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
  18 void test(double x)
  19 {
  20   if (sqrt(pow(x,4.0)) != x*x)
  21     link_error ();
  22
  23   if (pow(sqrt(x),4.0) != x*x)
  24     link_error ();
  25
  26   if (pow(pow(x,4.0),0.25) != x)
  27     link_error ();
  28 }
  29
  30 void test2(double x, double y, double z)
  31 {
  32   if (sqrt(pow(x,y)) != pow(x,y*0.5))
  33     link_error ();
  34
  35   if (log(pow(x,y)) != y*log(x))
  36     link_error ();
  37
  38   if (pow(exp(x),y) != exp(x*y))
  39     link_error ();
  40
  41   if (pow(sqrt(x),y) != pow(x,y*0.5))
  42     link_error ();
  43
  44   if (pow(pow(x,y),z) != pow(x,y*z))
  45     link_error ();
  46 }
  47
  48 int main()
  49 {
  50   test (2.0);
  51   test2 (2.0, 3.0, 4.0);
  52   return 0;
  53 }
  54