Really cool, it surprised me to see even trivial code give very different results in gcc,icc and clang.

  int retNum(int num, int num2) {
      return (num * num2)/num;
  }

gives this in clang

  retNum(int, int):     # @retNum(int, int)
        mov     eax, esi
        ret

While icc and gcc give

  retNum(int, int):
        mov     eax, esi
        imul    eax, edi
        cdq
        idiv    edi
        ret

  retNum(int, int):
        imul      esi, edi                                      
        mov       eax, esi                                     
        cdq                                                     
        idiv      edi                                           
        ret

The clang version at first sight seem right. But then thinking about it this is integer math.

  4/3 := 1

1 * 3 := 3 leads to 3 != 4 I believe gcc and icc returning 3 there is correct, while clang returning 4 is not. Maybe someone more C/int versed can tell us which are acceptable (knowing C both might be ok)