--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/strcmpopt_9.c	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,34 @@
+/* PR tree-optimization/92683 - strncmp incorrect result with equal substrings
+   and nonconst bound
+   { dg-do run }
+   { dg-options "-O2 -Wall" } */
+
+#include "strlenopt.h"
+
+#define ident(n) ident (n)
+
+__attribute__ ((noclone, noinline, noipa)) size_t
+ident (size_t x)
+{
+  return x;
+}
+
+int nfails;
+
+__attribute__ ((noclone, noinline, noipa)) void
+failure_on_line (int line)
+{
+  __builtin_printf ("failure on line %i\n", line);
+  ++nfails;
+}
+
+#include "strcmpopt_8.c"
+
+int main (void)
+{
+  test_literal ();
+  test_cst_array ();
+
+  if (nfails)
+    __builtin_abort ();
+}