Would we get different results using a more compute intensive primitive operation (a multiply or divide) with a double variable instead of an add? Would the re

Would we get different results using a more compute intensive primitive operation (a multiply or divide) with a double variable instead of an add? Would the result in the first iteration just be due to some runtime overhead of Swift vs C (I am not sure what those are if any)? I can't imagine its just a loop optimization issue. I may be wrong though.