--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/ipa/pr91956.C	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,27 @@
+/* { dg-do compile } */
+/* { dg-options "-Os -std=c++11 -fno-strict-aliasing -fno-tree-fre -fno-tree-vrp"  } */
+
+int count = 0;
+struct VB
+{
+  VB() {++count;}
+};
+
+struct B : virtual VB
+{
+  B() : B(42) {}
+  B(int)  {}
+};
+
+struct D : B
+{
+  D() {}
+  D(int) : D() {}
+};
+
+int main()
+{
+  D d{42};
+  if (count != 1)
+    __builtin_abort();
+}