gcc/testsuite/gcc.dg/builtin-unreachable-2.c

   1 /* Check that __builtin_unreachable() is a no-return function thus
   2    causing the dead call to foo() to be removed.  The comparison is
   3    dead too, and should be removed.  */
   4 /* { dg-do compile } */
   5 /* { dg-options "-O2 -fdump-tree-optimized -fdump-rtl-cse1" } */
   6 void foo (void);
   7
   8 int
   9 f (int i)
  10 {
  11   if (i > 1)
  12     __builtin_unreachable();
  13   if (i > 1)
  14     foo ();
  15   return 1;
  16 }
  17 /* { dg-final { scan-tree-dump-not "foo" "optimized" } } */
  18 /* { dg-final { scan-rtl-dump-not "\\(if_then_else" "cse1" } } */
  19 /* { dg-final { cleanup-tree-dump "optimized" } } */
  20 /* { dg-final { cleanup-rtl-dump "cse1" } } */