[PATCH] Fix PR64059

[Markus Trippelsdorf <markus at trippelsdorf dot de>]

This fixes PR64059 where a call to get_dynamic_type wasn't guarded by
flag_devirtualize.

Tested on powerpc64-unknown-linux-gnu.
Preapproved by Honza on bugzilla. Commited to trunk.

	PR ipa/64059
	* ipa-prop.c (ipa_analyze_call_uses): Don't call get_dynamic_type when
	devirtualization is disabled.

	PR ipa/64059
	* g++.dg/ipa/pr64059.C: New test.

diff --git a/gcc/ipa-prop.c b/gcc/ipa-prop.c
index 2e0016bfbe66..eeffda449d9b 100644
--- a/gcc/ipa-prop.c
+++ b/gcc/ipa-prop.c
@@ -2155,7 +2155,7 @@ ipa_analyze_call_uses (struct func_body_info *fbi, gcall *call)
   if (cs && !cs->indirect_unknown_callee)
     return;
 
-  if (cs->indirect_info->polymorphic)
+  if (cs->indirect_info->polymorphic && flag_devirtualize)
     {
       tree instance;
       tree target = gimple_call_fn (call);
diff --git a/gcc/testsuite/g++.dg/ipa/pr64059.C b/gcc/testsuite/g++.dg/ipa/pr64059.C
new file mode 100644
index 000000000000..0269b45458d9
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ipa/pr64059.C
@@ -0,0 +1,56 @@
+// { dg-options "-r -nostdlib -O2 -flto -fno-devirtualize" }
+// { dg-require-effective-target lto }
+
+class A;
+class B
+{
+public:
+  A *operator->();
+};
+class C
+{
+public:
+  virtual void m_fn1 ();
+};
+class A
+{
+public:
+  C *m_fn2 ();
+};
+class D
+{
+public:
+  void
+  m_fn3 ()
+  {
+    list_m->m_fn2 ()->m_fn1 ();
+  }
+  B list_m;
+};
+
+class F
+{
+public:
+  D m_fn4 ();
+};
+class G
+{
+public:
+  F m_fn5 (int, int);
+};
+class H
+{
+public:
+  void
+  m_fn6 ()
+  {
+    fieldEngine_m.m_fn5 (0, 0).m_fn4 ().m_fn3 ();
+  }
+  G fieldEngine_m;
+};
+
+void
+fn1 (H a)
+{
+  a.m_fn6 ();
+}
-- 
2.1.3

-- 
Markus