gcc/testsuite/gcc.dg/builtins-11.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, 5th 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 sqrt(double);
  15 extern double pow(double,double);
  16
  17 void test(double x, double y, double z)
  18 {
  19   if (sqrt(x)*sqrt(x) != x)
  20     link_error ();
  21
  22   if (sqrt(x)*sqrt(y) != sqrt(x*y))
  23     link_error ();
  24
  25   if (exp(x)*exp(y) != exp(x+y))
  26     link_error ();
  27
  28   if (pow(x,y)*pow(z,y) != pow(z*x,y))
  29     link_error ();
  30
  31   if (pow(x,y)*pow(x,z) != pow(x,y+z))
  32     link_error ();
  33
  34   if (x/exp(y) != x*exp(-y))
  35     link_error ();
  36
  37   if (x/pow(y,z) != x*pow(y,-z))
  38     link_error ();
  39 }
  40
  41 int main()
  42 {
  43   test (2.0, 3.0, 4.0);
  44   return 0;
  45 }
  46