--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/hwint.c	Sun Aug 21 07:07:55 2011 +0900
@@ -0,0 +1,100 @@
+/* Operations on HOST_WIDE_INT.
+   Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
+   1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
+   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"
+
+#if GCC_VERSION < 3004
+
+/* The functions clz_hwi, ctz_hwi, ffs_hwi, floor_log2 and exact_log2
+   are defined as inline functions in hwint.h if GCC_VERSION >= 3004.
+   The definitions here are used for older versions of GCC and non-GCC
+   bootstrap compilers.  */
+
+/* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
+   If X is 0, return -1.  */
+
+int
+floor_log2 (unsigned HOST_WIDE_INT x)
+{
+  int t = 0;
+
+  if (x == 0)
+    return -1;
+
+  if (HOST_BITS_PER_WIDE_INT > 64)
+    if (x >= (unsigned HOST_WIDE_INT) 1 << (t + 64))
+      t += 64;
+  if (HOST_BITS_PER_WIDE_INT > 32)
+    if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 32))
+      t += 32;
+  if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 16))
+    t += 16;
+  if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 8))
+    t += 8;
+  if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 4))
+    t += 4;
+  if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 2))
+    t += 2;
+  if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 1))
+    t += 1;
+
+  return t;
+}
+
+/* Return the logarithm of X, base 2, considering X unsigned,
+   if X is a power of 2.  Otherwise, returns -1.  */
+
+int
+exact_log2 (unsigned HOST_WIDE_INT x)
+{
+  if (x != (x & -x))
+    return -1;
+  return floor_log2 (x);
+}
+
+/* Given X, an unsigned number, return the number of least significant bits
+   that are zero.  When X == 0, the result is the word size.  */
+
+int
+ctz_hwi (unsigned HOST_WIDE_INT x)
+{
+  return x ? floor_log2 (x & -x) : HOST_BITS_PER_WIDE_INT;
+}
+
+/* Similarly for most significant bits.  */
+
+int
+clz_hwi (unsigned HOST_WIDE_INT x)
+{
+  return HOST_BITS_PER_WIDE_INT - 1 - floor_log2(x);
+}
+
+/* Similar to ctz_hwi, except that the least significant bit is numbered
+   starting from 1, and X == 0 yields 0.  */
+
+int
+ffs_hwi (unsigned HOST_WIDE_INT x)
+{
+  return 1 + floor_log2 (x & -x);
+}
+
+#endif /* GCC_VERSION < 3004 */