gcc/testsuite/gcc.target/alpha/sqrt.c

   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 }