gcc/testsuite/gcc.dg/pow-sqrt.x

   1
   2 extern void abort (void);
   3
   4
   5 __attribute__((noinline)) double
   6 real_pow (double x, double pow_exp)
   7 {
   8   return __builtin_pow (x, pow_exp);
   9 }
  10
  11 #define EPS (0.000000000000000000001)
  12
  13 #define SYNTH_POW(X, Y) __builtin_pow (X, Y)
  14 volatile double arg;
  15
  16 int
  17 main (void)
  18 {
  19   double i_arg = 0.1;
  20
  21   for (arg = i_arg; arg < 100.0; arg += 1.0)
  22     {
  23       double synth_res = SYNTH_POW (arg, EXPN);
  24       double real_res = real_pow (arg, EXPN);
  25
  26       if (__builtin_abs (SYNTH_POW (arg, EXPN) - real_pow (arg, EXPN)) > EPS)
  27         abort ();
  28     }
  29   return 0;
  30 }