https://bugs.gentoo.org/655518
https://gcc.gnu.org/PR85655

From 815f1bcb7b6e7d076317c15a31525fea1b53b0c0 Mon Sep 17 00:00:00 2001
From: jamborm <jamborm@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Fri, 11 May 2018 15:58:29 +0000
Subject: [PATCH] Check is_single_const in intersect_with_plats

2018-05-11  Martin Jambor  <mjambor@suse.cz>

	PR ipa/85655
	* ipa-cp.c (intersect_with_plats): Check that the lattice contains
	single const.

testsuite/
	* g++.dg/lto/pr85655_0.C: New test.



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-8-branch@260166 138bc75d-0d04-0410-961f-82ee72b054a4
diff --git a/gcc/ipa-cp.c b/gcc/ipa-cp.c
index 4f28a55b862..e868b9c2623 100644
--- a/gcc/ipa-cp.c
+++ b/gcc/ipa-cp.c
@@ -4127,7 +4127,9 @@ intersect_with_plats (struct ipcp_param_lattices *plats,
 	  if (aglat->offset - offset == item->offset)
 	    {
 	      gcc_checking_assert (item->value);
-	      if (values_equal_for_ipcp_p (item->value, aglat->values->value))
+	      if (aglat->is_single_const ()
+		  && values_equal_for_ipcp_p (item->value,
+					      aglat->values->value))
 		found = true;
 	      break;
 	    }