diff --git a/gcc/testsuite/gcc.dg/bitint-83.c b/gcc/testsuite/gcc.dg/bitint-83.c
new file mode 100644
index 0000000000000000000000000000000000000000..96d3f713e889362e13079f886da23e2591ee6e39
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/bitint-83.c
@@ -0,0 +1,23 @@
+/* PR tree-optimization/113691 */
+/* { dg-do compile { target bitint } } */
+/* { dg-options "-O2 -std=gnu11 -w" } */
+
+#if __BITINT_MAXWIDTH__ >= 944
+_BitInt (944) i;
+#else
+_BitInt (63) i;
+#endif
+
+void foo ();
+
+void
+bar ()
+{
+  foo (i);
+}
+
+void
+foo (int *p)
+{
+  *p = 0;
+}