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diff --git a/ghc/runtime/gmp/mpn_lshift.c b/ghc/runtime/gmp/mpn_lshift.c
deleted file mode 100644
index b89a736..0000000
--- a/ghc/runtime/gmp/mpn_lshift.c
+++ /dev/null
@@ -1,83 +0,0 @@
-/* mpn_lshift -- Shift left low level.
-
-Copyright (C) 1991 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 General Public License as published by
-the Free Software Foundation; either version 2, 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 General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with the GNU MP Library; see the file COPYING.  If not, write to
-the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
-
-#include "gmp.h"
-#include "gmp-impl.h"
-
-/* Shift U (pointed to by UP and USIZE digits long) CNT bits to the left
-   and store the USIZE least significant digits of the result at WP.
-   Return the bits shifted out from the most significant digit.
-
-   Argument constraints:
-   0. U must be normalized (i.e. it's most significant digit != 0).
-   1. 0 <= CNT < BITS_PER_MP_LIMB
-   2. If the result is to be written over the input, WP must be >= UP.
-*/
-
-mp_limb
-#ifdef __STDC__
-mpn_lshift (mp_ptr wp,
-	    mp_srcptr up, mp_size usize,
-	    unsigned cnt)
-#else
-mpn_lshift (wp, up, usize, cnt)
-     mp_ptr wp;
-     mp_srcptr up;
-     mp_size usize;
-     unsigned cnt;
-#endif
-{
-  mp_limb high_limb, low_limb;
-  unsigned sh_1, sh_2;
-  mp_size i;
-  mp_limb retval;
-
-  if (usize == 0)
-    return 0;
-
-  sh_1 = cnt;
-  if (sh_1 == 0)
-    {
-      if (wp != up)
-	{
-	  /* Copy from high end to low end, to allow specified input/output
-	     overlapping.  */
-	  for (i = usize - 1; i >= 0; i--)
-	    wp[i] = up[i];
-	}
-      return 0;
-    }
-
-  wp += 1;
-  sh_2 = BITS_PER_MP_LIMB - sh_1;
-  i = usize - 1;
-  low_limb = up[i];
-  retval = low_limb >> sh_2;
-  high_limb = low_limb;
-  while (--i >= 0)
-    {
-      low_limb = up[i];
-      wp[i] = (high_limb << sh_1) | (low_limb >> sh_2);
-      high_limb = low_limb;
-    }
-  wp[i] = high_limb << sh_1;
-
-  return retval;
-}