diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 7deeca506dc..4e5c771ab27 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,12 @@
+2012-01-05  Richard Guenther  <rguenther@suse.de>
+
+	PR lto/50490
+	* tree-streamer-out.c (write_ts_optimization): New function.
+	(streamer_write_tree_body): Call it.
+	* tree-streamer-in.c (lto_input_ts_optimization): New function.
+	(streamer_read_tree_body): Call it.
+	* lto-streamer-out.c (lto_is_streamable): Handle OPTIMIZATION_NODE.
+
 2012-01-05  Jakub Jelinek  <jakub@redhat.com>
 
 	PR middle-end/51761
diff --git a/gcc/lto-streamer-out.c b/gcc/lto-streamer-out.c
index 4b3be3bb1ff..054bb85be0b 100644
--- a/gcc/lto-streamer-out.c
+++ b/gcc/lto-streamer-out.c
@@ -304,7 +304,6 @@ lto_is_streamable (tree expr)
 	 && code != WITH_CLEANUP_EXPR
 	 && code != STATEMENT_LIST
 	 && code != OMP_CLAUSE
-	 && code != OPTIMIZATION_NODE
 	 && (code == CASE_LABEL_EXPR
 	     || code == DECL_EXPR
 	     || TREE_CODE_CLASS (code) != tcc_statement);
diff --git a/gcc/tree-streamer-in.c b/gcc/tree-streamer-in.c
index 8a18a995b75..c7215105233 100644
--- a/gcc/tree-streamer-in.c
+++ b/gcc/tree-streamer-in.c
@@ -903,6 +903,23 @@ lto_input_ts_target_option (struct lto_input_block *ib, tree expr)
     fatal_error ("cl_target_option size mismatch in LTO reader and writer");
 }
 
+/* Input a TS_OPTIMIZATION tree from IB into EXPR.  */
+
+static void
+lto_input_ts_optimization (struct lto_input_block *ib, tree expr)
+{
+  unsigned i, len;
+  struct bitpack_d bp;
+  struct cl_optimization *t = TREE_OPTIMIZATION (expr);
+
+  bp = streamer_read_bitpack (ib);
+  len = sizeof (struct cl_optimization);
+  for (i = 0; i < len; i++)
+    ((unsigned char *)t)[i] = bp_unpack_value (&bp, 8);
+  if (bp_unpack_value (&bp, 32) != 0x12345678)
+    fatal_error ("cl_optimization size mismatch in LTO reader and writer");
+}
+
 /* Input a TS_TRANSLATION_UNIT_DECL tree from IB and DATA_IN into EXPR.  */
 
 static void
@@ -979,6 +996,9 @@ streamer_read_tree_body (struct lto_input_block *ib, struct data_in *data_in,
   if (CODE_CONTAINS_STRUCT (code, TS_TARGET_OPTION))
     lto_input_ts_target_option (ib, expr);
 
+  if (CODE_CONTAINS_STRUCT (code, TS_OPTIMIZATION))
+    lto_input_ts_optimization (ib, expr);
+
   if (CODE_CONTAINS_STRUCT (code, TS_TRANSLATION_UNIT_DECL))
     lto_input_ts_translation_unit_decl_tree_pointers (ib, data_in, expr);
 }
diff --git a/gcc/tree-streamer-out.c b/gcc/tree-streamer-out.c
index 17b5be78c7c..df8b92aa102 100644
--- a/gcc/tree-streamer-out.c
+++ b/gcc/tree-streamer-out.c
@@ -767,6 +767,27 @@ write_ts_target_option (struct output_block *ob, tree expr)
   streamer_write_bitpack (&bp);
 }
 
+/* Write a TS_OPTIMIZATION tree in EXPR to OB.  */
+
+static void
+write_ts_optimization (struct output_block *ob, tree expr)
+{
+  struct cl_optimization *t = TREE_OPTIMIZATION (expr);
+  struct bitpack_d bp;
+  unsigned i, len;
+
+  /* The cl_optimizaation is generated by the options
+     awk script, so we just recreate a byte-by-byte copy here. */
+
+  bp = bitpack_create (ob->main_stream);
+  len = sizeof (struct cl_optimization);
+  for (i = 0; i < len; i++)
+    bp_pack_value (&bp, ((unsigned char *)t)[i], 8);
+  /* Catch struct size mismatches between reader and writer. */
+  bp_pack_value (&bp, 0x12345678, 32);
+  streamer_write_bitpack (&bp);
+}
+
 /* Write a TS_TRANSLATION_UNIT_DECL tree in EXPR to OB.  */
 
 static void
@@ -841,6 +862,9 @@ streamer_write_tree_body (struct output_block *ob, tree expr, bool ref_p)
   if (CODE_CONTAINS_STRUCT (code, TS_TARGET_OPTION))
     write_ts_target_option (ob, expr);
 
+  if (CODE_CONTAINS_STRUCT (code, TS_OPTIMIZATION))
+    write_ts_optimization (ob, expr);
+
   if (CODE_CONTAINS_STRUCT (code, TS_TRANSLATION_UNIT_DECL))
     write_ts_translation_unit_decl_tree_pointers (ob, expr);
 }