gcc/testsuite/gcc.dg/builtins-27.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, 29th July 2003.  */
   7
   8 /* { dg-do link } */
   9 /* { dg-options "-O2 -ffast-math" } */
  10
  11 extern void link_error(void);
  12
  13 extern double pow(double,double);
  14
  15 void test(double x)
  16 {
  17   if (pow(x,2.0) != x*x)
  18     link_error ();
  19
  20   if (x*pow(x,2.0) != pow(x,3.0))
  21     link_error ();
  22
  23   if (pow(x,2.0)*x != pow(x,3.0))
  24     link_error ();
  25
  26   if (pow(x,3.0) != x*x*x)
  27     link_error ();
  28
  29   if (pow(x,2.0)*x != x*x*x)
  30     link_error ();
  31
  32   if (x*pow(x,2.0) != x*x*x)
  33     link_error ();
  34
  35   if (pow(x,3.0)/x != pow(x,2.0))
  36     link_error ();
  37
  38   if (pow(x,3.0)/x != x*x)
  39     link_error ();
  40 }
  41
  42 int main()
  43 {
  44   test (2.0);
  45   return 0;
  46 }
  47