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diff --git a/gmp/tests/devel/shift.c b/gmp/tests/devel/shift.c
new file mode 100644
index 00000000..09a7e7f3
--- /dev/null
+++ b/gmp/tests/devel/shift.c
@@ -0,0 +1,208 @@
+/*
+Copyright 1996, 1998, 1999, 2000, 2001, 2004, 2007, 2009 Free Software
+Foundation, Inc.
+
+This file is part of the GNU MP Library.
+
+The GNU MP Library is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 3 of the License, or (at your
+option) any later version.
+
+The GNU MP Library is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.  */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include "gmp.h"
+#include "gmp-impl.h"
+#include "tests.h"
+
+#ifdef OPERATION_lshift
+#define func __gmpn_lshift
+#define reffunc refmpn_lshift
+#define funcname "mpn_lshift"
+#endif
+
+#ifdef OPERATION_rshift
+#define func __gmpn_rshift
+#define reffunc refmpn_rshift
+#define funcname "mpn_rshift"
+#endif
+
+#if defined (USG) || defined (__SVR4) || defined (_UNICOS) || defined (__hpux)
+#include <time.h>
+
+int
+cputime ()
+{
+  if (CLOCKS_PER_SEC < 100000)
+    return clock () * 1000 / CLOCKS_PER_SEC;
+  return clock () / (CLOCKS_PER_SEC / 1000);
+}
+#else
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+
+int
+cputime ()
+{
+  struct rusage rus;
+
+  getrusage (0, &rus);
+  return rus.ru_utime.tv_sec * 1000 + rus.ru_utime.tv_usec / 1000;
+}
+#endif
+
+static void mpn_print (mp_ptr, mp_size_t);
+
+#define M * 1000000
+
+#ifndef CLOCK
+#error "Don't know CLOCK of your machine"
+#endif
+
+#ifndef OPS
+#define OPS (CLOCK/5)
+#endif
+#ifndef SIZE
+#define SIZE 496
+#endif
+#ifndef TIMES
+#define TIMES OPS/(SIZE+1)
+#endif
+
+#ifndef CNT
+int CNT = 4;
+#endif
+
+int
+main (int argc, char **argv)
+{
+  mp_ptr s1, dx, dy;
+  mp_limb_t cyx, cyy;
+  int i;
+  long t0, t;
+  unsigned int test;
+  int cnt = CNT;
+  mp_size_t size;
+  unsigned int ntests;
+
+  s1 = malloc (SIZE * sizeof (mp_limb_t));
+  dx = malloc ((SIZE + 2) * sizeof (mp_limb_t));
+  dy = malloc ((SIZE + 2) * sizeof (mp_limb_t));
+
+  ntests = ~(unsigned) 0;
+  if (argc == 2)
+    ntests = strtol (argv[1], 0, 0);
+
+  for (test = 1; test <= ntests; test++)
+    {
+#if TIMES == 1 && ! defined (PRINT)
+      if (test % (SIZE > 100000 ? 1 : 100000 / SIZE) == 0)
+	{
+	  printf ("\r%u", test);
+	  fflush (stdout);
+	}
+#endif
+
+#if TIMES == 1
+      cnt = random () % (GMP_NUMB_BITS - 1) + 1;
+#endif
+
+#ifdef RANDOM
+      size = random () % SIZE + 1;
+#else
+      size = SIZE;
+#endif
+
+      dx[0] = 0x87654321;
+      dy[0] = 0x87654321;
+      dx[size+1] = 0x12345678;
+      dy[size+1] = 0x12345678;
+
+#if TIMES != 1
+      mpn_random (s1, size);
+
+      t0 = cputime();
+      for (i = 0; i < TIMES; i++)
+	func (dx+1, s1, size, cnt);
+      t = cputime() - t0;
+      printf (funcname ":    %5ldms (%.3f cycles/limb)\n",
+	      t, ((double) t * CLOCK) / (TIMES * size * 1000.0));
+#endif
+
+#ifndef NOCHECK
+      mpn_random (s1, size);
+
+#ifdef PRINT
+      printf ("cnt=%-*d ", (int) (2 * sizeof(mp_limb_t)) - 4, cnt);
+      mpn_print (s1, size);
+#endif
+
+      /* Put garbage in the destination.  */
+      for (i = 0; i < size; i++)
+	{
+	  dx[i+1] = 0xdead;
+	  dy[i+1] = 0xbeef;
+	}
+
+      cyx = reffunc (dx+1, s1, size, cnt);
+      cyy = func (dy+1, s1, size, cnt);
+
+#ifdef PRINT
+      mpn_print (&cyx, 1);
+      mpn_print (dx+1, size);
+      mpn_print (&cyy, 1);
+      mpn_print (dy+1, size);
+#endif
+
+      if (cyx != cyy || mpn_cmp (dx, dy, size+2) != 0
+	  || dx[0] != 0x87654321 || dx[size+1] != 0x12345678)
+	{
+#ifndef PRINT
+	  mpn_print (&cyx, 1);
+	  mpn_print (dx+1, size);
+	  mpn_print (&cyy, 1);
+	  mpn_print (dy+1, size);
+#endif
+	  printf ("\n");
+	  if (dy[0] != 0x87654321)
+	    printf ("clobbered at low end\n");
+	  if (dy[size+1] != 0x12345678)
+	    printf ("clobbered at high end\n");
+	  printf ("TEST NUMBER %u\n", test);
+	  abort();
+	}
+#endif
+    }
+  exit (0);
+}
+
+static void
+mpn_print (mp_ptr p, mp_size_t size)
+{
+  mp_size_t i;
+
+  for (i = size - 1; i >= 0; i--)
+    {
+#ifdef _LONG_LONG_LIMB
+      printf ("%0*lX%0*lX", (int) (sizeof(mp_limb_t)),
+	      (unsigned long) (p[i] >> (BITS_PER_MP_LIMB/2)),
+	      (int) (sizeof(mp_limb_t)), (unsigned long) (p[i]));
+#else
+      printf ("%0*lX", (int) (2 * sizeof(mp_limb_t)), p[i]);
+#endif
+#ifdef SPACE
+      if (i != 0)
+	printf (" ");
+#endif
+    }
+  puts ("");
+}