gcc/testsuite/gcc.dg/tree-ssa/ssa-dom-thread-2b.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fdump-tree-thread1-stats -fdump-tree-dom2-stats -fdisable-tree-ethread" } */
   3
   4 void foo();
   5 void bla();
   6
   7 /* In the following case, we should be able to thread edge through
   8    the loop header.  */
   9
  10 void thread_latch_through_header (void)
  11 {
  12   int i = 0;
  13   int first = 1;
  14
  15   do
  16     {
  17       if (first)
  18         foo ();
  19
  20       first = 0;
  21       bla ();
  22     } while (i++ < 100);
  23 }
  24
  25 /* Threading the latch to a later point in the loop is safe in this
  26    case.  And we want to thread through the header as well.  These
  27    are both caught by threading in DOM.  */
  28 /* { dg-final { scan-tree-dump-not "Jumps threaded" "dom2"} } */
  29 /* { dg-final { scan-tree-dump-times "Jumps threaded: 1" 1 "thread1"} } */