gcc/testsuite/gcc.dg/builtins-10.c

   1 /* Copyright (C) 2003 Free Software Foundation.
   2
   3    Check that constant folding of built-in math functions doesn't
   4    break anything and produces the expected results.
   5
   6    Written by Roger Sayle, 2nd April 2003.  */
   7
   8 /* { dg-do link } */
   9 /* { dg-options "-O2 -ffast-math" } */
  10
  11 extern void link_error(void);
  12
  13 extern double exp(double);
  14 extern double log(double);
  15 extern double sqrt(double);
  16 extern double pow(double,double);
  17 extern double fabs(double);
  18
  19 void test(double x)
  20 {
  21   /*if (sqrt(pow(x,4.0)) != x*x)
  22     link_error (); */
  23
  24   if (pow(sqrt(x),4.0) != x*x)
  25     link_error ();
  26
  27   if (pow(pow(x,4.0),0.25) != x)
  28     link_error ();
  29 }
  30
  31 void test2(double x, double y, double z)
  32 {
  33   if (sqrt(pow(x,y)) != pow(fabs(x),y*0.5))
  34     link_error ();
  35
  36   if (log(pow(x,y)) != y*log(x))
  37     link_error ();
  38
  39   if (pow(exp(x),y) != exp(x*y))
  40     link_error ();
  41
  42   if (pow(sqrt(x),y) != pow(x,y*0.5))
  43     link_error ();
  44
  45   if (pow(pow(x,y),z) != pow(x,y*z))
  46     link_error ();
  47 }
  48
  49 int main()
  50 {
  51   test (2.0);
  52   test2 (2.0, 3.0, 4.0);
  53   return 0;
  54 }
  55