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diff --git a/gcc/rtlhooks.c b/gcc/rtlhooks.c
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+++ b/gcc/rtlhooks.c
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+/* Generic hooks for the RTL middle-end.
+   Copyright (C) 2004, 2005, 2007, 2008 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC 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 3, or (at your option) any later
+version.
+
+GCC 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 GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
+#include "rtl.h"
+#include "rtlhooks-def.h"
+#include "expr.h"
+#include "recog.h"
+
+
+/* For speed, we will copy the RTX hooks struct member-by-member
+   instead of doing indirect calls.  For these reason, we initialize
+   *two* struct rtl_hooks globals: rtl_hooks is the one that is used
+   to actually call the hooks, while general_rtl_hooks is used
+   to restore the hooks by passes that modify them.  */
+
+const struct rtl_hooks general_rtl_hooks = RTL_HOOKS_INITIALIZER;
+struct rtl_hooks rtl_hooks = RTL_HOOKS_INITIALIZER;
+
+rtx
+gen_lowpart_general (enum machine_mode mode, rtx x)
+{
+  rtx result = gen_lowpart_common (mode, x);
+
+  if (result)
+    return result;
+  /* Handle SUBREGs and hard REGs that were rejected by
+     simplify_gen_subreg.  */
+  else if (REG_P (x) || GET_CODE (x) == SUBREG)
+    {
+      result = gen_lowpart_common (mode, copy_to_reg (x));
+      gcc_assert (result != 0);
+      return result;
+    }
+  else
+    {
+      int offset = 0;
+
+      /* The only additional case we can do is MEM.  */
+      gcc_assert (MEM_P (x));
+
+      /* The following exposes the use of "x" to CSE.  */
+      if (GET_MODE_SIZE (GET_MODE (x)) <= UNITS_PER_WORD
+	  && SCALAR_INT_MODE_P (GET_MODE (x))
+	  && TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (mode),
+				    GET_MODE_BITSIZE (GET_MODE (x)))
+	  && !reload_completed)
+	return gen_lowpart_general (mode, force_reg (GET_MODE (x), x));
+
+      if (WORDS_BIG_ENDIAN)
+	offset = (MAX (GET_MODE_SIZE (GET_MODE (x)), UNITS_PER_WORD)
+		  - MAX (GET_MODE_SIZE (mode), UNITS_PER_WORD));
+
+      if (BYTES_BIG_ENDIAN)
+	/* Adjust the address so that the address-after-the-data
+	   is unchanged.  */
+	offset -= (MIN (UNITS_PER_WORD, GET_MODE_SIZE (mode))
+		   - MIN (UNITS_PER_WORD, GET_MODE_SIZE (GET_MODE (x))));
+
+      return adjust_address (x, mode, offset);
+    }
+}
+
+/* Similar to gen_lowpart, but cannot emit any instruction via
+   copy_to_reg or force_reg.  Mainly used in simplify-rtx.c.  */
+rtx
+gen_lowpart_no_emit_general (enum machine_mode mode, rtx x)
+{
+  rtx result = gen_lowpart_if_possible (mode, x);
+  if (result)
+    return result;
+  else
+    return x;
+}
+
+rtx
+reg_num_sign_bit_copies_general (const_rtx x ATTRIBUTE_UNUSED,
+				 enum machine_mode mode ATTRIBUTE_UNUSED,
+                                 const_rtx known_x ATTRIBUTE_UNUSED,
+				 enum machine_mode known_mode ATTRIBUTE_UNUSED,
+                                 unsigned int known_ret ATTRIBUTE_UNUSED,
+                                 unsigned int *result ATTRIBUTE_UNUSED)
+{
+  return NULL;
+}
+
+rtx
+reg_nonzero_bits_general (const_rtx x ATTRIBUTE_UNUSED,
+			  enum machine_mode mode ATTRIBUTE_UNUSED,
+			  const_rtx known_x ATTRIBUTE_UNUSED,
+                          enum machine_mode known_mode ATTRIBUTE_UNUSED,
+                          unsigned HOST_WIDE_INT known_ret ATTRIBUTE_UNUSED,
+                          unsigned HOST_WIDE_INT *nonzero ATTRIBUTE_UNUSED)
+{
+  return NULL;
+}
+
+bool
+reg_truncated_to_mode_general (enum machine_mode mode ATTRIBUTE_UNUSED,
+			       const_rtx x ATTRIBUTE_UNUSED)
+{
+  return false;
+}
+
+/* Assuming that X is an rtx (e.g., MEM, REG or SUBREG) for a fixed-point
+   number, return an rtx (MEM, SUBREG, or CONST_INT) that refers to the
+   least-significant part of X.
+   MODE specifies how big a part of X to return.
+
+   If the requested operation cannot be done, 0 is returned.
+
+   This is similar to gen_lowpart_general.  */
+
+rtx
+gen_lowpart_if_possible (enum machine_mode mode, rtx x)
+{
+  rtx result = gen_lowpart_common (mode, x);
+
+  if (result)
+    return result;
+  else if (MEM_P (x))
+    {
+      /* This is the only other case we handle.  */
+      int offset = 0;
+      rtx new_rtx;
+
+      if (WORDS_BIG_ENDIAN)
+	offset = (MAX (GET_MODE_SIZE (GET_MODE (x)), UNITS_PER_WORD)
+		  - MAX (GET_MODE_SIZE (mode), UNITS_PER_WORD));
+      if (BYTES_BIG_ENDIAN)
+	/* Adjust the address so that the address-after-the-data is
+	   unchanged.  */
+	offset -= (MIN (UNITS_PER_WORD, GET_MODE_SIZE (mode))
+		   - MIN (UNITS_PER_WORD, GET_MODE_SIZE (GET_MODE (x))));
+
+      new_rtx = adjust_address_nv (x, mode, offset);
+      if (! memory_address_p (mode, XEXP (new_rtx, 0)))
+	return 0;
+
+      return new_rtx;
+    }
+  else if (mode != GET_MODE (x) && GET_MODE (x) != VOIDmode
+	   && validate_subreg (mode, GET_MODE (x), x,
+			        subreg_lowpart_offset (mode, GET_MODE (x))))
+    return gen_lowpart_SUBREG (mode, x);
+  else
+    return 0;
+}
+