re PR c++/44808 (ICE: tree check: expected var_decl, have result_decl in gimplify_modify_expr)

	PR c++/44808
	* gimplify.c (gimplify_modify_expr): Only SET_DECL_DEBUG_EXPR if
	*from_p is VAR_DECL.

	* g++.dg/opt/nrv16.C: New test.

From-SVN: r161838

gcc/ChangeLog

+2010-07-05  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/44808
+	* gimplify.c (gimplify_modify_expr): Only SET_DECL_DEBUG_EXPR if
+	*from_p is VAR_DECL.
+
 2010-07-05  Nathan Froyd  <froydnj@codesourcery.com>
 
 	* tree.h (build_call_list): Remove.

gcc/gimplify.c

@@ -4559,7 +4559,7 @@ gimplify_modify_expr (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p,
   /* Try to alleviate the effects of the gimplification creating artificial
      temporaries (see for example is_gimple_reg_rhs) on the debug info.  */
   if (!gimplify_ctxp->into_ssa
-      && DECL_P (*from_p)
+      && TREE_CODE (*from_p) == VAR_DECL
       && DECL_IGNORED_P (*from_p)
       && DECL_P (*to_p)
       && !DECL_IGNORED_P (*to_p))

gcc/testsuite/ChangeLog

+2010-07-05  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/44808
+	* g++.dg/opt/nrv16.C: New test.
+
 2010-07-05  Richard Guenther  <rguenther@suse.de>
 
 	PR tree-optimization/44784

gcc/testsuite/g++.dg/opt/nrv16.C

+// PR c++/44808
+// { dg-do compile }
+
+struct S
+{
+  void *a, *b;
+  int c;
+};
+
+S
+foo ()
+{
+  S x;
+  S y = x;
+  return x;
+}