re PR ipa/77905 (ICE at -Os and above in both 32-bit and 64-bit modes on…

re PR ipa/77905 (ICE at -Os and above in both 32-bit and 64-bit modes on x86_64-linux-gnu (internal compiler error: in ipa_comdats, at ipa-comdats.c:352))

	PR ipa/77905
	* ipa-pure-const.c (cdtor_p): Return true for
	DECL_STATIC_{CON,DE}STRUCTOR even when it is
	DECL_LOOPING_CONST_OR_PURE_P.

	* g++.dg/ipa/pr77905.C: New test.

From-SVN: r243596

gcc/ChangeLog

+2016-12-13  Jakub Jelinek  <jakub@redhat.com>
+
+	PR ipa/77905
+	* ipa-pure-const.c (cdtor_p): Return true for
+	DECL_STATIC_{CON,DE}STRUCTOR even when it is
+	DECL_LOOPING_CONST_OR_PURE_P.
+
 2016-12-12  Jakub Jelinek  <jakub@redhat.com>
 
 	PR tree-optimization/78777

gcc/ipa-pure-const.c

@@ -1195,7 +1195,8 @@ static bool
 cdtor_p (cgraph_node *n, void *)
 {
   if (DECL_STATIC_CONSTRUCTOR (n->decl) || DECL_STATIC_DESTRUCTOR (n->decl))
-    return !TREE_READONLY (n->decl) && !DECL_PURE_P (n->decl);
+    return ((!TREE_READONLY (n->decl) && !DECL_PURE_P (n->decl))
+	    || DECL_LOOPING_CONST_OR_PURE_P (n->decl));
   return false;
 }
 

gcc/testsuite/ChangeLog

+2016-12-13  Jakub Jelinek  <jakub@redhat.com>
+
+	PR ipa/77905
+	* g++.dg/ipa/pr77905.C: New test.
+
 2016-12-12  Jakub Jelinek  <jakub@redhat.com>
 
 	PR tree-optimization/78777

gcc/testsuite/g++.dg/ipa/pr77905.C

+// PR ipa/77905
+// { dg-do compile }
+// { dg-options "-O2" }
+
+struct A {
+  A(int);
+};
+struct B : A {
+  B();
+} A;
+struct C : virtual A {
+  C(int);
+};
+A::A(int x) {
+  if (x)
+    A(0);
+}
+
+B::B() : A(1) {}
+
+C::C(int) : A(1) {}