Is there a performance difference between i++ and ++i in C?

Question

Is there a performance difference between `i++` and `++i` if the resulting value is not used?

Answer 1

Yes, ++i increments the variable directly

++i makes a temporary copy, increments the variable, and returns the copy. This slows down the increment.

You can also see this in the assembly code.

Google's style guideline now wants C++ programmers to use ++i whenever possible.

See the following: https://google.github.io/styleguide/cppguide.html#Preincrement_and_Predecrement