Does this generate slower code? No, or at least not with an optimizing compiler. It was probably more about writing compact code. Personally, I'd have used ab

Does this generate slower code? No, or at least not with an optimizing compiler. It was probably more about writing compact code. Personally, I'd have used abs() and gotten rid of the temporary variable dd altogether: int SATD (void) { int satd = 0, k; for (k = 0; k < sizeof d / sizeof *d; ++k) satd += abs(d[k]); return satd; }