re PR debug/48768 (ICE in get_expr_operands())

	PR debug/48768
	* tree-ssa.c (insert_debug_temp_for_var_def): If degenerate_phi_result
	is error_mark_node, set value to NULL.

	* gcc.dg/pr48768.c: New test.

From-SVN: r172968

gcc/ChangeLog

 2011-04-26  Jakub Jelinek  <jakub@redhat.com>
 
+	PR debug/48768
+	* tree-ssa.c (insert_debug_temp_for_var_def): If degenerate_phi_result
+	is error_mark_node, set value to NULL.
+
 	PR tree-optimization/48734
 	* tree-ssa-reassoc.c (eliminate_redundant_comparison): Give up
 	if return value from maybe_fold_*_comparsions isn't something

gcc/testsuite/ChangeLog

 2011-04-26  Jakub Jelinek  <jakub@redhat.com>
 
+	PR debug/48768
+	* gcc.dg/pr48768.c: New test.
+
 	PR tree-optimization/48734
 	* gcc.c-torture/compile/pr48734.c: New test.
 

gcc/testsuite/gcc.dg/pr48768.c

+/* PR debug/48768 */
+/* { dg-do compile } */
+/* { dg-options "-O -fcompare-debug" } */
+
+int a, b;
+
+int
+bar (void)
+{
+  int i, j = 1;
+  for (i = 0; i != 10; i++)
+    {
+    lab:
+      if (i)
+	{
+	  int *k = &j;
+	}
+      else if (j)
+	goto lab;
+    }
+  return 1;
+}
+
+inline int
+foo (int x)
+{
+  unsigned int c = x;
+  int d = x;
+  if (bar ())
+    for (; c; c++)
+      while (x >= 0)
+	if (foo (d) >= 0)
+	  {
+	    d = bar ();
+	    a = b ? b : 1;
+	  }
+  return 0;
+}

gcc/tree-ssa.c

 /* Miscellaneous SSA utility functions.
-   Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010
+   Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011
    Free Software Foundation, Inc.
 
 This file is part of GCC.
@@ -352,6 +352,10 @@ insert_debug_temp_for_var_def (gimple_stmt_iterator *gsi, tree var)
       value = degenerate_phi_result (def_stmt);
       if (value && walk_tree (&value, find_released_ssa_name, NULL, NULL))
 	value = NULL;
+      /* error_mark_node is what fixup_noreturn_call changes PHI arguments
+	 to.  */
+      else if (value == error_mark_node)
+	value = NULL;
     }
   else if (is_gimple_assign (def_stmt))
     {