gnu/dist/gcc4/gcc/testsuite/gcc.dg/tree-ssa/alias-2.c

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