gcc/testsuite/gcc.dg/fixed-point/noassoc.c

/* { dg-do run } */
/* { dg-options "-std=gnu99 -O0" } */

extern void abort (void);

/* Make sure GCC knows there is no associativity for saturating types.  */

/* Don't transform to (temp + (0.5r + 0.8r))  */
_Sat _Fract add_test (_Sat _Fract temp)
{
  return temp + 0.5r + 0.8r;
}

/* Don't transform to (temp * ((-0.5r - 0.5r) * (-0.5r - 0.5r)))  */
_Sat _Fract mul_test (_Sat _Fract temp)
{
  return temp * (-0.5r - 0.5r) * (-0.5r - 0.5r);
}

/* Don't transform to ((temp1 + temp2) * 0.5r)  */
_Sat _Fract mul_add_test (_Sat _Fract temp1, _Sat _Fract temp2)
{
  return temp1 * 0.5r + temp2 * 0.5r;
}

/* Don't transform to ((temp1 - temp2) * 0.5r)  */
_Sat _Fract mul_sub_test (_Sat _Fract temp1, _Sat _Fract temp2)
{
  return temp1 * 0.5r - temp2 * 0.5r;
}

int main ()
{
  _Sat _Fract a;

  a = add_test (-0.5r);
  if (a != 0.8r)
    abort ();

  a = mul_test (0.1r);
  if (a != 0.1r)
    abort ();

  a = mul_add_test (0.75r, 0.5r);
  if (a != 0.625r)
    abort ();

  a = mul_sub_test (0.75r, -0.5r);
  if (a != 0.625r)
    abort ();

  return 0;
}