gcc/testsuite/gcc.dg/builtins-11.c

   1 /* Copyright (C) 2003,2007 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 cbrt(double);
  16 extern double pow(double,double);
  17
  18 void test(double x, double y, double z)
  19 {
  20   if (sqrt(x)*sqrt(x) != x)
  21     link_error ();
  22
  23   if (sqrt(x)*sqrt(y) != sqrt(x*y))
  24     link_error ();
  25
  26   if (exp(x)*exp(y) != exp(x+y))
  27     link_error ();
  28
  29   if (pow(x,y)*pow(z,y) != pow(z*x,y))
  30     link_error ();
  31
  32   if (pow(x,y)*pow(x,z) != pow(x,y+z))
  33     link_error ();
  34
  35   if (x/exp(y) != x*exp(-y))
  36     link_error ();
  37
  38   if (x/pow(y,z) != x*pow(y,-z))
  39     link_error ();
  40
  41   if (x/sqrt(y/z) != x*sqrt(z/y))
  42     link_error ();
  43
  44   if (x/cbrt(y/z) != x*cbrt(z/y))
  45     link_error ();
  46 }
  47
  48 int main()
  49 {
  50   test (2.0, 3.0, 4.0);
  51   return 0;
  52 }
  53