gcc/

[pf3gnuchains/gcc-fork.git] / gcc / profile.c

diff --git a/gcc/profile.c b/gcc/profile.c
index 201f6cd..10ab756 100644 (file)
--- a/gcc/profile.c
+++ b/gcc/profile.c
@@ -1,6 +1,6 @@
 /* Calculate branch probabilities, and basic block execution counts.
    Copyright (C) 1990, 1991, 1992, 1993, 1994, 1996, 1997, 1998, 1999,
-   2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010
+   2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011, 2012
    Free Software Foundation, Inc.
    Contributed by James E. Wilson, UC Berkeley/Cygnus Support;
    based on some ideas from Dain Samples of UC Berkeley.
@@ -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);
+               }
+           }
        }
     }