re PR tree-optimization/49000 (ICE: verify_ssa failed with -O2 -g)

	PR tree-optimization/49000
	* tree-ssa.c (execute_update_addresses_taken): Call
	maybe_rewrite_mem_ref_base on debug stmt value.  If it couldn't
	be rewritten and decl has been marked for renaming, reset
	the debug stmt.

	* gcc.dg/pr49000.c: New test.

From-SVN: r173849

gcc/ChangeLog

+2011-05-18  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/49000
+	* tree-ssa.c (execute_update_addresses_taken): Call
+	maybe_rewrite_mem_ref_base on debug stmt value.  If it couldn't
+	be rewritten and decl has been marked for renaming, reset
+	the debug stmt.
+
 2011-05-17  Joseph Myers  <joseph@codesourcery.com>
 	* config/i386/i386.c (ix86_valid_target_attribute_tree): Use

gcc/testsuite/ChangeLog

+2011-05-18  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/49000
+	* gcc.dg/pr49000.c: New test.
+
 2011-05-17  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* gnat.dg/invalid1.adb: New test.

gcc/testsuite/gcc.dg/pr49000.c

+/* PR tree-optimization/49000 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -g" } */
+
+static
+foo (int x, int y)
+{
+  return x * y;
+}
+
+static int
+bar (int *z)
+{
+  return *z;
+}
+
+void
+baz (void)
+{
+  int a = 42;
+  int *b = &a;
+  foo (bar (&a), 3);
+}
+
+void
+test (void)
+{
+  baz ();
+}

gcc/tree-ssa.c

@@ -2230,6 +2230,17 @@ execute_update_addresses_taken (void)
 		  }
 	      }
 
+	    else if (gimple_debug_bind_p (stmt)
+		     && gimple_debug_bind_has_value_p (stmt))
+	      {
+		tree *valuep = gimple_debug_bind_get_value_ptr (stmt);
+		tree decl;
+		maybe_rewrite_mem_ref_base (valuep);
+		decl = non_rewritable_mem_ref_base (*valuep);
+		if (decl && symbol_marked_for_renaming (decl))
+		  gimple_debug_bind_reset_value (stmt);
+	      }
+
 	    if (gimple_references_memory_p (stmt)
 		|| is_gimple_debug (stmt))
 	      update_stmt (stmt);