C doesn't turn into some magical obtuse assembly with optimizations enabled, a loop will still be visible in some way but might vectorized, unrolled, eliminated

C doesn't turn into some magical obtuse assembly with optimizations enabled, a loop will still be visible in some way but might vectorized, unrolled, eliminated or even merged but you can still map it to the source. It's interesting to see what a compiler can do: ICC does some really fancy stuff such as eliminating whole chunks of code that are meant to help most compilers vectorize.