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/* { dg-do compile } */ 
/* { dg-options "-O2 -fdump-tree-vrp1-stats -fdump-tree-dom1-stats" } */
 
void foo();
void bla();
void bar();
 
/* In the following two cases, we should be able to thread edge through
   the loop header.  */
 
void thread_entry_through_header (void)
{
  int i;
 
  for (i = 0; i < 170; i++)
    bla ();
}
 
void thread_latch_through_header (void)
{
  int i = 0;
  int first = 1;
 
  do
    {
      if (first)
	foo ();
 
      first = 0;
      bla ();
    } while (i++ < 100);
}
 
/* This is a TODO -- it is correct to thread both entry and latch edge through
   the header, but we do not handle this case yet.  */
 
void dont_thread_1 (void)
{
  int i = 0;
  int first = 1;
 
  do
    {
      if (first)
	foo ();
      else
	bar ();
 
      first = 0;
      bla ();
    } while (i++ < 100);
}
 
/* Avoid threading in the following two cases, to prevent creating subloops.  */
 
void dont_thread_2 (int first)
{
  int i = 0;
 
  do
    {
      if (first)
	foo ();
      else
	bar ();
 
      first = 0;
      bla ();
    } while (i++ < 100);
}
 
void dont_thread_3 (int nfirst)
{
  int i = 0;
  int first = 0;
 
  do
    {
      if (first)
	foo ();
      else
	bar ();
 
      first = nfirst;
      bla ();
    } while (i++ < 100);
}
 
/* Avoid threading in this case, in order to avoid creating loop with
   multiple entries.  */
 
void dont_thread_4 (int a, int nfirst)
{
  int i = 0;
  int first;
 
  if (a)
    first = 0;
  else
    first = 1;
 
  do
    {
      if (first)
	foo ();
      else
	bar ();
 
      first = nfirst;
      bla ();
    } while (i++ < 100);
}
 
/* { dg-final { scan-tree-dump-times "Jumps threaded: 1" 1 "vrp1"} } */
/* { dg-final { scan-tree-dump-times "Jumps threaded: 2" 0 "vrp1"} } */
/* { dg-final { scan-tree-dump-times "Jumps threaded: 1" 0 "dom1"} } */
/* { dg-final { scan-tree-dump-times "Jumps threaded: 2" 1 "dom1"} } */
/* { dg-final { cleanup-tree-dump "dom1" } } */
/* { dg-final { cleanup-tree-dump "vrp1" } } */