gcc/testsuite/gcc.dg/tree-ssa/alias-2.c

   1 /* { dg-do compile { target { nonpic || pie_enabled } } } */
   2 /* { dg-options "-O2 -fdump-tree-optimized" } */
   3 static int a;
   4 int f;
   5 void bar (void)  __attribute__((noinline));
   6 void bar (void)
   7 {
   8   f = 9;
   9 }
  10
  11 void link_error ();
  12
  13 int foo()
  14 {
  15   int b, c;
  16   a = 5;
  17   b = a;
  18   bar ();
  19   b = b + a;
  20   if (b != 10)
  21     link_error ();
  22   return b;
  23 }
  24
  25 /* We should have removed the link_error on the tree level as GCC can tell that
  26    a is not touched by the calling bar at all. */
  27 /* { dg-final { scan-tree-dump-times "link_error" 0 "optimized"} } */