Instructional Assembly Demo

contract InstructionalAssemblyDemo {
    function assemblyLoop() public view returns (uint result) {
        assembly {
            // i = 0
            let i := 0

            loop:
                // result += i
                result := add(result, i)

                // i++
                i := add(i, 1)

                // if (i < 10) loop again
                jumpi(loop, lt(i, 10))
        }
    }

    function instrAssemblyLoop() public view returns (uint result) {
        assembly {
            // i = 0
            0
            loop:
                // result += i
                    // make a copy of result
                    dup2
                    // make a copy of i
                    dup2
                    // add them together
                    add
                    // assign the result of op to result
                    swap2
                    // remove the leftovers
                    pop

                // i++
                    1
                    add

                // if (i < 10) loop again
                    // push constant 10 to the stack
                    10
                    // push i to the top of stack
                    dup2
                    // i < 10
                    lt
                    // push the tag to top of the stack
                    loop
                    // jumpi(loop, lt(i, 10))
                    jumpi

            pop
        }
    }
}