1  /* glibc bug, https://sourceware.org/ml/libc-alpha/2017-04/msg00256.html
       2     When using software completions, we have to prevent assembler to match
       3     input and output operands of sqrtt/sqrtf insn.  Fixed in glibc 2.26.  */
       4  /* { dg-do run } */
       5  /* { dg-options "-O2 -fno-builtin-sqrt -mieee" } */
       6  
       7  double sqrt (double);
       8  
       9  static double
      10  float64frombits (unsigned long b)
      11  {
      12    union { unsigned long __b; double __d; } u = { .__b = b };
      13    return u.__d;
      14  }
      15  
      16  int
      17  main (void)
      18  {
      19    double a = float64frombits (2);
      20  
      21    if (sqrt (a) != 3.1434555694052576e-162)
      22      __builtin_abort ();
      23  
      24    return 0;
      25  }