1  /* Copyright (C) 2004 Free Software Foundation.
       2  
       3     Check that constant folding of signbit, signbitf and signbitl math
       4     functions doesn't break anything and produces the expected results.
       5  
       6     Written by Roger Sayle, 28th January 2004.  */
       7  
       8  /* { dg-do link } */
       9  /* { dg-options "-O2" } */
      10  
      11  extern void link_error(void);
      12  
      13  extern int signbit(double);
      14  extern int signbitf(float);
      15  extern int signbitl(long double);
      16  
      17  int main()
      18  {
      19    if (signbit (1.0) != 0)
      20      link_error ();
      21    if (signbit (-2.0) == 0)
      22      link_error ();
      23  
      24    if (signbitf (1.0f) != 0)
      25      link_error ();
      26    if (signbitf (-2.0f) == 0)
      27      link_error ();
      28  
      29    if (signbitl (1.0l) != 0)
      30      link_error ();
      31    if (signbitl (-2.0f) == 0)
      32      link_error ();
      33  
      34    return 0;
      35  }
      36