Add function part to a same comdat group (PR ipa/80212).

2017-04-07  Martin Liska  <mliska@suse.cz>

	PR ipa/80212
	* g++.dg/ipa/pr80212.C: New test.
2017-04-07  Martin Liska  <mliska@suse.cz>

	PR ipa/80212
	* ipa-split.c (split_function): Add function part to a same comdat
	group.

From-SVN: r246759

gcc/ChangeLog

+2017-04-07  Martin Liska  <mliska@suse.cz>
+
+	PR ipa/80212
+	* ipa-split.c (split_function): Add function part to a same comdat
+	group.
+
 2017-04-07  Richard Biener  <rguenther@suse.de>
 
 	PR middle-end/80341

gcc/ipa-split.c

@@ -1363,6 +1363,9 @@ split_function (basic_block return_bb, struct split_point *split_point,
   /* Let's take a time profile for splitted function.  */
   node->tp_first_run = cur_node->tp_first_run + 1;
 
+  if (cur_node->same_comdat_group)
+    node->add_to_same_comdat_group (cur_node);
+
   /* For usual cloning it is enough to clear builtin only when signature
      changes.  For partial inlining we however can not expect the part
      of builtin implementation to have same semantic as the whole.  */

gcc/testsuite/ChangeLog

+2017-04-07  Martin Liska  <mliska@suse.cz>
+
+	PR ipa/80212
+	* g++.dg/ipa/pr80212.C: New test.
+
 2017-04-07  Thomas Preud'homme  <thomas.preudhomme@arm.com>
 
 	* gcc.dg/tree-ssa/pr79800.c: Require c99_runtime.

gcc/testsuite/g++.dg/ipa/pr80212.C

+// PR ipa/80212
+// { dg-options "-O2 --param partial-inlining-entry-probability=403796683 -fno-early-inlining" }
+
+struct b
+{
+  virtual b *c () const;
+};
+struct d : virtual b
+{
+};
+struct e : d
+{
+  e *
+  c () const
+  {
+  }
+};
+main () { e a; }