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

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fdump-tree-dom2-details" } */
   3
   4 void foo();
   5 void bla();
   6 void bar();
   7
   8 /* Avoid threading in the following case, to prevent creating subloops.  */
   9
  10 void dont_thread_2 (int first)
  11 {
  12   int i = 0;
  13
  14   do
  15     {
  16       if (first)
  17         foo ();
  18       else
  19         bar ();
  20
  21       first = 0;
  22       bla ();
  23     } while (i++ < 100);
  24 }
  25
  26 /* Peeling off the first iteration would make threading through
  27    the loop latch safe, but we don't do that currently.  */
  28 /* { dg-final { scan-tree-dump-not "IRREDUCIBLE_LOOP" "dom2" } } */