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[pf3gnuchains/gcc-fork.git] / gcc / tree-predcom.c

diff --git a/gcc/tree-predcom.c b/gcc/tree-predcom.c
index 751bdeb..1566902 100644 (file)
--- a/gcc/tree-predcom.c
+++ b/gcc/tree-predcom.c
@@ -1,5 +1,5 @@
 /* Predictive commoning.
-   Copyright (C) 2005, 2007, 2008, 2009, 2010, 2011
+   Copyright (C) 2005, 2007, 2008, 2009, 2010, 2011, 2012
    Free Software Foundation, Inc.
 
 This file is part of GCC.
@@ -1707,6 +1707,7 @@ remove_stmt (gimple stmt)
     {
       name = PHI_RESULT (stmt);
       next = single_nonlooparound_use (name);
+      reset_debug_uses (stmt);
       psi = gsi_for_stmt (stmt);
       remove_phi_node (&psi, true);
 
@@ -1728,6 +1729,7 @@ remove_stmt (gimple stmt)
       gcc_assert (TREE_CODE (name) == SSA_NAME);
 
       next = single_nonlooparound_use (name);
+      reset_debug_uses (stmt);
 
       mark_virtual_ops_for_renaming (stmt);
       gsi_remove (&bsi, true);
@@ -2476,8 +2478,17 @@ tree_predictive_commoning_loop (struct loop *loop)
   datarefs = VEC_alloc (data_reference_p, heap, 10);
   dependences = VEC_alloc (ddr_p, heap, 10);
   loop_nest = VEC_alloc (loop_p, heap, 3);
-  compute_data_dependences_for_loop (loop, true, &loop_nest, &datarefs,
-                                    &dependences);
+  if (! compute_data_dependences_for_loop (loop, true, &loop_nest, &datarefs,
+                                          &dependences))
+    {
+      if (dump_file && (dump_flags & TDF_DETAILS))
+       fprintf (dump_file, "Cannot analyze data dependencies\n");
+      VEC_free (loop_p, heap, loop_nest);
+      free_data_refs (datarefs);
+      free_dependence_relations (dependences);
+      return false;
+    }
+
   if (dump_file && (dump_flags & TDF_DETAILS))
     dump_data_dependence_relations (dump_file, dependences);