lto-streamer-in.c (input_ssa_names): Do not allocate GIMPLE_NOP for all SSA names.

2016-04-22  Richard Biener  <rguenther@suse.de>

	* lto-streamer-in.c (input_ssa_names): Do not allocate
	GIMPLE_NOP for all SSA names.
	* lto-streamer-out.c (output_ssa_names): Do not output
	SSA names that should have been released.

From-SVN: r235360

gcc/ChangeLog

 2016-04-22  Richard Biener  <rguenther@suse.de>
 
+	* lto-streamer-in.c (input_ssa_names): Do not allocate
+	GIMPLE_NOP for all SSA names.
+	* lto-streamer-out.c (output_ssa_names): Do not output
+	SSA names that should have been released.
+
+2016-04-22  Richard Biener  <rguenther@suse.de>
+
 	PR tree-optimization/70740
 	* tree-ssa-phiprop.c (propagate_with_phi): Handle inserted
 	VDEF.

gcc/lto-streamer-in.c

@@ -881,10 +881,13 @@ input_ssa_names (struct lto_input_block *ib, struct data_in *data_in,
 
       is_default_def = (streamer_read_uchar (ib) != 0);
       name = stream_read_tree (ib, data_in);
-      ssa_name = make_ssa_name_fn (fn, name, gimple_build_nop ());
+      ssa_name = make_ssa_name_fn (fn, name, NULL);
 
       if (is_default_def)
-	set_ssa_default_def (cfun, SSA_NAME_VAR (ssa_name), ssa_name);
+	{
+	  set_ssa_default_def (cfun, SSA_NAME_VAR (ssa_name), ssa_name);
+	  SSA_NAME_DEF_STMT (ssa_name) = gimple_build_nop ();
+	}
 
       i = streamer_read_uhwi (ib);
     }

gcc/lto-streamer-out.c

@@ -1816,7 +1816,11 @@ output_ssa_names (struct output_block *ob, struct function *fn)
 
       if (ptr == NULL_TREE
 	  || SSA_NAME_IN_FREE_LIST (ptr)
-	  || virtual_operand_p (ptr))
+	  || virtual_operand_p (ptr)
+	  /* Simply skip unreleased SSA names.  */
+	  || (! SSA_NAME_IS_DEFAULT_DEF (ptr)
+	      && (! SSA_NAME_DEF_STMT (ptr)
+		  || ! gimple_bb (SSA_NAME_DEF_STMT (ptr)))))
 	continue;
 
       streamer_write_uhwi (ob, i);