gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-56.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O -fdump-tree-fre1" } */
   3
   4 int x = 1;
   5 int __attribute__((noinline,noclone)) fn ()
   6 {
   7   return x;
   8 }
   9 int (*f)();
  10 int main ()
  11 {
  12   int res;
  13   f = fn;
  14   x = 0;
  15   res = f ();
  16   res += x;
  17   if (res != 0)
  18     __builtin_abort ();
  19   return 0;
  20 }
  21
  22 /* We should be able to optimize the load from x in main and thus the
  23    addition.  */
  24
  25 /* { dg-final { scan-tree-dump-times "= x;" 1 "fre1" } } */
  26 /* { dg-final { scan-tree-dump-times " \\\+ " 0 "fre1" } } */