--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/pr51821.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,25 @@
+/* { dg-do run } */
+/* { dg-options "-std=c99 -O2" } */
+/* { dg-additional-options "-msse" { target { i?86-*-* x86_64-*-* } } } */
+/* { dg-require-effective-target sse_runtime { target { i?86-*-* x86_64-*-* } } } */
+
+extern void abort (void);
+
+unsigned int  __attribute__((noinline))
+test (int shift_size)
+{
+  unsigned long long res = ~0;
+
+  return res << shift_size;
+}
+
+int
+main ()
+{
+  int dst = 32;
+
+  if (test (dst) != 0)
+    abort ();
+
+  return 0;
+}