@@ -1040,6 +1040,41 @@ branch_prob (void)
fprintf (dump_file, "Adding fake entry edge to bb %i\n",
bb->index);
make_edge (ENTRY_BLOCK_PTR, bb, EDGE_FAKE);
+ /* Avoid bbs that have both fake entry edge and also some
+ exit edge. One of those edges wouldn't be added to the
+ spanning tree, but we can't instrument any of them. */
+ if (have_exit_edge || need_exit_edge)
+ {
+ gimple_stmt_iterator gsi;
+ gimple first;
+ tree fndecl;
+
+ gsi = gsi_after_labels (bb);
+ gcc_checking_assert (!gsi_end_p (gsi));
+ first = gsi_stmt (gsi);
+ if (is_gimple_debug (first))
+ {
+ gsi_next_nondebug (&gsi);
+ gcc_checking_assert (!gsi_end_p (gsi));
+ first = gsi_stmt (gsi);
+ }
+ /* Don't split the bbs containing __builtin_setjmp_receiver
+ or __builtin_setjmp_dispatcher calls. These are very
+ special and don't expect anything to be inserted before
+ them. */
+ if (!is_gimple_call (first)
+ || (fndecl = gimple_call_fndecl (first)) == NULL
+ || DECL_BUILT_IN_CLASS (fndecl) != BUILT_IN_NORMAL
+ || (DECL_FUNCTION_CODE (fndecl) != BUILT_IN_SETJMP_RECEIVER
+ && (DECL_FUNCTION_CODE (fndecl)
+ != BUILT_IN_SETJMP_DISPATCHER)))
+ {
+ if (dump_file)
+ fprintf (dump_file, "Splitting bb %i after labels\n",
+ bb->index);
+ split_block_after_labels (bb);
+ }
+ }
}
}
@@ -0,0 +1,43 @@
+/* PR middle-end/44777 */
+/* { dg-options "-O0" } */
+/* A variant of gcc.c-torture/execute/comp-goto-2.c. */
+
+extern void abort (void);
+extern void exit (int);
+
+#ifdef STACK_SIZE
+#define DEPTH ((STACK_SIZE) / 512 + 1)
+#else
+#define DEPTH 1000
+#endif
+
+#if ! defined (NO_LABEL_VALUES) && !defined (NO_TRAMPOLINES)
+int
+x (int a)
+{
+ __label__ xlab;
+ void y (int a)
+ {
+ void *x = &&llab;
+ if (a==-1)
+ goto *x;
+ if (a==0)
+ goto xlab;
+ llab:
+ y (a-1);
+ }
+ y (a);
+ xlab:;
+ return a;
+}
+#endif
+
+int
+main ()
+{
+#if ! defined (NO_LABEL_VALUES) && !defined (NO_TRAMPOLINES)
+ if (x (DEPTH) != DEPTH)
+ abort ();
+#endif
+ exit (0);
+}