There was a popular myth way back in the 90's that preincrement was always faster than postincrement because the former could generate a temporary. As if this were the case:

    /* x++ */
    inline int postincrement(int *x) {
      int temp = *x;
      *x = *x + 1;
      return temp;
    }

    /* ++x */
    inline int preincrement(int *x) {
      *x = *x + 1;
      return *x;
    }

But in typical usage, where the expression value is not used, it doesn't make any difference:

    for (int i = 0; i < 10; ++i) {

If one looks at the assembly, it's clearly equivalent to:

    for (int i = 0; i < 10; i++) {

Incidently, the latter seems more readable.