--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.c-torture/execute/pr84169.c	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,25 @@
+/* PR rtl-optimization/84169 */
+
+#ifdef __SIZEOF_INT128__
+typedef unsigned __int128 T;
+#else
+typedef unsigned long long T;
+#endif
+
+T b;
+
+static __attribute__ ((noipa)) T
+foo (T c, T d, T e, T f, T g, T h)
+{
+  __builtin_mul_overflow ((unsigned char) h, -16, &h);
+  return b + h;
+}
+
+int
+main ()
+{
+  T x = foo (0, 0, 0, 0, 0, 4);
+  if (x != -64)
+    __builtin_abort ();
+  return 0;
+}