gcc/testsuite/gcc.dg/pr84309.c

   1 /* PR middle-end/84309 */
   2 /* { dg-do run { target c99_runtime } } */
   3 /* { dg-options "-O2 -ffast-math" } */
   4
   5 int
   6 main ()
   7 {
   8   unsigned long a = 1024;
   9   unsigned long b = 16 * 1024;
  10   unsigned long c = __builtin_pow (2, (__builtin_log2 (a) + __builtin_log2 (b)) / 2);
  11   if (c != 4096)
  12     __builtin_abort ();
  13   return 0;
  14 }