modernc.org/cc@v1.0.1/testdata/gcc-6.3.0/gcc/testsuite/gcc.c-torture/execute/ieee/unsafe-fp-assoc.c (about)

     1  #include <float.h>
     2  
     3  extern void abort(void);
     4  
     5  static const double C = DBL_MAX;
     6  
     7  double foo(double x)
     8  {
     9          return ( ( (x * C) * C ) * C);
    10  }
    11  
    12  int main ()
    13  {
    14    double d = foo (0.0);
    15    if (d != 0.0)
    16     abort ();
    17  
    18    return 0;
    19  }