas costs of each opcode... Is there an easier way?

[MatheusDaros]

The source of that info can be found in the famous Ethereum Yellow Paper. You can find a more handy spreadsheet here.