gcc/testsuite/gcc.dg/tree-ssa/loadpre5.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fdump-tree-pre-stats" } */
   3 int p;
   4 int r;
   5 int a(void)
   6 {
   7   return p;
   8 }
   9 int main(int argc)
  10 {
  11   int q;
  12   q = a();
  13
  14   /* We should be able to move the call to a into the if path.
  15      in a perfect world, we'd actually decide that it can't touch
  16      r, and not recompute it at all!.  */
  17   if (argc)
  18     r = 9;
  19   return q + a();
  20 }
  21 /* { dg-final { scan-tree-dump-times "Eliminated: 1" 1 "pre"} } */
  22 /* { dg-final { cleanup-tree-dump "pre" } } */