--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/pr89435.c	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,21 @@
+/* PR rtl-optimization/89435 */
+/* { dg-do run } */
+/* { dg-options "-O1 -fno-forward-propagate -fno-tree-forwprop -fno-tree-ccp" } */
+
+unsigned short a;
+unsigned int b, c, d, e, f;
+
+int
+main ()
+{
+#if __CHAR_BIT__ == 8 && __SIZEOF_INT__ == 4
+  unsigned char g = e = __builtin_mul_overflow_p (5, 542624702, 0);
+  d = __builtin_bswap64 (a);
+  b = __builtin_sub_overflow ((unsigned char) -e, (unsigned int) d, &g);
+  e = __builtin_mul_overflow (b, c, &a);
+  f = g + e;
+  if (f != 0xff)
+    __builtin_abort ();
+#endif
+  return 0;
+}